Trip Computer, Function - GF54.30-P-3044LF

Model 217, 222 

Function requirements in general 

• Tml. 15 ON:

  The electronic ignition lock control unit (N73) transmits the status of circuit 15 via the user interface CAN (CAN HMI) to the instrument cluster (A1).

Trip computer (TRIP) function, general 

The trip computer provides data and information on average fuel consumption, trip time, average speed, travel distance and remaining range.

The trip computer provides the following display screens:

• "After start" (short-distance memory)
• "After reset" (long-distance memory)
• "Present consumption"

The information displayed refers to the point in time of the last reset of the short-distance memory ("After start") or of the long-distance memory ("After reset").

The "After start" or "After reset" information is shown on the instrument cluster as follows:

• Distance traveled
• Time elapsed
• Average consumption
• Average transportation speed

The TRIP computer includes the following subfunctions:

• Display of travel distance function sequence 
• Function sequence for the time display 
• Function sequence for the average speed display 
• Function sequence for display of present consumption (except engine 157, 279) and composite mileage 
• Function sequence for ECO display (driving style analysis) (except engine 157, 279) 
• Function sequence for remaining distance display 
• Function sequence for resetting values 
• Function sequence for energy flow display (model 222.004/057/104/157/163/173) 

Display of travel distance function sequence 

The travel distance is calculated on the basis of the wheel speeds. The Electronic Stability Program control unit (N30/4) transmits the information about the wheel speeds via the chassis FlexRay (Flex E), the electronic ignition lock control unit and the user interface CAN to the instrument cluster. The instrument cluster calculates the traveled distance from the wheel speeds. The "After start" travel distance is shown in a range from 0 to 9, 999 km.

If a period of more than t = 4 h lies between the time when circuit 15 is switched off and then switched on again, then the "After start" odometer is automatically reset to "0".

Distance units are changed in the "settings" menu in the "instrument cluster" submenu. The distance unit can be changed from kilometers to miles in the "speedometer/travel distance display unit" display window. The "After reset" travel distance is calculated as for the "After start" travel distance, although the "After reset" travel distance is shown in a range of 0 to 99, 999 km.

Depending on the setting in the instrument cluster and coding of the national version of the instrument cluster, the travel distance is displayed in:

• Kilometers (e.g Economic Commission for Europe (ECE), Japan)
• Miles, (e.g. USA, Australia)

When kilometers are switched over to miles, liters are switched over to gallons automatically.

Function sequence for the time display 

The time from "After start" is added up using a time counter. The "After start" time is shown in a range of 0 to 999 h and 59 min.

The "After reset" time is determined as for the "After start" time, although the "After reset" time is shown in a range from 0 to 9, 999 h and 59 min.

Function sequence for the average speed display 

The trip computer calculates the average speed from the ratio between the travel distance driven and the time passed (trip time) since the last reset of the short-distance memory or long-distance memory. The travel distance is calculated in the instrument cluster from the wheel speeds.

The Electronic Stability Program control unit sends information on the wheel speeds over the suspension FlexRay, electronic ignition lock control unit and the user interface CAN to the instrument cluster.

Depending on the setting (kilometers/miles) and the national variant coding of the instrument cluster the average speed is displayed in:

• km/h (kilometers per hour)
• mph (miles per hour)

Function sequence for display of present consumption (except engine 157, 279) and composite mileage 

The CDI control unit (N3/9) (diesel engine) or the ME-SFI [ME] control unit (N3/10) (gasoline engine) sends the consumption signal over the engine CAN (CAN C), powertrain control unit (N127), chassis FlexRay, electronic ignition lock control unit and the user interface CAN to the instrument cluster.

Depending on the setting (kilometers/miles) and the national variant coding of the instrument cluster the fuel consumption is displayed in:

• l/100 km (liters per 100 kilometers)
• mpg (miles per gallon) or
• km/l (kilometers per liter)

The present consumption is displayed together with the range. The display is shown in the form of a bar display.

Function sequence for ECO display (driving style analysis) (except engine 157, 279) 

The "ECO Score" display graphically displays the individual handling characteristics in the form of a bar graph.

The following information is displayed:

• Acceleration characteristic
• Constant driving and coasting
• The mean value of the disciplines yields the overall score

The data required for evaluation purposes are sent by the CDI control unit or the ME-SFI [ME] control unit over the engine CAN, powertrain control unit, chassis FlexRay, electronic ignition lock control unit and the user interface CAN to the instrument cluster.

Function sequence for remaining distance display 

The trip computer determines the expected range from the ratio between the current tank capacity and the average fuel consumption.

The current tank capacity is recorded by the left fuel tank fuel level indicator fill level sensor (B4/1) and the right fuel tank fuel level indicator fill level sensor (B4/2). The fuel system control unit (N118) reads in the signals of the fuel tank fill level sensors directly, uses them to determine the fill level and sends this over the drive train CAN (CAN C1), powertrain control unit, chassis FlexRay, electronic ignition lock control unit and the user interface CAN to the instrument cluster.

Function sequence for resetting values 

The trip is reset in the "Reset values" menu by pressing on the instrument cluster finger navigation pad (S163/1s10) in the instrument cluster multifunction steering wheel button group (S163/1) (as of 01.06.2017 (model 222) or 01.12.2017 (model 217)), press the O.K. button (S110s6) in the left multifunction steering wheel button group (S110) (up to 31.05.2017 (model 222) or 30.11.2017 (model 217)). Here, the reset is only carried out for the currently displayed information.

The request is read in by the steering wheel electronics (N135) and transmitted to the steering column tube module control unit (N80) via the steering wheel CAN (as of 01.06.2017 (model 222) or 01.12.2017 (model 217)) or via the steering LIN (LIN E1) (up to 31.05.2017 (model 222) or 30.11.2017 (model 217)). The steering column tube module control unit sends this request via chassis FlexRay, the electronic ignition lock control unit and user interface CAN to the instrument cluster.

Function sequence for energy flow display (model 222.004/057/104/157/163/173) 

Shown here is the energy flow for "Charging at vehicle standstill" 

Courtesy of MERCEDES-BENZ USA

The percentage next to the battery symbol shows the current charge level of the high-voltage battery (A100g1).

The power flow display in the instrument cluster indicates whether the high-voltage battery is being charged or whether it is delivering energy. The battery management system control unit (N82/2) reads in the high-voltage battery data required for the display and sends these to the instrument cluster via the hybrid CAN (CAN L), powertrain control unit, suspension FlexRay, electronic ignition lock control unit and user interface CAN.

A comprehensive description of the energy flow display is available in a separate document.

	Electrical function schematic, instrument cluster trip computer		PE54.30-P-2057-97SEA
	Overview of system components, instrument cluster (IC) component description	Model 217, 222 up to model year 2018	GF54.30-P-9996LF
		Model 217, 222 as of model year 2018	GF54.30-P-9996LFM