Hybrid vehicle launch control

• US 9,340,200 B2
• Filed: 06/24/2015
• Issued: 05/17/2016
• Est. Priority Date: 03/08/2013
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Dufford, Mohammad E.
• Primary Examiner(s): FREJD, RUSSELL WARREN
• Application Number:
  US14/748,668
• Publication Number:
  US 20150291153A1
• Time in Patent Office: 328 Days
• Field of Search: 701/22, 701/54, 701/60, 701/67, 903/930, 477/70, 477/71, 477/73, 477/83, 477/84, 477/90, 477/91, 180/65.265, 180/65.275, 180/65.28
• US Class Current: 1/1
• 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: 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 10/105 of electric type
• CPC Class Codes: B60W 20/15 Control strategies specially adapted for achieving a particular effect
• CPC Class Codes: B60W 20/19 for achieving enhanced acceleration
• CPC Class Codes: B60W 2050/0075 Automatic parameter input, automatic initialising or calibrating means
• CPC Class Codes: B60W 2050/146 Display means
• CPC Class Codes: B60W 2520/26 Wheel slip
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 2556/00 Input parameters relating to data
• CPC Class Codes: B60W 2556/10 Historical data
• CPC Class Codes: B60W 2710/0644 Engine speed
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 2710/086 Power
• CPC Class Codes: B60W 2710/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2720/28 Wheel speed
• CPC Class Codes: B60W 2720/30 : Wheel torque
• CPC Class Codes: B60W 30/18 : Propelling the vehicle
• CPC Class Codes: B60W 30/18027 : Drive off, accelerating from standstill
• CPC Class Codes: B60W 50/06 : Improving the dynamic response of the control system, e.g. improving the speed of regulation or avoiding hunting or overshoot
• CPC Class Codes: B60W 50/082 : Selecting or switching between different modes of propelling
• CPC Class Codes: B60W 50/14 : Means for informing the driver, warning the driver or prompting a driver intervention
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y10S 903/93 : Conjoint control of different elements

Abstract

A launch control system which maximizes hybrid vehicle acceleration from a standing start. A hybrid vehicle includes wheels, an engine, a motor-generator, a processor, and an actuation device. The processor controls an engine speed and an engine torque independently from a wheel speed and a wheel torque. While the hybrid vehicle is at a standstill, the actuation device is switched to an on state, and the engine speed and engine torque is raised to optimal values. When the actuation device is subsequently switched to an off state, the engine speed and the engine torque is applied to the plurality of wheels to launch the hybrid vehicle. The processor blends or further adjusts the torque applied to the plurality of wheels to maximize the acceleration while optimizing an amount of wheel slip. The processor then learns the launch to improve performance on subsequent launches.

Claims

1. A hybrid vehicle comprising:

a launch actuation device having at least an off state or mode and a launch preparation state or mode;

at least two wheels having a wheel speed or wheel torque;

a continuously variable transmission coupled to the at least two wheels;

an engine coupled to the continuously variable transmission and having an engine output speed or torque;

a battery for storing electrical energy;

a motor coupled to the continuously variable transmission and configured to provide an output power or output torque using the electrical energy stored in the battery;

a memory configured to store engine data; and

an electronic control unit coupled to at least the launch actuation device, the engine, the continuously variable transmission, the motor, and the memory, wherein when or after the launch actuation device switches from the off state or mode to the launch preparation state or mode, the electronic control unit is configured to increase the engine output speed or torque and adjust the output power or output torque of the motor based on the engine data and temporarily set or maintain the wheel speed or wheel torque to be substantially zero during the launch preparation state or mode.

2. The hybrid vehicle of claim 1, wherein the launch actuation device further has a launch state or mode, wherein when or after the launch actuation device switches from the launch preparation state or mode to the launch state or mode, the electronic control unit is further configured to:

apply, using the continuously variable transmission, the engine output speed or torque to the at least two wheels for launching an acceleration of the hybrid vehicle, and

apply, using the continuously variable transmission, the output power or output torque of the motor to the at least two wheels for assisting the engine in launching the acceleration of the hybrid vehicle.

3. The hybrid vehicle of claim 2, further comprising a display configured to display launch result data corresponding to at least an increase in a speed of the hybrid vehicle during the launch state or mode.

4. The hybrid vehicle of claim 2, wherein when or after the launch actuation device switches from the launch preparation state or mode to the launch state or mode, the electronic control unit is configured to increase the output torque of the motor, the output torque of the motor supplementing the engine output torque for rotating the at least two wheels.

5. The hybrid vehicle of claim 2, wherein the electronic control unit is configured to store launch data in the memory during the launch state or mode, the launch data corresponding to at least one of a speed of the hybrid vehicle, the engine output speed or torque, or the output power or output torque of the motor, for enhancing control of the engine output speed or torque during subsequent launches based on the stored launch data.

6. The hybrid vehicle of claim 2, wherein the launch actuation device is configured to receive or detect an input from a finger or a hand of a driver of the hybrid vehicle, the input corresponding to at least one of the off state or mode, the launch preparation state or mode, or the launch state or mode.

7. The hybrid vehicle of claim 1, wherein the continuously variable transmission includes a plurality of gears forming a planetary gear set having at least one gear ratio, and when or after the launch actuation device switches from the off state or mode to the launch preparation state or mode, the electronic control unit is configured to adjust the at least one gear ratio to allow the engine output speed or torque to be increased while the wheel speed or wheel torque is maintained to be substantially zero during the launch preparation state or mode.

8. The hybrid vehicle of claim 1, wherein the launch actuation device corresponds to or includes a brake pedal, the hybrid vehicle further comprising:

a brake pedal sensor configured to detect a position of the brake pedal;

an accelerator pedal; and

an accelerator pedal sensor configured to detect a position of the accelerator pedal,

wherein the launch preparation state or mode corresponds to the brake pedal being in an applied position and the accelerator pedal being in an applied position.

9. The hybrid vehicle of claim 1, wherein the launch actuation device corresponds to or includes a brake pedal, the hybrid vehicle further comprising:

a brake pedal sensor configured to detect a brake application percentage or amount of the brake pedal;

an accelerator pedal; and

an accelerator pedal sensor configured to detect an accelerator application percentage or amount of the accelerator pedal,

wherein the launch preparation state or mode corresponds to the brake application percentage or amount being greater than or equal to a brake application threshold percentage or amount and the accelerator application percentage or amount being greater than or equal to an accelerator application threshold percentage or amount.

10. The hybrid vehicle of claim 2, further comprising an accelerometer for detecting an acceleration of the hybrid vehicle, wherein in the launch state or mode, the electronic control unit is further configured to apply, using the continuously variable transmission, the engine output speed or torque to the at least two wheels based on the detected acceleration.

11. The hybrid vehicle of claim 1, wherein when or after the launch actuation device switches from the off state or mode to the launch preparation state or mode, the electronic control unit is configured to adjust the output torque of the motor to temporarily counter the engine output torque, thereby temporarily setting or maintaining the wheel speed or wheel torque to be substantially zero during the launch preparation state or mode.

12. The hybrid vehicle of claim 1, wherein the launch actuation device is configured to detect an input value corresponding to an actuation degree or level selected from a plurality of actuation degrees or levels, and wherein the electronic control unit is configured to increase the engine output speed or torque based on the engine data and the selected actuation degree or level.

13. The hybrid vehicle of claim 1, further comprising a speed sensor for detecting a speed of the hybrid vehicle, wherein when or after the launch actuation device switches from the launch preparation state or mode to the launch state or mode, the electronic control unit is configured to increase the engine output speed or torque based on the detected speed of the hybrid vehicle.

14. A method of initiating and executing a launch operation for a hybrid vehicle having at least two wheels, a continuously variable transmission coupled to the at least two wheels, an engine coupled to the continuously variable transmission, and a motor coupled to the continuously variable transmission, the method comprising:

storing engine data in a memory communicatively coupled to an electronic control unit that is coupled to the continuously variable transmission, the engine, and the motor;

detecting, using a brake pedal sensor, a brake application percentage or amount of a brake pedal;

detecting, using an accelerator pedal sensor, an accelerator application percentage or amount of an accelerator pedal;

setting, using the electronic control unit, a current launch control state or mode of the hybrid vehicle to a launch preparation state or mode when or after the brake application percentage or amount is greater than or equal to a brake application threshold percentage or amount and the accelerator application percentage or amount is greater than or equal to an accelerator application threshold percentage or amount;

increasing, using the electronic control unit, an engine output speed or torque of the engine based on the engine data when or after the current launch control state or mode is set to the launch preparation state or mode;

adjusting, using the electronic control unit, an output power or an output torque of the motor when or after the current launch control state or mode is set to the launch preparation state or mode, the output power or the output torque of the motor being provided using electrical energy stored in a battery; and

temporarily setting or maintaining, using the electronic control unit, a wheel speed or a wheel torque to be substantially zero when or after the current launch control state or mode is set to the launch preparation state or mode.

15. The method of claim 14, further comprising:

setting, using the electronic control unit, the current launch control state or mode of the hybrid vehicle to a launch state or mode when or after the brake application percentage or amount is less than or equal to a second brake application threshold percentage or amount; and

applying, using the electronic control unit, the engine output speed or torque to the at least two wheels for launching an acceleration of the hybrid vehicle when or after the current launch control state or mode of the hybrid vehicle switches from the launch preparation state or mode to the launch state or mode.

16. The method of claim 15, further comprising applying, using the electronic control unit, the output power or the output torque of the motor to the at least two wheels for assisting the engine in launching the acceleration of the hybrid vehicle, when or after the current launch control state or mode of the hybrid vehicle switches from the launch preparation state or mode to the launch state or mode.

17. The method of claim 14, wherein the step of adjusting, using the electronic control unit, the output power or output torque of the motor includes adjusting, using the electronic control unit, the output torque of the motor to temporarily counter the engine output torque for setting or maintaining the wheel speed or wheel torque to be substantially zero during the launch preparation state or mode.

18. The method of claim 14, wherein an amount of increase in the engine output speed or torque of the engine varies based on the brake application percentage or amount and the accelerator application percentage or amount.

19. A method of initiating and executing a launch operation for a hybrid vehicle having a launch actuation device configured to receive or detect an input from a finger or a hand of a driver of the hybrid vehicle, at least two wheels, a continuously variable transmission coupled to the at least two wheels, an engine coupled to the continuously variable transmission, and a motor coupled to the continuously variable transmission, the method comprising:

storing engine data in a memory communicatively coupled to an electronic control unit that is coupled to the continuously variable transmission, the engine, and the motor;

detecting or receiving, using the launch actuation device, a first input corresponding to a launch preparation state or mode;

increasing, using the electronic control unit, an engine output speed or torque of the engine based on the engine data, when or after the first input is detected or received;

adjusting, using the electronic control unit, an output power or an output torque of the motor when or after the first input is detected or received, the output power or the output torque of the motor being provided using electrical energy stored in a battery;

temporarily setting or maintaining, using the electronic control unit, a wheel speed or a wheel torque of the at least two wheels to be substantially zero, during the launch preparation state or mode;

detecting or receiving, using the input device, a second input corresponding to a launch state or mode; and

applying, using the electronic control unit, the engine output speed or torque to the at least two wheels for launching an acceleration of the hybrid vehicle, when or after the second input is detected or received.

20. The method of claim 19, further comprising applying, using the electronic control unit, the output power or the output torque of the motor to the at least two wheels for assisting the engine in launching the acceleration of the hybrid vehicle during the launch state or mode.