Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1998-12-30
2000-12-05
Oberleitner, Robert J.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031192, 25112915, B60T 838
Patent
active
061556548
ABSTRACT:
In vibrating a spool of a spool-valve type electromagnetic proportional pressure control valve by applying a dither current so that no static friction acts on the spool, the dither effect tends to weaken in a region where the current is small and in a region where the current is so large as to cause magnetic saturation. An alternating dither current is superimposed on the current supplied to an electromagnet to vibrate the spool with an amplitude small enough not to affect the liquid pressure, and in a control region where the ratio of the solenoid force Fsol to the current I is small, the dither current is controlled so that its amplitude is larger or its frequency is lower than in other regions.
REFERENCES:
patent: 3709253 (1973-01-01), Spangenberg
patent: 4366524 (1982-12-01), Kuroiwa et al.
patent: 4434933 (1984-03-01), Tamura
patent: 4960365 (1990-10-01), Horiuchi
patent: 5636908 (1997-06-01), Yamamuro
patent: 5667285 (1997-09-01), Seetharaman et al.
patent: 5791318 (1998-08-01), Schulz et al.
Kramer Devon
Oberleitner Robert J.
Sumitomo Electric Industries Ltd.
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