A control method for preventing frequent shifting of automatic transmission

A technology of automatic transmission and control method, applied in the direction of transmission control, elements with teeth, belt/chain/gear, etc., to avoid frequent shifting

Active Publication Date: 2021-05-28
SHENGRUI TRANSMISSION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a control method for preventing frequent shifting of automatic transmissions, which overcomes the defects in the existing control methods. After adopting the control method of the present invention, it is avoided that when the automatic transmission is in use, when reaching the shift line Frequent gear shifting due to throttle opening or turbine speed fluctuations near the critical value reduces the number of times the automatic transmission clutch is used and prolongs the service life of the transmission

Method used

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  • A control method for preventing frequent shifting of automatic transmission
  • A control method for preventing frequent shifting of automatic transmission
  • A control method for preventing frequent shifting of automatic transmission

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Embodiment Construction

[0017] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that the following does not constitute a limitation to the protection scope of the present invention.

[0018] Examples such as figure 2 , image 3 As shown, a control method for preventing frequent shifting of automatic transmissions. The clutch is arranged inside the automatic transmission. It is completed by pressing the friction plate; the front end of the automatic transmission is equipped with a hydraulic torque converter, and the front and rear ends of the hydraulic torque converter are respectively the pump wheel (rigidly connected with the engine) and the turbine (rigidly connected with the input shaft). When the automatic transmission shifts gears, the hysteresis speed of a shift point...

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Abstract

The invention discloses a control method for preventing frequent shifting of an automatic transmission. When the automatic transmission is shifting, the hysteresis speed of a shift point is added to the calculation of the shift point, and the output shift point is greater than the calibrated upshift line and Upshift hysteresis speed n UP The sum or less than the calibrated downshift line and downshift hysteresis speed n DN The sum is to complete the shift. When the automatic transmission is shifting, a hysteresis speed of the shift line is added when calculating the shift point of the shift map, so as to avoid the throttle opening or Frequent gear changes caused by fluctuations in turbine speed.

Description

technical field [0001] The invention belongs to the technical field of automatic transmission control, and in particular relates to a control method for preventing frequent shifting of automatic transmissions. Background technique [0002] In the automatic mode (AUTO) of an automatic transmission (AT) with a hydraulic torque converter, the rules for shifting gears according to input signals such as turbine speed and throttle opening are called shift maps. When calculating the shift map, when the turbine speed and throttle opening fluctuate at the shift point, it will cause frequent shifts of the automatic transmission, such as figure 1 shown. [0003] In the process of realizing the present invention, the inventor found that the prior art has at least the following disadvantages: frequent shifting of gears during use of the transmission, increasing the number of times the clutch is used, and shortening the service life of the automatic transmission. [0004] At present, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/00F16H61/48F16H59/38F16H59/24
CPCF16H59/24F16H59/38F16H61/00F16H61/48F16H2059/385F16H2061/0012
Inventor 杨磊刘强曹永宗伟郭太民王洪志陈彦波李志宗王圣涛李杰
Owner SHENGRUI TRANSMISSION
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