Computers and Control Systems: Description and Operation

20v Motronic System Diagram:

Bosch Motronic for the 2.22 Liter 20v TURBO

The Motronic Engine Management System combines the ignition system and fuel injection system and controls both electronically with one control module.

The Motronic control module has an internal digital micro-computer. A number of three dimensional maps are stored in the control module's memory. These maps are used to control ignition timing, knock regulation, injection timing and all other subsystems.

MOTRONIC SUBSYSTEMS

Sequential Fuel Injection
^ Basic adaptation
^ Start control
^ After-start enrichment
^ Acceleration enrichment
^ Deceleration fuel shut-off
^ Engine rev limiter
^ Oxygen sensor control

Ignition
^ Basic ignition map
^ Dwell angle control
^ Warm-up control
^ Start control
^ Cylinder selective knock control

Idle Speed Control with adaptation
^ Map controlled
^ Start controlled
^ Initial climate control (A/C ON/OFF)

Evaporative Emission System
^ Map controlled

Heated Oxygen Sensor
^ Map controlled

Charge Pressure (boost) Control
^ Map controlled

ADVANTAGES

The advantages of using the Motronic system include:
^ Optimum fuel economy due to low fuel consumption through adaptation of all operating conditions.
^ Emission control with adaptation of injection rate and ignition timing.
^ Reduced maintenance and ease of servicing due to improved diagnostics.