Hybrid vehicle launch control

• US 9,067,593 B2
• Filed: 03/08/2013
• Issued: 06/30/2015
• Est. Priority Date: 03/08/2013
• Status: Expired due to Fees

• 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:
  US13/791,458
• Publication Number:
  US 20140257609A1
• Time in Patent Office: 844 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 launch control system for launching a hybrid vehicle comprising:

a plurality of wheels having a wheel speed and a wheel torque;

an engine having an engine speed and an engine torque and configured to provide power to the plurality of wheels;

a motor-generator configured to provide power to the plurality of wheels;

a memory configured to store engine data and wheel slip data;

a processor configured to regulate the engine and the motor-generator to control the engine speed and the engine torque independently from the wheel speed and the wheel torque; and

an actuation device having an on state and an off state,

wherein the wheel speed and the wheel torque are substantially 0 during the on state, and the engine speed and the engine torque are applied to the plurality of wheels based on the engine data and the wheel slip data when the actuation device is switched from the on state to the off state.

2. The launch control system of claim 1, wherein the processor is further configured to blend the power from the engine and the power from the motor-generator to the plurality of wheels when the actuation device is switched from the on state to the off state to maximize an acceleration of the hybrid vehicle.

3. The launch control system of claim 1, wherein the engine speed that is applied to the plurality of wheels when the actuation device is in the on state is higher than a maximum available engine speed when the hybrid vehicle is stopped and the actuation device is in the off state.

4. The launch control system of claim 1, further comprising an accelerator pedal and an accelerator pedal sensor configured to detect a position of the accelerator pedal, wherein the engine speed and the engine torque corresponds to the position of the accelerator pedal.

5. The launch control system of claim 1, further comprising an accelerator pedal and an accelerator pedal sensor configured to detect a position of the accelerator pedal, wherein the processor applies the engine speed and the engine torque when the accelerator pedal is pressed beyond a pedal threshold.

6. The launch control system of claim 1, wherein the actuation device comprises a button.

7. The launch control system of claim 6, wherein the button is configured to send a brake signal.

8. A hybrid vehicle comprising:

a plurality of wheels having a wheel speed and a wheel torque;

an engine having an engine speed and an engine torque and configured to provide power to the plurality of wheels;

a motor-generator configured to provide power to the plurality of wheels;

an accelerator pedal;

an accelerator pedal sensor configured to detect an accelerator pedal position, wherein the accelerator pedal position controls the engine speed and the engine torque;

a brake pedal;

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

a memory configured to store engine data and wheel slip data; and

a processor configured to regulate the engine and the motor-generator to control the engine speed and the engine torque independently from the wheel speed and the wheel torque,

wherein the engine speed and the engine torque are not applied to the plurality of wheels when the brake pedal is in an applied position such that the wheel speed and the wheel torque are substantially 0 when the brake pedal is in the applied position, and the engine speed and the engine torque are applied to the plurality of wheels based on the engine data and wheel slip data when the brake pedal is changed from the applied position to a released position in order to perform a launch of the hybrid vehicle.

9. The hybrid vehicle of claim 8, further comprising a display configured to display a launch result summary of the launch.

10. The hybrid vehicle of claim 8, wherein the engine speed that is applied to the plurality of wheels when the brake pedal is in the applied position is higher than a maximum available engine speed when the hybrid vehicle is stopped and the brake pedal is in the released position.

11. The hybrid vehicle of claim 8, wherein the processor is further configured to adjust the engine speed and the engine torque applied to the plurality of wheels to optimize a wheel slip.

12. The hybrid vehicle of claim 8, further comprising an accelerometer for detecting an acceleration of the hybrid vehicle, wherein the processor is further configured to control the engine speed and the engine torque applied to the plurality of wheels based on the acceleration.

13. The hybrid vehicle of claim 8, further comprising a speed sensor for detecting a speed of the hybrid vehicle, wherein the processor is further configured to control the engine speed and the engine torque applied to the plurality of wheels based on the speed.

14. The hybrid vehicle of claim 8, further comprising a button configured to send a signal to the processor to activate a launch control logic.

15. A method to launch a hybrid vehicle comprising:

receiving an activation signal for a launch control logic;

receiving an on signal for an actuation device;

in response to the on signal, controlling an engine speed and an engine torque of an engine independently of a wheel speed and a wheel torque of a plurality of wheels such that the wheel speed and the wheel torque are substantially 0, the engine speed and the engine torque controlled based on engine data and wheel slip data;

increasing the engine speed and the engine torque;

receiving an off signal for the actuation device;

in response to the off signal, applying the engine speed and the engine torque to the plurality of wheels based on the engine data and the wheel slip data to perform a launch; and

updating the engine data and the wheel slip data.

16. The method of claim 15, wherein the increasing the engine speed increases the engine speed higher than a maximum available engine speed when the hybrid vehicle is stopped and the launch control logic is inactive.

17. The method of claim 15, wherein the applying the engine speed and the engine torque to the plurality of wheels further comprises optimizing a wheel slip.

18. The method of claim 15, further comprising holding the hybrid vehicle to a stop prior to the receiving the off signal.

19. The method of claim 15, wherein the receiving the activation signal and the receiving the on signal occurs substantially concurrently.

20. The method of claim 15, wherein the updating the engine data and the wheel slip data further comprises storing launch performance data to maximize acceleration in subsequent launches.