Abstract: A plasma processing apparatus includes a balun having a first unbalanced terminal, a second unbalanced terminal, a first balanced terminal, and a second balanced terminal, a grounded vacuum container, a first electrode electrically connected to the first balanced terminal, a second electrode electrically connected to the second balanced terminal, an impedance matching circuit, a first power supply connected to the balun via the impedance matching circuit, and configured to supply a high frequency to the first electrode via the impedance matching circuit and the balun, a low-pass filter, and a second power supply configured to supply a voltage to the first electrode via the low-pass filter.

Abstract: A heating time period is decreased by that a valve body including a hollow valve shaft is arranged in a slidable manner in a cylindrical part of a casing on which a nozzle body with a valve seat is mounted at a front end thereof, a fuel is introduced from a fuel outlet port opening on a shaft wall of the valve shaft into a fuel path formed by the valve shaft and the cylindrical part, the fuel is heated to be injected from the nozzle body by a heater arranged at an outside of the fuel path of the cylindrical part, and a sleeve is mounted in the fuel path so that a large diameter part thereof closes the fuel path at an upper area of the fuel outlet port, while a fuel inlet port is formed on a small diameter part of the sleeve to introduce the fuel into the fuel path, so that the fuel path is narrowed to decrease an amount of the fuel to be heated by the heater.

Abstract: An oxygen sensor includes a sensor element, a holder having a hole through which the sensor element is arranged, a sealing positioning portion for sealing a clearance between the sensor element and the holder and positioning the sensor element in the holder and being filled with a ceramic powder, terminals arranged to be in contact with the sensor element and for taking an output from the sensor element, an insulator secured to the holder at a first end and for holding the terminals, a casing secured to the holder at the first end and for covering an outer periphery of the insulator, and a protector secured to the holder at a second end and for covering an outer periphery of a portion of the sensor element, the portion protruding from the second end of the holder.

Abstract: When an engine operation is stopped, a bypass passage returning fuel in a fuel supply passage into a fuel tank is opened to return a part of the fuel in the fuel supply passage, and a fuel pressure in the fuel supply passage is lowered to a predetermined fuel pressure higher than the atmospheric pressure, to be regulated.

Abstract: A heating time period is decreased by that a valve body including a hollow valve shaft is arranged in a slidable manner in a cylindrical part of a casing on which a nozzle body with a valve seat is mounted at a front end thereof, a fuel is introduced from a fuel outlet port opening on a shaft wall of the valve shaft into a fuel path formed by the valve shaft and the cylindrical part, the fuel is heated to be injected from the nozzle body by a heater arranged at an outside of the fuel path of the cylindrical part, and a sleeve is mounted in the fuel path so that a large diameter part thereof closes the fuel path at an upper area of the fuel outlet port, while a fuel inlet port is formed on a small diameter part of the sleeve to introduce the fuel into the fuel path, so that the fuel path is narrowed to decrease an amount of the fuel to be heated by the heater.

Abstract: An oxygen sensor includes a sensor element, a holder having a hole through which the sensor element is arranged, a sealing positioning portion for sealing a clearance between the sensor element and the holder and positioning the sensor element in the holder and being filled with a ceramic powder, terminals arranged to be in contact with the sensor element and for taking an output from the sensor element, an insulator secured to the holder at a first end and for holding the terminals, a casing secured to the holder at the first end and for covering an outer periphery of the insulator, and a protector secured to the holder at a second end and for covering an outer periphery of a portion of the sensor element, the portion protruding from the second end of the holder.

Abstract: When an engine operation is stopped, a bypass passage returning fuel in a fuel supply passage into a fuel tank is opened to return a part of the fuel in the fuel supply passage, and a fuel pressure in the fuel supply passage is lowered to a predetermined fuel pressure higher than the atmospheric pressure, to be regulated.

Abstract: A fuel injection valve includes a valve seat having a valve-seat portion on which a valve element is seated, and a nozzle plate disposed downstream from the valve seat and having a plurality of nozzle holes. A deformable member deforms with temperature to vary a space between the valve-seat portion of the valve seat and the nozzle plate, thus achieving change in spray characteristics.