APPARATUS, SYSTEM, AND METHOD FOR CATALYST PRESENCE DETECTION

摘要

A system to detect the presence of a catalyst includes an exhaust gas tube, a first temperature sensing device, a second temperature sensing device, a flow rate measurement device, and a processing device. The first temperature sensing device measures a first temperature of exhaust gas upstream of the exhaust gas tube. The second temperature sensing device measures a second temperature of the exhaust gas downstream of the exhaust gas tube. The processing device estimates an expected time delay between the measured inlet and outlet exhaust gas temperatures corresponding to a system with a catalyst present. The processing device may also determine the presence of a catalyst by comparing the measured second temperature to the measured first temperature and comparing the measured second temperature to an estimated delayed first temperature associated with the expected time delay.

主权项

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.