WO2022167543A1

WO2022167543A1 - Control system and method

Info

Publication number: WO2022167543A1
Application number: PCT/EP2022/052622
Authority: WO
Inventors: Howard SISWICK; David Waddell
Original assignee: Jaguar Land Rover Limited
Priority date: 2021-02-05
Filing date: 2022-02-03
Publication date: 2022-08-11
Also published as: EP4288945A1; GB202101641D0; GB2603506A

Abstract

Aspects of the present invention relate to a control system (1) having one or more controller (21) for communicating with a device (2-n). The control system (1) is configured to broadcast at least a first polling signal (PS-n) to initiate a communication with the device (2-n). The control system (1) receives a response signal (IDS-n) from the device (2-n); and identifies the device (2-n) in dependence on the response signal (IDS-n). The control system (1) is configured to implement a first polling mode (PM-n) to initiate the communication with the device (2-n); and to implement a second polling mode (PM-n) after identification of the device (2-n). Aspect of the present invention also relate to a vehicle (3) incorporating the control system (1); and a method of communicating with a device (2-n); and a non-transitory computer-readable medium.

Description

CONTROL SYSTEM AND METHOD

TECHNICAL FIELD

The present disclosure relates to a control system and method. More particularly, but not exclusively, the present disclosure relates to a control system and method for use in a vehicle to provide adaptive communication with an external device, such as an electronic key. Aspects of the invention relate to a control system, a vehicle, a method and a non-transitory computer- readable medium.

BACKGROUND

It is known to provide a vehicle access system that tracks the approach of a hand-held device, such as a key fob or smart device. It is desirable for the vehicle access system to react promptly when a known device is detected. The vehicle access system performs polling to identify any such devices within a range of the vehicle. The polling comprises transmitting a polling signal to interrogate the hand-held device. The hand-held device transmits a response signal by way of response to the polling signal. This polling should be performed as quickly as can be tolerated by the vehicle to facilitate the required functionality. However, continued polling at a high rate may result in higher power consumption both by the vehicle and the hand-held device. This may deplete the vehicle battery and also the battery in the hand-held device.

It is an aim of the present invention to address one or more of the disadvantages associated with the prior art.

SUMMARY OF THE INVENTION

Aspects and embodiments of the invention provide a control system, a vehicle, a method and a non-transitory computer- readable medium as claimed in the appended claims.

According to an aspect of the present invention there is provided a control system comprising one or more controller for communicating with a device, the control system configured to: broadcast at least a first polling signal to initiate a communication with the device; receive a response signal from the device; and identify the device in dependence on the response signal; wherein the control system implements a first polling mode to initiate the communication with the device; and implements a second polling mode after identification of the device. At least in certain embodiments, the control system may be used in a vehicle, for example to control one or more vehicle systems. The control system may be incorporated into a vehicle access system for controlling access to a vehicle. The device may be an electronic key, such as a key fob or a smart device, for controlling access to the vehicle. The device may be a portable device which is movable independently of the vehicle. The device may be a hand-held device which can be carried by an individual. The device may, for example, be in the form of a key fob or a smart device. The device may be suitable for controlling one or more vehicle system. The device may be an electronic key for controlling access to the vehicle.

The first polling signal may be broadcast as a wireless signal, for example as a radio frequency (RF) signal. A transmitter may be provided for transmitting the first polling signal. A receiver may be provided for receiving the response signal from the device. The transmitter and the receiver may be incorporated into the control system or may be connected to the control system.

At least in certain embodiments the first polling signal may be a general polling signal for initiating communication with all compatible devices.

The control system may be configured to identify the or each device. The or each device may be identified when the first polling mode is active. Optionally, the control system may determine a location of the or each device. The or each device may be configured to transmit location data to the control system. For example, each device may process the signal(s) broadcast by the control system to determine a relative location, for example by trilateration of the signals received from the control system. Alternatively, the control system may process the signal(s) broadcast by each device to determine a relative location, for example by trilateration of the signals received from the device. The location of the or each device may be determined when the second polling mode is active.

The second polling mode may comprise broadcasting a second polling signal. The second polling signal may be a specific polling signal, for example specific to one or more device. The second polling signal may be specific to one or more device which have previously been identified by the control system. For example, the one or more device may have been identified during the first polling mode.

The first polling mode may be implemented to monitor or search for the at least one device. The second polling mode may be implemented after identification of the at least one device.

The one or more controller may comprise at least one electronic processor having an electrical output for outputting at least the first polling signal; and at least one input for receiving the response signal from the device. At least one memory device having instructions stored therein may be electrically coupled to the at least one electronic processor. The at least one electronic processor may be configured to select one of the first polling mode and the second polling mode.

The first polling mode may comprise a first polling rate for transmitting the first polling signal. Alternatively, or in addition, the second polling mode may comprise a second polling rate for transmitting the first polling signal. The first and second polling rates may be different from each other. At least in certain embodiments, the first polling rate may be greater than the second polling rate. The first polling signal may be transmitted in the first and second polling modes. For example, the first polling signal may be at least substantially the same in the first and second polling modes. However, the time interval between transmission of consecutive first polling signals may be different in the first and second polling modes. The first polling rate may comprise a first time interval between transmission of the consecutive first polling signals. The second polling rate may comprise a second time interval between transmission of the consecutive polling signals. The first time interval may be less than or greater than the second time interval. Varying the polling rate between the first and second polling modes can help to reduce power consumption.

In certain embodiments, the second polling rate may be greater than the first polling rate. The second polling mode may be implemented to determine the location of the device. At least in certain embodiments, increasing the second polling rate, may enable the location of the device to be determined more quickly. After determining the location of the device, the control system may implement a third polling mode. The third polling mode may comprise a third polling rate for transmitting the first polling signal. The third polling rate may be less than the first polling rate and/or the second polling rate.

The second polling mode may comprise generating a device sleep request for transmission to the device to attenuate generation of the response signal. The device sleep request may instruct the device to reduce or inhibit generation of the response signal. This may reduce power consumption in the device. The control system may be configured to identify a plurality of devices. The device sleep request may be targeted at a particular one of the identified devices. The device sleep request may be targeted at a sub-set of the identified devices. The or each device sleep request may be targeted at one or more specific device. The or each device sleep request may be device specific. The or each device sleep request may relate to a particular device.

The device sleep request may comprise a device identifier associated with the particular one of the devices. The device identifier may be unique to that device.

The device sleep request can thereby be targeted at one or more specific device. The device identifier may be accessed when the device is acquired, for example as part of an initial hand-shake operation.

The control system may be configured to generate a second polling signal. The first and second polling signals may be different from each other. The second polling signal may comprise the device sleep request.

The second polling mode may comprise transmitting the device sleep request. The second polling mode may comprise periodically transmitting the first polling signal. This approach may, for example, identify one or more device not present (i.e. absent) during the first polling mode.

The control system may be configured to generate a device wake-up request for transmission to the device to amplify generation of the response signal.

The polling signal can be modified to avoid deleterious effects on other hand-held devices proximal to the vehicle but not associated with the vehicle. The polling signal may be modified to target one or more specific device, or to command one or more specific device not to respond. In the case of previously acquired devices that are not required to respond, a wake-up polling message can be tailored to ensure that peripheral devices do not respond. A periodic check of the excluded devices may optionally be undertaken to check that the conditions for exclusion are still applicable.

The or each device wake-up request may be targeted at one or more specific device. The device wake-up request may be associated with a one or more particular device acquired by the processor. The control system may be configured to determine a range to the device. The control system may generate the device wake-up request in dependence on the determined distance to the device, for example with the determined distance is within a range. The range may be predetermined. The device may comprise an electronic key for accessing the vehicle. The electronic key may comprise a key fob, for example.

Alternatively, the device may comprise a cellular telephone or the like.

According to a further embodiment of the present invention there is provided a control system comprising one or more controller for communicating with a device, the control system being configured to: broadcast at least a first polling signal to communicate with the device; wherein the control system is configured selectively to implement one of at least a first polling mode and a second polling mode for communicating with the device.

According to a further embodiment of the present invention there is provided a control system comprising one or more controller for communicating with a device, the control system being configured to: broadcast at least a first polling signal to communicate with the device; wherein the control system is configured to modify a polling rate of the first polling signal broadcast to the device. The control system may be configured selectively to broadcast the first polling signal at a first polling rate and a second polling rate, the first and second polling rates being different from each other. The second polling rate may be higher than the first polling rate. The first and second polling rates may be predefined, for example in respective first and second polling modes. Alternatively, the first and second polling rates may be determined dynamically, for example by modifying a time interval between transmission of consecutive first polling signals. The control system may selectively implement a third polling rate.

The control system may be configured to modify the polling rate in dependence on an interruption in communication with the device. The control system may implement the second polling rate in dependence on an interruption in the communication with the device.

The control system may be configured to determine a location of the device. The control system may be configured to modify the polling rate in dependence on the location of the device. The control system may be configured to broadcast the first polling signal at the first polling rate when the device is in a low polling rate zone. The control system may be configured to broadcast the first polling signal at the second polling rate when the device is in a high polling rate zone. The low polling rate zone and/or the high polling rate zone may be predefined. The control system may implement the second polling rate in dependence on an interruption in the communication with dthe device. The control system may implement the second polling rate if the location of the device is no longer available (i.e. the device is lost).

According to a further embodiment of the present invention there is provided a vehicle comprising the control system described herein. The vehicle may be a road vehicle, such as an automobile.

According to a further embodiment of the present invention there is provided a method of communicating with a device, the method comprising: broadcasting at least a first polling signal to initiate a communication with the device; receiving a response from the device; and identifying the device in dependence on the response; wherein the method comprises implementing a first polling mode to initiate the communication with the device; and implementing a second polling mode after identification of the device.

The first polling mode may comprise a first polling rate for transmitting the first polling signal. The second polling mode may comprise a second polling rate for transmitting the first polling signal. The first and second polling rates may be different from each other.

The first polling rate may be greater than the second polling rate.

The second polling mode may comprise generating a device sleep request for transmission to the device to attenuate generation of the response signal.

The method may comprise identify a plurality of devices. The device sleep request may be targeted at a particular one of the devices. The device sleep request may comprise a device identifier associated with the particular one of the devices.

The method may comprise generating a second polling signal. The second polling signal may comprise the device sleep request.

The second polling mode may comprise transmitting the device sleep request.

The second polling mode may comprise periodically transmitting the first polling signal.

The method may comprise generating a device wake-up request for transmission to the device to amplify generation of the response signal.

The method may comprise determining a distance to the device. The device wake-up request may be generated when the determined distance to the device is within a range. The range may be predetermined.

According to a further embodiment of the present invention there is provided a method of communicating with a device, the method comprising: implementing a first polling mode to identify one or more device; and implementing a second polling mode after identification of the one or more device.

According to a further embodiment of the present invention there is provided a method of communicating with a device, the method comprising: broadcasting at least a first polling signal to communicate with the device; and wherein the method comprises selectively implementing one of at least a first polling mode and a second polling mode for communicating with the device. According to a further embodiment of the present invention there is provided a method of communicating with a device, the method comprising: broadcasting at least a first polling signal to communicate with the device; and modifying a polling rate of the first polling signal broadcast to the device.

According to a further aspect of the present invention there is provided a non-transitory computer-readable medium having a set of instructions stored therein which, when executed, cause a processor to perform the method described herein.

Within the scope of this application it is expressly intended that the various aspects, embodiments, examples and alternatives set out in the preceding paragraphs, in the claims and/or in the following description and drawings, and in particular the individual features thereof, may be taken independently or in any combination. That is, all embodiments and/or features of any embodiment can be combined in any way and/or combination, unless such features are incompatible. The applicant reserves the right to change any originally filed claim or file any new claim accordingly, including the right to amend any originally filed claim to depend from and/or incorporate any feature of any other claim although not originally claimed in that manner.

BRIEF DESCRIPTION OF THE DRAWINGS

One or more embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

Figure 1 shows a schematic representation of a vehicle comprising a control system for communicating with a device in accordance with an embodiment of the present invention;

Figure 2 shows a schematic representation of an aperture closure member incorporating a lock mechanism for actuation in dependence on a control signal output by the control system shown in Figure 1;

Figure 3 shows a schematic representation of the control system shown in Figure 1; and Figure 4 shows a block diagram representing operation of the control system.

DETAILED DESCRIPTION

A control system 1 for providing adaptive polling of one or more device 2-n in accordance with an embodiment of the present invention will now be described with reference to the accompanying figures. The control system 1 controls generation of a polling signal PS-n which is transmitted automatically to interrogate the one or more device 2-n. The polling signal PS-n is generated to identify the presence of the device 2-n within a predetermined range of the vehicle 3. The polling signal PS-n may optionally also be used to determine a location of the device 2-n.

The control system 1 in the present embodiment is incorporated into a remote access system for controlling access to the vehicle 3. The device 2-n is configured to provide remote control of one or more systems on the vehicle 3. In the present embodiment, the device 2-n functions as an electronic key and provides remote access to the vehicle 3. By way of example, the device 2-n may control locking and unlocking of the vehicle 3. The vehicle 3 in the present embodiment is an automobile, but the present invention can be implemented in other types of vehicle. As shown in Figure 1, the vehicle 3 comprises a plurality of apertures 5-n for ingress into and egress from the vehicle 3. A closure member 7-n is associated with each of the apertures 5-n. The apertures 5-n in the present embodiment are in the form of door openings; and the closure members 7-n are in the form of doors. The vehicle 3 comprises a front left first door 7-1, a front right second door 7-2, a rear left third door 7-3 and a rear right fourth door 7-4. A latch mechanism 9-n is associated with each of the closure members 7-n. The latch mechanism 9-n is operable to secure respective closure members 7-n. Each latch mechanism 9-n may, for example, comprise a latch member (not shown) for releasably engaging a door latch pin (not shown). Each latch mechanism 9-n can be controlled remotely, for example to provide a central locking function. Other types of latch mechanism 9-n are also contemplated.

The vehicle 3 comprises a plurality of handles 11-n disposed externally of the vehicle 3 and operable to actuate the latch mechanisms 9-n. The handles 11-n are each associated with a respective one of the latch mechanisms 11-n. The handles 11-n are manually operated in a conventional manner to release the associated latch mechanism 9-n, thereby enabling opening of the closure member 7-n. The handles 11-n may, for example, undergo a pivoting motion to actuate the latch mechanism 9-n. In the present embodiment, the handles 11 -n on the vehicle 3 have like configurations. For the sake of brevity, the first handle 11-1 will now be described. It will be understood that the other handles 11-n have the same configuration.

As shown in Figure 2, the first handle 11-1 is movably mounted in the first closure member 7-1. The first handle 11-1 is movable between a retracted position and a deployed position. The first handle 11-1 is disposed at least substantially within an interior of the first closure member 7-1 in the retracted position; and is disposed outside of the first closure member 7-1 in the deployed position. When disposed in the retracted position, the first handle 11-1 cannot be operated due to the limited access available. When disposed in the deployed position, the first handle 11-1 can be operated in a conventional manner to actuate the latch mechanism 9-n. The first handle 11-1 may, for example, be disposed in the retracted position to improve aerodynamic efficiency and/or to improve security. The first handle 11-1 is displaced to the deployed position to enable operation of the handle 11-1. The first handle 11-1 has an outer surface 13. When retracted, the outer surface 13 forms a continuation of the external profile of the first closure member 7-1. When extended, the outer surface 13 of the first handles 9-1 is offset outwardly from the external profile of the first closure member 7-1.

The first handle 11-1 is mounted on a handle deployment mechanism 15-1. The handle deployment mechanism 15-1 is operable selectively to displace the first handle 11-1 between the retracted position and the deployed position. The handle deployment mechanism 15-1 comprises an actuator 17 and a frame 19 for carrying the first handle 11-1. The handle deployment mechanism 15-1 is disposed in an interior of the first closure member 7-n. The actuator 17 actuates the frame 19 so as to displace the first handle 11-1 between the retracted position and the deployed position. The actuator 17 comprises an electromechanical actuator, such as a solenoid. The actuator 17 in the present embodiment is a two-way actuator enabling controlled retraction and deployment of the first handle 11-1. In a variant, the actuator 17 could be a one-way actuator which operates in conjunction with a biasing member controllably to retract and extend the first handle 11-1.

As shown in Figure 3, the system 1 comprises a controller 21 comprising at least one electronic processor 23 and a system memory 25. A set of computational instructions is stored on the system memory 25. When executed the instructions cause the at least one electronic processor 23 to perform the method(s) described herein. The at least one electronic processor 23 has an electrical input 23A; and at least one electrical output 23B. The controller 21 is configured to generate a polling signal PS-n.

The vehicle 3 comprises a vehicle transceiver 29 for transmitting and receiving a wireless radio frequency (RF) signal. The vehicle transceiver 29 in the present embodiment is an ultra-wideband transceiver. In a variant, the vehicle transceiver 29 may be Low Frequency (LF) transceiver or an Ultra High Frequency (UHF) transceiver. The vehicle transceiver 29 is configured to communicate with the or each device 2-n. The vehicle transceiver 29 is connected to at least one antenna 31 for transmitting and receiving a wireless radio frequency (RF) signal. In the illustrated arrangement, the vehicle transceiver 29 is connected to first and second antennas 31 A, 31 B disposed on the vehicle 3. The first and second antennas 31 A, 31 B are spaced apart from each other on the vehicle 3. The vehicle transceiver 29 is configured to broadcast the polling signal PS-n generated by the controller 21 in order to communicate with the device 2-n. The polling signal PS-n is transmitted by the vehicle transceiver 29 to initiate and maintain communication between the control system 1 and the device 2-n. In certain embodiments, the vehicle transceiver 29 may comprise a low energy system suitable for local (short-range) communications, for example to a establish a wireless personal area network. The low energy system may be configured to make an initial connection with the device 2-n. A suitable low energy system is Bluetooth (RTM) Low Energy. The vehicle transceiver 29 may be a dedicated device for communicating with the or each device 2-n. Alternatively, the vehicle transceiver 29 may perform other functions, such as determining with which satellite (SAT) to communicate.

The device 2-n is a portable device and is movable independently of the vehicle 3. The device 2-n comprises a device controller 35 and a device transceiver 37 for transmitting and receiving a wireless (RF) signal. The device transceiver 37 in the present embodiment is an ultra-wideband transceiver for communicating with the vehicle transceiver 29 disposed on the vehicle 3. The device controller 35 comprises a processor (not shown) and a memory system (not shown). In the present embodiment, the device 2-n functions as an electronic key for controlling locking and/or unlocking of the closure members 7-n. The device 2-n is authorised to control actuation of the latch mechanisms 9-n. The device 2-n may be authorised by establishing a preexisting association or digital connection with the vehicle 3, for example, by electronically pairing the device 2-n and the vehicle 3. In certain embodiments, the device transceiver 37 may comprise a low energy system suitable for local (short-range) communications, for example to a establish a wireless personal area network. A suitable low energy system is Bluetooth (RTM) Low Energy.

The device 2-n in the present embodiment is a dedicated electronic key, for example in the form of a key fob. In a variant, the device 2-n may be a general-purpose computational device, such as a cellular telephone. The cellular telephone may function as an electronic key, for example by confirming user identity. The device 2-n may be configured to execute a software application for communicating with the vehicle 3, for example to identify the device 2-n and to establish communication with the controller 21.

An electronic “handshake” function is performed to establish communication between the vehicle 3 and the device 2-n. The controller 21 is configured to generate the polling signal PS-n for transmission wirelessly by the vehicle transceiver 29 to the device 2-n. In use, the polling signal PS-n is received by the device 2-n via the device transceiver 37. In response to the polling signal PS-n, the device 2-n transmits an identification signal IDS-n to the vehicle transceiver 29. The identification signal IDS- n comprises a unique identification code which the controller 21 uses to identify the device 2-n. The controller 21 may thereby determine if the device 2-n is an authorised device having appropriate permissions to control systems on the vehicle 3, such as the latch mechanisms 9-n or the handle deployment mechanism 15-n. The controller 21 seeks to acquire one or more device 2-n authorised to operate in conjunction with the vehicle 3. The acquisition of the or each device 2-n comprises identifying the device and optionally also determining a location of the device 2-n in relation to the vehicle 3.

The controller 21 communicates with the device 2-n to determine a geospatial location of the device 2-n relative to the vehicle 3. The time-of-flight for transmission of signals between the vehicle transceiver 29 and the device transceiver 37 enables determination of a distance (range) to the device 2-n. By comparing the time-of-flight for signals transmitted by and/or received by the first and second antennas 31 A, 31 B, trilateration (true-range multilateration) can be used to determine a relative heading of the device 2-n. The determination of the range and/or the heading of the authorised device 2-n may be determined by the controller 21 and/or the device controller 35. Other techniques may be used to determine the geospatial location of the authorised device 2-n. For example, the geospatial location of the device 2-n may be determined by communicating with a satellite positioning system. The authorised device 2-n may transmit geospatial location data to the controller 21. The relative location of the authorised device 2-n and the vehicle 3 may then be determined. Alternatively, or in addition, the controller 21 may monitor a strength of the signal(s) received from the device transceiver 37. Alternatively, or in addition, the device controller 35 may monitor a strength of the signal(s) received from the vehicle transceiver 29. A distance between the vehicle 3 and the device 2-n may be determined in dependence on the signal strength. The controller 21 and/or the device controller 35 may determine the distance in dependence on the signal strength.

The controller 21 is configured to implement adaptive polling of the device 2-n. The adaptive polling comprises adjusting a rate at which the polling signal PS-n is transmitted. In the present embodiment, the controller 21 is configured to adapt transmission of the polling signal PS-n in dependence on identification of the device 2-n. Alternatively, or in addition, the controller 21 may be configured to adapt transmission of the polling signal PS-n in dependence on determination of a location of the device 2-n relative to the vehicle 3.

The controller 21 is configured to select one of a plurality of predefined polling modes PM-n. The polling modes PM-n in the present embodiment each have a different polling rate. The polling rate represents the rate at which the polling signal PS-n is transmitted. The number of transmissions of the polling signal PS-n within a given time period is different in each of the polling modes. The time interval between the transmission of consecutive polling signals PS-n is different in each polling mode. It will be understood that the location of the device 2-n may be determined in each of the plurality of predefined polling modes PM- n. However, the frequency with which the location is updated will vary in dependence on the polling rate. Thus, the rate with which the location of the device 2-n is updated (or refreshed) is different for each of the polling modes PM-n.

In the present embodiment, the controller 21 selects one of a first polling mode PM-1; a second polling mode PM-2; and a third polling mode PM-3. The first polling mode PM-1 has a first polling rate; the second polling mode PM-2 has a second polling rate; and the third polling mode PM-3 has a third polling rate. The first, second and third polling rates are different from each other. In the present embodiment, the first polling rate is a low polling rate (i.e. the first polling rate is less than the second and third polling rates); the second polling rate is an intermediate polling rate (i.e. the second polling rate is greater than the low polling rate and less than the fast polling rate); and the third polling rate is a high polling rate (i.e. the third polling rate is greater than the first and second polling rates). The third polling rate is greater than the second polling rate; and the second polling rate is greater than the first polling rate. The first polling mode PM-1 is selected to reduce power consumption; the second polling mode PM-2 is selected to detect the device 2; and the third polling mode PM-3 is selected to determine a location of the device 2-n. The first polling rate is applied when the control system 1 does not need to provide immediate (instantaneous) control, for example in a scenario in which the doors 5-n are already unlocked and/or the handles 11-n are deployed. The second polling rate is applied when the control system 1 is actively tracking the device 2-n and a short response time is required for the control of a vehicle system, such as unlocking the doors 5-n and/or deploying the handles 11-n in dependence on determination that a user has approached the vehicle 3. The third polling rate is applied when the control system 1 is attempting to re-establish communication with the device 2-n, for example following an interruption to the communication or a lost tracking function. The third polling rate is applied to reduce or minimise the time taken to re-locate the device 2-n.

The form of the polling signal PS-n may be at least substantially the same in each polling mode PM-n. In the present embodiment, the polling signals PS-n in each polling mode PM-n are at least substantially the same, but the time interval between the transmission of the polling signals PS-n is different in each polling mode PM-n. Increasing the time interval between transmission of consecutive polling signals PS-n reduces the number of polling signals transmitted in any given time period. Conversely, decreasing the time interval between transmission of consecutive polling signals PS-n increases the number of polling signals transmitted in any given time period. At least in certain embodiments, this can reduce power consumption by the controller 21 and/or the device 2-n. The control strategy implemented by the controller 21 to control selection of the first, second and third polling modes PM-1, PM-2, PM-3 will now be described with reference to Figure 4.

The controller 21 is configured to implement the second polling mode PM-2 as the default mode. In the present example, the controller 21 to detects the device 2-n while implementing the second polling mode PM-2. The controller 21 proceeds to determine the location of the device 2-n in relation to the vehicle 3. If the communication with the device 2-n is interrupted or the location of the device 2-n is subsequently lost, the controller 21 seeks to re-locate the device 2-n as quickly as possible. In order to expedite determination of the location of the device 2, the controller 21 is configured to change from the second polling mode PM-2 to the third polling mode PM-3 which has a higher polling rate (SW-A). The third polling mode PM-3 is maintained until expiry of a predetermined first time period, or the location of the device 2-n is determined (whichever happens first). If the location of the device 2-n is determined before expiry of the first time period, the controller 21 is configured to switch from the third polling mode PM-3 to the second polling mode PM-2 (SW-C). If the location of the device 2-n is not determined within the first time period, the controller 21 is configured to switch from the third polling mode PM-3 to the second polling mode PM-2 (SW-C).

The controller 21 is configured also to control the selection of one of the plurality of polling modes PM-n in dependence on a determined operating state of one or more other systems in the vehicle 3. For example, the polling mode PM-n may be selected in dependence on the operating state of the latch mechanisms 9-n and/or the handle deployment mechanisms 15-n. The controller 21 changes from the second polling mode PM-2 to the first polling mode PM-1 (SW-F) if the latch mechanisms 9-n are all unlocked (for example controlled by a central-locking function) and the handle deployment mechanisms 15-n are configured such that all of the handles 11-n are deployed. Since the latch mechanisms 9-n are unlocked and the handles 11- n are deployed, the lower polling rate provided by the first polling mode PM-1 provides an acceptable response time for controlling vehicle systems. In the present embodiment, the controller 21 changes from the first polling mode PM-1 to the second polling mode PM-2 (SW-E) if the latch mechanisms 9-n are all locked (for example in dependence on a lock request signal received from a central-locking system); and the handle deployment mechanisms 15-n are configured such that all of the handles 11-n are retracted. The higher polling rate provided by the second polling mode PM-2 is appropriate to provide a quicker response time, for example to enable the handle deployment mechanisms 15-n to deploy the handles 11-n.

The controller 21 continues to track the location of the device 2-n while the first polling mode PM-1 is selected. If the location of the device 2-n is lost, the controller 21 changes from implementing the first polling mode PM-1 to implementing the third polling mode PM-3 (SW-D). The third polling mode PM-3 is selected to expedite re-location of the device 2-n. The third polling mode PM-3 is maintained until expiry of a predetermined first time period, or the location of the device 2-n is determined (whichever happens first). If the location of the device 2-n is determined before expiry of the first time period, the controller 21 is configured to switch from the third polling mode PM-3 to the first polling mode PM-1 (SW-B). If the location of the device 2- n is not determined within the first time period, the controller 21 is configured to switch from the third polling mode PM-3 to the first polling mode PM-1 (SW-B).

The controller 21 in the present embodiment is configured to adjust the polling rate by selecting one of the first, second and third polling modes PM-1, PM-2, PM-3. The polling signal PS-n is unchanged in each of the first, second and third polling modes PM-1, PM-2, PM-3. Alternatively, or in addition, the controller 21 may be configured to output different polling signals PS-n in the first, second and third polling modes PM-1, PM-2, PM-3.

The control system 1 is configured to control operation of one or more of the latch mechanisms 9-n and one or more of the handle deployment mechanisms 15-n in dependence on the determined location of the device 2-n. The control system 1 outputs control signals CS-n for controlling the respective latch mechanisms 9-n and handle deployment mechanisms 15-n. The handle deployment mechanism(s) 15-n may be deployed and/or the latch mechanism(s) 9-n unlocked when the device 2-n is determined to be located inside a predetermined activation zone. Conversely, the handle deployment mechanism(s) 15-n may be retracted and/or the latch mechanism(s) 9-n locked when the device 2-n is determined to be located outside a predetermined activation zone. Other control strategies can usefully be implemented.

Alternatively, or in addition, the controller 21 may be configured to adapt transmission of the polling signal PS-n in dependence on the determined location of the device 2-n in relation to the vehicle 3. The controller 21 may be configured to reduce a polling rate when the determined location of the device 2-n corresponds to a predefined low polling rate zone. The low polling rate zone may, for example, comprise a region proximal to a bonnet of the vehicle 3. Alternatively, or in addition, the controller 21 may be configured to increase the polling rate when the determined location of the device 2-n corresponds to a predefined high polling rate zone. The high polling rate zone may, for example, be comprise a region proximal to a door 5-1 or a tailgate of the vehicle 3.

The controller 21 in the present embodiments selects one of a plurality of polling modes PM-1, PM-2, PM-3. In a variant, the controller 21 may be configured dynamically to generate two or more polling modes PM-n which are different from each other. For example, the controller 21 may implement different polling modes PM-n by dynamically adjust the polling rate, for example by adjusting the time interval between the transmission of polling signals. The time intervals may be continuously variable, for example to enable progressive transitions between different polling modes PM-n. An embodiment of the control system 1 having a controller 21 configured to generate different polling signals PS-n will now be described. Like reference numerals are used for like components. The description herein focuses on the differences between the operation of the controller 21 in the present embodiment and the previous embodiment.

The controller 21 is configured to select one of: a first polling mode PM-1 comprising a first polling signal PS-1; and a second polling mode PM-2 comprising a second polling signal PS-2. The first polling signal PS-1 is generated to enable the controller 21 to identify one or more device 2-n authorised to operate one or more systems on the vehicle 3, such as one or more of the latch mechanism 9-n and/or one or more of the handle deployment mechanism 15-n. Alternatively, or in addition, the vehicle systems may include the ignition or start-up of the vehicle 3. The first polling signal PS-1 is broadcast to acquire one or more authorised device 2-n. The controller 21 receives location information from the devices 2-n. As described herein, the second polling signal PS-2 is adapted to request a response only from the one or more acquired device 2-n. The second polling signal PS-2 may be targeted exclusively at the one or more device 2-n acquired when the first polling mode PM-1 was active. Alternatively, or in addition, the second polling signal PS-2 may comprise a device sleep request to instruct any other devices 2-n (i.e. any devices 2-n not acquired when the first polling mode PM-1 was active) to remain in a sleep mode and/or not to respond. In a variant, the controller 21 may be configured to determine the location of the one or more acquired device 2-n.

The operation of the controller 21 will be described with reference to first and second devices 2-1 , 2-2 which are both within a communication range of the vehicle transceiver 29. The first device 2-1 is an authorised device. In the present embodiment, the second device 2-2 is an un-authorised (excluded) device. It will be understood that the controller 21 can operate with more than two devices 2-n.

The controller 21 defaults to selecting the second polling mode PM-2 comprising the second polling signal PS-2. The second polling signal PS-2 is transmitted wirelessly by the vehicle transceiver 29 and is received by the first device 2-1 and the second device 2-2. In response to the first polling signal PS-1 , the first and second devices 2-1, 2-2 each transmit an identification signal comprising a unique identification code. The controller 21 processes the unique identification codes and determines that the first device 2-1 is an authorised device having appropriate permissions to control the vehicle systems. The first device 2-1 is thereby acquired by the controller 21. The controller 21 determines that the second device 2-2 is not an authorised device and does not have in place the requisite permissions to operate the vehicle systems. This could be due to the determined location of the key or the battery status, for example.

The second polling signal PS-2 is transmitted to maintain communication after acquisition of the first device 2-1. The first device 2-1 responds to the second polling signal PS-2 to enable the location of the first device 2-1 to be determined, for example using signal strength or time-of-flight for the signals. The controller 21 remains in the second polling mode SM-2 to track the location of the first device 2-1. The vehicle systems may be controlled in dependence on the position of the first device 2-1 in relation to the vehicle 3. If the tracking of the first device 2-1 is lost or interrupted, the controller 21 selects the third polling mode PM-3 to re-establish communication. The controller 21 reverts to the second polling mode PM-2 if the first device 2-1 is re-acquired or if the first device 2-1 is not re-acquired within a predetermined time period (i.e. there is a system timeout). The second device 2-2 may remain within the communication range of the vehicle transceiver 29 for a period of time. Since the second device 2-2 is not authorised by the control system 1, the continued communication with the vehicle 3 would unnecessarily deplete the power stored in the on-board battery. At least partially to address this problem, the second polling signal PS-1 comprises a device sleep request which instructs the second device 2-2 (or any non-authorised device(s) paired to the vehicle 3) not to respond to the second polling signal PS-2. The first device 2-1 continues to respond to the second polling signal PS-2. The second device 2-2 receives the device sleep request and remains in the sleep mode. As such, the second device 2-2 does not transmit a response. At least in certain embodiments, this functionality enables the second device 2-2 to conserve power. The second polling signal PS-2 may, for example, comprise an authorized device identifier for differentiating between the first device 2-1 and the second device 2-2. The second device 2-2 may remain in the sleep mode if the authorized device identifier is not recognised. The authorized device identifier may be defined during the initial communication, for example following classification of the first device 2-1 as an authorised device. The authorized device identifier could be predefined or could be generated dynamically.

The controller 21 may communicate with more than two of the devices 2-n. The controller 21 is configured periodically to change from the second polling mode PM-2 to the first polling mode PM-1 in order to identify any additional devices 2 (i.e. in addition to the first and second devices 2-1, 2-2). For example, a third device 2-3 may enter the communication range of the vehicle transceiver 29. The third device 2-3 in this example is an authorised device for controlling the vehicle systems. The controller 21 selects the first polling mode PM-1 and transmits the first polling signal PS-1 to initiate communication with the third device 2-3. Alternatively, the controller 21 may select a third polling mode PM-3 to transmit a third polling signal PS-3 to initiate communication with the third device 2-3. With reference to the unique identification code transmitted by the third device 2-3, the controller 21 can determine that the third device 2-3 is also an unauthorised device. The controller 21 then re-selects the second polling mode PM-2. The second polling mode PM-2 is implemented to maintain communication with the first device 2-1 and the third device 2-3. The second polling signal PS-2 may, for example, comprise an authorized device identifier for identifying the first and third devices 2-1, 2-3. The second device 2-2 does not respond to second polling signal PS-2.

In a variant of the control system 1, the controller 21 may be configured to make a further distinction between devices 2-n which have previously been classified as being authorized in dependence on their location relative to the vehicle 3. For example, the control system 1 may be configured to reduce or inhibit communication with devices 2-n which are disposed within the vehicle 3 or are beyond a predetermined range of the vehicle 3. Alternatively, or in addition, the control system 1 may be configured to reduce or inhibit communication with a device 2-n identified as being located externally of the vehicle 3, for example if the device 2-n remains in at least substantially the same location for an extended time period (for example, longer than a predetermined time period). The controller 21 may transmit a polling signal PS-n comprising a device sleep request to one or more authorized devices in dependence on their determined location. The controller 21 may periodically omit the device sleep request in order to confirm that the location of the device 2-n has not changed.

Alternatively, or in addition, the controller 21 may be configured to transmit a device wake-up request to one or more device 2-n. The controller 21 may generate the device wake-up request when the determined distance to the device 2-n is within a predetermined range. It will be understood that the second polling signal PS-2 may be configured to target only those devices 2-n which have been identified as authorized devices. Alternatively, the second polling signal PS-2 may be configured to instruct devices 2-n which are not authorized (i.e. excluded devices) not to respond to the second polling signal PS-2.

The handles 11-n have been described herein as operating an associated latch mechanism 9-n to open and close the closure member 7-1. The latch mechanism 9-n engages the door latch pin when the closure member 7-n is closed. The closure members 7-1 can be selectively locked and unlocked, for example by operating a lock mechanism (not shown). The lock mechanism may be configured selectively to lock the latch mechanisms 9-n to inhibit opening of the associated closure members 7-n. Alternatively, the or each lock mechanism may be configured selectively to connect each handle 11-n to the associated latch mechanism 9-n. The lock mechanism is “locked’ by disconnecting the handle 11-n from the latch mechanism 9-n, such that operating the handle 11-n does not disengage the latch mechanism 9-n and the closure member 7-n cannot be opened. The lock mechanism is “unlocked” by connecting the handle 11-n to the associated latch mechanism 9-n, thereby enabling the handle 11-n to be operated to disengage the latch mechanism 9-n and the closure member 7-n to be opened. The lock mechanism is operative selectively to connect the handle 11-n on an exterior of the closure member 7-n and any corresponding handle on an interior of the closure member 7-n. In a further variant, the latch mechanism 9-n may be electrically actuated. The latch mechanism 9-n may, for example, comprise an electromagnet or an electromechanical actuator for selectively actuating the latch mechanism 9-n. The latch mechanism 9-n may be disengaged in dependence on an open request signal generated in dependence on actuation of the handle 11-n. The operation of the latch mechanism 9-n is controlled in dependence on a lock signal or an unlock signal. This arrangement may be implemented in door closure member or a tailgate. For example, a tailgate latch mechanism may be controlled in dependence on a release request signal output when a tailgate control switch is operated. The release request signal may be processed or ignored based on a current locking state of the tailgate. In these electronically controlled mechanisms, the lock mechanism is incorporated into the latch mechanism 9-n and the associated latch controller.

It will be appreciated that various changes and modifications can be made to the present invention without departing from the scope of the present application.

Claims

1. A control system comprising one or more controller for communicating with a device, the control system being configured to: broadcast at least a first polling signal to initiate a communication with the device; receive a response signal from the device; and identify the device in dependence on the response signal; wherein the control system implements a first polling mode to initiate the communication with the device; and implements a second polling mode after identification of the device.

2. A control system as claimed in claim 1 , wherein the one or more controller comprises: at least one electronic processor having an electrical output for outputting at least the first polling signal; and at least one input for receiving the response signal from the device; and at least one memory device electrically coupled to the at least one electronic processor and having instructions stored therein, and wherein the at least one electronic processor is configured to select one of the first polling mode and the second polling mode.

3. A control system as claimed in claim 1 or claim 2, wherein the first polling mode comprises a first polling rate for transmitting the first polling signal; and the second polling mode comprises a second polling rate for transmitting the first polling signal; the first and second polling rates being different from each other; and optionally wherein the first polling rate is greater than the second polling rate.

4. A control system as claimed in any one of the preceding claims, wherein the second polling mode comprises generating a device sleep request for transmission to the device to attenuate generation of the response signal.

5. A control system as claimed in claim 4, wherein the processor is configured to identify a plurality of devices; and the device sleep request is targeted at a particular one of the devices; and optionally wherein the device sleep request comprises a device identifier associated with the particular one of the devices.

6. A control system as claimed in any one of claims 4, or 5, wherein a second polling signal comprises the device sleep request.

7. A control system as claimed in any one of claims 4 to 6, wherein the second polling mode comprises transmitting the device sleep request; and optionally wherein the second polling mode comprises periodically transmitting the first polling signal.

8. A control system as claimed in any one of claims 4 to 7, wherein the control system is configured to generate a device wake-up request for transmission to the device to amplify generation of the response signal.

9. A control system as claimed in any one of the preceding claims, wherein the device comprises an electronic key for accessing a vehicle.

10. A vehicle comprising the control system according to any one of the preceding claims.

11. A method of communicating with a device, the method comprising: broadcasting at least a first polling signal to initiate a communication with the device; receiving a response from the device; and identifying the device in dependence on the response; wherein the method comprises implementing a first polling mode to initiate the communication with the device; and implementing a second polling mode after identification of the device.

12. A method as claimed in claim 11, wherein the first polling mode comprises a first polling rate for transmitting the first polling signal; and the second polling mode comprises a second polling rate for transmitting the first polling signal; the first and second polling rates being different from each other; and optionally wherein the first polling rate is greater than the second polling rate.

13. A method as claimed in any one of claims 11 and 12, wherein the second polling mode comprises generating a device sleep request for transmission to the device to attenuate generation of the response signal.

14. A method as claimed in claim 13 comprising identifying a plurality of devices; and the device sleep request is targeted at a particular one of the devices; and optionally wherein the device sleep request comprises a device identifier associated with the particular one of the devices.

15. A non-transitory computer-readable medium having a set of instructions stored therein which, when executed, cause a processor to perform the method claimed in any one of claims 11 to 14.