Charge control system

• US 8,704,496 B2
• Filed: 06/11/2010
• Issued: 04/22/2014
• Est. Priority Date: 06/11/2010
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Kimura, Masaru
• Primary Examiner(s): Muralidar, Richard V
• Assistant Examiner(s): Henze-Gongola, David
• Application Number:
  US13/143,483
• Publication Number:
  US 20130069599A1
• Time in Patent Office: 1,411 Days
• Field of Search: 320/132, 320157-159, 320162-164, 180/65.29, 702/63
• US Class Current: 320/162
• CPC Class Codes: B60L 53/62 in response to charging parameters, e.g. current, voltage or electrical charge
• CPC Class Codes: G01R 31/3835 involving only voltage measurements
• CPC Class Codes: H02J 7/04 Regulation of charging current or voltage
• 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 90/16 Information or communication technologies improving the operation of electric vehicles

Abstract

A charge control system (10) includes an electric power storage device (102), a variation suppression coefficient setting section (214) which sets a variation suppression coefficient, a variation suppression operation processing section which operates a charged state estimation operation value, and a charged state estimation section which estimates a charged state of the electric power storage device. The variation suppression coefficient setting section (214), when the charged state estimation operation value drops within a predetermined period during charging of the electric power storage device (102), changes the variation suppression coefficient such that, of the voltage across the electric power storage device detected by a voltage sensor (105) and a charged state estimation operation value which is obtained by the previous operation, a ratio of the voltage across the electric power storage device which is detected by the voltage detection section is smaller, for operating the charged state estimation operation value after the predetermined period.

Claims

1. A charge control system, comprising:

an electric power storage device configured to be charged by using alternating current electric power supplied from an external commercial power source;

a voltage detection section configured to detect a voltage V across the electric power storage device;

a charged state estimation value setting section configured to set a charged state estimation value Vf based on the voltage V across the electric power storage device; and

a charged state estimation section configured to estimate a charged state of the electric power storage device based on the charged state estimation value Vf, wherein

the charged state estimation value setting section includes;

an initial state setting section which divides a charging period of the electric power storage device into a first half charging period, which is set as a predetermined period from beginning of charging, and a second half charging period subsequent to the first half charging period, and sets a charged state estimation value Vf for the first half charging period as a value VfL of an initial state;

a variation suppression coefficient setting section which sets a variation suppression coefficient t to be a smaller value in response to;

(1) an amount of a voltage drop, which temporarily occurs in response to a variation in power supplied from the external commercial power source, or (2) a number of voltage drops, based on rising characteristics of the voltage V across the electric power storage device that rises with charging when there is no variation in power supplied from the external commercial power source in the first half charging period, the variation suppression coefficient having a value that is not equal to zero or one; and

a variation suppression section which sets a charged state estimation value Vf for the second half charging period using Vf=(1−

t)*VfL+t*V, using the variation suppression coefficient t which is set by the variation suppression coefficient setting section.

2. The charge control system according to claim 1, wherein

when the number of times the voltage drops within the first half charging period is x, the variation suppression coefficient setting section sets the variation suppression coefficient t based on a voltage drop average value obtained by dividing a sum of voltage drop amounts within the first half charging period x.

3. The charge control system according to claim 1, wherein

when the number of times the voltage drops within the first half charging period is x, the variation suppression coefficient setting section sets the variation suppression coefficient t based on x.