Method of diagnosing piezohydraulic diesel injectors

Abstract

The article presents a method for diagnosing piezohydraulic diesel injectors, which allows assessing their condition without the need to dismantle them from the engine, which is especially useful when it is impossible to remove the injectors without mechanical damage. For diagnostics, a comparative analysis of the parameters of all injectors is used, such as correction of cyclic fuel supply, calibration of zero supply, control signal parameters, injector resistance and fuel consumption for control. The method is especially relevant for complex designs of Common Rail fuel supply systems, which are widely used in modern diesel engines.

The study confirms that the technical condition of injectors can be determined by indirect signs that are detected when using diagnostic equipment. In practice, the method of assessing the condition of injectors by their operating characteristics is more often used, checking their tightness, the condition of the hydraulic compensator, the electrical parameters of the piezomodule, the minimum injector activation voltage and the amount of fuel supplied in different engine modes. The authors conduct diagnostics on a specific example (Kia Sportage car), where the proposed method showed effectiveness, identifying injector malfunctions without dismantling. The main conclusion is that this method can significantly increase the efficiency and accuracy of diagnostics, reducing maintenance costs by preventing the need to dismantle injectors.

Key words: electro-hydraulic and piezo-hydraulic injectors, internal combustion engine, diesel fuel systems, correction of cyclic fuel supply, calibration of zero supply.