Semi joint point judgment method and system of hydraulic automatic transmission clutch

A technology of automatic transmission and semi-joint point, which is applied in clutches, components with teeth, transmission control, etc., can solve problems such as inaccurate clutch half-joint points, and achieve the elimination of solenoid valve hysteresis, accurate positioning, and reduced charging. The effect of oil time

Active Publication Date: 2017-12-22
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this patent document does not consider the influence of transmission oil temperature and other factors on the clutch pressure, which will lead to inaccurate judgment of the half-engagement point of the clutch

Method used

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  • Semi joint point judgment method and system of hydraulic automatic transmission clutch
  • Semi joint point judgment method and system of hydraulic automatic transmission clutch
  • Semi joint point judgment method and system of hydraulic automatic transmission clutch

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Experimental program
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Embodiment Construction

[0017] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0018] figure 1 It is a schematic flowchart of a method for judging a half-engagement point of a hydraulic automatic transmission clutch provided by an embodiment of the present invention; figure 2 The principle diagram of the method for judging the half-engagement point of the hydraulic automatic transmission clutch provided by the embodiment of the present invention; image 3 The structural block diagram of the system for judging the half-engagement point of the hydraulic automatic transmission clutch provided by the embodiment of the present invention.

[0019] Such as figure 1 As shown, the embodiment of the present invention provides a method for judging the half-engagement point of the hydraulic automatic transmission clutch, including:

[0020...

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PUM

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Abstract

The invention provides a semi joint point judgment method of a hydraulic automatic transmission clutch. The method includes the steps that when a gear shifting requirement is detected, oil is inflated into a clutch with large pressure P1, and the actual clutch pressure and the turbine rotating speed change rate values at all moments are recorded; when the actual clutch pressure slowly rises along with time, the clutch pressure is reduced to P2, and oil inflation is continuously carried out; when the actual oil pressure reaches the preset scale value of P2, the P2 is gradually increased with delta P, and when the turbine rotating speed change rate becomes a negative value, the clutch pressure at the time is recorded and is semi joint point pressure. The invention further provides a semi joint point judgment system of the hydraulic automatic transmission clutch. By means of the semi joint point judgment method of the hydraulic automatic transmission clutch, quick and accurate pressure response in the clutch oil inflation process can be achieved, and impact caused by clutch pressure overshooting can be avoided.

Description

technical field [0001] The invention relates to the technical field of shift control of a hydromechanical automatic transmission, in particular to a method and system for judging a half-joint point of a clutch of a hydromechanical automatic transmission. Background technique [0002] The gear shifting of the hydromechanical automatic transmission is realized by simultaneously controlling the oil drain of the separation clutch and the oil filling of the coupling clutch. The quality of the clutch oil filling and oil drain process directly affects the shift quality. The clutch plate gap has been eliminated at the half-engagement point of the clutch, and the clutch is about to transmit torque. If the clutch half-joint point is too low, the shifting time will be prolonged and the engine will run away. If the clutch half-joint point is too high, it will cause shifting shock. Whether or not the clutch half-engagement point can be accurately located plays a vital role in the qualit...

Claims

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Application Information

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IPC IPC(8): F16H61/02F16H61/04F16D48/06
CPCF16D48/06F16D2500/3024F16D2500/50251F16D2500/70217F16D2500/70605F16H61/0265F16H61/065F16H2061/0474
Inventor 蔡文文庞学文吕二华
Owner CHINA FIRST AUTOMOBILE
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