Braking pressure modulator for a trailer with electronic braking system

US6467854B2 · kind B2 · utility

Assignee

• Wabco GmbH & Co. Ohg. · DE

Inventors

• Dieter Frank · Friesach, AT
• Gerdt Schreibert · Altwarmbüchen, DE
• Peter Homann · Neustadt, DE
• Armin Sieker · Bielefeld, DE
• Andreas Kranz · Wunstorf, DE
• Hans-Klaus Wolff · Springe, DE
• Dirk Meier · Saalfeld, DE

Key dates

• Filing date: Feb 23, 2001
• Grant date: Oct 22, 2002
• Expiry date: Feb 23, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16K31/06
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A pre-engagement unit for a braking pressure modulator for a pressure regulating circuit of an electronic braking system includes an electrically actuated valve system with three substantially identical 2/2-way solenoid valves. First and second terminals of the 2/2-way solenoid valves are selectively connected to the pneumatic inlets and output terminals of the pre-engagement unit, and to each other so that the first 2/2-way valve serves as an air admission valve for supply pressure, the second 2/2-way solenoid valve serves as an air admission/exhaust valve for redundancy pressure, and the third 2/2-way solenoid valve serves as an exhaust valve. Thereby, the pressure in the pressure regulating circuit can be increased, decreased, or maintained. Desirably, the first, second, and third 2/2-way solenoid valves are connected in parallel to each other.