Driving force distribution control system for 4wd vehicle
US4986388A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 20, 1990 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Mar 20, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60K23/0808
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A control system for a 4WD vehicle includes a drive system for directly transmitting a torque to primary drive wheels, and transmitting a torque to secondary drive wheels through a torque distributing clutch, at least one sensor for determining a front and rear wheel speed difference, at least one sensor for determining a lateral acceleration, and a control unit for controlling the engagement force of the clutch. When the primary wheel speed is lower than the secondary wheel speed, the control unit holds the clutch engagement force equal to zero to improve the steering response until the absolute value of the wheel speed difference reaches a predetermined level, and increase the clutch engagement force in accordance with the absolute value of the wheel speed difference to improve the vehicle stability after the absolute value of the wheel speed difference exceeds the predetermined level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.