Internal-combustion engines – Precombustion and main combustion chambers in series – Having timed valves to precombustion and main combustion...
Patent
1982-02-08
1983-09-27
Nelli, Raymond A.
Internal-combustion engines
Precombustion and main combustion chambers in series
Having timed valves to precombustion and main combustion...
123 906, 123262, 123292, 123316, F02M 2506
Patent
active
044062605
ABSTRACT:
A prechamber type diesel engine is provided with a cutoff valve in the throat connecting the prechamber and main chamber of each cylinder and operable in cyclically timed fashion to close and open communication between these chambers. Methods of engine operation are disclosed which utilize the cutoff valve to (1) trap combustion products in the prechamber from the previous expansion stroke for use in mixing with the fresh charge in the following compression stroke to provide internal EGR preferably stratified in the prechamber and (2) permit low compression ratio starting by trapping compression pressure in the prechamber from a previous compression stroke for addition to combustion chamber pressure developed on the following compression stroke to provide a higher cylinder pressure for starting than that provided by the overall compression ratio. Advantages of improved engine efficiency and reduced emission levels are anticipated.
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General Motors Corporation
Nelli Raymond A.
Outland Robert J.
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