Antenna device in automotive keyless entry system
First Claim
Patent Images
1. An antenna device for an automotive keyless entry system comprising:
- a lock device mounted on a vehicle and operable between a first locking position and a second unlocking position, and said lock device including an actuator operating said lock device between said first and second positions in response to a control signal;
a pocket-portable transmitter producing a radio signal containing a unique code identifying the transmitter, said transmitter having a first loop antenna;
a controller receiving said radio signal and comparing said unique code contained in said radio signal with a preset code therein, and producing said control signal when said unique code matches said preset code said controller operatively connected to provide said control signal to said actuator;
a second antenna connected to said controller and surrounding a vehicle compartment.
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Abstract
In a ratio-mediated keyless entry system for an automotive vehicle, two vehicle-mounted antennae, lying in mutually perpendicular planes are used to receive radio signals from a portable, manually operable transmitter. When the transmitter is left in the passenger compartment and then the doors are locked, the system generates an alarm to notify the driver of the fact. On antenna completely encircles the passenger compartment. Encircling the passenger compartment with one of the vehicle-mounted antennae ensures that wherever the transmitter is left in the passenger compartment, its presence will be detected no matter how limited the transmitter'"'"'s range.
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Citations
15 Claims
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1. An antenna device for an automotive keyless entry system comprising:
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a lock device mounted on a vehicle and operable between a first locking position and a second unlocking position, and said lock device including an actuator operating said lock device between said first and second positions in response to a control signal; a pocket-portable transmitter producing a radio signal containing a unique code identifying the transmitter, said transmitter having a first loop antenna; a controller receiving said radio signal and comparing said unique code contained in said radio signal with a preset code therein, and producing said control signal when said unique code matches said preset code said controller operatively connected to provide said control signal to said actuator; a second antenna connected to said controller and surrounding a vehicle compartment. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An antenna keyless entry system for operating a vehicular door lock device between a first locking position and a second unlocking position, comprising:
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an actuator operating said lock device between said first and second positions in response to a control signal; a pocket-portable transmitter producing a radio signal containing a unique code identifying the transmitter, said transmitter having a first loop antenna; a controller receiving said radio signal and comparing said unique code contained in said radio signal with a preset code therein, and producing said control signal when said unique code matches said preset code; second antenna connected to said controller and surrounding a vehicle compartment; and means for detecting keyless operation of said keyless entry system which operates said door lock to said first locking position and alarm means attached to the vehicle, repeatedly triggering said transmitter, for detecting when said transmitter is locked in the vehicle by detecting said radio signal from said transmitter, and in such cases for producing an alarm. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification