Analysis and diagnosis of the electronic fuel injection control system HEUI CAT-3126

Abstract

The 3126 HEUI diesel engines for trucks use a fuel system of hydraulically activatedelectronic unit injectors. The injection pump, the fuel line and the injectors that were used in theengines with mechanical injection system have been replaced with a hydraulic electronic unitinjector in each cylinder. The HEUI system is a proven high-pressure direct injection fuel system.This system electronically monitors the controls of the operator and the machine to improve theperformance of the engine. The HEUI system is unique in its ability to independently control theinjection pressure throughout the engine's operating range. This allows a complete control of thetiming, duration, performance and efficiency of the injection. It has an injection controltechnology that modifies the characteristics of heat evolution of the combustion process tosignificantly reduce the levels of noise and emissions. The exhaust smoke is considerablyreduced by precise electronic control of fuel injection limits and injection timing of the HEUIsystem. The motors implemented with the HEUI System have the following characteristics.Superior performance - A new class of trucks to achieve high production and low cost per ton intransport applications in mines and quarries. Reliable and durable operation. - Its robustconstruction and ease of maintenance guarantees a long service life with low operating costs.