Introduction

The EML IIIs is a newly developed electronic throttle control system for the M73 V-12 engine. The EML IIIs was designed and developed by Siemens to BMW specifications.

The concept of the EML IIIs system remains the same as the current EML system used on the M70 engine. The new EML IIIs system continues to use two throttle valves and one pedal position sensor (PWG). The EML IIIs control module regulates the position of the throttle valves based on the input from the pedal position sensor. These main components provide the same function as the M70 Bosch EML components do.

In Addition To Throttle Control, The Main Functions Of The EML IIIs Include:
- Idle stabilization by regulating the throttle openings at idle.
- Throttle valve positioning for optimum starting.
- Synchronization of the cylinder banks.
- Air volume control for ASC/DSC operation.
- Cruise control regulation (the EML IIIs control module contains the new GR II logic introduced on the E38 740).
- Maximum road speed limiting

The operation of the EML IIIs has been enhanced with additional backup (redundancy) features. This helps ensure reliable operation while maintaining a high level of operational safety.

The fault memory of the EML IIIs control module is now stored in an EEPROM so that disconnection of the battery will not erase any stored faults.

The EML IIIs system is incorporated into the driving management system and is connected to the CAN line for signal interfacing with the DME, ASC+T and AGS control modules.

Highlights Of The New EML III System Include:
- The EML IIIs control module contains two separate processors for redundant checking of inputs and output controls.
- Each throttle valve is now controlled by two separate stepper motors driving one rotor and shaft (redundancy operation).

- Each DK assembly contains two feedback potentiometers for throttle position recognition.
- The pedal position sensor (PWG) now contains three inductive coils for the pedal position input (redundancy operation).
- The hall sensor brake pedal switch is used for the brake pedal input.
- Logic monitoring of pedal/throttle valve operation no longer includes the use of the 90 and 170 switches.
- The external safety path circuit is a new design.
- E38 EML fault indication is now handled by the Check control module, through the instrument cluster matrix display.