System and Method for Injector Fault Remediation

摘要

A machine includes an engine having an exhaust system. A diesel exhaust fluid (DEF) injector provides metered amounts of DEF and includes a valve adapted to selectively open in response to a command. A controller associated with the engine and the DEF injector monitors operation of the DEF injector to detect a fault and activates a failure remediation cycle when the fault has been detected. The remediation cycle includes heating the exhaust gas to heat the DEF injector and melt any urea crystals that may be causing the fault, and activating the valve of the DEF injector to evacuate molten urea from within the DEF injector.

主权项

1. A machine, comprising:
an engine having an exhaust system associated therewith; a diesel exhaust fluid (DEF) injector disposed to provide metered amounts of DEF into the exhaust system, the DEF injector including a valve adapted to selectively open in response to a command for injecting DEF into the exhaust system; and a controller associated with the engine and the DEF injector; wherein the controller is disposed to:
monitor operation of the DEF injector to detect a fault;activate a failure remediation cycle when a fault is detected, said remediation cycle including causing an increase in a temperature of an exhaust gas in the exhaust gas system to heat the DEF injector and melt any urea crystals that may be causing the fault, and activating the valve of the DEF injector to evacuate molten urea from within the DEF injector;determine whether the fault has been cleared; andwhen the fault is present for a predetermined period, set a failure flag signal.