Acceleration signal processing method of semi-active suspension
A semi-active suspension and signal processing technology, applied in vehicle suspension/shock absorbing mechanism testing, instruments, measuring devices, etc., can solve the problems of large amount of calculation and long calculation time, and achieve the effect of short signal delay time
Pending Publication Date: 2022-07-22
SICHUAN NINGJIANG SHANCHUAN MACHINERY
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[0006] For the acceleration signals existing in the prior art, steps such as Fourier transform, inverse transform, and least square fitting must be performed, which requires a large amount of computation and requires a certain amount of storage space to store data for analysis, and the computation takes a long time, which is not suitable for For the occasions where real-time control requirements are high, the present invention proposes a semi-active suspension acceleration signal processing method, the purpose of which is to obtain the final acceleration signal and speed signal as a vehicle through high-pass filtering and Kalman filtering Input to the control system
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[0028] like Figure 1-6 As shown, the present invention proposes an acceleration signal processing method for a semi-active suspension, including:
[0029] S1: Obtain the accelerator signal output by the acceleration sensor; such as figure 2 shown. The high-pass filtering in the time domain is performed on the signal collected by the acceleration sensor to filter out the DC component of the sensor. The frequency of high-pass filtering is 0.5 Hz. The sampling frequency of the accelerometer is 1kHz.
[0030] The zero-drift and integral trend terms of the acceleration sensor are low-frequency signals, the vertical vibration of the vehicle can be regarded as the resonance at the equilibrium position, and the vibration acceleration value basically conforms to the Gaussian distribution.
[0031] S2: A / D conversion and quantization are performed on the acceleration signal to obtain a digital acceleration signal and its acceleration value; such as image 3 shown.
[0032] S3: p...
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The invention discloses an acceleration signal processing method of a semi-active suspension, and aims to solve the problems that in the prior art, an acceleration signal needs to be subjected to Fourier transform, inverse transform, least square fitting and other steps, the calculation amount is large, a certain storage space needs to be occupied for data storage and analysis, the calculation time is long, and the calculation efficiency is high. The method comprises the following steps: acquiring an accelerator signal output by an acceleration sensor; performing A / D conversion and quantization on the acceleration signal to obtain a digital acceleration signal and an acceleration value thereof; performing high-pass filtering on the digital acceleration signal to obtain a high-pass filtering signal; setting parameters, performing Kalman filtering on the high-pass filtering signal to obtain a Kalman acceleration signal and a Kalman speed signal, taking the Kalman acceleration signal and the Kalman speed signal as the input of a control system, and judging the motion state of the vehicle suspension by the control system according to the input of the control system.
Description
technical field [0001] The invention belongs to the technical field of sensor signal processing, in particular to an acceleration signal processing method of a semi-active suspension. Background technique [0002] Vehicle semi-active shock absorber control usually adopts the "skyhook" Skyhook (SH) or acceleration (ADD) or skyhook-acceleration (SH-ADD) hybrid control method. The control system needs inputs such as body vibration speed and acceleration, wheel vibration speed and acceleration signals to judge the motion state of the vehicle suspension. The velocity signal usually cannot be directly collected by the sensor, but is obtained by collecting the acceleration or displacement signal for processing. The displacement is obtained by discrete differentiation, but the installation of the displacement sensor requires a large space. The acceleration sensor occupies a small space and is easy to arrange, and the speed can be obtained by integrating the acceleration. Due to t...
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IPC IPC(8): G01H17/00G01M17/04
CPCG01H17/00G01M17/04
Inventor 余让明王科郑华才
Owner SICHUAN NINGJIANG SHANCHUAN MACHINERY