Smart keyless entry system
AssigneeMazda Motor Corporation
InventorYasushi HAMADA
Life of this patent
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Abstract
A transmitting antenna to transmit a request signal in a vehicle compartment is disposed off the center line of the vehicle compartment in a vehicle width direction. The output strength of the request signal transmitted by the transmitting antenna is switched in such a manner that a receivable output range of the request signal by a portable device reaches one of both doors which is equipped with one of access switches which has been operated. Accordingly, it can be properly recognized whether the portable device is located inside the vehicle compartment or outside the vehicle compartment even if the transmitter to transmit the request signal in the vehicle compartment is disposed off the center line of the vehicle compartment in the vehicle width direction.
Claims4
A smart keyless entry system, comprising:
- switches provided at outer faces of both-side doors of a vehicle;
- an onboard device operative transmit a request signal in response to operation of the switches;
- a portable device operative to transmit a receipt-acknowledgement signal in response to receiving the request signal;
- an onboard control device to be activated by the onboard device in response to receiving the receipt-acknowledgment signal,
- wherein said onboard device comprises a vehicle-inside transmitter to transmit the request signal in a vehicle compartment, the vehicle-inside transmitter comprises a switching transmitter which is disposed at a specified position which is off the center line of the vehicle compartment in a vehicle width direction, and the onboard device is configured so as to switch an output strength of the request signal transmitted by the switching transmitter in such a manner that a receivable output range of the request signal by said portable device reaches one of the doors which is equipped with the switch which has been operated.
Dependencies are inferred from the claim text.