Mazda: Two-stroke engine with compressor and direct injection, patented

Mazda is the world’s most “against the grain” manufacturer: where others have given up, they experiment and research. Even in the neglected two-stroke engines…

August 7, 2024

sIf you think some leadership styles were in place now It was erased by progress, Here comes Madza with a surprise: Is Diesel dead? And we do 3.3L Diesel Super efficient. Wankel? It is good to work as a range extender for MX-30 R-EV. Even the engine Two hits, Which currently exists only for some types of motorcycles, could return to the forefront through a patent filed in the United States. However, Mazda adds to the two-stroke cycle the characteristics of the operating cycle already marketed with a four-stroke cycle with a compressor, direct injection and valves, SkyActiv.

Cross section of Mazda two-stroke engine

Like diesel and gasoline together, but with two strokes.

theThe drawing is registered with the patent number. US20220034265A1 In 2022, the cylinder section shows a double overhead camshaft distribution, a belt-driven Roots volumetric compressor, and a spark plug and injector in the center of the combustion chamber. The intake and exhaust valves have variable opening and closing times. The patent also emphasizes the fact that a similar engine could only operate by compression self-ignition, but it would be very noisy, so a spark plug was added to control detonation at a certain moment. In particular, the patent speaks of a Operating cycle twice which involves ignition Spontaneous by pressure When the engine is at low load, during ignition It becomes a matter When the load is higher. From a conceptual point of view it is an evolution.hcci Already seen on engines SkyActive Which is used however 4 lap cycle. According to Mazda’s patent data, this project will result in excellent combustion efficiency at all speeds and the bulk of the work is attributed to the variable valve timing, which does not completely solve the typical problem of two-strokes, namely the losses that occur when it is necessary to vent the burnt gases (wash losses). Which can lead to smoke coming out of the exhaust due to unburned fuel. As with all patents, it is not certain that Hiroshima will put this engine into production, but it is certainly testing it.