DE10108578A1 - System and method for function control with data transmission for antenna selection - Google Patents

Abstract

A system (10) remotely controls a vehicle function. The system (10) includes a plurality of antennas (48A-48F), each operable to transmit a request signal and a request signal through an associated area on the vehicle (12). A controller (34) controls the antennas (48A-48F) and causes the request signals to be transmitted in a sequence. A transponder (44) of the system (10) receives a request signal if the transponder is located in an assigned area and sends out a first response signal which provides a presence indicator. The controller (34) determines which antenna (e.g. 48A) is associated with the event that the transponder (44) is transmitting the first response signal and causes the particular antenna to transmit its query signal. The transponder (44) receives the interrogation signal and sends out a second response signal which provides an identification. The controller (34) causes the vehicle function to be performed in response to the transponder (44) sending out the second response signal.

Description

Field of the Invention

The present invention relates to passive remote control systems, and specifically refers to systems that have a variety of query include antennas.

Background of the Invention

Passive remote control systems are known. An example of a passive Remote control system is a passive engine start system for a driver convincing. An authorized person (e.g. an owner of the vehicle) carries one portable transmitter or transponder. If the authorized person is in a vehicle-based transcei asks the assigned vehicle ver (transmitter / receiver) or transponder the portable transponder. In response to the query, the portable transponder emits a signal or from, which provides a security code identification.

The vehicle-based transponder determines whether the supplied identification is authentic. If the correct identification is provided, an ignition Component for the vehicle engine put into operation without the person manually turns a key in an ignition lock, manually opens a code a vehicle touchpad or the like. This is how the authori operates only person a starter button or switch to the engine to start.

Another example design of a passive remote control system is a passive vehicle access system. Such a system allows automa unlocking a vehicle door or something similar, for an authori person who wishes to gain access to the vehicle. I agree said the authorized person does not have to manually key in a key  Turn the vehicle lock, manually operate a handheld transmitter or manually enter a code on a vehicle touchpad.

Similar to the passive vehicle starting system, the passive access includes system an identification transceiver or transponder that is connected to the autho person, and a base transceiver or transpon the one that is attached to the vehicle. The vehicle-based transponder queries the portable transponder and, in response to the query, returns the portable transponder emits a signal that contains a security code Identification delivers. Responsive to the reception of the authentic The vehicle-based Transcei unlocks the signal providing the security code ver the vehicle door. So the authorized person can simply pull a door handle press and open the door.

Some known passive vehicle remote control systems are becoming common genome as contactless identification and authentication systems men. Some known passive vehicle remote control systems have been used a radio frequency (HF) transmission between a portable transponder and a vehicle-based transponder. Such systems are often referred to as RF identification systems referenced.

It is more typical within a passive vehicle remote control system wise, the authorized person in close proximity to the part of the vehicle that is remotely controlled. For example, should the authorized person is relatively close to a passive vehicle access system located on the assigned vehicle before a vehicle door unlocks becomes. To have the authorized person in close proximity to the vehicle unlocking the vehicle door will help reduce the possibility that an authorized person would not be aware that a vehicle door was unlocked passively.

In a passive vehicle remote control system, the RF transmission used, precise range control is difficult to achieve  due to the possibilities of signal reflection and multipath propagation Zung. In addition, the RF transmission field strength falls as a function of the order inversion of the square of the distance from the transmission source.

A transmission or communication between a base transceiver and a portable transceiver occurs must meet the regulations that Frequency and maximum strength of the delivered signal concern. In the verei States, the Federal Communications Commission ("FCC") lays down such Regulations. Remote control overruns in the United States support for passive access systems and the like typically in one Part of the RF spectrum used by the FCC for unlicensed transmission facilities is allocated. Typically, the one that occurs is Transmission exchange within the ultra high frequency part of the HF Spectrum.

Those of ordinary skill in the art will perceive that in the RF spectrum Noise may be present. Interferences caused by the noise zen (e.g. RF interference) can adversely affect some communication systems influence lig. The extent of the interference can reach the level of the com communication interruption increase. It is possible that some types passive remote control systems adversely affected by interference become. The result would be that the authorized person would not accept it would have a passive remote control of the vehicle function. For the case The authorized person would not have play in a passive access system the convenience of passive access (e.g., the authorized Person must turn a key in a lock, manually turn one Need to enter code on a touchpad, or similar).

In a known system, the use of multiple antennas sees that Coverage of multiple areas or areas. In fact, she sees Variety of antennas provide increased coverage for signals from one vehicle-based transponder arrangement before and an increased reception Cover for signal output from a portable transponder. This  leads to a concept that coverage should be provided for areas within which a portable transponder can be located at a time when an authorized operator expects remote control tool function would be executed.

In one example of a passive engine starting system, it is possible that a portable transponder at any of several locations within of a vehicle interior, if the operator desires the Start vehicle engine. For example, the transponder can be in one The authorized person's coat or handbag, and the coat or handbag can be in a back seat of the vehicle be located. An antenna of a vehicle-based transponder arrangement, which has an interrogation / reception area which is in an area around the vehicle Ritz is limited, might not be able to deal with that in the To communicate in the rear seat area of the portable transponder.

If several antennas of a vehicle-based transponder arrangement can be used to provide coverage of multiple areas it is possible that interrogation / reception coverage areas overlap. If coverage areas overlap it is possible that together falling interrogation signal outputs of two or more on one vehicle located antennas collide. Therefore, it is typically beneficial, ever to limit the query attempt to only one antenna at a time Zen.

It is possible to drive each of a plurality of antennas sequentially tool-based transponder arrangement to allow trying to carry the trag query the transponder. However, it should be noted that the time that be is required to allow multiple antennas, a sequential query to try to add to the number of antennas in the vehicle-based trans ponder arrangement is related.  

Summary of the invention

In one embodiment, the present invention provides a system for Remote control of vehicle functions. The system includes a variety of query means. Each query means can be operated to a query to emit or deliver the signal signal through a vehicle area which is assigned to a corresponding query means. The system includes portable identification means for receiving the interrogation signals. The trag The identification means emit a response signal that is responsive provides an identification when one of the query signals is received. medium receive the response signal and operate the vehicle functions based on the receipt of the response signal. Means determine in what chem vehicle area the portable means are located and operate the associated polling means to send out the one polling signal.

In another embodiment, the present invention provides a sy system for remote control of a vehicle function. The system includes one Variety of query means. Any query means can be operated to to send out an interrogation signal through a vehicle area, which a corresponding query means is assigned. The system includes portable ones Identification means for receiving one of the query signals. The portable Identification means send out a response signal in response to the Receiving one of the query signals provides an identification. Received medium response signal and perform the vehicle functions appropriately receiving the response signal. Determine means before sending one of the interrogation signals which of the interrogation means is to be operated in order to to send out his interrogation signal so that the interrogation signal emitted is received in the portable identification means.

In another embodiment, the present invention provides a sy system for remote control of a vehicle function. The system includes one Variety of query means. Any query means can be operated to to send out an interrogation signal. Each interrogation signal can be in one  corresponding vehicle area received corresponding query means become. The system includes portable identification means for receiving one of the interrogation signals if the identification means in the correspond the assigned area is located, and the corresponding query medium that send out a query signal. The portable interrogators the a response signal, which is in response to the reception of one Query signal provides an identification. Means receive the response signal and perform the vehicle function in response to the reception of the Ant word signal. Means determine which of the plurality of query means is to be operated in order to receive a query signal for reception by the To deliver identification means and operate the one query means to the send out a query signal.

In another embodiment, the present invention provides a sy system for remote control of a vehicle function. The system includes one Variety of antennas. Each antenna can be operated to make a request signal and a query signal by an assigned vehicle area send out. The system includes a transponder for receiving the Request signals and for sending a first response signal, the one Presence notification in response to receipt of one of the requests gnale delivers. The transponder receives the query signals and sends one second response signal which, in response to receipt of one of the Ab question signals provides an identification. A control causes the on question signals are sent out in a sequence. The control be agrees which antenna is assigned to the event that the transponder sends out the first response signal. The control causes the be tuned antenna sends out its query signal and performs the vehicle function off, in response to the fact that the transponder when receiving the out sent query signal sends out the second response signal.

According to yet another embodiment, the present invention provides a transponder for a system that controls a vehicle function remotely. The transponder includes means for receiving any one of several  Request signals sent out by corresponding vehicle areas become. Means emit a first response signal that a presence display for a corresponding area in response to the reception one of the request signals. Means receive any of several Interrogation signals through the corresponding areas of the vehicle interior be sent out. Means send out a second response signal, which provides identification in response to receipt of the ent speaking area associated query signal.

In accordance with yet another embodiment, the present invention provides an understanding Method for remote control of a vehicle function. It is a multitude provided by query means. Any query means can be operated to assigning a signal to a corresponding one of the interrogation means area. A determination is made in which A portable identification means is located in the vehicle area. The assigned Neten polling means are actuated to send out a polling signal. The query signal is received on the portable identification means. A response signal is emitted from the portable identification means det, an identification in response to receipt of the query signal on delivers. The response signal is received. The vehicle function turns on executed in response to the receipt of the response signal.

According to yet another embodiment, the present invention contemplates Method for remote control of a vehicle function. A variety of Request signals are sent in a sequence through assigned areas on the Vehicle sent out. A request signal is sent to one of the assigned areas located transponders received. A first answer signal is emitted by the transponder, which is responsive to the Receipt of a request signal provides a presence indicator. It will made a determination using the first response signal, in which area the transponder is located. A query signal that the Area assigned in which the transponder is located is emitted det. The query signal is received on the transponder. A second  Response signal is sent out by the transponder in response to the receipt of the one interrogation signal provides identification. The driving The witness function becomes responsive to the second response being sent out gnals carried out by the transponder.

Brief description of the drawings

The foregoing and other features and advantages of the present Invention will occur to those skilled in the art to which this Er Finding obviously relates to who reads the following description the, with reference to the accompanying drawings, in which:

Fig. 1 is a schematic representation of a first embodiment ge according to the present invention and shown with an associated vehicle;

Fig. 2 is a functional block diagram of a controller shown in Fig. 1;

Fig. 3 is a flowchart for a process performed in the controller shown in Fig. 2;

Fig. 4 is a functional block diagram of an identification transponder shown in Fig. 1;

FIG. 5 is a flow chart for a process carried out in the transponder shown in FIG. 4;

Fig. 6 is a schematic representation of a second embodiment of a system according to the present invention and shown with egg nem associated vehicle;

Fig. 7 is a schematic representation of a third embodiment of a system according to the present invention and shown with an associated part of a vehicle; and

Fig. 8 is a schematic diagram showing a functional embodiment of a system according to the present invention.

Description of preferred embodiments

A system 10 for remote control of a vehicle function in accordance with the present invention and an associated vehicle 12 are shown in FIG. 1. Vehicle 12 includes an engine 14 (e.g., an internal combustion engine). The vehicle 12 also includes a vehicle interior 16 (e.g., a passenger compartment) in which an operator (not shown) is located while the operator controls the vehicle. In the example shown in FIG. 1, the vehicle interior 16 has a front seat area 18 in which a driver seat 20 and a front passenger seat 22 are located. The interior 16 also has a rear seat area 24 in which a rear seat 26 is located.

In the example shown in FIG. 1, the function that is remotely controlled by system 10 is an engine ignition enable function or simply an engine start function. The system 10 includes a starter control component 28 that provides an enable signal 30 to a suitable component (e.g., engine ignition) of the vehicle 14 that allows the engine to be started. Furthermore, the function of enabling the vehicle engine 14 to allow it to be on is passive for the operator who is an authorized person. Specifically, the release of the vehicle engine 14 to start it is accomplished without the need for the authorized person to perform an activity that indicates the person's entitlement.

The authorized person does not have to insert a key and turn it in an ignition lock or enter a security code in a code input device. If anything, the authorized person need only request that the engine 14 be started. Such a start request function is provided in the example shown by a start request input device 32 . An example of a starter request input device 32 is a push button or switch device that is manually operated when the authorized person is in the driver's seat 20 and the person is ready to start the vehicle engine 14 .

A controller 34 of the system 10 is operatively connected 36 to the starter control component 28 and is operatively connected to the starter request input device 32. When the authorized person inputs a start request to the start request input device 32 , the controller 34 functions to determine to make whether the authorized person is shown as present. If the determination is affirmative (ie, the authorized person is shown to be present), then the ignition is released and the engine 14 is started.

The controller 34 is part of a vehicle-based transponder arrangement 42 which communicates with an identification transponder 44 which is assigned to the authorized person in order to determine the presence and authenticity (authenticity) of the identification transponder. The presence of the identification transponder 44 and the provision of a correct identity to the vehicle-based transponder arrangement 42 indicates that the authorized person is present. The identification transponder 44 may take the form of a badge or badge, button, label or key fob that the authorized person wears in their clothing pocket, in their handbag or attached to their key chain or other personal item. Therefore, the identification transponder 44 is a portable receiver that is carried by the authorized person. From here on, is simply reference 44 taken as ID transponders on the identification transponder 44th

With respect to the vehicle-based transponder arrangement 42, the arrangement comprises a plurality of magnetic antennas (e.g. 48 A -48 F). Each magnetic antenna (z. B. 48 A) is located at a predefined location (z. B. a door) of the vehicle 12 and sends out magnetic signals (z. B. 50 A), the certain assigned areas (z. B. part of the Vorderitzbe rich 18 ) of the vehicle interior 16 . Preferably, each magnetic antenna (e.g. 48 A) is a short cylindrical coil that can be electrically energized to provide a field pattern of the associated transmitted signals (e.g. 50 A). In one example, the field pattern is a torus field pattern. The magnetic signals are preferably emitted at a low frequency ("LF") and are therefore referred to here as LF signals.

In the example shown in FIG. 1, six magnetic antennas 48 A- 48 F are located in the vehicle 12 . A first magnetic antenna 48 A is located in a front passenger side door 52 and transmits LF signals 50 A that penetrate a vehicle area that includes the front passenger seat 22 . A second magnetic antenna 48 B is located in a rear driver's side door 54 and sends out LF signals 50 B that penetrate a vehicle area that includes a first side portion of the rear seat area 24 . A third magnetic antenna 48 C is located on or near a parcel shelf 56 of the vehicle 12 and transmits LF signals 50 C that penetrate a vehicle area that includes a central portion of the rear seat area 24 .

A fourth magnetic antenna 48 D is located in a rear driver side door 58 and transmits LF signals 50 D that penetrate a vehicle area that includes a second side portion of the rear seat area 24 . A fifth magnetic antenna 48 E is placed in a front driver's side door 60 and sends out LF signals 50 E which penetrate a vehicle region including the driver's seat 20 . A sixth magnetic antenna 48 F is located in a rearview mirror 62 of the vehicle 12 and transmits LF signals 50 F that penetrate a central part of the front seat area 18 .

The LF signals 50 A- 50 F, which are emitted by the first-sixth magnetic antennas 48 A- 48 F, are to be received by the ID transponder 44 . An LF signal (e.g. 50 A) is received by the ID transponder 44 if the ID transponder is in the assigned area through which the LF signal penetrates. Therefore, the LF signals are a first type of communication between the vehicle-based transponder arrangement 42 and the ID transponder 44 . Each of the first-sixth magnetic antennas 48 A- 48 F is operatively connected to the controller 34 connected 66 A -66 F, and the controller controls the magnetic antennas to transmit the LF signals 50 A- 50 F. The magnetic antennas 48 A- 48 F are excited accordingly to transmit their corresponding LF signals 50 A- 50 F in response to electrical excitation signals provided by the controller 34 .

As a second communication embodiment between the vehicle-based transponder arrangement 42 and the ID-transponder 44 , the ID-transponder transmits signals 68 and the vehicle-based transponder system comprises an antenna 70 for receiving the signals from the ID-transponder. The antenna 70 is functionally connected to the controller 34 a related party 72 . In the preferred embodiment, the signals 68 from the ID transponder 44 to the vehicle based transponder assembly 42 are radio frequency ("HF") signals. Therefore, the signals 68 are referred to as RF signals. The RF signals 68 are received on the antenna 70 , regardless of the position of the ID transponder 44 in the vehicle interior 16 .

With respect to the LF signals 50 A- 50 F which are emitted by the magnetic antennas 48 A- 48 F, a kind of LF signal which is emitted by each magnetic antenna is an interrogation signal which is generated by the ID Transponder 44 is to be received. In response to the receipt of an interrogation signal, the ID transponder 44 emits a type of RF signal 68 , which is a request to release the engine ignition. The release request signal provides a suitable security code which identifies the ID transponder and therefore identifies the carrier of the ID transponder as the person authorized to start the engine 14 of the vehicle 12 .

34 in response to the receipt of the RF verifi release request signal decorates the control of the vehicle-based transponder assembly 42, the supplied security code identification. When the identification is verified, the controller 34 causes the starter control component 28 to release the ignition of the engine 14 . Thus, the authorized person need only operate the starter request input device 32 (e.g., press a push button) to cause the engine 14 of the vehicle 12 to start. Therefore, it should be understood again that the authorized person does not have to manually turn a key in an ignition, manually operate a handheld transmitter, or manually enter a code on a touch pad on the vehicle, or the like. Generally speaking, the vehicle-based transponder assembly 42 and the ID transponder 44 are in a communication arrangement to perform an interrogation and automatic ignition release sequence for the authorized person.

It should be noted that a constant emission of some or all of the LF signals 50 A- 50 F from the magnetic antennas 48 A- 48 F would only consume excessive amounts of electrical energy (e.g. a vehicle battery load). Strictly speaking, communication between the vehicle-based transponder arrangement 42 and the ID transponder 44 only has to occur when the vehicle engine 14 is about to start. Therefore, a suitable ignition or initiation trigger can be used to initiate communication. For example, manual actuation of the start request input device 32 could be used to initiate communication. Other options for the initiation trigger include sensing the opening of a vehicle door (e.g., 60 ).

It should also be noted that the ID transponder 44 will only transmit the RF release request signal if the ID transponder is in the associated area through which an LF interrogation signal passes. Sending out an LF query signal and waiting for a possible RF release request signal in response requires a certain time. Specifically, a complete LF interrogation signal must be received by the ID transponder 44 , and then a complete RF release request signal must be transmitted by the ID transponder.

The controller 34 has to wait for a certain period of time for a possible RF release request signal response.

Therefore, it should be noted that the sequencing of the magnetic antennas to corresponding LF interrogation signals to provide 48 O 48 F, sequentially and await a possible RF release request response (z. B. initially un known whether the ID transponder 44 assigned in the Area through which the interrogation signal penetrates) would be time consuming. Nevertheless, it should be noted that such sequencing would ultimately "find" the ID transponder 44 located in the vehicle interior 16 , the delay that could be associated with such a sequence full of query signals could become a nuisance for the authorized person. Typically, it is desirable that a vehicle engine respond immediately when ignition of the engine is required.

It should be noted that the areas through which the LF signals 50 A- 50 F pass from the corresponding magnetic antennas 48 A- 48 F may overlap. For example, Fig. 1 shows a significant overlap of the signal ranges for the first and sixth magnetic antennas 48 A and 48 F, the second and third magnetic antennas 48 B and 48 C, the third and fourth magnetic antennas 48 C and 48 D and the fifth and sixth magnetic antennas 48 E and 48 F. Further, it should be noted that there is a possibility that if LF signals 50 A- 50 F are transmitted simultaneously from magnetic antennas that have overlapping signal areas, some kind of interference can occur.

When the ID transponder 44 is in the vehicle 16 , the ID transponder will be located in the signal area associated with one or more of the plurality of magnetic antennas (e.g., 48 A). However, it should be noted that the vehicle-based transponder arrangement 42 does not initially “know” in which of the signal areas of the ID transponder 44 is located. Furthermore, due to the possibility of interference between LF signals 50 A- 50 F that have overlapping areas, it would be unwise to actuate all magnetic antennas 48 A- 48 F simultaneously to transmit their associated LF interrogation signals.

Therefore, according to the present invention, the controller 34 of the vehicle-based transponder assembly 42 causes the magnetic antennas 48 A- 48 F to transmit LF request signals of a relatively short duration as another form of the LF signals 50 A- 50 F. The LF request signals occur in front of an LF interrogation signal. The receipt of an LF request signal by the ID transponder 44 causes the ID transponder to deliver an HF request answer signal which only indicates the presence of the ID transponder in an assigned area in the vehicle interior 16 . For example, the LF request signal is a short continuous pulse and the RF request answer signal from ID transponder 44 is a short HF pulse. The RF request response signal is another form of the RF signals 68 and is a first RF signal that is a transmission of the ID transponder 44 .

In one embodiment, the controller 34 sequentially excites the magnetic antennas 48 A- 48 F so that each magnetic antenna sequentially transmits the associated LF request signal to extend through the associated area of the vehicle interior 16 . As shown in the example of FIG. 1, only the LF request signal is currently being sent out by the first magnetic antenna 48 A, and the other LF request signals (which are shown in broken lines) are being sent in other time periods. When the ID transponder 44 responds to an LF request signal with an RF request response signal, the controller 34 identifies the magnetic antenna (e.g. 48 A) that has transmitted the LF request signal that caused the RF request response signal.

It should be noted that in an alternative embodiment, data exchange takes place during the request signal / request answer signal sequence. For example, the LF request signal from each magnetic antenna (e.g., 48 A) provides data as an excitation rather than simply relying on the presence of the LF request signal as a continuous signal as an excitation. The data may include an identification of the vehicle that is used to prevent an unnecessary request response signal from an ID transponder of another system.

In accordance with the present invention, the identified magnetic antenna (e.g. 48 A) is used to transmit a full LF interrogation signal. Since the response to the LF request signal indicates that the ID transponder 44 is receiving LF signals from the identified magnetic antenna (e.g. 48A ), the LF request signal is received by the ID transponder. The ID transponder 44 in turn supplies the release request signal (e.g. the security code identification) as a second signal to the HF antenna 70 / controller 34 . Upon verification of the identification provided by the release request signal, the controller 34 enables the engine ignition as described above.

FIG. 2 illustrates portions of controller 34 that sequentially send the LF request signal (s) from the magnetic (LF) antenna (s) 48 A- 48 F and send out an LF request signal from the selected one magnetic antenna. A signal from the start request input device 32 is provided to an RF receive circuit 74 as a wake up command to enable the RF receive circuit to receive RF (ie, request response and release request) signals from the ID transponder 44 received. The enable request input signal from the input device 32 is also provided to a magnetic (ie LF) antenna sequencer 76 .

The antenna sequencer 76 is operatively connected 78 to an LF antenna activation control section 80. The activation control section 80 includes an LF transmission circuit for activating the magnetic antennas 48 A- 48 F. In response to certain control signals from the antenna sequencer 76 , the activation control section 80 sequentially sends electrical stimuli supply signals to the magnetic antennas 48 A- 48 F, which cause the magnetic antennas to sequentially transmit the corresponding LF request signals.

The antenna sequencer 76 and the activation control section 80 pass the antennas (e.g. from the first antenna towards antenna N, in the disclosed example the sixth antenna) until a request response signal is received by the ID transponder 44 . To end sequencing, controller 34 includes an antenna selection portion 82 that is operatively connected 84 to antenna sequencer 76 and operatively connected 86 to RF receive circuit 74 . The antenna sequencer 76 informs the antenna selection section 82 which magnetic antenna (e.g. 48A ) is currently being activated to transmit an LF request signal, and the RF reception circuit 74 provides the antenna selection section with an indication when an RF request answer signal is received.

When an RF request response signal is received, antenna selection portion 82 determines that the current magnetic antenna (e.g., 48A ) that is activated to transmit the LF request signal is the antenna that should be used for the full query sequence (ie the current antenna is selected). Accordingly, the antenna selection part 82 controls the antenna sequencer 76 to stop further sequencing the antennas to send out request signals. In addition, the antenna selection section 82 displays the selected magnetic antenna (e.g. 48A ) for a full interrogation communication section 88 that is operatively connected 90 to the antenna selection section.

The full query communication part 88 is functionally connected 92 to the activation control part 82 . Upon receipt of the information about the selected antenna, the full query communication part 88 provides a signal that provides a query command together with the information about the selected antenna to the activation control part 80 . The activation control part 80 in turn causes that only the selected magnetic antenna (z. B. 48A ) sends the query signal.

In response to the interrogation signal, the ID transponder 44 ( FIG. 1) provides the full interrogation response (ie, the identification) that is received at the RF antenna 70 and is delivered to the RF receiving circuit 74 ( FIG. 2). The information supplied via the interrogation answer signal is in turn supplied to a full response processing part 94 which is functionally connected 96 to the RF reception circuit 74 . In the full response processing part 94 , the contents of the release request signal are decoded, and the identification security code supplied is verified with a security code from a memory 98 of the controller 34 . If the identification is verified, the full response processing part 94 provides an appropriate signal to the starter control component 28 .

FIG. 3 shows a flow diagram for a process 100 that is executed in the controller 34 of FIG. 2. The process 100 ( FIG. 3) is started in step 102 and continues to step 104 . In step 104 , it is determined whether an ignition starter request has been received by the starter request input means 32 . If the determination at step 104 is negative (ie, a start request has not yet been received), process 100 loops to repeat the request from step 104 . If the determination in step 104 is affirmative (ie, a start request has been received), process 100 proceeds to step 106 . In step 106 , a variable N is set to 1. N is an identifier of an antenna that is currently being activated. In step 108 , the magnetic antenna N is activated for a short continuous pulse to deliver an LF request signal.

In step 110 , it is determined whether an RF request response signal is received. If the determination in step 110 is affirmative (ie, a query response is received indicating that the ID transponder 44 is in the assigned area for the activated antenna), the process 100 proceeds to step 112 . In step 112 , a full interrogation signal is sent to antenna N (ie, N is the selected antenna). In step 114 , the release request signal is processed and the ignition release is controlled (when the identification of the ID transponder 44 is verified). Upon completion of step 114 , process 100 loops back to step 104 .

If the determination in step 110 is negative (ie no request response is received, which indicates that the ID transponder 44 is not in an area assigned to the activated antenna), the process 100 proceeds to step 116 . In step 116, it is determined whether all of the antennas 48 A-48 F are sequentially energized to deliver its associated LF request signal. If the determination in step 116 is negative (ie all antennas have not yet been sequentially energized), process 100 proceeds to step 118 . In step 118 , the variable N is increased by one. Thus increasing the variable N causes the next sequential antenna to be selected. Upon completion of step 118 , process 100 proceeds to step 108 where the newly selected antenna N is activated to transmit the request signal.

If the determination in step 116 is affirmative (ie, all of the antennas 48 A-48 F were sequentially activated to their corresponding LF request signals to send out), then closes the controller 34 that the ID transponder 44 is not in the inner space 16 of the vehicle 12 is located, or at least not in an area which is assigned to one of the magnetic antennas 48 A- 48 F. After the affirmative determination in step 116 (all transformants that nen 48 A-48 F were tested with no response to any request signal), the process 100 proceeds from step 116 to step 104th Therefore, the authorized person must move the ID transponder 44 into one of the signal areas of the magnetic antennas 48 A- 48 F and actuate the occasion request input device 32 .

It is contemplated that a type of notification could be provided to the vehicle occupant that indicates that the vehicle-based transponder system has attempted but has not been able to locate the ID transponder 44 . The display is still see a notification to dispose the ID transponder 44 at a place where the transponder ID in the subsequent sequencing by the antennas 48 A-F can be "found" 48th

Referring to Figure 4, the structure of the ID transponder 44 is shown that allows the ID transponder to deliver a query response first and then a full query response. An LF (magnetic) antenna 124 is operatively connected 126 to an LF receiving circuit 128 . The LF receiving circuit 128 is in turn functionally connected 130 to a query processing part 132 and is functionally connected 134 to a query processing part 136 . The request processing part 132 is functionally connected 138 to an RF transmission circuit 140 . The request processing part 136 is also functionally connected 142 to an RF transmission circuit 140 .

When the LF antenna 124 / LF reception circuit 128 intercepts the pulse duration emp indicating a request signal, the LF reception circuit 128 supplies an excitation signal for the request processing part 132nd In response, the request processing section 132 sends out a short response excitation signal to the RF transmission circuit. The RF transmission circuit 140 in turn excites an RF antenna 144 operatively connected 146 to the RF transmission circuit and causes the RF antenna to transmit the request response signal.

In the example embodiment, a timer 148 is functionally connected 150 to the query processing part 132 and is also functionally connected 152 to the query processing part 136 . The timer 148 is started when the request processing part 132 operates upon a received LF request signal to measure a period of time in which the request processing part 136 should wait for the request signal. It should be noted that the timer 148 and its function can be omitted.

When the LF antenna 124 / LF receiving circuit 128 receives the interrogation signal, the information contained therein is supplied to the interrogation processing part 136 . The query processing part 136 accesses a security code identification from a memory 154 and delivers the identification in an encrypted message to the RF transmission circuit 140 . The RF antenna 144 is in turn stimulated to transmit the release request signal that provides the identification.

In reference to FIG. 5, a process 160 is shown, which is executed in the ID transponder 44 of Fig. 4. Process 160 ( FIG. 5) is started in step 162 and continues to step 164 . In step 164 it is determined whether an LF request signal (ie the short continuous pulse) is received. If the determination in step 164 is negative (ie, the ID transponder 44 is still waiting for a request signal), the process 160 loops back to repeat step 164 . If the determination in step 164 is affirmative (ie, a request signal is received), process 160 proceeds to step 166 . In step 166 , the short RF request signal is transmitted by the ID transponder 44 .

In step 168 , it is determined whether an LF interrogation signal is received. If the determination at step 168 is affirmative (ie, the query signal is received), process 160 proceeds to step 170 where the release request signal (ie, the identification) is sent out. Upon completion of step 170 , process 160 loops back to step 164 to await another request signal.

If the determination in step 168 is negative (ie, the ID transponder 44 is still waiting for the query signal after receiving the query signal), the process 160 proceeds from step 168 to step 172 . In step 172 it is determined whether a predetermined period of time in which the ID transponder 44 waits for the interrogation signal has expired. If the determination in step 172 is negative (ie, the time period has not yet expired), process 160 proceeds from step 172 to step 168 to query again whether the LF query signal is received. However, if the determination in step 172 is affirmative (ie, the time period has expired), the ID transponder 44 assumes that it is no longer appropriate to wait for a query signal and continues from step 172 to step 164 . The ID transponder 44 thus expects another request signal.

Although it is possible that areas in a vehicle interior through which LF signals penetrate can overlap and cause possible interference, it is contemplated that the signals from certain antennas are unlikely to overlap / interfere. Accordingly, the embodiment of system 210 shown in FIG. 6 is a variation of the embodiment of FIG. 1, but provides for simultaneous transmission of LF signals from a plurality of magnetic antennas. System 210 shown in FIG. 6 has many components that are similar to the corresponding components shown in FIG. 1. Identical reference numerals are used to identify the identical components. 1, the system 210 of Fig. 6 differs from the system 10 of FIG. Because by that which provides in FIG. 6, vehicle-based transponder 242 arrangement shown no sequential LF request signals from the magnetic antennas 48 A-48 F. Specifically, the controller 234 controls the antennas 48 A-48 F such that a plurality of LF request signals are simultaneously transmitted from.

In one example, two magnetic antennas are activated simultaneously to transmit their corresponding LF request signals. Fig. 6 shows the first and the fourth magnetic antennas 48 A and 48 D (in Fig. 6 with the indices "ACTIVE" identified), which are activated simultaneously to send out about their respective LF request signals. Other antenna pairs (e.g., the second and fifth antennas 48 B and 48 E and the third and sixth magnetic antennas 48 C and 48 F) are sequentially activated simultaneously.

The simultaneous activation of a large number of the magnetic antennas allows faster processing by providing request signals from the antennas, and thus faster identification of the ID transponder 44 by the vehicle-based transponder arrangement 242 . It is also contemplated that the LF request signals from magnetic antennas can provide antenna identification, and that the ID transponder 44 can provide the request response signal with an identification of which of the plurality of activated antennas caused the response. For example, the LF request signal emitted by each antenna may be somewhat unique, and the unique aspect may be repeated or mimicked back to the vehicle-based transponder assembly 242 by the ID transponder 44 .

It is also contemplated that specific identification among the currently active magnetic antennas may not be necessary. It is envisaged that the same set of antennas (eg. As the first and fourth magnetic antennas 48 A and 48 D) may be activated to their corresponding LF interrogation signals to send out when the ID of the transponder 44 in a assigned areas.

With reference to FIG. 7, an exemplary embodiment is shown which provides passive remote control of a further (ie other than the vehicle ignition) vehicle function. Specifically, a system 310 of the embodiment shown in FIG. 7 provides passive access to a vehicle 312 . A door 318 includes an interior 316 of the vehicle 312 . Therefore, door 318 is an entry cover for entry into vehicle interior 316 . A door lock mechanism (not shown) secures door 318 in a closed position, and door handle 320 is manually operable to operate the latch and open the door.

A door lock 322 prevents the locking mechanism from operating. Therefore, the door lock 322 is an access control component that controls access to the vehicle interior 316 . System 310 controls door lock 322 . Thus, an authorized person (not shown) does not have to insert and turn a key in a lock, or enter a security code in a code entry device, or the like. If anything, the authorized person need only reach for the door handle 320 and operate it.

A sensor 324 of the system 310 is adjacent to the door handle 320 to sense when a hand (not shown) reaches for the handle. A controller 328 of system 310 is operatively connected 330 to sensor 324 . When sensor 324 senses the hand reaching for handle 320 , controller 328 functions to make a determination of whether access to vehicle interior 316 should be allowed. If the determination is affirmative (ie the person reaching for the door handle is an authorized person), then door 318 is unlocked. Specifically, a signal is provided to a lock controller 332 which is operatively connected 334 to the controller 328 . The lock control 332 is in turn operatively connected 336 to the lock 322 to control the lock.

The controller 328 is part of a vehicle-based transponder arrangement 342 that can communicate with a portable ID transponder 344 . The presence of the ID transponder 344 in a particular vehicle area (e.g., an area adjacent to the vehicle) and the provision of a correct identity to the vehicle-based transponder arrangement indicate that the authorized person is present.

With respect to the vehicle-based transponder assembly 342, the assembly includes a plurality of magnetic antennas 348 A and 348 B. Each magnetic antenna (e.g. 348A ) is located at a predefined location of the vehicle and sends magnetic signals (e.g. 350A ) that penetrate a certain assigned vehicle area. Preferably, each magnetic antenna 348 A and 348 B is a short cylindrical coil that is electrically actuated by controller 328 to provide a field pattern. In one example, the field pattern is a torus field pattern.

In the example shown in FIG. 7, two magnetic antennas 348 A and 348 B are provided in the vehicle 312 . A first magnetic antenna ne 348 A is located in an outside mirror 352 and provides magnetic (LF) signals 350 A that penetrate a vehicle area that is adjacent to the mirror. A second magnetic antenna 348 B is located in the door 318 near the door handle 320 and provides magnetic (LF) signals 350 B that penetrate a vehicle area that is near the door handle. The first and second magnetic antennas 348 A and 348 B are operatively connected to the controller 328 354A and 354B . The magnetic antennas 348 A and 348 B are accordingly excited to send their corresponding LF signals 350 A and 350 B in response to electrical excitation signals provided by the controller 328 .

The LF signals 350 A and 350 B, which are emitted by the magnetic antennas 348 A and 348 B, are to be received by the ID transponder 344 . In response to LF signals 350 A and 350 B, the ID transponder 344 sends signals 358 , which are received at an antenna 356 of the vehicle-based transponder arrangement 342 . Antenna 356 is operatively connected 360 to controller 328 . In the preferred embodiment, the signals from the ID transponder 344 to the vehicle-based transponder arrangement 342 are RF signals and the antenna 356 is an RF antenna.

Each magnetic antenna 348 A and 348 B is able to send an LF query signal. In response to receipt of an LF query signal, the ID transponder 344 emits an RF access request signal as a request to unlock the door 318 . The access request signal provides a suitable security code which identifies the ID transponder 344 and thus identifies the carrier of the ID transponder as a person who is authorized to enter the vehicle 312 .

Verifi response to receiving the RF access request signal, the controller 328 342 decorates the vehicle-based transponder arrangement, the security code information provided. When the identification is identified, controller 329 causes the lock to be operated in the unlocked state. Generally speaking, the vehicle-based transponder assembly 342 and the ID transponder 344 are in a communication arrangement to perform the query and automatic unlock sequence for the authorized person.

According to the present invention, the vehicle-based transponder assembly 342 causes the magnetic antennas 348 A and 348 B to send LF request signals that cause the ID transponder 344 to provide a request response that is only for the presence of the ID transponder in the associated vehicle area displays. For example, the request signal is a short continuous pulse and the request response signal from the ID transponder 344 is a short RF pulse. As an alternative to a continuous pulse, each request signal provides data.

In one embodiment, the magnetic antennas 348 A and 348 B are alternately excited by the controller 328 to alternately deliver the request signals. As shown in the example of FIG. 7, only the request signal provided by the second magnetic antenna 348 B is currently being transmitted, and the other request signal (shown in broken lines) is transmitted at a different time. When the ID transponder 344 responds to a request signal, the controller 329 identifies the magnetic antenna (e.g. 348B ) that transmitted the request signal that caused the request response.

The identified magnetic antenna (e.g. 348B ) is used to transmit a full interrogation signal. Since the response to the request signal indicates that the ID transponder 344 is receiving signals from the identified magnetic antenna, the request signal is received by the ID transponder. The ID transponder 344 in turn provides the security code identification through the access request signal. Upon verification of the identification provided by the access request signal, controller 328 unlocks door 318 , as described above.

Fig. 8 illustrates that it is possible that two identification transponder may be located 444 and 444 'in a vehicle area that a plurality of magnetic antennas (for. Example, 448A) is associated. Such an event is possible if two authorized persons arrange their ID transponders 444 and 444 'in the area. It is contemplated that system 410 is not prevented from detecting the presence of an ID transponder. An example of a solution is to have the multiple ID transponders 444 and 444 'respond to an LF request signal simultaneously and then deliver an LF request signal that only addresses one of the ID transponders (e.g. 444 ). Other known signal collision avoidance techniques can be used.

From the above description of the invention, those skilled in the art will perceive improvements conditions, changes and modifications. For example, you can the magnetic antennas are located anywhere and a be have any number. In addition, the invention can be applied to other than that Vehicle functions described here can be used. Such verb Changes, changes and modifications within the specialist skill should be covered by the appended claims.

Claims (34)

1. A system for remote control of a vehicle function, the system comprising:
a plurality of interrogation means, each operable to emit an interrogation signal through a vehicle area associated with an appropriate interrogation means;
portable identification means for receiving the interrogation signals and for sending a response signal which provides identification in response to receipt of one of the interrogation signals;
Means for receiving the response signal and for performing the vehicle function in response to receiving the response signal; and
Means for determining in which vehicle area the portable identification means are located and for actuating the associated interrogation means in order to transmit the one interrogation signal. 2. A system according to claim 1, wherein the vehicle function is the actuation is a vehicle engine ignition release component, the Means for receiving the response signal and performing the Vehicle function Means for actuating the engine ignition release compo include elements to allow engine ignition. 3. A system according to claim 1, wherein the vehicle function is the actuation is a vehicle entrance access control component, wherein the means for receiving the response signal and performing the Vehicle function Means for actuating the access control component include to allow access to the vehicle. 4. A system according to claim 1, wherein the vehicle areas include a loading richly extending in an interior of the vehicle, wherein one of the query means means for sending the assigned  Interrogation signal through which extend in the interior of the vehicle covers the area. 5. A system according to claim 1, wherein the vehicle areas include a loading include rich that extends outside the vehicle, ei nes of the query means means for sending out the assigned query gesignals by the Be extending outside the vehicle richly embraced. A system according to claim 1, wherein the means for determining one Comprising a plurality of inquiry means, each operable to to send out a request signal through the vehicle area that one corresponding one of the query means and a corresponding one of the Ab is assigned question means, the portable identification means Include means for receiving the request signals and for outside that of a request response signal in response to receipt of a Request signal, the means for determining also comprising means, to determine which request means caused the means for sending out a request answer signal, the request answer signal have sent out. 7. A system according to claim 6, the means for controlling the plurality of Request means comprises to send request signals sequentially. 8. A system according to claim 6, the means for controlling the plurality of Inquiry means comprises to simultaneously transmit groups of inquiry signals send out. A system according to claim 6, wherein the plurality of requesting means Means for sending the request signals as continuous signals.   A system according to claim 6, wherein the plurality of requesting means Means for sending out the request signals to convert data believe it. 11. A system according to claim 1, wherein the plurality of query means Means for sending the interrogation signals as magnetic low frequency includes sequence signals. 12. A system according to claim 1, wherein the portable identification means Means for sending out the response signal as a radio frequency signal include. 13. A system for remotely controlling a vehicle function, the system comprising:
a plurality of interrogation means, each functioning to emit an interrogation signal through a vehicle area associated with a corresponding one of the interrogation means;
portable identification means for receiving one of the interrogation signals and for transmitting a response signal which provides an identification in response to receipt of the one interrogation signal;
Means for receiving the response signal and for performing the vehicle function in response to receiving the response signal; and
Means to determine before sending one of the query signals which of the query means is to be actuated to send out his query signal so that the transmitted query signal is received on the portable identification means. 14. A system according to claim 13, wherein the vehicle function is actuation is a vehicle engine ignition release component, the Mit tel to receive the response signal and to carry out the driving Tool function means for actuating the vehicle engine ignition-free include component to allow engine ignition.   15. A system according to claim 13, wherein the vehicle function is actuation against a vehicle entrance access control component, the Means for receiving the response signal and performing the driving tool function means for actuating the access control component include to allow access to the vehicle. 16. A system according to claim 13, wherein the vehicle areas include a loading richly extending in the interior of the vehicle, wherein one of the query means means for sending the assigned Interrogation signal by the he in the interior of the vehicle stretching area includes. 17. A system according to claim 13, wherein the vehicle areas include a loading include rich extending outside the vehicle, ei nes of the query means means for sending out the assigned query gesignals by the Be extending outside the vehicle richly embraced. A system according to claim 13, wherein the means for determining one Comprising a plurality of inquiry means, each operable to to send out a request signal through the vehicle area that one corresponding to the query means and a corresponding to the request is assigned question means, the portable identification means Include means for receiving the request signals and for outside that of a request response signal in response to receipt of a Request signal, the means for determining also comprising means, to determine which request means caused the means for sending out a request answer signal, the request answer signal have sent out.   19. A system according to claim 18, the means for controlling the plurality of requesting means for sequentially reading out request signals the. 20. A system according to claim 18, the means for controlling the plurality of requesting means to simultaneously handle groups of requesti to send out signals. 21. A system according to claim 13, wherein the plurality of query means Means for sending the interrogation signals as magnetic low frequency includes sequence signals. A system according to claim 13, wherein the portable identification is tel means for transmitting the response signal as a high-frequency signal include. 23. A system for remotely controlling a vehicle function, the system comprising:
a plurality of interrogation means, each operable to emit an interrogation signal, each interrogation signal being capable of being received in a vehicle region associated with a corresponding one of the interrogation signals;
portable identification means for receiving one of the interrogation signals when the identification means are located in the corresponding assigned area and the corresponding interrogation means emitting the one interrogation signal and for sending out a response signal which provides an identification in response to the reception of one of the interrogation signals;
Means for receiving the response signal and for performing the vehicle function in response to receiving the response signal; and
Means for determining which of the plurality of interrogation means is to be actuated in order to deliver the one interrogation signal for reception by the identification means and for actuating the one interrogation means in order to emit the one interrogation signal. 24. A system according to claim 23, wherein the vehicle function is actuation is a vehicle engine ignition release component, the Mit tel to receive the response signal and to carry out the driving Tool function means for actuating the vehicle engine ignition-free include component to allow engine ignition. 25. A system according to claim 23, wherein the vehicle function is actuation against a vehicle entrance access control component, the Means for receiving the response signal and performing the Vehicle function Means for actuating the access control component include to allow access to the vehicle. 26. A system according to claim 23, wherein the vehicle areas include a loading richly extending in the interior of the vehicle, wherein one of the query means means for sending the assigned Interrogation signal by the he in the interior of the vehicle stretching area includes. 27. A system according to claim 23, wherein the vehicle areas include a loading include rich extending outside the vehicle, ei nes of the query means means for sending out the assigned query gesignals by the Be extending outside the vehicle richly embraced. A system according to claim 23, wherein the means for determining one Comprising a plurality of inquiry means, each operable to to send out a request signal through the vehicle area that one corresponding to the request means and a corresponding to the request is assigned question means, the portable identification means Include means for receiving the request signals and for outside  that of a request response signal in response to receipt of a Request signal, the means for determining also comprising means, to determine which request means caused the means for sending out a request answer signal, the request answer signal have sent out. 29. A system for remotely controlling a vehicle function, the system comprising:
a plurality of antennas, each operable to transmit an inquiry signal and an inquiry signal through an associated area on the vehicle;
a transponder for receiving the request signals and for sending out a first response signal which provides a presence indicator in response to the reception of one of the request signals, and for receiving the query signals and for transmitting a second response signal which is in response to the reception of one of the request signals Identification supplies; and
a controller to cause the request signals to be transmitted in a sequence to determine which antenna is associated with the event that the transponder transmits the first response signal to cause the particular antenna to transmit its request signal, and to execute the vehicle function accordingly, that the transponder sends out the second response signal upon receipt of the transmitted interrogation signal. 30. A system according to claim 29, wherein the vehicle function is actuation against a vehicle engine ignition release component. 31. A system according to claim 29, wherein the vehicle function is actuation against a vehicle entrance access control component. 32. A transponder for a system that remotely controls a vehicle function, the transponder comprising:
Means for receiving any of a plurality of request signals that can be transmitted by corresponding vehicle areas;
Means for emitting a first response signal which provides a presence indicator for a corresponding area in response to receipt of one of the request signals;
Means for receiving any of a plurality of interrogation signals that can be transmitted through the corresponding areas of a vehicle interior; and
Means for sending a second response signal, which supplies an identification in response to the receipt of the query signal associated with the corresponding area. 33. A method for remotely controlling a vehicle function, the method comprising:
Providing a plurality of interrogation means, each operable to transmit a signal through a vehicle area associated with a corresponding one of the interrogation means;
Determining in which vehicle area portable identification means are located;
Operating the associated polling means to send out a polling signal;
Receiving the interrogation signal on the portable identification means;
Sending out a response signal from the portable identification means, which provides an identification in response to receipt of the query signal;
Means for receiving the response signal; and
Executing the vehicle function in response to receiving the response signal. 34. A method for remotely controlling a vehicle function, the method comprising:
Sending a plurality of request signals in a sequence through assigned areas on the vehicle;
Receiving a request signal at a transponder located in one of the assigned areas;
Sending a first response signal from the transponder, which provides a presence indicator in response to the receipt of the one request signal;
Determining in which area the transponder is located using the first response signal;
Sending an interrogation signal that is assigned to an area in which the transponder is located;
Receiving the interrogation signal at the transponder;
Sending out a second response signal from the transponder, which supplies an identification in response to the reception of the one interrogation signal; and
Executing the vehicle function in response to the trans ponder sending out the second response signal.