Vehicle electronic key system
First Claim
1. A vehicle electronic key system having a vehicle-mounted device, and a portable device for receiving a request signal transmitted from the vehicle-mounted device and for transmitting an answer signal, the portable device comprising:
- a receiving circuit for receiving the request signal;
a single receiving-sensitivity changing switch;
a receiving-sensitivity indicator for indicating receiving sensitivity of the receiving circuit; and
receiving-sensitivity changing control means for displaying receiving sensitivity of the receiving circuit on the receiving-sensitivity indicator, and for changing the receiving sensitivity of the receiving circuit on the basis of operation of the single receiving-sensitivity changing switch,wherein the receiving sensitivity of the receiving circuit is normally in a high sensitivity state, the high sensitivity state being a default state,wherein when the receiving sensitivity is the high sensitivity state, and the single receiving-sensitivity changing switch is operated for shorter than a predetermined period of time, the receiving sensitivity remains unchanged and the receiving-sensitivity indicator indicates the high receiving sensitivity by exhibiting a first color, whereas when the single receiving-sensitivity changing switch is operated for longer than the predetermined period of time the receiving sensitivity is changed to a sensitivity state that is lower than the high sensitivity state, thereby reducing an influence of signals from sources other than vehicle-mounted device, and the receiving-sensitivity indicator indicates the low receiving sensitivity by exhibiting a second color, andwherein when the receiving sensitivity is the low sensitivity state, and the single receiving-sensitivity changing switch is operated for shorter than the predetermined period of time, the receiving sensitivity remains unchanged and the receiving-sensitivity indicator indicates the low receiving sensitivity by exhibiting the second color, whereas when the receiving sensitivity of the receiving circuit is the lower sensitivity state, and the single receiving-sensitivity changing switch is operated for longer than the predetermined period of time, the receiving sensitivity is changed from the lower sensitivity state to the high sensitivity state, and the receiving-sensitivity indicator indicates the high receiving sensitivity by exhibiting the first color.
1 Assignment
0 Petitions
Accused Products
Abstract
To ensure a perform authentication based on a request signal Sr which is the authorized radio signal even under a bad radio environment in which radio noise comes continuously. A portable device receives a request signal Sr transmitted from a vehicle-mounted device and transmits an answer signal including a receiving-sensitivity changing switch for changing a receiving sensitivity of a receiving circuit which receives the request signal Sr. As a result, even if the authentication cannot be carried out with normal receiving sensitivity due to the influence of the continuous radio noise, by changing the receiving sensitivity to low sensitivity, and by bringing the portable device physically close to a transmission source of the request signal which is the authorized radio signal, it is possible to dramatically increase the probability that the authentication based on the authorized radio signal can be carried out.
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Citations
20 Claims
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1. A vehicle electronic key system having a vehicle-mounted device, and a portable device for receiving a request signal transmitted from the vehicle-mounted device and for transmitting an answer signal, the portable device comprising:
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a receiving circuit for receiving the request signal; a single receiving-sensitivity changing switch; a receiving-sensitivity indicator for indicating receiving sensitivity of the receiving circuit; and receiving-sensitivity changing control means for displaying receiving sensitivity of the receiving circuit on the receiving-sensitivity indicator, and for changing the receiving sensitivity of the receiving circuit on the basis of operation of the single receiving-sensitivity changing switch, wherein the receiving sensitivity of the receiving circuit is normally in a high sensitivity state, the high sensitivity state being a default state, wherein when the receiving sensitivity is the high sensitivity state, and the single receiving-sensitivity changing switch is operated for shorter than a predetermined period of time, the receiving sensitivity remains unchanged and the receiving-sensitivity indicator indicates the high receiving sensitivity by exhibiting a first color, whereas when the single receiving-sensitivity changing switch is operated for longer than the predetermined period of time the receiving sensitivity is changed to a sensitivity state that is lower than the high sensitivity state, thereby reducing an influence of signals from sources other than vehicle-mounted device, and the receiving-sensitivity indicator indicates the low receiving sensitivity by exhibiting a second color, and wherein when the receiving sensitivity is the low sensitivity state, and the single receiving-sensitivity changing switch is operated for shorter than the predetermined period of time, the receiving sensitivity remains unchanged and the receiving-sensitivity indicator indicates the low receiving sensitivity by exhibiting the second color, whereas when the receiving sensitivity of the receiving circuit is the lower sensitivity state, and the single receiving-sensitivity changing switch is operated for longer than the predetermined period of time, the receiving sensitivity is changed from the lower sensitivity state to the high sensitivity state, and the receiving-sensitivity indicator indicates the high receiving sensitivity by exhibiting the first color. - View Dependent Claims (2, 3, 4, 6, 7, 8, 9, 10)
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5. A vehicle electronic key system having a vehicle-mounted device, and a portable device for receiving a request signal transmitted from the vehicle-mounted device and for transmitting an answer signal, the portable device comprising:
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a receiving circuit for receiving the request signal; a single receiving-sensitivity changing switch; and receiving-sensitivity changing control means for changing receiving sensitivity of the receiving circuit on the basis of operation of the single receiving-sensitivity changing switch, wherein the receiving sensitivity of the receiving circuit is normally in a high sensitivity state, and in order to improve authentication between the portable device and the vehicle-mounted device, the single receiving-sensitivity changing switch is operated for longer than a predetermined period of time which changes the receiving sensitivity to a sensitivity state that is lower than the high sensitivity state, thereby reducing an influence of signals from sources other than vehicle-mounted device, and when the receiving sensitivity of the receiving circuit is the lower sensitivity state., and the single receiving-sensitivity changing switch is operated for longer than the predetermined period of time, the receiving sensitivity is changed from the lower sensitivity state to the high sensitivity state, the high sensitivity state being a default state, wherein the portable device further comprises an LED which exhibits a first color when the current receiving sensitivity of the receiving circuit is the lower sensitivity state and the receiving-sensitivity changing switch is operated for less than the predetermined period of time, and exhibits a second color when the receiving sensitivity of the receiving circuit is the high sensitivity state and the receiving-sensitivity changing switch is operated for less than the predetermined period of time, wherein the LED changes between the first the second colors only when the single receiving-sensitivity changing switch is operated for longer than the predetermined period of time.
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11. A vehicle electronic key system having a vehicle-mounted device, and a portable device for receiving a request signal transmitted from the vehicle-mounted device and for transmitting an answer signal, the portable device comprising:
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a receiving circuit for receiving the request signal, said receiving circuit includes an antenna and a signal demodulating and amplifying circuit; a receiving-sensitivity indicator for indicating receiving sensitivity of the receiving circuit; a single receiving-sensitivity changing switch; and receiving-sensitivity changing control means adapted to display receiving sensitivity of the receiving circuit on the receiving-sensitivity indicator, and to change the receiving sensitivity of the receiving circuit only when the single receiving-sensitivity changing switch is operated for a longer period of time than the predetermined period of time, wherein the receiving-sensitivity changing control means is adapted to not change the receiving sensitivity of the receiving circuit when the receiving-sensitivity changing switch is operated for any period of time that is a shorter period of time than the predetermined period of time, wherein the shorter period of time is any period of time greater than zero and less than the predetermined period of time, wherein the receiving sensitivity of the receiving circuit is normally in a high sensitivity state, and wherein when the receiving sensitivity is the high sensitivity state, and the single receiving-sensitivity changing switch is operated for shorter than the predetermined period of time, the receiving sensitivity remains unchanged and the receiving-sensitivity indicator indicates the high receiving sensitivity by exhibiting a first color, whereas when the single receiving-sensitivity changing switch is operated for longer than a predetermined period of time, the receiving sensitivity is changed to a sensitivity state that is lower than the high sensitivity state, thereby reducing an influence of signals from sources other than vehicle-mounted device, and the receiving-sensitivity indicator indicates the low receiving sensitivity by exhibiting a second color, and wherein when the receiving sensitivity is the low sensitivity state, and the single receiving-sensitivity changing switch is operated for shorter than a predetermined period of time, the receiving sensitivity remains unchanged and the receiving-sensitivity indicator indicates the low receiving sensitivity by exhibiting the second color, whereas when the receiving sensitivity of the receiving circuit is the lower sensitivity state, and the single receiving-sensitivity changing switch is operated for longer than the predetermined period of time, the receiving sensitivity is changed from the lower sensitivity state to the high sensitivity state, and the receiving-sensitivity indicator indicates the high receiving sensitivity by exhibiting the first color. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification