Quote:
Originally Posted by marconi118
Still hoping someone could help me  |
From the E65 EDC-K technical manual:
Power Supply
Low current supply to the damper valves results in hard damping and a high current results in soft damping. The EDC-K control module determines the setpoints and outputs pulsewidth modulated (PWM) signals to the damper valves to regulate the current flow. Current flow limitation is ensured by an overcurrent detection and deactivation. All of the analog inputs are protected by diodes against positive and negative overvoltage.
The following analog signals are processed by the EDC-K control module:
• Vehicle supply voltage
• EDC-K switched output voltage
• Damper valve voltage and current
External voltage supply fault fluctuation (nominal should be 5 V +/- 10%)
Voltage supply to EDC control module between 2 V and 8 V
Valve Activation/Output Stage Circuit
The solenoid valves have low resistance, approximately 2.2 ohms per valve at room temperature because high current is needed at a low voltage. The current is set in the 0 to 2 Amps range depending on the desired damping force. The setpoint value will not exceed 2 Amps to avoid valve damage. The solenoid valves are connected in series for each axle and are supplied with a ground (PWM for continuous adjustment) from the EDC-K control module.