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US 4,359,033 AGranted
Exhaust gas recycling in diesel engines
AssigneeNissan Diesel Motors Co., Ltd.
InventorsTadashi Furuya, Shuji Ota
Life of this patent
Estimating the term…
Abstract
The characteristics of a diesel engine exhaust gas recycling system are improved by reducing the percentage of the recycled exhaust gas in the low and high speed ranges of the engine. This is accomplished by the use of a conversion valve which decreases the input negative pressure to the vacuum amplifier which controls the recycling valve.
Claims10
An exhaust gas recycling system for diesel engines having air infeeds comprising
- an exhaust gas recycling valve for recycling part of the exhaust gases from the engine exhaust to the engine air infeed,
- a vacuum pump for actuating said recycling valve,
- a vacuum amplifier coupled to and controlling said recycling valve in response to an input negative pressure in said air infeed, and
- means operable between the air infeed and the vacuum amplifier for modifying the negative pressure which controls the vacuum amplifier.
1 more element
A method of recycling exhaust gas from a diesel engine exhaust to the engine air infeed comprising the steps of
- opening a recycling valve between said engine exhaust and said infeed in response to a negative pressure produced by a vacuum pump and controlled by a vacuum amplifier responsive to an input negative pressure in said infeed, and
- modifying the negative pressure taken from said infeed before applying it as an input to said vacuum amplifier.
Dependencies are inferred from the claim text.