Transmission fluid heating using engine exhaust
US7077776B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 15, 2004 |
| Grant date | Jul 18, 2006 |
| Priority date | — |
| Expiry date | Apr 4, 2024 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H57/0413
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A heat exchanger integrated into the transmission oil pan transfers heat from post-catalyst exhaust gases to the transmission oil. Inlet and outlet ducts route exhaust gas between the heat exchanger and an exhaust pipe located downstream of the catalyst. The exhaust pipe accommodates a control valve that diverts exhaust gas flow to the heat exchanger during the warm-up phase, or to the tailpipe during steady state operation. A control function is provided to monitor transmission oil temperature and engine operating conditions and to control actuation of the valve. The main input parameter to the control function is the transmission oil temperature.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.