Electro-hydraulic control system for an electrically variable hybrid transmission
US7322899B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2005 |
| Grant date | Jan 29, 2008 |
| Priority date | — |
| Expiry date | Feb 2, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/1268
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A powertrain has an electrically variable hybrid transmission having an electro-hydraulic control system, plurality of electrical power units, and a plurality of torque transmitting mechanisms selectively engageable by the electro-hydraulic control system to provide four forward speed ranges, a neutral condition, an electric low and high speed mode, an electrically variable low and high speed mode, and a hill hold mode. The electro-hydraulic control system permits operation in the electrically variable low mode of operation if the electrical power is interrupted when the powertrain is operating in the first forward range, electric low speed mode, electrically variable low speed mode, and hill hold mode. Additionally, the system permits operation in the electrically variable high speed mode of operation if the electrical power is interrupted when the powertrain is operating in the second through fourth forward range, electric high speed mode, and electrically variable high speed mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.