Functional Description

The electronic throttle control system (EDR) was developed specifically for the S62 engine. The design criteria was to develop an EML system capable of actuating the eight throttles while ensuring that the power potential of the S62 engine was not compromised. The three main components of the system include:

• The pedal position sensor (PWG) - same component that is used on the M62 TU EML system.
• The EDR motor - new component designed with the ability to control the eight throttles.
  Fig 1: Identifying Electronic Throttle Control (EDR)

  Courtesy of BMW OF NORTH AMERICA, INC.
• MS S52 engine control system - responsible for operation and monitoring of the throttle control system.

The pedal position sensor is the driver's wish for increased torque output of the engine. The PWG input is processed by the MS S52 control module. Plausibility checks are carried out and the EDR motor is operated to open the throttle valves. All eight throttle valves are opened simultaneously through the linkages connected to the EDR. The system requires approximately 120 ms to fully open the closed throttle valves.

Feedback of the current throttle valve position is achieved through two throttle valve potentiometers located on the ends of the throttle valve shafts.