Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 08, 2024 - September 11, 2024
As global warming becomes more serious, decarbonization of internal combustion engines is being promoted and electric vehicles are expected to play a more active role. We focused on the opposed piston engine as an engine for this purpose. Opposed piston engines are considered to be suitable for power generation engines because of their features such as low cooling loss and low vibration. This paper reports the results of a study on the basic characteristics of a two-stroke opposed piston engine, the effects of the number and position of spark plugs on combustion in order to shorten the combustion time, and the validity of a Pre-chamber combustion effective in improving the combustion period, with the aim of solving vibration problems and further improving thermal efficiency. Experiments were conducted at a constant engine speed of 3000 rpm, ignition timing of -25, -30, and -35 [deg. ATDC], and gasoline was used as test fuel. From the experimental results, it was found that the in-cylinder pressure was higher in the two-point ignition than in the one-point ignition because the flame spread distance was shorter in the two-point ignition. Since the experiments could not be conducted in the stable combustion region of the Pre-chamber combustion, experiments in the stable combustion region are needed.
