SSANGYONG KYRON 2007.04 Manual page 277

09-10
1491-01
2. STRUCTURE AND FUNCTION OF ECU
1) Function of ECU
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 gas.
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 ~ +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.
3. CONTROL FUNCTION OF ECU
▶ Controls by operating stages
- 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.
ENGINE D20DT
KYRON 2007.04