Vehicle and control method of vehicle

• US 20080076629A1
• Filed: 09/11/2007
• Published: 03/27/2008
• Est. Priority Date: 09/19/2006
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Sugai, Shinichi, Hayashi, Kazuhito
• Granted Patent: US 7,892,140 B2
• Time in Patent Office: Days
• US Class Current: 477/15
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/448 Electrical distribution type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 15/025 using field orientation; Vector control; Direct Torque Control [DTC]
• CPC Class Codes: B60L 2220/14 Synchronous machines
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• 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 10/11 Stepped gearings
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 30/14 Adaptive cruise control
• CPC Class Codes: F16H 2061/0488 during range shift from neutral (N) to drive (D)
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 : Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y10T 74/20085 : Restriction of shift, gear selection, or gear engagement

Abstract

In response to a change of a gearshift position from a parking position to a driving position, the control system of the invention connects a power shaft with a driveshaft linked to drive wheels (steps S310 and S380), while performing rotation restriction control to form a fixed magnetic field on a stator of a second motor and thereby prohibit rotation of a rotor in the second motor (step S300). This arrangement desirably restrains rotation of the power shaft and accordingly prevents the occurrence of a shock in the course of connection of the power shaft with an axle.

Claims

1. A vehicle, comprising:

a driving power source that outputs power to a power shaft;

a motor that inputs and outputs power into and from the power shaft;

a transmission that enables transmission of power with a change of a speed between the power shaft and an axle and disconnection of the power shaft from the axle; and

a controller that controls the transmission to connect the power shaft with the axle with restriction of rotation of the power shaft by at least one of the driving power source and the motor, in response to a change of a gearshift position from a parking position to a driving position.

2. The vehicle in accordance with claim 1, wherein the motor has a rotor connected to the power shaft and drives and rotates the rotor by a rotating magnetic field formed on a stator to input and output the power into and from the power shaft, and

the controller controls the transmission to connect the power shaft with the axle with execution of rotation restriction control, which controls the motor to fix a direction of the magnetic field formed on the stator and thereby restrict the rotation of the power shaft, in response to the change of the gearshift position from the parking position to the driving position.

3. The vehicle in accordance with claim 2, wherein the controller performs the rotation restriction control in a state of output of the power from the driving power source to the power shaft at a setting of the gearshift position to the parking position,

the controller controlling the transmission to connect the power shaft with the axle with continuation of the rotation restriction control, in response to a change of the gearshift position from the parking position to the driving position during execution of the rotation restriction control.

4. The vehicle in accordance with claim 2, the vehicle further having:

a vehicle speed sensor that measures a vehicle speed,

wherein the controller releases the rotation restriction control in an event of an increase in measured vehicle speed over a preset reference speed in the course of connection of the power shaft with the axle by the transmission with execution of the rotation restriction control in response to the change of the gearshift position from the parking position to the driving position.

5. The vehicle in accordance with claim 4, wherein the driving power source has a capability of regulating a rotation speed of the power shaft, and

the controller controls at least either of the driving power source and the motor to make the measured vehicle speed and the rotation speed of the power shaft satisfy a predetermined relation, on the occasion of release of the rotation restriction control in the course of connection of the power shaft with the axle by the transmission with execution of the rotation restriction control.

6. The vehicle in accordance with claim 2, wherein the controller controls the transmission to disconnect the power shaft from the axle with execution of the rotation restriction control, in response to a change of the gearshift position from the driving position to the parking position.

7. The vehicle in accordance with claim 2, wherein the driving power source has a capability of regulating a rotation speed of the power shaft, and

the controller controls the driving power source to output power and keep the rotation speed of the power shaft at a substantially 0 level, in unavailable state for required execution of the rotation restriction control.

8. The vehicle in accordance with claim 2, the vehicle further having:

a rotational position detector that detects a rotational position of the rotor of the motor,

wherein the controller executes the rotation restriction control, which sets the detected rotational position on a start of execution of the rotation restriction control to a control rotational position, supplies electric current to the motor based on the set control rotational position, and controls the motor to fix the direction of the magnetic field formed on the stator and thereby restrict the rotation of the power shaft.

9. The vehicle in accordance with claim 1, wherein the transmission has multiple clutches and changes an engagement state of the multiple clutches to enable transmission of power with a change of the speed between the power shaft and an axle and disconnection of the power shaft from the axle.

10. The vehicle in accordance with claim 1, wherein the driving power source has:

an internal combustion engine; and

an electric power-mechanical power input output structure that is connected to an output shaft of the internal combustion engine and to the power shaft and inputs and outputs power into and from the output shaft and the power shaft through input and output of electric power and mechanical power.

11. The vehicle in accordance with claim 10, wherein the electric power mechanical power input output structure has:

a three shaft-type power input output mechanism that is connected to three shafts, the output shaft of the internal combustion engine, the power shaft, and a third shaft and determines input and output of power into and from a remaining shaft based on input and output of powers into and from any two shafts among the three shafts; and

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

12. A vehicle, comprising:

a driving power source that outputs power to a power shaft;

a motor that inputs and outputs power into and from the power shaft;

a transmission that enables transmission of power with a change of a speed between the power shaft and an axle and disconnection of the power shaft from the axle; and

a controller that controls the transmission to disconnect the power shaft from the axle with restriction of rotation of the power shaft by at least one of the driving power source and the motor, in response to a change of a gearshift position from a driving position to a parking position.

13. The vehicle in accordance with claim 12, wherein the motor has a rotor connected to the power shaft and drives and rotates the rotor by a rotating magnetic field formed on a stator to input and output the power into and from the power shaft, and

the controller controls the transmission to disconnect the power shaft from the axle with execution of rotation restriction control, which controls the motor to fix a direction of the magnetic field formed on the stator and thereby restrict the rotation of the power shaft, in response to the change of the gearshift position from the driving position to the parking position.

14. The vehicle in accordance with claim 13, wherein the driving power source has a capability of regulating a rotation speed of the power shaft, and

the controller controls the driving power source to output power and keep the rotation speed of the power shaft at a substantially 0 level, in unavailable state for required execution of the rotation restriction control.

15. The vehicle in accordance with claim 13, the vehicle further having:

a rotational position detector that detects a rotational position of the rotor of the motor,

wherein the controller executes the rotation restriction control, which sets the detected rotational position on a start of execution of the rotation restriction control to a control rotational position, supplies electric current to the motor based on the set control rotational position, and controls the motor to fix the direction of the magnetic field formed on the stator and thereby restrict the rotation of the power shaft.

16. The vehicle in accordance with claim 12, wherein the transmission has multiple clutches and changes an engagement state of the multiple clutches to enable transmission of power with a change of the speed between the power shaft and an axle and disconnection of the power shaft from the axle.

17. The vehicle in accordance with claim 12, wherein the driving power source has:

an internal combustion engine; and

an electric power-mechanical power input output structure that is connected to an output shaft of the internal combustion engine and to the power shaft and inputs and outputs power into and from the output shaft and the power shaft through input and output of electric power and mechanical power.

18. The vehicle in accordance with claim 17, wherein the electric power mechanical power input output structure has:

a three shaft-type power input output mechanism that is connected to three shafts, the output shaft of the internal combustion engine, the power shaft, and a third shaft and determines input and output of power into and from a remaining shaft based on input and output of powers into and from any two shafts among the three shafts; and

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

19. A control method of a vehicle, which is equipped with a driving power source that outputs power to a power shaft, a motor that inputs and outputs power into and from the power shaft, and a transmission that enables transmission of power with a change of a speed between the power shaft and an axle and disconnection of the power shaft from the axle,

the control method controlling the transmission to connect the power shaft with the axle with restriction of rotation of the power shaft by at least one of the driving power source and the motor, in response to a change of a gearshift position from a parking position to a driving position.

20. A control method of a vehicle, which is equipped with a driving power source that outputs power to a power shaft, a motor that inputs and outputs power into and from the power shaft, and a transmission that enables transmission of power with a change of a speed between the power shaft and an axle and disconnection of the power shaft from the axle,

the control method controlling the transmission to disconnect the power shaft from the axle with restriction of rotation of the power shaft by at least one of the driving power source and the motor, in response to a change of a gearshift position from a driving position to a parking position.