Internal-combustion engines – Poppet valve operating mechanism – Hydraulic system
Patent
1974-12-23
1976-02-17
Myhre, Charles J.
Internal-combustion engines
Poppet valve operating mechanism
Hydraulic system
123 9015, 123 9016, F01L 902
Patent
active
039384837
ABSTRACT:
The gasoline engine torque regulator described herein provides means of reducing the quantities of harmful oxides of nitrogen emitted via the exhaust of a four stroke cycle gasoline engine and also of increasing the efficiency of the engine at part load. These beneficial objects are achieved by adjustably delaying the closing of the engine intake valve as a means of controlling the engine torque, the opening of the intake valve remaining fixed. This manner of intake valve opening and closing can be achieved by adding to the conventional intake valve operating mechanism a dashpot device with a restricted flow passage and a check valve which allows free opening of the valve by the cam mechanism but retards closing of the valve by the valve return spring. With intake valve closing delayed, a portion of the air-fuel mixture, drawn into the engine cylinder during the intake stroke, is pushed back into the intake manifold during the compression stroke. As a result less air-fuel mixture remains in the engine cylinder and the engine torque is reduced, the extent of such torque reduction increasing as the intake valve closing is longer delayed. The engine compression ratio is reduced at reduced torque and, in consequence, gas temperatures during compression, combustion and expansion are reduced, producing a beneficial decrease in the quantities of oxides of nitrogen formed and subsequently emitted. Part load efficiency of the engine is increased because pumping work is essentially eliminated.
REFERENCES:
patent: 885459 (1908-04-01), Engler
patent: 1965517 (1934-07-01), Vitalini
patent: 2065081 (1936-12-01), Lee
patent: 3257999 (1966-06-01), Fiedler
patent: 3518976 (1970-07-01), Thuesen
patent: 3738337 (1973-06-01), Massie
patent: 3817228 (1974-06-01), Bywater
Myhre Charles J.
O'Connor Daniel J.
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