Actuator motor, automatic air conditioning, task - GF83.40-P-2182-01T
General determinations on actuator motor and flap controls
Continuous positioning of the flaps.
So that the actuator motors do not run continuously in the control range, the following release function is implemented in the automatic air conditioning system for every flap.
Clearance function: Once a position has been set, the specified blower air temperature for example must change sufficiently by the next change for the clearance value above or below it to be undershot or overshot.
Final values are approached directly (0 %, 100 %).
Anti-fogging function
The anti-fogging function prevents the windshield and side windows from becoming fogged up after starting the engine thanks to the fact that moist air is not guided directly against the windows after starting, but instead into the footwell of the vehicle.
Solar roof function (on model 211.0 with code (419) solar module for panoramic roof)
The actuator motors are driven to the following position after 2 minutes and outside temperatures greater 10°C:
- center nozzle 100 % open
- activated charcoal filter flap OFF (fresh air)
Afterwards the AAC control and operating module (N22) shuts down.
For
- automatic and manual flap operation
- with ignition OFF or REST OFF or stationary heater OFF the following procedure applies:
The actuator motors are driven into the following positions after 2 minutes:
- footwell flaps open
- defroster flaps closed
- recirculated air flap closed
- center air outlet stops in the last valid setting.
For
Ignition ON: up to 30 seconds after engine ON
REST ON: 60 seconds starting with the request
Stationary heater ON: 60 seconds starting with the request
the following procedure applies:
- footwell flaps open
- defroster flaps closed
- center nozzle automatic according to specification
- recirculated air flap immediately operable (including automatic recirculated air)
After these times have elapsed, the flap states for the automatic or manual setting apply
Center outlet flap actuator motor (M2/22)
The center outlet flap actuator motor (M2/22) actuates the air flaps for controlling the air flow to the center nozzles.
Depending upon the desired air outlet temperature at the center nozzle, the center outlet flap actuator motor (M2/22) is actuated via the AAC control and operating module (N22) and the AC bus.
Actuation at "defrost" footwell flaps 0 % (closed)
Actuation with "REST" according to regulation
Actuation with stationary heater as per the control (if fitted)
Actuation at "0" previous position retained
Actuation with ignition OFF previous position retained
Automatic air flap control
Depending upon the following variables the air flaps are opened up to 100 % by the center outlet flap actuator motor (M2/22) in line with a defined characteristic.
- Blend air flap position
- Coolant temperature
- Evaporator temperature
- Footwell flap position
Air flap control via the center nozzle
In manual mode the air flap settings are determined by the selector on the center nozzle.
Blending air flap actuator motor left (M2/6) and blending air flap actuator motor right (M2/7)
The left (M2/6) and right (M2/7) blending air flap actuator motors are used to adjust the ventilation temperature of the heating and air conditioning system.
The left (M2/6) and right (M2/7) blending air flap actuator motors are actuated via the AAC control and operating module (N22) and the AC bus depending upon the position of the temperature selector wheels and the effective interior temperature in line with defined characteristics and move the blend air flaps. The flaps open or close the passage of air through the heating heat exchanger to mix, heated, fresh or cooled air in the correct proportion required to achieve the desired interior temperature. The specified flap angles of the blending air flaps are determined by the ACC control and operating module (N22) as a function of the following information:
- selected specified temperature at the temperature selector wheel
- measured interior temperature at the in-car temperature sensors (B10/4, N70b1)
- Coolant temperature
blending air flaps closed no air through the mixing chamber and thus no heating of the air.
blending air flap open - all air flows through the mixing chamber with maximum heating of air.
Defroster vent flap actuator motors left and right (M2/16)
The defroster vent flap actuator motor on the left and right (M2/16) operates the defroster vent flaps to actuate the air flow to the windshield defroster nozzle and side window defroster nozzles. By pressing the window defrost switch (N22s3) on the AAC [KLA] control and operating unit (N22) the defroster vent flap actuator motor on the left and right (M2/16) is actuated via the AC bus and operates the defroster vent flaps.
With "defrosting" and "0" the defroster nozzle flaps are 100% open.
Manual flap control
(12 o'clock partitioning through actuation of air distributor duct button)
| 1 o'clock | 2 o'clock | 3 o'clock | 4 o'clock | 5 o'clock | 6 o'clock |
| 100% | 100% | 100% | 67% | 21% | 0% |
| 7 o'clock | 8 o'clock | 9 o'clock | 10 o'clock | 11 o'clock | 12 o'clock |
| 0% | 0% | 0% | 23% | 65% | 100% |
Automatic flap control
The defroster vent flaps are opened depending on the following values
- Blend air flap position
- Coolant temperature
- Evaporator temperature
- Relative humidity
linear up to 100 % open.
Footwell flap actuator motors left and right (M2/15)
The left and right footwell flaps actuator motor (M2/15) actuates the footwell flaps to regulate the air flow to the front footwell and rear footwell.
By operating the air distribution buttons of the AAC control and operating module (N22) the left and right footwell flap actuator motor (M2/15) is actuated via the AC bus and thus controls the footwell flaps, which assume the following positions for the various requirements:
Actuation at "defrost" footwell flaps 0 % (closed)
actuation at "REST" in accordance with regulation
actuation at "0" no change
Manual flap control
(12 o'clock partitioning through actuation of air distributor duct button)
| 1 o'clock | 2 o'clock | 3 o'clock | 4 o'clock | 5 o'clock | 6 o'clock |
| 29% | 72% | 100% | 100% | 100% | 100% |
| 7 o'clock | 8 o'clock | 9 o'clock | 10 o'clock | 11 o'clock | 12 o'clock |
| 54% | 30% | 0% | 0% | 0% | 0% |
Automatic footwell flap control
The footwell flaps are opened depending on the following values
- Blend air flap position
- Coolant temperature
- Evaporator temperature
linear up to 100 % open.
Fresh air and recirculated air flap actuator motor (M2/5)
The fresh air flap/recirculated air flap actuator motor (M2/5) is used to close or open the fresh air supply by operating the fresh air flaps and recirculated air flaps.
By pressing the recirculated air switch (N22s2) on the AAC [KLA] control and operating unit (N22) the fresh air flaps and recirculated air flaps actuator motor (M2/5) is actuated via the AC bus.
In recirculation mode, the recirculation flap is open and the fresh air flap is closed. Air is drawn into the AC housing from the vehicle interior by the blower.
In fresh air mode, the fresh air flap is open and the recirculation flap is closed. Fresh air is drawn into the automatic air conditioning housing by the blower.
When the recirculated air switch (N22s2) is operated manually the system goes into 100% recirculated air mode for a limited time. This is displayed by the function LED. Time limit function:
- after 30 minutes with outside temperature above approx. 7°C,
- after 5 minutes with outside temperature below approx. 7°C,
- after 5 minutes with AC OFF.
After ignition ON, a non-recurring 100 % automatic recirculated air is possible for 30 minutes. After expiry of this period the system switches to 80 % recirculated air or fresh air, depending upon the conditions.
If automatic recirculated air is required after engine ON, fresh air will be circulated initially for 30 seconds. Following this then 80 % automatic recirculated air is actuated and 10 seconds later as required then switches to 100 % automatic recirculated air.
Tunnel function
Activation of the tunnel function:
Only possible where the recirculated air LED is not illuminated. pressing the recirculated air switch (N22s2) for more than 1.5 s Reaction: fresh air and recirculated air flaps are driven into recirculated air position. Now the 4 windows and the tilting/sliding roof are closed in a staggered manner.
If the recirculated air-LED is extinguished manually or by the automatic timer, the fresh air and recirculated air flap moves to the fresh air position, however, the windows and the sliding roof remain closed.
Deactivation of tunnel function:
Only possible where the recirculated air LED is illuminated. pressing the recirculated air switch (N22s2) for more than 1.5 s Reaction: fresh air and recirculated air flaps are driven into fresh air position. Now the 4 windows and the tilting/sliding roof are opened in a staggered manner.
If the recirculated air LED is reset manually (operating the recirculated air switch (N22s2) for less than 1.5 seconds), then only the fresh air flap and recirculated air flap is moved into the recirculated air position
Special functions of the fresh air/recirculated air control:
- In the AC OFF function no automatic and no pollutant gas-controlled recirculated air is possible.
- Only fresh air mode is possible in the defrosting function.
- 100% recirculated air applies in the "0" function
- Manual recirculated air is deleted after ignition OFF.
- No manual or automatic recirculated air is possible in the rest function.