Fuel injector for producing shaped injection pulses

Details Fuel injector for producing shaped injection pulses Fuel injector for producing shaped injection pulses

1978-09-13

1981-02-17

Lall, P. S.

Internal-combustion engines

Charge forming device

Fuel injection system

2395335, 123496, F02M 3902

Patent

active

042508576

ABSTRACT:
A fuel injector, especially adapted for diesel engines, produces a fuel injection pulse having a predetermined time-variable flow rate. Preferably the injection pulse is ramp-shaped which approximates a linear function of time. A pressure chamber receives fuel at a substantially constant flow rate and an injection valve connected therewith opens in response to the pressure in the pressure chamber for delivering a fuel injection pulse to the combustion chamber. Means for absorbing a fluid pulse, in the form of an absorption chamber and flow restrictor, is connected with the pressure chamber to accept a ramp-shaped absorption pulse which is inversely related to the injection pulse. The fuel flow rate into the pressure chamber varies directly with engine speed and the injection pulse has a slope and amplitude which vary directly with engine speed; the absorbing means is provided with time constant adjusting means responsive to speed of operation so that the slope and amplitude of the absorption pulse vary directly with engine speed.

REFERENCES:
patent: 1834061 (1931-12-01), Joachim
patent: 1974851 (1934-09-01), Hurst
patent: 2065272 (1936-12-01), Filehr
patent: 3747857 (1973-07-01), Fenne
patent: 3817456 (1974-06-01), Schlappkohl
patent: 4108383 (1978-08-01), Thoma
"Internal Pintle Nozzle", by H. E. Woodward, Oil Engine and Gas Turbine, Sep. 1964, 34.

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