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Control method for variable-period downshift process of multi-gear-by-wire automatic transmission

A technology of automatic transmission and process control, applied in transmission control, components with teeth, belts/chains/gears, etc., can solve the problems of increasing control difficulty and complexity, high cost, and complex overall structure of the transmission.

Inactive Publication Date: 2017-02-15
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These hydraulic control mechanisms make the overall structure of the transmission complex, high cost and increase the difficulty and complexity of control

Method used

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  • Control method for variable-period downshift process of multi-gear-by-wire automatic transmission
  • Control method for variable-period downshift process of multi-gear-by-wire automatic transmission
  • Control method for variable-period downshift process of multi-gear-by-wire automatic transmission

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Embodiment Construction

[0037] Below in conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are described in detail. Obviously, the described embodiments are only part of the embodiments of the present invention, not all embodiments; based on the present invention Embodiments, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0038] A method for controlling a variable-period downshift process of a multi-gear automatic transmission by wire. The control device for realizing the multi-speed automatic transmission by wire according to the embodiment of the present invention includes an engine 200, a D gear switch D-SW, a vehicle speed sensor VSS, and an accelerator pedal position The sensor APS, the electronic control unit 100, the first gear electromagnetic clutch 41, the second gear electromagnetic clutch 42,...

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Abstract

The invention discloses a method for controlling the variable-period downshifting process of a multi-gear-by-wire automatic transmission. In the method, the electronic control unit detects the switch signal of the D gear, the vehicle speed signal v of the vehicle speed sensor, and the opening degree signal α of the accelerator pedal position sensor. Determine whether it is necessary to downgrade from the second gear to the first gear, from the third gear to the second gear, from the fourth gear to the third gear, and carry out the current control of the electromagnetic clutch in each downshift process. The downshifting process control method can not only avoid the interruption of the input power of the engine during the downshifting process, but also avoid the shock of shifting, and realize the smooth downshifting of the wire-controlled automatic transmission.

Description

technical field [0001] The invention relates to a control method of an automatic transmission, more precisely, a control method for a variable-period downshift process of a multi-speed wire-controlled automatic transmission. Background technique [0002] Automatic transmissions are widely used in various vehicles such as automobiles, electric vehicles, and construction machinery. The existing automatic transmissions mainly include hydromechanical automatic transmission (AT), metal belt continuously variable automatic transmission (CVT), mechanical automatic transmission (AMT) and dual clutch automatic transmission (DCT). [0003] The above-mentioned four types of automatic transmissions all adopt electronically controlled hydraulic servo devices to realize the control of the shifting process, which has complex structure, high cost and increased control difficulty and complexity. In particular, the executive mechanism of DCT includes: oil supply mechanism composed of hydraul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/32F16H61/02
CPCF16H61/0204F16H61/32F16H2061/326F16H2306/00
Inventor 王吉华曲金玉田香玉殷允朝
Owner SHANDONG UNIV OF TECH
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