Downsizing Approach Optimizes Weight and Consumption
The development of the H-Series engines followed a groundbreaking downsizing approach. The primary goals were to reduce size and weight while maintaining high performance and good emissions values. The result is convincing: the weight and consumption values are as low as with no other engines in this class. The responsible factor is, not least, the iHACS technology (intelligent Hatz Advanced Combustion Strategy) with its optimized combustion chamber geometry, Bosch injection technology, minimal friction, and a maximum boost pressure of 1.7 bar.
Optimal Combustion Strategy
for Minimal Emissions
The exhaust gas recirculation system has been further developed by Hatz engineers to positively influence the emission values. A pre-cooling section for the exhaust gas recirculation (EGR) significantly reduces the exhaust gas temperature before the EGR valve, thus protecting it from thermal damage and fouling. Additionally, an optimized EGR mixing nozzle is used. It evenly distributes the recirculated exhaust gases along with fresh combustion air to all cylinders.
In conjunction with the common-rail system, this solution ensures excellent exhaust gas quality, allowing the TIC models of the H-Series to be equipped only with a diesel oxidation catalyst (DOC) and to forgo the additional installation of a particulate filter. Yet the engines still significantly exceed the emission limits of EPA Tier 4 final and EU Stage V.
