What are the commonly used types of Karman vortex air flow meters?

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What is the working mode of the Karman vortex air flow meter?

Set up a cylindrical object (vortex generator) inside the airflow, which generates a stable and continuous vortex called the Karman vortex (Figure 1). The relationship between the frequency of the vortex (Sun Dangyan frequency) and the flow velocity is shown in equation

(1). What is the normal data flow of an air flow meter? The normal data flow of an air flow meter is usually around 2.5g/s, and the specific values vary depending on the type. The parameter unit of a hot plate and hot film air flow meter is V, and the normal data flow is between 0-5V. Here is a detailed explanation: The normal data flow rate of mass flow type air flow meters (such as hot wire and hot film) is around 2.5g/s (at idle). Abnormal range: Below 2.0g/s: Possible air leakage in the intake system (such as ruptured intake pipe or poorly sealed throttle valve). Above 4.0g/s: There may be additional pressure in the intake system (such as turbocharger leakage, air filter blockage causing abnormal negative pressure). Damage symptoms: unstable idle, weak acceleration, black smoke emission, and in severe cases, inability to start. Testing method: If the vehicle can start after unplugging, it may be due to a malfunction in the air flow meter; A more accurate method is to measure the data flow. The normal data flow rate of volumetric flow type air flow meters (such as blade type and Karman vortex type) is about 2.5g/s (at idle), but it needs to be corrected in conjunction with the engine displacement. Abnormal range: Low value: Possible air leakage in the intake duct or distortion of the air flow meter signal. High value: Possible throttle sticking, intake temperature sensor ma

lfunction, or abnormal engine load. Damage manifestation: Similar to mass flow type, but may be accompanied by engine malfunction light on. The normal data flow of hot plate and hot film air flow meters (voltage signal type) is 0-5V (voltage value is inversely proportional to intake volume). Abnormal range: No voltage output: Line open circuit or damaged heating element inside the air flow meter. Voltage above 5V: Signal conditioning circuit malfunction or ECM interface issue. Damage manifestation: The engine enters "limp mode" (fixed fuel injection quantity), power decreases, and emissions exceed the standard. The core function and principle of an air flow meter is to detect the intake volume or temperature of the engine, convert physical quantities into electrical signals (mass flow type is g/s, volume flow type is Hz or V, voltage signal type is 0-5V), and transmit them to the ECM to control the fuel injection quantity and achieve the optimal air-fuel ratio. Its types include: blade type: by driving the blades to rotate through air intake, it drives the potentiometer to output voltage signals. Karman vortex type: using the principle that the frequency of the intake vortex is proportional to the intake volume, it is detected by ultrasonic waves or pressure sensors. Hot wire/hot film type: The heat dissipation rate of the heating wire or hot film is inversely proportional to the intake air volume, and outputs voltage or frequency signals. Optical/Ultrasonic: Detecting the intake volume through the propagation time changes of light beams or ultrasonic waves in the intake channel. Fault diagnosis suggestion data flow analysis: Use a diagnostic instrument to read real-time data from the air flow meter and compare it with t

What are the commonly used types of Karman vortex air flow meters?

What is the working mode of the Karman vortex air flow meter?

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