General - Vehicles without code (ZX2) EPB II
a - System pressureb - Brake pressurec - Redundant brake pressure
The Telligent brake system is an electronically monitored and electrically controlled pneumatic brake system. The Telligent brake system consists of a purely pneumatic dual- circuit brake system, which is actuated by the electric brake control. The electric brake control overlays the conventional, purely pneumatically operating control of the service brake and adds to it the following functions:
- Antilock brake system (ABS)
- Acceleration Slip Regulation (ASR)
- Automatic load-dependent brake pressure control (ALB)
- Hill holder
- Brake Assist System
The stability control (SR) function can be integrated in the Telligent brake system as an option. When a trailer or semitrailer is attached, the Telligent brake system is also responsible for controlling the trailer brake system. The pneumatic and electrical control capabilities of the trailer brake mean that trailers or semitrailers with purely pneumatic or electropneumatic brake system can be connected without problem.
The individual regulation of brake pressure for the wheel brakes on the front and rear axles forms the basis for all the functions of the Telligent brake system. The brake circuits of the front axle, the rear axle and the trailer or semitrailer are each safeguarded by a pneumatic safety circuit referred to as the redundancy circuit.
In the event of partial or total failure of the electric brake control, the wheel brakes are actuated with the relevant redundant brake pressure (c) by purely pneumatic means.
Electrically regulated brake application
The travel of the brake pedal is registered by two sensors in the brake value sensor (13.07) and is converted into electrical values for the brake system (BS) control unit (A11). The brake control (BS) control unit (A11) uses the values to compute the specified deceleration and the brake pressure (b) required for this. The brake pressure (b) necessary for producing the specified deceleration is transmitted over the brakes CAN (CAN 6) by control commands from the brake control (BS) control unit (A11) to the drive axle axle modulator (31.08 or 31.13). The electronics in the brake control (BS) control unit (A11) regulate the brake pressure (b) at the front axle and the electronics in the drive axle axle modulator (31.08 or 31.13) regulate the brake pressure (b) at the rear axle.
The calculated brake pressure (b) is applied at the front axle via the proportioning relay valve (16.07) and at the rear axle direct by the drive axle axle modulator (31.08 or 31.13). The pressure sensors in the proportioning relay valve (16.07) and in the drive axle axle modulator (31.08 or 31.13) monitor the applied brake pressure (b).
At the same time, the brake control (BS) control unit (A11) uses the signals from the rpm sensors (B30, B31, B32, B33) on the axles to calculate the rate of rpm change at the wheels. The brake control (BS) control unit (A11) uses the rpm change to detect the actuati deceleration of the vehicle and the wheel slip.
If there is a difference between the actual deceleration and the specified deceleration, braking is adjusted by an appropriate control command.
- Differential slip control
Differential slip control replaces the conventional ALB function. Differential slip control starts at moderate wheel speed differences.
- ABS control
If one or more wheels shows a tendency to lock up when high rpm differences occur, the brake system (BS) control unit (A11) triggers the familiar ABS control.
- ASR control
If one or more of the drive wheels shows a tendency to spin when high rpm differences occur, the brake system (BS) control unit (A11) triggers the familiar ASR control.
A3 - Drive control (FR) control unit
A6 - Engine control (MR) control unit
A7 - Base module (GM)
A11 - Telligent brake system (BS) control unit
A28 - Drive axle axle modulator
A64 - Front module (FM)
A65 - Rear module (HM)
A68 - Master switch module 4
A77 - Dash support switch module 1
B30 - Left front axle rpm sensor
B31 - Right front axle rpm sensor
B32 - Left 1 st rear axle rpm sensor
B33 - Right 1st rear axle rpm sensor
B36 - Left 1 st front axle brake wear sensor
B37 - Right 1st front axle brake wear sensor
B40 - Left 1 st rear axle brake wear sensor
B41 - Right 1st rear axle brake wear sensor
P2 - Instrument (INS)
S40 - ASR shutoff switch
S41 - Hill holder switch
CAN 1 - Vehicle CAN
CAN 2 - Interior CAN
CAN 3 - Frame CAN
CAN 6 - Brakes CAN
Materi terkait :
No comments:
Post a Comment