Parallel hybrid electric vehicle power management system and adaptive power management method and program therefor

• US 8,612,078 B2
• Filed: 08/08/2011
• Issued: 12/17/2013
• 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.
• Primary Examiner(s): HOLLOWAY, JASON R
• Application Number:
  US13/205,191
• Publication Number:
  US 20130041530A1
• Time in Patent Office: 862 Days
• Field of Search: 701/22, 701/36, 701/48, 180/65.21, 180/65.25, 180/65.265, 180/65.28, 180/65.285, 180/65.29
• 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 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, wherein the total torque is controlled based on the received torque command and said combustion engine being on and contributing to the total torque.

2. The method for controlling a total torque in a hybrid electric vehicle according to claim 1, 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.

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

controlling the torque generated by said combustion engine based on the received torque command and the torque generated by said motor.