A method and device for obtaining energy efficiency of an electric vehicle

A technology of energy efficiency and acquisition method, which is applied in the direction of measuring devices, measuring electrical variables, measuring electricity, etc., to achieve the effect of accurate acquisition

CN109471034BActive Publication Date: 2020-11-03SAIC MOTOR
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-11-03

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Abstract

The embodiment of the invention provides an acquiring method for energy efficiency of an electromobile. The acquiring method comprises the steps that charging parameters and a first weight value in the one-time charging state period, discharging parameters and a second weight value in the one-time discharging state period and a third weight value from finishing of the discharging state to beginning of a next work condition are successively obtained; the weight value is determined through standing time and an SOC changing value from the last work condition to the current work condition are determined according to the specific value between discharging energy and charging energy under the unit SOC changing value, the energy efficiency under the current weight is obtained through the discharging parameters and the charging parameters, and the current weight is the average value of the first weight value, the second weight value and the third weight value. The method can more accurately acquire the energy efficiency of the electromobile and is particularly suitable for dynamically reflecting the energy efficiency of the electromobile in real time after using of the electromobile.
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Description

technical field

[0001] The invention relates to the field of electric vehicles, in particular to a method and device for obtaining energy efficiency of electric vehicles. Background technique

[0002] With the continuous reduction of traditional energy sources and the continuous improvement of environmental awareness, new energy vehicles have been greatly developed. New energy vehicles are usually powered by batteries, and the energy efficiency of batteries can reflect the efficiency of electric vehicles.

[0003] The energy efficiency of an electric vehicle, that is, the energy efficiency of the battery, is the percentage of the battery’s discharged power and its charged power. It is usually expressed by the ratio of the battery’s full discharge to full charge. This parameter reflects the energy conversion capability of the battery. An important indicator of the power performance of new energy vehicles.

[0004] At present, the energy efficiency parameter is mainly calibra...

Examples

Embodiment Construction

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0044] refer to figure 1 As shown, it is a flow chart of the method for obtaining the energy efficiency of an electric vehicle according to an embodiment of the present invention. In this method, the charging parameters during the first charging state, the discharging parameters during the first discharging state, and the other parameters after the discharge state are completed are sequentially obtained. The weight value at the beginning of a working condition, the weight value is o...