Mitsubishi Denki Kabushiki Kaisha

Masato Sumida

Naohisa Uehara

Masahiko Katayama

Masayoshi Ono

Tetsuya Ooba

Minoru Nishida

A communication apparatus for a vehicle achieves reduction in size and cost of a portable unit by making unnecessary an oscillation circuit and a battery in the portable unit. The apparatus is provided with an on-board unit installed on the vehicle and a portable unit carried by a user of the vehicle. A response signal is sent from the portable unit to the on-board unit in response to a signal transmitted from the on-board unit. The portable unit includes a power generation circuit for supplying electric power to circuits in the portable unit by a power generation radio wave sent from the on-board unit, and the on-board unit sends a communication signal after sending the power generation radio wave.

Communication apparatus for vehicle

A communication apparatus for a vehicle can achieve an inexpensive technique for determining whether a portable unit exists inside or outside the vehicle without depending upon LF band radio waves through contactless communication using high frequency band radio waves by separating a reader function of a reader/writer into the portable unit and an on-board unit. The apparatus includes at least one ID transmitter installed on a vehicle and sends a transmitter ID possessed by itself in response to reception of a radio wave, an on-board unit installed on the vehicle for radiating a radio wave to the ID transmitter, a portable unit that receives the transmitter ID sent by the ID transmitter, and an ID communication section for sending the transmitter ID from the portable unitto the on-board unit. The on-board unit determines the position of the portable unit based on the transmitter ID received from the portable unit.

A vehicle-roadside service providing system enables a user to use even a service which is not accommodated by on-board service client equipment installed on a vehicle. A service host equipment ( ) stores a service sequence that describes the content of a service. Service client equipment ( ) acquires the service sequence from the service host equipment ( ) through DSRC equipment ( ) at the times of execution of the service. The service sequence is sequentially executed by sequence step executing parts ( ) while performing data transmission and reception through communications between the service host equipment ( ) and the service client equipment ( ) based on the service sequence. Information insufficient in the course of the service is received from the user by a human interface part ( ).

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Tokyo, Japan

Masato Sumida