Types of air flow meter sensors and how they work

At present, the common air flow sensor can be divided into vane air flow meter and Carmen according to its structural type.

Scroll air flow meter, ** air flow meter, hot film air flow meter. According to the detection method, it is divided into two categories: flow type and speed density type: the flow type is to use the air flow sensor to directly measure the amount of air inhaled into the engine, and the flow type air flow sensor mainly includes:

There are several types of fin type, Kalman vortex type, ** type and hot film type, among which the fin type and Kalman vortex flow sensor measure the volume of inhaled air, so it is also necessary to calculate the air quality by the electronic control unit according to the inlet air temperature and other information.

** and hot film are direct measurements of the quality of the inhaled air, so they are more accurate.

Principle: The amount of air drawn into the engine is converted into an electrical signal and sent to the ECU, which is one of the main bases for determining the basic fuel injection volume. It is a sensor that measures the flow of air into the suction engine.

In order to obtain the best concentration of mixtures in a wide range of operating conditions, electronically controlled gasoline injection engines must accurately measure the amount of air drawn into the engine at each moment as the main basis for ECU calculation (control) of the amount of fuel injected. If the air flow sensor or line fails, the ECU cannot get the correct air intake signal, and the fuel injection volume cannot be controlled normally, which will cause the mixture to be too thick or too thin, so that the engine will not run normally.

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Here are some of the well-known brands recognized in the flowmeter industry that are widely recognized and have a great reputation. While rankings may vary depending on time and market conditions, the following brands are generally considered to be among the top brands in the valve industry:

The following are the top ten domestic first-line valve brand manufacturers in 2022-2023, but for reference only: Suzhou Neway Valve Co., Ltd., Shanghai Guanlong Valve Machinery, Shanghai Qizhong Valve Manufacturing, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

An air flow meter is a device that measures the amount of air intake into an engine and is used in L-type injection systems.

The air flow meter is installed between the air filter and the throttle body, and some are mounted on the air filter, and some are integrated with the throttle body and installed on the engine.

The air flow signal is one of the main bases used to determine the basic fuel injection volume. According to its structural form, it can be divided into the following four types:

Fin-type air flow meter, which is a volumetric flow type. It was more popular in the 70s of the 20th century.

The Carmen vortex air flow meter, which is a volumetric flow type, is mostly seen in Mitsubishi and Toyota vehicles.

** type air flow meter, for the mass flow type, developed in the early 80s of the 20th century, now widely used.

Thermal film air flow meter, for the mass flow type, developed by General Motors of the United States, is mostly used in the cars produced by General Motors and Isuzu Corporation of Japan, and the electronically controlled fuel injection engines produced in China are also widely used.

1. Introduction to air flow meter.

The role of the air flow meter.

The air flow meter measures the amount of fresh air entering the engine intake manifold and the intake air temperature, and the ECU uses this information to make injection corrections, smoke limits, and EGR opening control.

2.Installation location.

The sensor is mounted on the engine intake duct and at the rear end of the air filter.

3.How it works.

The principle of an air flow meter.

The air flow sensor is to integrate some electronic components on a ceramic substrate, when the engine is working normally, the diaphragm is first heated, and the fresh air flows through the sensor will take away part of the heat, at this time the ECU will control the Wheatstone bridge on the diaphragm to supplement the diaphragm, which will cause a change in the electrical signal, when the signal is transmitted to the ECU, the ECU will calculate the air intake according to this change.

The principle of the air temperature sensor.

The inlet air temperature sensor is a negative temperature coefficient resistor, when the inlet air temperature changes, the resistance value of the resistor will change, causing a change in the signal voltage at the ECU terminal, and the ECU calculates the inlet air temperature based on this change.

Determination of the direction of the airflow.

There is a same temperature resistance at both ends of the hot film of the air flow meter, and when the air flow flows through the hot film, it will take away part of the heat, so the temperature at the front end of the hot film is lower than the temperature at the rear end, and the ECU judges the direction of the air flow according to this signal!

4.Wiring diagram of an air flow meter.

5.Control policy.

The ECU will monitor the working condition of the air flow meter at all times, and when the ECU judges that the air flow meter is faulty, it will take corresponding control, as follows.

The engine mil light is lit, the EGR system is withdrawn from work, and the exhaust gases will no longer participate in the system work;

The engine speed will be limited to a certain speed, and the power will be limited;

When the air flow meter fails, the engine start is not affected and can be started normally;

Second, the detection of air flow meter:

Fault codes related to air flow meters

The air flow sensor, also known as the air flow meter, is used to detect the size of the engine air intake, and convert its information into an electrical signal to transmit to the ECU, which has been used by the ECU to calculate and determine the injection time and ignition time

It converts the intake air flow into an electrical signal and sends it to the electronic control unit (ECU), as one of the basic signals to determine fuel injection, it is a sensor that determines the air flow of the suction engine, and the air flow sensor, also known as the air flow meter, is one of the important sensors of the EFI engine.

There are many types of air flow sensors for electronically controlled gasoline injection systems, and common air flow sensors can be divided into blade (wing) type, measuring core type, ** type, hot film type, Carmen vortex type and so on according to their structural type.

The air flow sensor, also known as the air flow meter, is one of the important sensors of EFI engines. It converts the intake air flow into an electrical signal and sends it to the electronic control unit (ECU), which is one of the basic signals that determines fuel injection, and is a sensor that measures the air flow of the suction engine.

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According to its structural type, the air flow sensor can be divided into blade (wing plate) type, measuring core type, ** type, hot film type, Carmen vortex type and so on.

The air flow sensor, also known as the air flow meter, is one of the important sensors of EFI engines. It converts the intake air flow into an electrical signal and sends it to the electronic control unit (ECU) as one of the basic signals that determines fuel injection. It is a sensor that measures the flow of air into the suction engine.

The air hail flow meter, also known as the air flow sensor, is an inductor that measures the total air flow sucked into the engine, and is also one of the key sensors of the EFI engine. Air flow meter is used to collect information about the air intake of the engine sail between the air filter and the plastic hose of the air intake, and its function is to check the air intake of the engine cylinder, and to adjust the gasoline and diesel ration according to it.

The air flow meter converts the total flow information of the intake air into an electronic signal, which is used as the main data signal for the decision-making oil pump, and transmits it to the engine electronics control module (ECU) for calculation, which is used to calculate all the functions related to the speed ratio and load, such as the time of gushing, the moment of ignition, etc. If there is a common fault in the air flow sensor or distribution line, the ECU cannot get an accurate air intake data signal, and it will not be able to routinely carry out the ignition advance angle control, which will cause the gas mixture to be too thick or too thin, and the engine will run abnormally.

There are many forms of air flow meters, and the air flow sensors of the general bridge can be divided into several categories according to their construction types, such as leaf type, measuring core type, **** type, hot film type, and Lenny scroll compressor. For the air flow meter, most of them are around 200 yuan, but the actual price is related to the well-known brand, structure and car model of the commodity.

Millions of car purchase subsidies.

The main function of the automobile air flow meter is to monitor the size of the engine air intake, which can convert the air intake information into a canopy signal, and then transmit it to the electronic control unit. Next, the electronic control unit receives the signal and decides how much fuel the engine will inject.

If the air flow meter is in an abnormal situation, although it will not cause the engine to fail to start, it will have a certain impact on the power performance of the engine. Generally, the damage of the air flow meter is caused by the use of a poor quality air filter, or the air filter has not been replaced for a long time, which causes the hot wire of the air flow meter to accumulate a lot of dust, resulting in abnormal changes in resistance values.

Symptoms of a broken air flow meter.

The symptoms of the broken air flow meter are that the engine is moving, intermittent stalling, in this case, the idle speed of the vehicle is normal, the acceleration in situ is normal, and it is normal to drive at the usual speed, but it may be that the speed exceeds 120 kilometers per hour, the vehicle has the above fault phenomenon, and the situation of this failure may be caused by the inaccurate signal output of the air flow meter at high speed.

There are many reasons why the engine stalls at high speed and the vehicle moves, such as reduced fuel injection, ignition system failure, exhaust gas recirculation, gasoline fuel vapor ** system, and the wrong output signal of a sensor.