2results about How to "Test data is stable" patented technology

A kind of power module dynamic switch parameter calculation method, comprising: using dynamic double-pulse test waveform to power module, the center point position of each pulse is calculated out;Waveform data of gate voltage waveform Vge, current waveform Ic and bus voltage waveform Vce are respectively carried out zero drift processing;According to the three waveform data obtained after eliminating zero drift, the basic parameters Vge- Pos 、Vge‑ Neg 、U dc 、I CM , first pulse turn-off Turn- off And the waveform data of second pulse turn-on Turn- on Time period in double pulse are respectively obtained, and the turn-off and turn-on process parameters are calculated, and the starting value and end value of each corresponding parameter are calculated according to the percentage of each parameter in turn-off and turn-on process, and finally the corresponding parameters are obtained.The present application does not need to use filter, and is realized based on software algorithm, which can ensure that the test data fluctuation is not too large due to waveform oscillation or waveform difference, and can make the test result close to the actual value, so as to ensure the authenticity of data.

The present application relates to the technical field of chassis suspension system testing, and specifically discloses a vehicle unsprung mass measurement method, device, equipment and storage medium, the method comprising: controlling a target vehicle to move vertically up and down at a horizontal plane, the stiffness characteristic of the suspension system of the target vehicle being linear; obtaining spring elasticity and wheel normal pressure of at least two sampling points in the vertical up-and-down movement process of the target vehicle, the wheel normal pressure being the pressure given to the vehicle by the horizontal plane in the vertical direction; determining the mapping relationship between the spring elasticity and the wheel normal pressure based on the obtained spring elasticity and wheel normal pressure; calculating the target wheel normal pressure corresponding to zero spring elasticity according to the mapping relationship, and calculating the unsprung mass according to the target wheel normal pressure. The present application improves the accuracy of unsprung mass measurement.