Air-measuring device

US5167147A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Klaus-Juergen Peters · Marbach am Neckar, DE
• Walter Bosch · Esslingen am Neckar, DE
• Hans-Peter Stiefel · Ditzingen, DE
• Karl Gmelin · Flein, DE
• Kurt Frank · Schorndorf, DE
• Thomas Schwegel · Lambach, DE

Key dates

• Filing date: Mar 1, 1991
• Grant date: Dec 1, 1992
• Expiry date: Mar 1, 2011

Classification

• Technology area (CPC G): Physics
• CPC primary: G01F5/00
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An air-measuring device for measuring the air mass taken in by an internal combustion engine which has a main flow channel, having a venturi section, and a temperature-dependent measuring resistor arranged in a bypass channel, the bypass channel opening upstream and downstream of the smallest flow cross-section of the venturi section in the direction of flow, in order to reduce the noise component in the measurement signal of the measuring resistor a channel region with an inlet and outlet opening is formed in the bypass channel, which channel region accommodates the measuring resistor in a central portion. The channel region is designed in such a way that the ratio of the flow cross-section of the central portion to the smallest cross-section of the venturi section is from 1:8 to 1:25 and the ratio of the cross-section to the cross-section of the inlet and outlet opening is in each case from 1:1 to 1:2.