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Engine Electrical System

ManualsBrandsCHERY ManualsAutomotiveChery Carry A18 ENGINE ELECTRICAL SYSTEM_E.pdf
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ELECTRONIC CONTROL UNIT
The ECU is located on the left of engine firewall. The ECU handles various signals from the
sensors and controls the actuator so as to achieve the best possible operating condition. Many
extra functions are added as compared with the previous model. While by the usage of a
custom-made circuit board that can achieve many special functions, the integrated functions
are enhanced so that the structure has considerably reduced in size and become much more
compact.
The hard wares in the ECU are as follows:
-16 bit CPU single chip
- 8KB RAM (2KB IRAM + 6KB ERAM)
- 2MB FLASH EPROM (12V programming voltage)
- 2KB SERIAL EEPROM
- 16 CHANNELS 10 MODULES/NO. (A/D) CONVERTER
- 4PWM OUTPUT
- CAN MODULE (CAN2.0B)
The ECU software structure is divided into two parts for data processing:
-The “Application” part obtained the measurement of engineering parameter through sensors
to calculate the control parameters of the fuel injectors, ignition coils and idling speed step
motor for controlling the engine starting.
-The “Basic” part is collecting the data from the sensors and converts it into engineering data.
After that it controls the actuator through the calculated parameter generated by the
“application” software, and manages the self-diagnostic programs of the various sensors and
actuators. In addition, it can also communicate with the externally connected diagnostic
tester through the use of “K” serial cable.
The operating system is capable of ensuring the accurate management of the matters related
with time (such as the management of definite and delay timing) and angles (related to the
engine rotation sequence). This type of management is integrated in the software and
calculated according to the precise priority to ensure the optimization management of the
engine even at its high-speed condition. This type of “modular structure” design allows the
possibility of achieving all kinds of flexibility control and in the mean time not tampering the
overall characteristic of the system.
The following data are transmitted into the ECU:
- Battery voltage
- Absolute pressure sensor in the air intake manifold
- Top dead center
- Throttle valve opening angle position
- Air intake temperature
E-5
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