阅读说明：本技术 工程机械的离合器切断控制装置以及工程机械 (Clutch disconnection control device for construction machine, and construction machine ) 是由 于波 吴广 张健刚 于 2019-02-28 设计创作，主要内容包括：本申请涉及机械设备领域,尤其涉及一种工程机械的离合器切断控制装置以及工程机械。其中,所述离合器切断控制装置包括：压力检测单元,用于检测制动压力；能够接收所述制动压力的车辆控制单元；所述车辆控制单元在所述制动压力大于预定压力阈值时输出执行离合器切断动作的切断控制信号；其中,所述车辆控制单元具有多个切断模式,不同所述切断模式下的预定压力阈值不同；可操作地连接所述车辆控制单元的离合器控制单元,以根据所述切断控制信号执行离合器切断动作。该工程机械的离合器切断控制装置以及工程机械能够提供不同的离合器切断介入时机的选择。(The application relates to the field of mechanical equipment, in particular to a clutch cut-off control device of engineering machinery and the engineering machinery. Wherein the clutch cutoff control device includes: a pressure detection unit for detecting a brake pressure; a vehicle control unit capable of receiving the brake pressure; the vehicle control unit outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a predetermined pressure threshold; wherein the vehicle control unit has a plurality of cut-off modes, different predetermined pressure thresholds being different in the cut-off modes; a clutch control unit operatively connected to the vehicle control unit to perform a clutch cutoff action in accordance with the cutoff control signal. The clutch cut-off control device of the construction machine and the construction machine can provide selection of different clutch cut-off intervention timings.)

1. A clutch disconnection control device for a construction machine, comprising:

a pressure detection unit for detecting a brake pressure;

a vehicle control unit capable of receiving the brake pressure; the vehicle control unit outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a predetermined pressure threshold; wherein the vehicle control unit has a plurality of cut-off modes, different predetermined pressure thresholds being different in the cut-off modes;

a clutch control unit operatively connected to the vehicle control unit to perform a clutch cutoff action in accordance with the cutoff control signal.

2. The control device according to claim 1, further having a manipulation section for receiving a user manipulation instruction; the control part is connected with the vehicle control unit so as to input the control instruction to the vehicle control unit; and the vehicle control unit determines a current preset pressure threshold value according to the control command so as to determine a current cut-off mode.

3. The control device of claim 2, wherein the manipulation part comprises a button; the vehicle control unit determines a current predetermined pressure threshold according to the push signal input by the button.

4. The control device according to claim 2 or 3, further comprising a display portion; the display part is used for displaying the current cutting-off mode.

5. The control device according to claim 4, wherein the display portion includes a plurality of indicator lamps corresponding to different shut-off modes; the vehicle control unit can light an indicator lamp corresponding to a current key-off mode.

6. A control device according to claim 2 or 3, wherein a plurality of said cut-off modes include: a first cut-off mode, a second cut-off mode, and a third cut-off mode; wherein the content of the first and second substances,

in the case of the first cut-off mode, the vehicle control unit outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a first predetermined pressure threshold;

in the case of the second cut-off mode, the vehicle control unit outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a second predetermined pressure threshold; the second predetermined pressure threshold is greater than the first predetermined pressure threshold;

in the case of the third cut-off mode, the vehicle control unit outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a third predetermined pressure threshold; the third predetermined pressure threshold is greater than the second predetermined pressure threshold.

7. The control device according to claim 6, wherein the vehicle control unit further has a key-off prohibition mode; when the vehicle is in the key-off prohibition mode, the vehicle control unit does not output a key-off control signal for executing a clutch key-off operation.

8. The control device according to claim 7, wherein in the key-off prohibition mode, the vehicle control unit switches to the first key-off mode upon receiving a manipulation instruction of the manipulation section.

9. The control device according to claim 7, wherein in the first cut-off mode, the vehicle control unit switches to the second cut-off mode upon receiving a manipulation instruction of the manipulation section.

10. The control device according to claim 7, characterized in that in the second cut-off mode, the vehicle control unit switches to the third cut-off mode upon receiving a manipulation instruction of the manipulation section.

11. The control device according to claim 7, characterized in that in the third shut-off mode, the vehicle control unit switches to the shut-off prohibition mode upon receiving a manipulation instruction of the manipulation section.

12. The control device according to claim 7, wherein in the first cut-off mode, the second cut-off mode, or the third cut-off mode, the vehicle control unit switches to a cut-off prohibition mode when the manipulation section accepts a pressing for a predetermined period of time.

13. The control device according to claim 1, wherein the pressure detecting unit includes a pressure sensor provided on the brake valve.

14. The control device according to claim 1, wherein the vehicle control unit is further operable to output a brake lamp turn-on signal that turns on a brake lamp when the brake pressure is greater than or equal to a preset pressure.

15. The control device of claim 14, wherein the preset pressure is less than the predetermined pressure threshold.

16. The control apparatus of claim 1, wherein the predetermined pressure threshold for at least one of the shut-off modes is adjustable.

17. The control device of claim 2, further comprising a display; the display can provide a display interface displaying a plurality of the key-off modes; the control part is used for selecting a target cut-off mode by a user.

18. A work machine, comprising: a clutch cutoff control apparatus for a working machine according to any one of claims 1 to 17.

19. The work machine of claim 18, wherein the work machine comprises a loader.

Technical Field

The application relates to the field of mechanical equipment, in particular to a clutch cut-off control device of engineering machinery and the engineering machinery.

Background

A work machine such as a wheel loader can perform a desired work by using both a running device and a working device. Such a construction machine may have a clutch cut-off function of automatically switching the clutch to a neutral state and maintaining the clutch in the neutral state based on a brake pedal operation and an output of an engine or the like.

In particular, when the front end working device is used to rapidly operate in an operating state, an accelerator pedal (accelerator pedal) is depressed, and when operating power is coupled, the operating speed is unintentionally increased, and a brake pedal is simultaneously depressed in order to slow down a driven vehicle. In this case, the transmission cutoff operation is executed to cut off the operating power, thereby improving the efficiency of the operation.

However, since the timing of the clutch cut-off is fixed in the related art, when a loading operation is performed on a sloping ground or on an automatic dump truck, if a brake pedal is stepped on, the running power may be undesirably cut off, causing a running delay phenomenon, and thus causing a driver to have an inconvenience of having to repeat the switching operation of the clutch cut-off switch.

Disclosure of Invention

In view of the shortcomings of the prior art, it is an object of the present application to provide a clutch cut-off control device for a construction machine and a construction machine, which can provide selection of different clutch cut-off intervention timings.

In order to achieve the purpose, the application provides the following technical scheme:

a clutch cutoff control device for a construction machine, comprising:

a pressure detection unit for detecting a brake pressure;

a vehicle control unit capable of receiving the brake pressure; the vehicle control unit outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a predetermined pressure threshold; wherein the vehicle control unit has a plurality of cut-off modes, different predetermined pressure thresholds being different in the cut-off modes;

a clutch control unit operatively connected to the vehicle control unit to perform a clutch cutoff action in accordance with the cutoff control signal.

As a preferred embodiment, the device also comprises a control part for receiving a user control instruction; the control part is connected with the vehicle control unit so as to input the control instruction to the vehicle control unit; and the vehicle control unit determines a current preset pressure threshold value according to the control command so as to determine a current cut-off mode.

As a preferred embodiment, the manipulation part includes a button; the vehicle control unit determines a current predetermined pressure threshold according to the push signal input by the button.

As a preferred embodiment, the control device further includes a display portion; the display part is used for displaying the current cutting-off mode.

As a preferred embodiment, the display portion includes a plurality of indicator lamps corresponding to different cut-off modes; the vehicle control unit can light an indicator lamp corresponding to a current key-off mode.

As a preferred embodiment, the plurality of cut-off modes include: a first cut-off mode, a second cut-off mode, and a third cut-off mode; wherein the content of the first and second substances,

in the case of the first cut-off mode, the vehicle control unit outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a first predetermined pressure threshold;

in the case of the second cut-off mode, the vehicle control unit outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a second predetermined pressure threshold; the second predetermined pressure threshold is greater than the first predetermined pressure threshold;

in the case of the third cut-off mode, the vehicle control unit outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a third predetermined pressure threshold; the third predetermined pressure threshold is greater than the second predetermined pressure threshold.

As a preferred embodiment, the vehicle control unit further has a key-off prohibition mode; when the vehicle is in the key-off prohibition mode, the vehicle control unit does not output a key-off control signal for executing a clutch key-off operation.

In a preferred embodiment, the vehicle control unit switches to the first cut-off mode when receiving a manipulation command from the manipulation unit while in the cut-off prohibition mode.

In a preferred embodiment, the vehicle control unit switches to the second cut-off mode when receiving a manipulation command from the manipulation unit in the first cut-off mode.

In a preferred embodiment, in the second cut-off mode, the vehicle control unit switches to the third cut-off mode when receiving a manipulation command from the manipulation unit.

In a preferred embodiment, in the third disconnection mode, the vehicle control unit switches to the disconnection prohibition mode when receiving a manipulation command from the manipulation unit.

As a preferred embodiment, in the first cut-off mode, the second cut-off mode, or the third cut-off mode, the vehicle control unit switches to a cut-off prohibition mode when the manipulation portion accepts a pressing for a predetermined period of time.

In a preferred embodiment, the pressure detection unit includes a pressure sensor provided on the brake valve.

As a preferred embodiment, the vehicle control unit may further output a brake lamp turn-on signal to turn on a brake lamp when the brake pressure is greater than or equal to a preset pressure.

In a preferred embodiment, the preset pressure is smaller than the predetermined pressure threshold.

In a preferred embodiment, the predetermined pressure threshold corresponding to at least one of the shut-off modes is adjustable.

As a preferred embodiment, the control device further comprises a display; the display can provide a display interface displaying a plurality of the key-off modes; the control part is used for selecting a target cut-off mode by a user.

A work machine comprising: the clutch cutoff control device for a construction machine according to any one of the embodiments described above.

In a preferred embodiment, the work machine comprises a loader.

Has the advantages that:

the clutch cut-off control device provided by the embodiment of the application has a plurality of cut-off modes, and the preset pressure threshold values in the different cut-off modes are different, so that different clutch intervention opportunities can be selected.

Under different cut-off modes, different preset pressure thresholds are provided for a driver, and correspondingly, the stepping amplitude of a brake pedal can be different when the driver cuts off the clutch under different cut-off modes, so that the driver can conveniently select the corresponding cut-off mode under different conditions.

The corresponding cut-off mode with the preset pressure threshold value higher can be selected when the loading and unloading operation is carried out on the slope, so that the unexpected early intervention of the cut-off of the clutch is avoided, and of course, the corresponding cut-off mode with the preset pressure threshold value can be selected according to the self requirement, so that the clutch intervenes according to the expected time.

In addition, due to the fact that a plurality of different cut-off modes exist, different drivers can switch to the cut-off mode suitable for self operation when using, and user experience is improved.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. The embodiments of the invention include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, integers, steps or components but does not preclude the presence or addition of one or more other features, integers, steps or components.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a schematic diagram of a clutch cutoff control device of a construction machine according to an embodiment of the present application.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Please refer to fig. 1. The embodiment of the present application provides a clutch cut-off control device for construction machinery, including: a pressure detection unit 300, a vehicle control unit 100, and a clutch control unit 200.

The pressure detection unit 300 is used to detect the brake pressure. The vehicle control unit 100 can receive the brake pressure. The Vehicle Control Unit (VCU)100 outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a predetermined pressure threshold value. A clutch control unit (TCU) 200 is operatively connected to the vehicle control unit 100 to perform a clutch cut-off action according to the cut-off control signal.

In the embodiment of the application, the clutch can be a hydraulic clutch for changing the speed of the loader in a plurality of speed gears. Specifically, the clutches may include a forward hydraulic clutch, a reverse hydraulic clutch, and a speed gear hydraulic clutch. Each hydraulic clutch may be engaged or disengaged by hydraulic oil (clutch hydraulic pressure) supplied from the clutch control unit 200. In other words, the hydraulic clutch may be engaged when the clutch hydraulic pressure supplied to the hydraulic clutch increases, and the hydraulic clutch is disengaged when the clutch hydraulic pressure decreases.

When a driver intends to dump a load while performing a work carrying operation, the driver depresses an accelerator pedal to quickly lift a boom of the loader and simultaneously depresses a brake pedal to slow down a vehicle speed, so that the wheel loader can perform a clutch cut-off operation for cutting off operation power. At this time, the vehicle control unit 100 outputs a control signal for executing a clutch cutoff operation to the clutch control unit 200, and the clutch control unit 200 cuts off supply of the hydraulic oil to the forward or reverse hydraulic clutch so that the clutch is shifted to a neutral state.

In the present embodiment, the vehicle control unit 100 has a plurality of key-off modes. The predetermined pressure threshold is different for different ones of the shut-off modes. The clutch cut-off control device provided by the embodiment of the application has a plurality of cut-off modes, and the preset pressure threshold values in the different cut-off modes are different, so that different clutch intervention opportunities can be selected.

Under different cut-off modes, different preset pressure thresholds are provided for a driver, and correspondingly, the stepping amplitude of a brake pedal can be different when the driver cuts off the clutch under different cut-off modes, so that the driver can conveniently select the corresponding cut-off mode under different conditions.

The corresponding cut-off mode with the preset pressure threshold value can be selected when the loading and unloading operation is carried out on the slope, so that the unexpected early intervention of the cut-off of the clutch is avoided, and of course, the corresponding cut-off mode with the preset pressure threshold value can be selected according to the self requirement, so that the clutch intervenes at the expected time.

In addition, due to the fact that a plurality of different cut-off modes exist, different drivers can switch to the cut-off mode suitable for self operation when using, and user experience is improved.

For example, in a scene of loading and unloading operation on an uphill slope, a driver can select a cut-off mode with a higher preset pressure threshold, and correspondingly, if the cut-off mode is started, the amplitude of pressing the brake pedal by the driver is larger, so that the situation that the running power is disconnected at a smaller pressing amplitude is avoided, the power cut-off control at an unexpected time point is prevented, the running delay phenomenon is conveniently eliminated, and the normal running of the machine is ensured. When the cut-off mode needs to be started, the driver can press the brake pedal greatly to enable the brake pedal to exceed the preset pressure threshold corresponding to the current cut-off mode.

Correspondingly, in the scene of loading and unloading operation in a flat ground or downhill scene, a driver can select a cut-off mode with a smaller preset pressure threshold, and the corresponding cut-off mode can be quickly started. At the moment, when the loading and unloading operation is carried out, a driver only needs to step on and press the brake pedal (compared with the last scene) to a certain extent, the cut-off mode can be started quickly, the running power is cut off, the running is prevented from being too fast, and the working efficiency is improved.

In the embodiment of the present application, the vehicle control unit 100 transmits a key-off control signal to the clutch control unit 200. The disconnection control signal may be a wireless signal or a wired signal. Specifically, the disconnection control signal may be CAN information that the Vehicle Control Unit (VCU)100 broadcasts to the CAN BUS, or may be a signal output by a pin of the vehicle control unit 100.

Both the vehicle control unit 100 and the clutch control unit 200 have CAN communication capability. The vehicle control unit 100 and the clutch control unit 200 are connected to a CAN BUS. The clutch control unit 200 may receive and execute a CAN signal representing a cut-off control signal of the vehicle control unit 100, however, it should be understood that the vehicle control unit 100 and the clutch control unit 200 may also communicate through LIN, and the communication manner of the vehicle control unit 100 and the clutch control unit 200 is not particularly limited in the embodiment of the present invention.

In another embodiment, a pin of the vehicle control unit 100 outputs a cut-off control signal, and the control signal may be a high level signal, a low level signal or other control signals. The pin is electrically connected to the clutch control unit 200. The clutch control unit 200 may receive and execute an electric signal representing a cut-off control signal of the vehicle control unit 100.

In a preferred embodiment, the clutch cutoff control apparatus of the construction machine may further include a manipulation unit 400 for receiving a user manipulation command. The manipulation unit 400 is connected to the vehicle control unit 100 so as to be able to input the manipulation instruction to the vehicle control unit 100. The vehicle control unit 100 determines a current predetermined pressure threshold value according to the manipulation instruction to determine a current key-off mode.

The control unit 400 can accept user's control, and the form of the user's input control command includes but is not limited to: pressing action, knob action, voice control, or gesture control. Specifically, the manipulation part 400 may include a button. The vehicle control unit 100 determines a current predetermined pressure threshold value according to the push signal input from the button. The user realizes the input of the control signal by pressing the button.

The clutch cutoff control device for a construction machine may further include a display unit. The display part is used for displaying the current cutting-off mode. Through the display part, the driving can confirm the current cutting-off mode according to the display information of the display part, thereby determining whether the current operation is in place and accurate.

The display part and the manipulation part 400 may be cooperated with each other, the driver selects the cut-off mode through the manipulation part 400, and the display part displays the current cut-off mode so that the driver determines whether the target mode is selected. The display part may emit a display signal corresponding to the current cut-off mode, wherein the display signal may be an optical signal, for example, an indicator light signal. Of course, the display signal may also be display information of a display screen, and the current cutting-off mode is displayed by displaying corresponding text or image information. The display part and the manipulation part 400 may be disposed in the same manipulation module, facilitating manipulation and observation by the user.

In this embodiment, the display portion includes a plurality of indicator lamps corresponding to different cut-off modes. The indicator light includes, but is not limited to, an LED light. The number of indicator lights may be the same as the number of key-off modes. Also, a plurality of indicator lamps may be in one-to-one correspondence with a plurality of cut-off modes. The vehicle control unit 100 can light an indicator lamp corresponding to the current key-off mode. Correspondingly, the vehicle controller can also extinguish the indicator lamp which does not correspond to the current cut-off mode, so that the user can determine the current cut-off mode, confusion is avoided, and the accuracy of user operation is ensured.

In another preferred embodiment, the clutch cut-off control device of the construction machine may further include a display. The display can provide a display interface displaying a plurality of the key-off modes. The manipulation unit 400 is used for a user (e.g., a driver) to select a target key-off mode. The display interface can be hidden or called out for display, and the target cut-off mode can be selected by the driver when the display interface is called out. All the cutting-off modes can be collectively displayed in the display interface, and of course, the cutting-off prohibition mode can also be displayed in the display interface for the user to select. The control unit 400 may be a physical button, and the user presses the physical button to select the target cut-off mode.

In other embodiments, the control unit 400 may also be a touch panel integrated on a display, and the touch panel integrates the touch unit and the display, so as to improve the integration of the device and facilitate the user to view and control the device.

Of course, the method is not limited to the one-to-one correspondence mode, and only different indication signals are sent in different cutting modes, so that a driver can know the current cutting mode according to the indication signals to determine whether the operation is in place and accurate.

In the embodiment of the present application, the vehicle control unit 100 is electrically connected to the stop lamp 500. The vehicle control unit 100 may further output a brake lamp on signal to turn on the brake lamp 500 when the brake pressure is greater than or equal to a preset pressure. Wherein the preset pressure is less than the preset pressure threshold. Thus, the brake lamp (brake lamp) 500 can be turned on at the initial stage of braking to turn on the warning function. When the brake pressure is less than the preset pressure, the vehicle control unit 100 turns off the brake lamp 500.

The vehicle control unit 100 can simultaneously control the stop lamp 500 and the clutch to be switched off according to the pressure sensors, only one pressure sensor is needed to detect the brake pressure, the mechanical microswitch and the pressure switch are not needed to realize the function of switching off the stop lamp 500 and the clutch, and the cost can be effectively reduced.

In a specific embodiment, the pressure detecting unit 300 includes a pressure sensor provided on the brake valve. Therefore, the material cost can be effectively reduced, and the number of mechanical micro switches and pressure switches can be reduced. According to the embodiment, the pressure sensor can replace a pressure switch, the brake lamp 500 and the clutch cut-off function are realized simultaneously, and the cost can be effectively saved.

In this embodiment, a pressure sensor may be assembled to the brake valve to monitor brake line pressure to obtain brake pressure. The pressure sensor may output a different voltage depending on the change in the brake oil pressure. For example, the pressure sensor may output a voltage signal of 0.25V to 4.75V according to a difference in brake pressure. The relationship between the brake pressure and the output voltage of the pressure sensor may be previously set in the vehicle control unit 100 so that the vehicle control unit 100 determines whether the brake pressure exceeds a predetermined pressure threshold or a preset pressure according to the output voltage signal of the pressure sensor, thereby determining whether to activate the cut-off mode and the brake lamp 500.

In this embodiment, different predetermined pressure thresholds may be provided in the vehicle control unit 100 in advance, and the pressure signal of the pressure sensor is compared with the pressure signal when acquired, and the corresponding shut-off mode is decided to be activated. Accordingly, a preset pressure (value) may also be predefined in the vehicle controller as a trigger condition for activating the brake lamp 500.

In a possible embodiment, the predetermined pressure threshold for at least one of said shut-off modes is adjustable. The preset pressure threshold value can be adjusted by the driver according to the used scene or the experience of the driver, so that the customizability of the equipment can be improved, and the requirements of different drivers or using scenes can be met.

Specifically, different reference values corresponding to different cut-off modes are set in the vehicle control unit 100. The clutch cutoff control apparatus may further be provided with an input portion for a user to set an adjustment value. The input unit may be the touch screen, or may be other components, such as input keys. The vehicle control unit 100 may add or subtract the adjustment value to or from the reference value, and determine it as the predetermined pressure threshold value of the shut-off mode corresponding to the reference value. In the case of a zero adjustment value, the reference value is the predetermined pressure threshold.

In this embodiment, the input unit may be a display, and an interface (for example, a touch-sensitive display interface) may be provided on a display menu of the display for a user to change the adjustment value, so as to increase or decrease the predetermined pressure threshold corresponding to the target cut-off mode, thereby meeting the work requirement.

In a specific embodiment, the plurality of cut-off modes includes: a first cut-off mode, a second cut-off mode and a third cut-off mode.

Wherein, in the case of the first cut-off mode, the vehicle control unit 100 outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a first predetermined pressure threshold value.

In the case of the second cut-off mode, the vehicle control unit 100 outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a second predetermined pressure threshold value; the second predetermined pressure threshold is greater than the first predetermined pressure threshold.

In the case of the third cut-off mode, the vehicle control unit 100 outputs a cut-off control signal that performs a clutch cut-off action when the brake pressure is greater than a third predetermined pressure threshold value; the third predetermined pressure threshold is greater than the second predetermined pressure threshold.

The predetermined pressure thresholds of the first, second and third cut-off modes are gradually increased, and accordingly, the magnitude of the depression of the brake pedal by the driver needs to be gradually increased.

In the present embodiment, the vehicle control unit 100 may also have a key-off prohibition mode. When the vehicle control unit 100 is in the key-off prohibition mode, the key-off control signal for executing the clutch key-off operation is not output.

The first cutting-off mode, the second cutting-off mode, the third cutting-off mode and the cutting-off prohibition mode can be mutually switched, wherein the modes can be sequentially switched according to a preset sequence, and any two modes can be directly switched.

In a specific embodiment, in the key-off prohibition mode, the vehicle control unit 100 switches to the first key-off mode when receiving a manipulation instruction from the manipulation unit 400.

In the key-off prohibition mode, the manipulation command of the manipulation unit 400 may be a pressing command, and the first key-off mode can be activated only by pressing a button. The operation action can be long pressing of the button or short pressing of the button. It should be noted that, depending on the operation unit 400, the corresponding operation command may be different, and the present application is not limited to the pressing command.

Preferably, the manipulation instruction of the manipulation part 400 may be a short button press, for example, a button press time does not exceed a predetermined time (for example, 5 seconds, 3 seconds, or the like), the starting operation is simple, the successful starting can be ensured, the increase of the operation intensity caused by the long button press can be avoided, and the conflict with other starting operations can be avoided.

Accordingly, in this embodiment, the switching sequence between the first cut-off mode and the other cut-off modes (the second cut-off mode or the third cut-off mode) is not limited, and the three modes may be switched sequentially, or the first cut-off mode may be directly switched to the second cut-off mode, or may be directly switched to the third cut-off mode.

Of course, in other embodiments, the vehicle control unit 100 may switch to another shut-off mode, such as the second shut-off mode or the third shut-off mode, when receiving the manipulation command from the manipulation unit 400 while in the shut-off prohibition mode, which is not limited in this application.

In another specific embodiment, in the first cut-off mode, the vehicle control unit 100 switches to the second cut-off mode when receiving a manipulation instruction from the manipulation unit 400.

In the first cut-off mode, the operation command of the operation unit 400 may be a press command, and the second cut-off mode can be activated only by pressing a button. The operation action can be long pressing of the button or short pressing of the button. It should be noted that, depending on the operation unit 400, the corresponding operation command may be different, and the present application is not limited to the pressing command.

Preferably, the manipulation instruction of the manipulation part 400 may be a short button press, for example, a button press time does not exceed a predetermined time (for example, 5 seconds, 3 seconds, or the like), the starting operation is simple, the successful starting can be ensured, the increase of the operation intensity caused by the long button press can be avoided, and the conflict with other starting operations can be avoided.

Accordingly, in the present embodiment, the first cut-off mode and the second cut-off mode have a corresponding switching sequence, but the switching sequence between the second cut-off mode and the other cut-off mode (the first cut-off mode or the third cut-off mode) is not limited, and the three can be switched sequentially, or the second cut-off mode can be directly switched to the third cut-off mode, or can be directly switched to the first cut-off mode, or even directly switched to the cut-off prohibition control mode.

Of course, in other embodiments, in the first cut-off mode, the vehicle control unit 100 may also switch to another cut-off mode, such as a third cut-off mode, or even prohibit the cut-off mode when receiving the manipulation instruction of the manipulation part 400, and the present application is not limited thereto.

In another specific embodiment, in the second cut-off mode, the vehicle control unit 100 switches to the third cut-off mode when receiving a manipulation instruction from the manipulation unit 400.

In the second cut-off mode, the manipulation command of the manipulation unit 400 may be a press command, and the third cut-off mode can be activated only by pressing a button. The operation action can be long pressing of the button or short pressing of the button. It should be noted that, depending on the operation unit 400, the corresponding operation command may be different, and the present application is not limited to the pressing command.

Preferably, the manipulation instruction of the manipulation part 400 may be a short button press, for example, a button press time does not exceed a predetermined time (for example, 5 seconds, 3 seconds, or the like), the starting operation is simple, the successful starting can be ensured, the increase of the operation intensity caused by the long button press can be avoided, and the conflict with other starting operations can be avoided.

Accordingly, in the present embodiment, the second cut-off mode and the third cut-off mode have a corresponding switching sequence, but the switching sequence between the third cut-off mode and the other cut-off modes (the first cut-off mode or the cut-off prohibition mode) is not limited, and the three cut-off modes may be switched sequentially, or the third cut-off mode may be directly switched to the first cut-off mode, may be directly switched to the second cut-off mode, and may even be directly switched to the cut-off prohibition control mode.

Of course, in other embodiments, in the second cut-off mode, the vehicle control unit 100 may also switch to another cut-off mode, such as the first cut-off mode, or even disable the cut-off mode, when receiving the manipulation instruction of the manipulation unit 400, and the application is not limited thereto.

In another specific embodiment, in the third disconnection mode, the vehicle control unit 100 switches to the disconnection prohibition mode when receiving a manipulation instruction from the manipulation unit 400.

In the third cut-off mode, the manipulation command of the manipulation unit 400 may be a press command, and the cut-off prohibition mode can be activated only by pressing a button. The operation action can be long pressing of the button or short pressing of the button. It should be noted that, depending on the operation unit 400, the corresponding operation command may be different, and the present application is not limited to the pressing command.

Preferably, the manipulation instruction of the manipulation part 400 may be a short button press, for example, a button press time does not exceed a predetermined time (for example, 5 seconds, 3 seconds, or the like), the starting operation is simple, the successful starting can be ensured, the increase of the operation intensity caused by the long button press can be avoided, and the conflict with other starting operations can be avoided.

Accordingly, in the present embodiment, the third cut-off mode and the cut-off prohibition mode have a corresponding switching sequence, but the switching sequence between the cut-off prohibition mode and the other cut-off modes (the first cut-off mode or the second cut-off mode) is not limited, and the four modes may be switched in a sequential cycle, or the cut-off prohibition mode may be directly switched to the first cut-off mode or directly switched to the second cut-off mode.

Of course, in other embodiments, in the third disconnection mode, the vehicle control unit 100 may also switch to other disconnection modes, such as the first disconnection mode and even the second disconnection mode, when receiving the manipulation instruction of the manipulation unit 400, and the application is not limited thereto. And the starting of the cut-off prohibition mode can adopt a manipulation instruction different from the switching of the cut-off mode.

In the first or second or third key-off mode, the vehicle control unit 100 switches to a key-off prohibition mode when the manipulation portion 400 accepts a press for a predetermined period of time, for the convenience of the driver's operation. Therefore, the driver can conveniently control the switching device, the driver can switch to the cutting-off prohibition mode by long-pressing the button in any cutting-off mode, the user does not need to switch the cutting-off modes in sequence, and convenience and rapidness are realized. Wherein the predetermined length of time of pressing is a long press button, illustrative examples being: the predetermined time period may be more than 3 seconds, or may be flexibly specified according to a usage scenario, and the present application is not limited thereto.

In a preferred embodiment, the key-off prohibition mode, the first key-off mode, the second key-off mode, and the third key-off mode may be switched cyclically in sequence. By pressing the button 3 seconds or less once, the driver can switch the loader from the key-off prohibition mode to the first key-off mode, from the first key-off mode to the second key-off mode, from the second key-off mode to the third key-off mode, and from the third key-off mode to the key-off prohibition mode.

In the present embodiment, when the loader is in any one of the first shut-off mode, the second shut-off mode, and the third shut-off mode, the driver can also directly switch the loader to the shut-off prohibition mode by pressing the button for 3 seconds or more at a single time.

In the present embodiment, three indicator lights (e.g., LED lights) are located in the cab and correspond one-to-one to the first, second, and third cut-off modes. When in the key-off prohibition mode, all three indicator lights are turned off. Accordingly, in any one of the first cut-off mode, the second cut-off mode, and the third cut-off mode, the corresponding indicator lamp is turned on. The driver can be reminded of the current cut-off mode or the cut-off prohibition mode, so that the loader can be more accurately operated.

The embodiment of the present application further provides an engineering machine, including: the clutch cutoff control device for a construction machine according to any one of the above embodiments or examples. Specifically, the working machine comprises a loader. Of course, the engineering machine may also be a forklift, an excavator, or other equipment, and the application is not limited to a loader as a single unit.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of subject matter that is disclosed herein is not intended to forego such subject matter, nor should the inventors be construed as having contemplated such subject matter as being part of the disclosed subject matter.