US 5,208,519 A · Electronic speed governor

Abstract

An electronic governor is disclosed for power producing and power absorbing devices having a minimum number of component parts. Power for all of the electronic governor components is supplied by a small coil, thereby avoiding the need for an additional coil frame or other power source. In a preferred embodiment, power supply circuitry converts the alternating signal from the coil to a direct current signal to power the governor. A signal conditioner also provides a low state signal to a 555 timer to start the timing cycle. The length of the timing cycle, and thus the high state control signal output of the timer, is a function of the desired device speed. When the timer output is at a high state while at the same time the alternating signal from the coil is at its first polarity, one or more switches conduct to adjust an electromagnetic actuator. In one embodiment, the switches control a motor connected to an engine throttle and operated in a stepper mode. In another embodiment, the switch shunts a portion of the alternating signal from a capacitor connected across an electromagnetic throttle positioner, thereby partially closing the engine throttle.

Claims33

Dependent claims

An electronic speed governor that maintains the actual speed of a device near a predetermined speed, comprising:

input means for receiving an alternating signal indicative of actual speed, said alternating signal having a first polarity and a second polarity;
signal conditioning means for receiving said alternating signal and for outputting a direct current signal;
timer means for receiving said direct current signal and for outputting a control signal having a first state and a second state;
first switch means, connected in circuit with both said input means and with said timer means, for gating on when both said control signal is in said first state while at the same time said alternating signal is at said first polarity;
and
adjustment means for adjusting the actual speed when said first switch means is gated on.

3 more elements

Dependencies are inferred from the claim text.

Electronic speed governor

Life of this patent

Electronic speed governor

Life of this patent

Abstract

Claims33