Measuring and testing – Fluid pressure gauge – Mounting and connection
Reexamination Certificate
1999-02-02
2001-04-24
Oen, William (Department: 2855)
Measuring and testing
Fluid pressure gauge
Mounting and connection
Reexamination Certificate
active
06220101
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to measuring pressure, and particularly to using a series of sensors to measure a variety of different pressures in a system.
In many different systems, and particularly, in the braking system of an automobile, it is often necessary to measure a variety of different pressures in the system. These measurements are then used to indicate the operating condition of the system or to control the operation of the system. In the case of an automobile braking system, brake fluid pressures in each of the brake fluid lines are measured and these measurements are used to control the braking force of the brakes at each wheel end housing. In known systems for measuring brake fluid pressure, a pressure sensor is usually mounted in the wheel end housing in fluid communication with the break fluid to measure the pressure of the brake fluid. Each of these pressure sensors requires temperature compensation and signal conditioning, as well as an electrically conductive cable connecting the pressure sensor to the electrical system of the automobile.
SUMMARY OF INVENTION
The use of a different discrete sensor for each of the brake lines wherein each sensor has its own connecting cable, signal conditioning circuitry, and temperature compensation circuitry, adds to the cost of the brake system and can compromise the reliability of the system. Accordingly, the invention provides a housing having a plurality of mounting apertures and a plurality of sensors mounted in the mounting apertures, respectively. A plurality of lines are connected at one end to the sensors, respectively. The housing includes signal conditioning and temperature-compensating circuitry for each of the pressure sensors.
REFERENCES:
patent: 4872349 (1989-10-01), Espiritu-Santo
patent: 5003818 (1991-04-01), Hoodenpyle et al.
patent: 5564434 (1996-10-01), Halperin et al.
patent: 5584543 (1996-12-01), Sawada
patent: 5592384 (1997-01-01), Wolf
Marcelle Jesse
McCulley Wendell
Rozgo Paul
Ryall Gary
Schloss James
Michael & Best & Friedrich LLP
Oen William
SSI Technologies, Inc.
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