Internal-combustion engines – Combustion chamber means having fuel injection only – Using multiple injectors or injections
Patent
1992-01-28
1993-09-07
Miller, Carl S.
Internal-combustion engines
Combustion chamber means having fuel injection only
Using multiple injectors or injections
123467, 239 96, F02B 300
Patent
active
052419355
ABSTRACT:
A series of method and apparatus advances in the accumulator-type fuel injector art, applicable to both intensified and unintensified accumulator injectors, which cooperate to provide major improvements in internal combustion engine fuel economy, reduction of noise, and reduction of undesirable exhaust emissions, including smoke, oxides of nitrogen and hydrocarbons. According to the invention, injector needle closure speed is increased for sharper fuel cutoff and better atomization proximate closure, and needle closure bounce is minimized to minimize fuel dribble proximate closure by reducing both mass and length of the needle, which can be accomplished by a longitudinally divided needle. Hydraulic damping also damps and cushions both needle closing and needle opening. The accumulator cavity and needle spring cavity are separated, enabling the accumulator cavity to be as small as desired for high accumulator closing pressure, while nevertheless enabling a strong, fast-acting spring to be used, both factors cumulatively contributing to good closure atomization. A two-stage needle lift is provided for first injecting a pilot fuel charge for preignition, and then injecting the main fuel charge, thereby eliminating the usual adverse premixed burning. The injection spray pattern is automatically varied for improved engine efficiency over the engine power spectrum by utilizing a pintle-type injector nozzle which is variably controlled according to the quantity of fuel delivered.
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Beck Niels J.
Johnston Bevan H.
Pena James A.
Roach Alan R.
Gabriel Albert L.
Miller Carl S.
Servojet Electronic Systems, Ltd.
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