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Parameter identification method for engine mixed gas control system

A technology of parameter identification and control system, applied in the direction of engine control, electrical control, engine components, etc., can solve the problems of inconsistent parameters of the mixture control system, aging of parts, and poor closed-loop control effect.

Active Publication Date: 2021-07-09
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, each type of engine and the oxygen sensor have manufacturing differences, which lead to the inconsistency of the parameters T and τ of the mixture control system of each engine, and the aging and failure of parts will also cause changes in parameters. If the changes in these parameters cannot be accurately identified Then correct the control system parameters in time, then the closed-loop control effect will become worse, which will lead to worsening emissions

Method used

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  • Parameter identification method for engine mixed gas control system
  • Parameter identification method for engine mixed gas control system
  • Parameter identification method for engine mixed gas control system

Examples

Experimental program
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Effect test

Embodiment 1

[0058] like figure 2 As shown, this embodiment provides a method for identifying parameters of an engine mixture control system, including the following steps:

[0059] S11, the open-loop response of the engine mixture system composed of the engine and the oxygen sensor to the fuel injection command is equivalent to a hysteresis link and a first-order inertia link;

[0060] S12, by changing the fuel injection quantity of the engine injector, inputting the original sine wave mixture gas signal to the engine mixture system to obtain the sine wave exhaust gas air-fuel ratio signal;

[0061] S13. Comparing the amplitude and phase of the sine wave exhaust gas air-fuel ratio signal and the original sine wave mixture gas signal to obtain the lag time T of the lag link and the filter coefficient τ of the first-order inertia link.

[0062] In practical application, such as image 3 As exemplified in , the above-mentioned steps S11-S14 can be executed by a controller, but the present...

Embodiment 2

[0079] like Figure 4 As shown, this embodiment provides a method for identifying parameters of an engine mixture control system, including the following steps:

[0080] S21, the open-loop response of the engine mixture system composed of the engine and the oxygen sensor to the fuel injection command is equivalent to a hysteresis link and a first-order inertia link;

[0081] S22, generating a square wave signal, and then passing the square wave signal through a bandpass filter to obtain the original sine wave mixture signal and inputting it to the engine mixture system to obtain a sine wave exhaust gas air-fuel ratio signal;

[0082] S23. Comparing the amplitude and phase of the sine wave exhaust gas air-fuel ratio signal and the original sine wave mixture gas signal to obtain the lag time T of the lag link and the filter coefficient τ of the first-order inertia link.

[0083] In practical application, such as Figure 5 As exemplified in , the above-mentioned steps S21-S23 c...

Embodiment 3

[0087] like Figure 6 As shown, this embodiment provides a method for identifying parameters of an engine mixture control system, including the following steps:

[0088] S31, the open-loop response of the engine mixture system composed of the engine and the oxygen sensor to the fuel injection command is equivalent to a hysteresis link and a first-order inertia link;

[0089] S32, inputting an original square-wave mixture signal to the engine mixture system to obtain a square-wave exhaust gas air-fuel ratio signal;

[0090] S33, passing the original square-wave mixture signal through a band-pass filter to obtain an original sine-wave mixture signal, and passing the square-wave exhaust air-fuel ratio signal through a band-pass filter to obtain a sine-wave exhaust air-fuel ratio signal; and,

[0091] S34. Comparing the amplitude and phase of the sine wave exhaust gas air-fuel ratio signal and the original sine wave mixture gas signal to obtain the lag time T of the lag link and ...

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Abstract

The invention provides a parameter identification method for an engine mixed gas control system. The parameter identification method comprises the steps that open-loop response of the engine mixed gas control system composed of an engine and an oxygen sensor to an oil injection instruction is equivalent to a lag link and a first-order inertia link; an original sine wave mixed gas signal is input into the engine mixed gas system to obtain a sine wave exhaust gas air-fuel ratio signal, or an original square wave mixed gas signal is input into the engine mixed gas system to obtain a square wave exhaust gas air-fuel ratio signal, the original square wave mixed gas signal passes through a band-pass filter to obtain an original sine wave mixed gas signal, and the square wave exhaust gas air-fuel ratio signal passes through the band-pass filter to obtain a sine wave exhaust gas air-fuel ratio signal; and the amplitude and the phase of the sine wave exhaust gas air-fuel ratio signal are compared with the amplitude and the phase of the original sine wave mixed gas signal to obtain the lag time T of the lag link and the filter coefficient tau of the first-order inertia link, and the lag time T and the filter coefficient tau are used for parameter adjustment of a control algorithm in an air-fuel ratio control system.

Description

technical field [0001] The invention relates to the technical field of engine control, in particular to a method for identifying parameters of an engine mixture control system. Background technique [0002] With the continuous tightening of emission and fuel consumption regulations, more and more new technologies and products are applied to the engine. In order to meet the strict requirements of emission regulations on emissions, it is necessary to use a wide-area oxygen sensor for closed-loop control of fuel injection. like figure 1 As shown, there is a certain delay time T from the engine fuel injection to the wide-area oxygen sensor sensing the fuel injection signal (that is, λ). T is closely related to the engine combustion chamber, exhaust pipeline and operating conditions, while the wide-area oxygen sensor There is a process from the beginning of sensing the fuel injection signal to the correct reflection of the real air-fuel ratio. The length of this process is rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D41/14F02D45/00F02M65/00
CPCF02D41/0002F02D41/1454F02D41/1456F02M65/00F02D45/00Y02T10/40
Inventor 张松庄兵丁锋
Owner UNITED AUTOMOTIVE ELECTRONICS SYST