Smart entry system and method

• US 7,916,021 B2
• Filed: 08/13/2008
• Issued: 03/29/2011
• Est. Priority Date: 08/13/2008
• Status: Expired due to Fees

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Lickfelt, Brian K., DiSalvo, Jason D.
• Primary Examiner(s): TWEEL JR, JOHN ALEXANDER
• Application Number:
  US12/191,143
• Publication Number:
  US 20100039221A1
• Time in Patent Office: 958 Days
• Field of Search: 340/571, 340/5.72, 340/5.61, 340/430, 340/426.13, 340/426.17, 340/545.1, 340/539.23
• US Class Current: 340/571
• CPC Class Codes: B60R 25/245 where the antenna reception area plays a role
• CPC Class Codes: B60R 25/246 characterised by the challenge triggering
• CPC Class Codes: G07C 2009/00333 and the lock having more than one limited data transmission ranges
• CPC Class Codes: G07C 2009/00507 keyless data carrier having more than one function
• CPC Class Codes: G07C 2209/63 Comprising locating means for detecting the position of the data carrier, i.e. within the vehicle or within a certain distance from the vehicle
• CPC Class Codes: G07C 9/00309 operated with bidirectional data transmission between data carrier and locks

Abstract

A smart entry system and method includes at least one actuating device for operation of at least two vehicle functions, an on-board transmitter for sending request signals to a portable device, and an on-board receiver for receiving an identification signal from the portable device. The on-board transmitter sends a first request signal within a first search field when the at least one actuating device is subjected to a first actuating operation for initiating a first vehicle function. A second request signal is sent within a second search field when the at least one actuating device is subjected to a second actuating operation for initiating a second vehicle function. The first search field varies relative to the second search field.

Claims

1. A smart entry system for a vehicle, comprising:

at least one actuating device for operation of at least two vehicle functions;

an onboard transmitter for sending request signals to a portable device, said onboard transmitter sending a first request signal within a first search field when said at least one actuating device is subjected to a first actuating operation for initiating a first vehicle function and sending a second request signal within a second search field when said at least one actuating device is subjected to a second actuating operation for initiating a second vehicle function, said first search field varying relative to said second search field wherein said first actuating operation and said first vehicle function correspond to powered opening of a closure of said vehicle and said second actuating operation and said second vehicle function corresponding to powered closing of said closure; and

an onboard receiver for receiving an identification signal from said portable device.

2. The smart entry system of claim 1 wherein said first and second search fields are adjacent said closure, said second search field larger than said first search field.

3. The smart entry system of claim 2 wherein said at least one actuating device is an unlock/open switch and a close/lock switch, said first actuating operation is actuating said unlock/open switch to initiate said first vehicle function and said second actuating operation is actuating said close/lock switch to initiate said second vehicle function, said first vehicle function is unlocking and opening said closure and said second vehicle function is closing and locking said closure.

4. The smart entry system of claim 3 wherein said closure is a powered tailgate and said unlock/open switch corresponds to powered unlocking and opening of said powered tailgate and said close/lock switch corresponds to powered closing and subsequent locking of said powered tailgate.

5. The smart entry system of claim 4 wherein said onboard transmitter is mounted in a bumper of said vehicle disposed below said powered tailgate.

6. The smart entry system of claim 5 wherein said transmitter includes a single antenna for transmitting said first and second request signals, power to said single antenna provided at a first level for sending said first request signal within said first search field and provided at a second, higher level for sending said second request signal within said second search field.

7. The smart entry system of claim 4 wherein said close/unlock switch is positioned near a distal edge of said tailgate.

8. The smart entry system of claim 1 further including said portable device, which includes:

a portable receiver for receiving said request signals, including said first request signal and said second request signal; and

a portable transmitter for sending said identification signal.

9. The smart entry system of claim 1 further including:

a controller commanding said onboard transmitter to send said first signal within said first search area when said at least one actuating device is subjected to said first actuating operation and commanding operation of a first operation when said onboard receiver receives said identification signal within a first prescribed period after transmission of said first search signal, said controller commanding said onboard transmitter to send said second signal within said second search area when said at least one actuating device is subjected to said second actuating operation and commanding operation of a second operation when said onboard receiver receives said identification signal within a second prescribed period after transmission of said second search signal.

10. The smart entry system of claim 9 wherein said first actuating operation corresponds to opening a closure and said first operation includes powered unlocking of said closure and powered opening of said closure, and wherein said second actuating operation corresponds to closing said closure and said second operation includes powered closing of said closure and powered locking of said closure.

11. A smart entry method for a vehicle, comprising:

sending a first request signal within a first search field when a first actuating operation occurs;

receiving an identification signal within a first prescribed time after sending said first request signal from a portable device located within said first search field;

actuating a first vehicle function upon receipt of said identification signal within said first prescribed time, wherein the first vehicle function includes powered opening of vehicle closure;

sending a second request signal within a second, larger search field when a second actuating operation occurs;

receiving a second identification signal from said portable device located within said second search field within a second prescribed time after sending said second request signal; and

actuating a second vehicle function upon receipt of said second identification signal within said second prescribed time, wherein the second vehicle function includes powered closing of a vehicle closure.

12. The smart entry method of claim 11 wherein said first vehicle function includes powered unlocking and powered opening of a vehicle closure and said second vehicle function includes powered closing and powered locking of said vehicle closure.

15. The smart entry method of claim 11 wherein said first actuating operation includes actuating an unlock/open switch on a vehicle closure, and wherein said second actuating operation includes actuating a close/lock switch on said vehicle closure.

16. The smart entry method of claim 11 wherein receiving said first and second identification signals includes receiving RF communications from a portable device.

13. A smart entry method for a vehicle, comprising:

sending a first request signal within a first search field when a first actuating operation occurs;

receiving an identification signal within a first prescribed time after sending said first request signal from a portable device located within said first search field;

actuating a first vehicle function upon receipt of said identification signal within said first prescribed times

sending a second request signal within a second, larger search field when a second actuating operation occurs;

receiving a second identification signal from said portable device located within said second search field within a second prescribed time after sending said second request signal; and

actuating a second vehicle function upon receipt of said second identification signal within said second prescribed time,

wherein sending said first request signal includes powering an antenna to a first level for transmitting a low level frequency within said first search area, and wherein sending said second request signal includes powering said antenna to a second, higher level for transmitting a low level frequency within said second, larger search area.

14. The smart entry method of claim 13 wherein said first vehicle function includes powered unlocking and powered opening of a vehicle tailgate and said second vehicle function includes powered closing and powered locking of said vehicle tailgate, and wherein said antenna is disposed on a vehicle body below a lower edge of said vehicle tailgate when in a closed position.

17. The smart entry method for a vehicle, comprising;

receiving a first actuation signal indicating that a first actuating operation is occurring;

transmitting a first request signal within a first search field upon receipt of said first actuation signal;

determining whether a portable device is located within said first search field by receiving an identification signal from said portable device located within said first search field within a first prescribed time after sending said first request signal;

sending a first vehicle function command signal after receiving said identification signal within said first prescribed time;

receiving a second actuation signal indicating that a second actuation operation is occurring;

transmitting a second request signal within a second search field upon receipt of said second actuation signal;

determining whether said portable device is located within said second search field by receiving another identification signal from said portable device located within said second search field within a second prescribed time after sending said second request signal; and

sending a second vehicle function command signal after receiving said another identification signal within said second prescribed time,

wherein said first vehicle function includes powered unlocking and powered opening of a vehicle tailgate and said second vehicle function includes powered closing and powered locking of said vehicle tailgate.

18. The smart entry method of claim 17 wherein said first search field extends from a rear end of said vehicle to a first distance spaced apart from said rear end and said second search field extends from said rear end of said vehicle to a second, greater distance spaced apart from said rear end.

19. A smart entry system for a vehicle, comprising:

at least one actuating device for operation of at least two vehicle functions;

an onboard transmitter for sending request signals to a portable device, said onboard transmitter sending a first request signal within a first search field when said at least one actuating device is subjected to a first actuating operation for initiating a first vehicle function and sending a second request signal within a second search field when said at least one actuating device is subjected to a second actuating operation for initiating a second vehicle function, said first search field varying relative to said second search field; and

an onboard receiver for receiving an identification signal from said portable device,

wherein said transmitter includes a single antenna for transmitting said first and second request signals, power to said single antenna provided at a first level for sending said first request signal within said first search field and provided at a second, higher level for sending said second request signal within said second search field.