Exhaust gas pipe for internal-combustion engines having a receiving opening for a heated probe for determining the oxygen content of the exhaust gases

US4617795A · kind A · utility

Assignee

• Daimler-Benz AG · DE

Inventors

• Jorg Abthoff · Plüderhausen, DE
• Hans-Dieter Schuster · Schorndorf, DE
• Gunter Loose · Waiblingen, DE
• Gunther Ebinger · Backnang, DE

Key dates

• Filing date: Mar 13, 1985
• Grant date: Oct 21, 1986
• Expiry date: Mar 13, 2005

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/1439
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A system is provided for measuring the amount of oxygen in exhaust gas emitted by an internal-combustion engine. The system includes an exhaust pipe for conducting engine exhaust gas and a probe for determining the oxygen content of engine exhaust gases. The exhaust pipe has a side wall formed to include an aperture for continuously discharging a portion of the engine exhaust gas flowing through the pipe. The system further includes a support housing for positioning the probe at a location outside of the exhaust pipe in proximity to the side wall aperture so that the probe is exposed to the engine exhaust gas portion discharged through the aperture and for collecting exhaust gas in a space surrounding the probe. The aperture is sized to permit exhaust gas collected in the support housing to be reintroduced into the exhaust pipe so that collected exhaust gas will be exchanged continuously with exhaust gas flowing through the exhaust pipe.