Method and apparatus for operation of a speed-governed lean burn

Details Method and apparatus for operation of a speed-governed lean burn Method and apparatus for operation of a speed-governed lean burn

1996-12-11

1998-04-14

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

F02D 4114

Patent

active

057380708

ABSTRACT:
A speed-governed lean burn engine and its fuel and air delivery apparatus are provided with a control system that monitors engine conditions, including actual speed relative to a desired speed setting, to determine which of two air to fuel ratios the engine operates with under the existing conditions: either a stoichiometric ratio or a lean-burn ratio. A stoichiometric ratio is to provide short periods of smooth and rapid response to an increased load during which NOx emissions are reduced by a three-way catalyst in the exhaust from the engine. The lean-burn ratio during other periods of operation is sufficiently lean to exhibit low NOx emissions and allows operation with low fuel consumption. The invention can be applied to improve performance of gas fueled truck engines, for example.

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Caterpillar product brochure LEHT5626 (Oct. 1995), for Gas Truck Engine G3306.

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