Functional Scope Of Engine, PSM, Function - GF54.21-D-3007TSB
Model 907
with code ED5 (Parameterisable special module)
Working speed control
Engine functions
Engine speed control function
The parameterizable special module (PSM) control unit (N26/15) enables functions in the Common Rail Direct Injection (CDI) control unit or the ME gasoline injection and ignition system (ME) control unit to be influenced.
To do so, the parameterizable function module "Engine speed control" has been implemented which ensures that the CDI control unit or the ME-SFI [ME] control unit is operated correctly.
It is possible to set a specified value for engine speed, maximum engine speed, maximum engine torque and maximum vehicle speed via the engine speed control module. These functions are distributed across various sub-modules (see picture below). If a function is not required, it can be deactivated via the associated sub-module.
However, it is generally necessary to parameterize several sub-modules in order to map a function such as working speed control, for example. The individual modules for engine speed control are shown in the picture below.
Function "Working speed control"
The actual speed of the engine can be regulated via the working speed control function.
On the one hand, several fixed RPM values can be specified and, on the other hand, the RPM can also be freely adjusted via push button.
For safety reasons, the working speed control function can only be used on a stationary vehicle with the parking brake applied.
Engine speed regulation
The input and output parameters are described in general in the overview picture. A detailed description of the inputs and outputs of the module including possible settings is available in the respective sub-module.
The PSM control unit can activate output of engine speed limits, torque limits and vehicle speed limits (GB) through inputs or body manufacturer CAN signals.
The following conditions must be fulfilled for this function:
- The correct function module for the limitation is active.
- Circuit 15 ON
- Working speed control not active
If these conditions are fulfilled, it is possible to activate the output of limit values via the inputs of the respective module.
Working speed control enables the body manufacturer (ABH) to adjust the engine speed.
- Use of a cruise control switch to increase, reduce or resume RPM
- Use of the body manufacturer CAN for direct specification of the engine speed
- Use of the body manufacturer CAN to increase, reduce or resume the engine speed
The working speed controls ensure that sudden changes in RPM or exceeding the parameterized minimum and maximum RPM are not possible. In the event of a fault, the system attempts to set the lowest possible engine speed (idle speed) or to completely deactivate working speed control.
With working speed control, the following input conditions can be parameterized for internal function enable:
- Parameterization of internal inputs via menu items: "Special functions → Engine speed control → Working speed control, input"
- Requirement for enabling of working speed control:
Transmission in neutral position
- Requirement for enabling of working speed control: Freely parameterizable CAN signal
- Request for function "Working speed control" via an input
- Request of "Working speed control" function through the body manufacturer CAN
- Requirement for enabling of working speed control:
- Parameterization of module via menu items: "Special functions → Engine speed control → Working speed control, properties":
- Activate function "Working speed control"
- Request for function "Working speed control" via power take-off
- Requirement for enabling of working speed control: Engine at idle
- Requirement for enabling of working speed control: Clutch
- Freely parameterizable CAN signal: threshold value
- Freely parameterizable CAN signal: Evaluation of threshold value
- Freely parameterizable CAN signal: Inversion (with bit signals only)
- Waiting time until enabling of function
- Waiting time after operation of clutch pedal
- Limitation of minimum engine speed via function "Working speed control"
- Limitation of maximum engine speed via the "Working speed control" function
- Limitation of maximum engine torque via function "Working speed control"
- Maximum speed in working speed control mode
- Accelerator pedal lock
The following conditions are always checked to enable the function "Working speed control" i.e. these conditions are fixed:
- Parking brake "OPERATED".
- Brake "OPERATED".
- Circuit 15 "ON"
- Power supply in normal range
If these conditions are fulfilled, an input or the body manufacturer CAN can be used to activate the internal function enable.
If the internal function enable has been activated, the engine speed specification in the PSM control unit can be output and changed. The possibilities for changing the engine speed are listed below in the order corresponding to their priority (fixed speed, hand throttle actuator, increase, reduction or resumption).
"RPM limitation" function
The PSM control unit can activate output of engine speed limits, torque limits and vehicle speed limits (GB) through inputs or body manufacturer CAN signals.
The following conditions must be fulfilled for this function:
- The correct function module for the limitation is active.
- Circuit 15 "ON"
- Working speed control not active
If these conditions are fulfilled, it is possible to activate the output of limit values via the inputs of the respective module.
"Fixed speed" function
Inputs or the body manufacturer CAN can be used to issue 3 different fixed speeds. Each fixed speed can be assigned a run-on time of up to 25.5 s. If a fixed speed is selected, it is approached using a ramp. If no fixed speed is selected then the lower RPM limit of the working speed control is approached with a ramp when none of the other RPM changes is active.
Hand throttle actuator
The hand-throttle actuator can be operated either via an analog input (input 07 or 08) of the PSM control unit or via the body manufacturer CAN (signal 0x3023 (requested engine speed for working speed control)). In both cases, the engine speed is bounded by the parameterized limits (minimum and maximum) of the hand throttle actuator.
To activate the hand throttle actuator, the accelerator pedal module must be in a rest position and the engine speed must be in a stable condition.
When using an analog input, it is possible to switch the hand throttle actuator on and off via input "Value for hand throttle actuator via analog/digital converter".
When the hand throttle actuator is activated, a ramp is initially used to approach the set engine speed. When this engine speed has been reached, the changes made at the hand throttle actuator are forwarded directly.
Use commercially available hand throttle actuators, like those used for Mercedes-Benz trucks. Use a high-side output of the PSM control unit as a power supply for this hand throttle actuator. Failure to do so may result in severe fluctuations in engine speed.
"RPM change" function
This operating mode has the lowest priority and can therefore only be used when neither the fixed speed nor the hand throttle actuator are active.
The input sources are either the Cruise control switch, inputs on the PSM control unit or signals from the body manufacturer CAN. The functions are "Increase RPM", "Reduce RPM" and "Resume RPM".
The RPM changes know 2 operating modes, the step mode and the ramp mode.
In the stage mode, the engine speed is reduced or increased by the parameterized stage height each time an input is actuated. If the input remains actuated, the system changes to ramp mode. A ramp with the parameterized ramp slope is then output. This ramp stops either when an engine speed limit is reached or when actuation of the input is canceled.
If the "Hand throttle actuator" or "Fixed speed" function is activated, then it is not possible to switch between stepped and ramp speed.
The RPM resume functions similar to a cruise control. If this input is actuated, a previously stored engine speed is approached again. This is done using a ramp.
The engine speed is stored each time an input used for increasing or reducing the engine speed (in stage or ramp mode) is actuated. If working speed control is deactivated and reactivated, the current engine speed is adopted as the new start value. Actuating the resumption function sets the original engine speed again.
The value for resume is only stored until the PSM control unit changes to rest mode (e.g. if the vehicle is parked for a longer period).
As long as it is "circuit 15 ON" the value is stored.
Parameters for "Working speed control" function
Request for function "Working speed control" via an input
Request for activation of working speed control. An event entry is made if an unfulfilled condition for activation of working speed control is detected when this input is actuated. The freeze frame data for the event contains the information indicating which conditions are not yet fulfilled.
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request of "Working speed control" function through the body manufacturer CAN
Request over body manufacturer CAN for activation of working speed control. The "B18319A" event is set with its freeze frame data as for the request through an input.
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for function "Working speed control" via power take-off
Request of power take-off for activation of working speed control.
| Request for working speed control, power take-off function module (signal ID 0x1443) | The request of the "Power take-off function" is taken into account for activation of working speed control. |
|---|---|
| Query DEACTIVATED (signal ID 0x30BE). | Query of this condition deactivated |
Brake
Activation input (Bit signal) as condition for activation of working speed control.
| Brake light OPERATED (signal ID 0x107F). | Query of brake for activation of working speed control |
|---|---|
| Continuous low (signal ID 0x1000) | Query of this condition deactivated |
Parking brake
Querying of this condition cannot be deactivated.
Activation input (bit signal) as condition for enabling working speed control.
| Parking brake OPERATED (signal ID 0x1450). | Query of parking brake for activation of working speed control |
Requirement for enabling of working speed control: Transmission in neutral position, with transmission 722.9
The availability of the signal depends on the vehicle equipment.
Activation input (Bit signal) as condition for working speed control.
| Selector lever in position "N" (signal ID 0x10F2) | Query of neutral position for activation of working speed control |
|---|---|
| Query DEACTIVATED (signal ID 0x30BE). | Query of this condition deactivated |
Requirement for enabling of working speed control: Engine at idle
Activation input (Bit signal) as condition for working speed control.
| Engine at idle (signal ID 0x12C7) | Query of engine idle for activation of working speed control |
|---|---|
| Query DEACTIVATED (signal ID 0x30BE). | Query of this condition deactivated |
Requirement for enabling of working speed control: Clutch
The availability of the signal "Clutch pedal fully depressed" depends on the vehicle equipment.
Activation input (Bit signal) as condition for working speed control.
| Clutch pedal OPERATED (signal ID 0x1388). | Query whether clutch pedal is slightly depressed for activation of working speed control |
|---|---|
| Clutch pedal FULLY DEPRESSED (signal ID 0x1389) | Query whether clutch pedal is fully depressed for activation of working speed control |
| Query DEACTIVATED (signal ID 0x30BE). | Query of this condition deactivated |
The transmission neutral position switch is installed on vehicles with at least one of the following equipment codes:
- With code B25 (Electric parking brake)
- With code E07 (Hill-Start Assist)
- With code GE9 (6-speed manual transmission)
- With CODE MJ8 (ECO start/stop function)
- With code M53 (Constant RPM control)
- With CODE MS1 (CRUISE CONTROL)
- With code MT4 (Variable electronic RPM governor)
- With code MW1 (Engine run-on control)
Requirement for enabling of working speed control: Freely parameterizable CAN signal
Activation input as condition for working speed control.
The procedure is as follows:
- Signal = Any signal
- Type of signal = Bit or other signal
- Type of evaluation:
- With bit signal = Signal inverted or non-inverted
- With other signals = Threshold and whether signal to be over or below threshold.
Parameterization possibilities:
| Any signal | Any signal can be used here. |
|---|---|
| Query DEACTIVATED (signal ID 0x30BE). | Query of this condition deactivated |
Further parameters for freely parameterizable CAN signal "working speed control"
These must be parameterized in the working speed control properties:
- Threshold (value range = 0 to 65 535)
- Threshold evaluation, selection = Value must be higher or lower than threshold.
- Invert (only with bit signals), selection = "Yes" or "No"
Waiting time after operation of clutch pedal
The status of the clutch must be in the parameterized state (DEPRESSED/FULLY DEPRESSED) for the parameterized period so that the function "Working speed control" is enabled.
If the parameter "Waiting time after "Clutch depressed"" is set to 0, checking of the clutch status is deactivated in the function module "Working speed control".
Waiting time until enabling of function
After all other input conditions have been fulfilled, the time which is stored in the parameter "Waiting time until enabling of function" must expire in order for this condition to be regarded as fulfilled in the function module "Working speed control". If the parameter "Waiting time until enabling of function" is set to 0, checking of this waiting time is deactivated in the function module "Working speed control".
Further parameters for working speed control:
- Maximum engine speed
- Maximum engine torque
- Maximum vehicle speed
Parameters for "RPM change" function
Request for function "Engine speed increase" via an input
Request for RPM increase from input (bit signal) for RPM increase in RPM change function module.
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request of "Increase engine RPM" function over body manufacturer CAN
Activation input (bit signal) for RPM resumption in function module "Change of engine speed".
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for function "Engine speed reduction" via an input
Activation input (bit signal) for the RPM reduction in the RPM change function module.
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request of "Engine RPM reduction" function over body manufacturer CAN
Activation input (bit signal) for the RPM reduction in the RPM change function module.
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for function "Resume engine speed" via an input
Activation input (bit signal) for RPM resumption in function module "Change of engine speed".
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for "Resume engine speed" function over body manufacturer CAN
Activation input (bit signal) for RPM resumption in function module "Change of engine speed".
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Further parameters for changing engine speed
The following parameters are available for changing engine speed:
- Ramp slope (in ramp mode)
- Value range = 0 to 255 RPM per second
- Jump height (in stage mode)
- Value range = 0 to 255 RPM
- Switchover time from stage to ramp mode
- Value range = 0 to 25.5 s, in 100 ms steps
Request for "Maximum engine speed 1" function over an input
Activation input (bit signal) for selection of maximum RPM limitation 1.
Triggers output of "Maximum engine speed 1" parameter or output of limit set 1 (for parameterization of "Output of limits without working speed control" function) at the output of the RPM limitation function module. Limit set 1 consists of the following parameters:
- "Maximum engine speed 1" (RPM limitation without working speed control)
- "Maximum design speed 1" (RPM limitation without working speed control)
- "Maximum engine torque 1" (RPM limitation without working speed control)
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for "Maximum engine speed 2" function over an input
Activation input (bit signal) for selection of maximum RPM limitation 2.
Triggers output of "Maximum engine speed 2" parameter or output of limit set 2 (for parameterization of "Output of limits without working speed control" function) at the output of the RPM limitation function module. Limit set 2 consists of the following parameters:
- "Maximum engine speed 2" (RPM limitation without working speed control)
- "Maximum design speed 2" (RPM limitation without working speed control)
- "Maximum engine torque 2" (RPM limitation without working speed control)
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for "Maximum engine speed 3" function over an input
Activation input (bit signal) for selection of maximum RPM limitation 3.
Triggers output of "Maximum engine speed 3" parameter or output of limit set 3 (for parameterization of "Output of limits without working speed control" function) at the output of the RPM limitation function module. Limit set 3 consists of the following parameters:
- "Maximum engine speed 3" (RPM limitation without working speed control)
- "Design-dependent maximum speed 3" (RPM limitation without working speed control)
- "Maximum engine torque 3" (RPM limitation without working speed control)
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for "Maximum engine speed 1" function over the body manufacturer CAN
Activation input (bit signal) for selection of maximum RPM limitation 1.
Triggers output of "Maximum engine speed 1" parameter or output of limit set 1 (for parameterization of "Output of limits without working speed control" function) at the output of the RPM limitation function module. Limit set 1 consists of the following parameters:
- "Maximum engine speed 1" (RPM limitation without working speed control)
- "Maximum design speed 1" (RPM limitation without working speed control)
- "Maximum engine torque 1" (RPM limitation without working speed control)
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for "Maximum engine speed 2" function over the body manufacturer CAN
Activation input (bit signal) for selection of maximum RPM limitation 2.
Triggers output of "Maximum engine speed 2" parameter or output of limit set 2 (for parameterization of "Output of limits without working speed control" function) at the output of the RPM limitation function module.
Limit set 2 consists of the following parameters:
- "Maximum engine speed 2" (RPM limitation without working speed control)
- "Maximum design speed 2" (RPM limitation without working speed control)
- "Maximum engine torque 2" (RPM limitation without working speed control)
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for "Maximum engine speed 3" function over the body manufacturer CAN
Activation input (bit signal) for selection of maximum RPM limit 3.
Triggers output of "Maximum engine speed 3" parameter or output of limit set 3 (for parameterization of "Output of limits without working speed control" function) at the output of the RPM limitation function module. Limit set 3 consists of the following parameters:
- "Maximum engine speed 3" (RPM limitation without working speed control)
- "Design-dependent maximum speed 3" (RPM limitation without working speed control)
- "Maximum engine torque 3" (RPM limitation without working speed control)
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Enabling of functions "Fixed speed" and "RPM limitation" by an input
Activation input (bit signal) for engine speed enable in function module "Fixed speed" and "RPM limitation".
The enabling of "Fixed speed" and "RPM change" functions must be set by an input or by enabling the "Fixed speed" and "RPM limit" functions through the body manufacturer CAN, so that activation of a fixed sped or an RPM limitation (or a limit value set) is possible. It must be possible to apply a logical 1 at one of these inputs either by means of optional bit information in the signal pool or by parameterization to "Continuous high" (signal ID 0x1001).
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Enabling of functions "Fixed speed" and "RPM limitation" by body manufacturer CAN
Activation input (bit signal) for RPM enable in "Fixed speed" and "RPM limitation".
The enabling of "Fixed speed" and "RPM change" functions must be set by an input or by enabling the "Fixed speed" and "RPM limit" functions through the body manufacturer CAN, so that activation of a fixed sped or an RPM limitation (or a limit value set) is possible. It must be possible to apply a logical "1" at one of these inputs either by means of optional bit information in the signal pool or parameterization to "Continuous high" (signal ID 0x1001).
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Further parameters for RPM limitation
The following additional parameters are also available for RPM limitation:
- Minimal engine speed and maximum engine speed 1 to 3 (RPM limitation without working speed control)
- Maximum engine torque 1 to 3 (RPM limitation without working speed control)
- Design-dependent maximum speed 1 to 3 (RPM limitation without working speed control)
Parameters for "Fixed speed" function
Request for "Fixed speed 1" function over an input
Activation input (bit signal) for selection of fixed speed 1. Triggers output of the parameter "Output of fixed speed 1" at the output of the function module "Fixed speed".
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for function "Fixed speed 2" over an input
Activation input (bit signal) for selection of fixed speed 2. Triggers output of the parameter "Output of fixed speed 2" at the output of the function module "Fixed speed".
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for function "Fixed speed 3" via an input
Activation input (bit signal) for selection of fixed speed 3. Triggers output of the parameter "Output of fixed speed 3" at the output of the function module "Fixed speed".
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for "Fixed speed 1" function over the body manufacturer CAN
Activation input (bit signal) for selection of fixed speed 1. Triggers output of the parameter "Output of fixed speed 1" at the output of the function module "Fixed speed".
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for "Fixed speed 2" function over the body manufacturer CAN
Activation input (bit signal) for selection of fixed speed 2. Triggers output of the parameter "Output of fixed speed 2" at the output of the function module "Fixed speed".
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Request for "Fixed speed 3" function over the body manufacturer CAN
Activation input (bit signal) for selection of fixed speed 3. Triggers output of the parameter "Output of fixed speed 3" at the output of the function module "Fixed speed".
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Enabling of functions "Fixed speed" and "RPM limitation" by an input
Activation input (bit signal) for engine speed enable in function module "Fixed speed" and "RPM limitation".
Enabling of the "Fixed speed" and "RPM limitation" functions by an input or enabling of the "Fixed speed" and "RPM limitation" functions by the body manufacturer CAN must be set so that activation of a fixed speed or an RPM limitation (or a limit set) is possible. It must be possible to apply a logical "1" at one of these inputs either by means of optional bit information in the signal pool or parameterization to "Continuous high" (signal ID 0x1001).
| Any signal | Any signal can be used here. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Enabling of functions "Fixed speed" and "RPM limitation" by body manufacturer CAN
Activation input (bit signal) for engine speed enable in function module "Fixed speed" and "RPM limitation".
Enabling of the "Fixed speed" and "RPM limitation" functions by an input or enabling of the "Fixed speed" and "RPM limitation" functions by the body manufacturer CAN must be set so that activation of a fixed speed or an RPM limitation (or a limit set) is possible. It must be possible to apply a logical "1" at one of these inputs either by means of optional bit information in the signal pool or parameterization to "Continuous high" (signal ID 0x1001).
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Continuous low (signal ID 0x1000) | Function deactivated |
Waiting time after operation of clutch pedal
Depending on the parameterization, the clutch status must be "clutch depressed" or "clutch fully depressed" and this must be the case for the period of time which is stored in the parameter "waiting time after operation of clutch pedal". This condition is thus fulfilled in the function module "Fixed speed" and "RPM limitation".
If the waiting time is set to "0", checking of the clutch status is deactivated in the function module "Fixed speed" and "RPM limitation".
Waiting time until enabling of function
After all other input conditions have been fulfilled, the time which is stored in the parameter "Waiting time until enabling of function" must expire in order for this condition to be regarded as fulfilled in the function module "Fixed speed" and "RPM limitation".
If the waiting time is set to "0", checking of this waiting time is deactivated in the function module "Fixed speed" and "RPM limitation".
Further parameters for "Fixed speed" function
The following additional parameters are also available for fixed speed:
- Output of fixed speed 1 to 3
- Switch-off delay 1 to 3
Parameters for "Hand throttle actuator" function Value for hand throttle actuator via analog/digital converter
Depending on the parameterization of this output, the function module "Hand throttle actuator" uses (active) or does not use (inactive) the results of input 07 or 08 for calculating the hand throttle actuator speed.
It is possible to use an arbitrary signal for the activation. For example, you could use an input so that it would then be possible to deactivate the hand throttle actuator.
| Continuous high (signal ID 0x1001) | Hand throttle actuator activated over analog/digital converter |
|---|---|
| Continuous low (signal ID 0x1000) | Hand throttle actuator deactivated over analog/digital converter |
Value for hand throttle actuator over body manufacturer CAN
16-bit value from body manufacturer CAN. The function module "Hand throttle actuator" uses this to calculate the hand throttle actuator speed specification. The value is interpreted as the desired engine speed.
Valid range = 0 to 65 535, resolution RPM.
| Any signal from body manufacturer CAN | Any signal from the body manufacturer CAN can be used. |
|---|---|
| Query DEACTIVATED (signal ID 0x30BE). | Function deactivated |
Further parameters for "Hand throttle actuator" function
The following additional parameters are also available for the hand throttle actuator:
- Maximum and minimum engine speed via hand throttle actuator
- Selection of analog input for hand throttle actuator, selection option = Input 07 or 08
Signals of function working speed control which are stored in the signal pool
Enabling of working speed control
This bit signal is used as an enable signal for further "working speed control" function modules. It is set by the function module "Working speed control".
This signal is set when the inputs of the function module "Working speed control" are valid, the times for the function enable and the clutch waiting time have elapsed and one of the working speed control requests (input, body manufacturer CAN, power take-off) is active. The request to activate the working speed control is forwarded over the interior CAN (CAN B).
Specified value of RPM (module "RPM change")
This 16-bit value is calculated by the RPM change function module and it is the specification for the speed forwarded over the interior CAN (CAN B). This engine speed is bounded by the current RPM limits and is calculated using the inputs at the function module "Change of engine speed".
This value is valid, when the inputs of the function module RPM change and the signal "Enabling of working speed control" is active.
Current maximum RPM limit (module "RPM limitation")
This 16-bit value is selected by the function module RPM limitation based on the parameterization for the maximum RPM from the inputs. If more than one input is active at the same time, the lowest maximum engine speed is selected in each case.
This value is determined depending on the status of the bit signals "Enabling of working speed control" and "Request for working speed control ("Power take-off" module)" based on the following parameters:
- Limitation of maximum engine speed via the "Working speed control" function
- Limitation of maximum engine speed via the "Power take-off" function
This value is valid if the inputs of the function module "RPM limitation" are valid and the signal "Enabling of fixed speed" is active.
Current minimum RPM limit (module "RPM limitation")
This 16-bit value is selected by the function module RPM limitation based on the parameterization for the minimum RPM. If more than one input is active at the same time, the highest minimum engine speed is selected in each case.
This value is determined depending on the status of the bit signals "Enabling of working speed control" and "Request for working speed control ("Power take-off" module)" based on the following parameters:
- Limitation of minimum engine RPM over "Working speed control" function
- Limitation of minimum engine RPM over "Power take-off" function
This value is valid if the inputs of the function module "RPM limitation" are valid and the signal "Enabling of fixed speed" is active.
Current maximum torque (module "RPM limitation")
This 16-bit value is selected by the function module RPM limitation based on the parameterization for the maximum torques. If more than one input is active at the same time, the lowest torque is selected in each case.
This value is determined depending on the status of the bit signals "Enabling of working speed control" and "Request for working speed control ("Power take-off" module)" based on the following parameters:
- Limitation of maximum engine torque over "Working speed control" function
- Limitation of maximum engine torque over "Power take-off" function
This value is valid if the inputs of the function module "RPM limitation" are valid and the signal "Enabling of fixed speed" is active.
Current maximum speed (module "RPM limitation")
This 8-bit value is selected from the function module "RPM limitation" based on the parameterization for the maximum vehicle speed. If more than one input is active at the same time, the lowest vehicle speed is selected in each case.
This value is determined depending on the status of the bit signals "Enabling of working speed control" and "Request for working speed control ("Power take-off" module)" based on the following parameters:
- Maximum speed in working speed control mode
- Limitation of maximum speed over "Power take-off" function
This value is valid if the inputs of the function module "RPM limitation" are valid and the signal "Enabling of fixed speed" is active.
Specified value of RPM (module "Fixed speed")
This 16-bit value is selected by the function module fixed speed based on the parameterization for the fixed speed from the inputs.
This value is valid if the inputs of the function module "RPM limitation" are valid and the signal "Enabling of fixed speed" is active.
Enabling of fixed speed
This bit signal is used as an enable signal for further "working speed control" function modules. It is set by the function module "Fixed speed" and "RPM limitation".
This signal is set if the inputs of the function module "Fixed speed" are valid, the times for the function enable and the clutch waiting time have expired and either the "Enabling of working speed control" signal or the "Request for working speed control (module "Power take-off")" signal is active.
Specified value of RPM (module "Hand throttle actuator")
This 16-bit value is calculated by the function module hand throttle actuator from the inputs. The RPM is converted on a linear basis between the parameterizable limits "Minimum engine speed via the hand-throttle actuator" and "Maximum engine speed via the hand-throttle actuator".
This value is valid if the inputs of the function module "RPM limitation" are valid and the signal "Enabling of fixed speed" is active.
Ramp mode "ACTIVE" (otherwise pulse mode)
This bit signal is used by the function module "Change of engine speed" in order to switch from stage mode to ramp mode. For this purpose, the function module "Pulse and ramp mode" evaluates the actuation duration of the inputs for change of engine speed and sets this signal as soon as the actuation duration exceeds the time stored in the parameter "Ramp switchover time (stage or ramp mode)".
This value is valid if the inputs of the function module "RPM limitation" are valid and the signal "Enabling of fixed speed" is active.
Description of associated function modules for working speed control enable and accelerator pedal lock
Function module "Change of engine speed"
Function module "RPM limitation"
Function module "Fixed speed"
Function module enabling of fixed speed and RPM limitation
Function module "Hand throttle actuator"
Function module "Stage and ramp mode"
| Overview of system components for parameterizable special module (PSM) | GF54.21-D-9998TSA |