Engine Management System - Mash Side 400 Mode D'emploi

VII、

Engine management system

The Engine Management System(EMS) comprises electronic control unit(ECU), throttle
body, Idle speed control valve, fuel pump, fuel injector, ignition coil, O2 sensor, throttle
position sensor, T-MAP sensor, cylinder head temperature sensor and so on. Based on
the air flow and engine speed, the fuel injector and ignition coil are controlled by ECU to
get the optimal combustible mixture of fuel and air and Ignition timing which meet all
engine operating conditions. The EMS use sensors to collect parameters such as air flow,
temperature of inlet air, cylinder head temperature, atmospheric pressure and the
operation state of engine (rpm, load, acceleration and deceleration). All parameters are
transferred to the ECU with electronic signal. The ECU output controlling signals after
input signal are handled. Through the engine and actuators on the vehicle (ignition coil,
fuel injector, Idle speed control valve and so on), the fuel and fire are exactly controlled
and corrected with closed loop. For production conformity, corrected fuelling in order to
match up to the difference of vehicles due to the inconformity of components.
System composition:
1. Sensor:
• Intake air pressure sensor (load information) intake air temperature and
pressure sensors
• Throttle position sensor (load information, load range information,
acceleration/deceleration information)
• Engine speed sensor (speed information, crankshaft position)
• Intake air temperature sensor (air density information)
• Oxygen sensor (information of the excess air coefficient is more than 1 or less
than 1)
2. Actuator:
• Fuel pump relay,
• Fuel pump
• Fuel injector (fuel supply)
• Ignition coil
• High-tension cord
• Spark plug (ignition)
• Throttle, Idle speed control valve (air intake)
3. Electronic control unit
• ECU
Major parts and components
Cylinder Head Temperature Sensor
46
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Fuel Injecto