Method and device for ultrasonic distance measuring

US5508974A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Dieter Meyer · Wolfsburg, DE
• Ulrich Kanzler · Stein, DE
• Klaus Krockenberger · Remchingen, DE
• Juergen Leinberger · Nuremberg, DE

Key dates

• Filing date: Oct 13, 1994
• Grant date: Apr 16, 1996
• Expiry date: Oct 13, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G01S15/18
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In a device for measuring the distance to an obstacle, a second transmission pulse as a control measurement for an ultrasonic distance measurement is transmitted only when an echo signal has been received for a first transmission pulse. In addition, a timing window, within which the expected echo signal falls when it is reflected by an obstacle, is created. In this manner, interference signals are advantageously suppressed and the measuring time is accelerated, so that for an application in a motor vehicle to measure distance, a current measured value is always known while the vehicle velocity and the path covered are taken into consideration.