Motor assistance for a hybrid vehicle based on user input

• US 8,606,443 B2
• Filed: 09/14/2010
• Issued: 12/10/2013
• Est. Priority Date: 09/15/2009
• Status: Expired due to Fees

• Current Assignee: KPIT Technologies Ltd.
• Original Assignee: KPIT Cummins Infosystems Limited
• Inventors: Kshatriya, Tejas Krishna, Pandit, S. B. (Ravi)
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): Lee, Tyler J
• Application Number:
  US12/882,001
• Publication Number:
  US 20110087391A1
• Time in Patent Office: 1,183 Days
• Field of Search: 701/22, 180 651- 6531
• US Class Current: 701/22
• CPC Class Codes: B60K 1/00 Arrangement or mounting of electrical propulsion units B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00; electric transmission arrangements B60K17/12; electric equipment or propulsion of electrically-propelled vehicles per se B60L; current-collectors for power supply lines of electrically-propelled vehicles B60L5/00
• CPC Class Codes: B60K 6/20 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
• CPC Class Codes: B60K 6/28 characterised by the electric energy storing means, e.g. batteries or capacitors
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/445 Temperature
• CPC Class Codes: B60L 50/00 Electric propulsion with power supplied within the vehicle with power supply from force of nature, e.g. sun or wind, B60L8/00; for monorail vehicles, suspension vehicles or rack railways B60L13/00
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• 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 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/11 using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance utilising navigation and traffic information in the control strategy B60W20/12
• CPC Class Codes: B60W 20/40 Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers power-up or power-down of the driveline B60W30/192
• CPC Class Codes: B60W 2050/0075 Automatic parameter input, automatic initialising or calibrating means
• CPC Class Codes: B60W 2050/143 Alarm means
• CPC Class Codes: B60W 2050/146 Display means
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0676 Engine temperature
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/10 : Accelerator pedal position
• CPC Class Codes: B60W 2556/10 : Historical data
• CPC Class Codes: B60W 50/0097 : Predicting future conditions
• CPC Class Codes: Y02T 10/40 : Engine management systems
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 10/84 : Data processing systems or methods, management, administration

Abstract

A method of providing assistance for an internal combustion engine in providing driving power for a vehicle using an electric motor coupled to the engine is provided. The method comprises selectively operating the motor to provide assistance to the engine at predetermined operating conditions of the engine. The assistance provided to the engine at one or more of the predetermined operating conditions is determined based on one of a plurality of motor assistance profiles. The motor assistance profile upon which the assistance is determined is selected from among the plurality of motor assistance profiles based on an expected driving range provided by a user of the vehicle.

Claims

1. A method of providing assistance to an internal combustion engine for a vehicle using an electric motor coupled to the engine, the method comprising:

selectively operating the motor to provide assistance to the engine at predetermined operating conditions of the engine, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is determined based on one of a plurality of motor assistance profiles, wherein the motor assistance profile upon which the assistance is determined is selected from among the plurality of motor assistance profiles based on an expected driving range provided by a user of the vehicle, the expected driving range indicating a distance the vehicle is expected to be driven before charging of a motor battery;

wherein each of the plurality of motor assistance profiles comprises a lookup table having stored therein a plurality of data elements, wherein each of the plurality of data elements is associated with a different combination of one or more linear speeds and one or more rotational speeds, and wherein the assistance provided to the engine at a particular linear speed and rotational speed is determined based at least in part on the data element of the selected motor assistance profile that is associated with the particular linear speed and rotational speed;

wherein a first motor assistance profile is selected when the expected driving range indicates that the vehicle is expected to be driven a first distance;

wherein a second motor assistance profile is selected when the expected driving range indicates that the vehicle is expected to be driven a second distance that is greater than the first distance; and

wherein the first motor assistance profile is configured to cause the motor to provide a different amount of assistance than the second motor assistance profile at one or more of the predetermined operating conditions of the engine.

2. The method of claim 1, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is determined based at least in part on an available energy level of an energy storage device configured to provide power to the electric motor, wherein the available energy level is based on the difference between a starting energy level and a minimum energy level, and wherein the minimum energy level is higher than a lowest possible energy level for the energy storage device such that the available energy level is less than a total energy that may be stored in the energy storage device.

3. The method of claim 2, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is determined based at least in part on an amount of energy expected to be regenerated over the expected driving range, wherein the amount of energy expected to be regenerated is predicted based on an amount of energy regenerated during one or more previous driving cycles.

4. The method of claim 2, further comprising monitoring a present energy level of the energy storage device, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is varied based on the present energy level.

5. The method of claim 4, wherein assistance to the engine is deactivated when the present energy level is below a minimum energy level.

6. The method of claim 5, further comprising reactivating assistance from the motor when assistance has been deactivated and the present energy level exceeds a threshold energy level.

7. The method of claim 2, wherein the motor assistance profile upon which the assistance is determined is selected from among the plurality of motor assistance profiles further based on the available energy level of the energy storage device.

8. The method of claim 1, wherein at least one of the plurality of the motor assistance profiles is generated by altering a default motor assistance profile based on the expected driving range provided by the user.

9. The method of claim 1, further comprising determining acceleration data for the vehicle based on input received from one or more sensors, wherein one or more control signals are configured to control the electric motor to provide at least one pulse of assistance at one or more times when the acceleration data indicates a demand for acceleration by operating the electric motor at a current above a continuous current rating of the electric motor.

10. The method of claim 1, wherein the electric motor is coupled to a crankshaft of the engine at a first side of the engine and a transmission is coupled to the crankshaft at a second side of the engine opposite the first side.

29. The method of claim 1, wherein a first average assistance amount provided to the engine when the first motor assistance profile is selected is greater than a second average assistance amount provided by the engine when the second motor assistance profile is selected.

30. The method of claim 1, further comprising generating the plurality of motor assistance profiles based on emissions data associated with an engine type of the engine across a range of operating conditions.

31. The method of claim 1, wherein the predetermined operating conditions upon which the plurality of motor assistance profiles are based comprise one or both of a gear position of a transmission of the vehicle and an acceleration of the vehicle.

32. The method of claim 1, further comprising selecting the motor assistance profile upon which the assistance is determined based on a selected mode of a plurality of modes, wherein the plurality of modes comprise an economy mode in which assistance is provided in a manner that increases fuel economy of the vehicle and a power mode in which assistance is provided in a manner that provides extra power for driving the vehicle.

33. The method of claim 1, further comprising selecting the motor assistance profile upon which the assistance is determined based on a date or a type of day.

34. The method of claim 1, further comprising selecting the motor assistance profile upon which the assistance is determined based on the expected driving range, an available energy level of an energy storage device configured to provide power to the electric motor, and a selected mode of a plurality of modes, wherein the plurality of modes comprise an economy mode in which assistance is provided in a manner that increases fuel economy of the vehicle and a power mode in which assistance is provided in a manner that provides extra power for driving the vehicle.

11. A motor controller, comprising:

one or more processors configured to execute instructions stored on one or more computer-readable media, wherein the instructions are executable by the one or more processors to selectively operate an electric motor to provide assistance to an internal combustion engine at predetermined operating conditions of the engine, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is determined based on one of a plurality of motor assistance profiles, and wherein the motor assistance profile upon which the assistance is determined is selected from among the plurality of motor assistance profiles based on an expected driving range provided by a user of the vehicle, the expected driving range indicating a distance the vehicle is expected to be driven before charging of a motor battery;

wherein each of the plurality of motor assistance profiles comprises a lookup table having stored therein a plurality of data elements, wherein each of the plurality of data elements is associated with a particular range of one or more operating conditions of the vehicle, and wherein the assistance provided to the engine at a particular set of operating conditions of the vehicle is determined based at least in part on the data element of the selected motor assistance profile that is associated with the particular set of operating conditions;

wherein a first motor assistance profile is selected when the expected driving range indicates that the vehicle is expected to be driven a first distance;

wherein a second motor assistance profile is selected when the expected driving range indicates that the vehicle is expected to be driven a second distance that is greater than the first distance; and

wherein the first motor assistance profile is configured to cause the motor to provide a different amount of assistance than the second motor assistance profile at one or more of the predetermined operating conditions of the engine.

12. The motor controller of claim 11, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is determined based at least in part on an available energy level of an energy storage device configured to provide power to the electric motor, wherein the available energy level is based on the difference between a starting energy level and a minimum energy level, and wherein the minimum energy level is higher than a lowest possible energy level for the energy storage device such that the available energy level is less than a total energy that may be stored in the energy storage device.

13. The motor controller of claim 12, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is determined based at least in part on an amount of energy expected to be regenerated over the expected driving range, and wherein the amount of energy expected to be regenerated is predicted based on an amount of energy regenerated during one or more previous driving cycles.

14. The motor controller of claim 12, wherein a present energy level of the energy storage device is monitored, and wherein the assistance provided to the engine at one or more of the predetermined operating conditions is varied based on the present energy level.

15. The motor controller of claim 14, wherein assistance to the engine is deactivated when the present energy level is below a minimum energy level.

16. The motor controller of claim 15, wherein assistance to the engine is reactivated when assistance has been deactivated and the present energy level exceeds a threshold energy level.

17. The motor controller of claim 12, wherein the motor assistance profile upon which the assistance is determined is selected from among the plurality of motor assistance profiles further based on the available energy level of the energy storage device.

18. The motor controller of claim 11, wherein acceleration data for the vehicle is determined based on input received from one or more sensors, wherein one or more control signals are configured to control the electric motor to provide at least one pulse of assistance at one or more times when the acceleration data indicates a demand for acceleration by operating the electric motor at a current above a continuous current rating of the electric motor.

19. The motor controller of claim 11, wherein the electric motor is coupled to a crankshaft of the engine at a first side of the engine and a transmission is coupled to the crankshaft at a second side of the engine opposite the first side.

20. A hybrid drive system for a vehicle, comprising:

an electric motor configured to provide assistance to an internal combustion engine to provide driving power for the vehicle; and

a controller configured to control an operation of an electric motor, wherein the controller comprises one or more processors configured to execute instructions stored on one or more computer-readable media;

wherein the instructions are executable by the one or more processors to selectively operate an electric motor to provide assistance to an internal combustion engine at predetermined operating conditions of the engine;

wherein the assistance provided to the engine at one or more of the predetermined operating conditions is determined based on one of a plurality of motor assistance profiles, wherein each of the plurality of motor assistance profiles comprises a plurality of data elements, wherein each of the plurality of data elements is associated with a different combination of at least one of one or more linear speeds or one or more rotational speeds, and wherein the assistance provided to the engine at one or more of a particular linear speed or a particular rotational speed is determined based at least in part on the data element of the selected motor assistance profile that is associated with the one or more of the particular linear speed and the particular rotational speed;

wherein the motor assistance profile upon which the assistance is determined is selected from among the plurality of motor assistance profiles based on an expected driving range provided by a user of the vehicle, the expected driving range indicating a distance the vehicle is expected to be driven before charging of a motor battery;

wherein a first motor assistance profile is selected when the expected driving range indicates that the vehicle is expected to be driven a first distance;

wherein a second motor assistance profile is selected when the expected driving range indicates that the vehicle is expected to be driven a second distance that is greater than the first distance; and

wherein the first motor assistance profile is configured to cause the motor to provide a different amount of assistance than the second motor assistance profile at one or more of the predetermined operating conditions of the engine.

21. The hybrid drive system of claim 20, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is determined based at least in part on an available energy level of an energy storage device configured to provide power to the electric motor, wherein the available energy level is based on the difference between a starting energy level and a minimum energy level, and wherein the minimum energy level is higher than a lowest possible energy level for the energy storage device such that the available energy level is less than a total energy that may be stored in the energy storage device.

22. The hybrid drive system of claim 21, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is determined based at least in part on an amount of energy expected to be regenerated over the expected driving range, and wherein the amount of energy expected to be regenerated is predicted based on an amount of energy regenerated during one or more previous driving cycles.

23. The hybrid drive system of claim 21, wherein a present energy level of the energy storage device is monitored, wherein the assistance provided to the engine at one or more of the predetermined operating conditions is varied based on the present energy level.

24. The hybrid drive system of claim 23, wherein assistance to the engine is deactivated when the present energy level is below a minimum energy level.

25. The hybrid drive system of claim 24, wherein assistance to the engine is reactivated when assistance has been deactivated and the present energy level exceeds a threshold energy level.

26. The hybrid drive system of claim 21, wherein the motor assistance profile upon which the assistance is determined is selected from among the plurality of motor assistance profiles further based on the available energy level of the energy storage device.

27. The hybrid drive system of claim 20, wherein acceleration data for the vehicle is determined based on input received from one or more sensors, wherein one or more control signals are configured to control the electric motor to provide at least one pulse of assistance at one or more times when the acceleration data indicates a demand for acceleration by operating the electric motor at a current above a continuous current rating of the electric motor.

28. The hybrid drive system of claim 20, wherein the electric motor is coupled to a crankshaft of the engine, wherein the electric motor is coupled to the crankshaft at a first side of the engine and a transmission is coupled to the crankshaft at a second side of the engine opposite the first side.