Suspension control apparatus
US6016454A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1997 |
| Grant date | Jan 18, 2000 |
| Priority date | — |
| Expiry date | Aug 13, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60G2500/10
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In the suspension control apparatus of the present invention, a CPU determines a desired damping force, based on an acceleration of a car body in a vertical direction, which is detected by an acceleration sensor, and also determines a PWM duty ratio corresponding to an intensity of a target current (an average intensity of the applied current) required for generating the desired damping force. Further, the CPU detects a voltage provided by a battery and adjusts the PWM duty ratio, based on the detected voltage value, so as to maintain a dither amplitude at a predetermined level. A PWM signal having the adjusted duty ratio is outputted to a transistor, to thereby apply a current which is obtained by superimposing a dither on the target current. By this arrangement, the dither amplitude can be maintained at a predetermined level, even when the voltage value changes, so that an undesirable increase in hysteresis with respect to a damping force can be avoided and pronounced noise and vibration of a proportional solenoid valve can be suppressed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.