摘要:
There is disclosed an oxygen sensor disposed before an exhaust gas purifying catalyst of an engine which uses a hydrocarbon containing fuel with a H/C ratio of three or more. An oxygen sensor 1 is provided with a solid electrolytic body 2 which can generate a difference in oxygen concentration with reference gas and measured gas, a reference electrode 3 and a detection electrode 4 formed on inner and outer surfaces of the solid electrolytic body 2, and a porous protective layer 5 for covering the detection electrode 4. The detection electrode 4 is formed only of a metal like Pt which promotes oxidizing reaction of methane to have a thickness of 1 to 2 &mgr;m. In the protective layer 5, only a second protective layer 5b carries Pt catalyst 6 which promotes oxidizing reaction of hydrogen, and the amount of carried catalyst is in the range of 0.5 to 7 mol % relative to the whole of the second protective layer 5b. According to the oxygen sensor 1, even if a large amount of hydrogen is exhausted, for example, from CNG engine, or even if a large amount of methane is exhausted, an excellent engine control can be realized.
摘要:
An oxygen sensor is disposed behind an exhaust gas purifying catalyst for an internal combustion engine and which suppresses the influence of unburnt hydrocarbon on the output voltage. A sensor element 1 is provided with a detection electrode 4 on the outer face of a zirconia ceramic body 2, a reference electrode 3 on the inner face of the ceramic body 2 and a spinel protective layer 5 on the outer surface of the detection electrode 4. The tip end of the sensor element 1 is covered with a protective cover 10 which is provided with an outer partition wall 11 having through holes 11a and an inner partition wall 12 having through holes 12a. In a case where the pressure difference between the inside and outside of the protective cover 10 is &Dgr;P(atm) when the atmospheric air with a volume flow rate Q(L/min) is passed into the protective cover 10 from the outside, the ratio &Dgr;P/Q2 is 3.2×10−5 (atm·min2·L−2). When the surface temperature of the sensor element 1 is changed in a range of sensor active temperature, the reversing time is substantially constant. Therefore, the catalyst deterioration can be detected by the oxygen sensor with high accuracy.
摘要:
An oxygen sensor is disposed downstream from a catalyst for purifying exhaust gas from an internal combustion engine and which can suppress an influence of unburnt hydrocarbon on an output voltage. After forming a platinum thin film on the outer periphery of a zirconia ceramic body, only a detection electrode of the ceramic body is dipped in a silver nitrate aqueous solution of 0.1 mol/l, and the silver nitrate is pyrolyzed through a heat treatment. Subsequently, a platinum reference electrode is formed on the inner periphery of the ceramic body. To protect the silver-doped detection electrode, a protective layer is formed on the surface of the detection electrode. By the exposure to combustion gas and through aging, a detection element is formed, and set into a metal case together with a cylindrical heater, to complete an oxygen sensor to be disposed downstream from a CNG engine catalyst.
摘要:
A metalized film capacitor includes a first dielectric film, a first metal thin-film electrode provided on a surface of the first dielectric film, a second dielectric film provided on the first metal thin-film electrode, and a second metal thin-film electrode provided on the second dielectric film, such that the second metal thin-film electrode faces the first metal thin-film electrode across the second dielectric film. The surface of the first dielectric film has a surface energy ranging from 25 mN/m to 40 mN/m. The metalized film capacitor exhibits high heat resistance and a preferable self-healing effect.
摘要:
A lubrication apparatus for a four-stroke engine (1) is provided that prevents lubrication failure from occurring around the crankshaft and reliably prevents oil from remaining in a valve operating chamber (30). The lubrication apparatus for the four-stroke engine (1) includes: an intake part (55) positioned below the level of an oil A in an oil reservoir (7) even if the oil reservoir (7) is tilted and the level of the oil A changes; an oil feeding passageway (54) that sucks up the oil A from the intake part (55) and supplies the oil A to the crank chamber (5a); and an direct passageway (47) that allows communication between a valve operating chamber (30) and a crank chamber (5a) when a negative pressure is created in the crank chamber (5a). Open end parts (47a, 54a) of the oil feeding passageway (54) and the direct passageway (47) which are open in the crank chamber (5a) are provided to open as the piston (13) moves from a position near the top dead center to the top dead center. It is possible to control the flow rate of oil supplied to the crank chamber (5a) via the oil supply passageway (54) by means of a flow rate control passageway (67) that allows communication between a supply passageway (51) to supply oil mist from the oil reservoir (7) to the valve operating chamber (30) and the oil feeding passageway (54).
摘要:
According to one embodiment, a lighting device includes a lighting circuit and a control circuit. The lighting circuit includes an output end to which an illumination lamp is connected, and lights the illumination lamp by a direct-current power. The control circuit controls the lighting circuit so that power consumption caused by a contact resistance at a connection part between the illumination lamp and the output end of the lighting circuit during whole light lighting of the illumination lamp does not exceed a specified value set to 8 W or less.
摘要:
According to one embodiment, a magnetic disk medium is pre-formatted on both the surfaces by magnetic transfer. Sectors with the same sector number on the front surface and the rear surface of the magnetic disk medium are arranged at positions shifted by a predetermined angle associated in advance with determination target information.
摘要:
A toner supply container according to this invention includes a toner containing portion, a support member and a container holding member. The toner containing portion is a cylindrical container having a magnet at an outer periphery thereof and configured to discharge fluid contained therein. The support member supports the toner containing portion for rotation. The container holding member has a counterpart magnet at a position opposed to the former magnet and is configured to hold the toner containing portion supported by the support member.
摘要:
In one embodiment, a DC power supply unit includes a DC power supply source; a load circuit connected to an output end of the DC power supply source; a load state detection device to detect a load voltage or an electric quantity corresponding to the load voltage; and a control device to receive the detected output of the load state detection device. The control device controls a maximum output voltage of the DC power supply source so that the voltage difference between the maximum output voltage of the DC power supply source and the load voltage at the time of normal operation falls within a predetermined range in which arc discharge is suppressed.
摘要:
In a sensor diagnosis process, a controller for controlling an NOx gas sensor performs processing of changing the oxygen partial pressure in a second measurement chamber by changing the oxygen partial pressure in a first measurement chamber (S190), processing of detecting a current flowing through a second pump cell before the change of the oxygen partial pressure (S180), and processing of detecting a current flowing through the second pump cell after the change of the oxygen partial pressure (S230). Furthermore, the controller performs processing of judging whether or not the ratio between the current values detected by the respective current detecting unit falls within an allowable range, judging that the second pump cell 113 is in a normal state if the ratio between the current values falls within the allowable range, and judging that the second pump cell 113 is in a deteriorated state if the ratio between the current values is out of the allowable range (S240 and S250).