Abstract: A resolver reference position adjustment method is capable of minimizing a detection error in the rotation angle of a rotor of a motor. In the resolver reference position adjustment method in which a reference position of a resolver of an axial double angle n mounted on an end of a shaft, to which the rotor of the motor is fixedly attached, for detecting rotation angles of the rotor is adjusted with respect to the rotor, the reference position of the resolver is adjusted by using the rotation angles of the rotor at a first point and at a second point, respectively, which are positions of the rotor apart an angle of (mechanical angle 180/axial double angle n) degrees from each other.

Abstract: A transmission circuit transmits a command to a contactless IC card. A receiving circuit receives a transmission signal from the IC card and an amplifying circuit in the receiving circuit amplifies the reception signal. An impedance element to which the reception signal is applied is provided at a preliminary stage of the amplifying circuit. The impedance element is controlled so that the impedance thereof is lowered, and an input signal to be input into the amplifying circuit is muted.

Abstract: A resolver reference position adjustment method is capable of minimizing a detection error in the rotation angle of a rotor of a motor. In the resolver reference position adjustment method in which a reference position of a resolver of an axial double angle n mounted on an end of a shaft, to which the rotor of the motor is fixedly attached, for detecting rotation angles of the rotor is adjusted with respect to the rotor, the reference position of the resolver is adjusted by using the rotation angles of the rotor at a first point and at a second point, respectively, which are positions of the rotor apart an angle of (mechanical angle 180/axial double angle n) degrees from each other.

Abstract: A resolver can make accurate angle detection in an entire detection range. The resolver includes a resolver stator having an excitation winding of one phase adapted to be excited by a power supply and a first and a second output winding of two phases for outputting a change in the density of magnetic flux as a voltage, a resolver rotor arranged at a central portion of the resolver stator so as to cooperate with the resolver stator for changing a gap permeance between the resolver rotor and the resolver stator in accordance with the rotation of the resolver rotor, and a detection error correction part that corrects an angle detection error of the resolver by using the value of a Lissajous radius of a circular Lissajous waveform obtained from the amplitudes of an output signal Scos from the first output winding and an output signal Ssin from the second output winding.

Abstract: A transmission circuit transmits a command to a contactless IC card. A receiving circuit receives a transmission signal from the IC card and an amplifying circuit in the receiving circuit amplifies the reception signal. An impedance element to which the reception signal is applied is provided at a preliminary stage of the amplifying circuit. The impedance element is controlled so that the impedance thereof is lowered, and an input signal to be input into the amplifying circuit is muted.

Abstract: To obtain a pressure detection apparatus capable of changing output characteristics in a large area and changing a received pressure range without largely changing the apparatus in design.

Abstract: An acceleration sensor including: a fixed substrate; a fixed electrode mounted on the fixed substrate; a movable body, supported by the fixed substrate and displaced in response to an applied acceleration; a movable electrode which is arranged in the movable body in such a manner that the movable electrode faces the fixed electrode to form, together with the fixed electrode, a capacitor; wherein the movable electrode is mounted between grooves formed in the movable body. The acceleration sensor features improved mechanical strength, compact design and improved sensing accuracy while permitting the manufacturing process to be simplified.

Abstract: A compact pressure detecting apparatus comprising a pressure sensor unit, having a semiconductor pressure-detecting device provided with gauge resistance, integrated with a solenoid valve unit for controlling a channel of a measurement fluid into the body of the apparatus. The semiconductor pressure-detecting device partitioned a sensor vessel into a reference pressure chamber and a measurement fluid introduction chamber the measurement fluid introduction chamber can communicate with an environment outside of the pressure sensor unit the pressure-detecting device has a base with a through-hole, on which an electronic circuit and the pressure sensor are mounted.

Abstract: In a pressure sensing device for a fuel tank, a mounting member for mounting a fuel pump is provided with a pressure detecting opening. A base member is fixed to the mounting member through a seal member. A pressure sensor is mounted on the base member. Accordingly, the installation to the fuel tank can be facilitated and the number of parts can be decreased, thereby increasing production efficiency.

Abstract: A pressure sensor for detecting engine knocking includes a diaphragm 40, and a pressure transmitting medium 10 filled between a pressure sensing element 5 and the diaphragm. The diaphragm has a diameter d and a plate thickness t for enabling the diaphragm to have a resonant frequency substantially equal to the frequency of an abnormal pressure vibration; the diameter d and the plate thickness t satisfy the formula t=Kd.sup.2, where K=3.3.times.10.sup.4 .about.5.3.times.10.sup.4.

Abstract: A pressure sensor comprising a pressure sensing assembly 24 and a pressrue transmitting medium 26 disposed within a main body 20 a seal assembly 34,35,36 disposed between the pressure sensing assembly and the main body for sealing between them against said pressure transmitting medium while allowing an easy attachment and detachment of the pressure sensing assembly relative to the main body. The pressure sensing assembly may comprise a sensing element 27 for detecting pressure, a base plate 25 for sealingly supporting the pressure sensing element within the main body and a pressure transmitting pipe 26 for transmitting the pressure to be detected to the element, and an O-ring in contact with the pressure transmitting pipe. A filling passage 15 which may be closed by a plug screw 16 may be disposed in the main body for filling the detection cavity with the pressure transmitting medium.

Abstract: A pressure sensor comprising a hollow main body (11) defining a bore (14) extending therethrough and having a detection end and an output end. A pressure sensing assembly is disposed within said bore (14) to divide it into a detection cavity (17) and an output cavity (18) through which output signal lines from said pressure sensing assembly extend. A flexible diaphragm (19) is attached to the detection end of the bore to define a sealed detection cavity (17) in which a pressure transmitting liquid is filled. The pressure sensing assembly comprises support plate (24) welded to said main body (11) and supporting a pressure sensing element (26) within said detection cavity (17) through a mounting bed (4). The signal lines sealingly extend through said support plate (24) from said detection cavity (17) to said output cavity (18).

Abstract: A pressure sensor comprising a case, a diaphragm provided within the case, a pressure detecting part provided within the case for detecting pressure applied to the diaphragm, and a pressure transmission chamber formed between the diaphragm and the pressure detecting part for sealingly accommodating therein liquid through which the pressure is transmitted from the diaphragm to the pressure detecting part. The pressure transmission chamber is arranged to cope with the volume changes of the liquid due to the temperature changes thereof.

Abstract: A distributor cap comprises an ignition cable having a core wire exposed at one end thereof, a terminal member secured to the end portion of the ignition cable such that the terminal member is in contact with the core wire, a primary mold of a melt- adhesive resin material which is formed such as to cover that end portion of the ignition cable to which the terminal member is secured, and a synthetic resin cap body which is cast such as to wrap the primary mold. Formation of the primary mold enables the ignition cable and the terminal member to be reliably connected together in one unit and also makes it possible to secure the electrical connection between the core wire of the ignition cable and the terminal member. The primary mold is softened and fusion-welded to the cap body by heating applied during the cap body molding process.

Abstract: An ignition distributor for an internal combustion engine has a magnetic-permeable flat plate fixed to the rotating shaft of the ignition distributor so as to extend in the direction perpendicular to the shaft, and a sensor having forked sensing parts which are extended inside the housing so as to adjoin a part of the flat plate.

Abstract: A method of and apparatus for generating a cylinder discriminating signal in a distributor for an internal combustion engine are disclosed. The cylinder discriminating signal is generated by a combination of a cylinder discriminating reluctor installed on a centrifugal spark advance member and a cylinder discriminating sensor attached to a vacuum spark advance plate to detect approach and passage of the cylinder discriminating reluctor. The width of the cylinder discriminating reluctor in the direction of rotation is set so as to correspond to an angle smaller than the entire range of spark advance of the ignition timing signal. The cylinder discriminating signal is advanced by both centrifugal spark advance and vacuum spark advance so as to overlap the ignition timing signal despite having a relatively narrow width. Since the width of the cylinder discriminating signal is reduced, it is possible to improve the control tolerances of the associated microcomputer.

Abstract: A housing structure of a distributor for an internal combustion engine including an ignition coil is disclosed. The housing structure comprises a cup-shaped base accommodating the ignition coil and a cap fitted thereon and accommodating a distributor rotor. A cap-shaped partitioning cover is disposed between the base and the cap to separate the distributor rotor portion therefrom. The high output voltage of the ignition coil is supplied to the distributor rotor through a hollow cylindrical tower fixed to the ignition coil and an insertion electrode which is integral with the cap and fits into the hollow cylindrical tower. The cover has a cap-shaped side extension having a annular disk-shaped top which passes through the insertion electrode.

Abstract: An ignition timing signal generating rotor adapted to be operatively coupled to the shaft of a distributor for an internal combustion engine is disclosed wherein the rotor generates an ignition timing signal in cooperation with an ignition timing sensor operatively coupled to the housing of the distributor. The rotor comprises a reluctance varying rotor portion of a magnetic material and a tube of a non-magnetic material carrying the magnetic rotor portion. The magnetic rotor portion and the non-magnetic tube are made of formed powder materials which are simultaneously sintered together into a single piece.

Abstract: A distributor for an internal combustion engine includes an ignition timing reluctor provided on a centrifugal spark advance member, ignition timing signal generating means for generating an ignition timing signal by detecting approach and passage of the ignition timing reluctor, a cylinder discriminating reluctor provided on the centrifugal spark advance member, and a cylinder discriminating sensor for generating a cylinder discriminating signal by detecting approach and passage of the cylinder discriminating reluctor. The distributor has a structure for compensating for any imbalance of its rotator. The cylinder discriminating signal is centrifugally advanced in the same way as the ignition timing signal, so that it is possible to reduce the width of the cylinder discriminating signal.