CN-117072336-B - Judgment optimization method and device for idle shake of gasoline engine caused by residual waste gas

CN117072336BCN 117072336 BCN117072336 BCN 117072336BCN-117072336-B

Abstract

The invention relates to the technical field of engine control, in particular to a judging and optimizing method and device for idling shake of a gasoline engine caused by residual waste gas. And acquiring idling shake information and judging whether the idling shake information meets the condition of the gasoline engine caused by unstable combustion, if so, judging whether the idling shake is caused by residual waste gas according to a cylinder pressure characteristic curve and a maximum detonation pressure peak angle in the gasoline cylinder, and if so, debugging by improving the air inlet pressure of the gasoline engine and synchronously pushing the ignition angle backwards, thereby realizing the optimization process. According to the invention, the idling shake type caused by unstable combustion is discriminated, the cylinder pressure characteristic curve is analyzed, if the cylinder combustion speed of a certain gasoline cylinder shows a low-high-low-high alternation phenomenon, the residual waste gas amount can be judged as a key factor for influencing shake, and based on the judgment, the adjustment can be carried out by increasing the air inlet pressure and synchronously pushing the ignition angle backwards, so that the judgment and optimization method is simple and convenient, and the consumption period is short.

Inventors

HUANG FENG
LIAO SHANBIN
ZENG XIAOCHUN
WANG XILI
WANG YI
XU XIAOXIANG

Assignees

江铃汽车股份有限公司

Dates

Publication Date: 20260512
Application Date: 20230824

Claims (5)

1. A judging and optimizing method for the idling shake of a gasoline engine caused by residual waste gas is characterized by comprising the following steps: step S100, defining idle shake types including irregular shake, half-order continuous shake, first-order continuous shake and second-order continuous shake, wherein the standards of the second-order continuous shake types are as follows: the driver or the passenger sits at the main driver seat or the auxiliary driver seat, and the symptom of feeling tingling caused by the continuous shaking of the vehicle is the coincidence of the second-order continuous shaking; step S200, collecting idle shake information and judging whether the condition of the idle shake of the gasoline engine caused by unstable combustion is met, if yes, jumping to step S300, and if not, jumping to step S700, wherein the steps of collecting the idle shake information and judging whether the condition of the idle shake of the gasoline engine caused by unstable combustion is met comprise the following steps: step S210, evaluating collected idling shake characteristic shake information based on an idling condition of a vehicle; Step S220, judging whether the second-order continuous shake type is met, if not, meeting the condition of idling shake of the gasoline engine caused by unstable combustion; step S300, verifying whether combustion in a gasoline cylinder is stable, if so, jumping to step S200, if not, jumping to step S400, specifically, constructing a judgment optimization scene of idle speed shake of the gasoline engine caused by residual waste gas, comprising the steps of installing sensor equipment, detaching an original spark plug of the gasoline engine, installing a spark plug type cylinder pressure sensor, leading out the spark plug type cylinder pressure sensor at a crank shaft position sensor by a signal wire, connecting the spark plug type cylinder pressure sensor with a combustion analyzer to obtain a crank shaft rotating speed and a position signal, and reading the variation coefficient data of net indication average effective pressure in a single cycle in the gasoline cylinder by the combustion analyzer; step S400, collecting and analyzing signals on line, monitoring the cylinder pressure characteristic curve in the gasoline cylinder under the idle working condition in real time through a combustion analyzer, analyzing according to the cylinder pressure characteristic curve in the gasoline cylinder under the idle working condition, observing the combustion lag condition in each gasoline cylinder, and reading the maximum detonation pressure peak angle; Step S500, judging and determining whether idle speed shake is caused by residual waste gas, analyzing according to a cylinder pressure characteristic curve and a maximum detonation pressure peak angle in the gasoline cylinder, judging whether idle speed shake is caused by the residual waste gas, wherein the specific judging basis is whether the combustion lag of the gasoline cylinder exists in the cylinder pressure characteristic curve in the gasoline cylinder, if so, jumping to step S600, and if not, jumping to step S700, wherein the evaluation criterion of whether the combustion lag of the gasoline cylinder exists in the cylinder pressure characteristic curve in the gasoline cylinder is as follows: in one working cycle of the gasoline engine, under the condition of normal combustion, each cylinder has two pressure peaks, and if the crank angle corresponding to the subsequent pressure peak is larger, the combustion speed of the cylinder is slow, and combustion lag performance appears; Step S600, executing optimization operation, and debugging by improving the air inlet pressure and synchronizing the backward pushing ignition angle of the gasoline engine to realize the idling shake optimization process of the gasoline engine caused by residual waste gas; step S700 ends the gasoline engine idle shake optimization process for residual exhaust gas.
2. The method according to claim 1, wherein in step S300, the evaluation criterion for verifying whether the combustion in the gasoline cylinder is stable is whether the coefficient of variation of the net indicated average effective pressure in a single cycle is greater than 15%, and if so, the combustion in the gasoline cylinder is unstable.
3. The method according to claim 1, wherein in step S400, the maximum detonation pressure peak angle is a crank angle corresponding to the subsequent pressure peak.
4. A judgment optimizing apparatus for causing idling shake of a gasoline engine with respect to residual exhaust gas, characterized by being adapted to realize the judgment optimizing method as claimed in any one of claims 1 to 3, comprising: The definition module is used for defining idle shake types, including irregular shake, half-order continuous shake, first-order continuous shake and second-order continuous shake, wherein the standard of the second-order continuous shake type is as follows: the driver or the passenger sits at the main driver seat or the auxiliary driver seat, and the symptom of feeling tingling caused by the continuous shaking of the vehicle is the coincidence of the second-order continuous shaking; the screening module is used for collecting idle shake information and judging whether the condition of the idle shake of the gasoline engine caused by unstable combustion is met or not, and specifically comprises the following steps: Evaluating collected idling shake characteristic shake information based on an idling condition of the vehicle; Judging whether the second-order continuous shaking type is met, if not, meeting the condition of idling shaking of the gasoline engine caused by unstable combustion; The verification module is used for verifying whether combustion in the gasoline cylinder is stable or not, and specifically, a judgment optimization scene of idle speed shake of the gasoline engine caused by residual waste gas is constructed, the judgment optimization scene comprises sensor equipment installation, an original spark plug of the gasoline engine is detached, a spark plug type cylinder pressure sensor is installed, a signal wire is led out from a crank shaft position sensor, the spark plug type cylinder pressure sensor is connected with a combustion analyzer to obtain a crank shaft rotating speed and position signal, and the combustion analyzer is used for reading variation coefficient data of net indication average effective pressure in a single cycle in the gasoline cylinder; The analysis module is used for collecting and analyzing signals on line, monitoring the cylinder pressure characteristic curve in the gasoline cylinder under the idle working condition in real time through the combustion analyzer, analyzing according to the cylinder pressure characteristic curve in the gasoline cylinder under the idle working condition, observing the combustion lag condition in each gasoline cylinder, and reading the maximum detonation pressure peak value angle; The judging module is used for judging and determining whether idle speed shake is caused by residual waste gas, analyzing according to a cylinder pressure characteristic curve in the oil cylinder and a maximum detonation pressure peak angle, judging whether idle speed shake is caused by the residual waste gas, wherein the specific judging basis is whether the combustion lag of the oil cylinder exists in the cylinder pressure characteristic curve in the oil cylinder, and the combustion speed of the oil cylinder shows an alternating phenomenon between low and high, and the evaluation standard of whether the combustion lag of the oil cylinder exists in the cylinder pressure characteristic curve in the oil cylinder is as follows: in one working cycle of the gasoline engine, under the condition of normal combustion, each cylinder has two pressure peaks, and if the crank angle corresponding to the subsequent pressure peak is larger, the combustion speed of the cylinder is slow, and combustion lag performance appears; And the optimizing module is used for executing optimizing operation, and realizing the idling shake optimizing process of the gasoline engine caused by residual waste gas by improving the air inlet pressure of the gasoline engine and synchronously debugging the back-pushing ignition angle.
5. A computer storage medium having stored thereon a computer program, which when executed by a processor implements the judgment optimization method for the idling shake of a gasoline engine caused by residual exhaust gas according to any one of claims 1 to 3.

Description

Judgment optimization method and device for idle shake of gasoline engine caused by residual waste gas Technical Field The invention relates to the technical field of engine control, in particular to a judging and optimizing method and device for idling shake of a gasoline engine caused by residual waste gas. Background NVH performance is an important attribute requirement in the development design and testing of engine products. In the idling process of the gasoline engine, the engine load is smaller, the combustion uniformity is difficult to control, and the problem of shaking often occurs. Factors causing the problem of idle shake are many, in the aspect of source, the unreasonable fuel injection angle leads to the gas mixture inhomogeneous, the spark plug energy is low to lead to flame propagation speed slow, the ignition angle setting is too back to lead to combustion efficiency low, the unreasonable ignition angle deposit release slope leads to the difference of acting among each circulation big, the annex load is unstable, idle residual exhaust gas volume is big etc. all can cause the burning excitation unstable. The suspension system and the avoidance frequency requirement of engine excitation are mainly adopted on the path to reduce the sensitivity of the system. At present, each automobile manufacturer can carry out sweep frequency test on the fuel injection angle to comprehensively judge the combustion stability and emission index, and the ignition angle adjustment and accessory load calibration also belong to a common teaching method, but the influence of the residual waste gas amount factor is easy to ignore due to high test complexity. In the prior art, the method for judging whether the residual waste gas is a key factor is complex, the optimization means is few, a resistance thermometer with a small time constant is needed to be used, an exhaust manifold is modified, and then related equipment is connected to complete the test of the residual waste gas, so that the consumption period is long. Disclosure of Invention The present invention aims to at least ameliorate one of the technical problems of the prior art. Therefore, the invention provides a judging and optimizing method and device for idling shake of a gasoline engine caused by residual waste gas. According to an embodiment of the invention, a judgment optimization method for the idling shake of a gasoline engine caused by residual exhaust gas comprises the following steps: step S100, defining idle shake types including irregular shake, semi-order continuous shake, first-order continuous shake and second-order continuous shake; Step S200, collecting idle shake information and judging whether the condition of idle shake of the gasoline engine caused by unstable combustion is met, if yes, jumping to step S300, and if not, jumping to step S700; step S300, verifying whether combustion in a gasoline cylinder is stable, if so, jumping to step S200, if not, jumping to step S400, specifically, constructing a judgment optimization scene of idle speed shake of the gasoline engine caused by residual waste gas, comprising the steps of installing sensor equipment, detaching an original spark plug of the gasoline engine, installing a spark plug type cylinder pressure sensor, leading out the spark plug type cylinder pressure sensor at a crank shaft position sensor by a signal wire, connecting the spark plug type cylinder pressure sensor with a combustion analyzer to obtain a crank shaft rotating speed and a position signal, and reading the variation coefficient data of net indication average effective pressure in a single cycle in the gasoline cylinder by the combustion analyzer; step S400, collecting and analyzing signals on line, monitoring the cylinder pressure characteristic curve in the gasoline cylinder under the idle working condition in real time through a combustion analyzer, analyzing according to the cylinder pressure characteristic curve in the gasoline cylinder under the idle working condition, observing the combustion lag condition in each gasoline cylinder, and reading the maximum detonation pressure peak angle; Step S500, judging and determining whether idle speed shake is caused by residual waste gas, analyzing according to a cylinder pressure characteristic curve and a maximum detonation pressure peak angle in a gasoline cylinder, judging whether idle speed shake is caused by residual waste gas, specifically judging whether the combustion lag of the gasoline cylinder exists in the cylinder pressure characteristic curve in the gasoline cylinder, if so, jumping to step S600, and if not, jumping to step S700; Step S600, executing optimization operation, and debugging by improving the air inlet pressure and synchronizing the backward pushing ignition angle of the gasoline engine to realize the idling shake optimization process of the gasoline engine caused by residual waste gas; step S700 ends the gasoline engine idle shake optimizatio