PARALLEL HYBRID ELECTRIC VEHICLE POWER MANAGEMENT SYSTEM AND ADAPTIVE POWER MANAGEMENT METHOD AND PROGRAM THEREFOR

• US 20130041530A1
• Filed: 08/08/2011
• Published: 02/14/2013
• Est. Priority Date: 08/08/2011
• Status: Active Grant

• Current Assignee: BAE Systems Controls Incorporated (BAE Systems Plc)
• Original Assignee: BAE Systems Controls Incorporated (BAE Systems Plc)
• Inventors: SCHULTE, Jurgen, MUGGEO, Filippo, MATTHEWS, Derek, PANCHERI, Brendan, HISSONG, Erin T.
• Granted Patent: US 8,612,078 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/48 Parallel 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 10/26 for electrical energy, e.g. batteries or capacitors
• 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 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 20/14 in conjunction with braking regeneration
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 2710/244 Charge state
• CPC Class Codes: B60W 30/18127 Regenerative braking
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y10S 903/93 Conjoint control of different elements

Abstract

A system, computer readable storage device and method for controlling torque in a hybrid electric vehicle. The method comprises determining a state of charge of an energy storage device, obtaining a reference state of charge, obtaining an error from a difference between the determined state of charge and the reference state of charge; and apportioning torque between a motor and an engine based upon the error. The motor is electrically coupled to the energy storage device and powered by the energy storage device. A state of charge (SOC) correction factor is determined based upon the error. The SOC correction factor is used to adjust a torque ratio of motor to engine torque that is determined for a given torque command.

Claims

1. A method for controlling torque in a hybrid electric vehicle comprising the steps of:

determining a state of charge of an energy storage device;

obtaining a reference state of charge

obtaining an error from a difference between said determined state of charge and said reference state of charge; and

apportioning torque between a motor and an engine based upon said error, said motor being electrically coupled to said energy storage device and powered by said energy storage device.

2. The method for controlling torque in a hybrid electric vehicle according to claim 1, wherein said reference state of charge is constant.

3. The method for controlling torque in a hybrid electric vehicle according to claim 1, wherein said reference state of charge is calculated using a reference plant model.

4. The method for controlling torque in a hybrid electric vehicle according to claim 1, further comprising the step of:

obtaining a state of charge correction factor based upon said error.

5. The method for controlling torque in a hybrid electric vehicle according to claim 4, further comprising the step of receiving a torque command and wherein said apportioning between said motor and said engine comprises:

determining a ratio of power from said motor and power from said engine based upon said received torque command; and

adjusting said ratio based upon said state of charge correction factor.

6. The method for controlling torque in a hybrid electric vehicle according to claim 1, further comprising a step of:

charging said energy storage device using only regenerative braking, said charging resulting in an increase in a state of charge for said energy storage device.

7. The method for controlling torque in a hybrid electric vehicle according to claim 1, wherein said motor uses only said charged energy from said regenerative braking without charging said energy storage device with power from said engine.

8. The method for controlling torque in a hybrid electric vehicle according to claim 4, further comprising the step of receiving a torque command and wherein said apportioning of torque between said motor and said engine comprises:

determining a torque contribution from said motor and from said engine based upon said received torque command; and

adjusting said motor torque contribution based upon said state of charge correction factor.

9. The method for controlling torque in a hybrid electric vehicle according to claim 4, further comprising the step of:

storing said state of charge correction factor.

10. The method for controlling torque in a hybrid electric vehicle according to claim 9, wherein said stored state of charge correction factor is associated with a type of drive cycle.

11. The method for controlling torque in a hybrid electric vehicle according to claim 10, further comprising the steps of:

receiving a reset request indicating a reset condition, said reset request including a new type of drive cycle;

retrieving a state of charge correction factor associated with the new type of drive cycle;

setting the state of charge correction factor to the retrieved state of charge correction factor; and

adjusting said motor torque contribution based upon said set state of charge correction factor.

12. The method for controlling torque in a hybrid electric vehicle according to claim 1, further comprising the steps of:

monitoring at least one operating parameter for said hybrid electric vehicle; and

adjusting the reference state of charge based upon said monitored at least one operating parameter.

13. The method for controlling torque in a hybrid electric vehicle according to claim 5, further comprising the steps of:

monitoring at least one operating parameter for said hybrid electric vehicle; and

adjusting the obtained state of charge correction factor based upon said monitored at least one operating parameter.

14. A method for controlling a total torque in a hybrid electric vehicle having an energy storage device, a motor and a combustion engine, said motor being electrically coupled to said energy storage device and driven by said energy storage device, and where the total torque is a function of a torque generated by the motor and the combustion engine, comprising the steps of:

charging said energy storage device by only using energy from regenerative braking generated when said motor acts as a generator;

receiving a torque command; and

controlling the torque generated by said motor by powering said motor using the charged energy from the regenerative braking when the torque command is received.

15. The method for controlling a total torque in a hybrid electric vehicle according to claim 14, further comprising the steps of:

determining a state of charge of the energy storage device;

obtaining a reference state of charge;

obtaining an error from a difference between said determined state of charge and said reference state of charge; and

adjusting the torque generated by said motor based upon said error.

16. A computer readable storage device storing a computer readable program for causing a computer to execute a method for controlling the torque in a hybrid electric vehicle, said method comprising the steps of:

determining a state of charge of an energy storage device;

obtaining a reference state of charge;

obtaining an error from a difference between said determined state of charge and said reference state of charge; and

apportioning torque between a motor and an engine based upon said error, said motor being electrically coupled to said energy storage device and powered by said energy storage device.

17. A torque control system comprising:

a combustion engine;

an energy storage device;

a motor controller coupled to said energy storage device;

a motor/generator coupled to said motor controller; and

a system controller for apportioning torque between said motor/generator and said engine based upon a difference between a determined state of charge of said energy storage device and a reference state of charge, said motor controller controls said motor/generator based upon using power from said energy storage device.