EGR control method and system based on compressible gas equation
A technology of compressed gas and control method, applied in electrical control, charging system, engine control and other directions, can solve problems such as many engine adjustments, no control method, and always fluctuating stability, and achieve the effect of improving control accuracy
Active Publication Date: 2021-12-14
DONGFENG MOTOR CORP HUBEI
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Problems solved by technology
[0004] Invention patent CN103089460A "A closed-loop control system for engine EGR valve" proposed a closed-loop control method based on PID, but did not propose a specific control method
Moreover, not all systems need to adopt the closed-loop control method. Under the transient condition of the engine, the real-time conditions of the closed-loop may cause the engine to adjust too much and fluctuate all the time, which will affect the stability.
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[0037] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the implementation examples described here are only for illustration and explanation of the present invention, and are not intended to limit this invention.
[0038] This proposal provides an open-loop control based on the compressible gas equation at the ideal nozzle, with a target EGR opening of 0% when EGR is not active. When EGR is active, the control is based on the compressible gas equation at the ideal nozzle, as figure 1 As shown, it specifically includes the following steps:
[0039] Step 1. Obtain the amount of fresh air entering the cylinder and the final target EGR rate r EGRDESRD .
[0040] Wherein, the amount of fresh air entering the cylinder can be detected by a sensor, or obtained by usin...
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The invention discloses an EGR control method based on a compressible gas equation, comprising the following steps: S1, obtaining the fresh air flow rate entering the cylinder and the final target EGR rate; S2, calculating the target exhaust gas flow rate; S3, comparing the target exhaust gas flow rate and the preset minimum target value, calculate the target effective area of the EGR control valve according to the compressible gas equation, and set the opening degree of the EGR control valve. The invention applies the gas equation to engineering practice, corrects the effective area of the EGR control valve, and monitors the actual EGR rate in real time to correct the effective area of the EGR control valve, thereby improving the control accuracy of the EGR.
Description
technical field [0001] The invention relates to the field of engine exhaust recirculation rate control, in particular to an EGR control method and system based on a compressible gas equation. Background technique [0002] With the rapid development of the automobile and internal combustion engine industries, energy demand and environmental protection issues have become difficult problems faced by countries all over the world. Therefore, energy saving and emission reduction have become two major themes in the development of the internal combustion engine industry. In terms of energy saving, domestic and foreign automobile manufacturers use: Otto cycle, Atkinson cycle, Miller cycle, high-pressure exhaust gas recirculation (Exhaust Gas Recirculation, EGR) or low-pressure high-pressure exhaust gas recirculation Cycle and other technologies can improve the combustion and work process of the engine, or through the miniaturization design of the engine, the pumping loss of small and...
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IPC IPC(8): F02D41/00F02D41/24F02M26/20
CPCF02D41/0077F02D41/2451F02M26/20Y02T10/40
Inventor 秦龙刘磊岳永召
Owner DONGFENG MOTOR CORP HUBEI