Method and apparatus for electrically driving engine valves
US5598814A · kind A · utility
31Cited by
19References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 15, 1994 |
| Grant date | Feb 4, 1997 |
| Priority date | — |
| Expiry date | Dec 15, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01L9/22
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A motor control includes position transducers for generating crankshaft position and motor position pulse trains. The pulse trains are compared to detect any phase difference between engine and motor. Tables are generated to define the desired phase difference needed for particular valve characteristics. The phase difference represents the instantaneous deviation from the basic profile. One of the tables is selected according to the engine conditions and the motor is driven to achieve the desired phase differences.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.