Device for determining the rotational speed

Details Device for determining the rotational speed Device for determining the rotational speed

1998-06-24

2001-06-19

Assouad, Patrick (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Speed

C073S504020

Reexamination Certificate

active

06249754

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention is based on a device for determining a rate rotation.
The use of rotation rate sensors that utilize the Coriolis effect is known in conjunction with systems for dynamic control in motor vehicles. Such rotation rate sensors typically comprise one or more masses that are set into mechanical oscillation at a constant frequency by an electrical oscillator circuit. One or more sensor elements are mounted on the mass or masses and output acceleration-dependent output signals and upon rotation of the oscillating system also detect the Coriolis acceleration acting on the oscillating masses. Such rotation rate sensors can be embodied for instance as micromechanical sensors. Typically, they are evaluated with the aid of an analog evaluation circuit. The problem in evaluating the signals of a rotation rate sensor is that the Coriolis acceleration signal, which is proportional to the rotation rate, must be extracted from the other signal components. In analog evaluation circuits, of the type known for instance from U.S. Pat. No. 4,759,220, complicated and expensive evaluation circuits are necessary.
SUMMARY OF THE INVENTION
The device according to the invention for determining a rotation rate has the advantage over the prior art of requiring only little expense for circuitry and calibration, which has pronounced advantages over analog concepts. The conversion of the acceleration signals into digital words with word widths that correspond to the resolution required is advantageously avoided. These advantages are attained by performing a purely digital processing, in which the pulse width modulated signal or sigma-delta encoded signals of the acceleration sensors are used directly. As a result, advantageously, sampling of the acceleration sensor signals is avoided, and thus it is possible to dispense with the attendant high sampling frequencies or sampling limitations, especially in the case of pulse-width-modulated acceleration signals.


REFERENCES:
patent: 4759220 (1988-07-01), Burdess et al.
patent: 4896268 (1990-01-01), MacGugan
patent: 5600064 (1997-02-01), Ward
patent: 5691471 (1997-11-01), Okazaki et al.
patent: 5890099 (1999-03-01), Abendroth

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