Method for measuring recirculation rate of engine exhaust gas

A measurement method and engine technology, which is applied in engine control, machine/engine, electrical control, etc., can solve problems such as inability to accurately calculate EGR rate and small pressure difference of EGR valve, and achieve the effect of reducing cost and ensuring calculation accuracy

Active Publication Date: 2017-01-25
SHANGHAI JIAO TONG UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

The invention mainly solves the problem that when the engine uses low-pressure cooling EGR, the EGR rate cannot be accurately calculated by the traditional formula because the pressure difference between the two ends of the EGR valve is too small

Method used

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  • Method for measuring recirculation rate of engine exhaust gas
  • Method for measuring recirculation rate of engine exhaust gas
  • Method for measuring recirculation rate of engine exhaust gas

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Embodiment Construction

[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in combination with specific examples and with reference to the accompanying drawings.

[0033] see first figure 1 , figure 1 It is a schematic diagram of the EGR circuit of the measurement example 1 of the exhaust gas recirculation rate of the engine of the present invention. As can be seen from the figure, the measuring method of engine EGR rate of the present invention, the method may further comprise the steps:

[0034] 1) Use an air flow meter to measure the intake air flow Mair of the engine;

[0035] 2) Temperature and pressure sensors are respectively installed before and after the EGR valve. The EGR valve opening is controlled by the vehicle engine control unit, and the temperature and pressure sensors are used to measure the pressure Pb and temperature Tb of the exhaust gas inlet of the EGR valve and...

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Abstract

The invention discloses a measurement method of engine EGR rate, comprising the steps of measuring air intake flow of engine by air flow meter; installing temperature and pressure sensors in front of and behind EGR valve respectively whose openness is controlled by control unit of auto engine to measure pressure Pb and temperature Tb at inlet of waste gas of EGR valve and pressure Pa and temperature Pa at outlet of exhaust gas of EGR valve; calculating flow of exhaust gas, etc. The engine EGR rate measurement method greatly reduces measuring error of EGR rate in lower pressure difference between in front of and behind EGR valve.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a method for measuring the EGR rate of an engine. Background technique [0002] Exhaust gas recirculation (EGR) means that the engine control unit (ECU) properly opens the EGR valve according to the parameters of the engine such as speed, load, temperature, intake air flow, etc., so that the exhaust gas enters the intake system through the EGR valve. After the fresh air is mixed, it re-enters the engine cylinder for combustion. Exhaust gas recirculation has become a popular engine technology because it can improve fuel economy and reduce emissions at the same time. External cooling EGR is beneficial to the engine to reduce fuel consumption and emissions, but if the control is not good, too much or too little EGR rate will lead to deterioration of the engine working condition. The existing EGR rate measurement and calculation methods mainly include the following methods: [000...

Claims

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Application Information

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IPC IPC(8): F02D41/00
CPCF02D41/0072F02D2041/0075
Inventor许敏高弈尹鹏周建华
OwnerSHANGHAI JIAO TONG UNIV