Control device for vehicular drive apparatus
First Claim
1. A control device for a vehicular drive apparatus,the vehicular drive apparatus having a continuously variable shifting portion including a differential mechanism for distributing an output of an engine to a first electric motor and a transmitting member and a second electric motor configured to transmit power to a drive wheel and to receive power from the drive wheel to be operative as an electrically controlled continuously variable transmission, and a shifting portion disposed in a power transmitting path between the engine and the drive wheel, andthe control device comprising:
- a differential state switch device disposed in the differential mechanism and operative to selectively switch the continuously variable shifting portion in a continuously variable shifting state enabling the continuously variable shifting portion to perform an electrically controlled continuously variable shifting operation and a non-continuously variable shifting state disenabling the electrically controlled continuously variable shifting operation of the continuously variable shifting portion;
shifting control means operative to set a total speed ratio, defined with the continuously variable shifting portion and the shifting portion, to a lower vehicle speed side gear ratio than that defined for a given running condition of a vehicle when a need arises for a greater vehicle drive force or drive force source brake than those for the given running condition of the vehicle; and
switching control means operative to switch the continuously variable shifting portion from the continuously variable shifting state to the non-continuously variable shifting state if a required vehicle drive force or drive force source brake is unavailable when the shifting control means sets the total speed ratio to the lower vehicle speed side gear ratio than that defined for the given running condition of the vehicle.
1 Assignment
0 Petitions
Accused Products
Abstract
A control device is provided for a vehicular drive apparatus, having a differential mechanism and a transmission, for miniaturizing the differential mechanism and/or providing improved fuel economy while preventing a busy shift. With the provision of a switching clutch C0 or a switching brake B0, a transmitting mechanism 10 can be placed in a continuously variable shifting state and a step-variable shifting state whereby the vehicular drive apparatus has combined advantages including a fuel saving effect of the transmission, enabled to electrically change a gear ratio, and a high transmitting efficiency of a gear type transmitting device enabled to mechanically transmit drive power. With a total speed ratio γ T set to a lower vehicle speed gear ratio than that for a given running state, if a required drive force or a drive force source brake is unavailable or if load torque of an electric motor is deviated from an allowable range, switching control mean 50 switches a differential portion 11 to the step-variable shifting state for thereby obtaining larger drive force or drive force source brake than those for the given running state without causing load torque of the electric motor from deviating from the allowable range while preventing the busy shift.
25 Citations
18 Claims
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1. A control device for a vehicular drive apparatus,
the vehicular drive apparatus having a continuously variable shifting portion including a differential mechanism for distributing an output of an engine to a first electric motor and a transmitting member and a second electric motor configured to transmit power to a drive wheel and to receive power from the drive wheel to be operative as an electrically controlled continuously variable transmission, and a shifting portion disposed in a power transmitting path between the engine and the drive wheel, and the control device comprising: -
a differential state switch device disposed in the differential mechanism and operative to selectively switch the continuously variable shifting portion in a continuously variable shifting state enabling the continuously variable shifting portion to perform an electrically controlled continuously variable shifting operation and a non-continuously variable shifting state disenabling the electrically controlled continuously variable shifting operation of the continuously variable shifting portion; shifting control means operative to set a total speed ratio, defined with the continuously variable shifting portion and the shifting portion, to a lower vehicle speed side gear ratio than that defined for a given running condition of a vehicle when a need arises for a greater vehicle drive force or drive force source brake than those for the given running condition of the vehicle; and switching control means operative to switch the continuously variable shifting portion from the continuously variable shifting state to the non-continuously variable shifting state if a required vehicle drive force or drive force source brake is unavailable when the shifting control means sets the total speed ratio to the lower vehicle speed side gear ratio than that defined for the given running condition of the vehicle. - View Dependent Claims (2)
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3. A control device for a vehicular drive apparatus,
the vehicular drive apparatus having a continuously variable shifting portion including a differential mechanism for distributing an output of an engine to a first electric motor and a transmitting member and a second electric motor configured to transmit power to a drive wheel and to receive power from the drive wheel to be operative as an electrically controlled continuously variable transmission, and a shifting portion disposed in a power transmitting path between the engine and the drive wheel, the control device comprising: -
a differential state switch device disposed in the differential mechanism and operative to selectively switch the continuously variable shifting portion in a continuously variable shifting state enabling the continuously variable shifting portion to perform an electrically controlled continuously variable shifting operation and a non-continuously variable shifting state disenabling the electrically controlled continuously variable shifting operation of the continuously variable shifting portion; shifting control means operative to set a total speed ratio, defined with the continuously variable shifting portion and the shifting portion, to a lower vehicle speed side gear ratio than that defined for a given running condition of a vehicle when a need arises for a greater vehicle drive force or drive force source brake than those for the given running condition of the vehicle; and switching control means operative to switch the continuously variable shifting portion from the continuously variable shifting state to the non-continuously variable shifting state if load torques of the first electric motor and/or the second electric motor are deviated from allowable ranges when the shifting control means sets the total speed ratio to the lower vehicle speed side gear ratio than that defined for the given running condition of the vehicle. - View Dependent Claims (4)
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5. A control device for a vehicular drive apparatus,
the vehicular drive apparatus having a continuously variable shifting portion including a differential mechanism for distributing an output of an engine to a first electric motor and a transmitting member and a second electric motor configured to transmit power to a drive wheel and to receive power from the drive wheel to be operative as an electrically controlled continuously variable transmission, the control device comprising: -
a differential action limitation device disposed in the differential mechanism for limiting a differential action of the differential mechanism to thereby limit an operation of the continuously variable shifting portion as the electrically controlled continuously variable transmission; and engine brake control means operative to continuously vary the differential action of the differential mechanism by the differential action limitation device to obtain brake torque with engine brake during a speed reduction running. - View Dependent Claims (6, 7, 8, 9)
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10. A control device for a vehicular drive apparatus,
the vehicular drive apparatus having a differential portion including a differential mechanism for distributing an output of an engine to a first electric motor and a transmitting member and a second electric motor configured to transmit power to a drive wheel and to receive power from the drive wheel, the control device comprising: -
a differential action limitation device disposed in the differential mechanism for limiting a differential action of the differential mechanism to thereby limit a differential action of the differential portion; and engine brake control means operative to continuously vary the differential action of the differential portion by the differential action limitation device to obtain brake torque with engine brake during the speed reduction running. - View Dependent Claims (11, 12, 13, 14)
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15. A control device for a vehicular drive apparatus,
the vehicular drive apparatus having a differential portion including a differential mechanism for distributing an output of an engine to a first electric motor and a transmitting member and a second electric motor configured to transmit power to a drive wheel and to receive power from the drive wheel, the control device comprising: -
a differential state switch device disposed in the differential mechanism for selectively switching the differential portion to a differential state enabling a differential action and a non-differential state disenabling the differential action; and regeneration control means for altering a regeneration amount depending on whether or not the differential portion is placed in the differential state during the speed reduction running such that the regeneration amount is larger in the differential state of the differential portion than in the non-differential state of the differential portion. - View Dependent Claims (16, 17, 18)
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Specification