• US 3,729,989 A
  • Filed: 12/10/1970
  • Issued: 05/01/1973
  • Est. Priority Date: 12/10/1970
  • Status: Expired due to Term
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First Claim
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1. A readily portable apparatus for determining the useful horsepower of any prime mover at any point along its power train inclusive of the final drive element in the power train, said apparatus including, a. a pulsed and d.c. level velocity signal means having an input indicative of the velocity of rotation delivered by said prime mover and a first and a second output said first output is a d.c. level velocity of rotation signal directly proportional to said velocity of rotation of said prime mover, said second output is a pulsed output directly proportional to said velocity, b. a differentiator means electrically coupled to said pulsed and d.c. level velocity signal means to receive said first output and having a d.c. level acceleration signal output, c. a multiplier circuit means coupled respectively to both said second pulsed output and said d.c. level acceleration signal outputs to thereby provide an output signal which is a multiplication of said second and said acceleration signals, d. a time constant circuit coupled to said multiplier circuit means output, said time constant circuit having an output which is directly proportional to said useful horsepower and torque developed at any given instant during operation of said prime mover.

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