Advanced diagnostics of high-pressure diesel injection systems

Abstract

The article examines modern diagnostic methods for diesel high-pressure fuel systems, specifically the Common Rail accumulator-type system. Particular attention is paid to the systematization of approaches for detecting faults in precision components, such as electromagnetic or piezoelectric injectors and high-pressure fuel pumps (HPFP), which allows for increased accuracy in defect localization.

The object of the investigation - The methods and tools for technical diagnostics of fuel injection equipment in modern diesel engines.

A comprehensive diagnostic process is considered, including visual assessment, exhaust gas color analysis, the use of on-board diagnostics (OBD), and instrumental testing using a digital oscilloscope. It has been established that the integration of digital technologies allows for real-time monitoring of fuel delivery correction parameters via data loggers or oscilloscopes, which simplifies the detection of cylinder imbalance.

A methodology for non-intrusive testing of HPFP performance and system tightness using fuel rail pressure waveforms is described. An algorithm for assessing the condition of electromagnetic and piezoelectric injectors is defined through the analysis of voltage signals, current strength, and activation time, as well as fuel return flow control.

The stages of testing fuel equipment on diagnostic benches, based on measuring electrical parameters, dynamic characteristics, and hydraulic indicators under various load modes, are covered in detail. It is proven that this approach provides the most reliable results when making decisions regarding the repair or replacement of units.

The results highlighted in the article can be used to develop structured maintenance algorithms that minimize operation and repair costs for modern diesel engines.