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Now showing items 1 - 16 of 41

  • ELECTRICALLY HEATED CATALYST

    This electrically heated catalyst keeps electricity from flowing in the case (5) of the electrically heated catalyst (1). To that effect, the case (5), which houses a heating element (3), is provided with a tubular portion (53) formed parallel to a central axis, an entrance portion (51) provided further upstream than the tubular portion (53) and having an inner diameter smaller than that of the tubular portion (53), an inclined portion (52) which connects the tubular portion (53) and the entrance portion (51), and an introduction portion (54) which extends to inside the case (5) from where the entrance portion (51) and the inclined portion (52) connect and which is curved such that the center of curvature is positioned outside of the case (5). An inner cylinder (4), which is held from both sides by a mat (6) supporting the heating element (3), is provided with a cylindrical portion (42) formed parallel to the central axis, and an inclined portion (41) which is provided further upstream than the cylindrical portion (42), has an inner diameter that becomes smaller in the upstream direction and is curved.
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  • ELECTRICALLY HEATED CATALYST

    The purpose of the present invention is to suppress flow of electricity in a case (5) for an electrically heated catalyst (1). This electrically heated catalyst (1) is provided with: a heating element (3) that generates heat by the flow of electricity; a case (5) that accommodates the heating element (3); an inner tube (4) that is provided between the heating element (3) and the case (5) and insulates electricity; an inside mat (62) provided between the heating element (3) and the inner tube (4); and an outside mat (64) provided between the inner tube (4) and the case (5). The inner tube (4) is provided with a tube shaped part (42) that is provided around the heating element (3) and formed parallel to the center axis (A) of the heating element (3) and a downstream side inclined part (43) that is provided on the downstream side of the tube shaped part (42) and in which the inside diameter becomes smaller toward the downstream side. A downstream side curved part (45), which is the boundary between the tube shaped part (42) and the downstream side inclined part (43), is provided in proximity to a downstream side end part (64A) of the outside mat (64).
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  • FAILURE DETECTION DEVICE FOR ELECTRICALLY HEATED CATALYST

    The purpose of the present invention is to detect an insulation failure in an electrically heated catalyst (EHC). In the present invention, a heating element of an EHC is electrically insulated by an insulating material. Moreover, the present invention determines whether or not an insulation failure has occurred on the basis of: an insulation resistance value of the insulating material when the amount of water absorbed by the insulating material is less than a prescribed amount of absorbed water, and the amount of particulate matter (PM) accumulated in the insulating material is less than a prescribed amount of accumulated PM; a change in the insulation resistance value of the insulating material when the amount of water absorbed by the insulating material has decreased from an amount greater than or equal to the prescribed amount of absorbed water to an amount less than the prescribed amount of absorbed water; and a change in the insulation resistance value of the insulating material when the amount of particulate matter (PM) accumulated in the insulating material has decreased from an amount greater than or equal to the prescribed amount of accumulated PM to an amount less than the prescribed amount of accumulated PM.
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  • ELECTRICALLY HEATED CATALYST

    The objective of the present invention is to suppress short circuiting between a case and a heat-releasing body in an electrically heated catalyst. The electrically heated catalyst (1) is provided with: a heat-releasing body (3); a case (4); an insulating support member (5) provided between the heat-releasing body (3) and the aforementioned case (4); an inner tube (6) sandwiched in the insulating support member (5) and of which the end is within exhaust gas from the end surface of the insulating support member (5); and a catalyst (10) having an oxidation ability and covering at least the outer peripheral surface of the protrusions (6a, 6b) of the inner tube (6) protruding within the exhaust gas from the end surface of the insulating support member (5), excepting a predetermined range contacting the end surface of the insulating support member (5).
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  • ELECTRICALLY HEATED CATALYST

    The present invention suppresses the flow of electricity to a case (5) of an electrically heated catalyst (1). The present invention is provided with: a heating body (3) that generates heat by current conduction; a case that accommodates the heating body (3); an inner pipe (4) that is provided between the heating body (3) and the case (5); a mat (6) that is disposed between the heating body (3) and the inner pipe (4), and between the inner pipe (4) and the case (5) to provide electrical insulation therebetween; and an electrode (7) that is connected to the heating body (3), and supplies electricity to the heating body (3). The inner pipe (4) projects more upstream and downstream in the exhaust flow direction than the mat (6), and the distance between the heating body (3) and an inner pipe (41) upstream of the electrode (7) is shorter than the distance between the heating body (3) and an inner pipe (42) downstream of the electrode (7).
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  • ELECTRIC HEATING CATALYST

    The purpose of the present invention is an electric heating catalyst (EHC) which improves the exhaust gas purification rate and suppresses damage to the heating element by optimal heat generation with a heating element. An electrode pair comprising surface electrodes (7a) extending along the outer circumferential surface of a heating element in the axial and circumferential directions of said heating element is provided such that said surface electrodes (7a) face one another across the heating element. Also, the surface electrodes (7a) are formed such that in the axial direction of the heating element the current between the surface electrodes (7a) flows in one portion mainly through the outer circumferential surface of the heating element and in the other portion flows mainly through the inside of the heating element.
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  • ELECTRIC HEATING CATALYST

    The purpose of the present invention is an electric heating catalyst (EHC) which improves the exhaust gas purification rate and suppresses damage to the heating element by optimal heat generation with a heating element. In this EHC is formed a pair of surface electrodes (7a) which extend spirally along the outer circumferential surface of a cylindrically formed heating element (3) from one end to the other end of said heating element (3) and which intersect one another across the heating element (3). Further, the width of the surface electrodes (7a) near the edge in contact with the circular perimeter of the end surface of the heating element (3) is expanded.
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  • ELECTRIC HEATING CATALYST

    The purpose of the present invention is to suppress the flow of electricity to a case (5) of an electric heating catalyst (1). This electric heating catalyst (1) is provided with a heating element (3) which generates heat when current is applied, a case (5) accommodating the heating element (3), an inner tube (4) provided between the heating element (3) and the case (5), electrically insulting mats (6) provided between the heating element (3) and the inner tube (4) and between the inner tube (4) and the case (5), and an electrode (7) connected to the heating element (3) and supplying power to said heating element (3), wherein an electrically insulating insulation layer (41) is formed on the surface of the inner tube (4), and said insulation layer (41) is formed such that the inner circumferential surface side (403) of the inner tube is thinner than the outer circumferential surface side (402).
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  • ABNORMALITY DETECTION DEVICE FOR ELECTRICALLY HEATED CATALYST

    In order to detect abnormalities in an electrically heated catalyst more accurately, this abnormality detection device for the electrically heated catalyst is provided with: a heating element that is disposed in an exhaust passage of an internal combustion engine, and generates heat by being energized; and an insulating part that insulates in such a manner that electricity does not flow to the discharge passage when the heating element has been energized. The abnormality detection device for the electrically heated catalyst is further provided with an assessment unit that determines that there is an abnormality in the electrically heated catalyst if the heating element is being energized before the internal combustion engine starts, and if an insulation resistance value of the insulating part is less than or equal to a threshold value after a predetermined period has elapsed from when the internal combustion engine starts.
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  • EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE

    Disclosed is an exhaust emission control device for internal combustion engines, which is provided with an electrically heated catalyst that is equipped with a catalyst support — for supporting the catalyst — and a support holding unit. The support holding unit, which holds the catalyst support and has electrically insulative properties, is provided around the periphery of the catalyst support. The device is also provided with a cooling means for cooling the support holding unit. As a result, it is possible to prevent a temperature increase of the support holding unit and to appropriately ensure the insulative performance of the electrically heated catalyst. Thus, it is possible to expand the condition range in which application of an electric current to an electrically heated catalyst is possible.
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  • EXHAUST GAS PURIFICATION DEVICE FOR INTERNAL COMBUSTION ENGINE

    An electric heating type exhaust gas purification device disposed in the exhaust system of an internal combustion engine is configured in such a manner that condensed water is not retained in the vicinities of electrode terminals. An exhaust gas purification device for an internal combustion engine is provided with: a catalyst carrier provided with electrodes; a case for containing the catalyst carrier; a mat member disposed between the catalyst carrier and the case; space sections leading from the catalyst carrier to the case, penetrating through the mat member; and electrode terminals contained within the space sections and supplying electric power to the electrodes of the catalyst carrier. The exhaust gas purification device is also provided with a pressure supply section for supplying positive pressure to the space sections. The pressure supply section prevents exhaust gas and condensed water from entering the space sections through the mat member and the catalyst carrier.
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  • ELECTRICALLY HEATED CATALYST

    The purpose of the present invention is to suppress short-circuiting between an electrode and a case of an electrically heated catalyst (EHC). In the EHC of the present invention, an electrode (7) is connected to a heat generating body (3) via a through-hole formed in a case (4) and an electrode chamber (9) formed between the inner wall surface of the case (4) and the outer peripheral surface of the heat generating body (3). A support member (8), which is formed from an electrical insulation material and supports the electrode (7) in the through-hole formed in the case (4), extends along the electrode (7) up to the interior of the electrode chamber (9).
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  • ELECTRICALLY HEATED CATALYST

    In the present invention the flow of electricity to a case (4) of an electrically heated catalyst (1) is inhibited. The electrically heated catalyst comprises a heat generator (2), the case (4), an inner pipe (3) that is provided between the heat generator (2) and the case (4) and that insulates against electricity, inner side mats (51, 52) that are provided in a compressed state between the heat generator (2) and the inner pipe (3) and are shorter than the inner pipe in the exhaust flow direction, and outer side mats (53, 54) that are provided in a compressed state between the inner pipe (3) and the case (4) and are shorter than the inner pipe (3) in the exhaust flow direction. The load per unit area that acts on the inner pipe (3) at the contact surface between the inner pipe (3) and the outer mats (53, 54) is made greater than the load per unit area that acts on the heat generator (2) at the contact surface between the inner mats (51, 52) and the heat generator (2).
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  • FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINE

    Provided is a fuel injection device for an internal combustion engine, wherein in the internal combustion engine using mixed fuel of gasoline and alcohol, emission deterioration when the mixed fuel is used can be suppressed by a simple configuration. The fuel injection device for the internal combustion engine comprises a fuel injector (26) having a front end portion (261) in which an internal space (263) for storing fuel and an injection port (262) for injecting the fuel are formed, and an adsorbent (58) which is installed in the internal space (263) and is capable of selectively adsorbing an alcohol component in the mixed fuel of gasoline and alcohol. In said fuel injection device, it is determined whether or not the fuel pressure is higher than a predetermined low fuel pressure when a request to stop the internal combustion engine (10) is made. When it is determined that the fuel pressure is higher than the low fuel pressure, the fuel pressure is controlled at the low fuel pressure for a predetermined time, and thereafter the internal combustion engine (10) is stopped. The predetermined time is preferably set to the time required to perform fuel injection one or more times in each of cylinders of the internal combustion engine (10).
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  • ELECTRIC HEATING CATALYST

    The purpose of the present invention is to prevent the decrease in the insulation resistance between an electrode and a case which is usually caused by the action of condensed water in an electric heating catalyst (EHC). This EHC (1) comprises a heating element (3) which can generate heat upon the conduction of an electric power to heat a catalyst, a case (4) which accommodates the heating element, and an insulating member (5) which is arranged between the heating element (3) and the case (4) and insulates an electric power. In the case (4) of the EHC (1), an electrode chamber (9), which is a space formed around an electrode (7) that is connected to the heating element (3), is closed by a closing member (10) which has higher air-tightness than those of the heating element (3) and the insulating member (5).
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  • DEVICE FOR DETECTING MALFUNCTION IN ELECTRICALLY HEATED CATALYST

    The objective of the present invention is to detect whether an electrically heated catalyst is normal by accurately detecting whether the temperature of the electrically heated catalyst has increased. Therefore, the detection device of the present invention is equipped with: an air-fuel ratio control device (10) that makes the air-fuel ratio rich for the exhaust air flowing into an electrically heated catalyst (4) when an internal combustion engine (1) starts up; a downstream-side detection device (6) provided downstream from the electrically heated catalyst (4) to detect the oxygen concentration in the exhaust air; and a determination device (10) that, when the air-fuel ratio of the exhaust air has been made rich by the air-fuel ratio control device (10) after the internal combustion engine (1) has started, determines whether current is flowing to the electrically heated catalyst (4) on the basis of the time at which the oxygen concentration detected by the downstream-side detection device (6) changes to a value indicating a rich air-fuel ratio.
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