Pressure control process and apparatus

Fluid-pressure and analogous brake systems – Multiple systems – Fluid pressure and electric

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303 15, 303 20, 303155, B60T 1374

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active

057825416

ABSTRACT:
A process and an apparatus for pressure control, in particular, to adjust braking pressures in a utility vehicle, are proposed. Two individual controllers (10, 11) are assigned respectively to an inlet valve (2) and to a discharge valve (3). A pilot control value consisting of a fixed value y.sub.v and of a memorized value .DELTA.y.sub.v is additively input to the output values of these controllers. The memorized components .DELTA.y.sub.v are the integration result of the I (integration) components of the individual controllers (10, 11) for the duration of a pressure increase (inlet valve) or pressure decrease (discharge valve). The memorizing process is ended after approximately five to ten brake applications and the value of .DELTA.y.sub.v which is then reached is used as an individual pilot control value.

REFERENCES:
patent: 5405182 (1995-04-01), Ewe et al.
patent: 5452735 (1995-09-01), Gamble et al.
patent: 5560688 (1996-10-01), Schappler et al.
Richl, Helmuth: Trends bei der Entwicklung von Hydraulik-Ventilmagneten. In: O + P Olhydraulik und Pneumatik 35, 1991, Nr. 8, pp. 613-619.
Forschungsfonds. IN: O + P Olhydraulik und Pneumatik 35, Nr. 10, pp. 781-782.
Keller, Horst: Adaptive Regelung eines pneumatischen Linearantriebs. In O + P Olhydraulik und Pneumatik 35, 1994, Nr. 4, pp. 220-225.

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