Abstract: A vehicle control device has first and second transmission circuits that communicate by radio with a portable unit and also has a control section that, when the portable unit is confirmed to be correct, engages in a permission mode that permits the start of an engine. The first and second transmission circuits transmit first and second request signals from first and second transmission antennas to first and second communicatable areas respectively. When a back door is detected to be open, the control section does not permit the start of the engine even if an ID code signal is returned from the portable unit in response to the second request signal.

Abstract: A vehicle security system for improving convenience without lowering the security level. The vehicle communication system includes a plurality of portable devices and a communication controller, which communicates with the portable devices and controls a vehicle. The communication controller includes a first transmitter circuit, which transmits a first wireless signal within an area near the vehicle, a second transmitter circuit, which transmits a second wireless signal within an area in the passenger compartment of the vehicle, and a communication control unit, which controls at least the closing of a door lock. When a door lever is operated in a state in which the door lock is closed, the communication control unit closes the door lock when one of the portable devices is located near the vehicle and keeps the door lock closed when none of the portable devices is located near the vehicle.

Abstract: A vehicle control device has first and second transmission circuits that communicate by radio with a portable unit and also has a control section that, when the portable unit is confirmed to be correct, engages in a permission mode that permits the start of an engine. The first and second transmission circuits transmit first and second request signals from first and second transmission antennas to first and second communicatable areas respectively. When a back door is detected to be open, the control section does not permit the start of the engine even if an ID code signal is returned from the portable unit in response to the second request signal.

Abstract: A portable device for facilitating adjustment of the area in which communication with a controller is enabled. The portable device performs wireless communication with an in-vehicle device, which controls a door lock driver or an engine starter of a vehicle, to remotely control the in-vehicle device. The portable device includes a receiver for receiving a request signal from the in-vehicle device and a control unit for lowering or raising the signal receiving sensitivity of the receiver by predetermined levels to adjust the signal receiving sensitivity.

Abstract: A vehicle lock controller that is easily used. The controller is installed in a vehicle having a plurality of doors and controls locking of the doors through communication with a portable device. The controller includes transmitting circuits, each provided in association with a corresponding one of the doors to output a request signal and request the portable device to transmit a response signal. A control unit is connected to the transmitting circuits to intermittently output the request signal from each of the transmitting circuits at a predetermined cycle. The control unit determines a priority order of the transmitting circuits to set the predetermined cycle of the request signal output from each transmitting circuit in accordance with the priority order.

Abstract: A lighting system that automatically turns on lights with a key used for locking the doors of a car and a house. The system includes the key and a lighting device. The key generates and transmits a transmission signal containing verification subject information. A light control unit connected to the lighting device receives the transmission signal from the key and verifies the key with an ID code. The light control unit activates the lighting device.

Abstract: A portable device for facilitating adjustment of the area in which communication with a controller is enabled. The portable device performs wireless communication with an in-vehicle device, which controls a door lock driver or an engine starter of a vehicle, to remotely control the in-vehicle device. The portable device includes a receiver for receiving a request signal from the in-vehicle device and a control unit for lowering or raising the signal receiving sensitivity of the receiver by predetermined levels to adjust the signal receiving sensitivity.

Abstract: An inexpensive communicator that forms an optimal communication electric field. A vehicle interior transmitter circuit includes a main transmitter circuit having a ferrite antenna for generating a main electric field. A closed loop antenna includes a basal end coil, inductively coupled to the main antenna, and a distal end coil, for generating an auxiliary electric field based on the inductive coupling.

Abstract: A lighting system that automatically turns on lights with a key used for locking the doors of a car and a house. The system includes the key and a lighting device. The key generates and transmits a transmission signal containing verification subject information. A light control unit connected to the lighting device receives the transmission signal from the key and verifies the key with an ID code. The light control unit activates the lighting device.

Abstract: A vehicle lock controller that is easily used. The controller is installed in a vehicle having a plurality of doors and controls locking of the doors through communication with a portable device. The controller includes transmitting circuits, each provided in association with a corresponding one of the doors to output a request signal and request the portable device to transmit a response signal. A control unit is connected to the transmitting circuits to intermittently output the request signal from each of the transmitting circuits at a predetermined cycle. The control unit determines a priority order of the transmitting circuits to set the predetermined cycle of the request signal output from each transmitting circuit in accordance with the priority order.