Fault Diagnostic Strategy For Common Rail Fuel System

摘要

An electronic controller for a common rail fuel system detects a fault when a time sum accumulated error exceeds a threshold. The time sum accumulated error is left unchanged when the operating condition is transient, and either adds to or subtracts from the time sum accumulated error responsive to a rail pressure error and the operating condition being steady state.

主权项

1. A common rail fuel system comprising:
a variable output high pressure pump; a common rail with an inlet fluidly connected to an outlet of the pump; a plurality of fuel injectors with inlets fluidly connected to the common rail by individual branch passages; an electronic controller in control communication with the pump and the plurality of fuel injectors, and being configured to execute a fuel system diagnostic algorithm that detects an operating condition that is transient or a steady state, configured to add, subtract or leave unchanged a time sum accumulated error responsive to a rail pressure error and the operating condition, and configured to log a fuel system fault responsive to the time sum accumulated error exceeding a threshold magnitude; and wherein fuel system diagnostic algorithm is configured to change the time sum accumulated error more when the operating condition is steady state than when the operating condition is transient.