Method and system for estimating fresh air flow into cylinder
A fresh air and cylinder technology, applied in the charging system, electrical control, exhaust gas recirculation, etc., can solve the problems of inaccurate calculation results, large errors, and inability to reflect the flow of fresh air, and achieve the effect of reducing errors.
Active Publication Date: 2022-02-18
DONGFENG MOTOR CORP HUBEI
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Problems solved by technology
[0004] However, the current estimation scheme of the conventional fresh air flow into the cylinder has a delay and cannot reflect the actual fresh air flow into the cylinder under transient conditions, resulting in inaccurate calculation results and large errors
Method used
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[0033] 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 used to illustrate and explain the present invention, and are not intended to limit this invention.
[0034] Such as figure 1 As shown, the system uses the estimated fresh air into the cylinder based on the fuel system
[0035] The principles of estimation are:
[0036] Among them, θ is the fitting parameter, STFT is the fuel short-term correction coefficient, LTFT is the fuel long-term correction coefficient, is the cylinder fresh air flow before fitting. The purpose of the fitting is to optimize the transient EGR estimation according to the fuel correction factors (short-term correction and long-term correction). Since the correction of the ideal f...
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The invention discloses a method for estimating the flow rate of fresh air entering a cylinder, comprising the following steps: S1, obtaining the flow rate of fresh air entering the cylinder before fitting; S2, judging whether the accuracy conditions of all fitting parameters are met, if If it is satisfied, proceed to S3, and if it is not satisfied, it is determined that the estimated fresh air flow into the cylinder is equal to the fresh air flow into the cylinder before fitting; the accuracy condition of the fitting parameter estimation is specifically: the engine speed exceeds the preset speed ; All cylinders are not cut off; the EGR control valve is closed or the pressure ratio before and after the throttle valve is less than the preset pressure ratio; S3, calculate the fitting parameters; S4, calculate and estimate the fresh air flow into the cylinder according to the fitting parameters . The invention can accurately estimate the flow of fresh air entering the cylinder, reflect the actual flow of fresh air entering the cylinder under transient working conditions, and reduce errors.
Description
technical field [0001] The invention relates to the field of engine exhaust gas recirculation rate control, in particular to a method and system for estimating the flow rate of fresh air entering a cylinder. 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 l...
Claims
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IPC IPC(8): F02D41/18F02D41/24F02D41/14F02M26/20F02M26/47
CPCF02D41/18F02D41/2493F02D41/1404F02M26/20F02M26/47
Inventor 秦龙王恺刘磊田丰民
Owner DONGFENG MOTOR CORP HUBEI