Control apparatus for internal combustion engine

摘要

An internal combustion engine includes an SCR system disposed on an exhaust passage and a particulate matter sensor disposed downstream of the SCR system, the particulate matter sensor for producing an output that corresponds to an amount of particulate matter deposited on an element section. A control apparatus for the internal combustion engine includes: means for detecting a condition of the element section being deposited with a urea-related substance; and means for controlling to bring a temperature of the element section to a first temperature range when the condition of being deposited with the urea-related substance is detected. The first temperature range is higher than a temperature at which the urea-related substance vaporizes and lower than a temperature at which the particulate matter burns. This prevents the urea-related substance from being deposited on an electrode of the particulate matter sensor and limits variations in an output of the particulate matter sensor.

主权项

1. An internal combustion engine comprising:
a selective catalytic reduction (SCR) system disposed on an exhaust passage; a particulate matter sensor disposed downstream of the SCR system, the particulate matter sensor producing an output that corresponds to an amount of particulate matter deposited on an element section, the particulate matter sensor comprising a heater; and a control unit programmed to:
estimate a condition of the element section being deposited with a urea-related substance; andcontrol the heater to bring a temperature of the element section to a first temperature range when the condition of being deposited with the urea-related substance is estimated, the first temperature range being (i) higher than a temperature at which the urea-related substance vaporizes and (ii) lower than a temperature at which the particulate matter burns.