Vehicle suspension control with relative suspension position sen

Details Vehicle suspension control with relative suspension position sen Vehicle suspension control with relative suspension position sen

1992-03-26

1993-10-19

Chin, Gary

Boots, shoes, and leggings

280707, 280840, B60G 1704

Patent

active

052551911

ABSTRACT:
A vehicle suspension control includes a differentiator for deriving an analog relative suspension velocity signal from a relative suspension position sensor; and the analog relative suspension velocity signal is A/D converted by digital signal processing apparatus at a predetermined sampling frequency. The differentiator comprises a bandpass filter having a linearly increasing gain and a 90 degree phase lead for differentiator action in a low frequency range of vehicle suspension resonances (0.5-20 Hz) in which signal differentiation is desired, a peak in gain and group delay at an intermediate frequency above the low frequency range of vehicle suspension resonances, at which vehicle suspension inputs are small, and a decreasing gain from the intermediate frequency to a higher aliasing frequency (500 Hz) related to the sampling frequency of the digital signal processing apparatus. The circuit is used in combination with a two pole low pass filter to further decrease gain above the intermediate frequency; and, even with the low pass filter, it has low group delay in the low frequency range.

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Operational Amplifier Characteristics and Applications, Robert G. Irvine, Prentice Hall, Inc., Englewood Cliffs, N.J. 1981, pp. 156-162.

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