Application of Thermal Mass Flow Meter in Vehicle Exhaust Gas Detection

Abstract: The application information of thermal mass flow meter in automobile exhaust gas detection is provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. Abstract: This paper introduces the function, characteristics, installation, application precautions of TF100 thermal gas mass flowmeter in automobile detection, and the scheme of forming a complete automobile exhaust gas detection system with other equipment 1. Introduction With the increasing number of automobiles, automobile tail gas . For more flowmeter manufacturers to select models and price quotations, you are welcome to inquire. The following is the application article details of thermal mass flowmeters in automobile exhaust gas detection. This paper introduces the function, characteristics, installation, application precautions of TF100 thermal gas mass flowmeter in automobile detection, and the scheme of forming a complete automobile exhaust gas detection system with other equipment 1. Introduction With the increasing number of automobiles, automobile exhaust pollution also increases. It has become increasingly apparent that all countries in the world have issued relevant standards for this issue, and my country has also issued relevant laws and regulations to limit vehicle exhaust emissions according to specific circumstances. Whether domestic or foreign, automobile manufacturers have successively developed testing equipment for automobile exhaust. This kind of equipment not only has the function of analyzing whether the exhaust gas of the automobile conforms to the relevant national standards, but also has the function of analyzing the failure of the automobile engine, and can also be used as an important tool for testing the performance of the automobile. The following is an introduction to the TF100 thermal mass flowmeter applied in the 'Automotive Comprehensive Parameter Detection System' developed by Shanghai BYD Company with independent copyright. 2. Introduction of TF100 thermal mass flowmeter TF100 thermal mass flowmeter is a special measuring instrument for automobile exhaust gas measurement by SAISORS (China). SAISORS has nearly 20 years of successful experience in gas quality measurement. SAISORS (China) has also successfully operated in China for nearly three years, and has rich experience in gas measurement. In the application of the 'Automotive Comprehensive Parameter Detection System' project, our company has successively adopted a certain foreign brand and a certain domestic brand of thermal gas mass flowmeters. Both the actual measurement results and theoretical data are too different, and the application effect is not good. ideal. The TF100 product produced by SAISORS (China) Company is a special product for automobile exhaust. The effect of using this product is ideal, and it has reached our design accuracy. Actual product pictures. Features: The probe rod has a scale, which is easy to install; split design (50 meters), suitable for high temperature applications; stable and reliable, high precision; suitable for applications in high temperature, high humidity, and dirty gas places; main principle: The engine of the car is at different speeds The exhaust volume, exhaust pressure, and gas temperature are different, according to which the engine performance of the car can be calculated. According to the gas analysis probe inserted into the pipeline, the exhaust gas of the vehicle at different speeds can be analyzed, so as to determine whether the vehicle emission meets the relevant industry standards. Among them, the thermal mass flowmeter is responsible for the important work, responsible for the exhaust volume, temperature measurement, and pressure measurement. These data are also important parameters for measuring the working ability of the engine, and also an important basis for the maintenance of the majority of automobile maintenance personnel. As we all know, exhaust gas measurement is relatively complicated, and its composition measurement and exhaust volume measurement are very important to the performance of the engine and the whole machine. Therefore, to ensure the accuracy of the system is 3%, it is necessary to ensure the accuracy of each function of the system. Through our actual testing, our initial design accuracy has been achieved. 2.1 Principle of thermal gas mass flowmeter The probe has two probes, one is a heating probe, which contains high-precision PT20 resistance; the other is a reference probe, which contains high-precision PT1000 resistance. The heating probe measures the wind speed; the reference probe measures the temperature of the wind speed. We know that thermal mass flow meters are based on thermal diffusion technology. The probe inserted into the fluid will lose the heat of the heated flow probe due to the influence of the flow velocity of the medium. Then, the relationship between its heat loss and the mass flow of the fluid can be expressed by the following mathematical model: P/△T= A+B(Q)m————————————(1) Among them: P represents the power consumption, △T represents the temperature difference between the two probes, Q represents the mass flow rate, m represents the exponential coefficient, and A and B are constants related to the physical properties of the gas. From formula (1), it can be seen that the ratio of the power of the heating probe to the temperature difference is the mass flow of the fluid. If we keep the ΔT constant and measure the flow of the fluid according to the relationship between the power consumption and the mass flow of the fluid, this method is called“constant temperature difference”Its advantages are: it is very sensitive at small flow points, the minimum can reach 0.05m/s, and it has good linearity; the velocity response is fast, and the minimum can reach 250ms. The range ratio is wide, generally greater than 100:1, but this principle also has shortcomings. The sensitivity of the range above 90m/s is poor, which also depends on the manufacturing process level of the sensor. 2.2 Installation of TF100 thermal gas mass flowmeter The installation of TF100 split thermal gas mass flowmeter is very simple.“Top ten and last five”the rules. We choose a DN80 pipe, weld a M27X1.5 base on the DN80 pipe, and screw it into the thread of the pipe with a locking head of the same specification with a probe.

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