Smart keyless system control unit
First Claim
1. A control unit of a smart keyless system comprising an on-vehicle system mounted on a vehicle and a portable unit which are configured to achieve wireless communication, wherein the on-vehicle system includes a sender which sends a request signal, a receiver which receives an ID signal sent by the portable unit which has received the request signal, and a control means which commands the sender to send the request signal when a predetermined condition is met and controls at least one of door lock/unlock and engine start permission when the authentication of the ID signal received by the receiver succeeds, the vehicle is provided with an alternator which generates an output at least when an engine is running and feeds the output to electrical components arranged in a vehicle compartment and/or near the vehicle compartment via a power supply harness, and the control means commands the sender to send the request signal at least when the engine is running and gives a predetermined alarm when the authentication of the ID signal received by the receiver does not succeed, and further includes a reduction control part which reduces the output of the alternator when the sender sends the request signal.
1 Assignment
0 Petitions
Accused Products
Abstract
When a predetermined condition is met while the engine is running (S1→yes), the output of an alternator is reduced (S2). Then, a request signal which requires a response from a portable unit is delivered in the vehicle and an ID signal output from the portable unit in response to the request signal is received. Based on the received signal, a judgment is made whether or not the particular portable unit is present in the vehicle (S3). If it is judged that the portable unit is not present in the vehicle (S4→no), an alarm is given (S5). By so doing, the influence of electromagnetic noise caused by surge noise of the alternator is avoided to allow detection of the portable unit in the vehicle with accuracy, thereby reducing the possibility of causing an erroneous alarm.
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Citations
6 Claims
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1. A control unit of a smart keyless system comprising an on-vehicle system mounted on a vehicle and a portable unit which are configured to achieve wireless communication, wherein
the on-vehicle system includes a sender which sends a request signal, a receiver which receives an ID signal sent by the portable unit which has received the request signal, and a control means which commands the sender to send the request signal when a predetermined condition is met and controls at least one of door lock/unlock and engine start permission when the authentication of the ID signal received by the receiver succeeds, the vehicle is provided with an alternator which generates an output at least when an engine is running and feeds the output to electrical components arranged in a vehicle compartment and/or near the vehicle compartment via a power supply harness, and the control means commands the sender to send the request signal at least when the engine is running and gives a predetermined alarm when the authentication of the ID signal received by the receiver does not succeed, and further includes a reduction control part which reduces the output of the alternator when the sender sends the request signal.
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6. A control unit of a smart keyless system comprising an on-vehicle system mounted on a vehicle and a portable unit which are configured to achieve wireless communication, wherein
the on-vehicle system includes a sender which sends a request signal, a receiver which receives an ID signal sent by the portable unit which has received the request signal, and a CPU which commands the sender to send the request signal when a predetermined condition is met and controls at least one of door lock/unlock and engine start permission when the authentication of the ID signal received by the receiver succeeds, the vehicle is provided with an alternator which generates an output at least when an engine is running and feeds the output to electrical components arranged in a vehicle compartment and/or near the vehicle compartment via a power supply harness, and the CPU commands the sender to send the request signal at least when the engine is running and gives a predetermined alarm when the authentication of the ID signal received by the receiver does not succeed, and commands an alternator ECU to reduce the output of the alternator when the sender sends the request signal.
Specification
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- Resources
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Current AssigneeMazda Motor Corporation
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Original AssigneeMazda Motor Corporation
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InventorsHamada, Yasushi
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Application NumberUS11/199,205Publication NumberTime in Patent OfficeDaysField of SearchUS Class Current340/10.100CPC Class CodesB60R 25/00 Fittings or systems for pre...B60R 25/245 where the antenna reception...
