Temperature sensor, sulfur component detector, and exhaust purification system for internal combustion engine

摘要

A temperature sensor includes temperature detecting means and at least one of a catalyst and an adsorbent applied to the surface of the temperature detecting means. At least one of the catalyst and the adsorbent catalyzes an exothermic reaction of a reactant in gas on the temperature detecting means. A temperature that is increased by the exothermic reaction is detected by the temperature detecting means. The catalytic efficiency for the exothermic reaction of at least one of the catalyst and the adsorbent is reduced by sulfur poisoning. The temperature sensor is disposed upstream of an exhaust purification system. Accordingly, it is determined that the temperature sensor is subjected to sulfur poisoning if the temperature detected by the temperature sensor is below a prescribed temperature.

主权项

1. A sulfur component detector comprising:
a temperature sensor disposed in a flow passage of gas and having at least one of a catalyst and an adsorbent, the temperature sensor being configured to detect a temperature of the gas, the temperature sensor having a surface to which the at least one of the catalyst and the adsorbent is applied, wherein the at least one of the catalyst and the adsorbent is configured to catalyze an exothermic reaction of a reactant that is contained in the gas, and the at least one of the catalyst and the adsorbent is a catalyst or an adsorbent whose catalytic efficiency for the exothermic reaction of the reactant in the gas is degraded by sulfur poisoning; and a control unit configured to determine whether a sulfur component is present in the gas, the control unit determining that the sulfur component is present in response to the temperature sensor detecting a temperature T1 of the gas increased by the exothermic reaction which is less than a temperature T0 of the gas increased by the exothermic reaction when the sulfur component is not present in the gas.