CN-117685114-B - Control method and system for idle speed working condition of vehicle and vehicle

CN117685114BCN 117685114 BCN117685114 BCN 117685114BCN-117685114-B

Abstract

S1, acquiring current running parameters of a vehicle in real time, and judging whether the vehicle is in an idle working condition according to the current running parameters of the vehicle; if yes, executing step S2, and if not, continuously judging whether the vehicle is in an idle working condition. And S2, acquiring the current air intake mass of the engine and the current desorption flow of the carbon tank in real time, and calculating the current dimensionless factor parameters. And S3, determining the current vibration working condition of the vehicle according to the current dimensionless factor parameters and a preset vehicle vibration model, and controlling the current air inlet mass of the engine and the current desorption flow of the carbon tank according to the current vibration working condition of the vehicle so that the current vibration working condition of the vehicle is in a critical working condition or a non-shake working condition. Therefore, the shake caused by unstable combustion of the engine is solved, and the comfort and experience of a user are improved.

Inventors

ZHAO WENJIE
LIU TAO
WEI SHUANG
ZHANG YIBO
JIAO JIAO

Assignees

上海汽车集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20220905

Claims (10)

1. The control method for the idle speed working condition of the vehicle is characterized by comprising the following steps of: s1, acquiring current running parameters of a vehicle in real time, and judging whether the vehicle is in an idle working condition according to the current running parameters of the vehicle; if yes, executing step S2; If not, continuing to judge whether the vehicle is in an idle working condition; s2, acquiring the current air intake mass of the engine and the current desorption flow of the carbon tank in real time, and calculating the current dimensionless factor parameters according to the following formula: Wherein delta is the current dimensionless factor parameter, m Feeding in is the current air intake mass of the engine, the unit is kg/h and represents the air intake mass in unit time, Q Carbon (C) is the current desorption flow of the carbon tank, the unit is kg/h and represents the desorption flow in unit time; s3, determining the current vibration working condition of the vehicle according to the current dimensionless factor parameters and a preset vehicle vibration model, and controlling the current air inlet quality of the engine and the current desorption flow of the carbon tank according to the current vibration working condition of the vehicle so that the current vibration working condition of the vehicle is in a critical working condition or a non-shake working condition; The corresponding relation between the air intake mass of the engine and the desorption flow of the carbon tank and the vehicle vibration working condition is constructed in the preset vehicle vibration model, wherein the corresponding relation is that the vehicle vibration working condition is a shaking working condition when the ratio of the air intake mass of the engine to the desorption flow of the carbon tank is smaller than a first factor parameter threshold value, the ratio of the air intake mass of the engine to the desorption flow of the carbon tank is larger than or equal to the first factor parameter threshold value and smaller than a second factor parameter threshold value, the vehicle vibration working condition is a critical working condition when the ratio of the air intake mass of the engine to the desorption flow of the carbon tank is larger than or equal to the second factor parameter threshold value, the ratio of the air intake mass of the engine to the desorption flow of the carbon tank is a dimensionless factor parameter, and the first factor parameter threshold value is smaller than the second factor parameter threshold value.
2. The method for controlling the idle operation of the vehicle according to claim 1, wherein in the step S3, the current intake mass of the engine and the current desorption flow of the canister are controlled according to the current vibration operation of the vehicle, so that the current vibration operation of the vehicle is in the critical operation or the no-shake operation, comprising: if the current vibration working condition of the vehicle is the vibration working condition, acquiring the comprehensive performance influence parameter of the engine, and judging whether the comprehensive performance influence parameter is larger than an influence parameter threshold; If yes, the current air intake mass of the engine and the current desorption flow of the carbon tank are adjusted, so that the current dimensionless factor parameter is larger than or equal to the first factor parameter threshold and smaller than the second factor parameter threshold, and the current vibration working condition of the vehicle enters the critical working condition; If not, the current air intake mass of the engine and the current desorption flow of the carbon tank are adjusted so that the current dimensionless factor parameter is larger than or equal to the second factor parameter threshold, and the current vibration working condition of the vehicle enters the non-shake working condition.
3. The method for controlling the idle operation of the vehicle according to claim 2, wherein in the step S3, the current intake mass of the engine and the current desorption flow of the canister are controlled according to the current vibration operation of the vehicle, so that the current vibration operation of the vehicle is in the critical operation or the no-shake operation, further comprises: If the current vibration working condition of the vehicle is the critical working condition, acquiring the comprehensive performance influence parameter of the engine, and judging whether the comprehensive performance influence parameter is smaller than or equal to the influence parameter threshold; If yes, the current air intake mass of the engine and the current desorption flow of the carbon tank are adjusted, so that the current dimensionless factor parameter is larger than or equal to the second factor parameter threshold value, and the current vibration working condition of the vehicle enters the non-shake working condition; If not, keeping the current air intake mass of the engine and the current desorption flow of the carbon tank unchanged, so that the current vibration working condition of the vehicle is kept at the critical working condition; If the current vibration working condition of the vehicle is the non-shake working condition, the current air intake mass of the engine and the current desorption flow of the carbon tank are kept unchanged, so that the current vibration working condition of the vehicle is kept in the non-shake working condition.
4. A control method for vehicle idle conditions as recited in claim 3, wherein obtaining the integrated performance affecting parameter of the engine comprises: acquiring the number of parameters of the related data of the engine to be adjusted, wherein the numerical value before the parameter adjustment of each related data and the numerical value after the parameter adjustment of each related data; And determining the comprehensive performance influence parameters of the engine according to the number of the parameters, the numerical value before the parameter adjustment of each parameter of the related data and the numerical value after the parameter adjustment of each parameter of the related data.
5. The method of controlling idle conditions of a vehicle of claim 4, wherein the integrated performance affecting parameter of the engine is determined according to the following equation: Wherein f (X) is the comprehensive performance influencing parameter, n is the number of the parameters, X i0 is the value before the adjustment of the ith parameter of the related data, and X i is the value after the adjustment of the ith parameter of the related data.
6. The method for controlling idle conditions of a vehicle according to claim 2, wherein the influencing parameter threshold is 0.05.
7. A control method for idle conditions of a vehicle according to any one of claims 1 to 6, wherein the control method is adapted to idle conditions in a plateau environment.
8. The method for controlling idle operation of a vehicle according to claim 7, wherein the preset vehicle vibration model includes a correspondence between the intake mass of the engine and the desorption flow of the canister and the vehicle vibration operation when the vehicle is in different altitude environments under the idle operation.
9. A control system for vehicle idle conditions, characterized by performing a control method for vehicle idle conditions according to any one of claims 1-8, the control system comprising: the acquisition device is used for acquiring current running parameters of the vehicle, current air intake mass of the engine and current desorption flow of the carbon tank in real time; The judging device is connected with the acquiring device and is used for judging whether the vehicle is in an idle working condition or not according to the running parameters acquired by the acquiring device; the calculating device is connected with the acquiring device and is used for calculating the current dimensionless factor parameters according to the following formula: wherein delta is the current dimensionless factor parameter, m Feeding in is the current air intake mass of the engine, the unit is kg/h and represents the air intake mass in unit time, Q Carbon (C) is the current desorption flow of the carbon tank, the unit is kg/h and represents the desorption flow in unit time; The control device is connected with the computing device and is used for determining the current vibration working condition of the vehicle according to the current dimensionless factor parameter and a preset vehicle vibration model, and controlling the current air inlet quality of the engine and the current desorption flow of the carbon tank according to the current vibration working condition of the vehicle so that the current vibration working condition of the vehicle is in a critical working condition or a non-shake working condition; The corresponding relation between the air intake mass of the engine and the desorption flow of the carbon tank and the vehicle vibration working condition is constructed in the preset vehicle vibration model, wherein the corresponding relation is that the vehicle vibration working condition is a shaking working condition when the ratio of the air intake mass of the engine to the desorption flow of the carbon tank is smaller than a first factor parameter threshold value, the ratio of the air intake mass of the engine to the desorption flow of the carbon tank is larger than or equal to the first factor parameter threshold value and smaller than a second factor parameter threshold value, the vehicle vibration working condition is a critical working condition when the ratio of the air intake mass of the engine to the desorption flow of the carbon tank is larger than or equal to the second factor parameter threshold value, the ratio of the air intake mass of the engine to the desorption flow of the carbon tank is a dimensionless factor parameter, and the first factor parameter threshold value is smaller than the second factor parameter threshold value.
10. A vehicle comprising the vehicle idle condition control system of claim 9.

Description

Control method and system for idle speed working condition of vehicle and vehicle Technical Field The invention belongs to the technical field of intelligent control of vehicles, and particularly relates to a control method and system for idle speed working conditions of a vehicle and the vehicle. Background Vehicle idle jerk is an important factor affecting vehicle comfort. For idle shake problems in plain environments, this is generally addressed by replacing a suspended or Dual mass flywheel (Dual MASS FLYWHEEL, DMF). For the vehicle with the suspension element, due to factors such as manufacturing and assembling of the suspension element, certain deviation of rigidity values and the self durable aging factor are caused, and the rigidity fluctuation can reach 10-20%. Thus, the problem of idle shake caused by a change in suspension stiffness can be solved by replacing the suspension. Further, for a vehicle with DMF, i.e., a dual mass flywheel, since DMF itself has an unbalance amount, idle shake may be caused when the unbalance amount is large. Manufacturing variations in DMF itself, coupled with vehicle durability factors, tend to result in further DMF imbalance. Therefore, the problem of idle shake caused by the variation of DMF unbalance can be solved by replacing DMF. However, the problem of idle shake in the plateau environment cannot be completely solved by simply replacing hardware. The engine is easy to tend to be in an unstable state because the air in the plateau environment is thin and the oxygen content in the air with the same volume is low, so that the truly effective oxygen content in the engine cylinder is much lower than that in plain areas under the condition of the same rotating speed and the same air inflow, and when the engine is unstable in combustion, the engine shake can be increased, further jitter complaints of passengers in the vehicle are caused, and riding comfort is affected. Although each large main engine factory has solved the combustion problem caused by the lower air-fuel ratio under the plateau by controlling the fuel injection quantity of the plateau area through an electronic control unit (Electronic Control Unit, ECU), the condition that the vehicle is in jitter caused by unstable engine combustion under certain special working conditions cannot be avoided. Further, the engine combustion is more prone to instability under idle off air conditioning conditions in a plateau environment of an automobile because the idle speed and load are lower and the intake air amount is more prone to be insufficient compared to on air conditioning conditions. At this time, if the carbon tank is flushed with a large flow, the gasoline vapor adsorbed on the activated carbon tank is sucked into the intake manifold, which corresponds to the increase of the concentration of the mixed gas in the intake duct, the insufficient intake superposition gas is enriched, the air-fuel ratio of the engine is further reduced, the unstable combustion state of the engine is further aggravated, the engine shakes and is conducted into the vehicle, and the uncomfortable feeling of passengers in the vehicle is caused. Patent publication No. CN113062820A discloses an automobile idle speed anti-shake device and a control method. The device and the method can provide extra air inflow for the engine, further improve the rotating speed of the engine and solve the vehicle shaking phenomenon in an idle state. However, the device and the method of the patent cannot solve the problem of idle shake caused by unstable engine combustion of the vehicle in a plateau environment. Disclosure of Invention The invention aims to solve the problem of vehicle idling shake caused by unstable combustion of an engine in the prior art. The vehicle idling condition control method, the vehicle idling condition control system and the vehicle are provided, and when the vehicle is in an idling condition, the combustion function of the engine is stable by adjusting the related data of the combustion of the vehicle engine, shaking cannot be generated under the idling condition, and the experience of a user is improved. In order to solve the technical problems, the embodiment of the invention provides a control method for idle speed working conditions of a vehicle, which comprises the following steps: S1, acquiring current running parameters of a vehicle in real time, and judging whether the vehicle is in an idle working condition according to the current running parameters of the vehicle; if yes, executing step S2; If not, continuing to judge whether the vehicle is in an idle working condition; s2, acquiring the current air intake mass of the engine and the current desorption flow of the carbon tank in real time, and calculating the current dimensionless factor parameters according to the following formula: Wherein delta is the current dimensionless factor parameter, m Feeding in is the current air intake mass of the engine, the unit is