Hydraulic electric control system for working machine, and working machine

Abstract

The utility model provides a hydraulic electric control system of an operation machine, which comprises an engine control unit, a plurality of sensors, a plurality of sensors, a plurality of sensors, a plurality of sensors, a plurality of sensors, a plurality of sensors, a plurality of sensors, a plurality of sensors, a plurality of sensors and a plurality of sensors, the vehicle control unit can communicate with the engine control unit, calculates the theoretical rotating speed of the engine based on the engine control signal, and further compares the theoretical rotating speed with the actual rotating speed to generate a control instruction; and the hydraulic power control electromagnetic valve is configured to be operably connected with a vehicle control unit and adjust the maximum load pressure of the system according to the control instruction. The utility model further provides an operation machine, such as a loader, comprising the hydraulic electric control system.

Description

TECHNICAL FIELD

[0001] The embodiments disclosed by the utility model generally relate to the field of engineering machinery, and more particularly, to a hydraulic and electrical control system of a working machine, and a working machine provided with the hydraulic and electrical control system. BACKGROUND

[0002] The working machine generally comprises systems such as a power system, a hydraulic system and an electrical system which cooperate with each other, and the systems cooperate with each other to realize normal work of the working machine. However, when a complex working condition is encountered, especially when the working machine works at a high altitude where the air is thin, the output power of the engine is often insufficient due to insufficient air intake of the engine, which is usually manifested as a sharp drop in engine speed, and further causes the engine to stall and the working machine to fail to work normally.

[0003] However, there are many reasons for engine stall, and to prevent engine stall, some conventional solutions in the industry are often high in cost and cannot solve specific problems that occur under specific working conditions. SUMMARY

[0004] In order to overcome at least one of the above and other problems and defects existing in the prior art, the present disclosure is proposed, which effectively solves the problem of engine stall in the prior art.

[0005] The utility model embodiment provides a kind of hydraulic and electrical control system of working machine, comprising:

[0006] Engine control unit is configured to be linked to multiple sensors in function to receive engine actual speed signal and engine control signal collected in real time from multiple sensors;

[0007] Vehicle control unit can communicate with engine control unit, calculate engine theoretical speed based on engine control signal, and further compare theoretical speed and actual speed to generate control instruction;

[0008] Hydraulic power control solenoid valve is configured to be operatively coupled to vehicle control unit, and adjusts the maximum load pressure of system according to control instruction.

[0009] In some embodiments, the control instruction includes increasing the input current of the hydraulic power control solenoid valve when the theoretical speed is higher than the actual speed.

[0010] In some embodiments, adjusting the maximum load pressure of the system includes reducing the maximum load pressure of the system.

[0011] In some embodiments, a load-sensing variable pump is further included, and the hydraulic power control solenoid valve is configured to control the maximum load pressure of the system by responding to the input current of the vehicle controller and changing the swash plate angle of the load-sensing variable pump, thereby changing the output flow of the load-sensing variable pump.

[0012] In some embodiments, the system further includes: a pressure detection unit functionally linked to the vehicle control unit, the pressure detection unit being configured to detect a pressure signal and input the pressure signal to the vehicle control unit.

[0013] In some embodiments, the pressure detection unit includes a hydraulic system pressure sensor for detecting hydraulic system pressure and a load sensitive pressure sensor for detecting load sensitive pressure, and a change in the hydraulic system pressure responds to a change in the load sensitive pressure.

[0014] In some embodiments, there is a pressure difference between the hydraulic system pressure and the maximum load pressure, and the hydraulic power control solenoid valve is activated when the pressure difference is within a predetermined pressure range.

[0015] In some embodiments, the predetermined pressure range includes 0-60 bar.

[0016] In some embodiments, the engine control signal includes accelerator pedal travel.

[0017] In another aspect of the present disclosure, an exemplary embodiment provides a work machine including: the hydraulic and electrical control system described above.

[0018] In some embodiments, the work machine includes a loader.

[0019] The hydraulic and electrical control system of the operating machinery provided by the embodiment of the present utility model can effectively solve the problem of the engine rapidly reducing speed or even stalling when the engine power is insufficient, and can effectively control the hydraulic system to operate smoothly in a lower power range, thereby improving the user experience; when the engine power is increased, the suppressed hydraulic system power will also quickly recover, ensuring the working efficiency of the operating machinery.

[0020] Other objects and advantages of the present disclosure will become apparent from the following detailed description of the present disclosure with reference to the accompanying drawings, which will help to provide a comprehensive understanding of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The features and advantages of the present disclosure can be more clearly understood by referring to the accompanying drawings, which are schematic and should not be construed as limiting the present disclosure in any way. In the accompanying drawings:

[0022] Figure 1 is a block diagram schematically illustrating a configuration of a hydraulic and electrical control system according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0023] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this disclosure.

[0024] In the following detailed description, for ease of explanation, numerous specific details are set forth to provide a thorough understanding of the embodiments of the present disclosure. However, it will be apparent that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown schematically to simplify the drawings.

[0025] Figure 1 A block diagram schematically illustrates the configuration of a hydraulic and electrical control system according to an exemplary embodiment of the present disclosure.

[0026] refer to Figure 1 The hydraulic and electrical control system provided by the embodiment of the present invention includes an engine control unit (ECU) 100, which is configured to be functionally linked to multiple sensors, including an engine speed sensor 101 and a throttle sensor 102. The engine speed sensor 101 collects an actual engine speed signal 101S in real time, and the throttle sensor 102 collects an engine control signal 102S in real time. A vehicle control unit (VCU) 200 is capable of communicating with the ECU 100 and calculating the theoretical engine speed based on the engine control signal 102S received by the ECU 100. The theoretical engine speed is further compared with the actual engine speed to generate a control instruction. A hydraulic power control solenoid valve 300 is configured to be operably connected to the VCU 200 and adjust the maximum load pressure of the hydraulic and electrical control system according to the control instruction. The ECU 100 and the VCU 200 typically communicate via a CAN bus 400. However, it should be understood that other communication methods can also be used to transmit signals in practice, and the present invention does not limit the specific communication method.

[0027] The embodiment of the present invention can adjust the maximum load pressure of the system by setting the hydraulic power control solenoid valve 300 without setting up complex monitoring and adjustment modules, which is simple and convenient. Compared with traditional complex feedback control, the solution of the embodiment of the present invention greatly reduces the system cost.

[0028] In an embodiment of the present application, the control instruction includes increasing the input current 300S of the hydraulic power control solenoid valve 300 when the theoretical rotating speed is higher than the actual rotating speed. However, it should be understood that the control of the input current 300S of the hydraulic power control solenoid valve 300 by the control instruction depends on the selection of the hydraulic power control solenoid valve 300 in practice, and based on the selection of the hydraulic power control solenoid valve 300, it is determined to increase or decrease the input current 300S of the hydraulic power control solenoid valve 300.

[0029] In an embodiment of the present application, the maximum load pressure of the adjusting system includes reducing the maximum load pressure of the system. The hydraulic power control solenoid valve 300 can be a proportional relief valve to achieve more accurate control of the system output; when the input current 300S of the hydraulic power control solenoid valve 300 is increased, the hydraulic power control solenoid valve 300 can control the output of the hydraulic system, so that the maximum load pressure of the hydraulic system is reduced, and the power of the hydraulic system is also reduced, which can reduce the load on the engine from the hydraulic system, and can effectively avoid the engine stall. However, it should be understood that the hydraulic power control solenoid valve 300 can also take other forms in practice to meet the adjustment of the maximum load pressure of the system, and the specific selection of the hydraulic power control solenoid valve 300 is not limited in the present application.

[0030] In an embodiment of the present application, the system further includes a power element such as a load-sensitive variable pump (not shown), when the output current of the vehicle controller 200, that is, the input current 300S of the hydraulic power control solenoid valve 300 is increased, the output pressure of the hydraulic power control solenoid valve 300 is reduced, and the swash plate angle of the load-sensitive variable pump is also reduced, and the output flow of the load-sensitive variable pump is also reduced accordingly, thereby reducing the output power of the hydraulic system. However, it should be understood that the power element can also be other forms of pumps or elements in practice, and the selection of the power element and the implementation of the adjusting hydraulic system output power are not limited in the embodiments of the present application.

[0031] In an embodiment of the present application, the system further includes a pressure detection unit 201 linked in function with the vehicle control unit 200, and the pressure detection unit 201 is configured to detect a pressure signal 201S and input the detected pressure signal 201S to the vehicle control unit 200. The pressure signal 201S can be a hydraulic pressure, and the vehicle control unit 200 can include a controller separately arranged or configured by the working machine, and the vehicle control unit 200 can communicate with the engine control unit 100 according to the hydraulic pressure (i.e. the pressure signal 201S detected by the pressure detection unit 201), and provide a control signal such as a PWM signal to the hydraulic power control solenoid valve 300 to control the hydraulic power control solenoid valve 300.

[0032] In an embodiment of the present application, the pressure detection unit 201 comprises a hydraulic system pressure sensor 211 for detecting the hydraulic system pressure, and a load sensitive pressure sensor 212 for detecting the load sensitive pressure, the hydraulic system pressure changes in response to the change of the load sensitive pressure, the pressure of the hydraulic system in the embodiment of the present application changes with the change of the load sensitive pressure, for example, when the load sensitive pressure detected by the load sensitive pressure sensor 212 increases, the pressure of the hydraulic system detected by the hydraulic system pressure sensor 211 also increases. However, it should be understood that in practice the pressure detection unit 201 can also comprise one or more other pressure sensors to achieve all-around multi-angle detection of the system pressure; the selection of the pressure sensor can be a variable resistance type, a capacitive pressure sensor or a switch type pressure sensor, etc., and the embodiment of the present application does not specifically limit the number and specific selection of the pressure sensor included in the pressure detection unit 201.

[0033] In an embodiment of the present application, there is a pressure difference between the pressure of the hydraulic system detected by the hydraulic system pressure sensor 211 and the load sensitive pressure detected by the load sensitive pressure sensor 212, when the pressure difference is within a predetermined pressure range, the vehicle control unit 200 outputs a control signal to activate the hydraulic power control electromagnetic valve 300. For example, when the pressure difference between the pressure of the hydraulic system detected by the hydraulic system pressure sensor 211 and the load sensitive pressure detected by the load sensitive pressure sensor 212 is greater than the system preset threshold value (for example, 60 bar), the hydraulic power control electromagnetic valve 300 is not activated, i.e. the vehicle control unit 200 stops outputting the input current 300S to the hydraulic power control electromagnetic valve 300 to trigger the action of the hydraulic power control electromagnetic valve 300, so that the hydraulic power control electromagnetic valve 300 does not act. In practice, if the pressure difference between the pressure of the hydraulic system detected by the hydraulic system pressure sensor 211 and the load sensitive pressure detected by the load sensitive pressure sensor 212 is greater than the system preset threshold value, it is often caused by other hydraulic systems of the working machine such as the steering system, therefore, in order to avoid the combined effect of the load pressure of the other hydraulic systems of the working machine on the control system, the embodiment of the present application sets a preset threshold value for the above-mentioned pressure difference, and only when the pressure difference between the pressure of the hydraulic system detected by the hydraulic system pressure sensor 211 and the load sensitive pressure detected by the load sensitive pressure sensor 212 is within a predetermined pressure range, such as the predetermined pressure range includes 0-60 bar, at this time, the hydraulic power control electromagnetic valve 300 is activated, i.e. the vehicle control unit 200 can output a control signal to the hydraulic power control electromagnetic valve 300, i.e. the input current 300S, the hydraulic power control electromagnetic valve 300 acts, and then controls the output of the load sensitive variable pump, so that the load applied by the hydraulic system to the engine is reduced to a suitable range.

[0034] In an embodiment of the present application, the engine control signal 102S includes an accelerator pedal stroke. Illustratively, when the engine speed is reduced, the engine can be made to respond by depressing the engine accelerator pedal, and the engine control unit 100 can calculate the corresponding theoretical speed of the engine at this time according to the accelerator pedal stroke. However, it should be understood that in practice the engine control signal 102S can also be an accelerator knob angle or other form of signal, and the accelerator pedal can be an electronic accelerator pedal, and the form of the engine control signal 102S and the accelerator pedal is not specifically limited in the embodiments of the present application.

[0035] In addition, although not shown, the embodiments of the present application also provide a working machine, including but not limited to a loader, an excavator, a road roller, etc. It includes or is configured with the hydraulic and electrical control system described in any of the embodiments of the present application, thereby effectively avoiding engine stall during operation, and the working machine is not specifically limited in the embodiments of the present application.

[0036] Although embodiments of the present application have been shown and described, it would be appreciated by those of ordinary skill in the art that changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A hydraulic and electrical control system for an operating machine, characterized in that: include: an engine control unit configured to be functionally linked to a plurality of sensors to receive engine actual speed signals and engine control signals collected in real time from the plurality of sensors; a vehicle control unit capable of communicating with the engine control unit, calculating a theoretical engine speed based on the engine control signal, and further comparing the theoretical engine speed with the actual engine speed to generate a control instruction; The hydraulic power control solenoid valve is configured to be operatively connected to the vehicle control unit and to adjust the maximum load pressure of the system according to the control command.

2. The system according to claim 1, wherein: The control instruction includes controlling to increase the input current of the hydraulic power control solenoid valve when the theoretical speed is higher than the actual speed.

3. The system according to claim 2, characterized in that Adjusting the maximum load pressure of the system includes reducing the maximum load pressure of the system.

4. The system according to claim 2, wherein: A load-sensing variable pump is also included, and the hydraulic power control solenoid valve is configured to control the maximum load pressure of the system by responding to the input current from the vehicle controller and changing the swash plate angle of the load-sensing variable pump, thereby changing the output flow of the load-sensing variable pump.

5. The system according to claim 4, characterized in that Further including: A pressure detection unit is functionally linked to the vehicle control unit, the pressure detection unit being configured to detect a pressure signal and input the pressure signal to the vehicle control unit.

6. The system according to claim 5, characterized in that The pressure detection unit includes a hydraulic system pressure sensor for detecting hydraulic system pressure and a load sensitive pressure sensor for detecting load sensitive pressure, and the hydraulic system pressure changes in response to changes in the load sensitive pressure.

7. The system according to claim 6, characterized in that There is a pressure difference between the hydraulic system pressure and the maximum load pressure, and when the pressure difference is within a predetermined pressure range, the hydraulic power control solenoid valve is activated.

8. The system according to claim 7, characterized in that The predetermined pressure range includes 0-60 bar.

9. The system according to claim 1, wherein: The engine control signal includes accelerator pedal travel.

10. A working machine, characterized in that: include: A hydraulic and electrical control system according to any one of claims 1 to 8.

11. The working machine according to claim 10, wherein: The working machine includes a loader.

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