Onboard charging control apparatus for controlling charge to secondary battery

• US 8,704,495 B2
• Filed: 01/05/2011
• Issued: 04/22/2014
• Est. Priority Date: 02/26/2010
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Sakai, Naoto
• Primary Examiner(s): Muralidar, Richard V
• Application Number:
  US12/984,765
• Publication Number:
  US 20110210698A1
• Time in Patent Office: 1,203 Days
• Field of Search: 320/137, 320/155, 320/109, 180/65.1, 180/65.21, 180/65.265, 180/65.27, 180/65.275, 180/65.29, 701/22, 702/63, 903/903, 903/907
• US Class Current: 320/155
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2260/46 by self learning
• CPC Class Codes: B60L 2260/58 Departure time prediction
• CPC Class Codes: B60L 53/11 DC charging controlled by the charging station, e.g. mode 4
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60L 53/63 in response to network capacity
• CPC Class Codes: B60L 53/64 Optimising energy costs, e.g. responding to electricity rates
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 58/16 responding to battery ageing, e.g. to the number of charging cycles or the state of health [SoH]
• CPC Class Codes: H02J 2310/48 for electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: H02J 7/0071 with a programmable schedule
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• 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 90/12 Electric charging stations
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles
• CPC Class Codes: Y02T 90/167 Systems integrating technologies related to power network operation and communication or information technologies for supporting the interoperability of electric or hybrid vehicles, i.e. smartgrids as interface for battery charging of electric vehicles [EV] or hybrid vehicles [HEV]
• CPC Class Codes: Y04S 10/126 the energy generation units being or involving electric vehicles [EV] or hybrid vehicles [HEV], i.e. power aggregation of EV or HEV, vehicle to grid arrangements [V2G]
• CPC Class Codes: Y04S 30/14 Details associated with the interoperability, e.g. vehicle recognition, authentication, identification or billing

Abstract

A vehicle has an ECU, a battery being chargeable with off-board electricity and a motor driven by electric power of the battery. The ECU has a microcomputer to receive an operation time each time a user sets the ECU in an operation state, prepare a frequency of operation times for each time zone, and set a time of the time zone corresponding to the high frequency as a charging end target time. When the microcomputer receives a signal from an onboard charger connected with an off-board power source, the microcomputer sets a charging schedule such that the battery charged by the charger according to the schedule is set in a fully-charged state at the charging end target time. The microcomputer controls the charger to charge the battery according to the schedule and to set the battery in the fully-charged state at the charging end target time.

Claims

1. An on-board charging control apparatus being suitable for charging an on-board secondary battery using an on-board charger, wherein the charger, the charging control apparatus, and the secondary battery are mounted on a vehicle having a motor driven by electric power of the secondary battery, comprising:

a present time outputting unit configured to output a time signal indicating a present time;

a charging start signal receiving unit configured to receive a charging start signal outputted from the charger when off-board electricity is supplied to the charger and then charging of the secondary batter b the charger starts;

an operation signal receiving unit configured to receive an operation signal indicating that an operation state setting switch for supplying of the secondary battery'"'"'s power to each of running system ECUs and ignition system ECUs has been turned ON;

a charging end target time setting unit configured to receive the time signal from the present time outputting unit in response to the reception of the operation signal in the operation signal receiving unit, and set a charging end target time based on the present time of the received time signal; and

a charging control unit configured to receive the time signal from the present time outputting unit in response to the reception of the charging start signal in the charging start signal receiving unit, set a charging schedule, based on the charging end target time and the present time being indicated by the time signal received in response to the reception of the charging start signal, such that the secondary battery can be charged by the charger according to the charging schedule until the charging end target time, produce a charging control signal according to the charging schedule, and output the charging control signal to the charger such that the charger performs charging of the secondary battery according to the charging schedule.

2. The apparatus according to claim 1, wherein the charging end target time setting unit is configured to:

obtain the present time of the time signal as an operation time each time the operation signal receiving unit receives the operation signal and then store them as a particular operation time zone in a memory,

calculate a frequency of the operation times for each of a plurality of operation time zones based on the stored information, and

set a certain time in the operation time zone corresponding to the high frequency as the charging end target time.

3. The apparatus according to claim 2, wherein charging of the secondary battery is gradually done such that the charging of the secondary battery is completed until the charging end target time.

4. The apparatus according to claim 2, wherein charging of the secondary battery is rapidly done at an applicative degree, thereafter charging of the secondary battery is completed until the charging end target time.

5. The apparatus according to claim 1, further comprising:

a charging mode setting unit configured to set a charging mode in response to a charging mode setting signal,

wherein the charging control unit is configured to set the charging schedule, when the charging mode setting unit sets the charging mode, such that the charging of the secondary battery will be started at the time being indicated by the time signal received in response to the reception of the charging start signal.

6. The apparatus according to claim 1, wherein the charging control unit is configured to set the charging schedule such that a charging power level of the charge to the secondary battery is changed during the charge.

7. The apparatus according to claim 1, further comprising:

a first relay driving unit configured to turn on a first relay in response to the reception of the charging start signal in the charging start signal receiving unit; and

a first relay signal receiving unit configured to receive a first relay signal which is outputted from the first relay when the first relay is turned on by the first relay driving unit,

wherein the charging control unit is configured to set the charging schedule in response to one of the reception of the charging start signal in the charging start signal receiving unit and the reception of the first relay signal in the first relay receiving unit or in response to both the reception of the charging start signal in the charging start signal receiving unit and the reception of the first relay signal in the first relay receiving unit.

8. The apparatus according to claim 1, further comprising:

a second relay driving unit configured to turn on a second relay in response to the reception of the operation signal in the operation signal receiving unit; and

a second relay signal receiving unit configured to receive a second relay signal which is outputted from the second relay when the second relay is turned on by the second relay driving unit,

wherein the charging end target time setting unit is configured to set the charging end target time in response to one of the reception of the operation signal in the operation signal receiving unit and the reception of the second relay signal in the second relay signal receiving unit or in response to both the reception of the operation signal in the operation signal receiving unit and the reception of the second relay signal in the second relay signal receiving unit.

9. The apparatus according to claim 1, wherein a microcomputer is configured to act as the charging start signal receiving unit, the operation signal receiving unit, the charging end target time setting unit and the charging control unit, the operation signal receiving unit is configured to receive each of a plurality of operation signals indicating respective operation states of the vehicle, the microcomputer and the present time outputting unit are configured to receive electric power from a battery of the vehicle to be activated at any time, regardless of the operation states, the microcomputer is configured to be set in a sleep mode in response to satisfaction of a sleep condition in the vehicle so as to stop operations of the charging end target time setting unit and the charging control unit of the microcomputer, and the sleep mode in the microcomputer is released in response to the reception of one reception signal in the operation signal receiving unit or the reception of the charging start signal in the charging start signal receiving unit so as to start operations of the charging end target time setting unit and the charging control unit.

10. The apparatus according to claim 1, wherein the present time outputting unit is a real time clock.

11. The apparatus according to claim 1, wherein the vehicle on which the apparatus is mounted is any one of a plug-in hybrid vehicle being able to obtain driving force from both an engine and a motor, an electric vehicle obtaining driving force only from a motor, and a fuel battery electric vehicle.

12. The apparatus according to claim 1, wherein the operation state setting switch is a user-operable push button switch.

13. The apparatus according to claim 1, wherein the operation state setting switch is an ignition switch.

14. The apparatus according to claim 1, wherein the operation state setting switch is a mechanical key.

15. A charging method being suitable for charging an on-board secondary battery by an on-board charging control apparatus using an on-board charger, wherein the charger, the charging control apparatus, and the secondary battery are mounted on a vehicle having a motor driven by electric power of the secondary battery, comprising:

receiving an operation signal indicating that an operation state setting switch for supplying the secondary battery'"'"'s power to each of running system ECUs and ignition system ECUs has been turned ON and obtaining a time that the operation signal has been received;

setting a charging end target time based on the received time of the operation signal;

receiving a charging start signal outputted from the charger when off-board electricity is supplied to the charger, and obtaining a charging start time;

setting a charging schedule, based on the charging start time and the charging end target time, such that the secondary battery can be charged by the charger according to the charging schedule until a predetermined charging amount until the charging end target time; and

charging the secondary battery by the charger according to the charging schedule.

16. The method according to claim 15, wherein charging of the secondary battery is gradually done such that the charging of the secondary battery is completed until the charging end target time.

17. The method according to claim 15, wherein charging of the secondary battery is rapidly done at an applicative degree, thereafter charging of the secondary battery is completed until the charging end target time.