Apparatus for controlling multi-cylinder internal combustion engine with partial cylinder switching-off mechanism
US6138636A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 25, 1999 |
| Grant date | Oct 31, 2000 |
| Priority date | — |
| Expiry date | May 25, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an apparatus for controlling a multi-cylinder internal combustion engine with partial cylinder switch-off mechanism which is switchable between an all-cylinder operation mode in which all cylinders are operated and a partial-cylinder operation mode in which operation of partial cylinders is suspended, the operation of intake valves and exhaust valves is suspended or resumed in a predetermined order with respect to all of the suspended cylinders irrespective of a rotational frequency of the engine. There are provided a solenoid valve on an intake side and a solenoid valve on an exhaust side for switching input hydraulic pressures for hydraulically operated switching devices respectively on the intake side and on the exhaust side between the driving state and the drive-free state. At the time of switching the operation, one of the solenoid valves on the intake side and the exhaust side is driven in advance. The subsequent number of rotations of a crankshaft is counted. When the number of this counting has reached a predetermined value, the solenoid valve on the other side is driven.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.