Abstract: There is provided a method of controlling an engine system comprising an internal combustion engine, a supercharging system having at least one supercharger to boost intake air to the internal combustion engine, a turbine, and a motor. The turbine receives an exhaust gas flow through flow restriction and is capable of at least partly driving the supercharging system. The motor is capable of at least partly driving the supercharging system. The method comprises reducing the flow restriction and increasing power to drive the motor as a desired intake airflow of the engine increases. By reducing the flow restriction, such as increasing nozzle opening of a variable geometry turbine (VGT), as desired intake airflow of the engine increases, such as when the engine speed increases, an excessively high pressure in the exhaust passage may be prevented.

Abstract: There is provided a method for controlling an electrically driven supercharger of an internal combustion engine. The method comprises operating the supercharger at a first speed during a first engine operating condition. The method further comprises operating the supercharger at a second speed during a second engine operating condition, the second speed being lower than the first speed and increasing as the capacity of the electric power source decreases. According to the method, during a transition from the second engine operating condition to the first engine operating condition, the speed of the supercharger is increased from the second speed to the first speed. At that time, the second speed is increased as the capacity of the electric power source decreases, and as a result, the supercharger speed increase that results from the transition may become smaller.

Abstract: A novel mounting for a supercharger in a V-type engine is provided such that the supercharger is mounted in a space between the cylinder banks of a V-type engine. The mounting structure of the intake manifold suspends the supercharger, and the lower portion of the supercharger positions the supercharger with respect to the engine block.

Abstract: A drive system for driving an engine auxiliary equipment has a first power transfer device for transferring an output torque of the crankshaft to an interim shaft at all time and a second power transfer device comprising a crank pulley mounted for relative rotation on the crankshaft, an interim pulley mounted for relative rotation on the interim shaft and an input pulley related to the auxiliary equipment all of which pulleys are operationally coupled by a belt so as to transfer an output torque of the crankshaft to the auxiliary equipment. A first clutch is disposed between the crankshaft and crank pulley so as to connect and disconnect a transfer of power between the crankshaft and crank pulley. A second clutch is disposed between the interim shaft and interim pulley so as to connect and disconnect a transfer of power between the interim shaft and interim pulley.

Abstract: The supercharged internal combustion engine is so adapted as to set the air-fuel ratio to become a lean air-fuel ratio which is leaner than stoichiometric and lean enough to maximize improvements in a rate of consumption of fuel, for example, to the A/F ratio of 16, when the supercharger exists in such a supercharging region as demonstrating its sufficient degree of supercharging capability. When the air-fuel ratio is made lean in the supercharging region, exhaust gases are recirculated into the intake system of the engine, in addition to a mixed fuel. Preferably, the exhaust gases having lower temperatures are recirculated at the time of a high load of the engine in the supercharging region, while the exhaust gases having higher temperatures are recirculated at the time of a low load of the engine therein.

Abstract: An apparatus for driving devices which are operated by, or "supplementary" to, a V-type internal combustion engine, having a crankshaft and overhead camshafts, includes a camshaft drive mechanism for rotatably connecting the camshafts to the crankshaft so that the camshafts are "timely" driven. A supplementary device drive mechanism rotatably connects supplementary devices independently of the overhead camshafts to the crankshaft. The crankshaft is provided with a transmission gear train for transmitting rotation of the camshafts to the camshaft drive mechanism and the supplementary device drive mechanism.

Abstract: The support structure for cam shafts including an intake cam shaft and an exhaust cam shaft, a pair of intake cams per a cylinder formed side by side on the intake cam shaft, a pair of exhaust cams per a cylinder formed side by side on the exhaust cam shaft and having longer interval therebetween than that of the intake cams, a cam cap forming an upper portion of the support structure for the cam shafts and an upper wall portion of a plug hole for inserting the ignition plug, a cam carrier forming a lower portion of the support structure for the cam shafts and a lower wall portion of the plug hole, and fasteners for fastening the cam cap to an engine block. The fasteners are disposed both at longitudinally opposite sides of the pair of intake cams and between the pair of the exhaust cams.

Abstract: An engine with a row of cylinders is provided with two intake ports and intake valves and two exhaust ports and exhaust valves for each cylinder. The intake ports are arranged on one side of a center line of the row of cylinders, adjacent to each other, and side by side in a direction parallel to the cylinder row. The exhaust ports are arranged on another side of the center line, adjacent to each other, and side by side in the direction parallel to the cylinder row so that their centers are located at a distance apart which is larger than a distance at which centers of the intake ports are separated. The cylinder is formed with a "squish" surface between the exhaust ports which provides a squish area between the cylinder head and piston. This produces a squish or compressed flow of the air-fuel mixture to the exhaust ports in the combustion chamber.

Abstract: An exhaust gas recirculation system of an engine equipped with a supercharger has an exhaust gas circulation passage for circulating exhaust gas into an intake system from an exhaust system, and a return passage for returning exhaust gas introduced into the exhaust gas circulation passage to the exhaust system. The exhaust gas circulation passage is made available to the exhaust gas when the engine operates within a specified area of engine operating conditions in which supercharging is to be effected. The return passage is made available to the exhaust gas when the engine operates within an area, other than the specified area, of engine operating conditions.

Abstract: Disclosed is an exhaust gas recirculation system for an engine having a high compression ratio or with a supercharger. An outside EGR duct connecting the exhaust system to the intake system is provided with a first control valve, which has a second outside EGR duct bypassing the first control valve. The second EGR duct has a second EGR control valve and a cooler. When the engine exists in an extremely low load state, the first and second control valves are closed to inhibit the outside EGR. In the light load state, the first control valve is opened while the second control valve is closed, thereby allowing recirculation of the EGR gases having high temperature and reducing the pumping loss.

Abstract: In a V-type engine with two bore-offset banks opposed to one another at a predetermined angle, an accessory mechanism is provided between the two banks. A drive belt for the accessory mechanism is disposed on the side of one of the banks which is recessed inwardly due to the bore offset. In another embodiment, the accessory mechanism is a supercharger driven by a balancing shaft which, in turn, is driven by the crank shaft. In yet another embodiment, the V-type engine has a separate timing belt for each bank, that is, a first timing belt for the bank which is recessed inward because of the bore offset, and a second timing belt for the bank which juts out because of the bore offset. A drive belt is provided for driving the supercharger. The belts are arranged in the following order from the inside outward: the second timing belt, the first timing belt and the accessory belt.

Abstract: An intake manifold for a multi cylinder internal combustion engine has a common upstream passage and individual downstream passages, leading individually to cylinders of the engine, respectively. These individual downstream passages are connected between a downstream end of the common upstream passage and the cylinders. Upstream end portions of the individual downstream passages are symmetrically located around a fuel injector, disposed downstream relative to the common upstream passage, and are joined together. At a center of the symmetrically joined upstream end portions of the individual downstream passages, fuel passages are provided to open independently into the upstream end portions so as to introduce fuel from the fuel injector into the individual downstream passages.

Abstract: Discrete intake passages communicating with respective cylinders of a multiple-cylinder in-line engine are merged into an integrated chamber at their upstream ends. The integrated chamber is disposed above the engine and extends substantially horizontally. Each discrete intake passage extends from the engine body, bends upward toward the integrated chamber and is connected to the downstream side end face of the integrated chamber. The discrete intake passages for the cylinders which are positioned relatively near to the integrated chamber are connected to the downstream side end face of the integrated chamber at an upper portion of the end face and the discrete intake passages for the cylinders which are positioned relatively far from the integrated chamber are connected to the downstream side end face of the integrated chamber at a lower portion of the end face.

Abstract: An intake system is incorporated in a multi-cylinder internal combustion engine having a plurality of cylinders. The intake system includes an intake manifold having a plurality of discrete intake passages connected to the plurality of cylinders, respectively, and two intake pipes, each intake pipe being arranged in such a way as to descend substantially vertically downwardly from a communicating portion where the intake pipe communicates with each of two groups of the intake passages, turns to extend horizontally in one longitudinal direction of the engine body and then turns back to extend in the opposite longitudinal direction of the engine body surrounding the discrete intake passages. The two groups of the discrete intake passages are connected to two groups of the cylinders which in each and the same group are not intended to be fired one after another.