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

Patent metadata

Field	Value
Publication number	US-10099557-B2
Application number	US-201514925004-A
Country	US
Kind code	B2
Filing date	Oct 28, 2015
Priority date	Nov 6, 2014
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

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 programmed to control charging and discharging of the secondary battery,
wherein the controlling portion is programmed to estimate the regenerative electric power that the vehicle obtains, and estimate 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 is programmed to perform charging and discharging on the secondary battery based on the virtual power storage amount, and
wherein the controlling portion is programmed to vary an upper limit and a lower limit of the virtual power storage amount such that a width between the upper limit and the lower limit of the virtual power storage amount is not changed.

2. The vehicle according to claim 1 , further comprising a power generation portion that is able to supply the electric power to the motor and the secondary battery,
wherein the controlling portion is programmed to perform charging on the secondary battery by use of the power generation portion, and perform a control on respective electric powers to be supplied to the motor from the secondary battery and the power generation portion.

3. The vehicle according to claim 1 , wherein the controlling portion is programmed to perform charging and discharging on the secondary battery so that the virtual power storage amount is between the upper limit and the lower limit of the virtual power storage amount.

4. The vehicle according to claim 1 , wherein the controlling portion is further programmed to determine 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,
wherein the predetermined upper limit is a value to restrain an excessive state of charge decrease and deterioration of the secondary battery due to a deviation between the expected power-storage increasing amount and the actual increasing amount of the power storage amount which is obtained by subsequent braking of the vehicle, and
wherein when the expected power-storage increasing amount thus estimated is larger than the predetermined upper limit of the expected power-storage increasing amount, the controlling portion is programmed to calculate the virtual power storage amount from a sum total of the predetermined upper limit and the actual power storage amount.

5. The vehicle according to claim 1 , the vehicle comprising:
a velocity detecting portion configured to detect velocity of the vehicle;
a temperature detecting portion configured to detect temperature of the secondary battery; and
a controlling portion programmed to control charging and discharging of the secondary battery,
wherein the controlling portion is programmed to:
estimate, using the detected velocity, electric power obtained at the time when kinetic energy of the vehicle which corresponds to the detected velocity is regenerated by the power regeneration portion, as regenerative electric power that the vehicle obtains; and
estimate, using a formula including a charge limitation rate to deal with a charge ability of the secondary battery that changes depending on the detected temperature, the expected power-storage increasing amount corresponding to the increasing amount of the power storage amount at the time when the estimated regenerative electric power is supplied to the secondary battery.

6. The vehicle according to claim 5 , wherein the formula is defined as:
Δ C SOC =0.5* W ve *( V ve ) 2 *E rc *E tr *E ch *U co *W in ,

wherein ΔC SOC is the expected power-storage increasing amount, W ve is a weight of the vehicle, V ve is the detected velocity, E rc *E tr *E ch is an efficiency of converting the kinetic energy into the regenerative electric power, U co is an efficiency of converting the regenerative electric power into a power storage amount of the second battery, and W in is the charge limitation rate to deal with charge ability of the second battery that changes depending on the detected temperature.

7. 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 estimated regenerative electric power 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;
performing charging and discharging on the secondary battery based on the virtual power storage amount; and
varying an upper limit and a lower limit of the virtual power storage amount such that a width between the upper limit and the lower limit of the virtual power storage amount is not changed.

8. The control method according to claim 7 , the control method further comprising:
determining 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
calculating the virtual power storage amount from a sum total of the upper limit of the expected power-storage increasing amount and an actual power storage amount of the second battery, when the expected power-storage increasing amount thus estimated is larger than the predetermined upper limit of the expected power-storage increasing amount, and
wherein the predetermined upper limit of the expected power-storage increasing amount is a value to restrain an excessive state of charge decrease and deterioration of the secondary battery due to a deviation between the expected power-storage increasing amount and the actual increasing amount of the power storage amount which is obtained by subsequent braking of the vehicle.

9. The control method according to claim 7 , the control method comprising:
detecting velocity of the vehicle;
estimating, using the detected velocity, electric power obtained at a time when kinetic energy of the vehicle which corresponds to the detected velocity is regenerated, as regenerative electric power that the vehicle obtains;
detecting temperature of the secondary battery; and
estimating, using a formula including a charge limitation rate to deal with a charge ability of the secondary battery that changes depending on the detected temperature, the expected power-storage increasing amount corresponding to the increasing amount of the power storage amount at the time when the estimated regenerative electric power is supplied to the secondary battery.

10. The control method according to claim 9 , wherein the formula is defined as:
Δ C SOC =0.5* W ve *( V ve ) 2 *E rc *E tr *E ch *U co *W in ,

wherein ΔC SOC is the expected

Assignees

• Toyota Motor Co Ltd

Inventors

• Matsubara Yasuo
• Umayahara Kenji

Classifications

• B60L1/00 Primary

  Supplying electric power to auxiliary equipment of vehicles (circuit arrangements for charging batteries H02J7/00) · CPC title

• B60L2260/44

  by parameter estimation · CPC title

• B60L2240/54

  related to batteries · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• B60L7/18

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