Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2011-07-19
2011-07-19
Kwon, John T (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C123S179400
Reexamination Certificate
active
07983833
ABSTRACT:
At a time of stopping operation of an engine, after elapse of a preset time period since start of self-sustaining operation of the engine at a stop rotation speed Nstop, the drive control sets a torque command Tm1* of a motor MG1to a rotation speed-decreasing, vibration-suppressing torque and starts decreasing a rotation speed Ne of the engine (steps S100, S140, S150, S170, and S180). The rotation speed-decreasing, vibration-suppressing torque is set to smoothly decrease the rotation speed of the engine and suppress the potential vibration caused by the decreased rotation of the engine. A correction torque Tmod is set based on a crank angle CA and an engine water temperature Tw at the rotation speed Ne of the engine decreasing to a preset reference speed Nref (step S200). The torque command Tm1* of the motor MG1is then set by adding the set correction torque Tmod to the rotation speed-decreasing, vibration-suppressing torque (step S210). This arrangement effectively prevents the crank angle CA from exceeding a top dead center immediately before the stop of the engine and thereby suppresses the potential vibration causes by the excess of the crank angle CA over the top dead center.
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Kwon John T
Sughrue & Mion, PLLC
Toyota Jidosha & Kabushiki Kaisha
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