CN114922971B - Method and device for optimizing DCT gear shifting impact at low temperature - Google Patents
Method and device for optimizing DCT gear shifting impact at low temperature Download PDFInfo
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- CN114922971B CN114922971B CN202210432245.6A CN202210432245A CN114922971B CN 114922971 B CN114922971 B CN 114922971B CN 202210432245 A CN202210432245 A CN 202210432245A CN 114922971 B CN114922971 B CN 114922971B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 230000005540 biological transmission Effects 0.000 claims abstract description 24
- 238000005457 optimization Methods 0.000 claims abstract description 19
- 230000002159 abnormal effect Effects 0.000 claims description 9
- 230000035939 shock Effects 0.000 claims description 5
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000009193 crawling Effects 0.000 claims description 3
- 238000001816 cooling Methods 0.000 abstract description 3
- 230000002411 adverse Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 230000036461 convulsion Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/0403—Synchronisation before shifting
- F16H2061/0407—Synchronisation before shifting by control of clutch in parallel torque path
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H2061/0474—Smoothing ratio shift by smoothing engagement or release of positive clutches; Methods or means for shock free engagement of dog clutches
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/04—Smoothing ratio shift
- F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
- F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means
- F16H2061/062—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means for controlling filling of clutches or brake servos, e.g. fill time, fill level or pressure during filling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/84—Data processing systems or methods, management, administration
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention belongs to the technical field of automobiles, and particularly relates to a method and a device for optimizing DCT gear shifting impact at low temperature. Comprising the following steps: judging a low-temperature gear shifting working condition; judging gear shifting impact; and (5) gear shifting optimization. The low-temperature gear shifting condition judgment comprises gear shifting judgment and low-temperature condition judgment. The gear shifting optimization comprises two parts, namely clutch torque transmission optimization and clutch combination control optimization. By researching the clutch combining pressure, the clutch cooling control mode, the clutch dragging torque, the engine rotating speed and the clutch plate friction coefficient and analyzing the gear shifting impact source and the optimizing method, the gear shifting impact is effectively reduced, the gear shifting quality is improved, the problems of the gear shifting control such as the bump, the impact and the like are solved, and the problem of adverse effects on driving feeling is solved.
Description
Technical Field
The invention belongs to the technical field of automobiles, and particularly relates to a method and a device for optimizing DCT gear shifting impact at low temperature.
Background
Because of the continuous improvement of the development level of automobiles, the power and oil consumption difference of the whole automobile is reduced year by year, and the drivability and the comfort become the main aspects of the competition of the automobile industry. In order to improve the competitiveness of the drivability and the comfort of the whole vehicle, the drivability of the vehicle is evaluated through a development stage, and engineering targets are formulated and achieved. Gear shifting is easily perceived as a common condition in driving and is therefore extremely important in drivability assessment. Especially in low temperature environment, the transmission hardware is influenced by the characteristic change of the transmission hardware at low temperature, the gear shifting control is easy to generate problems such as jerk and impact, and bad influence is brought to driving feeling. Therefore, the improvement of the gear shifting quality at low temperature is particularly important.
Disclosure of Invention
The invention provides a method and a device for optimizing DCT gear shifting impact at low temperature, which analyze the source of gear shifting impact and the optimizing method by researching clutch combining pressure, clutch cooling control mode, clutch dragging torque, engine speed and clutch plate friction coefficient, effectively reduce gear shifting impact, improve gear shifting quality, solve the problems of the gear shifting control such as the occurrence of the jerk and the impact, and bring adverse effects to driving feeling.
The embodiment of the invention is described below with reference to the accompanying drawings:
the embodiment of the invention provides an optimization method of DCT gear shifting impact at low temperature, which comprises the following steps:
judging a low-temperature gear shifting working condition;
Judging gear shifting impact;
and (5) gear shifting optimization.
Further, the low-temperature gear shifting condition judgment comprises gear shifting judgment and low-temperature condition judgment.
Further, the gear shifting judgment is to judge whether the vehicle is in a gear shifting working condition or not through a gear shifting controller gear signal, a vehicle speed signal and an engine rotating speed signal.
Further, the low temperature condition determination is to comprehensively determine whether the engine is in a low temperature environment through the oil temperature of the transmission and the water temperature of the engine.
Further, the specific method for judging the gear shifting impact is as follows:
judging whether the vehicle has a bump or abnormal sound or not through signals acquired by the sensor, judging whether the vehicle rises when the vehicle starts, and judging that gear shifting impact exists when the vehicle has the bump or abnormal sound and rises when the vehicle starts;
And collecting the rotating speed of the engine, the torque of the engine, the target pressure of clutch control and the actual pressure of clutch control, analyzing whether the phenomenon of high rotating speed or low pulling exists during gear shifting, judging whether the torque fluctuates and the torque transmission is unstable, and judging that the clutch combination is impacted if the phenomenon of high rotating speed or low pulling exists, the torque fluctuates and the torque transmission is unstable.
Further, the gear shifting optimization comprises two parts, namely clutch torque transmission optimization and clutch combination control optimization.
Further, the specific method for optimizing the clutch torque transmission is as follows:
When the phenomenon that the rotation speed of an engine is reduced and the torque is reduced during the gear switching of the vehicle, the viscosity of the transmission oil at low temperature is high, the dragging torque is high, and the resistance of the whole vehicle at low temperature is high; by improving the idle crawling speed of the engine and the torque increasing request, the torque reserve at low temperature is improved, the idle torque control capability is improved, and the impact caused by severe torque change is prevented;
further, the specific method for optimizing the clutch combination control is as follows:
When the phenomenon of high engine speed exists during gear shifting of the vehicle, the phenomenon that the oil charge resistance of the transmission is increased at low temperature is analyzed, the deviation between the clutch control target pressure and the actual pressure is too large, and torque cannot be normally and efficiently transmitted, so that the engine speed is high; by reducing the flow, the clutch back pressure is reduced, the pre-compression force in the early stage of the gear shifting starting process is adjusted, and the vehicle is prevented from being shrugged or even abnormal sound caused by high rotating speed.
The embodiment also provides an optimizing device for DTC gear shifting impact at low temperature, comprising:
the low-temperature gear shifting judging module is used for judging whether the gear shifting is in a low-temperature gear shifting working condition or not;
The gear shifting impact judging module is used for judging whether gear shifting impact exists or not;
and the gear shifting impact optimizing module optimizes gear shifting impact.
The beneficial effects of the invention are as follows:
according to the invention, the gear shifting impact source and the optimization method are analyzed by researching the information such as clutch combination pressure, clutch cooling control mode, clutch dragging torque, engine speed, clutch plate friction coefficient and the like, so that the gear shifting impact is effectively reduced, and the gear shifting quality is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for optimizing DCT shift shock at low temperature according to the present invention;
FIG. 2 is a detailed analysis flow chart of a method for optimizing DCT shift shock at low temperature according to the present invention;
fig. 3 is a schematic structural diagram of a device for DCT shift impact at low temperature according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
Example 1
Referring to fig. 1 and 2, a method for optimizing a shift shock of a DCT at a low temperature includes the steps of:
step one, judging low-temperature gear shifting working conditions;
the low-temperature gear shifting condition judgment comprises gear shifting judgment and low-temperature condition judgment.
The gear shifting judgment is to judge whether the vehicle is in a gear shifting working condition or not through a gear shifting controller gear signal, a vehicle speed signal and an engine rotating speed signal.
The low temperature condition judgment is to comprehensively judge whether the engine is in a low temperature environment or not through the oil temperature of the transmission.
Step two, gear shifting impact judgment;
judging whether the vehicle has a bump or abnormal sound or not through signals acquired by the sensor, judging whether the vehicle rises when the vehicle starts, and judging that gear shifting impact exists when the vehicle has the bump or abnormal sound and rises when the vehicle starts;
And collecting the rotating speed of the engine, the torque of the engine, the target pressure of clutch control and the actual pressure of clutch control, analyzing whether the phenomenon of high rotating speed or low pulling exists during gear shifting, judging whether the torque fluctuates and the torque transmission is unstable, and judging that the clutch combination is impacted if the phenomenon of high rotating speed or low pulling exists, the torque fluctuates and the torque transmission is unstable.
And step three, gear shifting optimization.
The gear shifting optimization comprises two parts, namely clutch torque transmission optimization and clutch combination control optimization.
The specific method for optimizing the clutch torque transmission is as follows:
When the phenomenon that the rotation speed of an engine is reduced and the torque is reduced during the gear switching of the vehicle, the viscosity of the transmission oil at low temperature is high, the dragging torque is high, and the resistance of the whole vehicle at low temperature is high; by improving the idle crawling speed of the engine and the torque increasing request, the torque reserve at low temperature is improved, the idle torque control capability is improved, and the impact caused by severe torque change is prevented;
The specific method for optimizing the clutch combination control is as follows:
When the phenomenon of high engine speed exists during gear shifting of the vehicle, the phenomenon that the oil charge resistance of the transmission is increased at low temperature is analyzed, the deviation between the clutch control target pressure and the actual pressure is too large, and torque cannot be normally and efficiently transmitted, so that the engine speed is high; by reducing the flow, the clutch back pressure is reduced, the pre-compression force in the early stage of the gear shifting starting process is adjusted, and the vehicle is prevented from being shrugged or even abnormal sound caused by high rotating speed.
Example two
The embodiment of the invention provides an optimization device for DTC gear shifting impact at low temperature, which comprises the following components:
the low-temperature gear shifting judging module is used for judging whether the gear shifting is in a low-temperature gear shifting working condition or not;
The gear shifting impact judging module is used for judging whether gear shifting impact exists or not;
and the gear shifting impact optimizing module optimizes gear shifting impact.
Although embodiments of the present invention have been disclosed above, they are not limited to the use listed in the description and modes of implementation. It can be applied to various fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. Therefore, the invention is not to be limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (2)
1. The method for optimizing DCT gear shift impact at low temperature is characterized by comprising the following steps:
judging a low-temperature gear shifting working condition;
Judging gear shifting impact;
Gear shifting optimization;
The low-temperature gear shifting condition judgment comprises gear shifting judgment and low-temperature condition judgment;
the gear shifting judgment is to judge whether the vehicle is in a gear shifting working condition or not through a gear shifting signal, a vehicle speed signal and an engine rotating speed signal of a gear shifting controller;
The low temperature condition judgment is to comprehensively judge whether the engine is in a low temperature environment or not through the oil temperature of the transmission;
The specific method for judging the gear shifting impact is as follows:
judging whether the vehicle has a bump or abnormal sound or not through signals acquired by the sensor, judging whether the vehicle rises when the vehicle starts, and judging that gear shifting impact exists when the vehicle has the bump or abnormal sound and rises when the vehicle starts;
Collecting the rotating speed of an engine, the torque of the engine, the target pressure of clutch control and the actual pressure of clutch control, analyzing whether the phenomenon of high rotating speed or low pulling exists during gear shifting, judging whether the torque fluctuates and the torque transmission is unstable, and judging that the clutch combination is impacted if the phenomenon of high rotating speed or low pulling exists, the torque fluctuates and the torque transmission is unstable;
the gear shifting optimization comprises clutch torque transmission optimization and clutch combination control optimization;
The specific method for optimizing the clutch torque transmission is as follows:
When the phenomenon that the rotation speed of an engine is reduced and the torque is reduced during the gear switching of the vehicle, the viscosity of the transmission oil at low temperature is high, the dragging torque is high, and the resistance of the whole vehicle at low temperature is high; by improving the idle crawling speed of the engine and the torque increasing request, the torque reserve at low temperature is improved, the idle torque control capability is improved, and the impact caused by severe torque change is prevented;
The specific method for optimizing the clutch combination control is as follows:
When the phenomenon of high engine speed exists during gear shifting of the vehicle, the phenomenon that the oil charge resistance of the transmission is increased at low temperature is analyzed, the deviation between the clutch control target pressure and the actual pressure is too large, and torque cannot be normally and efficiently transmitted, so that the engine speed is high; by reducing the flow, the clutch back pressure is reduced, the pre-compression force in the early stage of the gear shifting starting process is adjusted, and the vehicle is prevented from being shrugged or even abnormal sound caused by high rotating speed.
2. The method for optimizing a low-temperature DCT shift shock according to claim 1, characterized by being implemented by an optimizing device for a low-temperature DCT shift shock, said optimizing device comprising:
the low-temperature gear shifting judging module is used for judging whether the gear shifting is in a low-temperature gear shifting working condition or not;
The gear shifting impact judging module is used for judging whether gear shifting impact exists or not;
and the gear shifting impact optimizing module optimizes gear shifting impact.
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| CN202210432245.6A CN114922971B (en) | 2022-04-22 | 2022-04-22 | Method and device for optimizing DCT gear shifting impact at low temperature |
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| CN202210432245.6A CN114922971B (en) | 2022-04-22 | 2022-04-22 | Method and device for optimizing DCT gear shifting impact at low temperature |
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| CN114922971B true CN114922971B (en) | 2024-05-14 |
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