Internal-combustion engines – Starting device – For airplane
Patent
1982-02-08
1984-02-07
Argenbright, Tony M.
Internal-combustion engines
Starting device
For airplane
123 64, 123292, F02B 1902, F02B 7502
Patent
active
044296690
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.
REFERENCES:
patent: 3785355 (1974-01-01), Toepel
patent: 3929107 (1975-12-01), Renger
patent: 3996912 (1976-12-01), Dreisin et al.
patent: 4191152 (1980-03-01), Deutschmann
patent: 4223645 (1980-09-01), Nohira et al.
patent: 4289097 (1981-09-01), Ward
Argenbright Tony M.
General Motors Corporation
Outland Robert J.
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