Ecu Control; Ecu Function; Control Function; Controls By Operating Stages - SSANGYONG Korando 2012 Manual

Hide thumbs Also See for Korando 2012:

Table of Contents

2) ECU Control

(1) Function

a. ECU Function

ECU receives and analyzes signals from various sensors and then modifies those signals into

permissible voltage levels and analyzes to control respective actuators.

ECU microprocessor calculates injection period and injection timing proper for engine piston speed and

crankshaft angle based on input data and stored specific map to control the engine power and emission

Output signal of the ECU microprocessor drives pressure control valve to control the rail pressure and

activates injector solenoid valve to control the fuel injection period and injection timing; so controls

various actuators in response to engine changes. Auxiliary function of ECU has adopted to reduce

emission gas, improve fuel economy and enhance safety, comforts and conveniences. For example,

there are EGR, booster pressure control, autocruise (export only) and immobilizer and adopted CAN

communication to exchange data among electrical systems (automatic T/M and brake system) in the

vehicle fluently. And Scanner can be used to diagnose vehicle status and defectives.

Operating temperature range of ECU is normally -40 to +85°C and protected from factors like oil,

water and electromagnetism and there should be no mechanical shocks.

To control the fuel volume precisely under repeated injections, high current should be applied instantly

so there is injector drive circuit in the ECU to generate necessary current during injector drive stages.

Current control circuit divides current applying time (injection time) into full-in-current-phase and hold-

current-phase and then the injectors should work very correctly under every working condition.

b. Control Function

To make optimum combustion under every operating stage, ECU should calculate proper injection

volume in each stage by considering various factors.

Starting injection volume control

During initial starting, injecting fuel volume will be calculated by function of temperature and engine

cranking speed. Starting injection continues from when the ignition switch is turned to ignition

position to till the engine reaches to allowable minimum speed.

Driving mode control

If the vehicle runs normally, fuel injection volume will be calculated by accelerator pedal travel and

engine rpm and the drive map will be used to match the drivers inputs with optimum engine power.