Best Price: Factory Supplying Car Engine Air Flow Sensor

You can get whatever you need for the car engine air flow sensor! Here a general introduction of the manufacturer of MAF sensor. Jiangxi Getai Auto Parts Co.,Ltd is specialized in manufacturing mass air flow sensor (MAF sensor) in China for over 10 years. The company have passed ISO 14001 and ISO9001 certification by adopting a strict production and management system to improve the products’ quality and have wined customers’ credit and long-term cooperation in overseas and domestic markets.

Here is the general introduction of the engine air flow sensor. The engine air flow sensor is one of the important sensors of the electronic fuel injection engine. It is responsible for detecting the intake volume of the engine and converting this information into an electrical signal to be transmitted to the electronic control unit (ECU) as the main basis for calculating the injection volume. The accuracy and reliability of the air flow sensor directly affect the performance and emission level of the engine.

Types of air flow sensors

There are mainly the following types of air flow sensors:

Valve air flow sensor: installed between the air filter and the throttle, detects and converts the intake volume into an electrical signal.

Kaman vortex air flow sensor: measures air flow by detecting the vortex frequency, with high accuracy and long life.

Hot wire air flow sensor: uses the cooling effect of air flowing through a hot metal wire to measure flow, suitable for mainstream measurement methods. Jxgertay’s mass air flow sensor adopted hot wire air flow sensor, with higher accuracy and efficiency to provide customer solid quality and longer life performance.

Hot film air flow sensor: similar to the hot wire type, but uses hot film instead of hot wire, with higher reliability and simpler structure.

Core air flow sensor: calculates air flow by measuring pressure difference, suitable for measuring high viscosity fluids.

Intake absolute pressure sensor: Although it does not directly measure air flow, it indirectly calculates air flow by measuring the absolute pressure in the intake pipe, and is often used in conjunction with a temperature sensor to improve measurement accuracy.

Working principle of air flow sensor

The working principle of the air flow sensor depends on its type. For example, hot wire and hot film sensors use thermal effects to measure air flow, while Karman vortex sensors calculate flow by detecting vortex frequency. Regardless of the type, they need to convert physical quantities into electrical signals so that the ECU can read and process.

Importance of air flow sensor

The air flow sensor is essential for the normal operation of the engine. If there is a problem with the sensor or its circuit, the ECU will not be able to get an accurate intake signal, and thus cannot properly control the injection amount, resulting in too rich or too lean mixture, affecting engine performance and emissions.

Maintenance and fault diagnosis

Because the air flow sensor works in a harsh environment, it may cause inaccurate measurements due to contamination, damage or other reasons. Regular inspection and cleaning can help keep the sensor in good working condition. If the sensor fails, it may cause problems such as abnormal engine operation and increased fuel consumption. When diagnosing a fault, the working status of the sensor can be determined by checking its output voltage or frequency.

If the air flow meter fails, it will inevitably cause errors in the fuel supply, thus affecting the normal operation of the engine and even causing damage to the parts.

Resistance test: It mainly detects the conductivity of the wiring harness to confirm that the wiring harness is unobstructed, there is no short circuit, the connector is reliable, and there is no interference in the transmission of various signals.

Voltage test: There are two parts: power supply voltage test and signal voltage test. Among them, the signal voltage test is the main basis for determining whether the air flow meter is invalid.

The negative pole of the battery or the intake manifold housing should display a voltage of about 1.5V at idle speed, and the accelerator pedal should be pressed sharply.

What can we do if the air flow sensor is damaged?

If it does not meet the above changes, or the voltage drops instead, it can be concluded that the air flow sensor is damaged and must be replaced on the premise that the power supply voltage and the reference voltage are intact.

Measure the working output signal: unplug the injector wiring harness, start the engine or use the starter to drive the engine alone, and use a multimeter to measure the voltage between the VS terminal and the E2 terminal. The voltage should gradually decrease as the blade opening gradually increases, otherwise it means that the air flow meter is damaged and should be replaced.

In summary, the engine air flow sensor is a key component in modern automotive electronic control systems. It ensures that the engine can obtain the best air-fuel ratio under various operating conditions by accurately measuring the intake volume, thereby achieving efficient and stable operation.