On-board diagnostics for an exhaust gas catalytic converter and detection of aging

US10539060B2 · kind B2 · utility

Assignee

• CPT Group GmbH · US

Inventors

• Ralf Moos · Friedrichshafen, DE
• Willibald Reitmeier · Hohenschambach, DE
• Markus Dietrich · Regensburg, DE
• Denny Schädlich · Neustadt, DE
• Markus Hien · Brück, DE
• Katharina Burger · Munich, DE

Key dates

• Filing date: Aug 2, 2017
• Grant date: Jan 21, 2020
• Expiry date: Aug 2, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Various embodiments include a catalyst measuring system for on-board diagnostics and for determining the aging of an SCR catalytic converter for a vehicle comprising: a processor; an SCR catalytic converter for purifying exhaust gas of the vehicle; a high-frequency sensor for determining the ammonia loading of the SCR catalytic converter; a NOx sensor for sensing the NOx concentration downstream of the SCR catalytic converter; and an ammonia dosing system for injecting ammonia into an exhaust system of the vehicle. The control device instructs the ammonia dosing system to inject ammonia selectively into the exhaust system at a plurality of different dosing rates. The control device evaluates data received from the NOx sensor and of the high-frequency sensor to calculate the ammonia dosing rate.