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The Role of Automotive Sensors

2019-12-24

The role of automotive sensors


A sensor is a detection device that can sense the measured information, and can transform the sensed information into electrical signals or other required forms of information output in accordance with a certain rule to meet the transmission, processing, storage, display, record, and control.

Automotive Sensor Principle

The car sensor converts various operating conditions in the car, such as vehicle speed, the temperature of various media, and the operating conditions of the engine, into electrical signals to the computer, so that the engine is in the best working state. There are many automotive sensors. When judging a sensor failure, not only the sensor itself, but the entire circuit where the failure occurs should be considered. Therefore, when looking for faults, in addition to the sensors, check the wiring harness, connectors, and related circuits between the sensors and the electronic control unit.

Automotive Sensor Function Introduction

Manifold Absolute Pressure Sensor

[Manifold Absolute Pressure Sensor]


Manifold Absolute Pressure Sensor used in electronically controlled fuel injection engine: reflects the change in absolute pressure in the intake manifold, and provides the ECU (engine electronic control unit) with a reference signal for calculating the injection duration;



Air Flow Sensor

[Air Flow Sensor]

Air Flow Sensor: measures the amount of air sucked by the engine and provides it to the ECU as a reference signal for the injection time;

Throttle Position Sensor

[Throttle Position Sensor]

Throttle Position Sensor: measures the throttle opening angle and provides it to the ECU as a reference signal for fuel cut, control of fuel-air ratio, and ignition advance angle correction;


Crankshaft Angle Sensor

[Crankshaft Angle Sensor]

Crankshaft Angle Sensor: detects crankshaft and engine speed, and provides it to the ECU as a reference signal for determining ignition timing and working sequence;


Oxygen Sensor

[Oxygen Sensor]

Oxygen Sensor: Detects the oxygen concentration in the exhaust and provides it to the ECU as a reference signal to control the fuel / air ratio near the optimal value (theoretical value);


Intake Air Temperature Sensor

[Intake Air Temperature Sensor]

Intake Air Temperature Sensor: Detects the temperature of the intake air and provides it to the ECU as a basis for calculating the air density;


Water Temperature Sensor

[Water Temperature Sensor]

Water Temperature Sensor: detects the temperature of the coolant and provides engine temperature information to the ECU.



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