Engine brake horsepower test without external load

Details Engine brake horsepower test without external load Engine brake horsepower test without external load

G - Physics

01

L

73/168, 341/38.4

G01L 3/00 (2006.01) G01L 3/24 (2006.01) G01M 15/04 (2006.01)

Patent

CA 1041321

ENGINE BRAKE HORSEPOWER TEST WITHOUT EXTERNAL LOAD Abstract Apparatus for and method of determining the brake torque and horsepower of an internal combustion engine without connecting an external load. Means are provided to operate the engine at full throttle and with all but one out of n of successive ignitions inhibited, the value n being selected so that the engine operates with just enough power to equal the frictional load of the engine and main- tain an equilibrium speed at the upper end of the engine speed range. The engine is then operated momentarily with full ignition, and then with no ignition, during which a determination is made of the rate at which the engine decelerates through the equilibrium speed. The decelera- tion rate is multiplied by the known inertia of the engine to determine the friction torque of the engine at the equilibrium speed. The friction torque is multiplied by n - 1 to predict the brake torque of the engine at the equilibrium speed when operated normally with external load. Horsepower is determined by multiplying torque and speed. -1-

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