1.2 Continuous Injection System-Electronic (CIS-E)
CIS-E is a mechanical continuous-flow fuel injection system, in which the basic fuel metering-controlled by the air flow sensor and fuel pressure-is fine-tuned by the precise electronic control of fuel pressure. The main components of CIS-E are the air flow sensor, the fuel distributor, the fuel injectors, the differential pressure regulator, and the electronic control unit.
The air flow sensor measures the volume of air entering the engine. Based directly on the movement of the air flow sensor, the fuel distributor meters a proportional amount of fuel to the fuel injectors. The fuel distributor's basic fuel metering is fine-tuned by the differential pressure regulator, an electro-hydraulic valve which makes small and continuous changes to fuel pressure based on signals from the electronic control unit.
The electronic control unit controls the action of the differential pressure regulator by analyzing engine coolant temperature, engine speed, throttle position, and oxygen content in the exhaust. For more detailed information on CIS-E and its functions, see 6. CIS-Electronic (CIS-E) and CIS-E Motronic.
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