Order of execution
1. When the front wheel rotates at the beginning of the movement, the speed sensors will learn about this by a different value of the wheel speed.
2. The combined ABS and EDS control unit actuates the disc brake on the spinning wheel. This is done by an additional pair of solenoid valves in the ABS hydraulic module. The ABS opens the connection from the pressure manifold to the appropriate disc brake wheel cylinder until the wheel is braked enough that the other front wheel can transmit power.
3. As soon as the same slip conditions occur on both wheels, the control unit completes the adjustment process and closes the solenoid valves. The driver does not need to intervene, he notices the differential lock only by changing the nature of the noise.
4. To avoid failure, the EDS is controlled by an interlock circuit. Based on the brake pressure and also after a set maximum period of time, the EDS is switched off to avoid overloading the brakes. Above 40 km/h, EDS is always switched off. Solenoid valve circuits are designed so that the front brakes cannot work without control.
5. If the control unit detects a malfunction in the EDS, then the EDS is switched off. The anti-lock system continues to function. In all cases, Audi is ready to brake at any time.
6. The fault memory device works in the same way as described in the ABS section.
Visitor comments