Patent ID: 8211293
Filing Date: 2012-07-03
Classification: G01N,Y02A

Abstract:
1. A method of correcting NO x sensor, the method being adapted for correcting an NO x concentration that an NO x sensor detects actually, the NO x sensor being disposed in an exhaust-gas flow passage of vehicle, and comprising a porous diffusion-resistance layer, an exhaust-gas chamber into which exhaust gases that have passed through the porous diffusion-resistance layer are introduced, and a detective unit for detecting an NO x concentration in the exhaust gases that are introduced into the exhaust-gas chamber, the method comprising the steps of: preparing a corrective map in advance, the corrective map recording relationships between temperature physical quantities that are relevant to a temperature of the exhaust gases, oxygen-concentration physical quantities that are relevant to an oxygen concentration in the exhaust gases, and an existing proportion of at least one of NO and NO finding the existing proportion with reference to the corrective map using the temperature physical quantities that are detected actually and the oxygen-concentration physical quantities that are detected actually; and correcting the NO