2017 – MASS-PRODUCED ENGINE
MWI AG operates a two cylinder engine of the latest engine generation on a specifically developed engine test stand. The objective of the test stand is to have a direct comparison with leading-edge engine concepts, while demonstrating fuel efficiency gains and pollutant reductions.
A Siemens electrical motor runs the combustion engine as a slave until the combustion engine operates on its own. The same electrical motor then applies a load on the combustion engine (generator principle) to bring it to the adjusted test parameters. One of the two cylinders is in this case operated with the original spark ignition, while the other is operated with the MWI microwave ignition. The temperatures and lambda values are measured on each of the two exhaust manifolds. The original engine control unit is used to operate the cylinder with the spark ignition, while operating parameters are specifically generated for the cylinder with microwave ignition. The objective in this case is to control and measure the leaning out and injection timing of the fuel.
The two pressure increase curves in the figure shown here are intended to illustrate that microwave ignition releases significantly more effective output while injecting the same quantity of fuel per cylinder, as compared to conventional spark injection. As a function of the particular parameter settings, the pressure increase curve is steeper for microwave chamber combustion than for spark ignition. This means that the MWI combustion is faster and therefore more efficient. The yellow curves show higher maximum pressures, while their surface area integral illustrates that the total output is higher than under the blue curve. At the same time, the microwave-based combustion in Cylinder 1 is cooler than in the comparative Cylinder 2 with spark ignition.
The demonstrated output increase of the engine is explained by the “cooler and faster combustion”.
The power increase generated by microwave ignition is likely to be of interest in motorsports.
MWI AG is currently predominantly focused on fuel and pollutant reduction. This objective is achieved by leaning out – or more specifically by injecting a reduced fuel quantity per operating stroke. The injected volumes can be very accurately adjusted separately for each cylinder.
The MWI chamber ignition method is already today able to meet the EU standards for 2021 through 2030!