Brake-pressure modulator pilot unit

US7905557B2 · kind B2 · utility

Assignee

• WABCO GmbH · DE

Inventors

• Dieter Frank · Friesach, AT
• Juan Rovira-Rifaterra · Garbsen, DE
• Armin Sieker · Bielefeld, DE
• Andreas Teichmann · Altwarmbüchen, DE

Key dates

• Filing date: Jul 5, 2005
• Grant date: Mar 15, 2011
• Expiry date: Jun 30, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/88005
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A valve control unit including three valve units for two brake channels of an electropneumatic brake system is provided. Each valve unit is embodied as a valve modulator device for a braking pressure control circuit including an air inlet valve with a primary solenoid and a bleed valve with a secondary solenoid. Each modulator device armature includes a common solenoid guide arrangement controlled by the magnetic flux of a common magnetic coil. Independent operation of the armatures is achieved whereby flux through the secondary solenoid is weakened by a shunt in the flux circuit which causes a switching delay for the secondary solenoid relative to the primary solenoid. The magnetic resistance of a non-magnetic disc effects switch-off acceleration in the flux circuit with energized secondary solenoid, weakens the field and causes the secondary solenoid to revert to a spring-loaded base state at a higher flux than the primary solenoid.