Steering control system of electric forklift

Abstract

The embodiment of the utility model provides an electric forklift steering control system, and belongs to the field of electric forklift steering control. The control system comprises a battery for supplying power to the control system; the steering encoder is arranged in a steering wheel tubular column, the steering encoder is connected with the positive electrode and the negative electrode of the battery, and the A phase, the B phase and the C phase of the steering encoder output different pulse signals according to rotation of a steering wheel; the B + end of the pump electric controller is connected with the positive electrode of the battery, and the B-end of the pump electric controller is connected with the negative electrode of the battery; and the pump motor is connected with the pump electric controller through an encoder, and is used for controlling different rotating speeds by the pump electric controller when the pump electric controller receives the pulse signal of the steering encoder so as to control the steering of the electric forklift. The control system can control the rotating speed of the pump motor according to a rotating signal sent by the steering encoder in the steering wheel tubular column, so that the steering of the electric forklift is controlled.

Description

Technical Field

[0001] This utility model relates to the field of electric forklift steering control, and specifically to an electric forklift steering control system. Background Technology

[0002] In current electric forklift steering control systems, the steering motor and pump motor typically share a single pump motor. Currently, steering is triggered by pressing the brake pedal or accelerator, resulting in a fixed steering speed. Furthermore, the driver is unaware of the number of steering wheel rotations, the steering wheel angle, tire position, and direction of rotation. Therefore, current steering systems are unintelligent and inefficient. Consequently, a forklift steering control system is needed that allows steering to be triggered simply by activating the steering wheel. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide an electric forklift steering control system that can control the speed of the pump motor based on the rotation signal emitted by the steering encoder in the steering column, thereby controlling the steering of the electric forklift.

[0004] To achieve the above objectives, this utility model provides an electric forklift steering control system, the control system comprising:

[0005] A battery is provided to power the control system.

[0006] A steering encoder is installed in the steering column. The steering encoder is connected to the positive and negative terminals of the battery and is used to output different pulse signals in phases A, B, and C when the steering wheel is turned.

[0007] The pump control unit has its B+ terminal connected to the positive terminal of the battery and its B- terminal connected to the negative terminal of the battery. The A, B, and C phases of the steering encoder are also connected to the pump control unit.

[0008] The pump motor is connected to the pump control system via an encoder. When the pump control system receives a pulse signal from the steering encoder, it controls different speeds to control the steering of the electric forklift.

[0009] Optionally, the control system includes:

[0010] An angle sensor is installed on the steering axle of the electric forklift and connected to the pump control system to detect the actual steering angle of the forklift.

[0011] The display instrument has its B+ terminal connected to the positive terminal of the battery and its B- terminal connected to the negative terminal of the battery. The display instrument is also connected to the pump control system to display the number of steering wheel turns, tire position, tire speed, rotation direction, and rotation angle when the pump control system controls the electric forklift to turn.

[0012] Optionally, the control system includes:

[0013] A foot brake switch, the two ends of which are connected to the pump control system, is used to send signals to the pump control system to control the speed of the pump motor;

[0014] A seat switch, one end of which is connected to the pump control system and the other end of which is connected to the foot brake switch and the pump control system, is used to send a signal to the pump control system to control the speed of the pump motor.

[0015] Optionally, the control system includes an accelerator connected to the pump control unit, which sends a signal to the pump control unit to control the speed of the pump motor.

[0016] Optionally, the control system includes a DC-DC module, the negative terminals of which are connected together and grounded, the 80V port of the DC-DC module is connected to the positive terminal of the battery, and the 12V port of the DC-DC module is connected to the steering encoder to power the steering encoder.

[0017] Optionally, the control system includes a first switch, one end of which is connected to the positive terminal of the battery, and the other end of which is connected to the C interface of the DC-DC module and the pump control unit. The first switch is the key switch of the electric forklift and is used to control the switching of the pump control unit and the display instrument.

[0018] Optionally, the control system includes a first resistor, one end of which is connected to the positive terminal of the battery, and the other end of which is connected to the 80V port of the DC-DC module.

[0019] Optionally, the control system includes a second resistor, one end of which is connected to the positive terminal of the battery, and the other end of which is connected to one end of the first switch.

[0020] Optionally, the control system includes a third resistor, one end of which is connected to the positive terminal of the battery, and the other end of which is connected to the B+ terminal of the pump control.

[0021] Through the above technical solution, the electric forklift steering control system provided by this utility model uses a battery to power the control system. The steering encoder can be installed in the steering column and can be connected to the positive and negative terminals of the battery. When the steering wheel is rotated, phases A, B, and C of the steering encoder can output different pulse signals. The B+ terminal of the pump controller can be connected to the positive terminal of the battery, and the B- terminal of the pump controller can be connected to the negative terminal of the battery. The three phases A, B, and C of the steering encoder can be connected to the pump controller to output different pulse signals, thereby enabling the pump controller to perform different control logic based on the pulse signals output by the steering encoder. The pump motor can be connected to the pump controller via an encoder, allowing the pump controller to control different speeds when it receives pulse signals from the steering encoder, thus controlling the steering of the electric forklift and enabling the driver to operate the steering wheel more comfortably. This control system can control the speed of the pump motor based on the rotation signal emitted by the steering encoder in the steering column, thereby controlling the steering of the electric forklift.

[0022] Other features and advantages of this utility model embodiment will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0024] Figure 1 This is a connection diagram of an electric forklift steering control system according to one embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures

[0026] 1. Battery 2. Steering encoder

[0027] 3. Pump electrical control 4. Pump motor

[0028] 5. Angle sensor 6. Display instrument

[0029] 7. Foot brake switch 8. Seat switch

[0030] 9. Accelerator; 10. DC-DC module

[0031] 11. First switch 12. First resistor

[0032] 13. Second resistor 14. Third resistor Detailed Implementation

[0033] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0034] In the embodiments of this application, certain software, components, models and other existing solutions in the industry may be mentioned. These should be regarded as exemplary and are only intended to illustrate the feasibility of implementing the technical solution of this application. However, they do not mean that the applicant has used or necessarily used the solution.

[0035] Figure 1This is a connection diagram of an electric forklift steering control system according to one embodiment of the present invention. In this invention, the control system may include: a battery 1, a steering encoder 2, a pump control unit 3, and a pump motor 4. The battery 1 supplies power to the control system. The steering encoder 2 can be installed in the steering column, and when the steering wheel is rotated, the steering encoder 2 can emit pulse signals. The steering encoder 2 can be connected to the positive and negative terminals of the battery 1. Depending on the rotation of the steering wheel, phases A, B, and C of the steering encoder 2 can output different pulse signals. For every one revolution of the steering encoder, phase A outputs one pulse signal, and phases B and C output K pulse signals with a phase difference. The B+ terminal of the pump control unit 3 can be connected to the positive terminal of the battery 1, and the B- terminal of the pump control unit 3 can be connected to the negative terminal of the battery 1, allowing the battery 1 to supply power to the pump control unit 3. The A, B, and C phases of the steering encoder 2 can be connected to the pump control unit 3, thereby inputting different pulse signals to the pump control unit 3. The pump motor 4 can be connected to the pump control unit 3 via an encoder. When the pump control unit 3 receives a pulse signal from the steering encoder 2, it can control the speed of the pump motor 4 based on the pulse signal, thereby controlling the steering of the electric forklift. This allows the driver to operate the steering wheel more comfortably. The control system can control the speed of the pump motor based on the rotation signal emitted by the steering encoder in the steering column, thus controlling the steering of the electric forklift. The detection logic is as follows: Rotation count detection: A phase outputs a low-level signal to the pump control unit 3 for each rotation, and remains high-level for the rest of the time. Therefore, the number of low-level signals output by phase A can be used to determine the number of rotations of the steering wheel. Speed: The pump control unit 3 calculates the duration of the phase B signal and the number of high-level signals within that duration (the time axis is related to the speed of the steering wheel). The pump control unit 3 calculates the real-time speed of the steering wheel. The calculation period of the pump control unit 3 is 50 milliseconds. The calculated value is then displayed on the display instrument 6 via CAN communication. Direction of rotation: By determining the phase sequence of the B and C voltage levels using the pump electronic control 3, it can be determined whether to turn left or right. The B / C phase sequence can also be used to verify the correctness of the steering system's piping and hydraulic lines. Angle of rotation: Calculated from the number of voltage levels (K per revolution), the steering wheel angle can be calculated using the number of voltage levels that have passed through the B or C phases. The pump electronic control 3 then calculates the corresponding tire angle using the steering coefficients of the steering wheel and tires, displaying the tire angle on the instrument panel in real time. This improves the driver's judgment of the steering wheel and significantly enhances the intelligence of the steering system.

[0036] In one embodiment of this utility model, such as Figure 1As shown, the control system may include an angle sensor 5 and a display instrument 6. The angle sensor 5 can be installed on the steering axle of the electric forklift and can be connected to the pump control unit 3 to detect the actual steering angle of the forklift. The B+ terminal of the display instrument 6 can be connected to the positive terminal of the battery 1, and the B- terminal of the display instrument 6 can be connected to the negative terminal of the battery 1. The display instrument 6 can also be connected to the pump control unit 3 to display the number of steering wheel turns, tire position, tire speed, steering direction, and steering angle when the pump control unit 3 controls the steering of the electric forklift. It can be understood that the pump control unit 3 in this application controls the rotation of the forklift by the driver turning the steering wheel. The pump control unit 3 controls the speed of the pump motor 4 according to the speed of the driver turning the steering wheel, and the steering of the forklift is still achieved by the driver turning the steering wheel.

[0037] In one embodiment of this utility model, such as Figure 1 As shown, the control system may include a foot brake switch 7 and a seat switch 8. The two ends of the foot brake switch 7 can be connected to the pump control system 3 to send signals to it, allowing the pump control system 3 to control the speed of the pump motor 4 based on the signals from the foot brake switch 7. The seat switch 8 can be installed on the seat of the electric forklift to detect whether a driver is present. One end of the seat switch 8 can be connected to the pump control system 3, and the other end can be connected to both the foot brake switch 7 and the pump control system 3, thereby sending signals to the pump control system 3 so that the pump control system 3 can control the speed of the pump motor 4 based on the signals from the seat switch 8.

[0038] In one embodiment of this utility model, such as Figure 1 As shown, the control system may include an accelerator 9. The accelerator can be connected to the pump control unit 3. The accelerator 9 can accelerate the electric forklift and can also be used to send signals to the pump control unit 3 so that the pump control unit 3 can control the speed of the pump motor 4 according to the signals.

[0039] In one embodiment of this utility model, such as Figure 1 As shown, the control system may include a DC-DC module 10. The negative terminals of the DC-DC module 10 can be connected together and grounded. The 80V port of the DC-DC module 10 can be connected to the positive terminal of the battery 1, and the 12V port of the DC-DC module 10 can be connected to the steering encoder 2, thereby providing the steering encoder 2 with the converted voltage.

[0040] In one embodiment of this utility model, such as Figure 1As shown, the control system may include a first switch 11. One end of the first switch 11 may be connected to the positive terminal of the battery 1, and the other end may be connected to the C interface of the DC-DC module 10, and may also be connected to the pump control 3. The first switch 11 may be the key switch of the electric forklift, used to control the switching of the pump control 3 and the display instrument 6.

[0041] In one embodiment of this utility model, such as Figure 1 As shown, the control system may include a first resistor 12. One end of the first resistor 12 may be connected to the positive terminal of the battery 1, and the other end of the first resistor 12 may be connected to the 80V port of the DC-DC module 10 to limit the current in its circuit.

[0042] In one embodiment of this utility model, such as Figure 1 As shown, the control system may include a second resistor 13. One end of the second resistor 13 may be connected to the positive terminal of the battery 1, and the other end may be connected to the other end of the first switch 11 to limit the current in the circuit in which it is located.

[0043] In one embodiment of this utility model, such as Figure 1 As shown, the control system may include a third resistor 14. One end of the third resistor 14 may be connected to the positive terminal of the battery 1, and the other end may be connected to the B+ terminal of the pump control 3 to limit the current in its circuit.

[0044] Through the above technical solution, the electric forklift steering control system provided by this utility model uses a battery to power the control system. The steering encoder can be installed in the steering column and can be connected to the positive and negative terminals of the battery. When the steering wheel is rotated, phases A, B, and C of the steering encoder can output different pulse signals. The B+ terminal of the pump controller can be connected to the positive terminal of the battery, and the B- terminal of the pump controller can be connected to the negative terminal of the battery. The three phases A, B, and C of the steering encoder can be connected to the pump controller to output different pulse signals, thereby enabling the pump controller to perform different control logic based on the pulse signals output by the steering encoder. The pump motor can be connected to the pump controller via an encoder, allowing the pump controller to control different speeds when it receives pulse signals from the steering encoder, thus controlling the steering of the electric forklift and enabling the driver to operate the steering wheel more comfortably. This control system can control the speed of the pump motor based on the rotation signal emitted by the steering encoder in the steering column, thereby controlling the steering of the electric forklift.

[0045] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0046] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An electric fork truck steering control system, characterized by, The control system comprises: a battery for powering the control system; a steering encoder arranged in a steering wheel column, the steering encoder being connected to a positive pole and a negative pole of the battery, and configured to output different pulse signals of A, B and C phases of the steering encoder when the steering wheel is rotated; a pump electronic control, a B+ end of the pump electronic control being connected to the positive pole of the battery, a B- end of the pump electronic control being connected to the negative pole of the battery, and three phases of the steering encoder being connected to the pump electronic control; a pump motor, the pump motor being connected to the pump electronic control through the encoder, and configured to be controlled at different rotating speeds by the pump electronic control when the pump electronic control receives the pulse signals of the steering encoder, so as to control the steering of the electric forklift.

2. The control system of claim 1, wherein, The control system comprises: a steering angle sensor arranged on a steering axle of the electric forklift and connected to the pump electronic control, and configured to detect an actual steering angle of the forklift; a display instrument, a B+ end of the display instrument being connected to the positive pole of the battery, a B- end of the display instrument being connected to the negative pole of the battery, and the display instrument being connected to the pump electronic control, and configured to display the number of steering wheel steering turns, the tire position, the tire speed, the steering direction and the steering angle of the electric forklift when the pump electronic control controls the steering of the electric forklift.

3. The control system of claim 1, wherein, The control system comprises: a foot brake switch, two ends of the foot brake switch being connected to the pump electronic control, and configured to send signals to the pump electronic control, so as to control the rotating speed of the pump motor; a seat switch, one end of the seat switch being connected to the pump electronic control, the other end of the seat switch being connected to the foot brake switch, and the seat switch being connected to the pump electronic control, and configured to send signals to the pump electronic control, so as to control the rotating speed of the pump motor.

4. The control system of claim 1, wherein, The control system comprises an accelerator connected to the pump electronic control, and configured to send signals to the pump electronic control, so as to control the rotating speed of the pump motor.

5. The control system of claim 2, wherein, The control system comprises a DC-DC module, negative poles of the DC-DC module being connected together and grounded, an 80V port of the DC-DC module being connected to the positive pole of the battery, and a 12V port of the DC-DC module being connected to the steering encoder, so as to power the steering encoder.

6. The control system of claim 5, wherein, The control system comprises a first switch, one end of the first switch being connected to the positive pole of the battery, the other end of the first switch being connected to a C interface of the DC-DC module, and the first switch being connected to the pump electronic control, the first switch being a key switch of the electric forklift, and configured to control the on-off of the pump electronic control and the display instrument.

7. The control system of claim 5, wherein, The control system comprises a first resistor, one end of the first resistor being connected to the positive pole of the battery, and the other end of the first resistor being connected to the 80V port of the DC-DC module.

8. The control system of claim 6, wherein, The control system comprises a second resistor, one end of the second resistor being connected to the positive pole of the battery, and the other end of the second resistor being connected to one end of the first switch.

9. The control system of claim 1, wherein, The control system comprises a third resistor, one end of the third resistor being connected to the positive pole of the battery, and the other end of the third resistor being connected to the B+ end of the pump electronic control.

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