Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Fluid controlled mechanical clutch or brake
Patent
1998-08-26
1999-10-12
Wright, Dirk
Planetary gear transmission systems or components
Fluid drive or control of planetary gearing
Fluid controlled mechanical clutch or brake
477 86, 477176, 701 67, 475128, F16H 6108
Patent
active
059646756
ABSTRACT:
A system for controlling gear (gear ratio) shifting in an automatic transmission mounted on a vehicle, including a shift control means for generating a shift command to upshift from one gear (gear ratio) currently established to a next gear (gear ratio) by determining a command to the solenoid valves to discharge the pressurized oil from the frictional engaging elements that establish the current gear (gear ratio) so as to slip-control the frictional engaging elements, and to charge the pressurized oil to the frictional engaging elements that establish the next gear (gear ratio) to be shifted to. The system includes a first step for determining the command such that an actual slip rate of the frictional engaging elements that establish the current gear (gear ratio) converges to a first desired slip rate, a second step for determining the command such that the actual slip rate of the frictional engaging elements that establish the current gear (gear ratio) converges to a second desired slip rate, maximum slip rate detecting means for detecting a maximum actual slip rate, slip rate difference calculating means for calculating a difference between the detected maximum actual slip rate and the second desired slip rate, command correcting means for correcting the command in response to the calculated difference, and command storing means for storing the corrected command to be used as the command in the first step in controlling a next upshift. This arrangement can avoid the clutches (and brakes) from being suffered excessive slippage, thereby improving the service life of the clutches and brakes and making the control to smooth shift to that for the next gear (gear ratio).
REFERENCES:
patent: 5305663 (1994-04-01), Leonard et al.
patent: 5370016 (1994-12-01), Fujita et al.
patent: 5520586 (1996-05-01), Brown et al.
patent: 5613583 (1997-03-01), Kono et al.
patent: 5627750 (1997-05-01), Kono et al.
patent: 5697867 (1997-12-01), Kono et al.
patent: 5719768 (1998-02-01), Tashiro et al.
patent: 5749061 (1998-05-01), Kono et al.
patent: 5779595 (1998-07-01), Kono et al.
patent: 5857443 (1999-01-01), Kono et al.
Sekine Noboru
Shimada Takamichi
Honda Giken Kogyo Kabushiki Kaisha
Kwon Peter T.
Wright Dirk
LandOfFree
Gear ratio shift control system for automatic vehicle transmissi does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Gear ratio shift control system for automatic vehicle transmissi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gear ratio shift control system for automatic vehicle transmissi will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-646984