Method and system for calculating power-off time of new energy automobile

Abstract

The invention provides a method and system for calculating power-off time of a new energy automobile. The method comprises the following steps: setting a TBOX time-effective flag bit, wherein TBOX isin a normal operation condition, the time-effective flag bit is 1, and when the TBOX is in an invalid condition, the time-effective flag bit is 0; acquiring a power-on initial time of the TBOX, and acquiring an accumulated power-on time of the TBOX before invalidation when the time-effective flag bit is changed into 0 from 1; when the TBOX time-effective flag bit is 0, starting a complete vehiclecontroller to perform timing on accumulated invalid time; according to the accumulated power-on time before invalidation and the accumulated invalid time, calculating and obtaining absolute time; andacquiring a battery operation condition of a power battery, and calculating and obtaining a power-off time of the battery according to the battery operation condition and the absolute time. The methodprovided by the invention can improve security of a battery management system and accuracy of battery state estimation.

Description

technical field [0001] The invention relates to the field of new energy vehicles, in particular to a method and system for calculating the power-off time of a new energy vehicle. Background technique [0002] As a key core parameter of new energy vehicles, power-off time is mainly used in important links such as OCV correction, SOH calculation, and battery capacity calculation in new energy battery management. Accurate power-off time calculation is an important guarantee for effective battery management. Accurate calculation of vehicle power-off time is very important. [0003] At present, the power-off time of new energy vehicles is mainly to monitor the data of the whole vehicle through the vehicle terminal TBOX and obtain the power-off time. However, when the vehicle-mounted terminal TBOX is dormant, faulty, or disconnected, it cannot obtain the vehicle power-off time, which will have a greater impact on the battery management function of new energy vehicles; In the cas...

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method and system for calculating the power-off time of new energy vehicles, which solves the problem that the current power-off time of new energy vehicles is mainly monitored and obtained through the vehicle-mounted terminal TBOX, and it is easy to obtain inaccurate power-off time when the TBOX fails, and can improve Battery Management System Safety and Accuracy of Battery State Estimation

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