EDR Safety Concept

EDR SAFETY CONCEPT

A pre-drive check of the EDR system is carried out every time the ignition is switched On (KL 15). The MS S52 control module briefly opens the throttles and checks the following:
- The zero set point of the feedback potentiometers - throttle valve closed position.
- Free movement of the throttle valves.
- Operation of the EDR actuator motor.
- Operation of the return springs in the EDR actuator motor.

EMERGENCY PROGRAMS

There are a total of four emergency operation programs stored in the MS S52 control module. The MS S52 control module will activate one of these programs depending on which fault is present or what the tailed component is. With any fault that is relevant to the EDR system, the engine's output torque will be reduced to provide limited driveability of the vehicle.

EMERGENCY PROGRAM #1. - Engine operation with PWG input. The engine's output torque is limited to 480 Nm. This program will set with faults in one PWG sensor input or one throttle valve feedback input.

EMERGENCY PROGRAM #2. - Engine operation through the idle valve actuator. The engine's output torque is limited to 300 Nm and the vehicle's speed to 70 MPH. With program #2, the throttle valves are shut down and only the idle valve is used for engine operation, This program will set with a fault in one air mass sensor input and one PWG sensor input.

EMERGENCY PROGRAM #3. - Engine operation with jammed throttle valves. The engine's output torque is limited to 300 Nm and the speed is limited to 35 MPH. This is carried out through ignition and injection intervention if the M5 S52 senses that the throttle valves are jammed or stuck and cannot be closed by applying power through the EDR actuator.

EMERGENCY PROGRAM #4. - Engine operation with a control module internal fault. The engine's output torque is limited to 250 Nm and the speed is limited to 35 MPH. Depending on the degree of the fault, the control module with the dual processors will enable limited engine operation.