US20190168712A1 - System and methods for vehicle passive keyless entry triggered by smartphone proximity detection - Google Patents
System and methods for vehicle passive keyless entry triggered by smartphone proximity detection Download PDFInfo
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- US20190168712A1 US20190168712A1 US15/830,504 US201715830504A US2019168712A1 US 20190168712 A1 US20190168712 A1 US 20190168712A1 US 201715830504 A US201715830504 A US 201715830504A US 2019168712 A1 US2019168712 A1 US 2019168712A1
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- Prior art keywords
- vehicle
- smartphone
- key fob
- distance
- signal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/20—Means to switch the anti-theft system on or off
- B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
- B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2325/00—Indexing scheme relating to vehicle anti-theft devices
- B60R2325/10—Communication protocols, communication systems of vehicle anti-theft devices
- B60R2325/101—Bluetooth
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R2325/00—Indexing scheme relating to vehicle anti-theft devices
- B60R2325/20—Communication devices for vehicle anti-theft devices
- B60R2325/205—Mobile phones
Definitions
- the current disclosure relates to a system and method for unlocking doors for a vehicle.
- the current disclosure relates to a system and method for using a key fob and a smartphone to unlock doors or a trunk for a vehicle.
- a key fob system to lock or unlock vehicle doors is convenient for a driver because the driver does not have to use an actual key to lock or unlock the vehicle doors.
- the key fob system allows the driver to lock or unlock a rear hatch or truck and to remotely initiate a vehicle engine.
- the key fob system can be used to alert the driver to locate his vehicle by alarming sound or turning lights on and off.
- recent trends have been to add greater range, to give them bi-directional capacity, and to add a display to indicate vehicle information. Since these control functions requires more energy and power, the current trend is to make the key fob battery rechargeable or larger, heavier and more expensive.
- the system and method disclosed herein was developed to reduce consumption of battery power so that the key fob system can be kept as small as possible without requiring frequent recharging, while still maintaining the same function as required by today's car industry.
- the current disclosure relates to unlocking or unlatching at least one vehicle door or a trunk and operating other welcome features on the vehicle, including but not limited to, opening a tailgate, turning on ambient lights or head lights, and starting the vehicle engine.
- the current disclosure is directed to a system and method for automatically unlocking at least one door or a trunk on the vehicle using a smartphone and vehicle key fob. Due to the method provide herein, the vehicle key fob is not required to be recharged frequently, or a size of the key fob does not have to be large enough to hold large batteries. In most situations, the key fob stays at low energy mode so that the key fob does not require large batteries or frequent recharging.
- an embodiment of the present disclosure may provide a method comprising steps of: initiating wireless communication between a smartphone and a vehicle when the smartphone is within a first vehicle range; in response to initiating the wireless communication, transmitting a wake-up signal from the vehicle to a key fob to wake up the key fob when the key fob is within a second vehicle range; initiating an exchange with the key fob to measure a distance between the key fob and the vehicle in response to waking up the key fob; and operating a remote feature on the vehicle when the key fob is found within at least one predefined authorization zone or a pattern of sequential geometric locations describe the key fob approaching the vehicle.
- an embodiment of the present disclosure may provide a method comprising steps of: establishing a wireless connection between a smartphone and a vehicle when a first distance between the smartphone and the vehicle is within a first pre-determined distance value; sending a wake-up signal to a key fob in wireless communication with the vehicle when a second distance between the smartphone and the vehicle is within a second pre-determined distance value; and activating a vehicle function within the vehicle when the key fob is found within at least one predefined authorization zone or a pattern of sequential geometric locations describe the key fob approaching the vehicle.
- an embodiment of the present disclosure may provide a method for unlocking at least one door or a trunk or operating other welcome features on a vehicle, comprising steps of: initiating a wireless connection between a smartphone and the vehicle when the smartphone is within a communication range from the vehicle, wherein the wireless connection is used to track a distance between the smartphone and the vehicle; transmitting a wake-up signal from the vehicle to the key fob when the smartphone is within a second communication range from the vehicle, the second communication range being less than the first communication range; receiving ultra-wideband (UWB) signals from the key fob to determine a position of the key fob when the key fob is within the second communication range; and activating a remote feature on the vehicle when the key fob is within an authorization zone of the vehicle.
- UWB ultra-wideband
- FIG. 1 is in accordance with the present disclosure showing a system for unlocking at least one door or a trunk or operating welcome features on a vehicle;
- FIG. 2 is an exemplary schematic view of the vehicle door unlocking system showing that a smartphone and a vehicle key fob is located outside of a first vehicle communication range;
- FIG. 3 is an exemplary schematic view of the vehicle door unlocking system showing that the smartphone and key fob is located inside of the first vehicle communication range but outside of a second vehicle communication range;
- FIG. 4 is an exemplary schematic view of the vehicle door unlocking system showing that both the smartphone and the key fob are located inside of the second vehicle communication range;
- FIG. 5 is a first block diagram to implement a proposed method for unlocking a vehicle door and operating other welcome features on the vehicle;
- FIG. 6 is a second block diagram to implement a proposed method for unlocking a vehicle door and operating other welcome features on the vehicle.
- FIG. 7 is a third block diagram to implement a proposed method for unlocking a vehicle door and operating other welcome features on the vehicle.
- the current disclosure relates to a vehicle passive keyless entry system that is triggered by a smartphone proximity detection to remotely operate a vehicle locking and unlocking system or wake up other features on the vehicle.
- the distance between a vehicle and a user carrying both a smartphone and a key fob may be measured.
- the distance between the smartphone and the vehicle may be measure based on signal strength, time-of-flight (ToF), or acceleration sensors when the user approaches the vehicle and the smartphone becomes within the range of Wi-Fi or Bluetooth communication.
- a wakeup signal may be sent to the key fob to activate distance tracking between the key fob and the vehicle when the person walks closer to the vehicle.
- LF low frequency
- UWB ultra-wide band
- a passive vehicle entry system 10 may comprise a vehicle communication system 12 , a vehicle key fob 14 and a smartphone 16 .
- the vehicle communication system 12 may include a tele-communication device which has capability of transmitting and/or receiving signals through Wi-Fi, Bluetooth, 2G, 3G, or LTE etc.
- the communication system 12 may be located inside of a vehicle 18 .
- the communication system 12 may include at least one receiver 19 , at least one transmitter 20 , and at least one controller 22 .
- the receiver 19 and the transmitter 20 can be replaced by a transceiver (not shown) which can receive and transmit signals.
- the vehicle communication system 12 may be connected to an unlocking device 24 of the vehicle 18 to open at least one vehicle door.
- the communication system 12 can be further connected to a remote start device 26 to start an engine or and an alarming device 28 to make alerting sound.
- a remote start device 26 to start an engine or and an alarming device 28 to make alerting sound.
- the communication system 12 can be located outside of the vehicle 18 and can be controlled by a remote controller (not shown in FIG. 1 ).
- the smartphone 16 may include a communication device 30 and a proximity sensor 32 .
- the communication device 30 may allow the smartphone 16 to be wirelessly connected to the vehicle 18 using any communication method, including but not limited to Wi-Fi, Bluetooth, 2G, 3G, or LTE so that the vehicle 18 is in electrical communication with the smartphone 16 once the smartphone 16 is located within a vehicle communication range.
- a typical vehicle communication range using Wi-Fi or Bluetooth between the vehicle 18 and the smartphone 16 may be from about 10 to about 30 meters. However, in another embodiment, the vehicle communication range may be less than about 10 meters or more than about 30 meters.
- the vehicle key fob 14 may include a communication device 34 , which allows connection with the vehicle 18 to transmit and/or receive signals back and forth.
- the smartphone 16 may not be in direct communication with the vehicle key fob 14 .
- the smartphone 16 can be in direct communication with the vehicle key fob 14 so that the smartphone 16 and the key fob 14 can transmit and/or receive signals back and forth.
- a process of unlocking a least one vehicle door or a trunk using the passive vehicle entry system 10 is illustrated.
- a user (not shown in FIG. 2 ) holding the smartphone 16 and the vehicle key fob 14 may be located outside of a first vehicle communication range 36 and a second vehicle communication range 38 .
- the first vehicle communication range 36 may be defined where the smartphone 16 is in wireless communication with the vehicle 18 to transmit and/or receive signals or information back and forth.
- the second vehicle communication range 38 may be defined where the vehicle key fob 14 is in wireless communication with the vehicle 18 to transmit and/or receive signals or information back and forth.
- the first vehicle communication range 36 may be greater than the second vehicle communication range 38 .
- the proximity sensor 32 on the smartphone 16 may detect the distance between the smartphone 16 and the vehicle 18 . If the distance between the smartphone 16 and the vehicle 18 is within the first vehicle communication range 36 , then the vehicle 18 and the smartphone 16 may initiate communication to share the distance information between the vehicle 18 and the smartphone 16 .
- the distance information between the vehicle 18 and the smartphone 16 may be carried by either Wi-Fi or Bluetooth connection. In another embodiment, the distance information can be carried by any other existing tele-communication means.
- the smartphone 16 may start processing Time-of-Flight (ToF) of radio wave measurement, triangulation, trilateration, and/or Received Signal Strength Indicator (RSSI) to determine distance between the smartphone 16 and the vehicle 18 .
- the vehicle 18 may start processing Time-of-Flight of radio wave measurement, triangulation, trilateration, and/or Received Signal Strength Indicator to determine distance between the smartphone 16 and the vehicle 18 .
- Time-of-Flight is a property of an object, particle or acoustic, electromagnetic or another wave. It refers to the time that such an object needs to travel a distance through a medium. Tracking ToF of a known signal between two sources, therefore, can be used to determine the distance between those sources. According to one or more embodiments of the present disclosure, distance tracking between the smartphone 16 (or key fob 14 ) and the vehicle 18 may be accomplished by applying ToF to ultra-wideband (UWB) signals, Wi-Fi signals, global positioning system (GPS) signals, or the like.
- UWB ultra-wideband
- Wi-Fi Wireless Fidelity
- GPS global positioning system
- the triangulation or trilateration technique using Wi-Fi or UWB signals may be employed to track the position of the smartphone 16 (or key fob 14 ) against the vehicle 18 , according to one or more embodiments of the present disclosure.
- RSSI is a measurement of the power present in a received radio signal.
- RSSI localization techniques are based on measuring signal strength from a client device to several different access points, and then combining this information with a propagation model to determine the distance between the client device and the access points.
- RSSI may be employed either alone or in combination with other distance tracking techniques to determine the location of the smartphone 16 (or key fob 14 ) in relation to the vehicle 18
- a vehicle key fob wakeup process may be initiated by the vehicle communication system 12 utilizing either Low Frequency (LF), Ultra High Frequency (UHF), or Super High Frequency (SHF) communication so that the vehicle key fob 14 is electrically ready to transmit signals to the vehicle 18 or receive signals from the vehicle 18 .
- LF Low Frequency
- UHF Ultra High Frequency
- SHF Super High Frequency
- the vehicle key fob wakeup process can be initiated as the distance between the vehicle 18 and the smartphone 16 is less than 2 meters or greater than 3 meters.
- This process may be determined by predicted possibility of wakeup (i.e. wakeup signal believed to be reaching the key fob) and predicted possibility that the vehicle key fob 14 will be able to call the vehicle 18 reliably and continuously.
- the LF, UHF or SHF communication of the vehicle key fob wakeup process is typical for passive entry systems that can “wake up” the vehicle key fob 14 from ultra-low power mode, where the vehicle side may introduce the pulses with high enough power to be able to produce high enough level of power to energize otherwise depowered circuits of the vehicle key fob 14 .
- the key fob 14 will continue communication to the vehicle 18 for distance measurement using either LF communication, UWB communication, or both.
- LF distance measurement communication uses RSSI, while UWB distance measurement communication relies on ToF.
- LF uses more energy to transmit than to receive. Therefore, the vehicle 18 may initiate LF distance measurement communication between the vehicle and the key fob 14 .
- UWB communication uses less energy than LF communication. Accordingly, the key fob 14 may initiate UWB distance measurement communication with the vehicle 18 .
- Distance measurement requires an exchange of signals between the key fob and the vehicle.
- the distance between the antennas of the vehicle key fob 14 and the antennas of the vehicle 18 can be determined reliably with the accuracy of up to 2.5 centimeters, helping determine whether the key fob 14 is located within the boundary of a predefined authorization zone 40 .
- FIGS. 5-7 show various flow charts depicting methods in accordance with various embodiments of the present disclosure.
- a first method 100 to implement the proposed communication with a vehicle using a vehicle key fob and a smartphone is provided.
- wireless communication may be initiated between the smartphone 16 and the vehicle 18 when the smartphone is located within a first vehicle range.
- the first vehicle range may be defined as a distance between the smartphone 16 and the vehicle 18 where the smartphone 16 and the vehicle 18 can wirelessly communicate using Wi-Fi, Bluetooth, or the like.
- Initiating wireless communication with the smartphone 16 may involve the vehicle determining whether the smartphone 16 is located within the first vehicle range.
- the smartphone 16 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) that can be picked up by the receiver 19 indicating the smartphone 16 is within the first vehicle range.
- the vehicle 18 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) via the transmitter 20 that can be picked up by the smartphone 16 when the smartphone 16 is within the first vehicle range.
- the receiver 19 may then receive a confirmation signal from the smartphone 16 confirming to the vehicle 18 that the smartphone 16 is within the first vehicle range.
- the first vehicle range me be about 10-30 meters.
- Initiating wireless communication between the smartphone 16 and the vehicle 18 may trigger the vehicle 18 to begin transmitting a wake-up signal for the key fob 14 , as provided at step 104 .
- the vehicle 18 may transmit a wake-up signal to the vehicle key fob 14 to wake up the key fob 14 when it is within a second vehicle range.
- the second vehicle range may be defined as a distance between the key fob 14 and the vehicle 18 where the key fob can successfully receive the wake-up signal and transition from a low energy mode to a normal energy mode to be ready to communicate with the vehicle 18 .
- the second vehicle range may be about 2-3 meters.
- the wake-up signal may be a low-frequency signal.
- the transmitter 20 may transmit a low-frequency signal capable of activating the key fob 14 when it is within the second vehicle range.
- the wake-up signal to the key fob 14 from the vehicle 18 may be a UHF or SHF signal.
- Waking up the key fob 14 may activate a UWB circuit or transmitter (not shown) in the key fob 14 for exchanging UWB signals with the vehicle 18 to track the distance therebetween and locate the key fob with respect to the vehicle. Accordingly, at a step 106 , a UWB exchange may be initiated between the key fob 14 and the vehicle 18 to measure a distance between the key fob and the vehicle in response to waking up the key fob.
- the UWB exchange may at least include receiving at the vehicle 18 a first UWB signal from the key fob 14 to initiate distance tracking, transmitting from the vehicle 18 a second UWB signal to the key fob 14 , and receiving at the vehicle 18 a third UWB signal from the key fob 14 in response to the second UWB signal.
- the vehicle 18 may determine the distance between the key fob 14 and the vehicle 18 by applying time-of-flight (ToF) measurement of the UWB signals being exchanged, as provided at step 108 .
- ToF time-of-flight
- distance or location tracking of the key fob 14 with respect to the vehicle may be accomplished using Wi-Fi or UWB triangulation or trilateration.
- a remote feature on the vehicle may be operated.
- the vehicle 18 may automatically unlock at least one door or a trunk if it detects the key fob 14 within an authorization zone.
- a predefined authorization zone may be a predetermined three-dimensional geometric space or zone.
- Other remote features on the vehicle 18 that may be operated include opening a tail gate, opening a door, turning on ambient lights or head lights, or starting an engine.
- a particular remote feature may be operated when the key fob 14 is within a particular predefined authorization zone.
- a predefined authorization zone may be assigned to the front left door of the vehicle.
- a predefined authorization zone may be located from 0 to 1.5 meters from an external surface of the vehicle. In another embodiment, a predefined authorization zone can include space greater than 1.5 meters from the vehicle's external surface.
- the vehicle 18 may operate a remote feature when a pattern of sequential geometric locations describes the key fob 14 approaching the vehicle. For instance, the vehicle may open a door when the vehicle detects a key fob 14 approaching the vehicle from behind based on the pattern of sequential geometric locations. However, the vehicle may be reluctant to open a door when it detects the key fob 14 is approaching the vehicle from the front in order to prevent a user from striking the door or being hit by the door itself.
- a second method 200 to implement the proposed communication with a vehicle using a vehicle key fob and a smartphone is provided.
- the key fob 14 and the smartphone 16 may be remotely located from the vehicle 18 .
- all doors or a trunk of the vehicle 18 may already be locked, and other features on the vehicle 18 such as welcoming features (i.e., ambient lights or head lights etc.) may already be turned off.
- a wireless connection between the smartphone 16 and the vehicle 18 may be established.
- the wireless connection may be established when a first distance between the smartphone and the vehicle is within a first pre-determined distance value.
- the first pre-determined distance value may be defined as a distance between the smartphone 16 and the vehicle 18 where the smartphone 16 and the vehicle 18 can wirelessly communicate using Wi-Fi, Bluetooth, or the like. Establishing a wireless connection with the smartphone 16 may involve the vehicle determining whether the smartphone 16 is located within the first pre-determined distance value.
- the smartphone 16 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) that can be picked up by the receiver 19 indicating the smartphone 16 is within the first pre-determined distance value.
- the vehicle 18 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) via the transmitter 20 that can be picked up by the smartphone 16 when the smartphone 16 is within the first pre-determined distance value.
- the receiver 19 may then receive a confirmation signal from the smartphone 16 confirming to the vehicle 18 that the smartphone 16 is within the first pre-determined distance value.
- the first distance between the vehicle 18 and the smartphone 16 may be measured.
- a user/driver holding the smartphone 16 and the vehicle key fob 14 may approach the vehicle 18 .
- the proximity sensor 32 on the smartphone 16 may detect proximity to the vehicle 18 and establish the wireless connection to the vehicle when the first distance is within the pre-determined distance value.
- the first pre-determined distance value may be from about 10 to about 30 meters. However, in another embodiment, the first pre-determined distance can be less than 10 meters and greater than 30 meters.
- the vehicle 18 and the smartphone 16 may initiate electrical tele-communication (i.e., wireless connection) between them.
- the vehicle 18 may communicate with the smartphone via its receiver 19 and transmitter 20 (which may be combined to form a transceiver).
- the tele-communication may be established using Bluetooth or Wi-Fi connection.
- the tele-connection between the vehicle 18 and the smartphone 16 can be established using any other tele-communication methods.
- a second distance between the vehicle 18 and the smartphone 16 may be measured to determine whether the second distance between the vehicle 18 and the smartphone 16 is within a second pre-determined distance value.
- the second pre-determined distance value may be about 3 meters. In another embodiment, the second pre-determined distance value can be less or greater than 3 meters.
- measuring the second distance between the smartphone 16 and the vehicle 18 may be accomplished by applying ToF using GPS, Wi-Fi or UWB and/or Received Signal Strengthen Indicator (RSSI) between the smartphone 16 and the vehicle 18 .
- RSSI Received Signal Strengthen Indicator
- measuring the second distance between the smartphone 16 and the vehicle 18 may be accomplished by applying Wi-Fi or UWB triangulation or trilateration.
- the vehicle 18 may transmit a wake-up signal to the vehicle key fob 14 held by the driver/user to activate the vehicle key fob 14 to be ready for communication with the vehicle 18 .
- Activating the key fob 14 may be accomplished by triggering a wakeup request (e.g., either LF, UHF, or SHF). Waking up the key fob 14 may activate, for example, an ultra-wideband (UWB) circuit or transmitter (not shown) in the key fob 14 for exchanging UWB signals with the vehicle 18 to track the distance therebetween and locate the key fob with respect to the vehicle.
- UWB ultra-wideband
- a location of the key fob 14 with respect to an authorization zone may be measured or otherwise detected.
- the location of the key fob 14 around the vehicle 18 may be measured by applying ToF using GPS, Wi-Fi, UWB, or the like.
- a UWB exchange may be initiated between the key fob 14 and the vehicle 18 to determine an orientation or location of the key fob against the vehicle using ToF of the radio signal between the key fob and one or more vehicle antennas.
- the vehicle 18 may activate a function within the vehicle (e.g., unlock at least one door for the vehicle 18 , unlatch a trunk of the vehicle 18 , or the like), as provided at a step 210 .
- the authorization zone may be approximately defined as a 1.5-meter radius around a particular vehicle door or tailgate.
- the authorization zone may have a three-dimensional spherical or cubic shaped attached to a left, right, and/or rear side of the vehicle 18 .
- the vehicle function invoked may include other welcome features such as opening a tailgate, turning on ambient lights or head lights, or starting an engine for the vehicle 18 .
- a third method 300 to implement the proposed communication with a vehicle using a vehicle key fob and a smartphone is provided.
- the smartphone 16 and the vehicle key fob 14 may be initially located out of a first communication range from the vehicle 18 .
- a driver/user who holds the smartphone 16 and the vehicle key fob 14 may bring the smartphone 16 and the vehicle key fob 14 within the first communication range with the vehicle 18 .
- a wireless connection between the smartphone 16 and the vehicle 18 may be initiated.
- the wireless connection may be initiated when the smartphone 16 is within the first communication range of the vehicle 18 .
- the first communication range may be defined as a distance between the smartphone 16 and the vehicle 18 where the smartphone 16 and the vehicle 18 can wirelessly communicate using Wi-Fi, Bluetooth, or the like. Initiating a wireless connection with the smartphone 16 may involve the vehicle 18 determining whether the smartphone 16 is located within the first communication range.
- the smartphone 16 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) that can be picked up by the receiver 19 indicating the smartphone 16 is within the first communication range.
- the vehicle 18 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) via the transmitter 20 that can be picked up by the smartphone 16 when the smartphone 16 is within the first communication range.
- the receiver 19 may then receive a confirmation signal from the smartphone 16 confirming to the vehicle 18 that the smartphone 16 is within the first communication range.
- the first communication range between the smartphone 16 and the vehicle 18 may be less than about 30 meters.
- the first communication range can be less than less than about 20 meters.
- the first communication range can be less than about 10 meters.
- Distance tracking may be employed by virtue of the wireless connection between the smartphone 16 and the vehicle 18 to track the distance between the smartphone and the vehicle. Accordingly, at a step 304 , the vehicle 18 may exchange distance tracking signals with the smartphone 16 . The distance tracking may be accomplished by ToF (using GPS, Wi-Fi, UWB, or the like), trilateration or triangulation (using UWB or Wi-Fi). As a driver/user holding the smartphone 16 and the vehicle key fob 14 continues to approach the vehicle 18 , the driver/user may bring the smartphone 16 and the vehicle key fob 14 within a second communication range of the vehicle 18 . The second communication range may be less than the first communication range. In one embodiment, the second communication range may be about 3 meters.
- the second communication range can be less than or greater than 3 meters.
- the vehicle may transmit a wake-up signal to the key fob 14 to wake up the key fob from a sleep state to an active state.
- the wake-up signal to the key fob may be accomplished by wirelessly transmitting a short-range (low frequency) signal from the vehicle 18 .
- the key fob 14 may begin transmitting UWB signals to the vehicle 18
- the vehicle 18 may receive the UWB signals from the key fob 14 once it is determined that the smartphone 16 is located within the second communication range of the vehicle 18 . Accordingly, a UWB exchange may be initiated between the key fob 14 and the vehicle 18 to track the distance between the key fob and the vehicle.
- the vehicle 18 may activate a remote vehicle function when the key fob 14 is within an authorization zone of the vehicle 18 .
- the authorization zone may be approximately defined as a 1.5-meter radius around a particular vehicle door or tailgate.
- the authorization zone may have a three-dimensional spherical or cubic shaped attached to a left, right, and/or rear side of the vehicle 18 . In another embodiment, the authorization zone may be less than or greater than 1.5 meters.
- the remote vehicle function may include unlocking at least one door or trunk on the vehicle 18 , opening a tailgate, turning on at least one light, or starting an engine.
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Abstract
Description
- Generally, the current disclosure relates to a system and method for unlocking doors for a vehicle. Particularly, the current disclosure relates to a system and method for using a key fob and a smartphone to unlock doors or a trunk for a vehicle.
- Using a key fob system to lock or unlock vehicle doors is convenient for a driver because the driver does not have to use an actual key to lock or unlock the vehicle doors. Also, the key fob system allows the driver to lock or unlock a rear hatch or truck and to remotely initiate a vehicle engine. Furthermore, the key fob system can be used to alert the driver to locate his vehicle by alarming sound or turning lights on and off. To broaden the range of applications of such a key fob system, recent trends have been to add greater range, to give them bi-directional capacity, and to add a display to indicate vehicle information. Since these control functions requires more energy and power, the current trend is to make the key fob battery rechargeable or larger, heavier and more expensive.
- The system and method disclosed herein was developed to reduce consumption of battery power so that the key fob system can be kept as small as possible without requiring frequent recharging, while still maintaining the same function as required by today's car industry.
- The current disclosure relates to unlocking or unlatching at least one vehicle door or a trunk and operating other welcome features on the vehicle, including but not limited to, opening a tailgate, turning on ambient lights or head lights, and starting the vehicle engine. The current disclosure is directed to a system and method for automatically unlocking at least one door or a trunk on the vehicle using a smartphone and vehicle key fob. Due to the method provide herein, the vehicle key fob is not required to be recharged frequently, or a size of the key fob does not have to be large enough to hold large batteries. In most situations, the key fob stays at low energy mode so that the key fob does not require large batteries or frequent recharging.
- In one aspect, an embodiment of the present disclosure may provide a method comprising steps of: initiating wireless communication between a smartphone and a vehicle when the smartphone is within a first vehicle range; in response to initiating the wireless communication, transmitting a wake-up signal from the vehicle to a key fob to wake up the key fob when the key fob is within a second vehicle range; initiating an exchange with the key fob to measure a distance between the key fob and the vehicle in response to waking up the key fob; and operating a remote feature on the vehicle when the key fob is found within at least one predefined authorization zone or a pattern of sequential geometric locations describe the key fob approaching the vehicle.
- In another aspect, an embodiment of the present disclosure may provide a method comprising steps of: establishing a wireless connection between a smartphone and a vehicle when a first distance between the smartphone and the vehicle is within a first pre-determined distance value; sending a wake-up signal to a key fob in wireless communication with the vehicle when a second distance between the smartphone and the vehicle is within a second pre-determined distance value; and activating a vehicle function within the vehicle when the key fob is found within at least one predefined authorization zone or a pattern of sequential geometric locations describe the key fob approaching the vehicle.
- In another aspect, an embodiment of the present disclosure may provide a method for unlocking at least one door or a trunk or operating other welcome features on a vehicle, comprising steps of: initiating a wireless connection between a smartphone and the vehicle when the smartphone is within a communication range from the vehicle, wherein the wireless connection is used to track a distance between the smartphone and the vehicle; transmitting a wake-up signal from the vehicle to the key fob when the smartphone is within a second communication range from the vehicle, the second communication range being less than the first communication range; receiving ultra-wideband (UWB) signals from the key fob to determine a position of the key fob when the key fob is within the second communication range; and activating a remote feature on the vehicle when the key fob is within an authorization zone of the vehicle.
- A sample embodiment of the disclosure is set forth in the following description, is shown in the drawings and is particularly and distinctly pointed out and set forth in the appended claims. The accompanying drawings, which are fully incorporated herein and constitute a part of the specification, illustrate various examples, methods, and other example embodiments of various aspects of the invention.
-
FIG. 1 is in accordance with the present disclosure showing a system for unlocking at least one door or a trunk or operating welcome features on a vehicle; -
FIG. 2 is an exemplary schematic view of the vehicle door unlocking system showing that a smartphone and a vehicle key fob is located outside of a first vehicle communication range; -
FIG. 3 is an exemplary schematic view of the vehicle door unlocking system showing that the smartphone and key fob is located inside of the first vehicle communication range but outside of a second vehicle communication range; -
FIG. 4 is an exemplary schematic view of the vehicle door unlocking system showing that both the smartphone and the key fob are located inside of the second vehicle communication range; -
FIG. 5 is a first block diagram to implement a proposed method for unlocking a vehicle door and operating other welcome features on the vehicle; -
FIG. 6 is a second block diagram to implement a proposed method for unlocking a vehicle door and operating other welcome features on the vehicle; and -
FIG. 7 is a third block diagram to implement a proposed method for unlocking a vehicle door and operating other welcome features on the vehicle. - Similar numbers refer to similar parts throughout the drawings.
- As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various and alternative forms. The figures are not necessarily to scale; some features may be exaggerated or minimized to show details of particular components. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.
- The current disclosure relates to a vehicle passive keyless entry system that is triggered by a smartphone proximity detection to remotely operate a vehicle locking and unlocking system or wake up other features on the vehicle. The distance between a vehicle and a user carrying both a smartphone and a key fob may be measured. The distance between the smartphone and the vehicle may be measure based on signal strength, time-of-flight (ToF), or acceleration sensors when the user approaches the vehicle and the smartphone becomes within the range of Wi-Fi or Bluetooth communication. A wakeup signal may be sent to the key fob to activate distance tracking between the key fob and the vehicle when the person walks closer to the vehicle. As the user becomes within the range of accurate low frequency (LF) or ultra-wide band (UWB) ToF distance determination between the key fob and a base station, the location of the key fob is determined to be suitable for door unlock. These aspects and others will be described in more detail below.
- As depicted in
FIG. 1 , a passivevehicle entry system 10 may comprise avehicle communication system 12, avehicle key fob 14 and asmartphone 16. Thevehicle communication system 12 may include a tele-communication device which has capability of transmitting and/or receiving signals through Wi-Fi, Bluetooth, 2G, 3G, or LTE etc. Thecommunication system 12 may be located inside of avehicle 18. In one embodiment, thecommunication system 12 may include at least onereceiver 19, at least onetransmitter 20, and at least onecontroller 22. In another embodiment, thereceiver 19 and thetransmitter 20 can be replaced by a transceiver (not shown) which can receive and transmit signals. Thevehicle communication system 12 may be connected to anunlocking device 24 of thevehicle 18 to open at least one vehicle door. Thecommunication system 12 can be further connected to aremote start device 26 to start an engine or and analarming device 28 to make alerting sound. In another embodiment, it is understood that thecommunication system 12 can be located outside of thevehicle 18 and can be controlled by a remote controller (not shown inFIG. 1 ). - As depicted in
FIG. 1 , thesmartphone 16 may include acommunication device 30 and aproximity sensor 32. Thecommunication device 30 may allow thesmartphone 16 to be wirelessly connected to thevehicle 18 using any communication method, including but not limited to Wi-Fi, Bluetooth, 2G, 3G, or LTE so that thevehicle 18 is in electrical communication with thesmartphone 16 once thesmartphone 16 is located within a vehicle communication range. A typical vehicle communication range using Wi-Fi or Bluetooth between thevehicle 18 and thesmartphone 16 may be from about 10 to about 30 meters. However, in another embodiment, the vehicle communication range may be less than about 10 meters or more than about 30 meters. Thevehicle key fob 14 may include acommunication device 34, which allows connection with thevehicle 18 to transmit and/or receive signals back and forth. In this embodiment, thesmartphone 16 may not be in direct communication with thevehicle key fob 14. However, in another embodiment, thesmartphone 16 can be in direct communication with thevehicle key fob 14 so that thesmartphone 16 and thekey fob 14 can transmit and/or receive signals back and forth. - As depicted in
FIGS. 2 and 5 , a process of unlocking a least one vehicle door or a trunk using the passivevehicle entry system 10 is illustrated. As shown inFIG. 2 , initially, a user (not shown inFIG. 2 ) holding thesmartphone 16 and thevehicle key fob 14 may be located outside of a firstvehicle communication range 36 and a secondvehicle communication range 38. The firstvehicle communication range 36 may be defined where thesmartphone 16 is in wireless communication with thevehicle 18 to transmit and/or receive signals or information back and forth. Furthermore, the secondvehicle communication range 38 may be defined where thevehicle key fob 14 is in wireless communication with thevehicle 18 to transmit and/or receive signals or information back and forth. The firstvehicle communication range 36 may be greater than the secondvehicle communication range 38. - As shown in
FIG. 3 , as the user (not shown) holding thesmartphone 16 and thevehicle key fob 14 approaches the firstvehicle communication range 36, theproximity sensor 32 on thesmartphone 16 may detect the distance between thesmartphone 16 and thevehicle 18. If the distance between thesmartphone 16 and thevehicle 18 is within the firstvehicle communication range 36, then thevehicle 18 and thesmartphone 16 may initiate communication to share the distance information between thevehicle 18 and thesmartphone 16. The distance information between thevehicle 18 and thesmartphone 16 may be carried by either Wi-Fi or Bluetooth connection. In another embodiment, the distance information can be carried by any other existing tele-communication means. Once Wi-Fi or Bluetooth connection is established, thesmartphone 16 may start processing Time-of-Flight (ToF) of radio wave measurement, triangulation, trilateration, and/or Received Signal Strength Indicator (RSSI) to determine distance between thesmartphone 16 and thevehicle 18. In another embodiment, thevehicle 18 may start processing Time-of-Flight of radio wave measurement, triangulation, trilateration, and/or Received Signal Strength Indicator to determine distance between thesmartphone 16 and thevehicle 18. - Time-of-Flight (ToF) is a property of an object, particle or acoustic, electromagnetic or another wave. It refers to the time that such an object needs to travel a distance through a medium. Tracking ToF of a known signal between two sources, therefore, can be used to determine the distance between those sources. According to one or more embodiments of the present disclosure, distance tracking between the smartphone 16 (or key fob 14) and the
vehicle 18 may be accomplished by applying ToF to ultra-wideband (UWB) signals, Wi-Fi signals, global positioning system (GPS) signals, or the like. - With the advent of multiple vehicle antennas (e.g., multiple Wi-Fi antennas), it is possible to estimate the angle of arrival of the multipath signals received at the antenna arrays, and apply triangulation or trilateration to calculate the location of a devices, such as a smartphone or a key fob. The triangulation or trilateration technique using Wi-Fi or UWB signals may be employed to track the position of the smartphone 16 (or key fob 14) against the
vehicle 18, according to one or more embodiments of the present disclosure. - RSSI is a measurement of the power present in a received radio signal. RSSI localization techniques are based on measuring signal strength from a client device to several different access points, and then combining this information with a propagation model to determine the distance between the client device and the access points. According to one or more embodiments, RSSI may be employed either alone or in combination with other distance tracking techniques to determine the location of the smartphone 16 (or key fob 14) in relation to the
vehicle 18 - As depicted in
FIG. 4 , the user (not shown) holding thesmartphone 16 and the vehiclekey fob 14 may continue approaching thevehicle 18 and cross within the secondvehicle communication range 38. Once the distance between thevehicle 18 and thesmartphone 16 becomes within, e.g., 2 to 3 meters, a vehicle key fob wakeup process may be initiated by thevehicle communication system 12 utilizing either Low Frequency (LF), Ultra High Frequency (UHF), or Super High Frequency (SHF) communication so that the vehiclekey fob 14 is electrically ready to transmit signals to thevehicle 18 or receive signals from thevehicle 18. In another embodiment, the vehicle key fob wakeup process can be initiated as the distance between thevehicle 18 and thesmartphone 16 is less than 2 meters or greater than 3 meters. This process may be determined by predicted possibility of wakeup (i.e. wakeup signal believed to be reaching the key fob) and predicted possibility that the vehiclekey fob 14 will be able to call thevehicle 18 reliably and continuously. The LF, UHF or SHF communication of the vehicle key fob wakeup process is typical for passive entry systems that can “wake up” the vehiclekey fob 14 from ultra-low power mode, where the vehicle side may introduce the pulses with high enough power to be able to produce high enough level of power to energize otherwise depowered circuits of the vehiclekey fob 14. - Once awake, the
key fob 14 will continue communication to thevehicle 18 for distance measurement using either LF communication, UWB communication, or both. The nature of distance measurement using LF communication is different from UWB communication. LF distance measurement communication uses RSSI, while UWB distance measurement communication relies on ToF. LF uses more energy to transmit than to receive. Therefore, thevehicle 18 may initiate LF distance measurement communication between the vehicle and thekey fob 14. UWB communication uses less energy than LF communication. Accordingly, thekey fob 14 may initiate UWB distance measurement communication with thevehicle 18. Distance measurement requires an exchange of signals between the key fob and the vehicle. Due to specific properties of LF or UWB distance measurement communication, the distance between the antennas of the vehiclekey fob 14 and the antennas of thevehicle 18 can be determined reliably with the accuracy of up to 2.5 centimeters, helping determine whether thekey fob 14 is located within the boundary of apredefined authorization zone 40. -
FIGS. 5-7 show various flow charts depicting methods in accordance with various embodiments of the present disclosure. As depicted inFIG. 5 , afirst method 100 to implement the proposed communication with a vehicle using a vehicle key fob and a smartphone is provided. At astep 102, wireless communication may be initiated between thesmartphone 16 and thevehicle 18 when the smartphone is located within a first vehicle range. The first vehicle range may be defined as a distance between thesmartphone 16 and thevehicle 18 where thesmartphone 16 and thevehicle 18 can wirelessly communicate using Wi-Fi, Bluetooth, or the like. Initiating wireless communication with thesmartphone 16 may involve the vehicle determining whether thesmartphone 16 is located within the first vehicle range. In an embodiment, thesmartphone 16 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) that can be picked up by thereceiver 19 indicating thesmartphone 16 is within the first vehicle range. In another embodiment, thevehicle 18 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) via thetransmitter 20 that can be picked up by thesmartphone 16 when thesmartphone 16 is within the first vehicle range. Thereceiver 19 may then receive a confirmation signal from thesmartphone 16 confirming to thevehicle 18 that thesmartphone 16 is within the first vehicle range. In an embodiment, the first vehicle range me be about 10-30 meters. - Initiating wireless communication between the
smartphone 16 and thevehicle 18 may trigger thevehicle 18 to begin transmitting a wake-up signal for thekey fob 14, as provided atstep 104. Accordingly, thevehicle 18 may transmit a wake-up signal to the vehiclekey fob 14 to wake up thekey fob 14 when it is within a second vehicle range. The second vehicle range may be defined as a distance between thekey fob 14 and thevehicle 18 where the key fob can successfully receive the wake-up signal and transition from a low energy mode to a normal energy mode to be ready to communicate with thevehicle 18. In an embodiment, the second vehicle range may be about 2-3 meters. The wake-up signal may be a low-frequency signal. To this end, thetransmitter 20 may transmit a low-frequency signal capable of activating thekey fob 14 when it is within the second vehicle range. Alternatively, the wake-up signal to thekey fob 14 from thevehicle 18 may be a UHF or SHF signal. - Waking up the
key fob 14 may activate a UWB circuit or transmitter (not shown) in thekey fob 14 for exchanging UWB signals with thevehicle 18 to track the distance therebetween and locate the key fob with respect to the vehicle. Accordingly, at astep 106, a UWB exchange may be initiated between thekey fob 14 and thevehicle 18 to measure a distance between the key fob and the vehicle in response to waking up the key fob. The UWB exchange may at least include receiving at the vehicle 18 a first UWB signal from thekey fob 14 to initiate distance tracking, transmitting from the vehicle 18 a second UWB signal to thekey fob 14, and receiving at the vehicle 18 a third UWB signal from thekey fob 14 in response to the second UWB signal. Thevehicle 18 may determine the distance between thekey fob 14 and thevehicle 18 by applying time-of-flight (ToF) measurement of the UWB signals being exchanged, as provided atstep 108. In another embodiment, distance or location tracking of thekey fob 14 with respect to the vehicle may be accomplished using Wi-Fi or UWB triangulation or trilateration. - At a
step 110, when it is determined that thekey fob 14 is located within one or more predefined authorization zones around thevehicle 18, a remote feature on the vehicle may be operated. For example, thevehicle 18 may automatically unlock at least one door or a trunk if it detects thekey fob 14 within an authorization zone. A predefined authorization zone may be a predetermined three-dimensional geometric space or zone. Other remote features on thevehicle 18 that may be operated include opening a tail gate, opening a door, turning on ambient lights or head lights, or starting an engine. A particular remote feature may be operated when thekey fob 14 is within a particular predefined authorization zone. For example, a predefined authorization zone may be assigned to the front left door of the vehicle. Accordingly, the vehicle may unlock the front left door of thevehicle 18 when thekey fob 14 is located within the front left door zone. In an embodiment, a predefined authorization zone may be located from 0 to 1.5 meters from an external surface of the vehicle. In another embodiment, a predefined authorization zone can include space greater than 1.5 meters from the vehicle's external surface. - Alternatively, the
vehicle 18 may operate a remote feature when a pattern of sequential geometric locations describes thekey fob 14 approaching the vehicle. For instance, the vehicle may open a door when the vehicle detects akey fob 14 approaching the vehicle from behind based on the pattern of sequential geometric locations. However, the vehicle may be reluctant to open a door when it detects thekey fob 14 is approaching the vehicle from the front in order to prevent a user from striking the door or being hit by the door itself. - As depicted in
FIG. 6 , asecond method 200 to implement the proposed communication with a vehicle using a vehicle key fob and a smartphone is provided. Thekey fob 14 and thesmartphone 16 may be remotely located from thevehicle 18. Moreover, all doors or a trunk of thevehicle 18 may already be locked, and other features on thevehicle 18 such as welcoming features (i.e., ambient lights or head lights etc.) may already be turned off. At astep 202, a wireless connection between thesmartphone 16 and thevehicle 18 may be established. For instance, the wireless connection may be established when a first distance between the smartphone and the vehicle is within a first pre-determined distance value. The first pre-determined distance value may be defined as a distance between thesmartphone 16 and thevehicle 18 where thesmartphone 16 and thevehicle 18 can wirelessly communicate using Wi-Fi, Bluetooth, or the like. Establishing a wireless connection with thesmartphone 16 may involve the vehicle determining whether thesmartphone 16 is located within the first pre-determined distance value. In an embodiment, thesmartphone 16 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) that can be picked up by thereceiver 19 indicating thesmartphone 16 is within the first pre-determined distance value. In another embodiment, thevehicle 18 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) via thetransmitter 20 that can be picked up by thesmartphone 16 when thesmartphone 16 is within the first pre-determined distance value. Thereceiver 19 may then receive a confirmation signal from thesmartphone 16 confirming to thevehicle 18 that thesmartphone 16 is within the first pre-determined distance value. - Additionally, or alternatively, the first distance between the
vehicle 18 and thesmartphone 16 may be measured. In this step, a user/driver holding thesmartphone 16 and the vehiclekey fob 14 may approach thevehicle 18. As the driver/user holding thesmartphone 16 and the vehiclekey fob 14 approaches thevehicle 18, theproximity sensor 32 on thesmartphone 16 may detect proximity to thevehicle 18 and establish the wireless connection to the vehicle when the first distance is within the pre-determined distance value. In one embodiment, the first pre-determined distance value may be from about 10 to about 30 meters. However, in another embodiment, the first pre-determined distance can be less than 10 meters and greater than 30 meters. At thestep 202, if the first distance is within the first pre-determined distance value (i.e, from 10 to 30 meters), then thevehicle 18 and thesmartphone 16 may initiate electrical tele-communication (i.e., wireless connection) between them. For instance, thevehicle 18 may communicate with the smartphone via itsreceiver 19 and transmitter 20 (which may be combined to form a transceiver). The tele-communication may be established using Bluetooth or Wi-Fi connection. However, in another embodiment, the tele-connection between thevehicle 18 and thesmartphone 16 can be established using any other tele-communication methods. - At a
step 204, a second distance between thevehicle 18 and thesmartphone 16 may be measured to determine whether the second distance between thevehicle 18 and thesmartphone 16 is within a second pre-determined distance value. In one embodiment, the second pre-determined distance value may be about 3 meters. In another embodiment, the second pre-determined distance value can be less or greater than 3 meters. At thestep 204, measuring the second distance between thesmartphone 16 and thevehicle 18 may be accomplished by applying ToF using GPS, Wi-Fi or UWB and/or Received Signal Strengthen Indicator (RSSI) between thesmartphone 16 and thevehicle 18. Alternatively, measuring the second distance between thesmartphone 16 and thevehicle 18 may be accomplished by applying Wi-Fi or UWB triangulation or trilateration. At astep 206, if the second distance between thevehicle 18 and thesmartphone 16 is less than the second pre-determined distance value (i.e. 3 meters), thevehicle 18 may transmit a wake-up signal to the vehiclekey fob 14 held by the driver/user to activate the vehiclekey fob 14 to be ready for communication with thevehicle 18. Activating thekey fob 14 may be accomplished by triggering a wakeup request (e.g., either LF, UHF, or SHF). Waking up thekey fob 14 may activate, for example, an ultra-wideband (UWB) circuit or transmitter (not shown) in thekey fob 14 for exchanging UWB signals with thevehicle 18 to track the distance therebetween and locate the key fob with respect to the vehicle. - At a
step 208, a location of thekey fob 14 with respect to an authorization zone, defined by a distance between thekey fob 14 and thevehicle 18, may be measured or otherwise detected. The location of thekey fob 14 around thevehicle 18 may be measured by applying ToF using GPS, Wi-Fi, UWB, or the like. As previously described, a UWB exchange may be initiated between thekey fob 14 and thevehicle 18 to determine an orientation or location of the key fob against the vehicle using ToF of the radio signal between the key fob and one or more vehicle antennas. When thekey fob 14 is located within an appropriate predefined authorization zone, thevehicle 18 may activate a function within the vehicle (e.g., unlock at least one door for thevehicle 18, unlatch a trunk of thevehicle 18, or the like), as provided at astep 210. In an embodiment, the authorization zone may be approximately defined as a 1.5-meter radius around a particular vehicle door or tailgate. The authorization zone may have a three-dimensional spherical or cubic shaped attached to a left, right, and/or rear side of thevehicle 18. In addition to unlocking a vehicle door or unlatching a trunk, the vehicle function invoked may include other welcome features such as opening a tailgate, turning on ambient lights or head lights, or starting an engine for thevehicle 18. - As depicted in
FIG. 7 , athird method 300 to implement the proposed communication with a vehicle using a vehicle key fob and a smartphone is provided. Thesmartphone 16 and the vehiclekey fob 14 may be initially located out of a first communication range from thevehicle 18. A driver/user who holds thesmartphone 16 and the vehiclekey fob 14 may bring thesmartphone 16 and the vehiclekey fob 14 within the first communication range with thevehicle 18. Accordingly, atstep 302, a wireless connection between thesmartphone 16 and thevehicle 18 may be initiated. For instance, the wireless connection may be initiated when thesmartphone 16 is within the first communication range of thevehicle 18. The first communication range may be defined as a distance between thesmartphone 16 and thevehicle 18 where thesmartphone 16 and thevehicle 18 can wirelessly communicate using Wi-Fi, Bluetooth, or the like. Initiating a wireless connection with thesmartphone 16 may involve thevehicle 18 determining whether thesmartphone 16 is located within the first communication range. In an embodiment, thesmartphone 16 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) that can be picked up by thereceiver 19 indicating thesmartphone 16 is within the first communication range. In another embodiment, thevehicle 18 may transmit a wireless communication signal (e.g., Wi-Fi, Bluetooth, etc.) via thetransmitter 20 that can be picked up by thesmartphone 16 when thesmartphone 16 is within the first communication range. Thereceiver 19 may then receive a confirmation signal from thesmartphone 16 confirming to thevehicle 18 that thesmartphone 16 is within the first communication range. In one embodiment, the first communication range between thesmartphone 16 and thevehicle 18 may be less than about 30 meters. In another embodiment, the first communication range can be less than less than about 20 meters. In yet another embodiment, the first communication range can be less than about 10 meters. - Distance tracking may be employed by virtue of the wireless connection between the
smartphone 16 and thevehicle 18 to track the distance between the smartphone and the vehicle. Accordingly, at astep 304, thevehicle 18 may exchange distance tracking signals with thesmartphone 16. The distance tracking may be accomplished by ToF (using GPS, Wi-Fi, UWB, or the like), trilateration or triangulation (using UWB or Wi-Fi). As a driver/user holding thesmartphone 16 and the vehiclekey fob 14 continues to approach thevehicle 18, the driver/user may bring thesmartphone 16 and the vehiclekey fob 14 within a second communication range of thevehicle 18. The second communication range may be less than the first communication range. In one embodiment, the second communication range may be about 3 meters. In another embodiment, the second communication range can be less than or greater than 3 meters. At astep 306, once it is determined that thesmartphone 16 is located within the second communication range of thevehicle 18, the vehicle may transmit a wake-up signal to thekey fob 14 to wake up the key fob from a sleep state to an active state. At thestep 306, the wake-up signal to the key fob may be accomplished by wirelessly transmitting a short-range (low frequency) signal from thevehicle 18. In response to waking up, thekey fob 14 may begin transmitting UWB signals to thevehicle 18 - At
step 308, thevehicle 18 may receive the UWB signals from thekey fob 14 once it is determined that thesmartphone 16 is located within the second communication range of thevehicle 18. Accordingly, a UWB exchange may be initiated between thekey fob 14 and thevehicle 18 to track the distance between the key fob and the vehicle. At astep 310, thevehicle 18 may activate a remote vehicle function when thekey fob 14 is within an authorization zone of thevehicle 18. In an embodiment, the authorization zone may be approximately defined as a 1.5-meter radius around a particular vehicle door or tailgate. The authorization zone may have a three-dimensional spherical or cubic shaped attached to a left, right, and/or rear side of thevehicle 18. In another embodiment, the authorization zone may be less than or greater than 1.5 meters. The remote vehicle function may include unlocking at least one door or trunk on thevehicle 18, opening a tailgate, turning on at least one light, or starting an engine. - While exemplary embodiments are described above, it is not intended that these embodiments describe all possible forms of the invention. Rather, the words used in the specification are words of description rather than limitation, and it is understood that various changes may be made without departing from the spirit and scope of the invention. Additionally, the features of various implementing embodiments may be combined to form further embodiments of the invention.
Claims (20)
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CN109889989A (en) | 2019-06-14 |
US10576932B2 (en) | 2020-03-03 |
US10328900B1 (en) | 2019-06-25 |
US20190275986A1 (en) | 2019-09-12 |
DE102018220857A1 (en) | 2019-06-06 |
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