Current sampling null drift processing method and method

Abstract

The invention discloses a current sampling null drift processing method and method, and the method comprises the steps: starting vehicle phase current sampling after a low voltage is applied to a vehicle every time, and collecting the current value of each phase of three-phase power; taking the current value of each phase as the acquisition null drift of the phase; processing the collected null drift to obtain an actual current null drift value; and after the vehicle is started to work, processing the collected current according to the actual current null drift value, and then obtaining a real current value for controlling the whole vehicle. The method has the advantages that the null drift value is obtained through automatic calculation according to the actual situation, so that the obtained null drift value is more suitable for corresponding disclosure, a more accurate current value is obtained, more accurate data is provided for control of the whole vehicle, and the control reliability of the whole vehicle is improved.

Description

technical field [0001] The invention relates to the field of data acquisition accuracy, in particular to a processing method and system for current sampling zero drift. Background technique [0002] The concept of zero drift (zero drift) can be described as: when the input signal of the amplifying circuit is zero (that is, there is no AC input), due to the influence of temperature changes, power supply voltage instability and other factors, the static operating point changes and is The phenomenon that the current at the output terminal of the circuit deviates from the original fixed value and drifts up and down due to step-by-step amplification and transmission is also referred to as: zero drift. In the case of severe drift, the effective signal is often "submerged", so that the amplifier circuit cannot work normally. All sensors have zero drift, which affects the measurement accuracy of the sensor. Therefore, it is necessary to find out the calculation method of zero drift...

AI Technical Summary

Problems solved by technology

In the case of severe drift, it will often make the effective signal "submerged", so that the amplifier circuit cannot work normally.

All sensors have zero drift, which affects the measurement accuracy of the sensor. Therefore, it is necessary to find out the calculation method of zero drift and the processing method of zero drift fault.

[0003] In the prior art, the processing method for zero drift in industrial applications often adopts the method of fixing the zero drift value. The calibrated zero drift value is set in the sensor or controller in advance, and then based on the preset zero drift value and the collected value. After superimposed processing, more accurate collected data can be obtained for control and use. However, although this zero-drift processing method can reduce the influence of zero-drift on the collected data to a certain extent, due to the sensor model size, working environment, temperature, etc. Various environments are different, and their zero drift must be different. Using a fixed value will limit the adaptability to a certain extent, and at the same time, the accuracy will also decrease.

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