Closed loop electric valve control for I. C. engine
US4957074A · kind A · utility
29Cited by
6References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1989 |
| Grant date | Sep 18, 1990 |
| Priority date | — |
| Expiry date | Nov 27, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L9/20
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The actual lift of a valve is monitored by a lift sensor that is coupled to an electronic valve controller by a lift signal processing circuit, and the electronic valve controller issues a control signal that is calculated to secure as faithful correspondence as possible of this lift signal to a command signal that the electronic valve controller receives from an electronic engine management controller. The processing circuit functions to disclose to the electronic valve controller the actual opening and closing instants of the valve in a manner that amounts to the sensor being precisely re-calibrated each time that it closes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.