Hill holding brake pressure as a function of hill gradient detected as a function of acceleration in a control system for automatic transmission
US5820515A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1997 |
| Grant date | Oct 13, 1998 |
| Priority date | — |
| Expiry date | Mar 26, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S477/901
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system for an automatic transmission having a hydraulic power transmission for transmitting the rotation of an engine to a gear shifter; a clutch to be applied, when a forward drive range is selected, for connecting the hydraulic power transmission and the gear shifter to one another; a one-way clutch to be locked, when the clutch is applied, for establishing a first forward speed of the gear shifter; a brake for locking the one-way clutch, when applied, to block the backward rotation of the output shaft of the gear shifter; a first hydraulic servo for applying the clutch when fed with an oil pressure; a second hydraulic servo for applying the brake when fed with an oil pressure; a stopping state detector that detects the stopping state of a vehicle by determining the vehicle speed is substantially 0, the accelerator pedal is in a released state and the foot brake pedal is depressed; a gradient detector that detects the gradient load of an uphill, as applied to the vehicle; and a controller that controls the oil pressure to be fed to the first and second hydraulic servos on the basis of the signals from the stopping state detector and the gradient detector. The controller…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.