Method and System for Adaptive Motor Power Loss Estimation in Hybrid Electric Vehicles

• US 20150266466A1
• Filed: 03/21/2014
• Published: 09/24/2015
• Est. Priority Date: 03/21/2014
• Status: Active Grant

• Current Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Original Assignee: Ford Global Technologies, LLC (Ford Motor Company)
• Inventors: Johri, Rajit, Liang, Wei, Wang, Xiaoyong, Yamazaki, Mark Steven, Kuang, Ming Lang, McGee, Ryan Abraham
• Granted Patent: US 9,598,071 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60K 2006/4825 Electric machine connected or connectable to gearbox input shaft
• 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 10/26 for electrical energy, e.g. batteries or capacitors
• 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 2050/0014 Adaptive controllers
• CPC Class Codes: B60W 2050/0024 Variable gains
• CPC Class Codes: B60W 2050/0025 Transfer function weighting factor
• CPC Class Codes: B60W 2050/0026 Lookup tables or parameter maps
• CPC Class Codes: B60W 2050/005 Sampling
• CPC Class Codes: B60W 2510/081 Speed
• CPC Class Codes: B60W 2510/083 Torque
• CPC Class Codes: B60W 2710/086 Power
• CPC Class Codes: B60W 30/188 Controlling power parameters of the driveline, e.g. determining the required power
• CPC Class Codes: B60W 40/12 related to parameters of the vehicle itself , e.g. tyre models
• 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
• CPC Class Codes: Y10S 903/93 Conjoint control of different elements

Abstract

A control strategy for a hybrid electric vehicle powertrain having an engine, a motor, and a transmission includes operating the powertrain according to a motor power loss term that is adapted based on battery power supplied to the motor, motor power output, and an estimated motor power loss such that the motor power loss term changes over time and converges to a constant value to thereby be indicative of actual motor power loss.

Claims

1. A method for a powertrain having an engine, a motor, and a transmission, comprising:

operating the powertrain according to a motor power loss term that is adapted based on battery power supplied to the motor, motor power output, and an estimated motor power loss such that the motor power loss term changes over time and converges to a constant value to thereby be indicative of actual motor power loss.

2. The method of claim 1 further comprising:

adapting the motor power loss term based on a difference between the battery power supplied to the motor and a sum of the motor power output and the estimated motor power loss such that the motor power loss term changes over time and converges to the constant value.

3. The method of claim 2 further comprising:

detecting torque and speed of the motor using at least one sensor in communication with the motor, wherein a product of the motor torque and the motor speed is the motor power output.

4. The method of claim 3 further comprising:

adapting the motor power loss term includes employing a least mean square algorithm using (i) the difference and (ii) the motor torque and the motor speed.

5. The method of claim 3 further comprising:

adapting the motor power loss term includes employing a recursive least squares algorithm using the motor torque and the motor speed.

6. The method of claim 3 wherein:

adapting the motor power loss term includes employing a tables based algorithm using the motor torque and the motor speed.

7. The method of claim 2 further comprising:

operating the powertrain according to a correction motor power loss in lieu of the motor power loss term until the motor power loss term converges to the constant value, the correction motor power loss term being based on the difference and the motor power loss term.

8. The method of claim 1 further comprising:

obtaining the estimated motor power loss from a map having a plurality of estimated motor power losses in correspondence with a plurality of motor operating points.

9. The method of claim 1 further comprising:

detecting torque and speed of the motor using at least one sensor in communication with the motor; and

obtaining the estimated motor power loss from a map having a plurality of estimated motor power losses in correspondence with a plurality of motor operating points, each motor operating point having a corresponding pair of motor torque and motor speed.

10. The method of claim 1 further comprising:

detecting voltage and current of the battery using a sensor in communication with a battery which supplies the battery power supplied to the motor, wherein a product of the battery voltage and the battery current is the battery power supplied to the motor.

11. A system for a powertrain having an engine, a motor, and a transmission, comprising:

a controller configured to operate the powertrain according to a motor power loss term that is adapted based on battery power supplied to the motor, motor power output, and an estimated motor power loss such that the motor power loss term changes over time and converges to a constant value to thereby be indicative of actual motor power loss.

12. The system of claim 11 wherein:

the controller is further configured to adapt the motor power loss term based on a difference between the battery power supplied to the motor and a sum of the motor power output and the estimated motor power loss such that the motor power loss term changes over time and converges to the constant value.

13. The system of claim 12 further comprising:

at least one sensor configured to detect torque and speed of the motor;

wherein the controller is further configured to use a product of the motor torque and the motor speed as the motor power output.

14. The system of claim 13 wherein:

the controller is further configured to adapt the motor power loss term employing a least mean square algorithm using (i) the difference and (ii) the motor torque and the motor speed.

15. The system of claim 13 wherein:

the controller is further configured to adapt the motor power loss term employing a recursive least squares algorithm using the motor torque and the motor speed.

16. The system of claim 13 wherein:

the controller is further configured to adapt the motor power loss term includes employing a tables based algorithm using the motor torque and the motor speed.

17. The system of claim 12 wherein:

the controller is further configured to operate the powertrain according to a correction motor power loss in lieu of the motor power loss term until the motor power loss term converges to the constant value, the correction motor power loss term being based on the difference and the motor power loss term.

18. The system of claim 11 further comprising:

a map having a plurality of estimated motor power losses in correspondence with a plurality of motor operating points;

wherein the controller is further configured to obtain the estimated motor power loss from the map.

19. The system of claim 11 further comprising:

a sensor configured to detect torque and speed of the motor; and

a map having a plurality of estimated motor power losses in correspondence with a plurality of motor operating points, each motor operating point having a corresponding pair of motor torque and motor speed;

wherein the controller is further configured to obtain the estimated motor power loss from the map by using the motor torque and the motor speed.

20. The system of claim 11 further comprising:

a battery configured to supply the battery power supplied to the motor; and

a sensor configured to detect voltage and current of the battery, wherein the controller is further configured to use a product of the battery voltage and the battery current as the battery power supplied to the motor.