Hydrogen electronic injection system for a diesel power generator

•Hydrogen injection electronic control system developed for diesel power generator.•Main input signals to injection system are crankshaft speed and load power demand.•Injection open period presented for varying hydrogen concentration and load demand.•Hydrogen mass flow rate through injectors shown for varying concentration and load.

This work presents an electronic control system developed for hydrogen injection in a diesel power generator. The full system is basically constituted by a gas fuel injection rail with injection valves, a speed sensor and an electronic control unit. The electronic injection system was installed and tested in a diesel power generator of 44 kW rated power. The tests were carried out with hydrogen injected in the intake manifold and diesel oil directly injected in the combustion chamber. The results show the injection valve opening periods necessary to obtain hydrogen mass flow rates equivalent to 5%, 10%, 15% and 20% of the diesel oil mass replaced. The measured hydrogen mass flow rate injected is presented as a function of load power demand and hydrogen concentration in the fuel.