CHARGE CONTROL SYSTEM

• US 20130069599A1
• Filed: 06/11/2010
• Published: 03/21/2013
• Est. Priority Date: 06/11/2010
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Kimura, Masaru
• Granted Patent: US 8,704,496 B2
• Time in Patent Office: Days
• 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 which can be charged by using electric power supplied from an external commercial power source;

a voltage detection section which detects a voltage across the electric power storage device;

a variation suppression coefficient setting section which sets a variation suppression coefficient for operationally suppressing an effect of a variation of the electric power from the external commercial power source on the voltage across the electric power storage device;

a variation suppression operation processing section which operates a charged state estimation operation value of the electric power storage device by using the voltage across the electric power storage device which is detected by the voltage detection section, the variation suppression coefficient which is set by the variation suppression coefficient setting section, and the charged state estimation operation value which is obtained by a previous operation; and

a charged state estimation section which estimates a charged state of the electric power storage device based on the charged state estimation operation value,

wherein

when the charged state estimation operation value drops within a predetermined period during charging of the electric power storage device, the variation suppression coefficient setting section changes the variation suppression coefficient such that, when operating the charged state estimation operation value after the predetermined period, of the voltage across the electric power storage device which is detected by the voltage detection section and the 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.

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

providing that the voltage across the electric power storage device which is detected by the voltage detection section is V, the variation suppression coefficient is t, the charged state estimation operation value which is obtained by the previous operation is Vf_L, and the charged state estimation operation value to be obtained by a current operation is Vf,

the variation suppression operation section obtains Vf by using Vf=(1−

t)*Vf_L+t*V, and

the variation suppression coefficient setting section changes a value of the variation suppression coefficient t to a smaller value based on a coefficient changing reference value which is calculated when the charged state estimation operation value Vf drops within a predetermined period during charging of the electric power storage device.

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

when the number of times the charged state estimation operation value Vf drops within the predetermined period is x, the variation suppression coefficient setting section obtains, as the coefficient changing reference value, a drop average value obtained by dividing a sum of drop amounts of the charged state estimation operation value Vf within the predetermined period by x.

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

when the number of times the charged state estimation operation value Vf drops within the predetermined period is x, the variation suppression coefficient setting section sets x as the coefficient changing reference value.