Barber Colman Company

George H Anderson

William J Barrett

A monitor and governor circuit provides speed control for an engine. The governor portion of the circuit, principally a PID controller, includes a fail safe circuit to shut the engine down in the absence of signals related to engine RPM. In addition, the governor includes a high gain feature operable during start up to keep the integrator from saturating. The speed monitor portion of the circuit prevents engine damage in the event that the speed governor should fail as, for example, due to a shorted output transistor or an open speed setting potentiometer. The end user is not required to set the speed monitor since it can be preset to a selected percent of the governor set speed.

Engine control circuit including speed monitor and governor

An automatic control system wherein repetitive pulses, the frequency of which is responsive to a remote condition, such as prime mover RPM, are converted to a DC voltage level. The voltage level is compared to a reference by a difference amplifier to produce an error signal. Further signals are produced from the error signal which are ultimately used to control the remote condition. The gain of the amplifier is externally adjustable depending upon conditions relating to the prime mover load conditions.

Automatic control system with gain switching

An automatic control system wherein repetitive pulses, the frequency of which is responsive to a remote condition, such as prime mover RPM, are converted to a DC voltage level. The voltage level is compared to a reference by a difference amplifier to produce an error signal. Further signals are produced from the error signal, including an integral thereof, which signals are ultimately used to control the remote condition. The integrator is provided with an offset circuit to prevent saturation thereof during override of the normal control signal by an external limit signal as, for example, excessive engine temperature or smoke output.

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Rockford, IL, United States of America

George H Anderson