Geely EC718 2009 Workshop Manual page 675

Engine
2.12.3 System Working Principle
2.12.3.1 Electronic Throttle Body (ETC)
Working Principle
Electronically controlled throttle body assembly must be use
dedicated engine electronic control module (ECM) with ETC
system-driven feature hardware as the core control element.
System control software usually uses the engine torque output
control mode as computer algorithms. At the same time, due
to the cancellation of the traditional mechanical throttle valve
control of mechanical pull cables, ETC is equipped with a pedal
position sensor (APP) with a resistive potentiometer device, in
order to provide vehicle handling demand information and
other information for the driver to control the vehicle to the
engine electronic control module (ECM).
Electronic throttle body opening is determined by ECM
according to the acceleration pedal control input signals. With
other engines and vehicles sensor input signals, ECM analyzes
the driver's intention and calculates the needed engine output
power and accordingly adjusts the engine throttle opening and
fuel supply (injection) amount. At the same time, the
electronically controlled throttle position sensor can detect the
actual throttle opening and send the feedback to ECM. ECM
Control System JL4G15-D
then based on this feedback signal adjusts the vehicle control
parameters. This control process ensures that the engine and
vehicle work in the ideally controlled conditions.
EC718/EC718RV EC715/EC715RV 10/2009
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