Vehicle control device and vehicle control method

• US 9,260,104 B2
• Filed: 06/23/2010
• Issued: 02/16/2016
• Est. Priority Date: 06/23/2010
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Izumi, Junta
• Primary Examiner(s): Algahaim, Helal A
• Assistant Examiner(s): ISMAIL, MAHMOUD S
• Application Number:
  US13/806,365
• Publication Number:
  US 20130096763A1
• Time in Patent Office: 2,064 Days
• Field of Search: 307/10.7, 701/29, 701/22, 180/65.3, 320/134, 318/139
• US Class Current: 1/1
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 2240/36 Temperature of vehicle components or parts
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 3/0038 relating to sensors
• CPC Class Codes: B60L 50/61 by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00
• 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 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 20/40 Controlling the engagement or disengagement of prime movers, e.g. for transition between prime movers power-up or power-down of the driveline B60W30/192
• CPC Class Codes: B60W 2050/0075 Automatic parameter input, automatic initialising or calibrating means
• CPC Class Codes: B60W 2050/0215 Sensor drifts or sensor failures
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2510/246 Temperature
• CPC Class Codes: B60W 2555/20 Ambient conditions, e.g. wind or rain
• CPC Class Codes: B60W 2556/10 Historical data
• CPC Class Codes: B60W 50/0205 Diagnosing or detecting failures; Failure detection models
• CPC Class Codes: Y02T 10/62 : Hybrid vehicles
• 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: Y10S 903/93 : Conjoint control of different elements

Abstract

An ECU executes a program including the steps of determining a first value as a detection error when such specific conditions that a most recent IG OFF time period is equal to or longer than a predetermined time period, that motor running has continued since start of running, that a time period of running is equal to or shorter than a predetermined time period, that a square value of a current during running is equal to or smaller than a predetermined value, that a temperature at the time of start of running is within a predetermined range, and that a temperature of an atmosphere is within a predetermined range are satisfied, determining a second value as a detection error when the specific conditions are not satisfied, estimating SOC by using the determined detection error, and controlling drive based on the estimated SOC.

Claims

1. A vehicle control device mounted on a vehicle including a rotating electric machine serving as a drive source, a power storage device for supplying electric power to said rotating electric machine, and a sensor used for estimating a state of charge of said power storage device, comprising:

a computer including a non-transitory machine-readable storage medium embodied with program instructions, the computer programmed to;

detect a history of use of said vehicle for specifying a temperature of said sensor;

determine a first value as a detection error of said sensor corresponding to a predetermined range when said history of use satisfies a specific condition for specifying that a temperature of said sensor is within the predetermined range;

determine a second value greater than said first value as said detection error when said history of use does not satisfy said specific condition;

estimate a state of charge of said power storage device by using a result of detection by said sensor and any one determined detection error of said first value and said second value;

update an upper limit value and a lower limit value of the state of charge of said power storage device based on said first value when said first value is determined as said detection error; and

update an upper limit value and a lower limit value of the state of charge of said power storage device based on said second value when said second value is determined as said detection error.

2. The vehicle control device according to claim 1, wherein

said vehicle further includes an internal combustion engine as a drive source, and

the computer is further programmed to update a threshold value of the state of charge of said power storage device for actuating said internal combustion engine based on determined said detection error when said vehicle runs with said rotating electric machine while said internal combustion engine is stopped.

3. The vehicle control device according to claim 2, wherein

said sensor includes at least any one of a voltage sensor for detecting a voltage of said power storage device, a current sensor for detecting a current of said power storage device, and a temperature sensor for detecting a temperature of said power storage device.

4. The vehicle control device according to claim 2, wherein

said history of use includes a state of selection of said drive source, and

said specific condition includes such a condition that the state of selection of said drive source is a state that said vehicle has continued running with said rotating electric machine since start of running while said internal combustion engine is stopped.

5. The vehicle control device according to claim 2, wherein

said history of use includes a time period of running of said vehicle, and

said specific condition includes such a condition that the time period of running of said vehicle with said rotating electric machine while said internal combustion engine is stopped is equal to or shorter than a predetermined time period.

6. The vehicle control device according to claim 1, wherein

said power storage device includes a first power supply and a second power supply, and

the computer is further programmed to update a threshold value at which an electric power supply source is switched from said first power supply to said second power supply based on determined said detection error, while said vehicle runs with said first power supply serving as the electric power supply source for said rotating electric machine.

7. The vehicle control device according to claim 1, wherein

said history of use includes a square value of a current of said power storage device, and

said specific condition includes such a condition that the square value of the current of said power storage device is equal to or smaller than a predetermined value.

8. The vehicle control device according to claim 1, wherein

said history of use includes a time period during which said vehicle is left before most recent system start-up of said vehicle, and

said specific condition includes such a condition that said time period of being left is equal to or longer than a predetermined time period.

9. The vehicle control device according to claim 1, wherein

said history of use includes a temperature of said power storage device, and

said specific condition includes such a condition that the temperature of said power storage device at a time point of start of running of said vehicle is within a predetermined range.

10. The vehicle control device according to claim 1, wherein

said history of use includes a temperature of an atmosphere around said power storage device, and

said specific condition includes such a condition that the temperature of the atmosphere around said power storage device is within a predetermined range.

11. The vehicle control device according to claim 1, wherein

said vehicle further includes an internal combustion engine as a drive source,

said history of use includes a state of selection of said drive source, a time period of running of said vehicle, a square value of a current of said power storage device, a time period during which said vehicle is left before most recent system start-up of said vehicle, a temperature of said power storage device, and a temperature of an atmosphere around said power storage device, and

said specific condition includes such a condition that the state of selection of said drive source is a state that said vehicle has continued running with said rotating electric machine since start of running while said internal combustion engine is stopped, such a condition that the time period of running of said vehicle with said rotating electric machine while said internal combustion engine is stopped is equal to or shorter than a predetermined time period, such a condition that the square value of the current of said power storage device is equal to or smaller than a predetermined value, such a condition that said time period of being left is equal to or longer than a predetermined time period, such a condition that the temperature of said power storage device at a time point of start of running of said vehicle is within a predetermined range, and such a condition that the temperature of the atmosphere around said power storage device is within a predetermined range.

12. A vehicle control method for a vehicle including a rotating electric machine serving as a drive source, a power storage device for supplying electric power to said rotating electric machine, a sensor used for estimating a state of charge of said power storage device, and an electronic control unit including a non-transitory machine-readable storage medium embodied with program instructions for causing a computer to execute a method comprising the steps of:

detecting history of use of said vehicle for specifying a temperature of said sensor;

determining a first value as a detection error of said sensor corresponding to a predetermined range when said history of use satisfies a specific condition for specifying that a temperature of said sensor is within the predetermined range;

determining a second value greater than said first value as said detection error when said history of use does not satisfy said specific condition;

estimating a state of charge of said power storage device by using a result of detection by said sensor and any one determined detection error of said first value and said second value;

updating an upper limit value and a lower limit value of the state of charge of said power storage device based on said first value when said first value is determined as said detection error; and

updating an upper limit value and a lower limit value of the state of charge of said power storage device based on said second value when said second value is determined as said detection error.