Process for testing the operating efficiency of exhaust gas cata

Details Process for testing the operating efficiency of exhaust gas cata Process for testing the operating efficiency of exhaust gas cata

1994-02-02

1995-07-25

Raevis, Robert

Measuring and testing

Simulating operating condition

Marine

60277, G01M 1500

Patent

active

054351723

ABSTRACT:
For testing the conversion rate of exhaust gas catalysts inserted in an exhaust gas train of an internal-combustion engine, a process is provided which first requires a first operating condition during a time period while specified marginal requirements are met. If these requirements are met, an exhaust gas pulse is generated during a second time period, for example, during a coasting operation, which exhaust gas pulse does not correspond to this condition. The reaction of a temperature sensor which is arranged downstream of the catalyst is then analyzed. If the change of the exhaust gas temperature because of the exhaust gas pulse is not within specified limits, a signal is triggered which indicates an unacceptably low conversion rate.

REFERENCES:
patent: 5060473 (1991-11-01), Nakagawa
patent: 5133184 (1992-07-01), Geiger
patent: 5191762 (1993-03-01), Kuroda et al.
patent: 5265416 (1993-11-01), Hamberg et al.

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