Apparatus for determining the fuel injection quantity in mixture

Details Apparatus for determining the fuel injection quantity in mixture Apparatus for determining the fuel injection quantity in mixture

1975-12-05

1977-09-20

Cohan, Alan

Internal-combustion engines

Noncompression

F02D 500

Patent

active

040489655

ABSTRACT:
A fuel metering system of an internal combustion engine is controlled by a digital computer circuit which delivers injection pulses to actuate the fuel injection valve of the engine. The duration of these pulses is directly related to the amount of injected fuel and depends on the inherent characteristics of the engine as well as on the engine r.p.m. and the degree of throttle opening. A set of data points each of which correlates a fuel datum with a pair of numbers related to engine speed and throttle valve opening, respectively, is stored in a digital memory and can be addressed by digital signals from transducers associated with engine speed and throttle valve position. An arithmetic unit then performs an interpolation process by weighted addition of nearest neighbor values of the datum stored in the memory. The final, interpolated datum is counted down at constant or variable frequency and represents an output signal related to the fuel injection period.

REFERENCES:
patent: 3862404 (1975-01-01), Fiedrich
patent: 3903857 (1975-09-01), Honig et al.
patent: 3935846 (1976-02-01), Zelenka

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