Test device for vehicles having a wheel rotation speed sensor which is sensitive to magnetic fields

US5594173A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Gerhard Frey · Eßlingen, DE
• Thomas Hirth · Bogen, DE
• Dieter Grohmann · Gechingen, DE
• Willi Reichart · Nagold, DE

Key dates

• Filing date: Aug 18, 1995
• Grant date: Jan 14, 1997
• Expiry date: Aug 18, 2015

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P21/02
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A test device for vehicles has a wheel rotation speed sensor which is sensitive to magnetic fields. The test device, having a wheel rotation simulation device, contains a sensor stimulating magnet coil, which can be positioned in the magnetic field region of the sensor such that a magnetic field coupling is provided. A control unit, drives this magnet coil with an AC voltage at a frequency which determines the wheel rotation speed. This allows the performance of functional tests of components which are sensitive to wheel rotation speed while keeping the wheels stationary. In addition, a compact roller unit, which is preferably transportable, is provided in order to carry out actual wheel rotations in order to make it possible to test further components, such as the brake system or electronic transmission control. Consequently, component tests which are sensitive to wheel rotation speed can be carried out at the production location and in workshops in a manner which is flexible and optimized with respect to time and cost.