Method and device for preventing upstream mixed gas of gas compressor from condensing
A compressor and mixed gas technology, applied in the field of EGR, can solve problems such as blade damage, and achieve the effect of avoiding condensation.
Active Publication Date: 2021-04-30
ZHEJIANG YILI AUTO PARTS CO LTD +1
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Problems solved by technology
Due to the mixing of fresh air and recirculated exhaust gas upstream of the compressor, after condensation occurs, water droplets will accelerate into the compressor and cause damage to the blades
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Embodiment 1
[0073] This embodiment 1 provides a method and device for preventing the condensation of the mixed gas upstream of the compressor, such as figure 1 Place
[0074] As shown, the method includes the following steps:
[0075] S101. According to the current working condition of the engine, calculate the proportion of water vapor, the proportion of water vapor includes: a first proportion of water vapor, a second proportion of water vapor and a third proportion of water vapor, the first proportion of water vapor The proportion value is characterized by the proportion of water vapor in the recirculated exhaust gas environment χ e , the second water vapor ratio is characterized by the ratio χ of water vapor in the atmospheric environment a , the third water vapor ratio is characterized by the ratio of water vapor in the gas mixture environment upstream of the compressor χ m ;
[0076] S102. Calculate the limit value of the EGR rate according to the proportion of water vapor;
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The invention relates to a method and device for preventing upstream mixed gas of a gas compressor from condensing. The method comprises the steps that according to the current working condition of an engine, water vapor ratio values are calculated, the water vapor ratio values comprise the first water vapor ratio value, the second water vapor ratio value and the third water vapor ratio value, the first water vapor ratio value is represented as the ratio xe of water vapor in a recycled waste gas environment, the second water vapor ratio value is represented as the ratio xa of water vapor in an atmospheric environment, and the third water vapor ratio value is represented as the ratio xm of water vapor in an upstream mixed gas environment of the gas compressor; according to the water vapor ratio, the limit value of the EGR rate is calculated; the target value of the EGR rate is limited according to the limiting value of the EGR rate; according to the limited target value of the EGR rate, the actual flow of EGR is obtained; the limiting value of the EGR rate is adjusted according to the actual flow, so that the condensation phenomenon of the gas compressor is prevented. According to the method and the device, the condensation phenomenon in the upstream position of the gas compressor due to introduction of recycled waste gas can be avoided.
Description
technical field [0001] The invention relates to the technical field of EGR, in particular to a method and a device for preventing condensation of mixed gas upstream of a compressor. Background technique [0002] With the development of the economy, the automobile industry has also developed. The increase in the number of automobiles has also caused some problems, such as environmental pollution, energy depletion, etc., especially environmental pollution. Every year, the exhaust gas emissions of automobiles are very large, resulting in certain environmental pollution. [0003] At present, many automobile manufacturers adopt exhaust gas recirculation (Exhaust Gas Recirculation, EGR for short) technology. The exhaust gas is introduced into the intake pipe and mixed with fresh air, and enters the fuel chamber to participate in the combustion. An emission control technology. Since the exhaust gas contains a large amount of carbon dioxide, the carbon dioxide cannot be burned but ...
Claims
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IPC IPC(8): F02D41/00
CPCF02D41/0077F02D41/0072
Inventor 王文将刘义强金昶明钱鹏飞
Owner ZHEJIANG YILI AUTO PARTS CO LTD