Page 229 - Foton Workshop Manual - Aumark (BJ1099)

ENGINE CONTROL SYSTEM - ENGINE CONTROL SYSTEM 11-3
SYSTEM OVERVIEW

1. Introduction
BJ486ZLEQ4 engine electronic management system is mainly composed of three
parts of sensor, microprocessor (ECU) and actuator. In the engine electronic control
system, as the input part, the sensor is used to measure all kinds of physical signals
(temperature, pressure, etc.), and transform them into the corresponding electric
signals; The role of ECU is to receive the input signal of the sensor and process
it according to the set program so as to generate the corresponding control signal
and output it to the power-driven circuit, by driving each actuator to perform different 11
actions, the power-driven circuit makes the engine to run according to the fixed
control strategy; at the same time, the fault diagnosis system of ECU monitors
each component and control function in the system, once a fault is detected and
confirmed, the fault code shall be stored and "Limp home function" shall be invoked;
when it is detected that the fault is eliminated, it shall be recovered to normal run.

2. Main functions of this system

NO. FUNCTION NO. FUNCTION

Acceleration/Deceleration and
1 Start control 6
reversed towing fuel cut control

2 Idle speed control 7 Steam generation emission control
3 λClosed-loop control 8 Over-voltage protection

4 Knock control 9 A/C Compressor control
Warming up and heat control of ternary
5 10 Fault diagnosis and limp home
catalytic converter

Page 229