The engine manufacturer Kohler / Lombardini, has introduced its new KDI Diesel range, Kohler Direct Injection, overlooking the entry into force of the forthcoming laws on emissions (Tier 4 final, above 19kW in the U.S. , Stage IIIB, above 37kW in the EU)
Innovation in this family of engines allows clean combustion limiting emissions, without using any post-treatment system, while guaranteeing high performance.
Excellent power and torque values compared to the reduced size and lack of systems to reduce emissions, such as the DPF, translate into benefits for all OEMs who can replace their existing engines for lower cylinder capacity engines while allowing them to reduce consumption and elapse service intervals since dealing with the regeneration process is not required.
Main Technical Specifications
The project was developed aiming at a clean combustion process, made possible through a latest generation high pressure Common Rail injection system (2000 bar). This injection system is equipped with the EGR valve (electronically controlled). This valve enables recirculation of the correct amount of combustion gases liquid- cooled through a water / air exchanger, allowing to comply with emission levels while offering unique features with no need of “after-treatment” systems.
Kohler / Lombardini have selected the most advanced common-rail system available in the market. The system has been specifically designed for extreme durability and resistance to the most difficult conditions of use, typical in industry and construction applications. The high pressure pump can achieve the 2,000 bar. This, together with the nozzles with G3S solenoid, excellently allows dosing the fuel during the injection process.
A four valves per cylinder configuration has been designed
to accommodate the injector in a perfectly vertical and centered position with respect to the combustion chamber. This solution allows to optimize the filling, as well as the fuel atomization and mixing with the oxygen present in the combustion chamber.
The intake collector and combustion chamber have been developed through careful fluid-dynamic analysis (CFD Analysis) in order to achieve efficient combustion.
Turbocharger and after- cooler
The turbocharger with “waste-gate” valve has been perfectly calibrated to reduce any delay in response, ensuring a smooth torque and power delivery. A large air flow and intercooler use contribute to achieving the emission levels allowed and high torque performance at low revs.
Likewise, the turbocharger features special lubrication technical solutions and oil check to ensure performance and reliability over time.
The exhaust gases recirculation system, resulting from a detailed CFD analysis, consists of two cooling stages to optimize heat exchange without penalizing the dimensions. Furthermore, the positioning in the hot side, prevents any blocking of the EGR valve, thus ensuring maximum reliability.
Electronic control unit – ECU:
The “Common Rail” injection system along with the electronic control module required to manage it, are both state of the art technology and have been specifically developed to equip HEAVY DUTY applications in industry and construction sectors.
The control module provides full control of the engine calibration parameters to achieve the performance and emission levels. The CAN-BUS system provides an interface for direct communication between the motor and all electronics applications.