| 摘要 |
PROBLEM TO BE SOLVED: To provide an engine capable of preventing adhesion of condensed water to a detecting section of an NOx sensor heated at a high temperature and thereby capable of preventing damage to the NOx sensor when an engine is left in an idling state for a long time period in an environment of a low outside air temperature.SOLUTION: An engine includes a urea water injection control section, an SCR catalyst, an engine speed detecting sensor, an NOx sensor, and a control section. The NOx sensor includes a detecting section for detecting nitrogen oxide contained in exhaust gas, and a heater section for heating the detecting section up to a temperature at which the nitrogen oxide can be detected. The control section prohibits heating treatment by the heater section when an idling state in which an engine speed is equal to or lower than a speed threshold is continued over prescribed time.SELECTED DRAWING: Figure 6 |
