METHOD OF DETERMINING INDICATOR POWER OF INTERNAL COMBUSTION ENGINE Russian patent published in 2025 - IPC G01M15/04 G01L23/00 

FIELD: measuring.

SUBSTANCE: invention can be used for testing and technical diagnostics of machines. When conducting tests under operating conditions, a vehicle with a mechanical gearbox is prepared, force converters are installed in the engine supports, measuring device supplied from vehicle on-board network is connected to force transducers and standard sensor of crankshaft rotation frequency. Fuel injector programmed disconnection device is connected to engine electronic control unit. Engine is started and movement is started, the engine is heated together with the gearbox and drive axles to the rated temperature, shifted to the first gear, the maximum crankshaft speed is set by the maximum fuel supply to the engine, braking mechanisms are switched on and the engine is loaded with braking moment to a value corresponding to the rated speed of the crankshaft at maximum fuel supply, reactions of supports are discretely measured, the engine is unloaded and total reactive torque and effective power are determined during engine operation on all cylinders. Then the first cylinder is disconnected, the maximum crankshaft rotation frequency is set with the engine operation with the first cylinder disconnected, switching on braking mechanisms of the vehicle and loading the engine with braking torque to a value corresponding to the rated speed of the crankshaft during operation of the engine with maximum fuel supply, instantaneous values of crankshaft rotation frequency and reactions of supports are recorded with period of 360 degrees of crankshaft turn for at least five working cycles of the engine. After that instantaneous values of crankshaft rotation frequency and reactions of supports are measured in the same way during operation of the engine with the second, third and subsequent cylinders disconnected. Based on the obtained reaction values of the engine supports for each measurement moment, calculating the reactive torque on each support, the total reactive torque on the engine supports relative to the crankshaft rotation axis, effective engine power taking into account crankshaft speed values at corresponding measurement moment, and the average value of the effective power of the engine is determined separately for each measurement period during operation of the engine with the corresponding cylinder disconnected. Further, the average value of the indicated power of each cylinder is separately calculated as the difference between the average value of the effective power during operation of the engine on all cylinders and the average value of the effective power during operation of the engine with the corresponding cylinder disconnected, obtained average values of indicated power of each cylinder are summed up and average indicated power of the engine is obtained.

EFFECT: disclosed is a method for determining the indicated power of an internal combustion engine.

1 cl, 1 dwg