Air temperature sensor
The amount of air required for complete combustion of the fuel directly depends on the ambient temperature.
As you know, cold air is much denser than warm air. The amount of incoming air in the system therefore depends not only on the damper position, but also on the air temperature. In order to increase the accuracy of determining the mass of air consumed and ensure the optimal ratio of air and fuel, under various operating conditions, the intake system is equipped with a sensor (see Fig. 304), which transmits information about the temperature of the supplied air to the microprocessor module, thereby allowing you to supply exactly the right amount of fuel. In models equipped with an air flow meter, the air temperature sensor is usually located in the body of the flow meter. Possible malfunctions caused by incorrect operation of the air temperature sensor Transmporter T5 .
- The engine does not start or starts with difficulty.
- The engine stalls immediately after starting.
- Increased fuel consumption.
- Increased concentration of CO in the exhaust gases at idle.
Rice. 305 The microprocessor module receives the following information: from the damper position sensor - damper position from the engine temperature sensor - engine temperature from the crankshaft position sensor - TDC position from the speed sensor - crankshaft speed from the air flow meter - the amount of air supplied by the engine
After processing this information, the device transmits a control signal to the injectors (duration of the injection moment) and the ignition coil (change of ignition parameters).
System Block Diagram (See Figure 306)
Rice. 306 The principle of operation of the fuel injection system
T4 engine device .