Driving force controller in vehicle for forcibly upshifting in response to a driving force traction controller and a vehicle stopped detection means
US5813936A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1997 |
| Grant date | Sep 29, 1998 |
| Priority date | — |
| Expiry date | Mar 14, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2059/506
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A driving-force controller in a vehicle in which, when an accelerator pedal is depressed to initially move the vehicle at a time t.sub.1, if a state in which a vehicle speed is zero due to slippage of driven wheels continues for a predetermined time, it is judged that the vehicle is on a road surface having an extremely low road surface friction coefficient. If a driven wheel speed and the vehicle speed become zero at a time t.sub.4 because a driver abandons initial acceleration and releases an accelerator pedal, a gear shift stage of an automatic transmission is forcibly shifted to a second gear shift stage, and a target slip rate set in a traction control device is switched to a decreased value. As a result, when the driver depresses the accelerator pedal to restart the vehicle at a time t.sub.5, excessive slippage is suppressed by a decrease in driven wheel torque so that the vehicle begins moving smoothly. If a driven wheel slip rate exceeds the decreased target slip rate at a time t.sub.6, engine power output is immediately decreased by the traction control to further effectively suppress excessive slippage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.