Agricultural work vehicle and method for preventing engine stall thereof

Abstract

Provided is a method for preventing engine stall of an agricultural work vehicle, the method comprising the steps of: detecting a start attempt of the agricultural work vehicle for starting from a stopped state; when the start attempt is detected, determining whether a gear stage selected by a user is higher than or equal to a reference stage; when the selected gear stage is higher than or equal to the reference stage, determining a pressure profile for engaging a hydraulic clutch on the basis of the selected gear stage; and controlling the hydraulic clutch of the agricultural work vehicle on the basis of the determined pressure profile.

Description

Agricultural work vehicle and method to prevent engine stalling

[0001] The present disclosure relates to an agricultural work vehicle and a method for preventing the engine of the same from stopping.

[0002] Agricultural work vehicles are vehicles used for agricultural work, and may refer to, for example, rice transplanters, combines, tractors, etc. For example, a tractor can perform necessary agricultural work while attached with various implements required for agricultural work.

[0003] Power generated by the engine of an agricultural work vehicle is transmitted to the wheels via a hydraulic clutch and a transmission. For example, the hydraulic clutch transmits or cuts off power to the transmission by engaging or disengaging multi-clutch discs, which are connected to the flywheel and the transmission, respectively, through hydraulic pressure.

[0004] When agricultural work vehicles are moving from a work site to a storage site or vice versa, users often drive in a higher gear to ensure rapid movement. Higher gears have lower gear ratios, resulting in a smaller proportion of the torque generated by the engine being transmitted to the wheels. Consequently, starting an agricultural work vehicle in a high gear places a much greater load on the engine than starting it in a low gear. However, since the engine cannot generate sufficient torque to start the vehicle at low RPMs, there is a high probability that it will fail to maintain rotation and stall. Therefore, technology is required to prevent engine stalling when agricultural work vehicles start in a high gear.

[0005] The present disclosure is intended to provide a method for preventing engine stalling when an agricultural work vehicle starts in a high gear.

[0006] According to one aspect of the present disclosure, a method for preventing engine stalling of an agricultural work vehicle may include: detecting an attempt to start the agricultural work vehicle from a stationary state; determining, upon detecting the attempt to start, whether a gear ratio selected by a user is greater than or equal to a reference gear ratio; determining a pressure profile for engaging a hydraulic clutch based on the selected gear ratio if the selected gear ratio is greater than or equal to the reference gear ratio; and controlling the hydraulic clutch of the agricultural work vehicle based on the determined pressure profile.

[0007] In one embodiment, the step of determining the pressure profile may include measuring the rotational speed and torque of an engine, calculating an engine load rate using the measured rotational speed and torque of the engine, and determining the pressure profile such that the engine load rate is less than or equal to a first reference value.

[0008] In one embodiment, the step of determining the pressure profile may include measuring the rotational speed and torque of the engine and the rotational speed and torque of the wheel, calculating the power transmission rate using the measured rotational speed and torque of the engine and the rotational speed and torque of the wheel, and determining the pressure profile such that the rate of increase of the power transmission rate is constant.

[0009] In one embodiment, the step of determining the pressure profile may include measuring the rotational speed and torque of an engine, calculating the engine load rate at the current rotational speed using the measured rotational speed and torque of the engine, and determining the pressure profile such that the engine load rate at the current rotational speed is less than or equal to a second reference value.

[0010] In one embodiment, the step of detecting the starting attempt may detect the starting attempt based on at least one of whether the shuttle lever is in a forward position or a reverse position, whether there is an acceleration command from the user, and whether the brake is released.

[0011] According to one aspect of the present disclosure, a method for preventing engine stalling of an agricultural work vehicle may include: receiving a user input that activates a driving mode; determining, upon receiving the user input, whether a gear ratio selected by the user is greater than or equal to a reference gear ratio; determining a pressure profile for engaging a hydraulic clutch based on the selected gear ratio if the selected gear ratio is greater than or equal to the reference gear ratio; and controlling a hydraulic clutch of the agricultural work vehicle based on the determined pressure profile.

[0012] In one embodiment, the step of determining the pressure profile may include measuring the rotational speed and torque of an engine, calculating an engine load rate using the measured rotational speed and torque of the engine, and determining the pressure profile such that the engine load rate is less than or equal to a first reference value.

[0013] In one embodiment, the step of determining the pressure profile may include measuring the rotational speed and torque of the engine and the rotational speed and torque of the wheel, calculating the power transmission rate using the measured rotational speed and torque of the engine and the rotational speed and torque of the wheel, and determining the pressure profile such that the rate of increase of the power transmission rate is constant.

[0014] In one embodiment, the step of determining the pressure profile may include measuring the rotational speed and torque of an engine, calculating the engine load rate at the current rotational speed using the measured rotational speed and torque of the engine, and determining the pressure profile such that the engine load rate at the current rotational speed is less than or equal to a second reference value.

[0015] In one embodiment, the method may further include the step of detecting an attempt to start the agricultural work vehicle from a stationary state, and the step of determining whether the gear ratio selected by the user is greater than or equal to a reference gear ratio may determine whether the gear ratio selected by the user is greater than or equal to a reference gear ratio when the attempt to start is detected.

[0016] An agricultural work vehicle according to one embodiment can start in a high gear while driving, and the user can move conveniently without having to shift gears every time they stop and restart.

[0017] FIG. 1 is a block diagram illustrating the components of an agricultural work vehicle according to one embodiment.

[0018] FIG. 2 is a table showing the number of gear ratios according to the combination of the main transmission and auxiliary transmission in a 24-speed transmission according to one embodiment.

[0019] FIG. 3 is a flowchart illustrating a method to prevent engine stoppage of an agricultural work vehicle according to one embodiment.

[0020] FIG. 4 is a flowchart illustrating a method for detecting an attempt to start an agricultural work vehicle according to one embodiment.

[0021] FIG. 5 is a flowchart illustrating a method for generating a pressure profile for engaging a hydraulic clutch based on an engine load rate according to one embodiment.

[0022] FIG. 6 is a flowchart illustrating a method for generating a pressure profile for engaging a hydraulic clutch based on a power transmission rate according to one embodiment.

[0023] FIG. 7 is a flowchart illustrating a method for generating a pressure profile for engaging a hydraulic clutch based on engine speed according to one embodiment.

[0024] FIG. 8 is a flowchart illustrating a method to prevent engine stoppage of an agricultural work vehicle according to one embodiment.

[0025] The terms used in this disclosure have been selected to be as widely used and general as possible, taking into account their functions within this disclosure; however, these terms may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. In specific cases, terms have been selected at the applicant's discretion, and in such cases, their meanings will be described in detail in the relevant explanatory sections. Therefore, terms used in this disclosure should be defined not merely by their names, but based on their meanings and the overall content of this disclosure.

[0026] Singular expressions may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as generally understood by those skilled in the art as described in this specification.

[0027] In this disclosure, the term “and / or” includes a combination of a plurality of related described components or any of a plurality of related described components.

[0028] Terms including ordinal numbers, such as "first" or "second," used in this disclosure may be used to describe various components, but said components should not be limited by said terms. Such terms are used solely for the purpose of distinguishing one component from another.

[0029] In the present disclosure, the expression “at least one of a, b, or c” may refer to “a,” “b,” “c,” “a and b,” “a and c,” “b and c,” “all of a, b, and c,” or variations thereof.

[0030] When a part of a specification is described as "comprising" a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Furthermore, terms such as "part" or "module" as used in the specification refer to a unit that processes at least one function or operation, and this may be implemented in hardware or software, or as a combination of hardware and software.

[0031] Hereinafter, embodiments of the present disclosure are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present disclosure may be embodied in various different forms and is not limited to the embodiments described herein. Furthermore, in order to clearly explain the present disclosure in the drawings, parts unrelated to the explanation have been omitted, and similar parts throughout the specification have been given similar reference numerals. In addition, the reference numerals used in each drawing are for the purpose of explaining each drawing, and different reference numerals used in different drawings are not intended to represent different elements.

[0032] FIG. 1 is a block diagram illustrating the components of an agricultural work vehicle according to one embodiment.

[0033] Referring to FIG. 1, an agricultural work vehicle (100) may include an engine (110), a hydraulic clutch (120), a transmission (130), a hydraulic system (140), a controller (150), a sensing unit (160), a shuttle lever (170), a gear lever (180), and a driving mode switch (190). However, not all components shown in FIG. 1 are essential components. The agricultural work vehicle (100) may be implemented with more components than those shown in FIG. 1, or with fewer components.

[0034] The engine (110) can generate the power required for driving the agricultural work vehicle (100).

[0035] The hydraulic clutch (120) can transmit or disconnect power generated by the engine (110) to the transmission (130) by engaging or disengaging by hydraulic pressure. For example, the hydraulic clutch (120) may include multiple clutch disks. When the hydraulic clutch (120) is engaged, power can be transmitted to the transmission (130), and when the hydraulic clutch (120) is disengaged, power to the transmission (130) can be disconnected. The hydraulic clutch (120) can be disengaged and engaged before and after a shift (e.g., from neutral to forward).

[0036] The degree of engagement of the hydraulic clutch (120) may vary depending on the magnitude of the hydraulic pressure supplied from the hydraulic system (140). For example, if the hydraulic pressure is sufficiently large, the hydraulic clutch (120) may be fully engaged, and if the hydraulic pressure is small, the hydraulic clutch (120) may not be fully engaged and clutch slip may occur. If clutch slip occurs, the load transmitted to the engine (110) (e.g., the torque required to start the agricultural work vehicle (100) at a gear ratio selected by the user) may be reduced.

[0037] Generally, the engine (110) can generate maximum torque at medium speeds (e.g., 2000 RPM to 4000 RPM), but at low speeds (e.g., 1000 RPM), it does not generate enough torque to start the agricultural work vehicle (100) in a high gear. If a load greater than the torque the engine (110) can generate is applied to the engine (110), the engine speed begins to decrease, and due to the lowered engine speed, the torque becomes smaller, and eventually the engine (110) is unable to maintain rotation and stops. Therefore, in order for the agricultural work vehicle (100) to start in a high gear, it is necessary to control the hydraulic clutch (120) so that the load is gradually transferred to the engine (110), allowing the engine (110) to generate torque to respond to the partial load.

[0038] The transmission (130) can convert the power received through the hydraulic clutch (120) into a speed and torque determined according to the gear ratio of the gear number selected by the user and transmit it to the wheels.

[0039] The transmission (130) may include a shuttle shift that switches the driving direction (e.g., forward or reverse) of the agricultural work vehicle (100), a main transmission that converts the speed and torque of the agricultural work vehicle (100) in stages, and a sub transmission that increases the total number of gears by extending the transmission range. For example, if the main shift is an 8-speed (e.g., 1st to 8th speed) transmission and the sub transmission is a 3-speed (e.g., L-speed, M-speed, H-speed) transmission, the transmission (130) can convert the received power into 48 speeds and torques, including 24 gears in the forward direction and 24 gears in the reverse direction.

[0040] The number of gears can be defined according to the combination of the main transmission and the auxiliary transmission. For example, as shown in FIG. 2, in an example where the main transmission is an 8-speed transmission and the auxiliary transmission is a 3-speed transmission, the number of gears can be expressed as 1 when the main transmission is 1 and the auxiliary transmission is L. Similarly, the number of gears can be expressed as 13 when the main transmission is 5 and the auxiliary transmission is M, and the number of gears can be expressed as 24 when the main transmission is 8 and the auxiliary transmission is H.

[0041] The hydraulic system (140) can generate hydraulic pressure to engage or disengage the hydraulic clutch (120) based on a control signal from the controller (150). The hydraulic system (140) can generate hydraulic pressure to control the transmission (130) based on a control signal from the controller (150). The hydraulic system (140) may include, but is not limited to, a hydraulic pump that applies pressure to the hydraulic oil, a hydraulic control valve that regulates the flow of the hydraulic oil, a hydraulic oil tank that stores the hydraulic oil, and a hydraulic filter that filters out impurities mixed in the hydraulic oil.

[0042] The controller (150) can determine a pressure profile that the hydraulic system (140) must generate to prevent the engine of the agricultural work vehicle (100) from stopping. The pressure profile may represent the hydraulic pressure over time that the hydraulic system (140) must generate to engage the hydraulic clutch (120) at the time of starting. The operation of the controller (150) determining the pressure profile will be described later with reference to FIGS. 3 through 8.

[0043] The controller (150) can generate a control signal corresponding to a determined pressure profile and transmit it to the hydraulic system (140). The hydraulic system (140) can generate a corresponding hydraulic pressure based on the control signal of the controller (150).

[0044] The controller (150) may include a memory (not shown) for storing one or more instructions or programs, and a processor (not shown) that enables the controller (150) to perform the operation of determining pressure and transmitting it to the hydraulic system (140) by executing the one or more instructions or programs.

[0045] For example, memory may include at least one of flash memory, hard disk, RAM (Random Access Memory), SRAM (Static Random Access Memory), ROM (Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory), and PROM (Programmable Read-Only Memory), but is not limited thereto.

[0046] For example, the processor may be composed of at least one of a CPU (Central Processing Unit), a microprocessor, an AP (Application Processor), a GPU (Graphic Processing Unit), an ASIC (Application Specific Integrated Circuit), a DSP (Digital Signal Processor), an ECU (Electronic Control Unit), a VCU (Vehicle Control Unit), and a TCU (Transmission Control Unit), but is not limited thereto.

[0047] The sensing unit (160) may include one or more sensors that measure various physical quantities so that the controller (150) can monitor the condition of the agricultural work vehicle (100). For example, the sensing unit (160) may include at least one of a first speed sensor that measures the rotational speed of the engine (110), a first torque sensor that measures the torque of the engine (110), a second speed sensor that measures the rotational speed of the wheel, a second torque sensor that measures the torque of the wheel, a hydraulic sensor that measures the hydraulic pressure generated in the hydraulic system (140), a fuel flow sensor located near the fuel injector that measures fuel consumption, a Global Positioning System (GPS) sensor that measures the position of the agricultural work vehicle (100), a first position sensor that measures the position of the accelerator pedal or HST pedal, and a second position sensor that measures the position of the brake pedal, but is not limited thereto.

[0048] The shuttle lever (170) is a lever that can be operated by a user to change the driving direction of the agricultural work vehicle (100). For example, the shuttle lever (170) can be positioned in a forward position, a neutral position, and a reverse position. When the user pushes the shuttle lever (170) forward to position it in the forward position, the driving direction of the agricultural work vehicle (100) can be changed to forward, and when the user pulls the shuttle lever (170) backward to position it in the reverse position, the driving direction of the agricultural work vehicle (100) can be changed to reverse. When the user positions the shuttle lever (160) in the neutral position, the agricultural work vehicle (100) becomes neutral, and power from the engine (110) is not transmitted to the wheels. However, the implementation method of the shuttle lever (170) is not limited thereto, and for example, the shuttle lever (170) may be implemented to include a plurality of buttons (e.g., a forward button, a neutral button, a reverse button).

[0049] The gear shift lever (180) is a lever operable by a user to select a gear ratio of an agricultural work vehicle (100). The gear shift lever (180) may include a main gear lever and a sub-gear lever. When a user selects a gear ratio by operating the main gear lever and the sub-gear lever, the main gear and the sub-gear can shift to a gear ratio corresponding to the selected gear ratio. However, the implementation method of the gear shift lever (180) is not limited thereto, and for example, the gear shift lever (180) may be implemented to include a plurality of buttons (e.g., a plus (+) button, a minus (-) button).

[0050] The driving mode switch (190) is a switch operable by a user to activate the driving mode. The driving mode may refer to a mode in which the agricultural work vehicle (100) operates for the purpose of moving to another location without being used for agricultural work, such as moving from a work site to a storage site. When the user operates the driving mode switch (190) to ON, the driving mode may be activated, and when the user operates it to OFF, the driving mode may be deactivated. However, the implementation method of the driving mode switch (190) is not limited thereto, and for example, the driving mode switch (190) may be implemented to include one or more buttons.

[0051] FIG. 3 is a flowchart illustrating a method to prevent engine stoppage of an agricultural work vehicle according to one embodiment.

[0052] Referring to FIG. 3, in operation 301, the agricultural work vehicle (100) can detect an attempt to start from a stationary state. Operation 301 can be understood as a process to prevent subsequent operations from being performed while the agricultural work vehicle (100) is moving.

[0053] An agricultural work vehicle (100) may detect an attempt to start based on at least one of whether the shuttle lever (170) is in a forward or reverse position other than the neutral position, whether there is an acceleration command from the user, and whether the brake is released. However, the criteria for detecting an attempt to start are not limited thereto. The presence of an acceleration command from the user may include, but is not limited to, at least one of the cases where the accelerator pedal or the HST (Hydrostatic Transmission) pedal is pressed and the speed control joystick is operated. The release of the brake may include, but is not limited to, at least one of the cases where the brake pedal is released and the parking brake is released.

[0054] For example, as illustrated in FIG. 4, an agricultural work vehicle (100) can detect an attempt to start when the shuttle lever (170) is in a forward or reverse position (i.e., not in a neutral position), there is an acceleration command from the user, and the brake is released.

[0055] However, FIG. 4 illustrates that the agricultural work vehicle (100) detects an attempt to start when all of the aforementioned criteria are satisfied, but the present disclosure is not limited thereto and may be implemented to detect an attempt to start when some of the aforementioned criteria are satisfied.

[0056] In operation 302, the agricultural work vehicle (100) can determine whether the gear ratio selected by the user is greater than or equal to a reference ratio. In one embodiment, the reference ratio may be predetermined based on the total number of gear ratios of the transmission (130). For example, if the total number of gear ratios is 24, the reference ratio may be 13. In one embodiment, the reference ratio may be predetermined based on the number of gear ratios of the auxiliary transmission. For example, if the auxiliary transmission is a 3-speed transmission (e.g., L, M, H), the reference ratio may be H.

[0057] In operation 303, the agricultural work vehicle (100) can determine a pressure profile for engaging the hydraulic clutch (120) based on the selected gear ratio if the selected gear ratio is greater than or equal to the reference gear ratio. Since a gear ratio corresponding to each gear ratio is determined, the agricultural work vehicle (100) can determine the torque that the engine (110) must generate to successfully start at the selected gear ratio. Since the torque that the engine (110) can generate at low speeds is limited, the agricultural work vehicle (100) can determine a pressure profile such that the load is not transmitted to the engine (110) instantaneously but is transmitted gradually.

[0058] A pressure profile for engaging the hydraulic clutch (120) can be predetermined for each gear ratio and stored in the memory of the controller (150). In this case, the agricultural work vehicle (100) can generate a control signal for the hydraulic system (140) according to the stored pressure profile.

[0059] In one embodiment, an agricultural work vehicle (100) may determine a pressure profile for engaging a hydraulic clutch (120) based on at least one of an engine load rate, a power transmission rate, and an engine speed. An operation in which the agricultural work vehicle (100) determines a pressure profile by each of the aforementioned elements is described later with reference to FIGS. 5 to 7.

[0060] In operation 304, the agricultural work vehicle (100) can engage the hydraulic clutch (120) based on a determined pressure profile. If a predetermined pressure profile is stored in memory, operation 304 can be performed when the shuttle lever (170) is moved from a neutral position to a forward or reverse position and the throttle is input.

[0061] FIG. 5 is a flowchart illustrating a method for generating a pressure profile for engaging a hydraulic clutch based on an engine load rate according to one embodiment.

[0062] Referring to FIG. 5, in operation 501, the agricultural work vehicle (100) can measure the rotational speed and torque of the engine (110). For example, the rotational speed of the engine (110) can be obtained using a first speed sensor, and the torque of the engine (110) can be measured using a first torque sensor.

[0063] In operation 502, the agricultural work vehicle (100) can calculate the engine load rate (A) using the rotational speed and torque of the engine (110). For example, the engine load rate (A) can be calculated using Equation 1.

[0064]

[0065] In operation 503, the agricultural work vehicle (100) can determine a pressure profile for engaging the hydraulic clutch (120) so that the engine load rate (A) is below a reference value. For example, the reference value may be 50%, but is not limited thereto. When the engine load rate (A) is maintained below the reference value, a load is applied to the engine (110) at a level that the engine (110) can handle, which causes the engine (110) to gradually increase its rotational speed to generate greater torque and the agricultural work vehicle (100) can start.

[0066] FIG. 6 is a flowchart illustrating a method for generating a pressure profile for engaging a hydraulic clutch based on a power transmission rate according to one embodiment.

[0067] Referring to FIG. 6, in operation 601, the agricultural work vehicle (100) can measure the rotational speed and torque of the engine (110) and the rotational speed and torque of the wheels. For example, the rotational speed of the engine (110) can be measured using a first speed sensor, the torque of the engine (110) can be measured using a first torque sensor, the rotational speed of the wheels can be measured using a second speed sensor, and the torque of the wheels can be measured using a second torque sensor.

[0068] In operation 602, the agricultural work vehicle (100) can calculate the power transfer rate (B) using the rotational speed and torque of the engine (110) and the rotational speed and torque of the wheels. The power transfer rate (B) refers to the ratio of the output generated by the engine to the wheels. For example, the power transfer rate (B) can be calculated using Equation 2.

[0069]

[0070] In operation 603, the agricultural work vehicle (100) can determine a pressure profile for engaging the hydraulic clutch (120) so that the rate of increase of the power transmission rate (B) is constant. For example, the rate of increase of the power transmission rate (B) can be predetermined per gear ratio based on the specifications of the engine. When the power transmission rate (B) increases at a constant rate, a load is applied to the engine (110) at a level that the engine (110) can handle, and as a result, the engine (110) can gradually increase its rotational speed to generate greater torque and the agricultural work vehicle (100) can start.

[0071] FIG. 7 is a flowchart illustrating a method for generating a pressure profile for engaging a hydraulic clutch based on engine speed according to one embodiment.

[0072] Referring to FIG. 7, in operation 701, the agricultural work vehicle (100) can measure the rotational speed and torque of the engine (110). For example, the rotational speed of the engine (110) can be obtained using a first speed sensor, and the torque of the engine (110) can be measured using a first torque sensor.

[0073] In operation 702, the agricultural work vehicle (100) can calculate the engine load rate (C) at the current rotational speed using the rotational speed of the engine (110). The engine load rate (C) at the current rotational speed is the ratio of the current output to the maximum output of the engine at the current rotational speed. For example, the engine load rate (C) at the current rotational speed can be calculated using Equation 3.

[0074]

[0075] In operation 703, the agricultural work vehicle (100) can determine a pressure profile for engaging the hydraulic clutch (120) such that the engine load rate (C) at the current rotational speed is below a reference value. For example, the reference value may be 100%, but is not limited thereto. When the engine load rate (C) at the current rotational speed is maintained below the reference value, a load is applied to the engine (110) at a level that the engine (110) can handle, which causes the engine (110) to gradually increase its rotational speed to generate greater torque and the agricultural work vehicle (100) can start.

[0076] FIG. 8 is a flowchart illustrating a method to prevent engine stoppage of an agricultural work vehicle according to one embodiment.

[0077] The operations of FIG. 8 describe an embodiment in which the agricultural work vehicle (100) is not performed when used for work, but is performed only when driving. In the description of FIG. 8, detailed descriptions of operations that overlap with previous descriptions are omitted.

[0078] Referring to FIG. 8, in operation 801, the agricultural work vehicle (100) may receive user input to activate the driving mode. The user may activate the driving mode by operating the driving mode switch (190) to enable the high-gear starting function of the agricultural work vehicle (100). The agricultural work vehicle (100) may repeatedly start and stop not only while driving but also while working, and a large load may be applied to the engine (110), which may increase the engine load rate. Therefore, operation 801 can be understood as a process to prevent subsequent operations from being performed when the agricultural work vehicle (100) is used for work.

[0079] As described above, the agricultural work vehicle (100) may be implemented without including a driving mode switch (190). In this example, the agricultural work vehicle (100) can determine whether the agricultural work vehicle (100) is driving or working, and can perform subsequent operations only when it is driving.

[0080] For example, an agricultural work vehicle (100) can determine whether the agricultural work vehicle (100) is in motion based on an average speed over a predetermined period of time. Since the speed of the agricultural work vehicle (100) is generally higher when in motion than when in motion, the agricultural work vehicle (100) can determine that it is in motion if the average speed over a predetermined period of time is, for example, 10 km / h or higher, and that it is not in motion if it is less than 10 km / h. However, the standard average speed for distinguishing whether it is in motion is not limited to this.

[0081] For example, an agricultural work vehicle (100) can determine whether the agricultural work vehicle (100) is in motion based on whether the Power Take-Off (PTO) is operating. The PTO is a device that transmits power generated by the engine (110) to a work implement attached to the agricultural work vehicle (100). For example, the agricultural work vehicle (100) can determine that it is in motion if the PTO is not operating, and can determine that it is not in motion if the PTO is operating.

[0082] For example, an agricultural work vehicle (100) can determine whether the agricultural work vehicle (100) is in motion based on whether the hydraulic lift is operating. A hydraulic lift is a device that uses hydraulic pressure to raise or lower implements such as plows and loaders. For example, the agricultural work vehicle (100) can determine that it is in motion if the hydraulic lift is not operating, and can determine that it is not in motion if the hydraulic lift is operating.

[0083] For example, an agricultural work vehicle (100) can determine whether the agricultural work vehicle (100) is in operation based on the engine load rate during a predetermined prior time. The engine load rate refers to the ratio of the current output to the maximum output of the engine. When the agricultural work vehicle (100) is in operation, the engine load rate tends to be relatively low and maintained at a relatively constant value, and when the agricultural work vehicle (100) is in operation, the engine load rate tends to be relatively high and fluctuate significantly. For example, the agricultural work vehicle (100) can determine that it is in operation if the average of the engine load rate during a predetermined prior time is below a reference value, and can determine that it is not in operation if it exceeds the reference value. For example, the agricultural work vehicle (100) can determine that it is in operation if the amount of change in the engine load rate during a predetermined prior time is below a reference value, and can determine that it is not in operation if it exceeds the reference value.

[0084] For example, an agricultural work vehicle (100) can determine whether the agricultural work vehicle (100) is driving based on location data from a predetermined previous time. If the agricultural work vehicle (100) is driving, the location data indicates linear movement or changes along a certain path, and if the agricultural work vehicle (100) is working, the location data indicates repetitive movement in a specific area. For example, the agricultural work vehicle (100) can determine that it is driving if the location data from a predetermined previous time indicates linear movement of a predetermined length or longer, and otherwise determine that it is not driving.

[0085] However, the method of determining whether the agricultural work vehicle (100) is in motion is not limited to this, and for example, the agricultural work vehicle (100) may determine whether it is in motion by a combination of two or more of the aforementioned criteria.

[0086] In operation 802, the agricultural work vehicle (100) can detect an attempt to start the agricultural work vehicle (100) from a stationary state.

[0087] In one embodiment, operation 802 may be performed optionally. In an example where operation 802 is omitted, the agricultural work vehicle (100) may perform subsequent operations while moving. While the agricultural work vehicle (100) is moving, it is likely that the engine (110) is in a state capable of generating torque greater than the load applied to the engine (110), and therefore, in most cases, the engine (110) is unlikely to stop. However, when the agricultural work vehicle (100) enters an uphill road or is driven with a heavy implement attached, such as a trailer, a load greater than the maximum torque the engine (110) can generate may be applied to the engine (110) instantaneously, and as a result, the engine (110) may stop.

[0088] A method for preventing engine stoppage of an agricultural work vehicle (100) according to one embodiment can control the load applied to the engine (110) through pressure profile control even while the agricultural work vehicle (100) is moving, and can improve driving stability.

[0089] In operation 803, the agricultural work vehicle (100) can determine whether the gear ratio selected by the user is greater than or equal to the reference ratio.

[0090] In operation 804, the agricultural work vehicle (100) can determine a pressure profile for engaging the hydraulic clutch (120) based on the selected gear ratio if the selected gear ratio is greater than or equal to the reference gear ratio.

[0091] In operation 805, the agricultural work vehicle (100) can engage the hydraulic clutch (120) based on a determined pressure profile.

[0092] The embodiments of the present disclosure described above may be implemented in the form of a recording medium comprising computer-executable instructions, such as program modules executed by a computer. A computer-readable medium may include any volatile and non-volatile media, and removable and inseparable media, that can be accessed by a computer. Additionally, a computer-readable medium may include computer storage media and communication media. A computer storage medium may include volatile and non-volatile, removable and inseparable media implemented by any method or technique for storing information, such as computer-readable instructions, data structures, program modules, or other data. A communication medium may include other data of modulated data signals, such as computer-readable instructions, data structures, or program modules.

[0093] The foregoing description of the present disclosure is for illustrative purposes only, and those skilled in the art will understand that other specific forms can be easily modified without altering the technical concept or essential features of the present disclosure. Therefore, all of the above descriptions should be understood as illustrative and not limiting. For example, a component described in a single form may be implemented in a distributed manner, and components described in a distributed manner may likewise be implemented in a combined manner.

[0094] The scope of the present disclosure is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalents thereof should be interpreted as being included within the scope of the present disclosure.

Claims

1. As a method to prevent engine stalling of an agricultural work vehicle, A step of detecting an attempt to start the above agricultural work vehicle from a stationary state; A step of determining whether the gear selected by the user is greater than or equal to a reference gear when the above-mentioned starting attempt is detected; If the selected gear ratio is greater than or equal to the reference ratio, a step of determining a pressure profile for engaging a hydraulic clutch based on the selected gear ratio; and A method for preventing engine stoppage of an agricultural work vehicle, comprising the step of controlling the hydraulic clutch of the agricultural work vehicle based on the pressure profile determined above.

2. In Paragraph 1, The step of determining the above pressure profile is, Step of measuring engine rotational speed and torque, A step of calculating an engine load rate using the rotational speed and torque of the engine measured above, and A method for preventing engine stoppage of an agricultural work vehicle, comprising the step of determining the pressure profile such that the engine load rate is less than or equal to a first reference value.

3. In Paragraph 1, The step of determining the above pressure profile is, Step of measuring the engine's rotational speed and torque, and the wheel's rotational speed and torque, A step of calculating the power transmission rate using the rotational speed and torque of the engine and the rotational speed and torque of the wheel measured above, and A method for preventing engine stoppage of an agricultural work vehicle, comprising the step of determining the pressure profile such that the rate of increase of the power transmission rate is constant.

4. In Paragraph 1, The step of determining the above pressure profile is, Step of measuring engine rotational speed and torque, A step of calculating the engine load rate at the current rotational speed using the rotational speed and torque of the engine measured above, and A method for preventing engine stoppage of an agricultural work vehicle, comprising the step of determining the pressure profile such that the engine load rate at the current rotational speed is less than or equal to a second reference value.

5. In Paragraph 1, The step of detecting the above-mentioned departure attempt is, A method for preventing engine stoppage of an agricultural work vehicle, which detects the attempt to start based on at least one of whether the shuttle lever is in a forward or reverse position, whether there is an acceleration command from the user, and whether the brake is released.

6. As a method to prevent engine stalling of an agricultural work vehicle, A step of receiving user input to activate a driving mode; A step of determining whether the gear ratio selected by the user is greater than or equal to a reference gear ratio upon receiving the above user input; If the selected gear ratio is greater than or equal to the reference ratio, a step of determining a pressure profile for engaging a hydraulic clutch based on the selected gear ratio; and A method for preventing engine stoppage of an agricultural work vehicle, comprising the step of controlling the hydraulic clutch of the agricultural work vehicle based on the pressure profile determined above.

7. In Paragraph 6, The step of determining the above pressure profile is, Step of measuring engine rotational speed and torque, A step of calculating an engine load rate using the rotational speed and torque of the engine measured above, and A method for preventing engine stoppage of an agricultural work vehicle, comprising the step of determining the pressure profile such that the engine load rate is less than or equal to a first reference value.

8. In Paragraph 6, The step of determining the above pressure profile is, Step of measuring the engine's rotational speed and torque, and the wheel's rotational speed and torque, A step of calculating the power transmission rate using the rotational speed and torque of the engine and the rotational speed and torque of the wheel measured above, and A method for preventing engine stoppage of an agricultural work vehicle, comprising the step of determining the pressure profile such that the rate of increase of the power transmission rate is constant.

9. In Paragraph 6, The step of determining the above pressure profile is, Step of measuring engine rotational speed and torque, A step of calculating the engine load rate at the current rotational speed using the rotational speed and torque of the engine measured above, and A method for preventing engine stoppage of an agricultural work vehicle, comprising the step of determining the pressure profile such that the engine load rate at the current rotational speed is less than or equal to a second reference value.

10. In Paragraph 6, The above method is, The above agricultural work vehicle further includes the step of detecting an attempt to start from a stationary state, and The step of determining whether the gear ratio selected by the user is greater than or equal to the reference ratio is, A method for preventing engine stoppage of an agricultural work vehicle, which detects the above-mentioned attempt to start and determines whether the gear ratio selected by the user is greater than or equal to a reference gear ratio.

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