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Estimation for accumulator loading state of electric vehicle and carrying out method thereof

A state of charge and implementation method technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of increasing error, large error, battery model accuracy and high computing power requirements, and achieve error solving and strong Adaptiveness, the effect of improving the accuracy of the initial estimate

Inactive Publication Date: 2005-03-30
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

However, there are three main problems in the application: (1) Inaccurate current measurement will increase the error, and the long-term accumulated error will become larger and larger; (2) The loss of current charging and discharging must be considered; (3) In the high temperature state and current In the case of large fluctuations, the error is large
Since Kalman filtering involves a large number of matrix operations, the disadvantage of this method is that it requires high accuracy and computing power for the battery model. The most important thing is the impact of battery self-discharge. Simply using this method does not effectively solve the problem, but reconstructs it. self-discharge model to estimate

Method used

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  • Estimation for accumulator loading state of electric vehicle and carrying out method thereof
  • Estimation for accumulator loading state of electric vehicle and carrying out method thereof
  • Estimation for accumulator loading state of electric vehicle and carrying out method thereof

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Embodiment Construction

[0050] The specific embodiment of the present invention will be described with reference to the accompanying drawings.

[0051] Before implementing the SOC estimation algorithm, the relevant parameters of the battery model should be determined, and the method can be determined according to the pulse power test in the well-known new generation vehicle partnership project test manual (PNGV).

[0052] The state of charge equation of the battery: let x k =SOC k

[0053]

[0054] Battery load voltage measurement equation:

[0055] y(k)=f(I k , x k )+v k =k 0 -RI k -K 1 / x k -K 2 x k +K 3 ln(x k )+K 4 ln(1-x k )+v k

[0056] In this example according to figure 2 The current of 80Ah Ni-MH battery pack for cycle charge and discharge test. image 3 It is the load voltage V(t) collected during the cycle charge and discharge test. use figure 2 and image 3 The unknown parameter in the load voltage measurement equation of the battery can be determined by usi...

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Abstract

The invention relates to an estimation and implement method of state of charge (SOC) of battery for electric car, belonging to the field of electric car intelligent niformation processing technology. Said method utilizes the state space equation of battery which is formed from battery charge state equation based on ampere-hour metering method and measurement equation of battery load votlage, and uses the improved extended Kalman filtering equation to calculate and obtain the stale of charge of battery. Said invented advantage lies in that it has stronger adaptability, can eliminate initial error of SOC, and can raise the convergence of error or reduce speed, at the same time it can modify the change of SOC resulted frmo self-discharge of battery. Said invention is applicable to SOC estimation of cell monomer, module and battery.

Description

technical field [0001] The invention relates to an estimation and realization method of the state of charge (SOC) of a storage battery for an electric vehicle, and belongs to the technical field of intelligent information processing of electric vehicles. Background technique [0002] With the growing awareness of environmental protection, more and more people in the automotive field are turning their attention to zero-emission electric vehicles. As the main or auxiliary power source of electric vehicles, batteries are a key component of electric vehicles. How to use the battery rationally, make full use of the energy in the battery, and prolong the service life of the battery is a problem that must be solved in the further development of electric vehicles and hybrid vehicles. SOC estimation is to electric vehicles what a fuel gauge is to internal combustion engine vehicles. Different from the fuel tank of an internal combustion engine vehicle, the power supply capability o...

Claims

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Application Information

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IPC IPC(8): G01R31/36
Inventor 王军平林成涛陈全世韩晓东
Owner TSINGHUA UNIV
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