Abstract: An injector diagnosis device 1 includes: an engine sound model generator 14 configured to generate a normal engine sound model and an abnormal engine sound model based on the number of cylinders of the engine and a combustion pattern of the engine; an operating sound obtainment unit 12 configured to obtain the operating sound of the engine operating with the combustion pattern; a frequency characteristics calculation unit 13 configured to calculate the frequency characteristics of the operating sound obtained by the operating sound obtainment unit 12; and an injector diagnosis unit 15 configured to diagnose whether or not the injectors have a failure based on the frequency characteristics of the operating sound which is calculated by the frequency characteristics calculation unit 13, and the normal engine sound model and the abnormal engine sound model which is generated by the engine sound model generator 14.

Abstract: An injector failure diagnostic device 1 diagnoses injector failures for a multi-cylinder internal combustion engine 2 having injectors 21 to 24, each injector injects fuel to the corresponding cylinder. The injector failure diagnostic device 1 includes: an operating sound obtainment unit 12 configured to obtain current operating sound that is operating sound when all of the injectors operate, and obtain pseudo-failure operating sound sequentially for each of the injectors, the pseudo-failure sound being operating sound generated by stopping the fuel injection from one injector while maintaining the operation of the remaining injectors; and a faulty injector identification unit 13 configured to determine whether or not the pseudo-failure operating sound of each injector obtained by the operating sound obtainment unit 12 is similar to the current operating sound to identify a faulty injector.

Abstract: An injector diagnosis device 1 includes: an engine sound model generator 14 configured to generate a normal engine sound model and an abnormal engine sound model based on the number of cylinders of the engine and a combustion pattern of the engine; an operating sound obtainment unit 12 configured to obtain the operating sound of the engine operating with the combustion pattern; a frequency characteristics calculation unit 13 configured to calculate the frequency characteristics of the operating sound obtained by the operating sound obtainment unit 12; and an injector diagnosis unit 15 configured to diagnose whether or not the injectors have a failure based on the frequency characteristics of the operating sound which is calculated by the frequency characteristics calculation unit 13, and the normal engine sound model and the abnormal engine sound model which is generated by the engine sound model generator 14.

Abstract: An injector failure diagnostic device 1 diagnoses injector failures for a multi-cylinder internal combustion engine 2 having injectors 21 to 24, each injector injects fuel to the corresponding cylinder. The injector failure diagnostic device 1 includes: an operating sound obtainment unit 12 configured to obtain current operating sound that is operating sound when all of the injectors operate, and obtain pseudo-failure operating sound sequentially for each of the injectors, the pseudo-failure sound being operating sound generated by stopping the fuel injection from one injector while maintaining the operation of the remaining injectors; and a faulty injector identification unit 13 configured to determine whether or not the pseudo-failure operating sound of each injector obtained by the operating sound obtainment unit 12 is similar to the current operating sound to identify a faulty injector.

Abstract: An air bypass valve device includes a case 3 and a valve assembly 5, a tenon 3l is provided to one of the case 3 and the valve assembly 5, and a tenon groove 8e is provided to the other, such that the case 3 and the valve assembly 5 are united by a tenon insertion structure.

Abstract: An air bypass valve device includes a case 3 and a valve assembly 5, a tenon 31 is provided to one of the case 3 and the valve assembly 5, and a tenon groove 8e is provided to the other, such that the case 3 and the valve assembly 5 are united by a tenon insertion structure.

Abstract: An exhaust-gas introducing passage is branched, on an outlet side of a valve, into parts, correspondingly to the number of an exhaust port of an internal combustion engine and the branching section is located at a position directly opposed to a movable valving element of the valve so as to cause exhaust gas to easily flow only in the direction of the outlet, which has introducing passages of exhaust gas communicating with a plurality of intake ports of the internal combustion engine to approach as near as possible a state in which each of the introducing passages is isolated from another introducing passages, and they assume an aspect just as if the introducing passages do not substantially communicate with one another.

Abstract: An exhaust-gas introducing passage is branched, on an outlet side of a valve, into parts, correspondingly to the number of an exhaust port of an internal combustion engine and the branching section is located at a position directly opposed to a movable valving element of the valve so as to cause exhaust gas to easily flow only in the direction of the outlet, which has introducing passages of exhaust gas communicating with a plurality of intake ports of the internal combustion engine to approach as near as possible a state in which each of the introducing passages is isolated from another introducing passages, and they assume an aspect just as if the introducing passages do not substantially communicate with one another.

Abstract: The invention relates to a mounting device for mounting an exhaust gas recirculation valve connected to an exhaust gas reflux passage of an engine. A valve housing is mounted on a cooling water circulating part from an engine block, as well as the valve housing forms a part of a cooling water passage. Therefore, an intense heat of the exhaust gas can be absorbed in and radiated by the cooling water. In this manner, an abnormal over heat of a stepping motor due to the intense heat of the exhaust gas is prevented without forming any cooling water passage around the valve housing.

Abstract: The invention relates to a mounting device for mounting an exhaust gas recirculation valve connected to an exhaust gas reflux passage of an engine. A valve housing is mounted on a cooling water circulating part from an engine block, as well as the valve housing forms a part of a cooling water passage. Therefore, an intense heat of the exhaust gas can be absorbed in and radiated by the cooling water. In this manner, an abnormal over heat of a stepping motor due to the intense heat of the exhaust gas is prevented without forming any cooling water passage around the valve housing.

Abstract: In the wall portion of a valve housing deposed in connection with an engine block, a cooling-water-taking-out passage that has a cooling water inlet port having an opening on the to-be-connected surface of the valve housing to an engine block, and that takes out the cooling water coming from a cooling water passage of the engine block is integrally formed, and thereby the cooling water inlet port is configured to be connected with the cooling water passage.

Abstract: The exhaust gas recirculation valve device of the present invention is provided with a motor main body 20 which drives a valve 8 by a valve rod 6 in direction of opening or closing, and a motor holder 21 which covers the lower opening of the motor main body 20. A circular groove 50 is formed on one of the upper section of the motor holder 21 and the lower opening of the motor main body 20 and a protrusion 60 which fits into the circular groove 50 is formed on the other of the upper section of the motor holder 21 and the lower opening of the motor main body 20. A liquid sealant layer 70 is disposed between upper face 61 which is the top of the protrusion and the lower face 50a which is the bottom of the circular groove 50 facing the upper face 61.

Abstract: An electrical flow control valve is provided which comprises a retention section for centering a ball retained between one end of a rotor and a surface facing the end. A boss is provided which projects from a motor housing towards a motor holder, is integrated with said motor housing, and retains a bearing in a fixed position. This arrangement allows the greater axial alignment accuracy of the rotor and the stator and greater axial alignment and simplification of the structure of the motor.

Abstract: In the wall portion of a valve housing deposed in connection with an engine block, a cooling-water-taking-out passage that has a cooling water inlet port having an opening on the to-be-connected surface of the valve housing to an engine block, and that takes out the cooling water coming from a cooling water passage of the engine block is integrally formed, and thereby the cooling water inlet port is configured to be connected with the cooling water passage.

Abstract: A motor shaft for a rotational-to-direct motion converting motor has a rotation stopping portion formed in a plate shape, and a screw portion formed in a columnar shape. In addition, the motor shaft has a hole, arranged in an end portion of the motor shaft in a longitudinal direction of the motor shaft, for positioning the motor shaft in a form rolling. Therefore, a position shift or a phase shift of thread ridges formed on the screw portion can be prevented.

Abstract: An exhaust gas recirculation valve device is provided with a motor shaft, a stepping motor main body driving the motor shaft, a valve shaft having a tip functioning as a proximal end which faces one end of the motor shaft and a distal end provided with a valve, a spring pushing the valve shaft in a closing direction, and a spring holder retaining the spring. In the case that the valve is cloned, the tip of the valve shaft and the spring holder are caulked together at a distance between the tip of the valve shaft and the one end of the motor shaft so that a distance between the facing ends of the motor shaft and the valve shaft is equivalent to a difference between a stroke of the motor shaft of the stepping motor main body and a stroke of the valve on opening.

Abstract: An electrical flow control valve is provided which comprises a retention section which has a function of centering a ball which should be retained between one end of a rotor and the opposing face of the end. A boss is provided which projects from a motor housing towards a motor holder, which is integrated with said motor housing and which retains a bearing in a fixed position. This arrangement allows the greater axial alignment accuracy of the rotor and the stator and greater axial alignment and simplification of the structure of the motor.

Abstract: An exhaust gas recirculation valve device is provided with a motor shaft, a stepping motor main body driving the motor shaft, a valve shaft having a tip functioning as a proximal end which faces one end of the motor shaft and a distal end provided with a valve, a spring pushing the valve shaft in a closing direction, and a spring holder retaining the spring. In the case that the valve is closed, the tip of the valve shaft and the spring holder are caulked together at a distance between the tip of the valve shaft and the one end of the motor shaft so that a distance between the facing ends of the motor shaft and the valve shaft is equivalent to a difference between a stroke of the motor shaft of the stepping motor main body and a stroke of the valve on opening.

Abstract: A flow control valve is provided with a spring which is compressed in the direction of closure of the valve which opens and closes the valve housing, a protruded part which projects towards the valve drive side into the indented part provided on the upper surface of the bracket mounted on the valve drive housing, a protective member projecting from the valve drive housing towards the bracket, and an aperture formed in the bracket so as to communicate the lower face of the bracket with the outside. As a result, a reduction in the adverse effects of heat from the valve housing and in the entry of foreign objects from outside is achieved.

Abstract: When a valve lift control signal is received from a control unit 10, two coils from amongst the coils 18a-18d in a step motor 18 are excited and an aperture of a valve 14 is regulated. When the aperture regulation of the valve 14 is completed and a fixed period of time elapses, the excitation mode of the step motor 18 is switched from 2-phase to 1-phase.