Title:
ELECTRONIC KEY SYSTEM AND AUTOBICYCLE USING THE SAME
Document Type and Number:
WIPO Patent Application WO/2006/129426
Kind Code:
A1
Abstract:
To achieve the batteryless of electronic keys used for autobicycles and improve the security. While an electronic key is inserted in a keyhole, a communication circuit (44) is activated. An electromotive force, which occurs in a coil (L2) in accordance with the variation of an electromagnetic field of a frequency (f0) generated by the communication circuit (44), is rectified by a power supply circuit (74) and then supplied to the components of an electronic key side circuit (40) as a power supply. In the electronic key side circuit (40), identification information is read from a storage part (72) and then converted to ternary data by a binary value/ternary value converting circuit (70). The on/off controls of transistors (Tr1,Tr2) are performed in accordance with the bit values of 2-bit data representative of the ternary data, thereby changing the impedances of a coil (L1) in three levels to induce three levels of variation in the electromagnetic field between the coils (L1,L2). The communication circuit (44) detects this variation, and then a ternary value/binary value converting circuit (54) performs a ternary value-to-binary value conversion to acquire the original identification information. An ECU (56) examines the identification information. If the identification information is verified, then the ECU (56) activates an engine (62).
Inventors:
SUZUKI HIROHISA (JP)
FUKUDA YOSHIYUKI (JP)
KUNIMI TAKASHI (JP)
FUKUDA YOSHIYUKI (JP)
KUNIMI TAKASHI (JP)
Application Number:
PCT/JP2006/308029
Publication Date:
December 07, 2006
Filing Date:
April 17, 2006
Export Citation:
Assignee:
SANYO ELECTRIC CO (JP)
AKEBONO BRAKE IND (JP)
SUZUKI HIROHISA (JP)
FUKUDA YOSHIYUKI (JP)
KUNIMI TAKASHI (JP)
AKEBONO BRAKE IND (JP)
SUZUKI HIROHISA (JP)
FUKUDA YOSHIYUKI (JP)
KUNIMI TAKASHI (JP)
International Classes:
B62H5/00; E05B49/00; B62J99/00; F02N15/00
Foreign References:
| JP2003525793A | 2003-09-02 | |||
| JP2003253937A | 2003-09-10 | |||
| JP2000127900A | 2000-05-09 |
Attorney, Agent or Firm:
HARUKA PATENT & TRADEMARK ATTORNEYS (28-4 Yotsuya 4-chom, Shinjuku-ku Tokyo 04, JP)
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