State detecting system and device employing the same

• US 7,406,389 B2
• Filed: 06/22/2006
• Issued: 07/29/2008
• Est. Priority Date: 04/10/2002
• Status: Expired due to Term

• Current Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd., Shin-Kobe Electric Machinery Company Limited (Resonac Holdings Corp.)
• Inventors: Mitsui, Toshisada, Hombu, Mitsuyuki, Kudou, Akihiko, Yoshihara, Shigeyuki, Emori, Akihiko, Miyazaki, Hideki, Sasazawa, Kazuyoshi
• Primary Examiner(s): Assouad; Patrick
• Assistant Examiner(s): SUAREZ, FELIX E
• Application Number:
  US11/472,272
• Publication Number:
  US 20060247871A1
• Time in Patent Office: 768 Days
• Field of Search: 702/60, 702 63- 65, 702/85, 702/99, 702/123, 702/182, 702/183, 320/132, 324/427, 340/870.02
• US Class Current: 702/85
• CPC Class Codes: B60L 2210/40 DC to AC converters
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 2240/547 Voltage
• CPC Class Codes: B60L 2240/549 Current
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 50/40 using propulsion power supplied by capacitors
• CPC Class Codes: B60L 50/51 characterised by AC-motors
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 8/003 Converting light into electric energy, e.g. by using photo-voltaic systems
• 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 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/367 Software therefor, e.g. for battery testing using modelling or look-up tables
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements
• CPC Class Codes: G01R 31/389 Measuring internal impedance, internal conductance or related variables
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 : Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 : Electric energy management in electromobility
• CPC Class Codes: Y02T 90/16 : Information or communication technologies improving the operation of electric vehicles

Abstract

A state detecting system which can detect state of power storage at high precision even with lesser characteristic data to be used for calculation, and a device employing the same. The state detecting system has a memory for storing a characteristic data, calculation information, and set information, an arithmetic unit for calculating state information indicative of state of said power storage and calculating correction information for performing correction, a first correcting unit for correcting input of said arithmetic means, and a second correcting unit for correcting information stored or set in the storage.

Claims

1. A system for detecting a state of an electric storage device comprising:

a memory, wherein said memory stores storage information including characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

a calculator, wherein said calculator determines state information based on input information including measurement data from a measurement instrument and said storage information, and wherein said calculator provides correction data corresponding to said input information when said state information differs from said set data; and

a correction unit, wherein said correction unit changes said input information based on said correction data;

wherein said input information includes internal resistance information of said storage device, and wherein said correction data includes internal resistance correction data corresponding to said internal resistance information, and

wherein said correction unit rewrites said internal resistance information in said memory on the basis of said internal resistance correction data.

2. A system for detecting a state of an electric storage device comprising:

a memory, wherein said memory stores storage information including characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

a calculator, wherein said calculator determines state information based on input information including measurement data from a measurement instrument and said storage information, and wherein said calculator provides correction data corresponding to said input information when said state information differs from said set data; and

a correction unit, wherein said correction unit changes said input information based on said correction data;

wherein said input information includes internal resistance information of said storage device, and wherein said correction data includes internal resistance correction data corresponding to said internal resistance information, and

wherein said input information further includes polarized voltage information of said storage device, and wherein said correction data includes said polarized voltage correction data corresponding to said polarized voltage information.

3. A system for detecting a state of an electric storage device comprising:

a memory, wherein said memory stores storage information including characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

a calculator, wherein said calculator determines state information based on input information including measurement data from a measurement instrument and said storage information, and wherein said calculator provides correction data corresponding to said input information when said state information differs from said set data; and

a correction unit, wherein said correction unit changes said input information based on said correction data;

wherein said input information includes internal resistance information of said storage device, and wherein said correction data includes internal resistance correction data corresponding to said internal resistance information, and

wherein said input information further includes capacity information of said storage device, wherein said calculator provides said correction data as a result of at least two different calculations, and wherein said correction data includes said capacity correction data corresponding to said capacity information.

4. The system of claim 3, wherein said input information further includes polarized voltage information of said storage device, and wherein said correction data includes said polarized voltage correction data corresponding to said polarized voltage information.

5. A system for detecting a state of an electric storage device comprising:

a memory, wherein said memory stores storage information including characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

a calculator, wherein said calculator determines state information based on input information including measurement data from a measurement instrument and said storage information, and wherein said calculator provides correction data corresponding to said input information when said state information differs from said set data; and

a correction unit, wherein said correction unit changes said input information based on said correction data;

wherein said input information includes internal resistance information of said storage device, and wherein said correction data includes internal resistance correction data corresponding to said internal resistance information, and

wherein said storage device comprises a lithium battery.

6. A power supplying system comprising:

an electric storage device;

a state detection system for determining a state of said electric storage device; and

a measuring instrument for determining a parameter of said electric storage device and providing said parameter to said state detection system;

wherein said state detection system comprises

a memory, wherein said memory stores storage information including characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

a calculator, wherein said calculator determines state information based on input information including measurement data from a measurement instrument and said storage information, and wherein said calculator provides correction data corresponding to said input information when said state information differs from said set data, and wherein said input information includes internal resistance information of said storage device; and

a correction unit, wherein said correction unit changes said input information based on said correction data.

7. The system of claim 6, wherein said electric storage device comprises a lithium battery.

8. A power storage apparatus comprising:

a control converter to which a commercial power source, a photovoltaic generation device, and a load device are connected through a plurality of switches;

a controller, wherein said controller operates said plurality of switches and said control converter;

an electric storage device connected to said control converter;

a state detecting system for determining a state of said electric storage device;

a measuring instrument for determining a parameter of said electric storage device and providing said parameter to said state detection system;

wherein said control converter determines power flow between said electric storage device and each of said commercial power source, said photovoltaic generation device, and said load device,

wherein said state detecting system and said controller are in communication with one another,

wherein said controller operates based on information from said state detecting system, and

wherein said state detection system comprises

a memory, wherein said memory stores storage information including characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

a calculator, wherein said calculator determines state information based on input information including measurement data from a measurement instrument and said storage information, and wherein said calculator provides correction data corresponding to said input information when said state information differs from said set data, and wherein said input information includes internal resistance information of said storage device; and

a correction unit, wherein said correction unit changes said input information based on said correction data.

9. An apparatus for an electric vehicle comprising:

a control converter connected to a motor;

a controller, wherein said controller operates said control converter;

an electric storage device connected to said control converter;

a state detecting system for determining a state of said electric storage device; and

a measuring instrument for determining a parameter of said electric storage device and providing said parameter to said state detection system;

wherein said control converter determines power flow between said electric storage device and said motor,

wherein said state detecting system and said controller are in communication with one another,

wherein said controller operates based on information from said state detecting system, and

wherein said state detection system comprises

a memory, wherein said memory stores storage information including characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

a calculator, wherein said calculator determines state information based on input information including measurement data from a measurement instrument and said storage information, and wherein said calculator provides correction data corresponding to said input information when said state information differs from said set data, and wherein said input information includes internal resistance information of said storage device; and

a correction unit, wherein said correction unit changes said input information based on said correction data.

10. The apparatus of claim 9, wherein said electric storage device comprises a lithium battery.

11. An apparatus for a hybrid vehicle comprising:

a motor including a driving source for a wheel in combination with an internal combustion engine;

a control converter connected to said motor;

a controller, wherein said controller operates said control converter;

an electric storage device connected to said control converter;

a state detecting system for determining a state of said electric storage device; and

a measuring instrument for determining a parameter of said electric storage device and providing said parameter to said state detection system;

wherein said control converter determines power flow between said electric storage device and said motor,

wherein said state detecting system and said controller are in communication with one another,

wherein said controller operates based on information from said state detecting system, and

wherein said state detection system comprises

a memory, wherein said memory stores storage information including characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

a calculator, wherein said calculator determines state information based on input information including measurement data from a measurement instrument and said storage information, and wherein said calculator provides correction data corresponding to said input information when said state information differs from said set data, and wherein said input information includes internal resistance information of said storage device; and

a correction unit, wherein said correction unit changes said input information based on said correction data.

12. The apparatus of claim 11, wherein said electric storage device comprises a lithium battery.

13. An apparatus for a hybrid vehicle comprising:

means for driving a wheel;

converter means connected to said driving means;

control means for controlling said converter means;

electric storage means connected to said converter means;

state detection means for detecting a state of said electric storage means; and

measuring means for measuring a parameter of said electric storage means and for providing said parameter to said state detection means;

wherein said converter means determines power flow between said electric storage means and said driving means,

wherein said state means and said control means are in communication with one another,

wherein said control means operates based on information from said state detection means, and

wherein said state detection means comprises

memory means for storing storage information including characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

calculation means for determining state information based on input information including measurement data from a measurement instrument and said storage information, and wherein said calculation means provides correction data corresponding to said input information when said state information differs from said set data, and wherein said input information includes internal resistance information of said storage device; and

a correction means for changing said input information based on said correction data.

14. A method for detecting a state of an electric storage device comprising:

storing storage information in a memory, wherein said storage information includes characteristic data of said storage device, calculation data required for detecting said state, and set data based on a property of said storage device or a phenomenon caused therein;

determining state information with a calculator based on input information including measurement data from a measurement instrument and said storage information;

providing correction data with said calculator corresponding to said input information when said state information differs from said set data; and

changing said input information based on said correction data with a correction unit;

wherein said correction data includes internal resistance correction data corresponding to internal resistance information of said storage device.

15. A state detecting system for an electric storage device comprising:

a memory medium storing storage information which includes characteristic data of an electric storage device, calculation information required for calculation for detection of a state of the electric storage device, and set information on a true set value or true logic based on a characteristic of the electric storage device or a phenomenon caused therein;

a calculator which performs the calculation for detection of the state of the electric storage device on the basis of measured information obtained from a measuring instrument for measuring a parameter of the electric storage device required for detection of the state thereof and input information including the storage information, judges whether or not a discrepancy exists in state detection information obtained by the calculation in comparison with the state detection information and the set information, and outputs correction information corresponding to the input information when the discrepancy exists as a result of the judgment; and

a corrector for correcting the input information on the basis of the correction information;

wherein

the correction information includes internal resistance information of the power storage device,

the calculator outputs correction information corresponding to at least the internal resistance information when the discrepancy is found, and

the corrector corrects the internal resistance information on the basis of the correction information corresponding thereto.

16. A state detecting system for an electric storage device according to claim 15, wherein the calculator judges a discrepancy to be caused and outputs the correction information corresponding to the internal resistance, when detection information of overcharging or overdischarging is obtained in a state where a charging or discharging current in the power storage device is an allowable charging or discharging current or less.