Abstract: An electronic fuel injecting method and device for an internal combustion engine, wherein a correction in accordance with the operating conditions or the like of the engine is effected on a basic injection time obtained in accordance with an intake pressure or an intake air flowrate, and a rotational speed of the engine, to thereby provide fuel in synchronism with the rotation of the engine. When the operating conditions of the engine reach a predetermined condition, fuel is provided at a predetermined injection time not in synchronism with the rotation of the engine. When requirements for non-synchronous injection take place during synchronous injection, the time period for the synchronous injection is prolonged by the appropriate non-synchronous injection time. When more than one non-synchronous injection requirement occurs during a single synchronous injection, the synchronous injection time is lengthened by a time corresponding to only one of the non-synchronous injection requirements.

Abstract: An improved high-efficiency electrostatic air filter device which has a high efficiency of dust collection and a long service life. The device is composed of a charging section having a plurality pairs of electrodes to charge the dust particles in the gas to be treated; and a dust collecting section which is provided with a corrugated filter medium and spacer electrodes that are disposed in the troughs of the corrugations of the filter medium, and one of each pair of the electrodes in the charging section and the specer electrodes on one side of the filter medium in the dust collecting section are applied with high electric voltage.

Abstract: In an electric dust collector including a case having a dust-containing gas inlet and a clean gas outlet; a charging section for electrically charging the dust particles by means of the corona discharge on the side of said dust-containing gas inlet of said case; a collecting section for collection the dust particles passing through said charging section and electrically charged, by means of the Coulomb force; and a d.c. high voltage power source for applying a d.c.