Vehicle driven by motor and control method of charging and discharging of secondary battery provided in vehicle

Patent metadata

Field	Value
Publication number	US-2016129804-A1
Application number	US-201514925004-A
Country	US
Kind code	A1
Filing date	Oct 28, 2015
Priority date	Nov 6, 2014
Publication date	May 12, 2016
Grant date	—

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.

First claim

What is claimed is:

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.

Assignees

• Toyota Motor Co Ltd

Inventors

• Matsubara Yasuo
• Umayahara Kenji

Classifications

• B60L7/10

  Dynamic electric regenerative braking (B60L7/22 takes precedence) · CPC title

• B60L15/2009

  for braking · CPC title

• B60L7/18

  Controlling the braking effect (B60L7/12, B60L7/14, B60L7/16 take precedence) · CPC title

• B60L2240/54

  related to batteries · CPC title

• B60L2240/12

  Speed · CPC title