Abstract: In a passive entry comprising a car-mounted transmitter-receiver and one or more portable transmitter-receivers, the car-mounted transmitter-receiver generates a request signal, when any of the portable transmitter-receivers receives the request signal, an answer signal is transmitted in response to the request signal, and when the car-mounted transmitter-receiver receives the answer signal, the car door is locked or unlocked. The car-mounted transmitter-receiver has a timer for counting time from transmission of the request signal to reception of the answer signal, and when the answer signal is received, recognizes the answer signal as legal only when an elapsed-time value counted by the timer is within a valid elapsed-time value set in advance, and exercises control of a controlled apparatus, such as, e.g., locking and unlocking of the car door.

Abstract: The portable device 2 is provided with a control IC 3, an antenna 4 having both ends thereof connected to input and output terminals of the control IC 3 for wirelessly transmitting or receiving signals, a level detector 5 for detecting the receiving level of the antenna 4, a Qdump circuit 6 that operates only when the level detector 5 detects the receiving level which exceeds an allowable value of the control IC 3 and that varies the quantity of Qdump in accordance with the receiving level of the antenna 4, and a time constant circuit 7 or a latch circuit 8 for holding the Qdump circuit 6 in its operational state in an OFF period of an LF modulation signal.

Abstract: A solution is to provide a tire air pressure monitor comprising: tire air pressure sensors and transmitters which are respectively annexed to tires; two receiving antennas which receive a transmitting signal from each of the transmitters; phase shifters which shift signal phases received from the receiving antennas respectively by control voltages; a synthesizer which synthesizes outputs from the phase shifters; and a meter which detects an output level from the synthesizer, wherein, the two receiving antennas are arranged so that receiving phase differences between the receiving antennas as to the transmitting signal from each of the transmitters are made different, the control voltages for the phase shifters are respectively obtained in advance, which maximize the output level from the synthesizer, as to respective tire mounting positions, and stores an association table relating each of the tire mounting positions to the control voltages, and the control voltages are controlled so that the output level fro

Abstract: In an amplifying circuit for a transmitter including a first switching device having one end thereof connected to a power supply, a second switching device having one end thereof connected to another end of the first switching device and another end thereof grounded and an antenna connected to a junction point of the first switching device and the second switching device, wherein the first switching device and the second switching device 12 are alternately driven by a driver, the driver and a control electrode of the first switching device as well as the driver and a control electrode of the second switching device are connected through a common mode filter.

Abstract: A keyless entry apparatus includes an on-vehicle transmitting and receiving device mounted on a vehicle, and a portable transmitting and receiving device. The on-vehicle transmitting and receiving device has a plurality of antennas mounted close to members to be controlled of the vehicle, and a plurality of transmitting sections which are connected to the plurality of antennas and which transmit request signals having unique antenna IDs. The plurality of transmitting sections intermittently transmit request signals from the corresponding antennas. When the portable transmitting and receiving device receives any of the transmitted request signals, the portable transmitting and receiving device transmits an answer signal which controls the member to be controlled corresponding to the transmitting section which transmitted the received request signal.

Abstract: A receiving antenna for receiving low frequency signals is constituted by arranging two loop antenna elements and one air-core loop antenna element close to each other, wherein the two loop antenna elements are arranged in combination such that a magnetic flux which passes an axis of each one loop antenna element is prevented from passing an axis of another loop antenna element, and one air-core loop antenna element is arranged in combination with the two loop antenna elements such that an axis of the air-core loop antenna crosses respective axes of the one and other loop antenna elements orthogonally.

Abstract: A receiving antenna is formed by disposing two ferrite chip antenna elements adjacently to each other. The two ferrite chip antenna elements are disposed in combination so that a magnetic flux passing through the central axis of one of the ferrite chip antenna elements does not pass through that of the other of the ferrite chip antenna elements. Herein, the two ferrite chip antenna elements are disposed in combination so as to intersect each other substantially at right angles in a state in which one end portion of one of the ferrite chip antenna elements is opposed to a side surface portion of the other of the ferrite chip antenna elements.

Abstract: It is an object of the present invention to provide a remote control system for a vehicle wherein the contents of control are changed depending on the distance between the vehicle and a portable transmitter, for example with a locking command signal provided from the portable transmitter in a vehicle invisible state, a window is not closed. According to the present invention, for achieving the above-mentioned object, the portable transmitter transmits both first and second transmission signals together, and when a receiver has received at least the first transmission signal, a control circuit section outputs a first control signal and at this time both a first device (locking/unlocking mechanism) and a second device (window opening/closing mechanism) are operated, while when the receiver has received only the second transmission signal, the control circuit section outputs a second control signal and at this time only the first device is controlled.

Abstract: In a passive entry comprising a car-mounted transmitter-receiver and one or more portable transmitter-receivers, the car-mounted transmitter-receiver generates a request signal, when any of the portable transmitter-receivers receives the request signal, an answer signal is transmitted in response to the request signal, and when the car-mounted transmitter-receiver receives the answer signal, the car door is locked or unlocked. The car-mounted transmitter-receiver has a timer for counting time from transmission of the request signal to reception of the answer signal, and when the answer signal is received, recognizes the answer signal as legal only when an elapsed-time value counted by the timer is within a valid elapsed-time value set in advance, and exercises control of a controlled apparatus, such as, e.g., locking and unlocking of the car door.

Abstract: The present invention provides an air-bag control apparatus wherein, when an air-bag sensor detects a car collision, a switching gate passes on a modulation signal originated from a signal generation means to a first modulation circuit which modulates a carrier received from a first-carrier generation means in accordance with a pattern of the modulation signal. A modulated carrier obtained as a result of the modulation is received by a first demodulation circuit which demodulates the modulated carrier to produce a demodulated signal supplied to a signal comparison circuit. The signal comparison circuit compares the demodulated signal with the modulation signal received from the signal generation means. Only if the demodulated signal matches the modulation signal is an activation signal output for activating the air-bag unit.

Abstract: It is intended to provide a non-contact transformer which simplifies attachment work, causes no sound of rubbing between wires or resistance during steering wheel manipulation, increases the transmission efficiency, and can be manufactured easily by virtue of a minimized warp occurring during manufacture of a core. A non-contact transformer is provided that includes two disc-shaped magnetic cores (19) each having at least one concentric and radial groove (21), and a magnetic sleeve (25) having a cylindrical shape or a pot shape having an opening at the center of the bottom surface. The two magnetic cores are opposed to each other with a predetermined distance left therebetween in a space enclosed by the magnetic sleeve. A wining (23) of wire is accommodated in the at least one concentric groove. Each of the magnetic cores is a combination of a plurality of fan-shaped partial cores (27) to be formed in a disc shape.

Abstract: A vehicle-mounted input unit capable of enabling the manual manipulator to give its operator a feel of resistance varying with what is done by operating the manipulator and thereby affording excellent operating convenience is to be provided. In a memory unit provided in a control section are stored tables showing correlations between the operating directions and quantity of a manual manipulator and an external force applied to the manual manipulator from actuators. The control section determines the direction and magnitude of the external force to be applied to the manual manipulator from positional information supplied from position sensors and the tables and drives the actuators via an actuator driver. The external force to be applied to the manual manipulator can be regulated either according to the movable range of a vehicle-mounted electric device from its current position to an end of its possible motion or according to the magnitude of the working force applied to the manual manipulator.

Abstract: The present invention provides an input device allowing automatic customization of selection of function switches and functions assigned to the operating direction of a manual operating pad in a manner most suitable to the habit and subjective bias of operators to prevent any mistakes. The input device includes a mistake counter means, which increments the counted number of mistakes by determining, when any part of an input unit is operated within a predetermined period of time after another part of the input unit has been operated, that the preceding operation is a mistake; and a controller unit will replace the function assigned to the preceding operating action with another function in a function table, when the counted number of times of mistakes reaches a predetermined number.

Abstract: A keyless entry apparatus includes an on-vehicle transmitting and receiving device mounted on a vehicle, and a portable transmitting and receiving device. The on-vehicle transmitting and receiving device has a plurality of antennas mounted close to members to be controlled of the vehicle, and a plurality of transmitting sections which are connected to the plurality of antennas and which transmit request signals having unique antenna IDs. The plurality of transmitting sections intermittently transmit request signals from the corresponding antennas. When the portable transmitting and receiving device receives any of the transmitted request signals, the portable transmitting and receiving device transmits an answer signal which controls the member to be controlled corresponding to the transmitting section which transmitted the received request signal.

Abstract: An apparatus for searching for a sensed object which is capable of immediately finding the direction in which a movable sensed object is present, from the contents displayed on an operation unit at hand. The searching apparatus includes a portable operation unit, an absolute direction sensor contained in the operation unit and generating an absolute direction signal which indicates an absolute direction, a removal sensor for automatically sensing a removal of the operation unit from the sensed object, a displacement sensor for sensing the state of displacement of the operation unit to generate displacement information, a controller generating direction indicating information which indicates the direction in which the sensed object is present, based on the displacement information and the absolute direction signal, a display for displaying contents of the direction indicating information; and a manual operation element for controlling the contents displayed on the display through the controller.

Abstract: The invention provides a detection object searching device which makes it possible to immediately know the direction of a mobile detection object such as a car by information presented on a display of a portable unit. The detection object searching device includes a portable operation unit and a body unit. The operation unit includes a transmission section for transmitting a search signal upon operation of a transmission button, a receiving section for receiving a direction indication information signal, an absolute direction detecting section for generating an absolute direction signal, a control section for generating direction indication information indicating the direction of the car based on the direction information signal and absolute direction signal, and a display section for displaying the direction indication information.