METHOD TO DEFINE COMPONENTS OF TOTAL ICE MECHANICAL LOSSES Russian patent published in 2010 - IPC G01M15/04 

FIELD: machine building.

SUBSTANCE: invention relates to designing, testing and diagnosing ICE systems and mechanisms, particularly to methods aiming at determining the total moment of mechanical losses originating in cranking with no fuel feed into cylinders, and can be sued in development of devices designed for thermal preparation of ICE at low ambient temperatures as well as for checking up its state in assembling, running-up and operation. Proposed method consists in cranking engine crankshaft by starter with constant rpm and with no fuel fed. Total moment of mechanical losses M_Tc of cold engine is measured with auxiliary mechanisms running and idle M_Tc without aux. The moment of engine mechanical losses with warmed-up group M_{Th WUG} is measured with cold crank gear. Total moment of mechanical losses of hot engine M_Th is measured. Cold engine is decompressed. Moments of mechanical losses are measured at cranking with valve gear running M_{T∂c WGR} and idle M_T∂c with no rotation. Components of the total moment of mechanical losses of cold engine M_Tc: M_{Tc VG} - of friction forces in valve gear; M_{Tc P} for overcoming pump loses; M_{Tc AUX} for auxiliary mechanism drive; M_{Tc CG} for friction forces in crank gear; M_{Tc CPG} for friction forces in cylinder-piston group, are defined from the following equation: M_{Tc VG} = M_{T∂c VG} - M_T∂c withut revolution; M_{Tc P} = M_Tc - M_{T∂c CPG}; M_Tc = M_Tc- M_{Tc without AUX}; M_{Tc CG} = M_{Tc CPG} - M_Tc - M_{Tc VG} - M_Tcp - M_{Tc AUX}; M_{Tc CPG} = M_Tc - M_Th - M_{Tc CG} - M_{Tc VG} - M_{Tc P} - M_{Tc AUX}.

EFFECT: higher accuracy of determination of ICE mechanical loss total moment.

2 cl