Circuit for measuring the horsepower per cylinder for an engine

A circuit for measuring the horsepower per cylinder of a reciprocating engine comprising:

• a pair of sensors positioned adjacent the flywheel of said engine, the first of said sensors responding once per revolution of said cylinder, and said second of said sensors responding once for each cylinder in one revolution;
• a pulse forming generator having the outputs of said sensors connected thereto and operative to provide 360 pulses for each degree per revolution, six pulses each representing one revolution per cylinder, one pulse per revolution representing dead center, and 60 pulses per revolution,
• a clock operative to provide time period pulses, and means for utilizing said time period with said 60 pulses per revolution for deriving a signal representative of the r.p.m. of said engine;
• a pressure transducer mechanically connected to each of said cylinders of said engine;
• a selector switch for selecting the cylinder pressure transducer to be measured,
• said transducers together with said six pulses operative to provide a voltage signal representing that particular cylinder;
• a volume signal and means for multiplying said pressure measurement against said volume signal for each degree of rotation of said cylinder and for summing the resultants thereof, and
• means for multiplying said summed resultants with said r.p.m. signal;
• display means for displaying the horse power for each cylinder.