Diesel flow meter calibration | Great Wall Haval H6 diesel air flow meter malfunction

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1. Introduction to Diesel Flow Meter

Diesel flow meter is a flow meter that uses a turbine for measurement. It first converts the flow velocity into the rotational speed of the turbine, and then converts the rotational speed into an electrical signal proportional to the collapse and flow rate. This type of flowmeter is used to detect instantaneous flow and total cumulative flow, and its output signal is frequency, which is easy to digitize. The induction coil and permanent magnet in the picture are fixed together on the housing. When the ferromagnetic turbine blades pass through the magnet, the magnetic resistance of the magnetic circuit changes, thereby generating an induction signal. The signal is amplified and shaped by an amplifier and sent to a counter or frequency meter to display the total accumulated flow rate. At the same time, the pulse frequency is converted from frequency to voltage to indicate the instantaneous flow rate. The rotational speed of the impeller is proportional to the flow rate, and the rotational speed of the impeller is proportional to the total amount of flow. The output of the turbine flowmeter is a frequency modulated signal, which not only improves the anti-interference ability of the detection circuit, but also simplifies the flow detection system. Its range ratio can reach 10:1, and the accuracy is within ± 0.2%. The time constant of a turbine flowmeter with small inertia and size can reach 0.01 seconds.

2. Malfunction of the Great Wall Haval H6 diesel air flow meter

Malfunction of the Great Wall Haval H6 diesel version air flow meter can cause problems such as unstable engine idle, poor acceleration, backfiring of the intake pipe, and black smoke from the exhau

st pipe. In severe cases, it can trigger ECU protection strategies to limit engine power output, but it does not affect normal starting.

. The function and fault principle of air flow meter. Air flow meter is the core sensor of diesel engine intake system, responsible for real-time monitoring of the amount of air entering the engine and transmitting data to ECU (Electronic Control Unit). The ECU accurately calculates the fuel injection amount based on parameters such as air flow rate and speed, ensuring the optimal mixing ratio of fuel and air. If the air flow meter malfunctions (such as signal distortion, circuit breakage, or sensor damage), the ECU cannot obtain accurate intake data, which can lead to abnormal fuel injection and cause a series of problems. Typical fault manifestation: Unstable idle speed: Due to incorrect intake data, the ECU is unable to stably control the idle speed, resulting in engine shaking or speed fluctuations. Poor acceleration: Deviation in intake signal leads to insufficient or excessive fuel injection, delayed power output, and slow vehicle response when stepping on the accelerator. Backfire of intake pipe: When the mixture is too lean, unburned fuel is re burned in the intake pipe, producing a "bang bang" abnormal sound. Black smoke from exhaust pipe: When the mixture is too rich, the fuel combustion is not sufficient, and carbon particles are emitted with the exhaust gas, forming black smoke. When the ECU detects a malfunction in the air flow meter, it will activate the emergency mode: turn on the MIL light: the instrument panel engine fault light will light up, prompting the driver to check. Limiting speed and power: To prevent further damage to the engine, the ECU limits the speed to

Diesel flow meter calibration | Great Wall Haval H6 diesel air flow meter malfunction

1. Introduction to Diesel Flow Meter

2. Malfunction of the Great Wall Haval H6 diesel air flow meter

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