Method of discharging transmission accumulator
US10704677B2 · kind B2 · utility
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2References
8Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 11, 2018 |
| Grant date | Jul 7, 2020 |
| Priority date | — |
| Expiry date | Nov 27, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/1252
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A transmission includes an accumulator to hold one of more shift elements in an engaged state while an engine is off. The transmission also includes a hydraulic park system that disengages park in response to engagement of two shift elements. In some circumstance, draining the accumulator in an uncontrolled manner in the presence of a failed valve may lead to unintentionally disengaging park. To avoid this, the accumulator is discharged in a controlled manner. Fluid is first transferred from the accumulator to a shift element apply chamber. Then, the fluid is vented from the shift element apply chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.