Aisin Seiki Kabushiki Kaisha

Denso Corporation

Manabu Kato

Eiji Fujioka

Hideya Kurachi

Akira Kamiya

Katsuyoshi Shirai

Kazuyoshi Mori

Eiichiro Iwase

Ken Okumura

Noriaki Fujita

Akihiro Yasui

Toshihiro Sakata

A lead line routing structure includes: a lead line having an elliptical section; a bracket having a routing surface; and a guide portion. The guide portion includes a holding wall portion having a first principal surface and a second principal surface. The holding wall portion is provided with: a lead-out hole for leading a lead line to the second principal surface; and a slit extending from an end of the holding wall portion to the lead-out hole. The width of the slit is set to be larger than the minor axis of the lead line and smaller than the major axis thereof.

Sensor attachment bracket and lead line routing structure

A displacement sensor includes: an first yoke that is formed of a soft magnetic body and is annular-shaped; an second yoke that is formed of a soft magnetic body and is annular-shaped, the second yoke having an inner circumferential surface which faces an outer circumferential surface of the first yoke via a gap and arranged coaxially with the first yoke; a magnet that is arranged to be capable of moving in an axial direction in a radial-direction central portion of the first yoke and is magnetized in the axial direction of the first yoke; and a detection element that detects a magnetic flux density which is generated in the gap and is arranged in the gap so that the magnetic flux density is detected along the radial direction of the first yoke.

Displacement sensor

A current source circuit flowing an output current to at least one detection element including a first terminal to which a first voltage is supplied and a second terminal being connected to the current source circuit includes a reference resistance, a current mirror circuit including at least one first transistor and at least one second transistor, and a control circuit controlling a voltage of a common wire that is connected to a terminal provided at the first transistor and a terminal provided at the second transistor such that a voltage of a terminal provided at the reference resistance comes to be equal to a reference voltage.

Current source circuit and detection circuit

A current sensor includes a core including groove portions and a separation wall portion, a housing covering the core and including recessed grooves formed along the groove portions, respectively, conductors positioned in the groove portions, respectively, a circuit board fixed to the housing and including a through hole and a land, the through hole penetrating in a direction corresponding to an inserting direction of the conductor, a detection element detecting a magnitude of a magnetic field and positioned in each of recessed grooves to be closer to an opening end of the groove portion relative to the conductor, the detection element being arranged so that a detecting direction of the detection element is directed along a distance direction of the groove portions, the detection element including a connection terminal positioned in the through hole, the connection terminal electrically connected to the land, and a guide portion provided at the housing.

Current sensor

A current sensor includes at least three bus bars made of flat-plate-shaped conductors and an inverter, a plurality of cores in which a core is formed by stacking flat plates made of U-shaped magnetic bodies, and a detecting element arranged on the side of an opening portion of each of the cores for detecting the intensity of a magnetic field. An interval between the core and another bus bar that is adjacent to the bus bar inserted into the U groove of the core is &#xbd; of the length of the opening portion in the spacing direction, and the tolerance of the gap is set to a value obtained by subtracting the value of 3/2 of the length of the opening portion in the spacing direction from the value of the interval between the bus bars that are adjacent to each other, with the gap as a median value.

A communication system for a vehicle includes a portable identification device including a portion for receiving an interrogation signal and a portion for transmitting an indication indicative signal responsive to the interrogation signal, multiple tire sensor devices each of which includes a portion for receiving an initiation signal and a portion for transmitting a condition indicative signal responsive to the initiation signal, multiple transmitting devices each of which emits the interrogation signal and the initiation signal for different conditions within a communication area, a receiving device for receiving the indication indicative signal and the condition indicative signal, and a central controller for unlocking a door lock device when the portable identification device is determined to be in an overlapped area based on a condition of the portable identification device, the overlapped area being defined between two adjacent communication areas and in which the door lock device is involved.

Communication system for vehicle

A capacitance detecting apparatus includes: a first on/off switch; a first reference capacitor; a second on/off switch; a third on/off switch; a first sensor electrode; a fourth on/off switch; a second reference capacitance; a fifth on/off switch; a sixth on/off switch; a second sensor electrode; a comparator; switch controlling means for alternately repeating a second switch operation and a third switch operation following a first switch operation; counting means for counting a number of times for repeating the second switch operation; and judging means for judging changes in capacitances related to the first and second sensor electrodes, based upon the number of times for repeating the second switch operation counted by the counting means before a level of voltage at the first input terminal and a level of voltage at the second input terminal are reversed.

Capacitance detecting apparatus including first and second variable capacitors which vary with the distance to an object

A tire pressure monitoring system includes tire-based transmitting and receiving devices and a vehicle body-based transmitting and receiving device having vehicle body-based receiving means, vehicle body-based transmitting means, wherein (2&#x2212;1)&#xd7;(2&#x2212;1)&#x2267;t is satisfied with t, m and n representing the number of the tire-based transmitting and receiving devices, the number of vehicle body-based transmitting groups and the number of vehicle body-based receiving groups respectively, each tire-based transmitting and receiving device receives the transmission request from any one of the vehicle body-based transmitting groups, the information transmitted from the tire-based transmitting and receiving device is received by any one of the vehicle body-based receiving groups, and each tire-based transmitting and receiving device has a different combination of the groups of the vehicle body-based transmitting means and the vehicle body-based receiving means.

Tire pressure monitoring system

A rotation sensor for outputting a pulse signal, which has a frequency corresponding to a rotation speed of a rotor, to a wire. The rotation sensor includes a modulation unit and an output unit. The modulation unit modulates an information signal representing information other than the rotation speed into a carrier wave having a frequency higher than the frequency of the pulse signal. The output unit superimposes and outputs to the wire the pulse signal and the carrier wave. Accordingly, the rotation sensor performs stable information transmission that is not dependent on the rotation speed of the rotor.

Rotation sensor, and method for outputting signals from rotation sensor

A receiving antenna RA of a receiving unit RU is positioned at an inner diameter side of a rotation locus of a transmitting unit TU when a tire T rotates. Consequently, it shortens a reaching distance of electromagnetic waves and lessens its change, thereby making it easy to keep a stable receiving sensitivity state. Moreover, the receiving antenna RA is made of a wire of a predetermined length that is made integral inside a wire harness WH connected to the receiving unit RU. Consequently, it becomes easy to make the receiving antenna RA in a length of &#x3bb;/4 of a wavelength &#x3bb; of the electromagnetic waves in use, a length of an integral multiple thereof, or &#x215d;&#x3bb;. As a result, the receiving sensitivity can be improved.

Tire information communication device

A tire inflation pressure detection apparatus includes a detection portion provided in a tire of a vehicle for detecting a tire inflation pressure, a transmitting portion for wirelessly transmitting a signal of a tire inflation pressure information, a receiving portion for feeding the signal transmitted from the transmitting portion, a wheel speed sensor for detecting a rotational speed of a wheel of the tire, a control portion for feeding a signal from the wheel speed sensor and the signal from the receiving portion, an electric power source wire for connecting the wheel speed sensor to the control portion, a signal input wire for connecting the electric power source wire to the receiving portion, and a filter disposed at the electric power source wire between a connection point with the signal input wire and the control portion for blocking the signal transmitted from the transmitting portion.

Tire inflation pressure detection apparatus

A tire information detecting device includes detecting means for detecting a state quantity in a tire, transmitting means for transmitting a signal outputted from the detecting means, receiving means for receiving the signal transmitted from the transmitting means, the receiving means mounted at a vehicle body side, and a brake actuator adjusted to apply a braking force to the vehicle. The receiving means is positioned at a radially inner side from a major diameter of the brake actuator.

Tire information detecting device

The angular speed sensor device includes a drive frame and a detecting frame which are supported on a silicon substrate in a floating mode. The drive frame and the detecting frame are provided with an angular speed about the z-axis when the drive frame and the detecting frame are driven to vibrate in the x-direction, the resulting Corliolis force causing the detecting frame to oscillate in the y-direction. Such a y-direction oscillation of the detecting frame is detected as a displacement signal. On the basis of the displacement signal, the applied angular speed is calculated. The angular speed sensor device includes detecting electrodes and which drive the detecting frame to vibrate in the y-direction when a drive signal is fed to each of the detecting electrodes and which changes the electrostatic capacitance between the detecting frame and each of the detecting electrodes and On the basis of the drive signal and the displacement signal which are fed to each of the detecting electrodes and , the resonant frequency of the detecting frame when it is driven to vibrate in the y-direction and the corresponding Q-value are determined.

Angular speed sensor device

An actuator for an oscillator which is capable of minimizing the fluctuation of the detection error of the oscillation condition of an electrostatic driven oscillator and shortening rise time of the oscillation amplitude of the electrostatic driven oscillator during starting. An actuator oscillates a drive frame and a detecting frame in the X-direction by outputting the drive signal to an electrode and detects the displacement of the drive frame in the X-direction as the displacement signal. The actuator generates a direct-current voltage component of the drive signal controlled to be increased or decreased based on the detected displacement signal and an alternating voltage component of the drive signal having a constant amplitude to maintain the constancy of the oscillation amplitude of the drive frame based on the detected displacement signal. During starting, the actuator generates an alternating voltage component of the drive signal having a larger amplitude compared to at normal operation condition.

Actuator for oscillator

An actuator for an oscillator which can control the fluctuation of the oscillation of an electrostatic driven oscillator such as the detection error by controlling the fluctuation of the amount of the noise mixed into a displacement detecting signal. An actuator oscillates a drive frame and a detecting frame in the X-direction by outputting the drive signal to a drive electrode to detect the displacement of the drive frame in the X-direction as a displacement detecting signal. The actuator generates a direct-current voltage component of the drive signal increased or decreased based on the detected displacement signal and the alternating voltage component of the drive signal having a constant amplitude to maintain the oscillation amplitude of the drive frame constant.

Growing community of inventors

Nagoya, Japan

Manabu Kato