On the preliminary results of Development of MPI low pressure Dual-Fuel engine, the Master-Slave Dual-Fuel approach was replaced by a new engine management system which operates both Diesel and Gas injection at the same time in a unique control unit, developed by IDIADA.
MAN and IDIADA are developing within HDGAS project an advanced dual-fuel LNG prototype truck which aims to demonstrate enhanced efficiency and emissions improvement when compared to state of the art Dual-Fuel trucks. The preliminary results of Development of MPI low pressure Dual-Fuel engine, where the Master-Slave Dual-Fuel approach was replaced by a new fully-integrated engine management system which operates both Diesel and Gas injection at the same time in a unique control unit, tailored by IDIADA for HDGAS proejct. This new unit integrates all the functionalities of the engine independently of the fuel used and allows the engine to run on optimized Dual-Fuel mode and operate in Diesel as it was possible before with the Bosch EDC17 unit. This functions, algorithms and strategies were performed to achieve higher efficiency in terms of combustion and pollutants reduction.
The MAN engine was operated first on pure diesel mode to assess the functional operation of air path systems (turbocharger and throttle mainly) and Diesel injection system (Common rail pump, injectors, etc). Functional tests were performed to assess the capabilities of the new management system (i.e to handle up to 6 injections per cycle on any single cylinder). Engine was firstly calibrated to run on Diesel in specific operating modes (idle, low speed, high speed) at low loads before it was calibrated for higher loads.
Once Diesel operation was demonstrated, the engine was calibrated in Dual-Fuel mode to perform initial assessment of the operation and capabilities of the system when running with both fuels operated by a single management system, thus allowing from now onwards to focus in the optimization of the Dual-Fuel operation taking advantage of an accurate management of all the engine systems (EGR, Throttle, WG, Commonrail pump, Diesel injectors) in combination with the gas systems (Gas rail, gas injectors, gas pressure regulator, etc). The engine will be further optimized in the next months to meet the Diesel and Dual-Fuel emissions and functionalities necessary to run on engine test bed and truck.
Figure 2: PUMA interface
Figure 3: INCA window, calibration parameters in Dual-Fuel mode
View the report: MPI low-pressure dual-fuel engine by Idiada (Public summary)