Control system of electric motor grader and electric motor grader

Abstract

The utility model discloses a control system of electric motor grader and electric motor grader. Control system of electric motor grader includes whole vehicle controller, CAN bus, control handle and hydraulic motor, whole vehicle controller, control handle and hydraulic motor are connected through CAN bus, control handle is used for receiving control signal, and sends to whole vehicle controller, whole vehicle controller is used for sending control command to hydraulic motor according to control signal, and controls hydraulic motor work, and hydraulic motor is used for driving the hydraulic system in electric motor grader. The utility model can make the hydraulic system response speed of motor grader more fast, and machine noise is smaller, and optimization driver's driving comfort.

Description

Technical Field

[0001] This utility model relates to the field of engineering equipment technology, and in particular to a control system and an electric grader. Background Technology

[0002] With the rapid development of new energy technologies in China, the construction machinery industry is undergoing a major transformation from traditional fuel-powered to electric-powered systems. Electric loaders, electric excavators, and other new energy equipment have gradually achieved industrial application. Against this backdrop, the development of electric graders has become an inevitable requirement to adapt to the trends of low-carbon and intelligent manufacturing.

[0003] Traditional fuel-powered graders typically employ an engine-driven hydraulic pump control system, using mechanical or hydraulic methods to control the movement of various working devices. This system has inherent drawbacks: First, its energy conversion efficiency is low, requiring the engine to continuously operate to provide hydraulic power, making it impossible to precisely adjust power output according to actual working conditions, resulting in energy waste; second, traditional hydraulic systems have limited control precision; and third, engine-based hydraulic systems are noisy. These shortcomings render traditional engine-based hydraulic control strategies unsuitable for current needs. Utility Model Content

[0004] This utility model provides a control system for an electric grader and an electric grader, so that the hydraulic system of the grader responds faster, the machine noise is lower, and the driver's driving comfort is optimized.

[0005] In a first aspect, this utility model provides a control system for an electric grader, the control system of which includes a vehicle controller, a CAN bus, a control handle, and a hydraulic motor;

[0006] The vehicle controller, the control handle, and the hydraulic motor are connected via the CAN bus;

[0007] The control handle is used to receive control signals and send them to the vehicle controller; the vehicle controller is used to send control commands to the hydraulic motor according to the control signals to control the hydraulic motor to work; the hydraulic motor is used to drive the hydraulic system in the electric grader.

[0008] Optionally, the control system of the electric grader also includes a multi-way valve;

[0009] The multi-way valve is located in the hydraulic system and is connected to the vehicle controller via the CAN bus. The vehicle controller is also used to control the opening and closing of the multi-way valve according to the control signal.

[0010] Optionally, the control handle includes at least a left-hand control handle and a right-hand control handle;

[0011] Both the left-hand control handle and the right-hand control handle are connected to the vehicle controller via the CAN bus. The left-hand control handle is used to receive left-hand control signals and send them to the vehicle controller; the right-hand control handle is used to receive right-hand control signals and send them to the vehicle controller; the vehicle controller is also used to control the hydraulic motor to work according to the left-hand control signals and the right-hand control signals.

[0012] Optionally, the hydraulic motor includes a hydraulic motor controller and a motor body;

[0013] The hydraulic motor controller is connected to the motor body and is connected to the vehicle controller via the CAN bus. The hydraulic motor controller is used to receive the control command and control the motor body to rotate according to the control command.

[0014] Optionally, the control system of the electric grader also includes an alarm module;

[0015] The alarm module is connected to the CAN bus and is used to issue an alarm signal when the hydraulic motor fails.

[0016] Optionally, the hydraulic motor is connected to the hydraulic pump, which is located in the hydraulic system; the hydraulic motor is used to drive the hydraulic pump.

[0017] Optionally, the control system of the electric grader also includes a display terminal;

[0018] The display terminal is connected to the vehicle controller via the CAN bus, and the display terminal is used to display the working status of the hydraulic motor.

[0019] Optionally, the CAN bus includes a main CAN bus and a backup CAN bus.

[0020] Optionally, the control system of the electric grader also includes a battery; the battery is connected to the vehicle controller, the control handle and the hydraulic motor respectively.

[0021] Secondly, this utility model embodiment also provides an electric grader, which includes the control system of the electric grader in any embodiment of this utility model.

[0022] This utility model provides a control system for an electric grader and the electric grader itself. The control system includes a vehicle controller, a CAN bus, a control handle, and a hydraulic motor. The vehicle controller, control handle, and hydraulic motor are connected via the CAN bus. The control handle receives control signals and sends them to the vehicle controller. The vehicle controller sends control commands to the hydraulic motor based on the control signals, controlling the hydraulic motor to operate. The hydraulic motor drives the hydraulic system in the electric grader. The hydraulic motor accelerates faster than an engine. The hydraulic motor is directly connected to the hydraulic pump, eliminating the need for a torque converter, resulting in faster pressure build-up in the hydraulic system and a quicker response time. The hydraulic system uses a hydraulic motor as its power source, which is quieter than traditional engine power sources. Through bus control, acceleration only requires pulling the control handle, optimizing driver comfort. Attached Figure Description

[0023] Figure 1 A schematic diagram of the control system of an electric grader provided for an embodiment of this utility model;

[0024] Figure 2 A schematic diagram of the control system of another electric grader provided in an embodiment of this utility model;

[0025] Figure 3 This is a schematic diagram of the control system of another electric grader provided in an embodiment of the present utility model. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] Figure 1 A schematic diagram of the control system of an electric grader provided in an embodiment of this utility model is shown below. Figure 1 As shown, the control system of the electric grader includes a vehicle controller 110, a CAN bus 120, a control handle 130, and a hydraulic motor 140. The vehicle controller 110, the control handle 130, and the hydraulic motor 140 are connected via the CAN bus 120. The control handle 130 is used to receive control signals and send them to the vehicle controller 110. The vehicle controller 110 is used to send control commands to the hydraulic motor 140 according to the control signals, controlling the hydraulic motor 140 to work. The hydraulic motor 140 is used to drive the hydraulic system in the electric grader.

[0028] The vehicle controller 110, serving as the core of the control system, can employ a high-performance PLC or a dedicated engineering machinery controller, equipped with multiple CAN bus interfaces and digital / analog I / O ports. The control handle 130 can include multiple operating handles, preferably inductive electric handles, whose output signals are digital or analog signals (transmitted via the CAN bus after internal conversion). The hydraulic motor 140 can connect to the hydraulic system of the electric grader, driving the hydraulic pump to perform different hydraulic actions. The vehicle controller 110, control handle 130, and hydraulic motor 140 are connected via the same CAN bus 120 for data communication, enabling control of multiple hydraulic actions through the control handle 130. Communication via the CAN bus 120 uses electrical signals, resulting in fast transmission speeds. The hydraulic motor 140 accelerates quickly, establishing system pressure more rapidly and providing a faster hydraulic response. The hydraulic system's power source is the hydraulic motor 140, which, compared to traditional engine power sources, has lower noise and faster response, providing a more comfortable operating environment for the driver.

[0029] Specifically, during the operation of the electric grader's control system, the operator issues operating commands via the control handle 130, such as controlling the blade's lifting and rotation. The control signals generated by the control handle 130 are sent to the vehicle controller 110 via the CAN bus 120. The vehicle controller 110 receives and analyzes these signals, comprehensively judging the operator's actual intention. Based on the analysis results, the vehicle controller 110 generates corresponding control commands, such as pulse width modulation (PWM) signals or digital control commands, and sends them to the controller of the hydraulic motor 140 via the CAN bus 120. The controller of the hydraulic motor 140 drives the motor body to run according to the received commands, thereby driving the hydraulic pump to work, providing power to the entire hydraulic system, and realizing the grader's corresponding actions. In the control system of the electric grader of this embodiment, the hydraulic motor 140 accelerates faster than the engine. The hydraulic motor 140 is directly connected to the hydraulic pump in the hydraulic system, without needing a torque converter, resulting in faster pressure build-up in the hydraulic system and a faster response speed for the electric grader's hydraulic system. The hydraulic system uses a hydraulic motor 140 as its power source. Compared to traditional engine power sources, the hydraulic motor 140 is quieter, responds faster, and provides a more comfortable operating environment for the driver. The hydraulic motor 140 is controlled via a bus; acceleration only requires pulling the control lever 130, whereas traditional vehicles require simultaneously pressing the accelerator pedal deeply to achieve the same effect. Therefore, it reduces the driver's workload and makes driving easier.

[0030] This utility model embodiment provides a control system for an electric grader. The control system includes a vehicle controller, a CAN bus, a control handle, and a hydraulic motor. The vehicle controller, control handle, and hydraulic motor are connected via the CAN bus. The control handle receives control signals and sends them to the vehicle controller. The vehicle controller sends control commands to the hydraulic motor based on the control signals, controlling the hydraulic motor to operate. The hydraulic motor drives the hydraulic system in the electric grader. The hydraulic motor accelerates faster than an engine. The hydraulic motor is directly connected to the hydraulic pump, eliminating the need for a torque converter, resulting in faster pressure build-up in the hydraulic system and a faster response time. The hydraulic system uses a hydraulic motor as its power source, which is quieter than a traditional engine power source. Through bus control, acceleration only requires pulling the control handle, optimizing driver comfort.

[0031] Figure 2 A schematic diagram of the control system of another electric grader provided in an embodiment of this utility model is shown below. Figure 2 As shown, the control system of the electric grader also includes a multi-way valve 150; the multi-way valve 150 is located in the hydraulic system and is connected to the vehicle controller 110 via the CAN bus 120. The vehicle controller 110 is also used to control the opening and closing of the multi-way valve 150 according to the control signal.

[0032] The multi-way valve 150 is integrated into the hydraulic system and connected to the vehicle controller 110 via the CAN bus 120. While sending control commands to the hydraulic motor 140, the vehicle controller 110 can also directly send switching commands to the multi-way valve 150 to control its opening and closing. This precisely controls the on / off state and flow distribution of each hydraulic circuit in the hydraulic system, adjusting the direction and flow of hydraulic oil to various actuators, such as the blade lifting cylinder and blade tilting cylinder, to achieve complex composite motion control.

[0033] Optional, such as Figure 2 As shown, the control handle 130 includes at least a left-hand control handle 131 and a right-hand control handle 132; both the left-hand control handle 131 and the right-hand control handle 132 are connected to the vehicle controller 110 via the CAN bus 120. The left-hand control handle 131 is used to receive left-hand control signals and send them to the vehicle controller 110; the right-hand control handle 132 is used to receive right-hand control signals and send them to the vehicle controller 110; the vehicle controller 110 is also used to control the hydraulic motor 140 to work according to the left-hand control signals and the right-hand control signals.

[0034] Specifically, the left-hand control handle 131 and the right-hand control handle 132 can realize different control actions of the electric grader. For example, the left-hand control handle 131 can be configured to control the blade rotation and front wheel tilt, while the right-hand control handle 132 can be configured to control the blade swing and articulated steering. The control button functions integrated on the left-hand control handle 131 and the right-hand control handle 132 can be customized according to the specific model and grader operation requirements. The left-hand control handle 131 can receive the left-hand control signal from the operator's left hand and send it to the vehicle controller 110; the right-hand control handle 132 can receive the right-hand control signal from the operator's right hand and send it to the vehicle controller 110. The vehicle controller 110 controls the hydraulic motor 140 to work based on the left-hand and right-hand control signals to optimize the driver's driving comfort.

[0035] Optional, such as Figure 2 As shown, the hydraulic motor 140 includes a hydraulic motor controller 141 and a motor body 142. The hydraulic motor controller 141 is connected to the motor body 142 and is connected to the vehicle controller 110 via a CAN bus 120. The hydraulic motor controller 141 is used to receive control commands and control the motor body 142 to rotate according to the control commands.

[0036] Specifically, the hydraulic motor controller 141 receives control commands from the vehicle controller 110 and controls the motor body 142 to rotate according to the control commands. The hydraulic motor controller 141 can employ advanced algorithms such as vector control to control the motor body 142, achieving a wider speed range and faster dynamic response. The hydraulic motor controller 141 receives control commands from the vehicle controller 110 and drives the motor body 142 to operate at the required speed and direction. The motor body 142 directly or through a transmission mechanism drives the hydraulic pump in the hydraulic system, providing hydraulic power to the entire working device (such as the blade cylinder), thereby realizing the corresponding hydraulic actions of the grader.

[0037] Furthermore, the controllers of the hydraulic motor controller 141 and the multi-way valve 150 can actively transmit their real-time operating parameters to the vehicle controller 110 via the CAN bus 120, such as motor winding temperature, output torque, valve spool position feedback, and pressure sensor readings. The vehicle controller 110 has a built-in diagnostic algorithm that continuously monitors these parameters. Once it detects a persistently abnormal parameter, such as excessive motor current or excessive deviation between valve spool command and feedback position, it determines that the corresponding component may be faulty. It then sends a command to the display terminal 170 via the CAN bus 120 to trigger an audible and visual alarm and display the specific fault type and suggested handling measures on the screen.

[0038] Optional, such as Figure 2As shown, the control system of the electric grader also includes an alarm module 160; the alarm module 160 is connected to the CAN bus 120 and is used to issue an alarm signal when the hydraulic motor 140 fails.

[0039] Specifically, the multi-way valve 150 and the hydraulic motor controller 141 can feed back the current hardware operating status to the CAN bus 120 and send it to the alarm module 160. The alarm module 160 can issue an alarm signal when it receives fault information from the hydraulic motor 140 or the multi-way valve 150. The alarm signal can be an audible and visual alarm signal, thereby realizing the function of fault alarm diagnosis and improving the safety of the electric grader during operation.

[0040] Optional, such as Figure 2 As shown, the control system of the electric grader also includes a display terminal 170; the display terminal 170 is connected to the vehicle controller 110 via the CAN bus 120, and the display terminal 170 is used to display the working status of the hydraulic motor 140.

[0041] Specifically, the display terminal 170 can be an LCD screen or a touch screen, which can display the system status in real time, such as: the working current, speed and temperature of the hydraulic motor 140; the position feedback of each valve core of the multi-way valve 150; the operation input status of the control handle 130; and system fault codes and alarm information, etc.

[0042] Figure 3 A schematic diagram of the control system of another electric grader provided in this embodiment of the present invention is shown below. Figure 3 As shown, the CAN bus 120 includes a main CAN bus 121 and a backup CAN bus 122.

[0043] Specifically, to improve communication reliability, the CAN bus 120 includes a main CAN bus 121 and a backup CAN bus 122. The CAN bus 120 can use twisted-pair shielded cable as both the main and backup CAN bus 121. Through a dual redundancy design—that is, setting up one main CAN bus 121 and one backup CAN bus 122—data is transmitted normally through the main CAN bus 121. When the main CAN bus 121 fails, the system can automatically switch to the backup CAN bus 122 to continue operation. By integrating the CAN bus 120, the cumbersome hard-wiring connections in traditional control systems are significantly reduced, improving system reliability and maintainability.

[0044] Optionally, the control system of the electric grader also includes a battery; the battery is connected to the vehicle controller 110, the control handle 130 and the hydraulic motor 140 respectively.

[0045] Specifically, the battery is connected to the vehicle controller 110, the control handle 130, and the hydraulic motor 140 respectively, providing power to the vehicle controller 110, the control handle 130, and the hydraulic motor 140. At the same time, the battery also provides power to other electrical devices on the electric grader, thus powering the electric grader.

[0046] In this invention, the control system of the electric grader is interconnected only via a CAN bus 120. Left-hand and right-hand control signals are transmitted to the vehicle controller 110. Upon receiving these signals, the vehicle controller 110 analyzes the driver's intentions and sends corresponding control commands to the multi-way valve 150 and the hydraulic motor controller 141 to achieve the desired hydraulic actions. This control system can be applied not only to electric graders but also to other new energy construction machinery such as electric loaders, electric excavators, and electric telescopic forklifts.

[0047] This utility model embodiment provides a control system for an electric grader. Compared with existing electric graders, the control system of the electric grader has the following advantages: the hydraulic motor 140 accelerates faster than an engine; the hydraulic motor 140 is directly connected to the hydraulic pump, eliminating the need for a torque converter, resulting in faster hydraulic system pressure build-up; overall, the hydraulic response speed is faster; the hydraulic motor 140 is bus-controlled, requiring only the pulling of the control handle 130 to accelerate, whereas traditional vehicles require simultaneous deep pressing of the accelerator pedal to achieve the same effect, thus reducing driver operation and making driving easier; the hydraulic system's power source is the hydraulic motor 140, which has lower noise and faster response compared to traditional engine power sources, providing a more comfortable operating environment for the driver.

[0048] This utility model embodiment also provides an electric grader, which includes the control system of the electric grader in any embodiment of this utility model.

[0049] Specifically, the electric grader provided in this utility model embodiment includes the control system of the electric grader proposed in any of the above embodiments, and has the beneficial effects of the control system of the electric grader proposed in the above embodiments, which will not be repeated here.

[0050] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A control system for an electric grader, characterized in that, The control system of the electric grader includes a vehicle controller, a CAN bus, a control handle, and a hydraulic motor; The vehicle controller, the control handle, and the hydraulic motor are connected via the CAN bus; The control handle is used to receive control signals and send them to the vehicle controller; the vehicle controller is used to send control commands to the hydraulic motor according to the control signals to control the hydraulic motor to work; the hydraulic motor is used to drive the hydraulic system in the electric grader.

2. The control system of the electric grader according to claim 1, characterized in that, The control system of the electric grader also includes a multi-way valve; The multi-way valve is located in the hydraulic system and is connected to the vehicle controller via the CAN bus. The vehicle controller is also used to control the opening and closing of the multi-way valve according to the control signal.

3. The control system of the electric grader according to claim 1, characterized in that, The control handle includes at least a left-hand control handle and a right-hand control handle; Both the left-hand control handle and the right-hand control handle are connected to the vehicle controller via the CAN bus. The left-hand control handle is used to receive left-hand control signals and send them to the vehicle controller; the right-hand control handle is used to receive right-hand control signals and send them to the vehicle controller; the vehicle controller is also used to control the hydraulic motor to work according to the left-hand control signals and the right-hand control signals.

4. The control system of the electric grader according to claim 1, characterized in that, The hydraulic motor includes a hydraulic motor controller and a motor body; The hydraulic motor controller is connected to the motor body and is connected to the vehicle controller via the CAN bus. The hydraulic motor controller is used to receive the control command and control the motor body to rotate according to the control command.

5. The control system of the electric grader according to claim 4, characterized in that, The control system of the electric grader also includes an alarm module; The alarm module is connected to the CAN bus and is used to issue an alarm signal when the hydraulic motor fails.

6. The control system of the electric grader according to claim 1, characterized in that, The hydraulic motor is connected to the hydraulic pump, which is located in the hydraulic system; the hydraulic motor is used to drive the hydraulic pump.

7. The control system of the electric grader according to claim 1, characterized in that, The control system of the electric grader also includes a display terminal; The display terminal is connected to the vehicle controller via the CAN bus, and the display terminal is used to display the working status of the hydraulic motor.

8. The control system of the electric grader according to claim 1, characterized in that, The CAN bus includes a main CAN bus and a backup CAN bus.

9. The control system of the electric grader according to any one of claims 1-8, characterized in that, It also includes a battery; the battery is connected to the vehicle controller, the control handle and the hydraulic motor respectively.

10. An electric grader, characterized in that, The electric grader includes the control system of the electric grader according to any one of claims 1-9.

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