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Automatic transmission shift quality improved via selective use of closed-loop pressure feedback control

A transmission, pressure technology, applied in the direction of transmission control, fluid-driven clutch, non-mechanical drive clutch, etc., can solve the adverse effects of operation changes, unexpected performance and other problems

Active Publication Date: 2012-07-11
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Performing transition transitions in a disordered or non-sequential manner may result in undesired performance, including adverse effects on drivability or occupant-perceived changes in vehicle operation

Method used

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  • Automatic transmission shift quality improved via selective use of closed-loop pressure feedback control
  • Automatic transmission shift quality improved via selective use of closed-loop pressure feedback control
  • Automatic transmission shift quality improved via selective use of closed-loop pressure feedback control

Examples

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Embodiment Construction

[0050] Referring now to the drawings, in which the figures are shown for the purpose of illustrating certain exemplary embodiments only and not for the purpose of limiting them, figure 1An exemplary clutch control system employing a modulating valve according to the present invention is schematically shown. Clutch control system 200 includes regulator valve 210 , pressure switch 240 , and hydraulic lines 270 , 272 , 274 , 276 , 278 , and 280 . Regulator valve 210 selectively controls the flow of pressurized hydraulic oil to and from hydraulically actuated clutches through movement of a selection mechanism (in the exemplary embodiment, spool valve plunger 220 ) within the regulator valve. The plunger 220 is selectively acted upon by the plunger's first end 222 and the plunger's second end 224, and the balance of forces determines the displacement position of the plunger within the regulator valve. The plunger 220 includes a plunger detail (or plunger detail) 226 (including hol...

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PUM

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Abstract

The present invention relates to an automatic transmission shift quality improved via selective use of closed-loop pressure feedback control. In particularly, a method to control a hydraulically actuated clutch in a transmission of a vehicle is provided, including monitoring a pressure in a hydraulic circuit providing pressurized fluid to the hydraulically actuated clutch with micro-electromechanical pressure sensor, providing a closed-loop feedback control command for a hydraulic control device providing the pressurized fluid to the hydraulic circuit based upon the monitoring pressure, and controlling the control device based upon the closed-loop feedback control command.

Description

technical field [0001] The present invention relates to a system and method for controlling an automatic transmission. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. [0003] Powertrains that utilize rotational input torque through the input shaft to drive an output shaft are known to employ transmissions to change gear states. Such rotational input torque may come, individually or in combination, from a number of devices including internal combustion engines, electric machines, or other similar devices capable of providing input torque. Such powertrains can be found in vehicular or non-vehicular applications. [0004] The operation of a powertrain requires the management of the numerous torque carrying shafts or connections in the aforementioned engine, electric machine, input shaft, output shaft and drive train. Switching between gear states in an auto...

Claims

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Application Information

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IPC IPC(8): F16H61/4008F16D25/06
CPCF16D2048/0281F16H59/68F16D2500/70406F16D48/066F16D48/02F16H2059/683F16H61/065F16D2500/3024F16D2048/0209F16H2061/0078F16D2500/7061F16H61/061
Inventor C.J.李P.G.奥塔尼斯F.萨米
Owner GM GLOBAL TECH OPERATIONS LLC
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