Fluid-pressure and analogous brake systems – Pipeless valves
Patent
1994-02-02
1994-12-13
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Pipeless valves
188181C, 303 20, B60T 832
Patent
active
053724100
ABSTRACT:
An anti-lock braking system includes three integrated circuits (an integrated voltage regulator and two different microcontrollers) which perform different functions but share the tasks of detecting malfunctions and shutting down the system when malfunctions are detected. The two different microcontrollers perform different functions, have different circuitry, and execute different software. Typically, a first microcontroller receives wheel sensor signals, calculates wheel velocities and accelerations, and operates mechanical devices which control braking. A second microcontroller executes the main anti-lock braking software and determines from the velocities and accelerations when brakes should be released. All of the integrated circuits monitor each other and the other elements of the anti-lock braking system to detect malfunctions. Multiple shut down methods are provided so that a single chip failure can be safely handled. The three integrated circuits can be fabricated using different device technologies and design rules so that the operating environment of the anti-lock braking system is less likely to cause simultaneous failures in multiple integrated circuits.
REFERENCES:
patent: 4917443 (1990-04-01), Kramer et al.
patent: 5176429 (1993-01-01), Junichi et al.
patent: 5193886 (1993-03-01), Gloceri
patent: 5193887 (1993-03-01), Bleckmann et al.
Harper Thomas P.
Miller Roger L.
Butler Douglas C.
National Semiconductor Corporation
Nelson H. Donald
Roddy Richard J.
Wallace T. L.
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