Electronic key system and motorcycle using the same
First Claim
1. An electronic key system that includes an electronic key for holding identification information and a verification unit for wirelessly connecting to the mounted electronic key and verifying the electronic key, the electronic key system wherein the verification unit has:
- a mounting unit that allows the electronic key to be mounted and dismounted,a communication circuit that is disposed adjacent to the mounting unit, generates a temporally varying transmission electromagnetic field, and detects electromagnetic field variations originating in the electronic key, anda controller for acquiring the identification information on the basis of the detected electromagnetic field variations, performing verification on the basis of the identification information, and controlling prescribed operation control in accordance with a result of the verification; and
the electronic key has;
an antenna for converting variations in the transmission electromagnetic field to drive power of the electronic key and generating the electromagnetic field variations,a storage unit for holding the identification information, anda response circuit for varying in a plurality of stages electric current that flows to the antenna in accordance with data that expresses the identification information, and generating the electromagnetic field variations.
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Accused Products
Abstract
The present invention provides a battery-free electronic key used in motorcycles and improves security.
A communication circuit (44) is actuated when an electronic key is inserted into a keyhole. An electromotive force generated in a coil L2 is rectified by a power circuit (74) and supplied to the components of an electronic key-side circuit (40) as a source of power, in accordance with the variations of an electromagnetic field having a frequency of f0 generated by the communication circuit (44). The electronic key-side circuit (40) reads identification information from a storage unit (72), and the information is converted to ternary value data in a binary value/ternary value conversion circuit (70). Transistors Tr1 and Tr2 are switched on and off in accordance with the bit values of 2-bit data that expresses ternary value data, which generates three-stage variations in the electromagnetic field between coils L1 and L2. The communication circuit (44) detects this fluctuation, and the ternary value/binary value conversion circuit (54) converts the data from a ternary value to binary value data to acquire the original identification information. An ECU (56) verifies the identification information and starts the engine (62) when verification has been established.
12 Citations
16 Claims
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1. An electronic key system that includes an electronic key for holding identification information and a verification unit for wirelessly connecting to the mounted electronic key and verifying the electronic key, the electronic key system wherein the verification unit has:
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a mounting unit that allows the electronic key to be mounted and dismounted, a communication circuit that is disposed adjacent to the mounting unit, generates a temporally varying transmission electromagnetic field, and detects electromagnetic field variations originating in the electronic key, and a controller for acquiring the identification information on the basis of the detected electromagnetic field variations, performing verification on the basis of the identification information, and controlling prescribed operation control in accordance with a result of the verification; and
the electronic key has;an antenna for converting variations in the transmission electromagnetic field to drive power of the electronic key and generating the electromagnetic field variations, a storage unit for holding the identification information, and a response circuit for varying in a plurality of stages electric current that flows to the antenna in accordance with data that expresses the identification information, and generating the electromagnetic field variations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification