Remaining charge detection device for power storage unit

• US 6,441,619 B1
• Filed: 07/25/2001
• Issued: 08/27/2002
• Est. Priority Date: 07/28/2000
• Status: Expired due to Fees

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Yamada, Yasuo, Maruno, Naoki, Araki, Kazuhiro
• Primary Examiner(s): TOATLEY, GREGORY J
• Application Number:
  US09/911,396
• Publication Number:
  US 20020030494A1
• Time in Patent Office: 398 Days
• Field of Search: 320/132, 320/134, 320/136, 324/427, 324/429
• US Class Current: 324/427
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: G01R 31/3828 using current integration
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: G01R 31/392 Determining battery ageing or deterioration, e.g. state of health

Abstract

A remaining charge detection device for a power storage unit including a current detection unit which detects the current value of a charging current and a discharging current of a power storage unit; a voltage detection unit which detects the voltage value of a terminal voltage of the power storage unit; and a current accumulation remaining charge calculation means which accumulates the current value detected by the current detection unit to obtain an accumulated charging current and discharging current and calculates a remaining charge of the power storage unit. The remaining charge detection device further includes a no-load state detection unit which detects a no-load state of the power storage unit, and a remaining charge for calibration calculation unit which calculates a remaining charge for calibration for the remaining charge of the power storage unit.

Claims

1. A remaining charge detection device for a power storage unit including:

a current detection unit which detects the current value of a charging current and a discharging current of a power storage unit;

a voltage detection unit which detects the voltage value of a terminal voltage of said power storage unit; and

a current accumulation remaining charge calculation means which accumulates the current value detected by said current detection unit to obtain an accumulated charging current and an accumulated discharging current and, based on said accumulated charging current and said accumulated discharging current, calculates a remaining charge of said power storage unit, said remaining charge detection device further comprising;

a no-load state detection unit which detects a no-load state of said power storage unit; and

a remaining charge for calibration calculation unit which calculates, according to the voltage value detected in the no-load state of said power storage unit, a remaining charge for calibration with respect to said remaining charge of said power storage unit.

2. A remaining charge detection device for a power storage unit according to claim 1, further comprising:

a standard remaining charge calibration unit which calibrates, based on said remaining charge for calibration calculated by said remaining charge for calibration calculation unit, a predetermined standard remaining charge which may be used when said remaining charge of said power storage unit is expressed as a percentage with respect to said predetermined standard remaining charge.

3. A control device for a hybrid vehicle including an engine which outputs a driving force for the hybrid vehicle, a motor which assists an output of the engine in accordance with a driving state of the hybrid vehicle, and a power storage unit which stores energy generated by the motor used as a generator and regenerative energy obtained by a regenerative operation of said motor when said hybrid vehicle is decelerating, said control device for a hybrid vehicle comprising:

a remaining charge detection device for said power storage unit, including;

a current detection unit which detects the current value of a charging current and a discharging current of said power storage unit;

a voltage detection unit which detects the voltage value of a terminal voltage of said power storage unit;

a current accumulation remaining charge calculation means which calculates the accumulation of the current value detected by said current detection unit to obtain an accumulated charging current and an accumulated discharging current and, based on said accumulated charging current and said accumulated discharging current, calculates a remaining charge of said power storage unit;

a no-load state generation unit which creates a no-load state of said power storage unit by terminating the output assistance of said engine by said motor and the regenerative operation of said motor;

a no-load state detection unit which detects the no-load state of said power storage unit; and

a remaining charge for calibration calculation unit which calculates, according to the voltage value detected in the no-load state of said power storage unit, a remaining charge for calibration with respect to said remaining charge of said power storage unit.

4. A control device for a hybrid vehicle according to claim 3, wherein

said current accumulation remaining charge calculation means calculates a remaining charge of said power storage unit while said hybrid vehicle is in a running mode.

5. A control device for a hybrid vehicle according to claim 3, further comprising:

a remaining charge correction unit which retains a predetermined remaining charge that has been set in accordance with a predetermined voltage value, current value, and temperature for said power storage unit, said remaining charge correction unit being capable of setting, when said voltage value detected by said voltage detection unit reaches said predetermined voltage value, said predetermined remaining charge as said remaining charge of said power storage unit, wherein

said no-load state generation unit creates the no-load state of said power storage unit when said remaining charge of said power storage unit is corrected by said remaining charge correction unit.

6. A control device for a hybrid vehicle according to claim 3, further comprising:

a remaining charge for correction calibration unit which calibrates said predetermined remaining charge based on said remaining charge for calibration calculated by said remaining charge for calibration calculation unit.

7. A control device for a hybrid vehicle according to claim 3, further comprising:

a standard remaining charge calibration unit which calibrates, based on said remaining charge for calibration calculated by said remaining charge for calibration calculation unit, a predetermined standard remaining charge which may be used when said remaining charge of said power storage unit is expressed as a percentage with respect to said predetermined standard remaining charge.

8. A control device for a hybrid vehicle according to claim 4, further comprising:

a standard remaining charge calibration unit which calibrates, based on said remaining charge for calibration calculated by said remaining charge for calibration calculation unit, a predetermined standard remaining charge which may be used when said remaining charge of said power storage unit is expressed as a percentage with respect to said predetermined standard remaining charge.

9. A control device for a hybrid vehicle according to claim 5, further comprising:

a standard remaining charge calibration unit which calibrates, based on said remaining charge for calibration calculated by said remaining charge for calibration calculation unit, a predetermined standard remaining charge which may be used when said remaining charge of said power storage unit is expressed as a percentage with respect to said predetermined standard remaining charge.

10. A control device for a hybrid vehicle according to claim 6, further comprising:

a standard remaining charge calibration unit which calibrates, based on said remaining charge for calibration calculated by said remaining charge for calibration calculation unit, a predetermined standard remaining charge which may be used when said remaining charge of said power storage unit is expressed as a percentage with respect to said predetermined standard remaining charge.

11. A hybrid vehicle provided with a remaining charge detection device for a power storage unit including:

a current detection unit which detects the current value of a charging current and a discharging current of a power storage unit;

a voltage detection unit which detects the voltage value of a terminal voltage of said power storage unit; and

a current accumulation remaining charge calculation means which accumulates the current value detected by said current detection unit to obtain an accumulated charging current and an accumulated discharging current and, based on said accumulated charging current and said accumulated discharging current, calculates a remaining charge of said power storage unit, said remaining charge detection device further comprising;

a no-load state detection unit which detects a no-load state of said power storage unit; and

a remaining charge for calibration calculation unit which calculates, according to the voltage value detected in the no-load state of said power storage unit, a remaining charge for calibration with respect to said remaining charge of said power storage unit.

12. A hybrid vehicle according to claim 11, wherein

said remaining charge detection device for a power storage unit further comprising:

a standard remaining charge calibration unit which calibrates, based on said remaining charge for calibration calculated by said remaining charge for calibration calculation unit, a predetermined standard remaining charge which may be used when said remaining charge of said power storage unit is expressed as a percentage with respect to said predetermined standard remaining charge.