EGR-gas flow rate estimation apparatus for internal...

Details EGR-gas flow rate estimation apparatus for internal... EGR-gas flow rate estimation apparatus for internal...

2005-04-12

2005-04-12

McCall, Eric S. (Department: 2855)

Measuring and testing

Simulating operating condition

Marine

Reexamination Certificate

active

06877369

ABSTRACT:
An EGR-gas flow rate estimation apparatus for an engine including an exhaust circulation pipe connected between an exhaust passage and an intake passage of the engine, and an EGR control valve interposed in the exhaust circulation pipe and having a throttle portion. The apparatus estimates a provisional EGR gas flow rate Gegr0by use of a general formula Gegr0=Aegr·(2·Pex·ρa)1/2·Φ (Φ=(((κ/(κ−1)·((Pb/Pex)2/κ−(Pb/Pex)(1+1/κ)))1/2) where Pup represents the exhaust pressure, Pb represents the intake pressure, Aegr represents the effective opening area of the throttle portion, ρa represents the density of EGR gas, and κ represents the specific heat ratio of EGR gas. Subsequently, the apparatus estimates the flow rate Gegr of EGR gas flowing into the intake passage, by multiplying the provisional EGR gas flow rate Gegr0by a correction value dPgain corresponding to differential pressure (Pex−Pb).

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