INTRODUCTION

The French HDI engine series has gained significant popularity, particularly due to its adoption by various manufacturers. The 1.6 and 2.0 HDI engines, primarily used in passenger vehicles, were updated with the new "BlueHDi" generation, which includes 1.5, 1.6, 2.0, and 2.2-liter versions—all designed to comply with strict emission standards.

1.5 AND 1.6 BLUEHDI ENGINES

Equipped with Bosch’s Common Rail system, the 1.5 and 1.6 BlueHDi engines feature the CP4S1 high-pressure pump. This pump operates at 180 MPa and is synchronized with the timing system. Proper pump alignment is critical to prevent premature timing belt wear and minimize pressure pulsations. Recent models now use CRI2-22 injectors, capable of withstanding up to 2200 bar, improving hydraulic efficiency and leak resistance.

The 1.5 BlueHDi engine design includes the eSV valve, replacing the older ZME dosing valve. This technology enables precise pressure control, enhancing performance and reducing fuel consumption during low-load phases. The injection system must be rigorously tested to prevent leaks in both injectors and the pressure accumulator.

2.0 AND 2.2 BLUEHDI ENGINES

The larger 2.0 and 2.2-liter versions use a Delphi Technologies fuel system. Their high-pressure pump is regulated by an IMV dosing valve, with an optimized pressure management system. A key feature is the PLV drainage valve, designed to prevent rail overpressure. Maintenance of these engines requires attention to technical details, such as precise pump-to-injector synchronization, crucial to avoiding premature failures.

A notable aspect of BlueHDi engines is the complexity of the injector purging process, which must be executed correctly to prevent startup issues or irregular operation. Additionally, injectors require coding and calibration after installation, using a specific driving cycle.

CONCLUSION

The evolution of diesel engines and stringent environmental regulations demand constant adaptations in fuel control systems. While core operating principles remain similar, configurations vary significantly across generations, posing diagnostic and repair challenges for workshops. In-depth knowledge of these systems’ specifications is essential to avoid costly maintenance errors in BlueHDi engines.