Method for adjusting a threshold value of a vehicle-mounted device employed in an automatic toll-collecting system
First Claim
1. A method of controlling communication between components in an automatic toll-collecting system, comprising:
- providing a vehicle-mounted device that is activated upon receipt of activating signals at or above a threshold signal level;
providing a roadside device that selectively communicates with the vehicle-mounted device, and that includes a threshold-value adjusting device that is capable of adjusting the threshold signal level of the vehicle-mounted device;
sending an activating signal from the roadside device to the vehicle-mounted device when the vehicle-mounted device is within a predetermined range of the roadside device;
selectively adjusting the threshold level of the vehicle-mounted device based on the step of sending an activating signal; and
sending a toll collecting signal, having a signal level closely corresponding to the adjusted threshold level of the vehicle-mounted device, from the roadside device to the vehicle-mounted device.
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Accused Products
Abstract
A vehicle-mounted device that enables adjustment by wireless communication from an external portion, of a threshold value employed for detecting strength of a radio wave emitted from a roadside device. A vehicle-mounted device is disposed within an electromagnetic-shield box, and radio waves for activating use are sent from an antenna within the electromagnetic-shield box to the vehicle-mounted device. The vehicle-mounted device, when activated by this radio wave for activating use, sends an activation acknowledgement signal. A computer determines whether the vehicle-mounted device has been activated according to the presence or absence of the activation acknowledgement signal. The computer sends a radio wave from the antenna to the vehicle-mounted device to set a threshold value in correspondence to the presence or absence of this activation, and sets the threshold value of the vehicle-mounted device. These operations are performed repeatedly to adjust the threshold value of the vehicle-mounted device to an appropriate value.
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Citations
31 Claims
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1. A method of controlling communication between components in an automatic toll-collecting system, comprising:
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providing a vehicle-mounted device that is activated upon receipt of activating signals at or above a threshold signal level; providing a roadside device that selectively communicates with the vehicle-mounted device, and that includes a threshold-value adjusting device that is capable of adjusting the threshold signal level of the vehicle-mounted device; sending an activating signal from the roadside device to the vehicle-mounted device when the vehicle-mounted device is within a predetermined range of the roadside device; selectively adjusting the threshold level of the vehicle-mounted device based on the step of sending an activating signal; and sending a toll collecting signal, having a signal level closely corresponding to the adjusted threshold level of the vehicle-mounted device, from the roadside device to the vehicle-mounted device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of controlling a vehicle-mounted device in an automatic toll collection system, comprising the steps of:
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sending a strong field activating signal to the vehicle-mounted device; sending a threshold value setting instruction upon receipt of the activating signal by the vehicle-mounted device; sending a standard field activating signal, corresponding to a toll system signal, to the vehicle-mounted device upon receipt of the threshold value setting instruction by the vehicle-mounted device; and adjusting the threshold signal value of the vehicle-mounted device to closely correspond to the standard field activating signal to ensure toll system communication quality. - View Dependent Claims (9, 10, 11, 12)
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13. A method of operation of a vehicle-mounted device in a toll collection system, comprising the steps of:
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becoming activated upon receipt of a system activating signal; adjusting a threshold signal upon receiving a threshold value setting instruction; receiving a standard field activating signal corresponding to a toll collection device signal; and receiving a threshold value setting instruction, based on the step of receiving a standard field activating signal, that adjusts the threshold value to a level that ensures toll system communication quality.
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14. An automatic toll collection system, comprising:
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a toll collecting device that transmits a toll fare communication signal; a vehicle-mounted device that communicates with the toll collecting device when the communication signal is at or above a predetermined threshold level; and a threshold value setting device associated with the toll collecting device that adjusts the threshold level of the vehicle-mounted device based on a level of the toll fare communication signal. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of adjusting a threshold value of a vehicle-mounted device employed in an automatic toll-collecting system, comprising the steps of:
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providing a vehicle-mounted device that is activated upon receipt of activating signals at or above a threshold signal level; providing a threshold value adjusting device that selectively communicates with the vehicle-mounted device, and that is capable of adjusting the threshold signal value of the vehicle-mounted device based on a toll collection signal strength; sending an activating signal from the threshold value adjusting device to the vehicle-mounted device to activate the vehicle-mounted device; sending a threshold value setting signal from the threshold value adjusting device to the vehicle-mounted device based on the step of sending an activating signal; and adjusting the threshold value at the vehicle-mounted device based on the step of sending a threshold value setting signal. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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Specification