Method for rapidly measuring impedance of vehicle mounted battery
A vehicle battery and measurement method technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, measuring electrical variables, etc., can solve battery monitoring situations that cannot meet high real-time requirements, cannot be well adapted to vehicle conditions, Problems such as long measurement time
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[0036] For a continuous signal f(t), its continuous wavelet variation is defined as follows:
[0037]
[0038] In formula (1), is the wavelet transform coefficient, which is obtained by convolving the original signal f(t) with the mother wave ψ(t), s is the scaling factor, and τ is the time parameter. Wavelet transform is to realize the expansion and translation of the mother wave ψ(t) by adjusting the values of s and τ, just like focusing and translating the target signal with a lens, so as to achieve higher time resolution at higher frequencies. Lower frequencies have the effect of higher frequency resolution. The battery signal includes a voltage signal and a current signal, and the voltage signal and the current signal are both vector signals, so in order not to lose the vector information of the original signal, the complex Morlet function should be selected as the wavelet basis function, which is defined as follows. where f c Indicates the center frequency of th...
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