EXHAUST GAS TREATMENT APPARATUS FUNCTIONALITY CHECK

摘要

An exhaust fluid treatment apparatus may be used to treat exhaust fluid emitted by a combustion engine. It may be desirable to check the functionality of the exhaust fluid treatment apparatus. A method of monitoring operation of an exhaust fluid treatment apparatus is described. The method may comprise comparing a calculated temperature difference with an expected temperature difference associated with combustion of fuel. If the calculated temperature difference is within an acceptable margin of the expected temperature difference, further fuel injection may be permitted. If the calculated temperature difference is outside the acceptable margin of the expected temperature difference, a temperature of the exhaust gas upstream of the exhaust fluid treatment apparatus may be increased.