Patent ID: 9658177
Date: 2017-05-23
CPC Classifications: B01D,F01N,F02B,G01M,G01N,Y02T

Claim:
1. A method for detecting the presence of a catalyst, the method comprising: measuring a flow rate of exhaust gas within an exhaust gas tube; measuring an inlet temperature of the exhaust gas at an inlet of the exhaust gas tube; calculating an expected temperature time delay as a function of the measured flow rate; measuring an outlet temperature of the exhaust gas at an outlet of the exhaust gas tube; calculating a delayed inlet temperature based on the calculated expected temperature time delay and the inlet temperature; calculating a first difference between the measured outlet temperature and the inlet temperature and a second difference between the measured outlet temperature and the delayed inlet temperature; determining a catalyst is not present if the first difference is the same or smaller than the second difference, and a catalyst is present if the second difference is smaller than the first difference.