Abnormal signal perception based abnormal step size acquisition method for vehicle electrical performance data

Abstract

The invention discloses an abnormal signal perception based abnormal step size acquisition method for vehicle electrical performance data. According to vehicle electrical performance data acquisitionrequirements, acquisition point pretreatment and an acquisition time prediction mechanism are added, and vehicle electrical performance data acquisition is converted into abnormal signal perception based abnormal step size acquisition; the pretreatment mechanism of acquisition points is defined, signal deviation estimation [rho]c and abnormal estimation which is shown in the description are introduced, and an abnormal signal in the acquisition points is corrected through the sampling of the acquisition points; and a signal margin which is shown in the description is defined, a signal bias coefficient a, zero drift b and a signal skipping coefficient which is shown in the description are introduced, and a real-time acquisition time prediction mechanism is designed. Through the pretreatmenton data, the acquisition time can be predicted to prepare the next acquisition, so that the vehicle electrical performance data abnormal step size acquisition can be realized; and the method can correct abnormal points during acquisition and dynamically change sampling step sizes, so that situation of high hardware requirements for high frequency, fixed cycle and longtime acquisition can be avoided, equipment costs can be reduced, and the efficiency and reliability of vehicle electrical performance data acquisition can be enhanced.

Description

technical field [0001] The invention relates to a technology for collecting electrical performance data of a complete vehicle, in particular to an asynchronous long collection method for electrical performance data of a complete vehicle based on abnormal signal perception. Background technique [0002] With more and more electrical equipment used in vehicles, from engine control to transmission system control, from driving, braking, steering system control to safety assurance system and instrument alarm system, from power management to various functions for improving comfort With great efforts, the automotive electrical system has formed a complex large system. As a whole, the electrical system must be designed so that their work can match each other, so it is very important to test the electrical system of the whole vehicle. [0003] In the existing technology, during the acquisition process, the abnormal signal generated by the traditional electrical performance system du...

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Problems solved by technology

[0003] In the existing technology, during the acquisition process, the abnormal signals generated by the traditional electrical performance system due to surrounding interference or self-noise interference cannot be self-corrected, and the test results will have a certain impact on the reliability evaluation accuracy

Secondly, most of the electrical performance test modes are single, the data acquisition rate is low and the sampling interval cannot be adjusted adaptively. The speed of change is obviously different under different conditions. The use of regular interval sampling method may inevitably lead to sampling redundancy when the speed of change is slow, and when the speed of change is fast, it will cause relatively insufficient sampling times and miss the results of some extreme cases.

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