The throttle switch informs the control unit of the idle throttle position. The control unit opens or closes the throttle valve via a servomotor and thus maintains a stable idle speed.
The coolant temperature and intake air temperature sensors report the appropriate temperatures to the engine control unit by changing their resistance when the temperature changes.
The fuel vapor recovery system consists of an activated carbon filter and a solenoid valve. The activated charcoal filter prevents harmful fuel vapors from escaping from the fuel tank into the atmosphere, and evaporating fuel accumulates in the activated charcoal tank. When the engine is running, fuel vapor under the control of a solenoid valve is again fed into the engine for afterburning.
The oxygen sensor measures the oxygen content in the exhaust gas stream. The control unit, at its signal, maintains the content of harmful emissions in the exhaust gases at the lowest level. For vehicles with a catalyst, the composition of the exhaust gases is maintained at a level that provides the best afterburning in the catalyst.
The knock sensor is used to detect the onset of detonation in the engine cylinders and, based on this information, the engine control unit reduces the ignition timing. In the presence of ignition faults, the control unit shuts off the fuel supply to the corresponding cylinder.
ENGINE 1.8-I-/125-PS
These engines use a variable length engine air supply system, which, depending on the engine operating conditions, changes the length of the air path entering the cylinders. For this, a pneumatically actuated butterfly valve is used. At low engine speeds, the air enters along a longer path and, due to resonance, the engine is more completely filled, resulting in increased torque.
ENGINE 1,8-I/ 125 PS
For optimal operation of the engine at all speeds and an increase in torque, a system for shifting the moment of opening and closing valves is used. The moment of opening and closing of valves is determined by the position of the camshaft cams. Changing the relative position of the camshafts is carried out by a chain. The hydraulic movement mechanism changes, depending on the engine speed, the drive point of the camshaft chain. As a result, the time interval between the control of the intake and exhaust valves varies.
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