Abstract: An intrusion detecting apparatus for a vehicle comprising an ultrasonic transmitting/receiving sensor, an intrusion detecting unit for detecting whether or not a person intrudes into a passenger compartment, based on the received signal, a stopping unit for intermittently stopping the transmission from the transmitter, and a cover detecting unit for detecting whether or not the sensor is covered, based on the signal received after stopping the transmission of the signal and, in response to a predetermined condition representing that the sensor is covered, whereby it can correctly determine whether or not the sensor is covered, improving the accuracy of the detection of an illegal intrusion of a person. At least one of a transmitter and a receiver in the sensor and the intrusion detecting unit is also intermittently operated to reduce the power consumption.

Abstract: Pickup coils which generate vehicle wheel speed signals which include vibration frequency components of tires during vehicle cruising are provided. An electronic control unit extracts resonance frequencies of tires from the vehicle wheel speed signals and estimates tire pneumatic pressure based on the extracted resonance frequencies. When an estimated vehicle wheel pneumatic pressure falls below a predetermined critical pneumatic pressure, pneumatic pressure decline warnings are generated and displayed by a display unit. An update switch is provided and when this update switch is turned on when replacing tires, the electronic control unit adjusts and sets the value of the critical pneumatic pressure described above based on the resonance frequency extracted during this time.

Abstract: Tire vibration frequency components of left-hand and right-hand tires are derived from wheel speed signals while a vehicle is traveling. A noise frequency component is detected based on a correlation between the vibration frequency components of the left-hand and right-hand tires, and the noise frequency component is reduced relative to the vibration frequency component. Thereafter, resonance frequencies of each tire are detected using the vibration frequency component from which the noise frequency component is reduced, and tire air pressures are detected on the basis of the resonance frequencies.

Abstract: A variable capacity type swash plate compressor has a shaft, a swash plate, pistons functionally connected with the swash plate, and a detector for detecting the reciprocating stroke of the piston. The reciprocating stroke of the piston is varied in accordance with an inclining angle of the swash plate in such a manner that a top dead point of the piston at a working chamber defined at one end of the piston is substantially constant. The detector detects the change of the width of the reciprocating stroke of the piston and calculating the capacity of the compressor. The detector employs a plurality of magnets provided on a center portion of the piston and an electromagnetic sensor provided on a cylinder block for facing to the magnets.

Abstract: An acceleration sensor for detecting an acceleration in a plane, and having a housing, and a disk magnet arranged in a magnetic fludi stored in the housing. The movement of disk magnet is limited, i.e., a translational movement or rotational movement thereof can occur only in the plane, by projections formed in the housing, between which projections portions of the magnetic fluid having an increased density are formed adjacent to the poles of the disk magnet so that only a translational movement is allowed, or by small circumferential walls between the housing and the disk magnet and radial projections formed between end walls of the housing and disk magnet so that only a rotational movement is allowed. A Hall element issues a signal corresponding to a position of the disk magnet, to thereby determine the acceleration rate.

Abstract: An acceleration sensor including a magnetic fluid, a permanent magnet emplaced movably in the magnetic fluid, a nonmagnetic case, in which case the magnetic fluid and the permanent magnet are sealed and from which case air is substantially excluded, the shape of internal receptacle of the case dominating the shape of the magnetic fluid, whereby the path of the magnetic flux generated by the permanent magnet is restricted and the permanent magnet in the magnetic fluid is given an automatic positioning function, a unit for detecting the position of the permanent magnet, and a processing circuit for processing signals from the detection unit.

Abstract: A rotary drive apparatus includes: a bar yoke, a coil mounted on the bar yoke, and a cylindrical case, having a magnetic property for receiving the coil and the bar yoke therein. The cylindrical case has at least one salient-pole portion formed on the inside thereof in the vicinity of a portion where the coil is received. The rotary drive apparatus also includes a rotary member facing the salient-pole portion and spaced from the bar yoke and the salient-pole portion by a predetermined gap, so that the rotary member rotates between the bar yoke and the salient-pole portion, and is provided with at least one magnet having opposite magnetic polarities and arranged along the circumference of the rotary member and facing the salient-pole portion. The salient-pole portion, the magnet, and an end-of-the-yoke member form a magnetic circuit. The rotary member is rotated in response to magnetic flux generated at the end of the bar yoke by applying an electric current to the coil.

Abstract: A motor speed controlling device comprises a rotating shaft connected to an axle and having rotation speed (set speed) varying with the passage of time, a motor with an output shaft connected to a pointer of a speedometer by means of an eddy-current coupling, rotation detectors generating pulse signals respectively proportional to the rotation speed in the rotating shaft and the output shaft and having the same frequency and the same pulse width at the same rotation speed, a logical operation circuit for discriminating the binary state of both pulse signals, and an integrating circuit which increases driving signal to the motor at a definite gradient when one pulse signal is in the 1 state and the other pulse signal is in the 0 state and decreases the driving signal at a definite gradient when one pulse signal is in the 0 state and other pulse signal is in the 1 state and holds the driving signal to the constant value when both pulse signals are at the same level.

Abstract: An electromagnetic position control apparatus including a rotary sphere having a permanent magnet. The rotary sphere is rotably supported within a spherical hole formed at a crossing portion of a cross-shaped yoke. Coils are used to create magnetic fields at the rotary sphere. The position of rotation of the rotary sphere is controlled in three dimensions by means of changing the intensity of the direct current supplied to the coils or the duty cycle of the pulse current supplied to the coils to change the intensity of the magnetic fields.

Abstract: A sequential polyamino acid resin having a remarkably high molecular weight and special amino acid sequence as repeating unit in the resin can be produced by conducting polycondensation of a peptide active ester acid salt in an aprotic polar solvent in the presence of a tertiary amine and phosphorus pentoxide.

Abstract: A solenoid valve for opening and closing a fluid passage is disclosed. It includes a valve member supported rotatably within a case and having alternately different magnetic poles formed on the outer periphery of one end thereof and also having a fluid passage formed in the other end thereof; an electromagnetic drive means for creating alternately different and invertible magnetic poles in an opposed relation to the magnetic poles of the valve member to rotate the valve member by a predetermined angle; and plural fluid passages formed within the case and adapted to be brought into communication with each other through the fluid passage of the valve member upon rotation of the valve member at said predetermined angle.

Abstract: This invention relates to a novel acylation process which comprises using as the acylating agent an o-hydroxy-substituted aromatic oxime ester represented by the general formula (I) ##STR1## and mixing said acylating agent with an amine substance represented by the general formula (III) ##STR2## to form a compound represented by the general formula (IV) ##STR3##

Abstract: A rotary drive apparatus including a frame having at least three holes; a yoke having a center portion and two side bar portions on opposite sides of the center portion, the center portion having a hole, coils mounted on the side bar portions of the yoke, a collar having a bore and being tightly mounted on the surface of the hole of the yoke, magnetic parameter changing elements being mounted on the surface of the bore of the collar, and a rotor having magnetic poles in the radial direction and being inserted into the bore of the collar with a predetermined clearance. In the apparatus, a first hole of the frame is parallel to a first direction of the apparatus and has a cross-section for tightly receiving the center portion of the yoke, and a second and third holes of the frame are in a second direction perpendicularly intersecting the first direction and being concentric with each other oppositely the first hole, the center portion of the yoke being fit into the first hole.

Abstract: A sequential polyamino acid resin having a remarkably high molecular weight and special amino acid sequence as repeating unit in the resin can be produced by conducting polycondensation of a dipeptide active ester acid salt in an aprotic polar solvent in the presence of a tertiary amine and phosphorus pentoxide.