Method and device for preventing condensation of mixed gas downstream of water-cooled cooler
A mixture and cooler technology, applied in the field of EGR, can solve the problems of regardless of atmospheric environment state parameters, regardless of combustion conditions, and high estimated temperature.
Active Publication Date: 2022-08-02
ZHEJIANG YILI AUTO PARTS CO LTD +1
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Problems solved by technology
This method is relatively simple, and does not consider the actual combustion conditions of the oil product and the engine, nor the atmospheric environment state parameters, so the dew point temperature cannot be accurately predicted, which may lead to a higher estimated temperature and affect the intake efficiency; a lower estimated temperature, produce condensation,
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Embodiment 1
[0071] The first embodiment provides a method for preventing the condensation of the mixed gas downstream of the water-cooled cooler, such as figure 1 As shown, the method includes the following steps:
[0072] S101. Obtain a first water vapor percentage value, a second water vapor percentage value, and an EGR rate according to the current operating condition of the engine, where the first water vapor percentage value is represented as a water vapor percentage value χ in the exhaust gas environment e , the second water vapor proportion value is characterized as the water vapor proportion value χ in the atmospheric environment a ;
[0073] S102. Calculate a third water vapor percentage value according to the first water vapor percentage value, the second water vapor percentage value and the EGR rate, where the third water vapor percentage value is represented as the downstream of the water-cooled cooler The proportion of water vapor in the mixed gas environment χ m ;
[007...
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The present invention relates to a method and device for preventing condensation of mixed gas downstream of a water-cooled cooler. The method includes the steps of: obtaining a first water vapor percentage value, a second water vapor percentage value and an EGR rate according to the current operating condition of the engine; The first water vapor percentage value, the second water vapor percentage value and the EGR rate are calculated, and the third water vapor percentage value is calculated. The third water vapor percentage value is represented as the water vapor percentage value χ in the mixed gas environment downstream of the water-cooled cooler m ; Calculate the saturated water vapor pressure in the mixed gas environment according to the third water vapor ratio value; obtain the current relative humidity according to the current working conditions; when the relative humidity meets the preset relative humidity, calculate the current water vapor pressure; The dew point temperature is calculated by the empirical formula; the water-cooled cooler is controlled according to the dew point temperature to prevent the condensation phenomenon of the water-cooled cooler. condensation phenomenon.
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 downstream of a water-cooled cooler. Background technique [0002] With the development of the economy, the automobile industry has also developed, and the increase in the number of automobiles has also led to some problems, such as environmental pollution, energy depletion, etc., especially environmental pollution. Every year, automobile exhaust emissions are very large, resulting in certain Environmental pollution. [0003] At present, exhaust gas recirculation (Exhaust Gas Reciruclation, EGR for short) technology is used in many automobile manufacturers. EGR technology is to lead part of the exhaust gas generated in the oil extraction engine or gasoline engine out of the exhaust pipe, and pass a control valve, such as an EGR valve. The exhaust gas is introduced into the intake pipe and mixed with fresh air, and it is ...
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