Page 234 - Foton Workshop Manual - Aumark (BJ1099)

11-8 ENGINE CONTROL SYSTEM - ENGINE CONTROL SYSTEM

4. λClosed loop control

5. Knock control
• The system detects the characteristic vibration when the knock occurs by the
knock sensor installed between the NO. 2 cylinder and NO. 3 cylinder of the
engine and converts it to the electronic signal, so as to transmit to ECM for
processing.
• ECM uses a special processing algorithm that it detects if there is a knock
occurring in each combustion cycle of each air cylinder. Once a knock is detected,
the knock closed loop control shall be triggered. After the shock danger is
eliminated, the affected cylinder may be gradually advanced to the predetermined
ignition advance angle again.
6. A/C compressor control
• When the air-conditioning switch is turned on, ECM will receive the signal called
air conditioning request, and make preparations for loading the air conditioning
according to the operating condition of the engine at that time, then connect air-
conditioning compressor.
• ECM will control the connection and disconnection of air-conditioning according to
the needs of self-protection of the air-conditioning. In order to ensure power take
off and protect the engine, the system will disconnect the air-conditioning under
some certain conditions.
7. Steam generation emission control
• Due to the reason of external radiation heat and oil return heat transfer, the fuel
oil in the tank is heated to form the fuel vapor.
• Due to restrictions with evaporative emission regulations, these vapor containing
a large amount of HC content is not allowed to be directly discharged into the
atmosphere. In the system, the fuel vapor is collected in the charcoal canister
through the conduit, and then it enters into the engine to participate in the process
of combustion by flushing at the proper time.
• The flow of flushing the airflow is achieved by ECM controlling canister solenoid.
This control may work only when the λ closed-loop control system is in the
closed loop working mode.

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