Current measuring method and arrangement

Abstract

The invention relates to a method and device for detecting a current. In the method for detecting a current, the current is detected by a first current sensor in a predetermined sampling period as a digital value, and is detected by a second current sensor in a period longer than the first current sensor with high accuracy as a digital value. In the method for detecting a current, the current during detecting-incapable time period, which is incapable of detecting the current during detecting timing for detecting the current during the predetermined period by the second current sensor, is complemented with the current value detected by the first current sensor.

Description

technical field [0001] The invention relates to a method and device for accurately detecting current, in particular to an optimal current detection method and device for accurately detecting the current of a rechargeable battery mounted on a hybrid vehicle. Background technique [0002] In electric vehicles such as hybrid vehicles, the residual charge of the rechargeable battery that drives the driving motor is calculated by accumulating the charge and discharge current. At this time, accurately detecting the current is extremely important for accurately calculating the remaining power of the rechargeable battery. This is because the error generated when calculating the remaining power by calculating the current not only affects the life of the rechargeable battery, but also affects the driving state of the vehicle. If the remaining power calculated from the current is wrong, the charge and discharge are controlled according to the remaining power, which may cause overcharg...

AI Technical Summary

Problems solved by technology

However, it is difficult to accurately sense the current in a large current range

In particular, errors are prone to occur when detecting large currents

Moreover, this type will also cause detection errors due to the influence of the residual magnetic component of the component itself

Therefore, with this type, it is difficult to detect current with high accuracy in a large current range

On the other hand, the voltage type of the accumulating current detection resistor has the advantage of being able to detect the current with high accuracy, but it cannot detect the current during the period when the calculated current is communicated, and so on. High precision current detection

In particular, in the undetectable time zone, if the current changes, the detection error will increase, so there is a disadvantage that the current that changes rapidly cannot be accurately detected.

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