DC level detector and zero velocity gate circuit for use in a vehicle skid control braking system
US4005909A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 3, 1972 |
| Grant date | Feb 1, 1977 |
| Priority date | — |
| Expiry date | Jul 3, 1992 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60T8/172
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Provided is a DC level detector and zero velocity gate circuit utilized in a vehicle skid control braking system. The circuit includes a first signal generator for generating a plurality of DC signals when the DC voltage level of a varying DC signal coupled to the circuit reaches a selected value, i.e., a DC voltage level representative of a substantially zero frequency condition. The varying DC signal is preferably proportional to the wheel speed of a moving vehicle. The circuit also includes a second signal generator for generating a gate signal indicating when the DC level reaches a selected level which indicates a zero velocity wheel speed. The first signal generator generates first and second signals which are differentiated by third and fourth signal generators indicating vehicle deceleration and vehicle acceleration in the vehicle skid control braking system. The circuit advantageously eliminates any undesirable ripple characteristics of the varying DC signal, preventing such ripple characteristics from being coupled to other voltage responsive circuits in, for example, a vehicle skid control braking system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.