Power control device
AssigneeForenade Fabriksverken
InventorPer Henrik Gosta Nystrom
Life of this patent
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Abstract
A hot gas engine uses inexpensive digital solenoid type control valves to govern engine output as a function of the amount of working gas. Electrical control signals are obtained by comparing a generator voltage derived from engine speed with a control voltage to develop a set of control signals including pulse width modulated pulses which are open over a duty cycle which produces the effect of analog solenoid valve control.
Claims7
A power control device for maintaining a predetermined speed of a hot gas engine irrespective of the engine load and of the type in which the power output from the engine is governed by adjusting the amount of working gas in said engine, characterized by a generator supplying a voltage as a function of the engine speed, a comparing device giving signals according to the difference between the actual engine speed and the desired speed, and control means giving signals to a solenoid valve arrangement for controlling the supply of working gas to the engine from a reservoir.
Dependencies are inferred from the claim text.