GB2559170A

GB2559170A - Apparatus and method for controlling movement of a vehicle

Info

Publication number: GB2559170A
Application number: GB1701444.0A
Authority: GB
Inventors: Craig Woodley Jonathan; Ciovnicu Roxana
Original assignee: Jaguar Land Rover Ltd
Current assignee: Jaguar Land Rover Ltd
Priority date: 2017-01-30
Filing date: 2017-01-30
Publication date: 2018-08-01
Anticipated expiration: 2037-01-30
Also published as: GB201701444D0; GB2559170B

Abstract

The movement of a vehicle 100 is controlled by a vehicle control unit (VCU) 10. The VCU receives transmitted signals from remote control device 200 via receiving means 202. The remote control device 200 is used to request a motion of the vehicle. The VCU 10 then provides an output signal for controlling the motion of the vehicle based on the requested motion from the remote control device 200. The vehicle 100 has one or more proximity sensors comprising ultrasound, radar or optical sensors used to detect attachment of a trailer 300. The trailer can also be detected by an electrical connection with the vehicle. When a trailer 300 is detected, the output signal from the VCU 10 is limited. The output signal can correspond to a maximum speed of the vehicle. The maximum speed can be zero which results in no movement of the vehicle when the trailer 300 is connected.

Description

(71) Applicant(s):

Jaguar Land Rover Limited (Incorporated in the United Kingdom)

Abbey Road, Whitley, Coventry, Warwickshire, CV3 4LF, United Kingdom (56) Documents Cited:

JP 2005001548 A US 20170008563 A1 US 20070032913 A1

US 20170072955 A1 US 20130138288 A1 (58) Field of Search:

INT CL B60K, B62D, G05D Other: EPODOC, WPI, TXTA (72) Inventor(s):

Jonathan Craig Woodley Roxana Ciovnicu (74) Agent and/or Address for Service:

Jaguar Land Rover

Patents Department W/1/073, Abbey Road, Whitley, COVENTRY, CV3 4LF, United Kingdom (54) Title of the Invention: Apparatus and method for controlling movement of a vehicle

Abstract Title: Controlling the movement of a vehicle via a remote device and limiting vehicle speed when a trailer is connected (57) The movement of a vehicle 100 is controlled by a vehicle control unit (VCU) 10. The VCU receives transmitted signals from remote control device 200 via receiving means 202. The remote control device 200 is used to request a motion of the vehicle. The VCU 10 then provides an output signal for controlling the motion of the vehicle based on the requested motion from the remote control device 200. The vehicle 100 has one or more proximity sensors comprising ultrasound, radar or optical sensors used to detect attachment of a trailer 300. The trailer can also be detected by an electrical connection with the vehicle. When a trailer 300 is detected, the output signal from the VCU 10 is limited. The output signal can correspond to a maximum speed of the vehicle. The maximum speed can be zero which results in no movement of the vehicle when the trailer 300 is connected.

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APPARATUS AND METHOD FOR CONTROLLING MOVEMENT OF A VEHICLE

TECHNICAL FIELD

The present disclosure relates to controlling movement of a vehicle. In particular, but not exclusively, it relates to controlling movement of a road vehicle such as a car in a remote control mode of operation.

Aspects of the invention relate to an apparatus for controlling movement of a vehicle, a system for controlling movement of a vehicle, a vehicle, a method of controlling movement of a vehicle, and a computer program.

BACKGROUND

Suitably equipped vehicles can be operated in a remote control drive mode via a remote device, such as a smart phone having a suitable remote control drive program, to provide convenient means for an operator of the vehicle to control movement the vehicle from a position outside of the vehicle. This may, for example, be to allow the operator to get a more immediate and encompassing view of the terrain, to allow the operator to carry out a task outside the vehicle, such as opening and subsequently closing a gate across the vehicle’s path and manoeuvring the vehicle through the gate, or to park the vehicle - particularly in a restricted space.

One problem with such an arrangement is how to maximize the safety of the vehicle and people within the vicinity of the vehicle, including the vehicle operator, while the vehicle is being remotely controlled.

It is an aim of the present invention to address this problem.

SUMMARY OF THE INVENTION

Aspects of the invention relate to an apparatus for controlling movement of a vehicle, a system for controlling movement of a vehicle, a vehicle, a method of controlling movement of a vehicle, and a computer program, as claimed in the appended claims.

According to an aspect of the invention, there is provided an apparatus for controlling movement of a vehicle, the apparatus comprising processing means configured to: receive first signals from a receiving means in dependence on received transmitted signals from a remote control device indicating a requested motion of a vehicle; receive one or more second signals indicative of a trailer being connected to the vehicle; and provide an output signal for controlling movement of the vehicle based on the requested motion, wherein the output signal is limited dependent on the one or more second signals.

When a trailer is attached to a vehicle, it may obscure certain of the vehicle’s sensors - such as one or more of the parking sensors, radars, or cameras. Signals from those sensors may be useful in maintaining full control of the vehicle during a remote control mode of operation - for example as proximity sensors to prevent collisions with obstacles in the vicinity of the vehicle; signals from those proximity sensors being taken as inputs to a collision prevention system that will automatically bring the vehicle to a controlled stop if an obstacle is detected as being too close to the path of the vehicle. This is particularly significant in the case of reverse movements. Hence, if at least some of those sensors are not capable of operating at their full capabilities then the collision prevention system may not be relied upon to avoid such collisions. Moreover, a connected trailer would typically result in increased stopping distances for the vehicle. Thus, with a trailer attached, there is an increased chance of colliding with an obstacle when operating the vehicle in a remote control mode. Accordingly, by detecting the presence of a trailer connected to the vehicle, the remote control mode of operation may be limited (e.g. restricted) so as to reduce the risk of collision.

The output signal may be inhibited in dependence on the one or more second signals. Thus, in certain embodiments, operation in the remote control mode is fully prevented and the vehicle may only be moved by driving it in manual mode.

The output signal may be for limiting the speed of the vehicle to a maximum speed value. By limiting the maximum speed of the vehicle whilst in remote control mode with a trailer connected, the vehicle will have a reduced required braking distance, and will allow the operator a greater time to react to any potential collisions. Another way to limit the remote control mode of operation would be to prevent movements in reverse, since that is the direction in which the trailer may be obscuring the field of view of the relevant sensors.

The maximum speed value may be zero. This corresponds, in effect, to the limitation being a full prevention of operation in the remote control mode. The output signal may be for applying a braking force to the vehicle. Thus, if a trailer is detected as being connected, the vehicle brakes may be applied either to prevent move-off of the vehicle, or to bring the vehicle to a controlled stop if the presence of the trailer is only detected after the vehicle has begun to be moved under remote control operation.

In some embodiments, receiving the one or more second signals comprises receiving a trailer connection signal from a trailer connection sensor. Receiving the trailer connection signal may comprise receiving a signal on the vehicle CAN bus indicative of an electrical connection between the trailer and the vehicle.

The trailer connection sensor may comprise one or more proximity sensors and receiving the trailer connection signal may comprise receiving a signal output in dependence on the one or more proximity sensors detecting the presence of an object at a set distance from the vehicle. For a given trailer and connection mechanism, the distance from the rear of the vehicle (the proximity sensor(s) at the rear of the vehicle) to the front of the trailer will be known. As such, if the proximity sensors detect an object at that known distance then it can be inferred that the given trailer is connected to the vehicle. The one or more proximity sensors may be selected from the group comprising: ultrasound sensors, radar sensors and optical sensors. It will be understood that any sensor or group of sensors that can be used to detect whether an object is at a particular distance from the vehicle may be employed. The set distance may be constant during movement of the vehicle. With a known trailer and a known connection mechanism, the connection of the trailer can be inferred when the vehicle is stationary. However, there is a risk of a false positive, in that there may just be another object such as an unconnected trailer or a wall, at that location. It would be inconvenient if an operator could not use the remote control mode to move the vehicle away from that obstacle simply because it was at a distance where it could have been taken to be a connected trailer. Thus, to avoid such false positives, in certain embodiments that movement is allowed under remote control operation - possibly in a limited capacity, such as away from the obstacle only, and/or at a slow speed - yet the signals from the proximity sensors continue to be monitored during that initial movement and if the distance to the object remains substantially constant, then it can be inferred that it is in fact connected to the vehicle (i.e. a trailer). Once it is determined that a trailer is connected, then operation in the remote control mode will typically be ended by bringing the vehicle to a controlled stop (i.e. by application of the vehicle brakes) and preventing any further remote control of the vehicle until the trailer has been disconnected. With this means of detecting the presence of an object connected to the rear of the vehicle, the remote control mode can be limited or inhibited even when the object is not a trailer per se; by way of example, another vehicle connected via a tow-rope.

The processing means may comprise an electronic processor electrically coupled to an electronic memory device having instructions stored therein, the electronic processor having an electrical input for receiving the first signals and the second signals.

According to another aspect of the invention, there is provided a system for controlling the movement of a vehicle comprising the apparatus described above, and a receiving means for receiving the transmitted signals from a remote control device via a wireless local area network.

According to a further aspect of the invention, there is provided a vehicle comprising an apparatus or a system as described above.

According to another aspect of the invention, there is provided a method of controlling movement of a vehicle, the method comprising: receiving first signals from a receiving means in dependence on received transmitted signals from a remote control device indicating a requested motion of a vehicle; receiving one or more second signals indicative of a trailer being connected to the vehicle; and providing an output signal for controlling movement of the vehicle based on the requested motion, wherein the output signal is limited dependent on the one or more second signals.

Providing an output signal may comprise providing an output signal to at least one of: a powertrain controller, a transmission controller, a brake controller, and a steering controller to cause the vehicle to move in accordance with the requested motion. The output signal may be for limiting the speed of the vehicle to a maximum speed value. The maximum speed value may be zero.

According to yet another aspect of the invention, there is provided a computer program that, when run on a processor, performs a method as described above.

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

Embodiments of the invention will now be described by way of example only, with reference to the accompanying figures, in which:

Figure 1 shows a schematic view of a vehicle suitable for use with a remote control drive system according to the invention;

Figure 2 shows a vehicle and connected trailer and an associated remote control device for use in controlling movement of the vehicle;

Figure 3 shows a block diagram of a controller for controlling movement of a vehicle;

Figure 4 shows a schematic view of main input devices within the vehicle;

Figure 5 shows a flowchart of a method of controlling the movement of a vehicle in a remote control mode according to one embodiment; and

Figure 6 shows a schematic view of a system and an apparatus for controlling movement of a vehicle according to the invention.

DETAILED DESCRIPTION

The figures illustrate an apparatus 101 for controlling movement of a vehicle 100, the apparatus comprising processing means 10 configured to: receive first signals from a receiving means 202 in dependence on received transmitted signals from a remote control device 200 indicating a requested motion of a vehicle 100; receive one or more second signals indicative of a trailer 300 being connected to the vehicle 100; and provide an output signal for controlling movement of the vehicle 100 based on the requested motion. The output signal is limited dependent on the one or more second signals.

The figures also illustrate a method of controlling movement of a vehicle 100, the method comprising: receiving first signals from a receiving means 202 in dependence on received transmitted signals from a remote control device 200 indicating a requested motion of a vehicle 100; receiving one or more second signals indicative of a trailer 300 being connected to the vehicle 100; and providing an output signal for controlling movement of the vehicle 100 based on the requested motion. The output signal is limited dependent on the one or more second signals.

As used herein, a trailer is defined as any component that may be connected at a rear end of a vehicle, to be towed by or otherwise moved with the vehicle. A trailer would typically be a wheeled component, but may in certain embodiments have other ground-engaging means, such as tracks or skis, or may not engage the ground at all - such as a rack for attachment to the rear of the vehicle (e.g. a bicycle rack). At its simplest, a trailer may be connected to the vehicle by a rope or similar connection. Other trailers would be connected by dedicated mechanical connection members, such as for attachment to a tow-bar on the vehicle, as is well known in the art. In addition, the trailer may have electrical components, such as lights, that may be connected electronically to the vehicle to be powered and controlled via the vehicle’s electrical system.

FIG. 1 shows a vehicle 100 according to an embodiment of the present invention. The vehicle 100 has a powertrain 129 that includes an engine 121 that is connected to a driveline 130 having an automatic transmission 124. It is to be understood that embodiments of the present invention are also suitable for use in vehicles with manual transmissions, continuously variable transmissions or any other suitable transmission. Moreover, embodiments of the invention are suitable for use in vehicles having other types of powertrain, such as battery electric vehicles, fuel cell powered vehicles, and hybrids.

In the embodiment of FIG. 1 the transmission 124 may be set to one of a plurality of transmission operating modes, being a park mode P, a reverse mode R, a neutral mode N, a drive mode D or a sport mode S, by means of a transmission mode selector dial 124S. The selector dial 124S provides an output signal to a powertrain controller 11 in response to which the powertrain controller 11 causes the transmission 124 to operate in accordance with the selected transmission mode. Accordingly, in this embodiment a transmission controller (not shown) is incorporated into the powertrain controller 11. However, in other embodiments the transmission controller may be a separate element in operable communication with the controller 10.

The driveline 130 is arranged to drive a pair of front vehicle wheels 111,112 by means of a front differential 137 and a pair of front drive shafts 118. The driveline 130 also comprises an auxiliary driveline portion 131 arranged to drive a pair of rear wheels 114, 115 by means of an auxiliary driveshaft or prop-shaft 132, a rear differential 135 and a pair of rear driveshafts 139. The front wheels 111, 112 in combination with the front drive shafts 118 and front differential 137 may be referred to as a front axle 136F. The rear wheels 114, 115 in combination with rear drive shafts 139 and rear differential 135 may be referred to as a rear axle 136R.

The wheels 111, 112, 114, 115 each have a respective brake 111B, 112B, 114B, 115B. Respective speed sensors 111S, 112S, 114S, 115S are associated with each wheel 111, 112, 114, 115 of the vehicle 100. The sensors 111S, 112S, 114S, 115S are mounted to the vehicle 100 and arranged to measure a speed of the corresponding wheel.

Embodiments of the invention are suitable for use with vehicles in which the transmission is arranged to drive only a pair of front wheels or only a pair of rear wheels (i.e. front wheel drive vehicles or rear wheel drive vehicles) or selectable two-wheel drive/four-wheel drive vehicles. In the embodiment of FIG. 1 the transmission 124 is releasably connectable to the auxiliary driveline portion 131 by means of a power transfer unit (PTU) 131P, allowing operation in a two-wheel drive mode or a four-wheel drive mode. It is to be understood that embodiments of the invention may be suitable for vehicles having more than four wheels or where only two wheels are driven, for example two wheels of a three-wheeled vehicle or four-wheeled vehicle or a vehicle with more than four wheels.

A control system for the vehicle 100 includes a central controller 10, referred to as a vehicle control unit (VCU) 10, the powertrain controller 11, a brake controller 13 and a steering controller 170C. The brake controller 13 is an anti-lock braking system (ABS) controller 13 and forms part of a braking system 22 (FIG. 3). The VCU 10 receives and outputs a plurality of signals to and from various sensors 1000 and subsystems (not shown) provided on the vehicle. The VCU 10 includes a low-speed progress (LSP) control system 12 shown in FIG. 3, a stability control system (SCS) 14S, a traction control system (TCS) 14T, a cruise control system 16 and a Hill Descent Control (HDC) system 12HD. The SCS 14S improves stability of the vehicle 100 by detecting and managing loss of traction when cornering. When a reduction in steering control is detected, the SCS 14S is configured automatically to command the brake controller 13 to apply one or more brakes 111B, 112B, 114B, 115B of the vehicle 100 to help to steer the vehicle 100 in the direction the user wishes to travel. If excessive wheel spin is detected, the TCS 14S is configured to reduce wheel spin by application of brake force in combination with a reduction in powertrain drive torque. In the embodiment shown the SCS 14S and TCS 14T are implemented by the VCU 10. In some alternative embodiments the SCS 14S and/or TCS 14T may be implemented by the brake controller 13. Further alternatively, the SCS 14S and/or TCS 14T may be implemented by one or more further controllers. The brakes 111B, 112B, 114B, 115B together comprise a service brake 50 that is operably connected to the brake controller 13, as shown in Fig. 6. Also operably connected to the brake controller is an electronic parking brake (EPB) 52, which is engaged when the park mode P is selected to apply a braking force to the wheels.

One or more of the controllers 10, 11, 13, 170C may be implemented in software run on a respective one or more computing devices such as one or more electronic control units (ECUs). In some embodiments two or more of the controllers 10, 11, 13, 170C may be implemented in software run on one or more common computing devices. Two or more controllers 10, 11, 13, 170C may be implemented in software in the form of a combined software module.

It is to be understood that one or more computing devices may be configured to permit a plurality of software modules to be run on the same computing device without interference between the modules. For example the computing devices may be configured to allow the modules to run such that if execution of software code embodying a first controller terminates erroneously, or the computing device enters an unintended endless loop in respect of one of the modules, it does not affect execution of software code comprised by a software module embodying a second controller.

It is to be understood that one or more of the controllers 10, 11, 13, 170C may be configured to have substantially no single point failure modes, i.e. one or more of the controllers may have dual or multiple redundancy. It is to be understood that robust partitioning technologies are known for enabling redundancy to be introduced, such as technologies enabling isolation of software modules being executed on a common computing device. It is to be understood that the common computing device will typically comprise at least one microprocessor, optionally a plurality of processors, which may operate in parallel with one another. In some embodiments a monitor may be provided, the monitor being optionally implemented in software code and configured to raise an alert in the event a software module is determined to have malfunctioned.

The SCS 14S, TCS 14T, ABS controller 22C and HDC system 12HD provide outputs indicative of, for example, SCS activity, TCS activity and ABS activity including brake interventions on individual wheels and engine torque requests from the VCU 10 to the engine 121, for example in the event a wheel slip event occurs. Each of the aforementioned events indicate that a wheel slip event has occurred. Other vehicle sub-systems such as a roll stability control system or the like may also be present.

As noted above, the vehicle 100 includes a cruise control system 16 which is operable to automatically maintain vehicle speed at a selected speed when the vehicle is travelling at speeds in excess of 25 kph. The cruise control system 16 is provided with a cruise control HMI (human machine interface) 18 by which means the user can input a target vehicle speed to the cruise control system 16 in a known manner. Cruise control system input controls are mounted to a steering wheel 171 (FIG. 4). The cruise control system 16 may be switched on by pressing a cruise control system selector button 176. When the cruise control system 16 is switched on, depression of a ‘set-speed’ control 173 sets the current value of a cruise control set-speed parameter, cruise_set-speed to the current vehicle speed. Depression of a cruise control increase set speed button, in the form of a “+’ button 174 allows the value of cruise_set-speed to be increased whilst depression of a button 175 allows the value of cruise_set-speed to be decreased. A resume button 173R is provided that is operable to control the cruise control system 16 to resume speed control at the instant value of cruise_set-speed following a driver over-ride intervention. It is to be understood that known on-highway cruise control systems including the present system 16 are configured so that, in the event that the user depresses the brake or, in the case of vehicles with a manual transmission, a clutch pedal, the cruise control function is cancelled and the vehicle 100 reverts to a manual mode of operation which requires accelerator pedal input by a user in order to maintain vehicle speed. In addition, detection of a wheel slip event, as may be initiated by a loss of traction, also has the effect of cancelling the cruise control function. Speed control by the system 16 is resumed if the driver subsequently depresses the resume button 173R.

The LSP control system 12 also provides a speed-based control system for the user, which enables the user to select a very low target speed at which the vehicle can progress without any pedal inputs being required by the user. Low-speed speed control (or progress control) functionality is not provided by the on-highway cruise control system 16 which operates only at speeds above 25 kph.

The LSP control system 12 is activated by means of a LSP control system selector button 172 mounted on the steering wheel 171. The system 12 is operable to apply selective powertrain, traction control and braking actions to one or more wheels of the vehicle 100, collectively or individually, to maintain the vehicle 100 at the desired speed. It is to be understood that in some embodiments the LSP control system selector button 172 may be mounted in a location other than on the steering wheel 171, such as in a dashboard or any other suitable location.

The LSP control system 12 is configured to allow a user to input a desired value of setspeed parameter, user_set-speed to the LSP control system 12 via a low-speed progress control HMI (LSP HMI) 20 (FIG. 1, FIG. 3) which shares certain input buttons 173-175 with the cruise control system 16 and HDC control system 12HD. Provided the vehicle speed is within the allowable range of operation of the LSP control system (which is the range from 2 to 30kph in the present embodiment although other ranges are also useful) the LSP control system 12 controls vehicle speed in accordance with the value of user_set-speed by setting a parameter LSP_set-speed equal to the value of user_set-speed unless the system 12 determines that a lower value of LSP_set-speed is required as discussed in more detail below with respect to FIG. 5. Unlike the cruise control system 16, the LSP control system 12 is configured to operate independently of the occurrence of a traction event. That is, the LSP control system 12 does not cancel speed control upon detection of wheel slip. Rather, the LSP control system 12 actively manages vehicle behaviour when slip is detected.

The LSP control HMI 20 is provided in the vehicle cabin so as to be readily accessible to the user. The user of the vehicle 100 is able to input to the LSP control system 12, via the LSP HMI 20, an indication of the speed at which the user desires the vehicle to travel, user_setspeed, by means of the ‘set-speed’ button 173 and the “+’/ buttons 174, 175 in a similar manner to the cruise control system 16. The LSP HMI 20 also includes a visual display upon which information and guidance can be provided to the user about the status of the LSP control system 12.

The LSP control system 12 receives an input from the braking system 22 of the vehicle indicative of the extent to which the user has applied braking by means of the brake pedal 163. The LSP control system 12 also receives an input from an accelerator pedal 161 indicative of the extent to which the user has depressed the accelerator pedal 161. An input is also provided to the LSP control system 12 from the transmission or gearbox 124. This input may include signals representative of, for example, the speed of an output shaft of the gearbox 124, torque converter slip and a gear ratio request. Other inputs to the LSP control system 12 include an input from the cruise control HMI 18 which is representative of the status (ON/OFF) of the cruise control system 16, and an input from the LSP control HMI 20.

The HDC system 12HD is configured to limit vehicle speed when descending a gradient. When the HDC system 12HD is active, the system 12HD controls the braking system 22 (via brake controller 13) in order to limit vehicle speed to a value corresponding to that of a HDC set-speed parameter HDC_set-speed which may be set by a user. The HDC set-speed may also be referred to as an HDC target speed. Provided the user does not override the HDC system by depressing the accelerator pedal when the HDC system 12HD is active, the HDC system 12HD controls the braking system 22 to prevent vehicle speed from exceeding the value of HDC_set-speed. In the present embodiment the HDC system 12HD is not operable to apply positive drive torque. Rather, the HDC system 12HD is only operable to apply negative brake torque by means of the braking system 22.

A HDC system HMI 20HD is provided by means of which a user may control the HDC system 12HD, including setting the value of HDC_set-speed. An HDC system selector button 177 is provided on the steering wheel 171 by means of which a user may activate the HDC system 12HD to control vehicle speed.

As noted above, the HDC system 12HD is operable to allow a user to set a value of HDC set-speed parameter HDC_set-speed and to adjust the value of HDC_set-speed using the same controls as the cruise control system 16 and LSP control system 12. Thus, in the present embodiment, when the HDC system 12HD is controlling vehicle speed, the HDC system set-speed may be increased, decreased or set to an instant speed of the vehicle in a similar manner to the set-speed of the cruise control system 16 and LSP control system 12, using the same control buttons 173, 173R, 174, 175. The HDC system 12HD is operable to allow the value of HDC_set-speed to be set to any value in the range from 2-30kph.

It is to be understood that the VCU 10 is configured to implement a Terrain Response (TR) (RTM) System of the kind described above in which the VCU 10 controls settings of one or more vehicle systems or sub-systems such as the powertrain controller 11 in dependence on a selected driving mode. The driving mode may be selected by a user by means of a driving mode selector 141S (FIG. 1). The driving modes may also be referred to as terrain modes, terrain response modes, or control modes. In the embodiment of FIG. 1 four driving modes are provided: an ‘on-highway’ driving mode or ‘special programs off’ (SPO) mode suitable for driving on a relatively hard, smooth driving surface where a relatively high surface coefficient of friction exists between the driving surface and wheels of the vehicle; a ‘sand’ driving mode (SAND) suitable for driving over sandy terrain; a ‘grass, gravel or snow’ (GGS) driving mode suitable for driving over grass, gravel or snow, a ‘rock crawl’ (RC) driving mode suitable for driving slowly over a rocky surface; and a ‘mud and ruts’ (MR) driving mode suitable for driving in muddy, rutted terrain. Other driving modes may be provided in addition or instead.

The sensors on the vehicle 100 include sensors which provide continuous sensor outputs to the VCU 10, including wheel speed sensors 111S, 112S, 114S, 115S, as mentioned previously and as shown in FIG. 1, and other sensors (not shown) such as an ambient temperature sensor, an atmospheric pressure sensor, tyre pressure sensors, wheel articulation sensors, gyroscopic sensors to detect vehicular yaw, roll and pitch angle and rate, a vehicle speed sensor, a longitudinal acceleration sensor, an engine torque sensor (or engine torque estimator), a steering angle sensor, a steering wheel speed sensor, a gradient sensor (or gradient estimator), a lateral acceleration sensor which may be part of the SCS 14S, a brake pedal position sensor, a brake pressure sensor, an accelerator pedal position sensor, longitudinal, lateral and vertical motion sensors, an inertial measurement unit (IMU), and water detection sensors forming part of a vehicle wading assistance system (not shown). In other embodiments, only a selection of the aforementioned sensors may be used. Other sensors may be useful in addition or instead in some embodiments. The collection of vehicle sensors is depicted schematically in Figure 6 as vehicle sensors 1000.

The VCU 10 also receives a signal from the steering controller 170C. The steering controller 170C is in the form of an electronic power assisted steering unit (ePAS unit). The steering controller 170C provides a signal to the VCU 10 indicative of the steering force being applied to steerable road wheels 111, 112 of the vehicle 100. This force corresponds to that applied by a user to the steering wheel 171 in combination with steering force generated by the ePAS unit 170C.

As shown in Figures 2 and 6, the controller 10 is configured to receive signals from a receiving means 202 arranged to receive transmitted signals from a remote control device 200 indicating a requested motion of a vehicle.

An example of a system 201 incorporating the apparatus 101 is shown in Fig. 6. The system includes the apparatus of Fig. 3 and a receiving means 202 in the form of a radio unit. The radio unit 202 may comprise a receiver and a transmitter or a transceiver configured to receive radio signals transmitted from a remote control device 200 and transmit signals to the remote control device 200. The radio unit 202 and the remote control device 200 may be arranged to provide a wireless local area network, via which two-way communication may take place between the radio unit 202 and the remote control device 200. For example, the radio unit 202 may be arranged to communicate by WiFi with the remote control device 200. In alternative embodiments other radio communication standards may be used for the communication. In one example, communication between the radio unit 202 and the remote control device 200 is provided via Bluetooth.

The remote control device 200 may be a portable device, which may be carried and used by a person outside of the vehicle 100. In an example, the remote control device 200 comprises a mobile phone (or cell phone) having an application to enable the person to provide manual inputs to request movement of the vehicle 100. For example, the manual inputs may include an indication of required throttle and braking, or a required speed, as well as required direction of travel (steering). The remote control device 200 is arranged to include data, indicative of the received user inputs, within the signals transmitted to the radio unit 202. The radio unit 202 is arranged to extract this data and provide the data to the controller 10.

The system enables a person to control movements of the vehicle 100 by remote control by providing user inputs to the remote control device 200. To enable such remote control, a two-way communication link is firstly established between the remote control device 200 and the radio unit 202. With the link established, the remote control device 200 may then be used to indicate to the controller 10 that a remote control mode enabling remote control movement of the vehicle 100 is requested. The controller 10 may determine whether one or more criteria are met before enabling remote control of the vehicle. For example, the controller 10 may determine whether a smart key (not shown) is present within the vehicle 100 and if it is, then remote control movement may be disabled or the maximum allowed speed of the vehicle may be set at zero.

With the communication link established, a user of the remote control device 200 is then able to provide manual inputs to the remote control device 200 to request and control movement of the vehicle, including an increase or decrease in speed or power, an increase or decrease in braking, gear selection, and direction of travel (steering). The remote control device 200 may generate data including information defining the requested movement, which is then transmitted to the radio unit 202 via the communication link.

The radio unit 202 determines the data defining the movement requested by the remote control device 200 and provides the data to the controller 10. The controller 10 provides output signals to the power steering controller 170C, the brake controller 13 and the powertrain controller 11 (incorporating the transmission controller) in dependence of the received data, and thus the user is able to operate the vehicle 100 remotely.

The output signal provided to the brake controller 13 and the powertrain controller 11 may also be dependent upon the maximum speed value mentioned above. Specifically, whatever the speed of vehicle is requested by the remote control device 200, the controller 10 provides output signals to the brake controller 13 and/or the powertrain controller 11 to adjust the speed of the vehicle 100 to be no more than a speed corresponding to the maximum speed value. That is, the speed of the vehicle is limited to be no more than a speed corresponding to the maximum speed value. For example, where the data from the remote control device 202 relates to a user request for increased engine power and/or decreased braking that could increase the speed to 3 kilometres per hour, and the maximum speed value corresponds to 1 kilometre per hour, the controller 10 provides output signals to the brakes and powertrain to cause a speed of only 1 kilometre per hour.

In some instances, the speed requested by the remote control device 200 may be unchanged over a period of time, but the determined maximum speed value may become smaller than the current speed of the vehicle and as a result the output signals to the powertrain controller 11 and/or brake controller 13 may be adjusted to reduce the speed of the vehicle so that it corresponds to the maximum speed value.

Signals output from certain types of sensors may be received and processed at a submodular level prior to onward transmission to the VCU 10. For example, signals from any or all sensors that may be indicative of the roll angle of the vehicle may be processed at a roll control module (e.g. a dedicated processor within the aforementioned roll stability control system) to determine an instantaneous roll angle and/or a rate of change thereof. Analogously, signals from any or all sensors that may be indicative of the pitch angle of the vehicle may be processed at a pitch control module (which may itself be part of the SCS or the HDC system 12HD for example) to determine an instantaneous pitch angle and/or a rate of change thereof. This is shown illustratively in Figure 6, in which the dashed arrows from the vehicle sensors 1000 to the respective vehicle controllers 11, 13 and 170C depict optional connections for communicating data from the sensors 1000 to the respective controllers for onward communication to the central controller 10.

In some embodiments, the distance of the vehicle 100 to an object may be taken into account in the determination of the maximum speed. The distance between the vehicle and an object may be determined on the basis of signals from a proximity sensing means in the form of one or more proximity sensors (not shown) on the vehicle, such as sensors that are known for use to assist parking of the vehicle. The proximity sensors may comprise ultrasonic proximity sensors but alternatively may be electromagnetic proximity sensors. Such sensors are known to be provided on vehicles to assist a driver when parking. Each of the proximity sensors may be arranged to provide sensor signals to the controller 10 indicative of a distance from the sensor to the object nearest to that sensor. The controller 10 may be configured to process the signals from the sensors by performing sensor fusion (or multi sensor data fusion) to obtain a more accurate indication of the distance from the vehicle 100 to the nearest object to the vehicle. That is, data received from the sensors may be combined so that the resulting indication of distance has less uncertainty than it would have if the data from each sensor were used individually.

The sensing means may also comprise one or more optical sensors, such as cameras located within the vehicle 100 that are configured to provide a signal to the controller 10 indicative of a distance to a nearest object.

By virtue of the fact that such proximity sensors may be used as inputs to a collision detection system during a remote control mode of operation, if there is a risk that one or more of these sensors may be compromised by having its field of view at least partially obscured, then that presents a risk to the vehicle and people in the vicinity. Accordingly, the invention addresses this problem by at least limiting - and preferably totally inhibiting - the functionality of the remote control operation if a trailer is detected as being connected to the vehicle.

There are several ways in which that determination can be made. Typically, a trailer is connected both mechanically and electrically to the vehicle. A mechanical connection may be made through a tow-bar. An electrical connection may be made via connection of an electrical cable between the trailer and a connector on the vehicle, for example to provide electrical signals and power to operate lights on the trailer. The detection of the trailer can thus be made on the basis of a sensor to detect the mechanical connection or a sensor to detect the connection of the electrical cable or a combination thereof. That latter detection of the electrical connection may be via a sensor at the connector or may be in response to a trailer connection signal on the CAN bus.

Another way to make the determination is through the use of one or more proximity sensors to detect the presence of an object at a set distance from the vehicle. For a given trailer and connection mechanism, the distance from the rear of the vehicle (the proximity sensor(s) at the rear of the vehicle) to the front of the trailer will be known. As such, if the proximity sensors detect an object at that known distance then it can be inferred that the given trailer is connected to the vehicle. The level of confidence in the determination can be improved by factoring in movement of the vehicle. Thus, if the gap remains substantially constant while the vehicle is moving, then it can be more reliably inferred that the object is moving with the vehicle and is therefore connected to it.

These may be the very same proximity sensors as would be used as inputs to a collision detection system during a remote control mode of operation. Alternatively, the proximity sensors for detecting the trailer or a sub-set or an overlapping set of proximity sensors, in which case it may be advantageous for the fields of view of the respective sets of proximity sensors to at least partially overlap to be confident that any object obscuring the collisiondetecting proximity sensors is picked up by the trailer-detecting proximity sensors.

In certain embodiments, determination of whether or not a trailer is connected to the vehicle may be made with the benefit of shape recognition software and a comparison between known or expected shapes characteristic of a trailer and the signals output by the trailerdetecting proximity sensors. This may be particularly applicable where the proximity sensors include a camera.

An example of a method for controlling the movement of a vehicle with a remote drive system is shown in Figure 5. A schematic example of a processing means, in the form of a controller, for controlling movement of a vehicle is shown in Figure 3. The controller 10 comprises a processor 10a arranged to perform a method embodying the present invention. A computer program, when executed by the processor 10a, is arranged to perform a method embodying the present invention. The computer program may be stored on a computerreadable medium.

A method 500 of controlling the movement of a vehicle is outlined by the flowchart shown in Fig. 5. At block 501 first signals are received from a receiving means in dependence on the receiving means receiving transmitted signals from a remote control device 200 indicating a requested motion of a vehicle 100. The requested motion of the vehicle includes a requested retardation of the vehicle 100. The first signals may be dependent upon the signal strength of the received transmitted signals.

At block 503, one or more second signals indicative of a trailer being connected to the vehicle are received. As described above, these second signals may be received directly from one or more dedicated connection sensors or from one or more proximity sensors indicative of the connection of a trailer 300 to the vehicle 100. The controller 10, at block 505, provides an output signal for controlling speed of the vehicle 100 based on the requested motion. The output signal is limited dependent on the one or more second signals. So, under normal operating conditions with no trailer present, the second signals will indicate that absence of a connected trailer and the remote control mode will be fully operational (all else being equal). If, however, the second signals indicate that there is (or may be) a trailer 300 connected, then the output signal is at least limited so as to mitigate against a possible increased chance of collision due to the trailer possibly obscuring one or more of the vehicle proximity sensors.

In summary, aspects of the invention provide an apparatus and associated method for ensuring safe operation of a vehicle in a remote control drive mode, limiting the functionality of the remote control if a trailer is connected to the vehicle, e.g. by setting a maximum permissible speed or only permitting forward motion of the vehicle, or totally inhibiting operation in remote control mode. The presence of the trailer may be detected through one or more dedicated sensors, through a signal on the CAN bus, or through inference from proximity sensors. In particular, parking sensors may indicate the presence of an object at a set gap from the vehicle, and this can be indicative of the connection of a trailer, especially if the gap remains substantially constant during movement of the vehicle.

References herein to a block such as a function block are to be understood to include reference to items of vehicle hardware, such as electronic modules, and to software code for performing the function or action specified which may be an output that is provided responsive to one or more inputs. The code may be in the form of a software routine or function called by a main computer program, or may be code forming part of a flow of code not being a separate routine or function. Reference to function block is made for ease of explanation of the manner of operation of embodiments of the present invention.

Any controller or controllers described herein may suitably comprise a control unit or computational device having one or more electronic processors. Thus the system may comprise a single control unit or electronic controller or alternatively different functions of the controller may be embodied in, or hosted in, different control units or controllers. As used herein the term “controller” or “control unit” will be understood to include both a single control unit or controller and a plurality of control units or controllers collectively operating to provide any stated control functionality. To configure a controller, a suitable set of instructions may be provided which, when executed, cause said control unit or computational device to implement the control techniques specified herein. The set of instructions may suitably be embedded in said one or more electronic processors. Alternatively, the set of instructions may be provided as software saved on one or more memory associated with said controller to be executed on said computational device. A first controller may be implemented in software run on one or more processors. One or more other controllers may be implemented in software run on one or more processors, optionally the same one or more processors as the first controller. Other suitable arrangements may also be used.

It will be appreciated that embodiments of the present invention can be realised in the form of hardware, software or a combination of hardware and software. Any such software may be stored in the form of volatile or non-volatile storage such as, for example, a storage device like a ROM, whether erasable or rewritable or not, or in the form of memory such as, for example, RAM, memory chips, device or integrated circuits or on an optically or magnetically readable medium such as, for example, a CD, DVD, magnetic disk or magnetic tape. It will be appreciated that the storage devices and storage media are embodiments of machine-readable storage that are suitable for storing a program or programs that, when executed, implement embodiments of the present invention. Accordingly, embodiments provide a program comprising code for implementing a system or method as claimed in any preceding claim and a machine readable storage storing such a program. Still further, embodiments of the present invention may be conveyed electronically via any medium such as a communication signal carried over a wired or wireless connection and embodiments suitably encompass the same.

All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and/or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and/or steps are mutually exclusive.

Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

The invention is not restricted to the details of any foregoing embodiments. The invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed. The claims should not be construed to cover merely the foregoing embodiments, but also any embodiments which fall within the scope of the claims.

Claims

1. Apparatus for controlling movement of a vehicle, the apparatus comprising processing means configured to:

receive first signals from a receiving means in dependence on received transmitted signals from a remote control device indicating a requested motion of a vehicle;

receive one or more second signals indicative of a trailer being connected to the vehicle; and provide an output signal for controlling movement of the vehicle based on the requested motion, wherein the output signal is limited dependent on the one or more second signals.

2. An apparatus according to claim 1, wherein the output signal is inhibited in dependence on the one or more second signals.

3. An apparatus according to claim 1, wherein the output signal is for limiting the speed of the vehicle to a maximum speed value.

4. An apparatus according to claim 3, wherein the maximum speed value is zero.

5. An apparatus according to claim 4, wherein the output signal is for applying a braking force to the vehicle.

6. An apparatus according to any preceding claim, wherein receiving the one or more second signals comprises receiving a trailer connection signal from a trailer connection sensor.

7. An apparatus according to claim 6, wherein receiving the trailer connection signal comprises receiving a signal on the vehicle CAN bus indicative of an electrical connection between the trailer and the vehicle.

8. An apparatus according to claim 6 or claim 7, wherein the trailer connection sensor comprises one or more proximity sensors and wherein receiving the trailer connection signal comprises receiving a signal output in dependence on the one or more proximity sensors detecting the presence of an object at a set distance from the vehicle.

9. An apparatus according to claim 8, wherein the one or more proximity sensors are selected from the group comprising: ultrasound sensors, radar sensors and optical sensors.

10. An apparatus according to claim 8 or claim 9, wherein the set distance is constant during movement of the vehicle.

11. An apparatus according to any preceding claim, wherein:

the processing means comprises an electronic processor electrically coupled to an electronic memory device having instructions stored therein and the electronic processor has an electrical input for receiving the first signals and the second signals.

12. A system for controlling the movement of a vehicle comprising the apparatus according to any preceding claim, and a receiving means for receiving the transmitted signals from a remote control device via a wireless local area network.

13. A vehicle comprising an apparatus in accordance with any one of claims 1 to 11 or a system in accordance with claim 12.

14. A method of controlling movement of a vehicle, the method comprising:

receiving first signals from a receiving means in dependence on received transmitted signals from a remote control device indicating a requested motion of a vehicle;

receiving one or more second signals indicative of a trailer being connected to the vehicle; and providing an output signal for controlling movement of the vehicle based on the requested motion, wherein the output signal is limited dependent on the one or more second signals.

15. A method according to claim 14, wherein providing an output signal comprises providing an output signal to at least one of: a powertrain controller, a transmission controller, a brake controller, and a steering controller to cause the vehicle to move in accordance with the requested motion.

16. A method according to claim 14 or claim 15, wherein the output signal is for limiting the speed of the vehicle to a maximum speed value.

17. A method according to claim 16, wherein the maximum speed value is zero.

18. A computer program that, when run on a processor, performs a method in accordance with any one of claims 14 to 17.

19. An apparatus, a system or a vehicle as described herein with regard to the figures.

20. A method as described herein with regard to the figures.

Intellectual

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Office

Application No: GB 1701444.0