VEHICLE DRIVEN BY MOTOR AND CONTROL METHOD OF CHARGING AND DISCHARGING OF SECONDARY BATTERY PROVIDED IN VEHICLE

• US 20160129804A1
• Filed: 10/28/2015
• Published: 05/12/2016
• Est. Priority Date: 11/06/2014
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: MATSUBARA, Yasuo, UMAYAHARA, Kenji
• Granted Patent: US 10,099,557 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 1/00 Supplying electric power to auxiliary equipment of vehicles circuit arrangements for charging batteries H02J7/00
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/54 related to batteries
• CPC Class Codes: B60L 2260/44 by parameter estimation
• CPC Class Codes: B60L 58/13 Maintaining the SoC within a determined range
• CPC Class Codes: B60L 58/40 for controlling a combination of batteries and fuel cells
• CPC Class Codes: B60L 7/18 Controlling the braking effect B60L7/12, B60L7/14, B60L7/16 take precedence
• CPC Class Codes: Y02E 60/10 Energy storage using batteries
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 10/92 Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
• CPC Class Codes: Y02T 90/40 Application of hydrogen technology to transportation, e.g. using fuel cells

Abstract

A vehicle driven by a motor includes: a secondary battery configured to supply an electric power to the motor; a power regeneration portion configured to supply, to the secondary battery, a regenerative electric power that is recovered at a time of braking the vehicle; a power storage amount detecting portion configured to detect a power storage amount of the secondary battery; and a controlling portion configured to control charging and discharging of the secondary battery. The controlling portion estimates a regenerative electric power, and estimates an expected power-storage increasing amount, so as to calculate a virtual power storage amount from a sum total of the expected power-storage increasing amount and an actual power storage amount. The controlling portion performs charging and discharging on the secondary battery based on the virtual power storage amount.

Claims

1. A vehicle driven by a motor, the vehicle comprising:

a secondary battery configured to supply an electric power to the motor;

a power regeneration portion configured to supply, to the secondary battery, a regenerative electric power that is recovered at a time of braking the vehicle;

a power storage amount detecting portion configured to detect an actual power storage amount of the secondary battery; and

a controlling portion configured to control charging and discharging of the secondary battery,

wherein the controlling portion estimates a regenerative electric power that the vehicle obtains, and estimates an expected power-storage increasing amount corresponding to an increasing amount of the power storage amount at a time when the regenerative electric power thus estimated is supplied to the secondary battery, so as to calculate a virtual power storage amount from a sum total of the expected power-storage increasing amount thus estimated and the actual power storage amount detected by the power storage amount detecting portion, and the controlling portion performs charging and discharging on the secondary battery based on the virtual power storage amount.

2. The vehicle according to claim 1, wherein:

the controlling portion determines whether or not the expected power-storage increasing amount thus estimated is larger than a predetermined upper limit of the expected power-storage increasing amount; and

when the expected power-storage increasing amount thus estimated is larger than the upper limit of the expected power-storage increasing amount, the controlling portion calculates the virtual power storage amount from a sum total of the upper limit of the expected power-storage increasing amount and the actual power storage amount.

3. The vehicle according to claim 1, further comprising a power generation portion that is able to supply an electric power to the motor and the secondary battery,

wherein the controlling portion performs charging on the secondary battery by use of the power generation portion, and performs a control on respective electric powers to be supplied to the motor from the secondary battery and the power generation portion.

4. The vehicle according to claim 1, further comprising a velocity detecting portion configured to detect a velocity of the vehicle,

wherein the controlling portion estimates, as the regenerative electric power that the vehicle obtains, an electric power obtained at the time when that kinetic energy of the vehicle which corresponds to the velocity is regenerated by the power regeneration portion, by use of that velocity of the vehicle which is detected by the velocity detecting portion, and

the controlling portion performs charging and discharging on the secondary battery so that the virtual power storage amount is between a predetermined upper limit and a predetermined lower limit of the virtual power storage amount.

5. A control method of charging and discharging of a secondary battery provided in a vehicle, the control method comprising:

detecting an actual power storage amount of the secondary battery;

estimating a regenerative electric power that the vehicle obtains;

estimating an expected power-storage increasing amount corresponding to an increasing amount of the power storage amount at a time when the regenerative electric power thus estimated is supplied to the secondary battery;

calculating a virtual power storage amount from a sum total of the actual power storage amount thus detected and the expected power-storage increasing amount thus estimated; and

performing charging and discharging on the secondary battery based on the virtual power storage amount.