Diesel engine speed limiter - has fuel pressure regulating valve on injection system held open when speed exceeds set level

Abstract

Abstract Excess fuel from the injectors is returned through a common pipe (15) in which there is a spring loaded pressure regulating valve (17). The valve stem is extended to carry an armature (22) which can be pulled back by a solenoid (23) is energised from the engine battery (25) through a tachometer (26). Alternatively the circuit can pass through a switch (28) mounted on the gearbox (29). With either arrangement the pressure regulating valve is held open when the engine exceeds a preset speed. This reduces the fuel pressure and therefore the quantity injected.

Inventors

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