Engine-bench-test air-feeding-and-discharging and air-leakage detection method

Abstract

The invention relates to the field of engine performance measurement, in particular to an engine bench test method. According to an engine-bench-test air-feeding-and-discharging and air-leakage detection method, an air leakage factor is 1 in the standard state of completely free of air leakage; an air leakage factor is the ratio of the speculated fuel consumption amount and the real-time collected actual fuel consumption amount, the speculated fuel consumption amount is calculated by the total substance quantity entering an engine in theory in cooperation with C balance after the discharged-air C content is detected by a measuring instrument, and the air leakage phenomenon is judged according to the air leakage factor. According to the engine-bench-test air-feeding-and-discharging and air-leakage detection method, the theoretical value of the fuel consumption amount calculated by carbon balance through the total substance quantity entering the engine in theory and the C content in discharged air, then the theoretical value is compared with the actual measured value, the air leakage phenomenon suddenly appearing on the air feeding side or the air discharging side in the test process can be monitored in real time through the deviation degree and the deviation direction, test errors caused by air leakage are eliminated, the test cycle is shortened, the test accurate rate is increased, and the research-and-development cost is reduced.

Description

technical field [0001] The invention relates to the field of engine performance measurement, in particular to an engine bench test method. Background technique [0002] When the engine bench test system is used for the engine bench test, because the system will use many transfer pipes at the intake and exhaust ends of the engine to connect to the relevant test equipment, because these transfer pipes are all temporary connections, Therefore, the sealing performance cannot be guaranteed, causing air leakage in the intake and exhaust system of the engine often occurs during the bench test, and the intake and exhaust volume of the engine have a significant impact on the results of measured parameters such as torque, burst pressure, exhaust back pressure, and gas discharge. Certainly affected. [0003] In order to avoid air leakage affecting the accuracy of the test results, in the prior art, the system is usually pressurized before the test, and then soapy water is sprayed on t...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a method for detecting air intake and exhaust air leakage in an engine bench test. The method uses the total amount of substances entering the engine and the C content in the exhaust gas to calculate the theoretical value of fuel consumption by carbon balance. Then compare the theoretical value with the actual measured value, realize the monitoring of the sudden air leakage phenomenon in the test process, solve the defect that the air leakage error cannot be eliminated in the prior art, and reduce the research and development cost

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