RPM activated, powered limiter for pressure time vehicle engine fuel systems

Claim 1

An RPM limiter for vehicles having an engine of the type with a pressured power producing fuel feed system and bypass fuel means leading to a lower pressure source than the fuel feed system, said limiter comprising: electrically operated counting means arranged to count RPM's, valve means arranged to be connected for communication between the power producing pressure fuel feed system and the lower pressure source, said valve means having a first position closing off pressured fuel flow to the lower pressure bypass means for making full power fuel flow available in said fuel feed system and having a second position directing some of said pressured fuel to said lower pressure source for accomplishing reduced but power producing fuel flow in said fuel feed system, electrically operated control means activated by said counter means at a selected RPM reading of said counting means to move said valve means to its second position whereby to relieve part of the pressure from the pressured fuel feed system to said lower pressure source and thus partially reduce pressured flow to the engine and consequent partial reduction of power, said counting means being adjustable for providing selected RPM settings thereof, said control means comprising electrically operated delay means for delaying operation of said valve means and said reduced but power producing fuel flow in said fuel feed system for a selected interval after the RPM has reached the RPM setting of said counting means, first electrically operated driver signal means energized simultaneously with initial activation of said delay to warn the driver of the vehicle that said delay is in progress, and second electrically operated driver signal means energized by said counting means at a selected interval prior to the activation of said delay to warn the driver of the vehicle that said delay and said first mentioned signal means will be activated following said interval.