The release of the Hatz H-series started in 2014. Today, the model portfolio embraces various three-cylinder and fourcylinder models. The new generation of compact and efficient industrial engines follows a downsizing approach with common-rail technology and turbocharger.
A groundbreaking downsizing approach was adopted in development of the H-series engines. The key objectives were the reduction of size and weight with simultaneously higher power and good exhaust gas values. The results are very convincing: Weight and consumption values are lower than those of any other engine in this class. This could be achieved, among other factors, thanks to the iHACS technology (intelligent Hatz Advanced Combustion Strategy) with its sophisticated combustion chamber geometry, Bosch injection technology, minimised friction and a maximum charge air pressure of 1.7 bar.
All mechanical components were designed and developed with a conservative-innovative approach. The H-series engines are equipped with two valves per cylinder, achieving high efficiency, mechanical robustness and functional simplicity. This is expressed in turn by the familiar long service life. Use of premium products for all important components also underlines this.
One of the key factors for the high power density of the H-series is the common-rail system. Hatz opted for the Bosch off-highway CRS, a common-rail system with 1800 bar. It works with three precisely calculated injections per power stroke: A pre-, main- and post-injection. Together with the other Bosch components matched ideally to each other – high-pressure pump, injector control unit, and off-highway injectors – the perfect balance is achieved between dynamics, quiet combustion noise, low pollutant levels, and economy.
The exhaust gas return system was further developed by Hatz engineers to have a positive effect on the exhaust gas values. A pre-cooling unit for the exhaust gas return (EGR) significantly reduces the exhaust gas temperature before the EGR valve, protecting it against thermal damage and sooting. An optimized EGR-mixing-nozzle is also used. It uniformly distributes the recirculated exhaust gases together with the fresh combustion air to all four cylinders. Together with the common rail system, the result is an outstanding exhaust gas quality which ensures that the TIC models are only equipped with a diesel oxidation catalytic converter (DOC) and there is no need for an additional particle filter. Furthermore the engines significantly undercut the emission limits of EPA Tier 4 Final and EU Stage IIIB.
A maintenance interval of 500 hours means the engine scores top points with regard to customer friendliness and reliability. The extended intervals are due to hydraulic valve adjustment and large-sized filters. Additionally, the engine has a shut-off sensor system that switches off the engine in an emergency to avoid major damage. The robust construction and careful selection of all components ensure that the engine is fit for the most demanding applications.