A slope crawling assist control method for an automatic transmission
An automatic transmission and auxiliary control technology, which is applied in the direction of transmission control, toothed components, belts/chains/gears, etc., can solve problems such as unstable clutch pressure, abnormal flameout of automatic transmission vehicles, and slow clutch response. Achieve the effect of improving responsiveness, fast, smooth and stable clutch engagement function
Active Publication Date: 2016-02-03
ZHEJIANG GEELY HLDG GRP CO LTD +1
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Problems solved by technology
In the process of driving on a slope, the aging of the valve body in the clutch assembly, the viscosity change caused by the volatilization of engine oil and other factors may cause improper coupling of the clutch and unstable pressure of the clutch. These improper coupling methods of the clutch will cause automatic The transmission vehicle is abnormally stalled, the vehicle vibration is too intense during the clutch engagement process or the torque transmission is weak, and the clutch response is slow, etc.
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[0028] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.
[0029] The process of the vehicle crawling on a slope refers to the process in which the driver releases the brakes and does not step on the accelerator, and the vehicle travels slowly (vehicle speed is less than or equal to 4 km / h). In the process of driving on a slope, factors such as the aging of the valve body in the clutch assembly and the change in viscosity caused by volatilization of the engine oil may cause improper clutch engagement, resulting in unstable clutch pressure and excessive vibration of the vehicle during clutch engagement. Or the torque transmission is weak, the responsiveness of the clutch is slow and other problems. In addition, as the degree of clutch engagement gradually increases during the clutch engagement process, the friction between the clutch master and driven discs will increase, the clutch input torque will in...
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The invention provides a method for auxiliary control over ramp crawling of an automatic transmission and belongs to the technical field of automatic transmissions. The method comprises the steps that the gradient of the ground where a vehicle is located, the position of a gear rod, the braking pressure and the rotating speed of an engine are detected in real time and the braking pressure change rate and the difference value of the rotating speed of the engine and the target idle speed of the engine are calculated; according to the braking pressure change rate, the oil pressure of a clutch is controlled in advance. According to the method for auxiliary control over ramp crawling of the automatic transmission, the change of the braking pressure, a gradient signal and the dynamic difference value of the current rotating speed of the engine and the target idle speed of the engine serve as reference and the oil pressure of the clutch is controlled in advance, so that the pressure of the clutch is controlled in advance, the response degree of an executing mechanism of the clutch is improved, the rapid smooth stable clutch combination function is achieved, the probability of occurrence of flameout of the engine in the clutch combination process is effectively reduced when the vehicle crawls on a ramp, and the possibility of reverse sliding is reduced when the vehicle is driven on the ramp.
Description
technical field [0001] The invention belongs to the technical field of automatic transmissions, and relates to a transmission control method during climbing. Background technique [0002] In the existing automatic transmission, realizing the hill crawling function is a very important part of the clutch control strategy. The control strategy of clutch engagement is directly related to the smoothness and safety of vehicle power transmission. In the process of driving on a slope, the aging of the valve body in the clutch assembly, the viscosity change caused by the volatilization of engine oil and other factors may cause improper coupling of the clutch and unstable pressure of the clutch. These improper coupling methods of the clutch will cause automatic The transmission vehicle is abnormally stalled, the vehicle vibration is too intense during the clutch engagement process or the torque transmission is weak, and the clutch response is slow. Therefore, the engagement control ...
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IPC IPC(8): F16H59/66F16H59/54F16H59/74F16H59/70
CPCF16H59/54F16H59/66F16H59/74F16H61/0251F16H61/32F16H2059/663F16H2061/323F16H2312/06
Inventor 周一成陈勇罗大国刘文忠冯擎峰
Owner ZHEJIANG GEELY HLDG GRP CO LTD