Electronic governor for fuel-injection type internal combustion engines

Claim 2

An electronic governor for a fuel-injection type internal combustion engine, comprising variable frequency oscillator means for producing a first, reference signal, means for generating a second, d.c. voltage signal related to the rotational speed of the engine, comparison circuit means for comparing the signal produced by said oscillator means and said d.c. voltage signal produced by said generating means, and for producing a control signal in accordance therewith, fuel regulating rod control means for controlling the displacement of the fuel regulating rod, means, including a power amplifier circuit, for connecting the control signal output of said comparison circuit means to said fuel regulating rod control means, and feedback circuit means responsive to the poSition of the fuel regulating rod for controlling the frequency of said variable frequency oscillator circuit means in accordance with the displacement of the fuel regulating rod, said power amplifier circuit including means for setting the speed regulation provided by the governor and said governor further comprising means responsive to a signal related to said d.c. voltage signal for decreasing the current output of said power amplifier circuit in response to an increase in the rotational speed of the engine so as to automatically decrease the fuel supply to the engine progressively from low to high over the engine speed range.

Claim 3

An electronic governor as claimed in claim 1 further comprising override means for overriding said feedback circuit means in accordance with the position of the accelerator operating lever.

Claim 4

An electronic governor as claimed in claim 1 wherein said fuel regulating rod control means includes an electromagnetic control coil, said governor further comprising anti-overrun circuit means for providing a stable engine output characteristic over the full engine speed range and comprising relay means responsive to said d.c. voltage signal for terminating the current flow to said electromagnetic control coil when the engine speed reaches a predetermined value so that the fuel regulating rod moves in a direction to decrease the fuel supply to the engine.

Claim 5

An electronic governor for a fuel-injection type internal combustion engine, comprising variable frequency oscillator means for producing a first, reference signal, means for sensing engine rotational speed and for generating a second, d.c. voltage signal the magnitude of which is related to the rotational speed of the engine, comparison circuit means for comparing said first signal produced by said oscillator means and said d.c. voltage signal produced by said generating means and for producing a control signal in accordance therewith, electromagnetic fuel regulating rod control means for controlling the displacement of the fuel regulating rod, means for connecting the control signal output of said comparison circuit means to said electromagnetic fuel regulating rod control means, circuit means responsive to the position of the fuel regulating rod for controlling the frequency of said variable frequency oscillator circuit means in accordance with the displacement of said fuel regulating rod, and anti-overrun circuit means for providing a stable engine output characteristic over the full engine speed range and comprising relay means responsive to said d.c. voltage signal for terminating the current flow to said electromagnetic control means when the engine speed reaches a predetermined value so that the fuel regulating rod moves in a direction to decrease the fuel supply to the engine, said connecting means including power amplifier circuit means including means for setting the speed regulation provided by the governor, and said governor further comprising means responsive to a signal related to said d.c. voltage signal for decreasing the current output of said power amplifier circuit means in response to an increase in the rotational speed of the engine so as to automatically decrease the fuel supply to the engine progressively from low to high over the engine speed range.

Claim 6

An electronic governor for a fuel-injection type internal combustion engine, comprising variable frequency oscillator means for producing a first, reference signal, means for sensing engine rotational speed and for generating a second, d.c. voltage signal the magnitude of which is related to the rotational speed of the engine, comparison circuit means for comparing said first signal produced by said oscillator means and said d.c. voltage signal produced by said generating means and for producing a control signal in accordance therewith, electromagnetic fuel regulating rod control means for controlling the displacement of the fuel regulating rod, means for connecting the control signal output of said comparison circuit means to said electromagnetic fuel regulating rod control means, circuit means responsive to the position of the fuel regulating rod for controlling the frequency of said variable frequency oscillator circuit means in accordance with the displacement of said fuel regulating rod, and anti-overrun circuit means for providing a stable engine output characteristic over the full engine speed range and comprising relay means responsive to said d.c. voltage signal for terminating the current flow to said electromagnetic control means when the engine speed reaches a predetermined value so that the fuel regulating rod moves in a direction to decrease the fuel supply to the engine, said connecting means including power amplifier circuit means including means for setting the speed regulation provided by the governor, and said governor further comprising means responsive to a signal related to said d.c. voltage signal for decreasing the current output of said power amplifier circuit means in response to an increase in the rotational speed of the engine so as to automatically decrease the fuel supply to the engine progressively from low to high over the engine speed range.