Process for decompression control in internal combustion engine and

Abstract

A process and apparatus for controlling the decompression of an internal combustion engine for driving compressors, electric generators, and the like, the process including the steps of starting the engine with the decompression control engaged and the engine decompressed, partially activating the control when the engine reaches a first predetermined speed so that, as the speed is increased, the engine operates compressed, when the engine reaches normal operating speed, fully activating the control and, when the engine speed is decreased to a second predetermined speed below said normal operating speed but above said first predetermined speed, the control is reactivated for decompression operation of the engine until the engine stops. The apparatus comprises a decompression weight and subsidiary decompression weight, pivotally mounted for movement by centrifugal force relative to the engine cam shaft and interconnecting means for interconnecting the weights when the engine is started and until the engine reaches a first predetermined speed, releasing the weights, one from the other, above such predetermined speed, and re-engaging the weights after the engine is stopped.