Powertrain Management: Description and Operation

MPI System Inputs And Outputs:

Bosch Motronic for the 2.22 Liter 5 cylinder Turbo

DESCRIPTION
The Motronic Engine Management System combines the ignition system, fuel injection system, charge pressure control system, and emissions system into a single electronically controlled system. The Motronic system uses a single control module with 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, boost pressure and all other subsystems.

PURPOSE
The Motronic Engine Management System is to electronically regulate the air/fuel mixture, boost pressure, idle speed and ignition timing to achieve optimum engine performance. Optimum performance means the best possible compromise between the demands of high power, low fuel consumption, and the cleanest possible exhaust emissions.

MOTRONIC SUBSYSTEM FUNCTIONS

Sequential Fuel Injection
^ Basic adaptation
^ Cold-start enrichment
^ After-start enrichment
^ Acceleration enrichment
^ Deceleration fuel shut-off
^ Engine RPM limitation
^ Oxygen sensor control

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

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

Charge Pressure Control
^ Map controlled

Evaporative Emission System
^ Map controlled

Heated Oxygen Sensor
^ Map controlled