ABNORMALITY DETECTING DEVICE, ABNORMALITY DETECTING METHOD, AND COMPUTER READABLE MEDIUM STORING AN ABNORMALITY DETECTING PROGRAM

• US 20080125932A1
• Filed: 11/20/2007
• Published: 05/29/2008
• Est. Priority Date: 11/29/2006
• Status: Active Grant

• Current Assignee: Panasonic EV Energy Company, Limited (Toyota Motor Corporation)
• Original Assignee: Panasonic EV Energy Company, Limited (Toyota Motor Corporation)
• Inventors: Yamabe, Norito, Togashi, Kouta
• Granted Patent: US 8,148,993 B2
• Time in Patent Office: Days
• US Class Current: 701/29
• 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 6/365 with the gears having orbital motion
• 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 20/50 Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
• CPC Class Codes: B60W 2510/242 for electrical energy
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 2510/248 Age of storage means
• CPC Class Codes: B60W 50/0205 Diagnosing or detecting failures; Failure detection models
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

An abnormality of a current sensor or a voltage sensor is detected. An abnormality detecting section reads out a charging/discharging current I of a secondary battery detected by the current sensor and a battery voltage V of the secondary battery, calculates an estimated battery voltage Vs on the basis of an electromotive force E and an internal resistance r of the secondary battery, and judges the current sensor to be abnormal if the difference between the battery voltage V and the estimated battery voltage Vs is greater than a predetermined threshold and the charging/discharging current I exceeds a predetermined allowable range, and judges the voltage sensor to be abnormal if the difference is greater than the predetermined threshold and the charging/discharging current I is within the predetermined allowable range.

Claims

1. An abnormality detecting device for detecting an abnormality in at least either a current sensor for detecting a charging/discharging current flowing to a secondary battery or a voltage sensor for detecting a battery voltage of said secondary battery, comprising:

an electromotive force calculating section for calculating an electromotive force E of said secondary battery with at least a charging/discharging current I of said secondary battery detected by said current sensor as a parameter;

an estimated voltage calculating section for calculating an estimated battery voltage Vs on the basis of said electromotive force and an internal resistance r of said secondary battery; and

an abnormality judgment section for comparing the battery voltage V of the secondary battery detected by said voltage sensor and said estimated battery voltage Vs, and if a difference thereof is greater than a predetermined threshold, judging that at least either said current sensor or said voltage sensor is abnormal.

2. An abnormality detecting device according to claim 1, wherein:

said abnormality judgment section, if said difference is greater than the predetermined threshold and the charging/discharging current I of said secondary battery detected by said current sensor exceeds a predetermined allowable range, judges that said current sensor is abnormal.

3. An abnormality detecting device according to claim 1, wherein:

said abnormality judgment section, if said difference is greater than the predetermined threshold and the charging/discharging current I of said secondary battery detected by said current sensor is within the predetermined allowable range, judges that said voltage sensor is abnormal.

4. An abnormality detecting method for detecting an abnormality in at least either a current sensor for detecting a charging/discharging current flowing to a secondary battery or a voltage sensor for detecting a battery voltage of said secondary battery, comprising:

a calculating step for calculating an electromotive force E of said secondary battery with at least a charging/discharging current I of said secondary battery detected by said current sensor as a parameter;

a calculating step for calculating an estimated battery voltage Vs on the basis of said electromotive force and an internal resistance r of said secondary battery; and

a step for comparing the battery voltage V of the secondary battery detected by said voltage sensor and said estimated battery voltage Vs, and if a difference thereof is greater than a predetermined threshold, judging that at least either said current sensor or said voltage sensor is abnormal.

5. A computer readable medium storing a program causing a computer to execute a process for detecting an abnormality of a current sensor for detecting a current flowing to a secondary battery, said process comprising:

calculating an electromotive force E of said secondary battery with at least a charging/discharging current I of said secondary battery detected by said current sensor as a parameter;

calculating an estimated battery voltage Vs on the basis of said electromotive force and an internal resistance r of said secondary battery; and

comparing the battery voltage V of the secondary battery detected by said voltage sensor and said estimated battery voltage Vs, and if a difference thereof is greater than a predetermined threshold, judging that at least either said current sensor or said voltage sensor is abnormal.