EML-BMW.pdf

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bmw_eml_overview

INTRODUCTION

The Electronic Throttle Control System (EML) regulates the operation of the throttle valve(s).

The scope of EML design on BMW engines provides:

• Throttle valve positioning for optimum starting

• Precise idle speed regulation without the use of an external idle control valve/circuit

• Progressive throttle opening curves matched to the driving program (with EGS/AGS inter-

face)

• Cruise control operation without additional control modules and linkages

• Automatic synchronization of the throttles (airflow balancing) for two independent banks,

throughout the entire engine speed range (M70, S70, M73 engines only)

• Intake air volume control for ASC/DSC (Automatic Slip Control/Directional Stability Con-

trol) systems

• Maximum road speed limiting

• Emergency “Failsafe” operation in the event of component failures

The EML control module is a link in the total scope of Engine Management Control. The EML

is interfaced with other control modules to complete the management system, which in-

cludes:

• ECM(s) - Except E46 (EML integrated in MS42.0 ECM)

• EGS/AGS

• ABS/ASC

The main components of the EML system are:

• Accelerator pedal position sensor (PWG)

• Accelerator pedal position sensor (driver’s wish sensor - integrated in throttle housing,

E46 MS42.0)

• Throttle valve assembly/assemblies with electronic control motor(s) - DK/MDK

• EML control module (MS42.0 ECM - E46)

2

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EML SYSTEM OVERVIEW

Throttle valve control is managed electronically, using an electric motor(s), without the use of

mechanical linkages or cables (except E46 - MDK).

The EML system uses a microprocessor to convert the input signal for the position of the

accelerator pedal into output commands for control of the throttle valve. The position of the

pedal is merely a request to the control module for throttle opening. The EML module pro-

cesses this input request along with other pertinent operating parameters. The throttle valve

is then moved to its proper position according to specific control unit programming.

The total scope of output control functions for the EML includes:

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EML Control System Version Identification By Vehicle

BMW engine management systems have evolved through the model years. The evolution is

due to continued technical refinement and emission level compliancy.

Same version systems may be different from vehicle-to- vehicle. This additionally increases

the number of system variations as well.

V

S

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M

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E

E

G

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-

p

r

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SYSTEM OVERVIEW - I-P-O

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SYSTEM OVERVIEW - I-P-O

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