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Method and apparatus for adaptive control of power-on downshifts in an automatic transmission

A technology of automatic transmission and transmission, which is applied in the direction of transmission control, mechanical equipment, components with teeth, etc., and can solve problems such as the reduction of shifting quality

Inactive Publication Date: 2006-04-26
GENERAL MOTORS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, each transmission's manufacturing tolerances, variations due to wear, fluctuations in oil quality and temperature, etc. can lead to degraded shift quality

Method used

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  • Method and apparatus for adaptive control of power-on downshifts in an automatic transmission
  • Method and apparatus for adaptive control of power-on downshifts in an automatic transmission
  • Method and apparatus for adaptive control of power-on downshifts in an automatic transmission

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Embodiment Construction

[0026] The control of the present invention is described in the context of a multi-ratio power transmission having a planetary gear set of the type described in U.S. Patent No. 4,070,927 to Polak and having an electrohydraulic control of U.S. Patent No. 5,601,506 to Long et al. The full text of the two patents is attached herewith for reference. Accordingly, the gear set and control elements shown in Figure 1 have been greatly simplified, and it should be understood that information on fluid pressure routing, etc., can be found in the aforementioned patent.

[0027] Referring to FIG. 1 , reference numeral 10 generally refers to a vehicle powertrain including an engine 12 , a transmission 14 , and a torque converter 16 providing hydraulic engagement between the engine 12 and a transmission input shaft 18 . It should be noted that while the invention is described for use with a conventional engine 12, alternative power sources, such as electric motors or hybrid electric / gas fuel...

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Abstract

The present invention provides a method and apparatus for mathematically calculating an initial value of an adaptive parameter and thereafter for adaptive control of power-on downshifts in an automatic transmission, wherein diagnosis and correction are made during subsequent power-on downshifts Transmission deviation during shifting. The present invention works by monitoring transmission characteristics, including input speed, output speed, and shift duration during power-on downshifts, and identifying deviations from acceptable patterns. Each type of deviation requires a specific remedy, and appropriate adjustments are calculated based on the number and / or pressure of a command, by changing one or more initial states for the next shift of the same type said adjustment. The adjustment can be large so that the correction is fully or mostly implemented at the next gear change. Instead, small increments may be necessary to avoid overcorrection.

Description

technical field [0001] The present invention relates to a method and apparatus for improving power-on downshifts of an automatic transmission. Background technique [0002] Generally, a motor vehicle automatic transmission includes a number of gear members that engage its input and output shafts, and an associated number of torque-building devices, such as clutches and brakes, that are selectively engaged to activate certain gear members so that torque between the input and output shafts to establish the desired speed ratio. As used herein, the terms "clutch" and "torque transmitting device" are used to refer to brakes as well as clutches. [0003] The transmission input shaft is connected to the vehicle's engine through a fluid coupling such as a torque converter, while the output shaft is directly connected to the wheels. Shifting from one forward speed ratio to another is accomplished in response to engine throttle and vehicle speed, and generally involves clutch releas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H59/14
CPCF16H61/061F16H63/502F16H2061/0087F16H2306/44F16H2306/52
Inventor M·D·怀顿R·L·威廉斯
Owner GENERAL MOTORS CORP