Exhaust gas re-circulation control unit for a diesel engine
US8479716B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 2009 |
| Grant date | Jul 9, 2013 |
| Priority date | — |
| Expiry date | Feb 16, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An EGR control unit for enhancing the performance as to the EGR rate and the engine acceleration, the unit being configured so as to control the EGR valve and the intake air valve with a simple control command signal that makes both the valves be operated in a coupled mode, whereby the response performance as to the engine speed during acceleration as well as the EGR gas flow rate is enhanced by means of compensation regarding the dead zones inherent in the intake air throttle valve and the EGR valve. An EGR control unit including; a dead zone evaluating means 64 that calculates the estimation excess air ratio λ in consideration of the residual air in the EGR gas; thereby, it is judged that at least one of the EGR valve 27 and the intake air throttle valve 29 is operated in the dead zone based on the rate of change of the calculated estimation excess air ratio λ when the rate of change of the ratio λ is smaller than a prescribed level; and a dead zone compensating means 66 that makes the revisions regarding the opening command signals as to the EGR valve and the intake air throttle valve so that the dead zones do not hinder the coupled operation between the valves when the dead zon…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.