VEHICLE AND DRIVING SYSTEM FOR VEHICLE INSTALLATION

• US 20100100263A1
• Filed: 11/07/2007
• Published: 04/22/2010
• Est. Priority Date: 11/24/2006
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.), DENSO Corporation, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.), Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Aoki, Takeshi, Ueoka, Kiyoshiro, Okasaka, Kazuomi, Tajima, Yoichi
• Granted Patent: US 8,600,594 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• 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 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2210/20 AC to AC converters
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60L 2240/642 Slope of road
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2260/22 Standstill, e.g. zero speed
• CPC Class Codes: B60L 3/06 Limiting the traction current under mechanical overload conditions
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• 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 2510/081 Speed
• CPC Class Codes: B60W 2510/083 Torque
• CPC Class Codes: B60W 2510/087 Temperature
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/10 : Accelerator pedal position
• CPC Class Codes: B60W 2540/12 : Brake pedal position
• 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 2710/083 : Torque
• CPC Class Codes: B60W 2710/085 : Torque change rate
• CPC Class Codes: B60W 30/18036 : Reversing
• CPC Class Codes: B60W 30/18054 : at stand still, e.g. engine in idling state hill holding B60W30/18118
• CPC Class Codes: B60W 30/1843 : Overheating of driveline components B60W30/186 takes precedence
• CPC Class Codes: F16H 2037/0866 : Power split variators with distributing differentials, with the output of the CVT connected or connectable to the output shaft
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/64 : Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles

Abstract

On condition that output of a torque of not lower than a preset reference torque from a motor continues for at least a predetermined time period in a vehicle stop state with output of a corresponding torque from the a second motor based on a detected accelerator opening, a torque command of the second motor is set to decrease the output torque of said motor by a torque decrease rate, which is set according to the corresponding torque and the accelerator opening in the vehicle stop state (initial accelerator opening). After a changeover of a current crowding phase in the second motor, the torque command of said motor is set to increase the output torque of said motor by a torque increase rate, which is set according to the accelerator opening in the vehicle stop state.

Claims

1. A vehicle equipped with a motor arranged to output power to an axle, the vehicle comprising:

an accelerator operation amount detector configured to detect a driver'"'"'s accelerator operation amount;

a decrease rate setting module configured to set a decrease rate of an output torque from the motor, based on the detected accelerator operation amount;

an increase rate setting module configured to set an increase rate of the output torque from the motor, based on the detected accelerator operation amount; and

a controller configured to, on condition that there is no substantial change of the detected accelerator operation amount and that a predetermined torque decrease increase condition is satisfied in a vehicle stop state with output of a corresponding torque based on the detected accelerator operation amount from the motor, control the motor to decrease the output torque of the motor by the set decrease rate until a preset back motion of the vehicle and to increase the output torque of the motor up to the corresponding torque by the set increase rate after the preset back motion of the vehicle.

2. The vehicle in accordance with claim 1, wherein the decrease rate setting module sets the decrease rate to have an increasing tendency with an increase of the detected accelerator operation amount.

3. The vehicle in accordance with claim 1, wherein the decrease rate setting module sets the decrease rate to have an increasing tendency with an increase of the corresponding torque.

4. The vehicle in accordance with claim 1, wherein the increase rate setting module sets the increase rate to have an increasing tendency with an increase of the detected accelerator operation amount.

5. The vehicle in accordance with claim 1, wherein the predetermined torque decrease increase condition is that output of a torque of not lower than a preset reference torque from the motor continues for at least a predetermined time period.

6. The vehicle in accordance with claim 1, the vehicle further having:

an internal combustion engine arranged to output power to the axle.

7. A vehicle equipped with a motor arranged to output power to an axle, the vehicle comprising:

an accelerator operation amount detector configured to detect a driver'"'"'s accelerator operation amount;

a gradient-reflecting physical quantity detector configured to detect a gradient-reflecting physical quantity or a physical quantity reflecting a road surface slope;

a driving force demand setting module configured to set a driving force demand required for driving the vehicle, based on the detected accelerator operation amount; and

a controller configured to control the motor to output a torque based on the set driving force demand and, on condition that there is no substantial change of the detected accelerator operation amount and that a predetermined torque decrease increase condition is satisfied in a substantial vehicle stop state, control the motor to decrease the output torque of the motor by a first change rate until a preset back motion of the vehicle and to increase the output torque of the motor by a second change rate based on the detected accelerator operation amount and the detected gradient-reflecting physical quantity after the preset back motion of the vehicle.

8. The vehicle in accordance with claim 7, wherein the second change rate is set to have an increasing tendency with a decrease of the road surface slope estimated by the detected gradient-reflecting physical quantity and with an increase of the detected accelerator operation amount.

9. The vehicle in accordance with claim 7, wherein the first change rate is set based on the detected accelerator operation amount.

10. The vehicle in accordance with claim 7, wherein the first change rate is set based on the set driving force demand.

11. The vehicle in accordance with claim 7, wherein the predetermined torque decrease increase condition is that output of a torque of not lower than a preset reference torque from the motor continues for at least a predetermined time period.

12. A driving system that is installed on a vehicle and equipped with a motor arranged to output power to an axle, the driving system comprising:

an accelerator operation amount detector configured to detect a driver'"'"'s accelerator operation amount;

a decrease rate setting module configured to set a decrease rate of an output torque from the motor, based on the detected accelerator operation amount;

an increase rate setting module configured to set an increase rate of the output torque from the motor, based on the detected accelerator operation amount; and

a controller configured to, on condition that there is no substantial change of the detected accelerator operation amount and that a predetermined torque decrease increase condition is satisfied in a vehicle stop state with output of a corresponding torque based on the detected accelerator operation amount from the motor, control the motor to decrease the output torque of the motor by the set decrease rate until a preset back motion of the vehicle and to increase the output torque of the motor up to the corresponding torque by the set increase rate after the preset back motion of the vehicle.

13. A driving system that is installed on a vehicle and equipped with a motor arranged to output power to an axle, the driving system comprising:

an accelerator operation amount detector configured to detect a driver'"'"'s accelerator operation amount;

a gradient-reflecting physical quantity detector configured to detect a gradient-reflecting physical quantity or a physical quantity reflecting a road surface slope;

a driving force demand setting module configured to set a driving force demand required for driving the vehicle, based on the detected accelerator operation amount; and

a controller configured to control the motor to output a torque based on the set driving force demand and, on condition that there is no substantial change of the detected accelerator operation amount and that a predetermined torque decrease increase condition is satisfied in a substantial vehicle stop state, control the motor to decrease the output torque of the motor by a first change rate until a preset back motion of the vehicle and to increase the output torque of the motor by a second change rate based on the detected accelerator operation amount and the detected gradient-reflecting physical quantity after the preset back motion of the vehicle.