Accumulator fuel injection system

Fluid sprinkling – spraying – and diffusing – Unitary injection nozzle and valve with continuously...

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Details

239124, 2395338, F02M 4702, F02M 5702

Patent

active

049628879

ABSTRACT:
In the accumulator fuel injection system according to the present invention, a leak passage is formed in an accumulator in which a fuel supply pressure from a fuel injection pump is temporarily stored, and a control valve adapted to be opened and closed by the energization of a solenoid so as to pen and close this leak passage is provided. In order to secure a predetermined fuel injection quantity, the pressure in the accumulator is reduced suddenly by an operation of the control valve to a level not higher than a needle valve closing pressure to shorten the fuel injection time and increase the pressure in the accumulator to a high level, whereby a fuel injection rate is increased. A pressure chamber having a relief valve therein is further provided in the portion of the leak passage which is on the downstream side of the control valve. Therefore, even when an ignition delay is shortened in a high-temperature condition of a heat insulating engine, the quantity of the fuel to be injected into a combustion chamber is maintained constantly at a predetermined level, and the performance of the engine is improved. Moreover, the pressure chamber prevents a leak pressure from decreasing to a level not higher than a predetermined level, so that a wasteful operation can be minimized during the increasing of the pressure in the accumulator while a subsequent fuel injecting step is carried out.

REFERENCES:
patent: 4326672 (1982-04-01), Goloff

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