Motor Vehicle And Control Method Of The Same

• US 20080086255A1
• Filed: 08/29/2005
• Published: 04/10/2008
• Est. Priority Date: 09/01/2004
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Watanabe, Hideto, Oshima, Keijiro
• Application Number:
  US11/632,904
• Publication Number:
  US 20080086255A1
• Time in Patent Office: Days
• US Class Current: 701/101
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 2540/16 Ratio selector position
• CPC Class Codes: B60W 2552/15 Road slope, i.e. the inclination of a road segment in the longitudinal direction
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: B60W 30/18118 Hill holding
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: F16H 2061/205 Hill hold control, e.g. with torque converter or a friction device slightly engaged to keep vehicle stationary
• CPC Class Codes: F16H 63/483 Circuits for controlling engagement of parking locks or brakes
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A gear change from a parking position is predicted, in response to an ON operation of a gearshift cancellation button concurrently with the driver'"'"'s depression of a brake pedal. The control procedure of the invention sets an auxiliary driving force F* in a direction of canceling a force, which acts in a longitudinal direction of a motor vehicle based on a road surface gradient θ. When the auxiliary driving force F* is less than a preset driving force F1, a motor MG2 is controlled to output the auxiliary driving force F*. When the auxiliary driving force F* is not less than the preset driving force F1, on the other hand, motors MG2 and MG3 are controlled to cooperatively output the auxiliary driving force F*. This arrangement effectively reduces the force in the longitudinal direction of the motor vehicle applied to a parking mechanism and ensures a smooth gearshift operation of a gearshift lever from the P position to another gear position.

Claims

1. A motor vehicle, comprising:

a first motor that outputs driving force to drive said motor vehicle;

a driving force source that outputs driving force to drive said motor vehicle;

a locking structure that locks an axle of said motor vehicle in a non-rotatable manner, in response to a driver'"'"'s gearshift operation of a gearshift lever to a parking position;

an out-of-parking-position operation prediction module that predicts a gear change operation from the parking position or an out-of-parking-position operation, for example, a gearshift operation of the gearshift lever from the parking position to another gear position;

an auxiliary driving force setting module that sets an auxiliary driving force in a direction of canceling a vehicle weight force component or a force component of a vehicle weight in a longitudinal direction of said motor vehicle based on a road surface gradient; and

a control module that, in response to prediction of the out-of-parking-position operation by said out-of-parking-position operation prediction module, controls the first motor to output the set auxiliary driving force when the auxiliary driving force is less than a preset driving force, while controlling the first motor and the driving force source to cooperatively output the set auxiliary driving force when the auxiliary driving force is not less than the preset driving force.

2. A motor vehicle in accordance with claim 1, wherein the out-of-parking-position operation is a combination of multiple operations, and

said out-of-parking-position operation prediction module predicts the out-of-parking-position operation in response to execution of at least part of the multiple operations of the out-of-parking-position operation.

3. A motor vehicle in accordance with claim 1, wherein said auxiliary driving force setting module measures the road surface gradient and sets the auxiliary driving force to increase with an increase in measured road surface gradient.

4. A motor vehicle in accordance with claim 1, wherein said auxiliary driving force setting module measures the vehicle weight force component and sets the auxiliary driving force to increase with an increase in measured vehicle weight force component.

5. A motor vehicle in accordance with claim 1, wherein the driving force source comprises a second motor that outputs driving force to a different axle from the axle receiving the driving force output from the first motor, and

said control module controls the first motor and the driving force source to ensure output of at least part of the auxiliary driving force from the second motor, when the auxiliary driving force is not less than the preset driving force.

6. A motor vehicle in accordance with claim 1, wherein the driving force source comprises an internal combustion engine that outputs driving force to drive said motor vehicle, and

said control module controls the first motor and the driving force source to make the output driving force of the internal combustion engine supplement at least part of the auxiliary driving force, when the auxiliary driving force is not less than the preset driving force.

7. A motor vehicle in accordance with claim 6, wherein the driving force source comprises:

a three shaft-type power input output module that is linked to three shafts, that is, an output shaft of the internal combustion engine, a drive shaft linked to the axle, and a third shaft, and automatically determines power input from and output to a residual one shaft based on powers input from and output to any two shafts among the three shafts; and

a generator that inputs and outputs power from and to the third shaft.

8. A motor vehicle in accordance with claim 6, wherein the driving force source comprises a pair-rotor motor that has a first rotor connected to an output shaft of the internal combustion engine and a second rotor connected to a drive shaft linked to the axle and is driven through relative rotation of the first rotor to the second rotor.

9. A motor vehicle in accordance with claim 1, wherein said control module controls the locking structure to cancel locking of the axle, in response to the driver'"'"'s out-of-parking-position operation.

10. A motor vehicle in accordance with claim 1, wherein the locking structure locks the axle in the non-rotatable state by gear engagement.

11. A control method of a motor vehicle including:

a first motor that outputs driving force to drive said motor vehicle;

a driving force source that outputs driving force to drive said motor vehicle; and

a locking structure that locks an axle of said motor vehicle in a non-rotatable manner, in response to a driver'"'"'s gearshift operation of a gearshift lever to a parking position, said control method comprising the steps of;

a) predicting a gear change operation from the parking position or an out-of-parking-position operation, for example, a gearshift operation of the gearshift lever from the parking position to another gear position;

b) setting an auxiliary driving force in a direction of canceling a vehicle weight force component or a force component of a vehicle weight in a longitudinal direction of said motor vehicle based on a road surface gradient; and

c) in response to prediction of the out-of-parking-position operation by said step a), controlling the first motor to output the set auxiliary driving force when the auxiliary driving force is less than a preset driving force, while controlling the first motor and the driving force source to cooperatively output the set auxiliary driving force when the auxiliary driving force is not less than the preset driving force.

12. A control method of a motor vehicle in accordance with claim 11, wherein the out-of-parking-position operation is a combination of multiple operations, and

said step a) predicts the out-of-parking-position operation in response to execution of at least part of the multiple operations of the out-of-parking-position operation.

13. A control method of a motor vehicle in accordance with claim 11, wherein said step b) measures the road surface gradient and sets the auxiliary driving force to increase with an increase in measured road surface gradient.

14. A control method of a motor vehicle in accordance with claim 11, wherein said step b) measures the vehicle weight force component and sets the auxiliary driving force to increase with an increase in measured vehicle weight force component.

15. A control method of a motor vehicle in accordance with claim 11, wherein the driving force source comprises a second motor that outputs driving force to a different axle from the axle receiving the driving force output from the first motor, and

said step c) controls the first motor and the driving force source to ensure output of at least part of the auxiliary driving force from the second motor, when the auxiliary driving force is not less than the preset driving force.

16. A control method of a motor vehicle in accordance with claim 11, wherein the driving force source comprises an internal combustion engine that outputs driving force to drive said motor vehicle, and

said step c) controls the first motor and the driving force source to make the output driving force of the internal combustion engine supplement at least part of the auxiliary driving force, when the auxiliary driving force is not less than the preset driving force.

17. A control method of a motor vehicle in accordance with claim 11, wherein said step c) controls the locking structure to cancel locking of the axle, in response to the driver'"'"'s out-of-parking-position operation.