Engine speed limiter which is sensitive to acceleration

Details Engine speed limiter which is sensitive to acceleration Engine speed limiter which is sensitive to acceleration

1997-06-26

1998-07-07

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Engine speed reduction by partial or complete omission of...

123198DC, F02P 1102

Patent

active

057752907

ABSTRACT:
A speed limiting circuit measures the speed of the engine through the use of a device that functions generally as a tachometer. A speed signal is provided and is a function of the frequency of a plurality of pulses provided by a pulse generator. The frequency of the plurality of signal pulses, in a preferred embodiment, is representative of the frequency of a plurality of voltage pulses provided by an ignition coil. Since the voltage pulses from the ignition coil are directly related to the speed of the engine, the speed signal from an integrator can be used as an accurate representation of the engine speed. This speed signal can then be differentiated to determine the acceleration of the engine. The speed signal and acceleration signal are combined by an adder and the combined signal that results is compared to a threshold magnitude. During periods of rapid acceleration of the engine, the ignition system is inhibited at an earlier time than would occur if the speed signal itself was being compared directly to the threshold magnitude. When the propeller of a boat leaves the water, the possibly damaging effects of the resulting acceleration are avoided through the use of the combined signal that adds the acceleration and speed signals together.

REFERENCES:
patent: 4262641 (1981-04-01), Mosely et al.
patent: 4979477 (1990-12-01), Nickel et al.
patent: 5138996 (1992-08-01), Fiorenza, II

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