Audi Q7 e-tron quattro 4M - Page 47

47
Reference
For more information about the shift schematic, the valves and the mechatronic module, refer to Self Study Programmes
457 "AudiA8’10 Power Transmission" and 603 "AudiA6Avant’12".
Pressure control valves N215, N216, N217, N218, N233, N371 and N433
Pressure control valves, also known as EPC (electric pressure
control valve), convert a control current to a hydraulic control
pressure. They are activated by the gearbox control unit and
control the hydraulic valves (slide valves) belonging to the shift
elements (brakes and clutches).
There are two types of pressure control valve:
• Pressure control valves with rising pressure curve
• Pressure control valves with falling pressure curve
Pressure control valves with rising pressure curve
Pressure range [bar] 0–4,7
Operating voltage [V] 12
Resistance at 20°C [Ω] 5,05
• Automatic gearbox pressure control valve 1 N215 –brake A
• Automatic gearbox pressure control valve 2 N216 –brake B
• Automatic gearbox pressure control valve 4 N218–clutch D
• Automatic gearbox pressure control valve 5 N233–clutch E
• Automatic gearbox pressure control valve 6 N371–converter
lockup clutch
Pressure control valves with falling pressure curve
Pressure range [bar] 4,7–0
Operating voltage [V] 12
Resistance at 20°C [Ω] 5,05
• Automatic gearbox pressure control valve 3 N217–clutch C
• Automatic gearbox pressure control valve 7 N443–system
pressure
Solenoid valve N88 open/closed
Solenoid valve N88 controls the parking lock valve. The parking
lock valve controls the system pressure to the parking lock slide
valve (refer to SSP457, page 48).
Parking lock solenoid N486
The parking lock solenoid N486 is for holding the parking lock slide
valve in position "parking lock disengaged" (refer to SSP457,
page48).
649_086
649_087
If the valves with a falling pressure curve are energised, the control
pressure decreases with the control current. The activated clutch C
is opened. The system pressure is reduced. When the valves are
de-energised, clutch C is closed and the system is at maximum
pressure.
If the valves with a falling pressure curve are energised, the control
pressure decreases with the control current. The activated shift
elements (brakes and clutches) are closed. In the de-energised
state, the valves of the shift elements are open, i.e. not engaged to
transmit power.
Operating voltage in V up to 16
Pickup voltage in V >6
(valve closed)
Dropout voltage in V <5
(valve open)
Resistance at 20 °C in Ω 9–13
Operating voltage in V up to 16
Pickup voltage in V >8
(hold parking lock
slide valve)
Resistance at 20 °C in Ω 23–27
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