Residual electric quantity estimating method of electric vehicles

Abstract

The invention discloses a residual electric quantity estimating method of electric vehicles. The residual electric quantity can be obtained through a Kulun detection method, the Kulun detection method can be revised under assistance of an open-circuit voltage method under the condition that the revision condition can be met, and the Kulun detection method can be revised through the open-circuit voltage method under different using conditions according to the characteristics of the battery. The dispersion degrees of each phase of a battery core can be detected through the residual electric quantity estimating method of electric vehicles, and revision on the revision electric quantity of the battery can be performed through a self-regulation mechanism when the detection values exceed the set values. When long-time charging is performed on the battery, a revision equation of the original battery characteristics is built through a curvilinear regression method, so that the accuracy in residual electric quantity estimation can be improved.

Description

technical field [0001] The invention relates to a method for estimating battery power, in particular to a method for estimating the remaining battery power of an electric vehicle using an open-circuit voltage method to correct a Coulomb detection method. Background technique [0002] Most of the existing electric vehicles use the Coulomb detection method to estimate the residual capacity under dynamic conditions. The Coulomb detection method is also called the ampere-hour method or the integral method. The tool estimates dynamically, please cooperate Figure 5 As shown, when the battery is charging, the initial battery power is accumulated by the ampere-hour method to obtain the battery power at any charging moment, and when the battery is discharged, the initial power of the battery is also decreased by the ampere-hour method. battery with It said that based on the concept of energy balance, because the Coulomb detection method has a certain accuracy, the cumulative value...

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Problems solved by technology

[0002] Most of the existing electric vehicles use the Coulomb detection method to estimate the residual capacity under dynamic conditions. The Coulomb detection method is also called the ampere-hour method or the integral method. The tool estimates dynamically, please cooperate Figure 5 As shown, when the battery is charging, the initial battery power is accumulated by the ampere-hour method to obtain the battery power at any charging moment, and when the battery is discharged, the initial power of the battery is also decreased by the ampere-hour method. Power to It said that based on the concept of energy balance, because the Coulomb detection method has a certain accuracy, the cumulative value of the ampere-hour method during charging should be equal to the decrement value of the ampere-hour method during discharge, but the error value caused by the detection circuit component manufacturing process , measurement resolution, measurement sampling rate and other issues, so that the Coulomb detection method will produce cumulative errors during each charging and discharging process of the vehicle. As the use time increases, the cumulative error will become larger , so that the display value of the remaining battery power displayed by the vehicle is not the real remaining power of the battery, so that the user cannot correctly know the residual power stored in the vehicle, thereby causing inconvenience in use; Technical problems to be solved

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