Vehicle height control apparatus
US4733875A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 21, 1986 |
| Grant date | Mar 29, 1988 |
| Priority date | — |
| Expiry date | Apr 21, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60G17/018
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A vehicle height control device that includes a pressure sensor 28 for detecting the pressure of compressed air supplied to pneumatic shock absorbers 10 for pneumatically bearing the load of a vehicle loads applied through the wheels. A control circuit 30 is included for controlling vehicle height based on the pressure detected by the pressure sensor 28. A waveform shaping circuit is connected between the control circuit 30 and the pressure sensor 28 and shapes the waveform to moderate the pressure change while the pressure is rising to a greater degree than while the pressure is dropping. The waveform shaping circuit includes a passive low-pass filter circuit 38, an active low-pass filter circuit 52 and a pair of diodes 70 and 72. The diodes 70 and 72 connected to the active filter circuit 52, allowing rapid capacitor discharge during decreases in signal amplitude while maintaining a slow discharge rate during decreases in signal amplitude.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.