Model: E65 - 745i
Production Date: 11/2001
Principle Of Operation
EDC-K is a microprocessor controlled damper adjusting system. The system consists of mechanical, hydraulic and electrical/electronic subsystems. Acceleration sensors record the driving/road surface conditions and the control module receives the sensor frequency signals for evaluation. The sensor signals are compared with each other for plausibility. The control module logic activates the damper valves according to internal programmed maps to dampen body and wheel movement as needed.
The driver can use the Controller and Control Display menu to select between comfort and sports programs. The system is diagnosable with the DISplus. In the event of sensor faults, the system is switched to a "safe state" by supplying fixed power to the damper valves. In the event of a system failure (no power), the dampers are mechanically sprung to the firmest setting.
The EDC-K function is divided into 3 blocks
- Control Module
- Sensors and program selection option
- Actuators - 4 electronically adjustable dampers
The input signals for the system are generated by
| Sensor/Switch | Signal | Calculated Variable | Location |
|---|---|---|---|
| Acceleration sensors front axle, rear axle | Vertical acceleration front, rear | Vertical velocity, Compression/rebound travel | Sprint-strut dome FR, FL, RR |
| Steering angle sensor | Steering angle | Steering angle velocity | SZL |
| Wheel speed sensors FL/FR | Wheel speed | Driving speed, acceleration/braking | Wheel hubs FL/FR |
| Program selection | Comfort/sports program | Controller |
INPUT SIGNALS
In addition to the forces calculated in each measured movement, there are vertical, longitudinal, transversal, copy and tolerance control logic.
Scheme 1
Controller And Control Display Operation
Sports program: The driver can activate/deactivate the sports program by the Controller in the Control Display menu.
A firmer damping is set when the EDC-K request is set to "SPORT". EDC-K always reverts back to the comfort program each time the engine is restarted.
