Abstract: A multiple cylinder engine controls an air/fuel ratio accurately by improved detection of the fluctuations in a vacuum due to a change in the openings of throttle valves. The multiple cylinder engine includes a plurality of intake passages that independently feed intake air to cylinders; fuel injectors; throttle valves; a pressure sensor; and a fuel controller that controls fuel injection of each cylinder using the detected pressure. The multiple cylinder engine may further include a vacuum inlet passage having an inlet port opened into intake passages that introduces the pressure of the intake passages into the pressure sensor. The vacuum inlet passage preferably includes a throttle portion having a passage area of no more than one ninth that of the inlet port.

Abstract: A V-type 2-cylinder engine capable of distributing air-fuel mixtures equally to each cylinder, having a fuel injection device compact in its arrangement by making effective use of a V-space between the cylinders, and having an improved assembly performance and low manufacturing cost. In the V-type 2-cylinder engine having a V-space between two cylinders, there are arranged fuel injectors disposed in the cylinders, respectively, and a common fuel pressure adjustor for adjusting the pressures of fuels to be fed to the fuel injectors. An injection fuel introduction portion of a fuel passage is formed in a throttle body forming a section of intake passages and having throttle valves. The fuel pressure adjustor is disposed in the injection fuel introduction portion.

Abstract: Provided a fuel injection industrial engine E capable of determining a fuel injection quantity and an injection timing by a simple structure. The engine E includes a fuel injector 6 for injecting a fuel into intake air; ignition coils 31 and 32 for activating ignition plugs by generating an ignition signal synchronized with the rotation of the engine E; and an injection control device 5 for controlling the injection quantity and the injection timing of the fuel injector 6 by determining the engine speed (or the rotating speed) and phase on the basis of an ignition current signal e extracted from a primary side of said ignition coils 31 and 32.

Abstract: A V-type 2-cylinder engine capable of distributing air-fuel mixtures equally to each cylinder, having a fuel injection device compact in its arrangement by making effective use of a V-space between the cylinders, and having an improved assembly performance and low manufacturing cost. In the V-type 2-cylinder engine having a V-space between two cylinders, there are arranged fuel injectors disposed in the cylinders, respectively, and a common fuel pressure adjustor for adjusting the pressures of fuels to be fed to the fuel injectors. An injection fuel introduction portion of a fuel passage is formed in a throttle body forming a section of intake passages and having throttle valves. The fuel pressure adjustor is disposed in the injection fuel introduction portion.

Abstract: A multiple cylinder engine controls an air/fuel ratio accurately by improved detection of the fluctuations in a vacuum due to a change in the openings of throttle valves. The multiple cylinder engine comprises: a plurality of intake passages 11a and 11b for feeding intake air to cylinders 2 and 3 independently of each other; fuel injectors 6 and 7 and throttle valves 4c provided for the intake passages; a pressure sensor C for detecting the pressure of one of the intake passages 11a and 11b; and fuel control means 20 for controlling the injection quality of the fuel injectors 6, 7 of each cylinder by using the detected pressure. The multiple cylinder engine may further comprise a vacuum inlet passage 18 having a inlet port 18a opened into intake passages 11a or 11b that introduces the pressure of the intake passages 11a or 11b into the pressure sensor C. The vacuum inlet passage 18 includes a throttle portion 18b preferably having a passage area of no more than one ninth that of the inlet port 18a.