Loader control circuit, circuit board assembly, loader, and control method

Abstract

The application discloses a loader control circuit, a circuit board assembly, a loader and a control method, which comprise a handle control module, a whole machine control module, a bucket hydraulic control module, a gearbox and a travel control module, the handle control module is electrically connected with the whole machine control module, and the whole machine control module is respectively electrically connected with the bucket hydraulic control module, the gearbox and the travel control module.In the technical scheme of the application, the handle control module is electrically connected with the bucket hydraulic control module, the gearbox and the travel control module through the whole machine control module, the whole machine control module can identify the signal transmitted by the handle control module, and can judge whether the driver has an incorrect operation according to the current motion state of the loader; when the signal accepted by the whole machine control module does not match the motion state of the loader, the whole machine control module will not execute the instruction transmitted by the handle control module, so that damage of the gearbox or other control devices caused by incorrect touch of the driver can be avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of loaders, in particular to a loader control circuit, a circuit board assembly, a loader and a control method. BACKGROUND

[0002] The loader driver usually controls the loader operation handle to control the forward and backward of the loader, however, due to the traditional loader control system, the operation handle lacks the mis-touch protection for the loader movement control, which leads to the misoperation of the driver operating the operation handle, such as when the loader is in the forward state, the driver mis-touches the backward button, which causes the loader to immediately enter the backward state, and in the long run, it may cause damage to the loader gearbox, affecting the normal use of the loader. SUMMARY

[0003] The main purpose of the present application is to provide a loader control circuit, a circuit board assembly, a loader and a control method, which aims to provide a mis-touch prevention loader control system.

[0004] To achieve the above purpose, the loader control circuit provided by the present application comprises a handle control module, a whole machine control module, a bucket hydraulic control module, a gearbox and a travel control module.

[0005] The handle control module is electrically connected with the whole machine control module, and the whole machine control module is respectively electrically connected with the bucket hydraulic control module, the gearbox and the travel control module.

[0006] The handle control module is used to identify the operator's instruction and make the whole machine control module generate different electrical signals.

[0007] The bucket hydraulic control module is used to control the movement of the loader bucket.

[0008] The travel control module is used to control the forward, stop and backward of the loader.

[0009] The gearbox is used to control the lifting gear of the loader.

[0010] The whole machine control module is used to control the working of the bucket hydraulic control module, the gearbox and the travel control module.

[0011] Optionally, the whole machine control module has a first signal output end, a second signal output end, a third signal output end, a fourth signal output end and a signal input end.

[0012] The handle control module comprises a traveling unit, a bucket control unit and a gear control unit, one end of the traveling unit is connected with the signal input end of the whole machine control module, the other end is connected with the first signal output end and the second signal output end of the whole machine control module respectively, one end of the gear control unit is connected with the signal input end of the whole machine control module, the other end is connected with the third signal output end and the fourth signal output end of the whole machine control module respectively, one end of the bucket control unit is connected with the input power supply, the other end is connected with the signal input end of the whole machine control module and the ground respectively, the traveling unit, the bucket control unit and the gear control unit are connected in parallel with each other.

[0013] The traveling unit is used to receive the first electric signal and the second electric signal output from the first signal output end and the second signal output end of the whole machine control module, and transmit the first electric signal and the second electric signal to the whole machine control module through the signal input end of the whole machine control module.

[0014] The gear control unit is used to receive the third electric signal and the fourth electric signal output from the third signal output end and the fourth signal output end of the whole machine control module, and transmit the third electric signal and the fourth electric signal to the whole machine control module through the signal input end of the whole machine control module.

[0015] The bucket control unit is used to receive the power supply signal transmitted from the input power supply, and convert the power supply signal into the fifth electric signal, and transmit the fifth electric signal to the whole machine control module through the signal input end of the whole machine control module.

[0016] Optionally, the traveling unit comprises a first control switch and a second control switch.

[0017] One end of the first control switch is connected with the first signal output end of the whole machine control module, and the other end is connected with the signal input end of the whole machine control module.

[0018] One end of the second control switch is connected with the second signal output end of the whole machine control module, and the other end is connected with the signal input end of the whole machine control module.

[0019] The first control switch and the second control switch are connected in parallel with each other.

[0020] The first electric signal is a forward signal of the loader, and the second electric signal is a backward signal of the loader.

[0021] Optionally, the gear control unit comprises a third control switch and a fourth control switch.

[0022] One end of the third control switch is connected with the third signal output end of the whole machine control module, and the other end is connected with the signal input end of the whole machine control module;

[0023] One end of the fourth control switch is connected with the fourth signal output end of the whole machine control module, and the other end is connected with the signal input end of the whole machine control module;

[0024] The third control switch and the fourth control switch are connected in parallel.

[0025] The third control switch and the fourth control switch are connected in parallel.

[0026] Optionally, the bucket control unit comprises a first sliding rheostat and a second sliding rheostat.

[0027] One end of the first sliding rheostat is connected with an input power supply, and the other end is connected with the second sliding rheostat.

[0028] One end of the second sliding rheostat is connected with the first sliding rheostat, and the other end is connected with the signal input end of the whole machine control module and the ground respectively.

[0029] The application further provides a circuit board assembly, which comprises a loader control circuit, and the loader control circuit comprises a handle control module, a whole machine control module, a bucket hydraulic control module, a gearbox and a travel control module.

[0030] The handle control module is electrically connected with the whole machine control module, and the whole machine control module is electrically connected with the bucket hydraulic control module, the gearbox and the travel control module respectively.

[0031] The handle control module is used for identifying an operator instruction and making the whole machine control module generate different electric signals.

[0032] The bucket hydraulic control module is used for controlling the movement of a loader bucket.

[0033] The travel control module is used for controlling the forward movement, stopping and backward movement of a loader.

[0034] The gearbox is used for controlling the gear lifting of a loader.

[0035] The whole machine control module is used for controlling the working of the bucket hydraulic control module, the gearbox and the travel control module.

[0036] The application further provides a loader, which comprises a circuit board assembly, wherein the circuit board assembly comprises a loader control circuit, and the loader control circuit comprises a handle control module, a whole machine control module, a bucket hydraulic control module, a gearbox and a travel control module.

[0037] The handle control module is electrically connected with the whole machine control module, and the whole machine control module is electrically connected with the bucket hydraulic control module, the gearbox and the travel control module respectively.

[0038] The handle control module is used to identify the operator's instruction and make the whole machine control module generate different electric signals.

[0039] The bucket hydraulic control module is used to control the movement of the loader bucket.

[0040] The travel control module is used to control the forward movement, stop and backward movement of the loader.

[0041] The gearbox is used to control the lifting gear of the loader.

[0042] The whole machine control module is used to control the working of the bucket hydraulic control module, the gearbox and the travel control module.

[0043] The application further provides a control method of the loader, which comprises the following steps.

[0044] Obtaining the handle state and the vehicle travel state.

[0045] According to the obtained handle state and vehicle travel state, determining a gear adjustment strategy.

[0046] According to the gear adjustment strategy, determining the action parameters of the motor and the gearbox.

[0047] According to the action parameters, controlling the movement of the loader.

[0048] In the technical scheme, the handle control module is electrically connected with the bucket hydraulic control module, the gearbox and the travel control module through the whole machine control module, the whole machine control module can identify the signals transmitted by the handle control module, and can judge whether the driver has misoperation according to the current movement state of the loader; when the signals accepted by the whole machine control module do not match the movement state of the loader, the whole machine control module will not execute the instructions transmitted by the handle control module, and the driver is reminded of the misoperation, so as to avoid the damage of the gearbox or other control devices caused by the misoperation of the driver. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only show some of the embodiments of the present application, and all of the other drawings obtained by those of ordinary skill in the art based on these drawings without creative effort are within the protection scope of the present application.

[0050] Figure 1 The circuit module connection diagram of an embodiment of the loader control circuit provided by the present application;

[0051] Figure 2 The control circuit diagram of the operation handle in the embodiment of the present application; Figure 1

[0052] The three-dimensional structure diagram of an embodiment of the operation handle provided by the present application; Figure 3

[0053] The flowchart of the first embodiment of the control method of the loader provided by the present application. Figure 4 Explanation of reference numerals:

[0054]

[0055]

[0056] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0057] DETAILED DESCRIPTION The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present application.

[0058] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications will also change accordingly.

[0059] It should be noted that all the directionality indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative position relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directionality indications will also change accordingly.

[0060] In addition, the description related to "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implying the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0061] The loader driver usually controls the loader operation handle to control the forward and reverse movement of the loader, however, due to the conventional loader control system, the operation handle lacks mis-touch protection for the loader movement control, which leads to the misoperation of the driver operating the operation handle, such as when the loader is in the forward state, the driver mis-touches the reverse button, which causes the loader to immediately enter the reverse state, which may damage the transmission case of the loader over a long period of time, affecting the normal use of the loader.

[0062] To solve the above problems, the present application provides a loader control circuit, a circuit board assembly and a loader, aiming to provide a mis-touch prevention loader control system, wherein, Figure 1 The circuit module connection schematic diagram of an embodiment of the loader control circuit provided by the present application, Figure 1 For Figure 1 The control circuit diagram of the operation handle.

[0063] Please refer to Figure 1 The loader control circuit includes a handle control module 4, a whole machine control module 5, a bucket hydraulic control module, a transmission case and a travel control module, the handle control module 4 is electrically connected with the whole machine control module 5, the whole machine control module 5 is respectively electrically connected with the bucket hydraulic control module, the transmission case and the travel control module, the handle control module 4 is used to identify the operator's instruction and make the whole machine control module 5 generate different electrical signals, the bucket hydraulic control module is used to control the movement of the loader bucket, the travel control module is used to control the forward, stop and reverse movement of the loader, the transmission case is used to control the lifting gear of the loader, and the whole machine control module 5 is used to control the working of the bucket hydraulic control module, the transmission case and the travel control module.

[0064] The handle control module 4 is electrically connected with the bucket hydraulic control module, the gearbox and the traveling control module through the whole machine control module 5, the whole machine control module 5 can identify the signal transmitted by the handle control module 4, and according to the current motion state of the loader, it is judged whether the driver has misoperation, when the signal received by the whole machine control module 5 is not consistent with the motion state of the loader, the whole machine control module 5 will not execute the instruction transmitted by the handle control module 4, and the driver is reminded of the misoperation, so as to avoid damage of the gearbox or other control devices due to the misoperation of the driver.

[0065] In order to transmit the operation of the operator on the operation handle 1000 to the whole machine control module 5, please refer to Figure 2 In an embodiment of the present application, the whole machine control module 5 has a first signal output end 51, a second signal output end 52, a third signal output end 53, a fourth signal output end 54 and a signal input end 55, the handle control module 4 includes a traveling unit 41, a bucket control unit 42 and a gear control unit 43, one end of the traveling unit 41 is connected with the signal input end 55 of the whole machine control module 5, the other end is connected with the first signal output end 51 and the second signal output end 52 of the whole machine control module 5 respectively, one end of the gear control unit 43 is connected with the signal input end 55 of the whole machine control module 5, the other end is connected with the third signal output end 53 and the fourth signal output end 54 of the whole machine control module 5 respectively, one end of the bucket control unit 42 is connected with the input power supply 56, the other end is connected with the signal input end 55 of the whole machine control module 5 and the ground respectively, the traveling unit 41, the bucket control unit 42 and the gear control unit 43 are connected with each other in parallel, the traveling unit 41 is used to receive the first electric signal and the second electric signal output from the first signal output end 51 and the second signal output end 52 of the whole machine control module 5, and transmit the first electric signal and the second electric signal to the whole machine control module 5 through the signal input end 55 of the whole machine control module 5, the gear control unit 43 is used to receive the third electric signal and the fourth electric signal output from the third signal output end 53 and the fourth signal output end 54 of the whole machine control module 5, and transmit the third electric signal and the fourth electric signal to the whole machine control module 5 through the signal input end 55 of the whole machine control module 5, the bucket control unit 42 is used to receive the power supply signal transmitted from the input power supply 56, and convert the power supply signal into the fifth electric signal, and transmit the fifth electric signal to the whole machine control module 5 through the signal input end 55 of the whole machine control module 5, so as to transmit the operation of the operator on the operation handle 1000 to the whole machine control module 5, and realize the control of the loader by the handle control unit.

[0066] Further, the traveling unit 41 comprises a first control switch 411 and a second control switch 412, one end of the first control switch 411 is connected with the first signal output end 51 of the whole machine control module 5, the other end is connected with the signal input end 55 of the whole machine control module 5, one end of the second control switch 412 is connected with the second signal output end 52 of the whole machine control module 5, the other end is connected with the signal input end 55 of the whole machine control module 5, the first control switch 411 and the second control switch 412 are parallel to each other, wherein the first electric signal is a forward signal of the loader, the second electric signal is a backward signal of the loader.

[0067] In the specific operation process, the first control switch 411 and the second control switch 412 are in the open state, at this time the loader is in neutral, that is, in N gear state, when the operator presses the first control switch 411, the first signal output end 51 of the whole machine control module 5 forms a communication loop with the input end of the whole machine control module 5, the first signal output end 51 of the whole machine control module 5 inputs the first electric signal to the input end of the whole machine control module 5, the whole machine control module 5 receiving the first electric signal will control the forward movement of the loader, that is, in D gear, and when the operator presses the second control switch 412, the second signal output end 52 of the whole machine control module 5 forms a communication loop with the input end of the whole machine control module 5, the second signal output end 52 of the whole machine control module 5 inputs the second electric signal to the input end of the whole machine control module 5, the whole machine control module 5 receiving the second electric signal will control the backward movement of the loader, that is, in R gear.

[0068] The gear control unit 43 comprises a third control switch 431 and a fourth control switch 432, one end of the third control switch 431 is connected with the third signal output end 53 of the whole machine control module 5, the other end is connected with the signal input end 55 of the whole machine control module 5, one end of the fourth control switch 432 is connected with the fourth signal output end 54 of the whole machine control module 5, the other end is connected with the signal input end 55 of the whole machine control module 5, the third control switch 431 and the fourth control switch 432 are parallel, wherein the third electric signal is a gear up signal of the gearbox, the fourth electric signal is a gear down signal of the gearbox.

[0069] In the actual operation process, the third control switch 431 and the fourth control switch 432 are in the open state, when the operator presses the third control switch 431, the third signal output end 53 of the whole machine control module 5 and the input end of the whole machine control module 5 form a communication loop, the third signal output end 53 of the whole machine control module 5 inputs the third electric signal to the input end of the whole machine control module 5, and the whole machine control module 5 receiving the third electric signal will send an electric signal to the gearbox to control the gearbox to upshift. When the operator presses the fourth control switch 432, the fourth signal output end 54 of the whole machine control module 5 and the input end of the whole machine control module 5 form a communication loop, the fourth signal output end 54 of the whole machine control module 5 inputs the fourth electric signal to the input end of the whole machine control module 5, and the whole machine control module 5 receiving the third electric signal will send an electric signal to the gearbox to control the gearbox to downshift.

[0070] The shovel control unit 42 includes a first sliding resistor 421 and a second sliding resistor 422, one end of the first sliding resistor 421 is connected with the input power supply 56, the other end is connected with the input power supply 56, and the other end is connected with the second sliding resistor 422, one end of the second sliding resistor 422 is connected with the first sliding resistor 421, and the other end is connected with the signal input end 55 of the whole machine control module 5 and the ground respectively.

[0071] In the actual operation process, the gearbox 1 includes a shovel lifting slide and a shovel rotating slide, the first sliding resistor is arranged in the shovel lifting slide, the second sliding resistor 422 is arranged in the second lifting slide, and the handle rod 22 of the operation handle 1000 is slidingly arranged on the first sliding resistor 421 and the second sliding resistor 422, so that the resistance of the first sliding resistor 421 and the second sliding resistor 422 is changed by the sliding of the handle rod 22 on the first sliding resistor 421 and the second sliding resistor 422, and when the resistance of the first sliding resistor 421 and the second sliding resistor 422 changes, the current of the input power supply 56 to the signal input end 55 of the whole machine control module 5 also changes.

[0072] When the handle rod 22 slides on the first slide rheostat 421, the second slide rheostat 422 is in an open circuit state, the whole machine control module 5 can judge the intention of the driver for the bucket lifting according to the change of the input current size, judge the demand of the driver for the fast and slow of the bucket lifting according to the fast and slow of the change of the input current, for example, when the driver pushes the handle rod 22 along the bucket lifting slide in the positive direction, the resistance of the first slide rheostat 421 increases, the current decreases, and the loader bucket moves upward, when the driver pushes the handle rod 22 along the bucket lifting slide in the reverse direction, the resistance of the first slide rheostat 421 decreases, the current increases, and the loader bucket moves downward.

[0073] When the handle rod 22 slides on the second slide rheostat 422, at this time the resistance of the first slide rheostat 421 is full resistance, that is, at this time the first slide rheostat 421 can be regarded as a resistance with constant resistance, at this time the whole machine control module 5 can judge the intention of the driver for the bucket rotation according to the change of the input current size, judge the demand of the driver for the fast and slow of the bucket rotation according to the fast and slow of the change of the input current. Further, the input voltage of the input power supply 56 is 5V.

[0074] The application further provides a circuit board assembly, which comprises the loader control circuit, and the specific structure of the loader control circuit is referred to the above-mentioned embodiments. Since all the technical solutions of the above-mentioned embodiments are adopted in the circuit board assembly, all the beneficial effects brought by the technical solutions of the above-mentioned embodiments are at least possessed by the circuit board assembly, which will not be repeated here.

[0075] The application further provides a loader, which comprises the circuit board assembly, and the circuit board assembly comprises the loader control circuit, and the specific structure of the loader control circuit is referred to the above-mentioned embodiments. Since all the technical solutions of the above-mentioned embodiments are adopted in the circuit board assembly, all the beneficial effects brought by the technical solutions of the above-mentioned embodiments are at least possessed by the circuit board assembly, which will not be repeated here.

[0076] The loader further comprises a control handle 1000, the control handle 1000 comprises a shift box 1, a handle, a position sensor and a button panel 3, the handle comprises a handle head 21 and a handle rod 22, the handle head 21 is formed with a panel mounting groove, the handle rod 22 is movably arranged in the shift box 1, the position sensor is arranged in the shift box 1 and electrically connected with the circuit board assembly, the position sensor is used for detecting the position change of the handle rod 22 in the shift box 1, and the button panel 3 is arranged in the panel mounting groove and electrically connected with the circuit board assembly.

[0077] The position sensor can have various forms, in an embodiment of the present application, the position sensor can be a Hall element distributed in the gear box 1, the Hall element is used to detect the movement of the handle rod 22 in the gear box 1, the position sensor can also be a sliding rheostat and a brush arranged on the handle rod 22, the movement of the handle rod 22 is used to change the resistance of the sliding rheostat, and the present application does not limit this.

[0078] Further, referring to Figure 3 The button panel 3 includes a button assembly for controlling the gear lifting of the loader gearbox, the button assembly includes a gear up button 31 and a gear down button 32, the gear up button 31 and the gear down button 32 correspond to the third control switch 431 and the fourth control switch 432 respectively, so as to control the gear up and gear down of the loader, the button panel 3 includes a rocker button 33, the two ends of the rocker button 33 correspond to the first control switch 411 and the second control switch 412 respectively, so as to control the forward and reverse of the loader, when the rocker button 33 is in the middle position, the loader is in the neutral state.

[0079] The present application also provides a control method of a loader, Figure 4 The flowchart of the first embodiment of the control method of the loader provided by the present application, the control method of the loader, includes the following steps:

[0080] S1, obtaining the handle state and the vehicle driving state;

[0081] It should be explained that the handle state includes the position change of the handle in the gear box and the pressing condition of the handle button, the system can judge the gear engagement intention of the driver according to the position change of the handle in the gear box, and can judge the gear up and down intention of the driver according to the pressing condition of the handle button.

[0082] S2, determining the gear adjustment strategy according to the obtained handle state and vehicle driving state;

[0083] It should be explained that the gear adjustment strategy means that the system will query the handle state and the corresponding mapping of the system according to the handle state to identify the operation instruction of the driver, and will judge whether the driver has a misoperation according to the identified operation instruction of the driver and the vehicle driving state, for example, when the vehicle driving state shows forward and the handle state shows R gear, i.e., reverse gear, the system will judge that the driver has a misoperation and will not execute the vehicle reversing instruction, only when the vehicle driving state and the operation instruction of the driver are consistent with the logic, such as when the vehicle is in the driving state and the driver changes the gear position of the vehicle from forward to neutral, the system will operate according to the operation instruction of the driver.

[0084] S3, determining an action parameter of the motor and the gearbox according to the gear adjustment strategy;

[0085] S4, controlling the movement of the loader according to the action parameter.

[0086] In the above embodiment, the system can determine the driving intention of the driver according to the obtained handle state, that is, whether the driver needs the vehicle to move forward or backward, or to increase or decrease the gear, and then the system compares the obtained driving intention of the driver with the vehicle movement state to determine whether the driving intention of the driver and the vehicle movement state are consistent, and further determines the gear adjustment strategy. Only when it is determined that the driving intention of the driver and the vehicle movement state are consistent, the system will change the action parameter of the motor and the gearbox according to the driving intention of the driver, and then control the loader to make corresponding movement. In this way, the damage to the gearbox and the motor caused by the misoperation of the driver can be prevented.

[0087] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation made under the inventive concept of the present application, using the content of the specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A loader control circuit, characterized in that The handle control module, the whole machine control module, the bucket hydraulic control module, the gearbox and the travel control module are included. The handle control module is electrically connected with the whole machine control module, and the whole machine control module is electrically connected with the bucket hydraulic control module, the gearbox and the travel control module respectively. The handle control module is used to identify the operator's instruction and make the whole machine control module generate different electric signals. The bucket hydraulic control module is used to control the loader bucket movement. The travel control module is used to control the loader forward, stop and backward. The gearbox is used to control the loader lifting gear. The whole machine control module is used to control the bucket hydraulic control module, the gearbox and the travel control module work. The whole machine control module has a first signal output end, a second signal output end, a third signal output end, a fourth signal output end and a signal input end. The handle control module includes a travel unit, a bucket control unit and a gear control unit, one end of the travel unit is connected with the signal input end of the whole machine control module, the other end is connected with the first signal output end and the second signal output end of the whole machine control module respectively, one end of the gear control unit is connected with the signal input end of the whole machine control module, the other end is connected with the third signal output end and the fourth signal output end of the whole machine control module respectively, one end of the bucket control unit is connected with the input power supply, the other end is connected with the signal input end of the whole machine control module and the ground respectively, the travel unit, the bucket control unit and the gear control unit are connected with each other in parallel. The travel unit is used to receive the first electric signal and the second electric signal output from the first signal output end and the second signal output end of the whole machine control module, and transmit the first electric signal and the second electric signal to the whole machine control module through the signal input end of the whole machine control module. The gear control unit is used to receive the third electric signal and the fourth electric signal output from the third signal output end and the fourth signal output end of the whole machine control module, and transmit the third electric signal and the fourth electric signal to the whole machine control module through the signal input end of the whole machine control module. The bucket control unit is used to receive the power supply signal transmitted from the input power supply, and convert the power supply signal into the fifth electric signal, and transmit the fifth electric signal to the whole machine control module through the signal input end of the whole machine control module. The bucket control unit includes a first sliding rheostat and a second sliding rheostat. One end of the first sliding rheostat is connected with the input power supply, and the other end is connected with the second sliding rheostat. One end of the second sliding rheostat is connected with the first sliding rheostat, and the other end is connected with the signal input end of the whole machine control module and the ground respectively. The travel unit includes a first control switch and a second control switch. One end of the first control switch is connected with the first signal output end of the whole machine control module, and the other end is connected with the signal input end of the whole machine control module. One end of the second control switch is connected with the second signal output end of the whole machine control module, and the other end is connected with the signal input end of the whole machine control module. The first control switch and the second control switch are connected in parallel with each other; The first electric signal is a loader forward signal, and the second electric signal is a loader backward signal; The gear control unit comprises a third control switch and a fourth control switch; One end of the third control switch is connected with a third signal output end of the whole machine control module, and the other end is connected with a signal input end of the whole machine control module; One end of the fourth control switch is connected with a fourth signal output end of the whole machine control module, and the other end is connected with the signal input end of the whole machine control module; The third control switch and the fourth control switch are connected in parallel; The third electric signal is a gearbox upshift signal, and the fourth electric signal is a gearbox downshift signal.

2. A circuit board assembly, characterized by The loader control circuit comprises the loader control circuit according to claim 1.

3. A loader characterized by The circuit board assembly comprises the circuit board assembly according to claim 2.

4. The loader of claim 3, wherein, The control handle comprises: a gear box; a handle comprising a handle head and a handle rod, the handle head is formed with a panel mounting groove, and the handle rod is movably arranged in the gear box; a position sensor arranged in the gear box and electrically connected with the circuit board assembly, the position sensor is used to detect the position change of the handle rod in the gear box; and a button panel arranged in the panel mounting groove, the button panel is electrically connected with the circuit board assembly.

5. The loader of claim 4, wherein, The button panel comprises a button assembly used to control the up and down of the gear position of the loader gearbox; and / or The button panel comprises a rocker button used to control the running state of the loader.

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