PROBLEM TO BE SOLVED: To enable signals from a key-free system and a TPMS (Tire Pressure Monitoring System) to be constantly received even during parking and running by a simple and inexpensive constitution without using two quarts oscillators on the assumption of the changeover of reception as in the past.SOLUTION: A reception frequency of a key collation signal via one common antenna 4 is switched so as to be high during parking, and to be low during running by a receiving circuit 3. As a result, even if a frequency of the key collation signal from a portable transmitter 1 of a key-free system and a frequency of a sensor detection signal from an air pressure sensor of a TPMS 2 are substantially the same each other, the key collation signal and the sensor detection signal can be received by the common antenna 4 irrespective of the parking and running.SELECTED DRAWING: Figure 1
【課題】従来のように受信の切り換えを前提にして2つの水晶振動子を使用することなく、キーフリーシステムおよびTPMSからの信号を、簡単かつ安価な構成により、停車中も走行中も常時受信できるようにする。【解決手段】1つの共通アンテナ4を介したキー照合信号の受信頻度が、受信回路3により停車中には高く、走行中には低く切り換えるようにする。これにより、キーフリーシステムの携帯送信機1からのキー照合信号、および、TPMS(タイヤ空気圧監視システム)2の空気圧センサからのセンサ検出信号の周波数がほぼ同じであっても、停車中、走行中に関係なく、キー照合信号およびセンサ検出信号を共通アンテナ4により受信することができる。【選択図】図1
ON-VEHICLE RECEIVING APPARATUS
車載受信装置
2017-10-26
Patent
Electronic Resource
Japanese
WIRELESS POWER TRANSMITTING/RECEIVING APPARATUS AND RECEIVING APPARATUS FOR ELECTRIC VEHICLE
European Patent Office | 2021
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