Brake oil pressure sensor 55CP09-03 for BMW E49 E90

Sensor for engine control

There are many kinds of sensors for engine control, including temperature sensor, pressure sensor, speed and angle sensor, flow sensor, position sensor, gas concentration sensor, knock sensor and so on. This kind of sensor is the core of the whole engine. Using them can improve the engine power, reduce fuel consumption, reduce exhaust gas, reflect faults, etc. Because they work in harsh environments such as engine vibration, gasoline vapor, sludge and muddy water, their technical index of resisting harsh environment is higher than that of ordinary sensors. There are many requirements for their performance indicators, among which the most important is the measurement accuracy and reliability, otherwise the error caused by sensor detection will eventually lead to engine control system failure or failure.

1 Speed, angle and vehicle speed sensors: mainly used to detect crankshaft angle, engine speed and vehicle speed. There are mainly generator type, reluctance type, Hall effect type, optical type, vibration type and so on.

2 Oxygen sensor: The oxygen sensor is installed in the exhaust pipe to measure the oxygen content in the exhaust pipe and determine the deviation between the actual air-fuel ratio of the engine and the theoretical value. The control system adjusts the concentration of combustible mixture according to the feedback signal to make the air-fuel ratio close to the theoretical value, thus improving economy and reducing exhaust pollution. The practical application is zirconia and titania sensors.

3 Flow sensor: It measures intake air and fuel flow to control air-fuel ratio, mainly including air flow sensor and fuel flow sensor. The air flow sensor detects the amount of air entering the engine, so as to control the injection amount of the fuel injector and obtain a more accurate air-fuel ratio. The practical applications include Carmen vortex type, vane type and hot wire type. Carmen has no moving parts, sensitive response and high accuracy; Hot-wire type is easy to be affected by the pulsation of inhaled gas, and it is easy to break wires; The fuel flow sensor is used to determine the fuel consumption. There are mainly water wheel type and ball circulation type.