Electronic speed governor

Details Electronic speed governor Electronic speed governor

1994-04-15

1996-06-11

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Having condition responsive means with engine being part of...

180179, F02D 3100

Patent

active

055245889

ABSTRACT:
The low cost speed governor for internal combustion engines may be completely powered by the ignition coil. The governor receives a periodic signal from the primary ignition winding that is indicative of the actual speed of the engine. A pulsed speed signal is generated that is functionally related to the periodic signal. The pulsed speed signal has a pulse width that is functionally related to the actual engine speed. A pulsed reference signal is generated by a timer circuit, and has a pulse width that is functionally related to a predetermined reference speed. The pulsed speed signal is then compared with the pulse reference signal by a comparator circuit, and a pulsed error signal is generated that has a pulse width which is functionally related to the difference between the speed signal pulse width and the reference signal pulse width. The speed of the device is then changed by a transistor bridge network as a function of the error signal. The speed is changed using a reversible DC motor connected to the engine throttle through a gear reduction system. The electronic governor may also include a delay circuit which delays the operation of the governor when an underspeed condition occurs during engine warm-up. Another optional circuit in the governor limits the changing of the engine speed when only a slight underspeed condition exists, to prevent unnecessary cycling of the engine speed.

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