Sensors on the car

Sensors on the car

Now the car is more and more intelligent, many functions on the car are controlled by the computer to complete, such as engine systems, transmission systems, suspension systems, brake systems, air conditioning systems, body control systems and so on. The computer has to control the system, must obtain the correct information to confirm the state of the system, and then issue the correct instructions to control the system action, so the implementation of the driver's intention, the correct control of the car. The information on these reaction system states is done by a component called a sensor. Even a very common car, up to dozens of sensors, and up to hundreds of cars. So what are the effects of these sensors?

What is a car sensor?

We are in the daily maintenance of the car, often hear a variety of sensors, then in the end what is the car sensor?

In the operation of the car, the system will be in different working conditions, such as water temperature, oil temperature, intake pressure, speed, throttle position, stalls, etc., these information car computers can not read directly, must be translated into the computer can recognize the electrical signal. Car sensor is the implementation of this task, it is running the car light, electricity, temperature, pressure, time and other information into electrical signals, and then enter the car the computer system, and then by the computer in advance of the stored procedures for the calculation and analysis, thus Determine the running status of the car. Now the car on the sensor is very much, here we talk about the car system in the name of the sensor and the role.

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1, the intake pressure sensor

Intake manifold pressure sensor (MAP)

The function of the intake manifold pressure sensor (MAP) is to detect the degree of vacuum of the intake manifold and to convert the pressure signal into an electronic signal to the engine control computer. It is the main reference signal for controlling the pulse width and ignition timing

Divided into two types of semiconductor varistor and capacitive intake manifold pressure sensor.

Ingress manifold pressure sensor failure, the engine will start difficult, performance disorders, acceleration deterioration, idle instability, fuel consumption, accelerated instability, accelerated tempering, blasting, fuel consumption, deflagration and other failures.

2, the crankshaft position sensor

Crankshaft position sensor (CKP)

Crankshaft position sensor (CKP) is one of the most important sensors in the engine centralized control system. It is an indispensable source for confirming the crank angle position and the engine speed. The engine control module (ECU) uses this signal to control the fuel injection quantity, Timing, ignition timing (ignition advance angle), ignition coil charging closure angle, idling speed and electric gasoline pump operation.

3, the camshaft position sensor (CMP)

The camshaft position sensor is used to detect the angular position of the camshaft. The engine control module (ECU) uses this signal to determine the cylinder sequence of the engine to control the injection sequence, the ignition sequence

When the camshaft position sensor fails, the engine output power will be reduced.

4, the engine coolant temperature sensor (ECT)

The engine coolant temperature sensor is used to detect the temperature of the engine coolant and convert the temperature signal into an electrical signal to the engine control module (ECU) as the primary correction signal for gasoline injection, ignition timing, idling and exhaust emission control.

5, piezoelectric knock sensor

The knock sensor is used to detect the knocking of the engine during combustion and to send the knock signal to the engine control computer as an important reference signal for correcting the ignition advance angle

Knock sensor with non-resonant and resonant type of two, generally installed in the 2-cylinder and 3-cylinder, or 1, 2 the cylinder in the middle of a 3,4-cylinder in the middle one. The connection of the general knock sensor is wrapped with shielded wire.

When the knock sensor failure, the engine will deflagration, ignition timing inaccurate, high fuel consumption, power reduction, the engine work rough