Abstract: A reciprocating internal combustion engine operates by drawing at least substantially only air into the cylinder during the suction stroke and, at the final phase of the compression stroke, injecting gaseous fuel into the cylinder under high pressure. At least part of the fuel is directed to a hot glow body stationarily arranged within the combustion chamber of the cylinder to cause ignition.

Abstract: At least part of the heat energy contained in the exhaust gases of a diesel engine provided with turbo apparatus is recovered before leading the exhaust gases into the turbo apparatus, and at least the major part of the recovered heat energy is used for producing secondary energy to be availed of independent of the production of mechanical energy by the engine. The heat energy recovered can, with advantage, be utilized for hot water or steam production.

Abstract: An improved combustion process for an internal combustion engine including cylinders provided with inlet and outlet valves as well as inlet and outlet ducts. During a suction stroke with the outlet valve closed, fuel is fed into the cylinder through separate feeding valve means for providing a lean fuel/air mixture in the cylinder; during a compression stroke a first additional charge of fuel is fed into the cylinder by use of a considerable over pressure for igniting the lean fuel/air mixture and after ignition of the fuel/air mixture a second additional charge of fuel is fed into the cylinder for increasing the effective mean pressure of the engine. The second additional charge of fuel comprises a substantial part, and for achieving maximum mean effective pressures the main part, of the fuel fed into the cylinder during a working cycle of the process.