Location
On semitrailer trucks the Electronic Air-Processing Unit is located on the inside of the left longitudinal frame member, near the fuel tank.
6.21 | Electronic Air-Processing Unit (EAPU) (mid) |
6.22 | Electronic Air-Processing Unit (EAPU), (high) |
W42.60-A003-11
Task
The Electronic Air-Processing Unit has the following tasks:
Regulation of cut-in and shutoff phases of the pressure regulator
Cleaning and drying of compressed air
Actuation and release of parking brake according to driver request
Distribution of compressed air delivered by the compressor to brake circuits and auxiliary consumer circuits
Maintaining the reservoir pressures of all compressed air circuits at the specified level
Protection of the intact compressed air circuits against a possible defective compressed air circuit
Regulation of compressed air desiccant cartridge regeneration
Version of EC control function
Actuation of pipe rupture protection solenoid valve (Y162) (on vehicles with code B0A (Pipe rupture protection, for brake system))
Reading in of control signal from parking brake lever control unit (A157) over the EAPU-LIN (LIN 10)
W42.60-A004-09
Body on vehicles with code B1H (Electronic air-processing unit and control system, medium) |
1 | Parking brake solenoid valve group | A18 y1 | Pre-control solenoid valve | 26 | Compressed air release (transmission control and clutch operation supply) | ||
2 | Pressure sensor relay valve actuation | A18 y2 | Regeneration solenoid valve | 27 | Compressed air release (air suspension) | ||
3 | Parking brake pressure sensor | 11 | Compressed air supply (from compressor) | 28 | Compressed air release (tire inflation connection) | ||
6.21 | Electronic Air-Processing Unit (EAPU) (mid) | 12 | Compressed air supply (external filling) | 31 | Ventilation for muffler connection | ||
A18 | Electronic Air Processing Unit (EAPU) control unit | 13 | Compressed air supply (external filling) | 32 | Relay valve ventilation | ||
A18 b1 | RA brake circuit pressure sensor | 21 | Compressed air release (rear axle brake circuit supply) | 51 | Compressed air release (compressor control connection) | ||
A18 b2 | FA brake circuit pressure sensor | 22 | Compressed air release (front axle brake circuit supply) | 52 | Compressed air release (parking brake on rear axle) | ||
A18 b6 | Transmission control/automatic clutch operation pressure sensor | 23 | Compressed air release (trailer control) | 53 | Compressed air release (parking brake on front axle with code B2Z (Parking brake, additionally on front axle)) | ||
A18 r1 | Heating element | 24 | Compressed air release (ancillary consumers) | 54 | Compressed air release (trailer control valve control connection) |
W42.60-A008-09
Body on vehicles with code B1I (Electronic compressed-air supply and control system, high) |
1 | Parking brake solenoid valve group | A18 y1 | Pre-control solenoid valve | 26 | Compressed air release (transmission control and clutch operation supply) | ||
2 | Pressure sensor relay valve actuation | A18 y2 | Regeneration solenoid valve | 27 | Compressed air release (air suspension) | ||
3 | Parking brake pressure sensor | 11 | Compressed air supply (from compressor) | 28 | Compressed air release (tire inflation connection) | ||
6.22 | Electronic Air-Processing Unit (EAPU), (high) | 12 | Compressed air supply (external filling) | 31 | Ventilation for muffler connection | ||
A18 | Electronic Air Processing Unit (EAPU) control unit | 13 | Compressed air supply (external filling) | 32 | Relay valve ventilation | ||
A18 b1 | RA brake circuit pressure sensor | 21 | Compressed air release (rear axle brake circuit supply) | 51 | Compressed air release (compressor control connection) | ||
A18 b2 | FA brake circuit pressure sensor | 22 | Compressed air release (front axle brake circuit supply) | 52 | Compressed air release (parking brake on rear axle) | ||
A18 b6 | Transmission control/automatic clutch operation pressure sensor | 23 | Compressed air release (trailer control) | 53 | Compressed air release (parking brake on front axle with code B2Z (Parking brake, additionally on front axle)) | ||
A18 b7 | Air suspension pressure sensor | 24 | Compressed air release (ancillary consumers) | 54 | Compressed air release (trailer control valve control connection) | ||
A18 r1 | Heating element |