Patent ID: 7909728
Filing Date: 2011-03-22
Classification: B60K,B60L,B60W,F16H,Y02T,Y10T

Abstract:
1. A control device for a vehicular drive apparatus, the vehicular drive apparatus including (i) a differential portion including a differential mechanism enabled to distribute an output of an engine to a first electric motor and a power transmitting member, and a second electric motor disposed in a power transmitting path between the power transmitting member and drive wheels, and (ii) a shifting portion forming a part of the power transmitting path, the control device comprising: an electric motor control unit which controls a rotational speed of the transmitting member or a rotational speed of the engine using at least one of the first electric motor or the second electric motor during a shifting of the shifting portion, based on whether the shifting of the shifting portion is for continuously varying a total speed ratio achieved with the differential portion and the shifting portion, or the shifting is for non-continuously varying the total speed ratio; a differential state determining unit which determines whether the differential mechanism is in a continuously varying shifting state; and a speed ratio change determining unit which determines whether the total speed ratio is non-continuously varying to permit shifting that allows a varying range of a targeted total speed ratio to exceed a predetermined value, wherein when the differential state determining unit determines that the differential mechanism is in a continuously varying shifting state and the speed ratio change determining unit determines that the total speed ratio is non-continuously varying, the shifting portion shifts to a predetermined gear position and the electric motor control unit changes a rotational speed of the first electric motor to control the rotational speed of the engine such that the differential portion shifts in non-synchronism with shifting of the shifting portion to allow the total speed ratio to approach the target total speed ratio, and wherein when the differential state determining unit determines that the differential mechanism is in a continuously varying shifting state and the speed ratio change determining unit determines that the total speed ratio is not non-continuously varying, the shifting portion shifts to the predetermined gear position and the electric motor control unit changes the rotational speed of at least one of the first electric motor or the second electric motor such that the rotational speed of the transmitting member achieves a predetermined varying state and the rotational speed of the engine remains nearly constant.