Unlock instant, AI-driven research and patent intelligence for your innovation.

Adaptive slowly-varying current detection

A technology of current and current change, which is applied in the direction of circuits, measuring electronics, measuring devices, etc., and can solve the problems of inaccurate current sensors and increased errors

Inactive Publication Date: 2012-05-16
GM GLOBAL TECH OPERATIONS LLC
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally not desirable to use Coulomb integration to determine battery SOC exclusively, as it must have an accurate history of the battery current used for integration, and the current sensors used to measure battery current, typically in automotive applications, are not accurate enough
Thus, without knowing the initial current point, errors are introduced into the calculations and increase over time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Adaptive slowly-varying current detection
  • Adaptive slowly-varying current detection
  • Adaptive slowly-varying current detection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0061] The following discussion of embodiments of the present invention relating to systems and methods for determining whether an RLS algorithm can be effectively used to estimate battery SOC is merely exemplary in nature and in no way intended to limit the invention, its application, or use. For example, the invention is particularly applicable to managing vehicle batteries. However, as would be appreciated by those skilled in the art, the techniques disclosed herein will have other applications and are not limited to vehicular applications.

[0062] figure 1 is a simplified plan view of a vehicle 10 including a high voltage battery 12 and a primary power source 14 , where the vehicle 10 is intended to represent any hybrid vehicle—eg, a hybrid internal combustion engine vehicle, a fuel cell system vehicle, or the like. Battery 12 may be any battery suitable for a hybrid vehicle - such as lead-acid batteries, metal hydride batteries, lithium-ion batteries, and the like. Ve...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A system and method for determining whether an onboard estimation process, such as a recursive least squares regression process, can effectively calculate the state-of-charge of a battery. The method includes defining a current sample time and a previous sample time and measuring the battery current. The method then calculates a variation moving average of the measured current and an index of current change rate determined by averaging the absolute value of the current variation moving average using the measured current and calculated moving averages from the previous sample time. The method then determines if the current change index is greater than a predetermined threshold, and if so, the estimate of the battery state-of-charge resulting from the onboard estimation process is valid.

Description

technical field [0001] The present invention relates generally to a system and method for estimating the state of charge (SOC) of a battery, and more particularly to a system and method for estimating the SOC of a battery, the method including calculating a current change index to determine whether the battery current Sufficient excitation is included so that on-board real-time estimation algorithms such as recursive least squares (RLS) regression algorithms can provide accurate estimates of SOC. Background technique [0002] Electric vehicles are becoming more and more popular. These vehicles include hybrid vehicles - such as extended-range electric vehicles (EREV) as well as pure electric vehicles - such as battery electric vehicles (BEV), which combine batteries with primary power sources - such as internal combustion engines, fuel cells systems etc. All of these types of electric vehicles employ high voltage batteries comprising multiple battery cells. These batteries...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36
CPCY02E60/12H01M10/48G01R31/3613G01R31/3832Y02E60/10
Inventor J.林X.唐B.J.科赫
Owner GM GLOBAL TECH OPERATIONS LLC