Suspension control system
US5701245A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 6, 1995 |
| Grant date | Dec 23, 1997 |
| Priority date | — |
| Expiry date | Oct 6, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60G2800/916
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A suspension control system of the present invention varies a damping force according to a velocity ratio of a mass-body velocity to a relative velocity, while ensuring both a comfortable drive and stable cruising. In the suspension control system, a CPU calculates a mass-body velocity Zd and a relative velocity Yd based on detection signals from sensors and determines a velocity ratio Zd/Yd (steps S110 and S120). A small skyhook damping coefficient is set for a small vehicle speed V to reduce a damping force according to the velocity ratio Zd/Yd (step S130). In the process of varying the damping force, a stepping motor used for the variation in damping force is driven at a low driving frequency for a small vehicle speed V (step S180). While the vehicle runs at a relatively low speed, the suspension control system of the invention restricts the degree of variation in damping force and lowers the rate of variation in damping force, thereby relieving shocks or uncomfortableness due to a delayed control of damping force, which is caused by a delayed detection of the relative velocity or a delayed response of devices and substantially maintaining a drive.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.