| 摘要 |
An exhaust aftertreatment SCR system 100 has a controller 120 to diagnose errors with a dosing system 110 having a dosing module 112. The controller 120 may control a pump 118 to compensate for a loss in pressure when dosing reductant and may maintain the pressure as close to a target pressure by modifying a parameter affecting the operation of the pump 118. The modification of the parameter may be used to determine an estimated flow feedback. The controller 120 uses the estimated flow feedback data and commanded dosing amount data to calculate a percentage error in response to and using an integrated commanded flow and an integrated estimated flow feedback to detect errors of the dosing system. The errors may include an injector stuck closed error, a blocked pressure line error, a partial blockage of a pressure line or injector error, an injector stuck open error, a disconnected pressure line error, a leakage of a pressure line or injector error. The controller activates an error indicator and/or error code to another system. |
