Systems and methods for controlling engine speed in a hybrid vehicle
US10814861B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 2017 |
| Grant date | Oct 27, 2020 |
| Priority date | — |
| Expiry date | Mar 5, 2038 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S903/945
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Methods and systems are provided for controlling an engine speed in a hybrid vehicle system during steady-state conditions and in response to transient acceleration and/or deceleration requests. In one example, an engine speed is controlled to an optimal engine speed for fuel economy during steady-state conditions, and in response to an acceleration or deceleration request, a target engine speed is obtained from a rate-limited optimal engine speed to vehicle speed ratio, and the engine is controlled to the target engine speed provided the target speed is below a threshold difference from optimal engine speed. In this way, the vehicle system may simulate a fixed ratio transmission during accelerations and decelerations, while maintaining optimal engine speed for fuel economy at steady state.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.