Method and system for adaptive motor power loss estimation in hybrid electric vehicles

• US 9,598,071 B2
• Filed: 03/21/2014
• Issued: 03/21/2017
• 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: Liang, Wei, Johri, Rajit, Wang, Xiaoyong, Yamazaki, Mark Steven, Kuang, Ming Lang, McGee, Ryan Abraham
• Primary Examiner(s): Almatrahi, Faris
• Assistant Examiner(s): Bendidi, Rachid
• Application Number:
  US14/221,476
• Publication Number:
  US 20150266466A1
• Time in Patent Office: 1,096 Days
• Field of Search: 701/22, 701/54, 701/55, 477/3, 180/65.1, 180/54.1, 180/65.21, 180/65.265, 180/65.28, 180/65.285, 180/65.8, 318/139, 318/140
• 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 system comprising:

a controller configured to operate a powertrain having a motor according to a motor power loss term based on an outputted motor power scaled by the mean of scaling factors, each scaling factor minimizing a difference, at a respective time instance, between measured battery power supplied to the motor and a sum of measured motor power scaled by the scaling factor and predefined motor power loss corresponding to the measured motor power.

2. The system of claim 1 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 measured motor power.

3. The system of claim 2 wherein:

the controller is further configured to employ a tables based algorithm to adapt the scaling factors to the mean of the scaling factors.

4. The system of claim 1 wherein:

the controller is further configured to employ a least mean square algorithm to adapt the scaling factors to the mean of the scaling factors.

5. The system of claim 1 wherein:

the controller is further configured to employ a recursive least mean square algorithm to adapt the scaling factors to the mean of the scaling factors.

6. The system of claim 1 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 predefined motor power loss from the map.

7. The system of claim 1 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.