Adaptive control of camless valvetrain
US5419301A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1994 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Apr 14, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A variable camless engine valve control system and method of control wherein each of the reciprocating intake and/or exhaust valves (10) is hydraulically controlled and includes a piston (26) subjected to fluid pressure acting on surfaces at both ends of the piston (26), is connected to a source of high pressure fluid (40) in one volume (27) while the volume (25) at the other end is connected to a source of high pressure fluid (40) and a source of low pressure fluid (42), and disconnected from each through action of controlling means such as a computer (74) controlling solenoid valves (64, 68). Optimum intake air and residual gas quantities in each engine cylinder having the aforementioned variable valve control system is assured by controlling electric pulses of variable duration and timing. The pulse timing and duration are calculated based upon values in permanent memory of the computer (74) corresponding to information obtained from sensors and correction values from a correction memory corresponding to feedback from other sensors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.