Arrangement for making contactless distance and pressure measure

Details Arrangement for making contactless distance and pressure measure Arrangement for making contactless distance and pressure measure

1998-01-13

2000-03-07

Williams, Hezron

Measuring and testing

Vibration

By mechanical waves

73618, 73632, 267 6419, B60G 1704, B60G 1708

Patent

active

060325356

ABSTRACT:
The invention is directed to an arrangement for making contactless distance and pressure measurements within an air spring. With a single arrangement, the exact elevation of the spring as well as the spring pressure can be determined. This permits optimal utilization of the axle loads of a multi-axle vehicle and permits adjustment of the distance between the chassis and the axle. In the arrangement, an ultrasonic configuration makes contactless distance measurements in accordance with the pulse/echo method. The arrangement includes a transmitter/receiver component (4) mounted on the chassis and a first reflector (24) defining a first reference distance (16) therebetween. The component (4) and a reflector (6) define a measuring distance (30). The reflector (6) is fixedly mounted to the axle. The transmitter/receiver component (4) is elastically supported by a suspension (10) in a pipe stub (8) fixedly mounted to the chassis. A second reflector (28) is fixedly mounted on the pipe stub (8) and defines a second reference distance (18) to the component (4). The displacement of the elastically-supported component (4), which is caused by the internal pressure, is given by a comparison of the propagation times assigned to the two reference distances (16 and 18). In this way, the internal pressure of the air spring is determined.

REFERENCES:
patent: 2743429 (1956-04-01), Erdman et al.
patent: 4543649 (1985-09-01), Head et al.
patent: 4561064 (1985-12-01), Bruggen et al.
patent: 4798369 (1989-01-01), Geno et al.
patent: 4938066 (1990-07-01), Dorr
patent: 5859692 (1999-01-01), Ross, Jr. et al.
patent: 5936161 (1999-08-01), Fischer

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