The present disclosure generally relates to a system and method of detecting a track temperature issue and/or controlling a vehicle, such as an agricultural tractor, based on track temperature.
The rubber tracks of tracked machines may overheat during operation, especially when the tracked machine is carrying a heavy load, is operating at high speeds, or when the track is misaligned. Tracks may heat up quickly in a particular area, such as the treadbars. Transporting large hitch loads at top speeds may cause the track (e.g., the treadbars) to overheat and fail. To prevent overheating of the track, failure of the track, and/or damage to the track, the maximum speed of the vehicle can be restricted in all operating conditions (e.g., blanket speed restriction).
Various aspects of examples of the present disclosure are set out in the claims.
According to an aspect of the present disclosure, a work vehicle such as a tractor or agricultural combine is disclosed that includes an engine, a drive train driven by the engine, a track system including at least one track, the track system connected to the drive train, a temperature sensor configured to sense a track temperature of the at least one track, and a vehicle control system configured to receive the track temperature and configured to control the speed of the vehicle based on the track temperature. The vehicle may also include an operator alerting apparatus for alerting an operator of a speed condition or a track condition. The vehicle control system may be configured to restrict the speed of the vehicle based on the track temperature. The vehicle control system may limit the speed of the vehicle
The at least one track may include a carcass, a plurality of treads, and a plurality of lugs, the temperature sensor may be positioned at least partially within at least one of the plurality of lugs, at least one of the plurality of treads, and/or the carcass. The temperature sensor may be a non-contact sensor that is substantially free of contact with the at least one track. The temperature sensor may be positioned in a portion of the drive train that is in contact with the at least one track or is positioned in a portion of the track system that is contact with the at least one track.
The vehicle control system may be configured to restrict the speed of the vehicle below a maximum speed of the vehicle when the track temperature is approaching a maximum temperature of the at least one track.
The temperature sensor may be configured to wirelessly transmit the track temperature to a receiver, which may be communicatively connected to the vehicle control system. The receiver may be wirelessly connected to the vehicle control system.
The track system may include two tracks or four tracks, where each of the tracks includes at least one temperature sensor or where each of the tracks may include a plurality of temperature sensors. Alternatively, more than one track but less than all tracks can include at least one temperature sensor.
The vehicle may also include a load sensor for sensing a vehicle load and the vehicle control system can be configured to restrict the speed of the vehicle based on the track temperature and on the vehicle load.
According to an aspect of the present disclosure, a method for controlling a work vehicle including at least one track is disclosed. The work vehicle may be capable of traveling at a maximum speed. The method can include monitoring a track temperature of the at least one track, and restricting the speed of the work vehicle to a restricted speed based on the track temperature, wherein the restricted speed is less than the maximum speed. The method may also include determining if the track temperature is approaching a failure limit based on the track temperature and restricting the speed of the work vehicle based on the determination. The method may also include providing an alert to an operator of the vehicle. The method may also include determining that at least one track is misaligned. An alert may be provided to the operator of the vehicle that the at least one track is misaligned. The method may also include removing the speed restriction when the track temperature lowers.
According to an aspect of the present disclosure, a track system is disclosed that can include a track, a track temperature sensor configured to sense a track temperature of the track and a controller connected to the track temperature sensor, the controller configured to restrict a speed of a vehicle based on the track temperature.
The above and other features will become apparent from the following description and accompanying drawings.
The detailed description of the drawings refers to the accompanying figures in which:
Like reference numerals are used to indicate like elements throughout the several figures.
As will become apparent from the disclosure herein, the disclosed vehicle control system with track temperature monitoring may be used in a variety of settings and with a variety of work machines.
For example, referring now to
As another example of a work vehicle, and referring to
Drive train 14 (see e.g.
Endless track 20 is an endless track having an elastomeric body 26, an outer side 28 displaying a series of ground engaging profiles and an inner side 30 displaying a series of drive lugs adapted to be engaged by drive sprockets on drive wheel 16 of vehicle 10. In view of its underlying nature, the elastomeric body 26 can be referred to as a “carcass.” The elastomeric body 26 is elastomeric in that it comprises elastomeric material. The elastomeric material can be any polymeric material with the property of elasticity. In this case, the elastomeric material of the elastomeric body 26 includes rubber. Various rubber compounds may be used and, in some cases, different rubber compounds may be present in different areas of the elastomeric body 26. In other cases, the elastomeric material of the elastomeric body 26 may include another elastomer in addition to or instead of rubber (e.g., polyurethane elastomer). The elastomeric body 26 can comprise one or more reinforcements embedded in its elastomeric material. For example, one such reinforcement may be a layer of reinforcing cables (e.g., cords or wire ropes) that extend generally in the longitudinal direction of the endless track 20 to enhance its strength in tension along its longitudinal direction. Another example of a reinforcing member is a layer of reinforcing fabric that comprises pliable material made usually by weaving, felting, or knitting natural or synthetic fibers (e.g., a ply of reinforcing woven fibers).
The ground engaging profiles comprise a plurality of traction projections (sometimes referred to as “traction lugs”, “drive treads,” “tread members” or “tread bars”) distributed on the ground-engaging outer side 28. Each of the traction projections can have an elongated shape and can be angled relative to the longitudinal direction of the endless track 20. The traction projections of the ground engaging profiles may have various other shapes in other examples (e.g., curved shapes, shapes with straight parts and curved parts, etc.). Ground engaging profiles can comprise elastomeric material. The elastomeric material of the ground engaging profiles can be any polymeric material with suitable elasticity, such as rubber. Various rubber compounds may be used and, in some cases, different rubber compounds may be present in different areas of the ground engaging profiles. In other embodiments, the elastomeric material of at least some of the ground engaging profiles may include another elastomer in addition to or instead of rubber.
The inner side 30 of the endless track 20 contacts the drive wheel 16 in order to cause motion of the endless track 20 around the idler wheels 22 and bogie wheels 24. The idler wheels 22 and/or bogies can help support part of the weight of the vehicle 10 on the ground via the endless track 20, guide the endless track 20 as it is driven by the drive wheel 16, and/or tension the endless track 20. Drive lugs extend inwardly from the inner side 30 of endless track 20 and engage the drive wheel 16. Drive lugs also help to guide the endless track 20 as it is driven by drive wheel 16 to help prevent undesired lateral movement or de-tracking of endless track 20. Drive lugs can interact with idler wheels 22 to guide the endless track 20. Drive lugs can be considered to be drive or guide projections in that they help with the driving and the guiding of endless track 20. Drive lugs can each comprise elastomeric material. The elastomeric material of the drive lugs can be any polymeric material with suitable elasticity, such as rubber. Various rubber compounds may be used and, in some cases, different rubber compounds may be present in different areas of the drive lugs. In other embodiments, the elastomeric material of at least some of the drive lugs may include another elastomer in addition to or instead of rubber.
Additionally, the inner side 30 of endless track 20 can be also frictionally driven by drive wheel 16 such that friction between inner side 30 and drive wheel 16 helps to cause motion of the endless track 20. In some embodiments, endless track 20 may not include drive lugs, or may include smaller guide lugs, and the endless track 20 may be driven mostly via friction with the drive wheel 16.
The drive wheel 16 rotates when the axle 18 rotates when being driven by drive train 14. Rotation of the drive wheel 16 rotates the endless track 20 and causes vehicle 10 to be propelled on the ground. Vehicle 10 has a maximum transport operational speed (e.g., SpeedMax) as designed for normal operation or determined through testing in normal conditions. Endless track 20 may heat up due to any combination of friction caused by speed, friction caused by the type of ground surface (e.g., heat builds up more in ground engaging profiles on paved roads), friction caused by the load on the vehicle 10 (e.g., higher load carried by a hitch of vehicle 10 results in increased friction), and/or friction caused by misalignment with the drive wheel 16, the idler wheels 22, and/or the bogie wheels 24. Endless tracks 20 that are overheated may fail (e.g., break or tear) or may be more easily misaligned or otherwise negatively impact the performance of vehicle 10. To prevent a failure of endless track 20 or other negative performance impact, a vehicle control system 200 shown in
Vehicle control system 200 includes a vehicle controller 202 that is connected to an operator input 204, to an engine 206, and a drive train 208. The engine 206 and drive train 208 provide motive power to at least one track drive 210. The operator input 204 is used to request or command by the operator the vehicle controller 202 to operate at a certain speed, a certain engine RPM in a certain gear, or otherwise provide inputs to the vehicle controller 202 that cause the vehicle 10 to travel at a speed. Alternately, a guidance program/logic or a remote command can be used to command the vehicle 10 at a speed, RPM/gear, etc. Vehicle controller 202 can determine or sense the speed of vehicle 10, or receive speed information from another sensor, as is known by a person of ordinary skill in the art.
Track drive 210 includes a track 212, such as the endless track 20 described above. Track 212 includes drive lugs 214. Track 212 includes a track sensor 216 to monitor the track temperature of track drive 210. For example, track sensor 216 can be embedded, or positioned at least partially, in a drive lug 214-S. In alternate embodiments, track sensor 216 may be embedded or at least partially positioned in the carcass or tread bar. Track sensor 216 wirelessly transmits track temperature information via a suitable wireless protocol (e.g., proprietary or standardized) to a sensor transceiver 218. Sensor transceiver 218 may be a special purpose transceiver or receiver or may be a wireless protocol receiver or transceiver such as Bluetooth or NFC. Vehicle controller 202 is connected to the sensor transceiver 218 (e.g., by a CAN or LIN bus or by a wireless protocol) and receives the track temperature information. Based on the track temperature information, vehicle controller 202 is configured to restrict an operating speed of vehicle 10 when the track temperature approaches component failure levels. For example, the vehicle controller 202 could use lookup tables to determine a maximum allowed operating speed at a given track temperature. The lookup tables, or other logical configuration, could use additional information such as vehicle or hitch loading in addition to track temperature.
Track sensor 216 may be positioned in the track 212 such that it provides temperature information about a portion of the track 212 that is less warm than other portions of the track 212. Vehicle controller 202 can be configured with logic to control vehicle speed with this temperature information even though it is not the temperature information for the warmest part of the track 212. Or the track temperature data from one part of the track can be correlated to another part of the track. Alternately, track sensor 216 can sense a temperature of a part of the vehicle that is in contact with track 212, such as an axle or the drive wheel, and the vehicle controller 202 can correlate the sensed temperature to a track temperature. Testing and monitoring of track temperature data can be used to logically configure the vehicle controller 202 and correlate track temperature information.
Track sensor 216 could be a tire pressure monitor sensor that senses temperature or is modified to sense temperature. Track sensor 216 can be a thermocouple and include wires that are positioned in the track 212. Track sensor 216 can be powered by a rechargeable battery that can be recharged during operation of the vehicle (e.g., inductively charged by an inductive charging transmitter or thermoelectrically charged by a thermoelectric circuit in the track). For example, the sensor transceiver 218 could also serve to inductively charge track sensor 216.
Alternately, the track sensor 216 may also be a pyrometer (e.g., an infrared thermometer) or other remote sensing device that can measure the temperature of a surface of the track 212 and provide the temperature information to the vehicle controller 202. Such a sensor could be positioned on the track drive unit or on the vehicle, such as within the undercarriage. Such a sensor may be connected by wires, data bus, wireless connection, or other suitable communication mechanism.
Vehicle controller 202 may be connected to an operator alerting device 220 inside the cab. The vehicle controller 202 may cause the operator alerting device 220 to alert to the operator a warning message or signal in addition to or instead of restricting the operating speed of vehicle 10. The vehicle controller 202 may also inform the operator on operator alerting device 220 when the speed restriction has been removed or revised or that the temperature warning parameters have subsided. In alternate embodiments, vehicle control system 200 may be configured to provide alerts to the operator alerting device 220 to enable the operator to make decisions on controlling the speed of vehicle 10 instead of directly controlling the speed (e.g., open loop control). In other embodiments, the vehicle controller 202 may alert the operator to control the speed prior to initiating automatic speed restrictions. The vehicle controller 202 may also alert the operator that a track temperature condition has subsided and prompt the operator that the vehicle speed may be increased.
Referring now to the flow chart of
Alternately, instead of removing the speed restriction at step 312 the vehicle controller 202 may revise the RestrictedSpeedMax (e.g., Revised RestrictedSpeedMax) to a faster speed (or a slower speed) that is less than or equal to the SpeedMax of vehicle 10. In other words, there may be different RestrictedSpeedMax settings for different T-Tracks or T-Track ranges or the vehicle controller 202 may determine that further reduction in speed is required to prevent sub-optimal operation of the track 212. For example, vehicle controller 202 could progressively step down or step up vehicle speeds based on T-track or utilize other suitable control logic to control vehicle speed based on track temperature.
In alternate embodiments, the vehicle controller 202 can also proceed from step 306 to step 314 to alert the operator and provide a track temperature warning. Such an alert may alert the operator that the speed of vehicle 10 has been restricted and/or may instruct the operator to command a slower speed. Other suitable alerts may be used. Furthermore, the vehicle controller 202 may proceed to step 316 from step 312 to inform the operator that the speed restriction has been removed and/or revised.
Changes in track temperature may indicate that the track is misaligned. For example, a sensor in a drive lug could be used to detect such misalignment as the drive lug interacts with the drive wheel. Vehicle controller 202 may alert at step 314 that the track 212 may be experiencing such a misalignment condition. In some embodiments, the vehicle controller 202 can be configured to provide a misalignment warning prior to restricting the speed of vehicle 10. If the temperature of each track of a multi-track vehicle is monitored, the vehicle controller 202 may be configured to alert the operator which specific track or tracks are experiencing misalignment conditions. In additional embodiments, the vehicle controller 202 may alert a track alignment controller to automatically adjust or correct the track alignment.
The vehicle control system 200 may further include at least one load sensor 222 that senses a load on vehicle 10. For example, load sensors 222 could be used on the axles to determine the load on vehicle 10. Load sensors 222 could also be used on the hitch or drawbar to sense the load on the vehicle 10. Vehicle controller 202 could be configured to take into account the vehicle load and track temperature when determining whether to restrict the operating temperature of the vehicle 10. The vehicle load could also be used to provide misalignment warnings. For example, the vehicle controller 202 could alarm the operator of a track misalignment if the track temperature increases when the vehicle 10 is not under a large load. For example, the vehicle controller 202 could monitor the vehicle load in step 318 and utilize this information in step 306 to help determine whether to restrict the vehicle speed, to help determine the optimum speed restriction, or to determine whether to issue a misalignment warning or other warning.
Referring now to
Without in any way limiting the scope, interpretation, or application of the claims appearing below, a technical effect of one or more of the example embodiments disclosed herein is using smart speed control to allow the vehicle to operate at maximum speeds instead of using a blanket worst case speed restriction to prohibitively restrict speeds even when the track temperature is not problematic. Another technical effect of one or more of the example embodiments disclosed herein is a sensing and warning system for track misalignment.
As used herein, “controller” is intended to be used consistent with how the term is used by a person of skill in the art, and refers to a computing component with processing, memory, and communication capabilities which is utilized to control or communicate with one or more other components. In certain embodiments, a controller may also be referred to as a control unit, vehicle control unit (VCU), engine control unit (ECU), transmission control unit (TCU), or hydraulic, electrical or electro-hydraulic controller. In certain embodiments, a controller may be configured to receive input signals in various formats (e.g., hydraulic signals, voltage signals, current signals, CAN messages, optical signals, radio signals), and to output command signals in various formats (e.g., hydraulic signals, voltage signals, current signals, CAN messages, optical signals, radio signals).
Embodiments of the present disclosure may be described herein in terms of logical block components and various steps, including in flow charts. It should be appreciated that such block components and steps may be realized by any number of appropriately-configured hardware, logic, software, and/or firmware components. For example, an embodiment of the present disclosure may employ various software logic, firmware, and/or integrated circuit components (e.g., memory elements, digital signal processing elements, logic elements, look-up tables) which may carry out a variety of logical steps under the control of one or more microprocessors or other control devices. In addition, those skilled in the art will appreciate that embodiments of the present disclosure may be practiced in conjunction with any number of systems, and that the vehicle 10 described herein is merely one exemplary embodiment of the present disclosure. Further, although certain embodiments of the disclosure are illustrated as a flowchart, the disclosure is not limited to such steps and the order of steps presented, and it would be well within the skill of one of ordinary skill in the art to reorder, combine, or split many of the steps and achieve the same result.
As used herein, “e.g.” is utilized to non-exhaustively list examples, and carries the same meaning as alternative illustrative phrases such as “including,” “including, but not limited to,” and “including without limitation.”
As used herein, unless otherwise limited or modified, lists with elements that are separated by conjunctive terms (e.g., “and”) and that are also preceded by the phrase “one or more of,” “at least one of,” “at least,” or a like phrase, indicate configurations or arrangements that potentially include individual elements of the list, or any combination thereof. For example, “at least one of A, B, and C” and “one or more of A, B, and C” each indicate the possibility of only A, only B, only C, or any combination of two or more of A, B, and C (A and B; A and C; B and C; or A, B, and C).
As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. Further, “comprises,” “includes,” and like phrases are intended to specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
For the sake of brevity, conventional techniques and arrangements related to signal processing, data transmission, signaling, control, and other aspects of the systems disclosed herein may not be described in detail. Furthermore, the connecting lines shown in the various figures contained herein are intended to represent example relationships and/or connections between the various elements (e.g., electrical power connections, communications, and physical couplings). It should be noted that many alternative or additional relationships or connections may be present in an embodiment of the present disclosure.
While the present disclosure has been illustrated and described in detail in the drawings and foregoing description, such illustration and description is not restrictive in character, it being understood that illustrative embodiment(s) have been shown and described and that all changes and modifications that come within the spirit of the present disclosure are desired to be protected. Alternative embodiments of the present disclosure may not include all of the features described yet still benefit from at least some of the advantages of such features. Those of ordinary skill in the art may devise their own implementations that incorporate one or more of the features of the present disclosure and fall within the spirit and scope of the appended claims.
This application claims priority from co-pending U.S. patent application Ser. No. 15/997,458, Jun. 4, 2018 by Garvin et al. and entitled VEHICLE CONTROL SYSTEM WITH TRACK TEMPERATURE SENSING which claims priority from U.S. Pat. No. 9,989,976 which was filed as application Ser. No. 15/265,209 on Sep. 14, 2016 and which claims priority from U.S. Provisional App. Ser. No. 62/271,148, which was filed Dec. 22, 2015, wherein the entire contents of all of the applications are hereby incorporated by reference for all that they teach.
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Number | Date | Country | |
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Parent | 15997458 | Jun 2018 | US |
Child | 16600525 | US | |
Parent | 15265209 | Sep 2016 | US |
Child | 15997458 | US |