Hybrid analog digital control method and apparatus for estimatio

Details Hybrid analog digital control method and apparatus for estimatio Hybrid analog digital control method and apparatus for estimatio

1988-05-09

1990-08-28

Lall, Parshotam S.

Boots, shoes, and leggings

188299, 280707, G06F 1520

Patent

active

049530895

ABSTRACT:
An improved method and apparatus is provided for estimation of absolute velocity in active or semi-active suspension systems. A controller produces a signal estimate of absolute velocity which can be implemented by a control algorithm to attenuate motion between spaced members, such as in vehicular suspension systems. The controller performs time integration of an accelerometer input signal by an analog integrator means comprising a first-order low-pass filter. A digital feedback or offset means is utilized to stabilize the signal and constrain the constant and relatively low frequency components of the analog integrated signal about an oscillatory voltage range. A digital filter means receives the stable signal and removes selected constant and low frequency components of the signal to produce a signal indicative of absolute velocities for a frequency range of interest further stabilized about a select mid-range voltage value.

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