Internal-combustion engines – Two-cycle – Rear compression
Patent
1989-09-14
1990-06-12
Miller, Carl Stuart
Internal-combustion engines
Two-cycle
Rear compression
123DIG5, 123 73C, F02M 5720, F02B 3304
Patent
active
049323709
ABSTRACT:
Fuel injection arrangements having pneumatically driven injection pumps utilize the fluctuating crankcase pressure whereby the injection time point is fixed by the system. The injection time point can be fixed so as to depart from the course of the pressure in the crankcase if the crankcase pressure is applied to the injection pump via an opening controlled by the piston and if the pressure drop is directed to the combustion chamber via a relief opening. However, it has been shown that this kind of control produces considerable problems with respect to fast-running two-stroke engines. Accordingly, it is a feature of the invention to provide a check valve in the connection between the relief opening and the injection pump and to position this check valve so that it opens in the flow direction toward the combustion chamber. In this way, high pressures which occur as a consequence of incomplete or irregular combustions in the combustion chamber cannot have a feedback effect on the injection pump and the quantity injected is not increased in a disadvantageous manner for the next cycle.
REFERENCES:
patent: 1219938 (1917-03-01), Hamilton
patent: 4471728 (1984-09-01), Borst
patent: 4473340 (1984-09-01), Walsworth
patent: 4539949 (1985-09-01), Walsworth
patent: 4551076 (1985-11-01), Dubois
patent: 4552101 (1985-11-01), Borst
patent: 4700668 (1987-10-01), Schierling
patent: 4846119 (1989-07-01), Geyer
Geyer Werner
Schierling Roland
Andreas Stihl
Miller Carl Stuart
Ottesen Walter
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