An excavator engine coupling control device and method

Abstract

The application discloses a kind of excavator engine coupling control device and method, comprising: including mutually electrically connected main controller, switch control unit and engine controller;The main controller and switch control unit, main controller and engine controller are connected by bus respectively;Electronic monitor, emergency stop switch and emergency mode relay are connected on the main controller;By adopting power-on and start-stop switch independent design, realize power control and engine start-stop separation control, further through controller coupling start-stop, the intelligentization of start-stop control is realized, and the system can also be controlled by controller coupling flameout to realize the purpose that system key switch control electricity is uninterrupted when flameout;When controller fails, power supply and starting circuit can be switched by the contact state conversion of safety relay, and the starting circuit can be switched from coupling control to direct control by emergency mode relay, to improve the reliability of start-stop control system.

Description

Technical Field

[0001] This invention belongs to the field of excavator electrical control technology, specifically relating to an excavator engine coupling control device and method. Background Technology

[0002] With the development of intelligent technology, traditional excavator electrical systems can no longer adequately meet the needs of intelligent development. Excavator start-stop control systems achieve coupled intelligent control through a new intelligent architecture, thereby truly realizing the goal of defining intelligent products with software. Developing intelligent technology can significantly enhance product competitiveness.

[0003] Existing technologies mainly involve two approaches. One approach directly drives the engine to start or stop using a key switch. This system has a simpler electrical principle and better reliability, but its intelligence level is poor. It cannot achieve intelligent start-stop or asynchronous control for power failure and engine shutdown, thus failing to meet the requirement of stopping the engine without interrupting power. The other approach uses a controller-coupled start control system, which can solve the problem of intelligent start-up control. However, engine shutdown is directly driven by a key switch or other switch modules, lacking asynchronous shutdown capabilities. Furthermore, the control method lacks redundancy, making it prone to accidental engine shutdown in the event of controller failure, leading to control risks. Alternatively, it may fail to provide emergency engine start-stop for emergency avoidance operations in the event of controller failure, and its functional safety design fails to meet safety requirements. Summary of the Invention

[0004] The purpose of this invention is to provide an excavator engine coupling control device and method to achieve asynchronous control of power failure and engine shutdown, while also enabling emergency engine start-stop to achieve emergency avoidance operations.

[0005] To achieve the above objectives, the technical solution adopted by the present invention in the first aspect is: an excavator engine coupling control device, comprising a main controller, a switch control unit, and an engine controller electrically connected to each other; the main controller and the switch control unit, and the main controller and the engine controller are respectively connected via a bus;

[0006] Port P4 of the switch control unit is electrically connected to the first set of normally closed contacts of the emergency mode relay and the coil of the power relay. The first set of normally closed contacts of the emergency mode relay is electrically connected to the negative terminal of isolation diode D4. The positive terminal of isolation diode D4 is electrically connected to port DO2 of the main controller. Port P2 of the switch control unit is electrically connected to the second set of normally closed contacts of the emergency mode relay. The second set of normally closed contacts of the emergency mode relay is electrically connected to the negative terminal of isolation diode D5. The positive terminal of isolation diode D5 is electrically connected to port DO1 of the main controller. Port P3 of the switch control unit is electrically connected to port DI1 of the main controller. The coil of the emergency mode relay is electrically connected to port DO3 of the main controller. Port P1 of the switch control unit is connected to the positive terminal of the power supply.

[0007] The negative terminal of the isolation diode D5 is electrically connected to the control coil of the engine starting unit;

[0008] The negative terminal of the isolation diode D4 is electrically connected to the normally closed contact port H1 of the emergency stop switch; the normally closed contact port H2 of the emergency stop switch is electrically connected to the port keysw of the engine controller; the normally open contact port H3 of the emergency stop switch is grounded; and the normally open contact port H4 of the emergency stop switch is electrically connected to the port DI2 of the main controller.

[0009] Preferably, the main controller's ports CAN2H and CAN2L are electrically connected to the engine controller's ports CANL and CANH, respectively.

[0010] Preferably, the electronic monitor is electrically connected to the main controller and the switch control unit; the CANH port of the electronic monitor is electrically connected to the CANIH port of the main controller and the CANH port of the switch control unit; the CANL port of the electronic monitor is electrically connected to the CANIL port of the main controller and the CANL port of the switch control unit.

[0011] Preferably, the electronic monitor is equipped with a human-machine interface.

[0012] Preferably, the human-computer interaction interface is a touch screen.

[0013] Preferably, the switch control unit includes an integrated switch panel SCU, a one-button start switch S1, and a power switch S2;

[0014] The switch control unit's port P1, one-button start switch S1, isolation diode D1, and switch control unit's port P4 are sequentially and electrically connected; the anode of the isolation diode D1 is electrically connected to the one-button start switch S1 and port V2 of the integrated switch panel SCU; the cathode of the isolation diode D1 is electrically connected to the switch control unit's port P4.

[0015] The switch control unit's port P1, power switch S2, isolation diode D3, and switch control unit's port P2 are sequentially and electrically connected; the anode of the isolation diode D3 is electrically connected to the switch control unit's port P3, power switch S2, and port V1 of the integrated switch panel SCU; the cathode of the isolation diode D3 is electrically connected to the switch control unit's port P2.

[0016] The port P4 of the switch control unit, the isolation diode D2, and the port V3 of the integrated switch panel SCU are electrically connected in sequence; the cathode of the isolation diode D2 is electrically connected to the port P4 of the switch control unit, and the anode of the isolation diode D2 is electrically connected to the port V3 of the integrated switch panel SCU; the ports CANH and CANL of the integrated switch panel SCU are set as the ports CANH and CANL of the switch control unit.

[0017] Preferably, the integrated switch panel SCU, the one-button start switch S1, and the power switch S2 are integrated on the control panel.

[0018] Preferably, the one-button start switch S1 is configured as a self-reset button with redundant functions.

[0019] In a second aspect, the present invention provides a method for coupling control of an excavator engine, comprising:

[0020] When the power switch S1 of the switch control unit is closed, the excavator system is powered on. Then, the one-button start switch S2 is closed.

[0021] When the start signal is transmitted from port P3 of the switch control unit to port DI1 of the main controller, the engine speed signal of the engine controller is received and detected to determine the engine status. If the engine is stopped, the main controller outputs a high level from port DO3 and reaches port keysw of the engine controller through the normally closed contact of the emergency stop switch, thereby starting the excavator's engine. If the engine is running, a warning is sent to the electronic monitor via the bus.

[0022] When the main controller receives a start signal from the switch control unit via the bus, and the DI1 port of the main controller does not receive a start signal from the switch control unit, it sends an emergency status message to the electronic monitor via the bus; the start / stop operation is selected by the electronic monitor.

[0023] Preferably, when the engine is turned off, the one-button start switch S2 is disconnected. When the switch control unit's port P3 transmits the engine shutdown signal to the main controller's port DI1, it receives and detects the engine speed signal from the engine controller to determine the engine status. If the engine is running, the main controller's port DO3 is de-energized, and the excavator's engine is turned off through the engine controller. If the engine is stopped, a warning is sent to the electronic monitor via the bus.

[0024] Preferably, when the emergency stop switch is pressed, the main controller receives the emergency stop signal at port DI2, receives and detects the engine speed signal from the engine controller to determine the engine status; if the engine is running, the main controller sends an emergency shutdown status to the electronic monitor; after confirming the emergency shutdown of the engine through the redundant shutdown mode of the electronic monitor, an emergency stop command is sent to the engine controller through the bus between the engine controller and the main controller to control the emergency shutdown of the engine.

[0025] Preferably, when the main controller fails, the emergency mode relay coil is de-energized, and the normally closed contact of the emergency mode relay is in the closed state. The start / stop signal sent by the switch control unit reaches the engine controller port keysw through the emergency mode relay and the emergency stop switch. At the same time, the switch control unit port P2 is connected to the start unit coil through the normally closed contact of the safety relay, switching to the switch control unit directly controlling the engine. The engine can be started and stopped directly through the power switch and the one-button start / stop switch of the switch control unit.

[0026] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0027] This invention achieves separate control of power supply and engine start / stop by adopting an independent design for power-on and start / stop switches. Furthermore, it realizes intelligent start / stop control by coupling start / stop through the controller. At the same time, the system can also achieve the purpose of uninterrupted power supply when the engine is turned off by coupling the engine to the engine stop through the controller.

[0028] This invention constructs a multi-level redundancy design, employing engine shutdown control port and bus redundancy control. When the emergency stop switch malfunctions, the instrument panel can control the controller via the human-machine interface to achieve emergency shutdown through the bus. An emergency mode relay is also included; when the controller fails, the power supply and starting circuit can be switched by changing the contact state of the safety relay. This allows for a switch from coupled control to direct control of the start-stop circuit, enabling the system to still start the engine and perform emergency actions even after a controller failure, thereby improving the reliability of the start-stop control system. Attached Figure Description

[0029] Figure 1 This is a structural diagram of the excavator engine coupling control device provided in Embodiment 1;

[0030] Figure 2 This is a circuit diagram of the excavator engine coupling control device provided in Example 1;

[0031] Figure 3 This is the circuit diagram of the switch control unit provided in Example 1;

[0032] Figure 4 This is a structural diagram of the control panel provided in Example 1;

[0033] Figure 5 This is a flowchart of the excavator engine startup process provided in Example 2;

[0034] Figure 6 This is a flowchart of the redundant shutdown process for the excavator engine provided in Example 2;

[0035] Figure 7 This is the emergency shutdown flowchart for the excavator engine provided in Example 2.

[0036] In the diagram, 1 is the main controller; 2 is the electronic monitor; 3 is the starting unit; 4 is the engine controller; 5 is the emergency stop switch; 6 is the switch control unit; 7 is the power relay; and 8 is the emergency mode relay. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0038] It should be noted that in the description of this invention, the terms "front," "rear," "left," "right," "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used only for the convenience of describing the invention and do not require the invention to be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on the invention. The terms "front," "rear," "left," "right," "upper," and "lower" used in the description of this invention refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0039] Example 1

[0040] like Figures 1 to 4 As shown, an excavator engine coupling control device includes a main controller 1, a switch control unit 6, and an engine controller 4 that are electrically connected to each other; the main controller 1 and the switch control unit 6, and the main controller 1 and the engine controller 4 are respectively connected via a bus; the CAN2H and CAN2L ports of the main controller 1 are electrically connected to the CANL and CANH ports of the engine controller 4, respectively.

[0041] The switch control unit 6 includes an integrated switch panel SCU, a one-button start switch S1, and a power switch S2; the integrated switch panel SCU, the one-button start switch S1, and the power switch S2 are integrated on the control panel; the one-button start switch S1 is configured as a self-reset button with redundant functions.

[0042] Port P1 of the switch control unit 6, one-button start switch S1, isolation diode D1 and port P4 of the switch control unit 6 are connected in sequence; the anode of the isolation diode D1 is electrically connected to the one-button start switch S1 and port V2 of the integrated switch panel SCU; the cathode of the isolation diode D1 is electrically connected to port P4 of the switch control unit 6.

[0043] Port P1 of the switch control unit 6, power switch S2, isolation diode D3, and port P2 of the switch control unit 6 are connected in sequence; the anode of the isolation diode D3 is electrically connected to port P3 of the switch control unit 6, power switch S2, and port V1 of the integrated switch panel SCU; the cathode of the isolation diode D3 is electrically connected to port P2 of the switch control unit 6.

[0044] The port P4 of the switch control unit 6, the isolation diode D2, and the port V3 of the integrated switch panel SCU are electrically connected in sequence; the cathode of the isolation diode D2 is electrically connected to the port P4 of the switch control unit 6, and the anode of the isolation diode D2 is electrically connected to the port V3 of the integrated switch panel SCU; the ports CANH and CANL of the integrated switch panel SCU are set to the ports CANH and CANL of the switch control unit 6.

[0045] Port P4 of the switch control unit 6 is electrically connected to the first set of normally closed contacts of the emergency mode relay 8 and the coil of the power relay 7. The first set of normally closed contacts of the emergency mode relay 8 is electrically connected to the negative terminal of the isolation diode D4. The positive terminal of the isolation diode D4 is electrically connected to port DO2 of the main controller. Port P2 of the switch control unit 6 is electrically connected to the second set of normally closed contacts of the emergency mode relay 8. The second set of normally closed contacts of the emergency mode relay 8 is electrically connected to the negative terminal of the isolation diode D5. The positive terminal of the isolation diode D5 is electrically connected to port DO1 of the main controller. Port P3 of the switch control unit 6 is electrically connected to port DI1 of the main controller. The coil of the emergency mode relay 8 is electrically connected to port DO3 of the main controller. Port P1 of the switch control unit 6 is connected to the positive terminal of the power supply.

[0046] The negative terminal of the isolation diode D5 is electrically connected to the control coil of the engine starting unit 3;

[0047] The negative terminal of the isolation diode D4 is electrically connected to the normally closed contact port H1 of the emergency stop switch 5; the normally closed contact port H2 of the emergency stop switch 5 is electrically connected to the port keysw of the engine controller 4; the normally open contact port H3 of the emergency stop switch 5 is grounded; and the normally open contact port H4 of the emergency stop switch 5 is electrically connected to the port DI2 of the main controller.

[0048] The electronic monitor 2 is electrically connected to the main controller 1 and the switch control unit 6; the CANH port of the electronic monitor 2 is electrically connected to the CANIH port of the main controller 1 and the CANH port of the switch control unit 6; the CANL port of the electronic monitor 2 is electrically connected to the CANIL port of the main controller 1 and the CANL port of the switch control unit 6; the electronic monitor 2 is equipped with a human-machine interface; the human-machine interface is set as a touch screen or a non-touch screen.

[0049] This embodiment achieves separate control of power supply and engine start / stop by adopting an independent design for power-on and start / stop switches. Furthermore, it realizes intelligent start / stop control by coupling start / stop through the controller. At the same time, the system can also achieve the purpose of uninterrupted power supply when the engine is turned off by coupling engine shutdown through the controller.

[0050] Example 2

[0051] like Figures 5 to 7 As shown, an excavator engine coupling control method is provided. The control method provided in this embodiment can apply the control device described in Embodiment 1. The excavator engine coupling control method includes:

[0052] When the power switch S1 of the switch control unit 6 is closed, the excavator system is powered on. Then, the one-button start switch S2 is closed.

[0053] When the start signal is transmitted from port P3 of the switch control unit 6 to port DI1 of the main controller, the engine speed signal of the engine controller 4 is received and detected to determine the engine status. If the engine is stopped, the main controller outputs a high level from port DO3 and reaches port keysw of the engine controller 4 through the normally closed contact of the emergency stop switch 5, thereby starting the excavator's engine through the engine controller 4. If the engine is running, a warning is sent to the electronic monitor 2 via the bus.

[0054] When the main controller receives the start signal from the switch control unit 6 via the bus, and the DI1 port of the main controller does not receive the start signal from the switch control unit 6, it sends an emergency status to the electronic monitor 2 via the bus; and selects the start / stop operation through the electronic monitor 2.

[0055] When the engine is turned off, the one-button start switch S2 is disconnected. When the switch control unit 6 transmits the engine shutdown signal to the main controller's DI1 port via port P3, it receives and detects the engine speed signal from the engine controller to determine the engine status. If the engine is running, the main controller's port DO3 is de-energized, and the excavator's engine is turned off via the engine controller 4. If the engine is stopped, a warning is sent to the electronic monitor 2 via the bus.

[0056] When the emergency stop switch 5 is pressed, the main controller receives the emergency stop signal at port DI2, receives and detects the speed signal of the engine controller 4 to determine the engine status; if the engine is running, the main controller sends an emergency shutdown status to the electronic monitor 2; after the electronic monitor 2 confirms the emergency shutdown of the engine through the redundant shutdown mode, it sends an emergency stop command to the engine controller through the bus between the engine controller 4 and the main controller to control the emergency shutdown of the engine.

[0057] When the main controller fails, the coil of the emergency mode relay 8 is de-energized, and the normally closed contact of the emergency mode relay 8 is in the closed state. The start / stop signal sent by the switch control unit 6 reaches the port keysw of the engine controller 4 through the emergency mode relay 8 and the emergency stop switch 5. At the same time, the port P2 of the switch control unit 6 is connected to the coil of the starting unit 3 through the normally closed contact of the safety relay, switching to the switch control unit 6 directly controlling the engine. The engine can be started and stopped directly through the power switch and the one-button start / stop switch of the switch control unit 6.

[0058] This embodiment employs a multi-level redundancy design, utilizing engine shutdown control port and bus redundancy control. This allows the instrument cluster to control the controller via the human-machine interface to achieve emergency engine shutdown in the event of an emergency stop switch malfunction. Additionally, an emergency mode relay is included. When the controller fails, the power supply and starting circuit can be switched through the contact state transition of this safety relay. This allows for a switch from coupled control to direct control of the start-stop circuit, enabling the system to still start the engine and perform emergency actions even after a controller failure, thereby improving the reliability of the start-stop control system.

[0059] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. An excavator engine coupling control device characterized by, The main controller, the switch control unit and the engine controller are electrically connected to each other; the main controller and the switch control unit, and the main controller and the engine controller are connected through buses respectively; Port of switch control unit Electrically connecting the first group of normally closed contacts of the emergency mode relay and the coil of the power supply relay, the first group of normally closed contacts of the emergency mode relay being electrically connected with the negative electrode of the isolation diode D4; the positive electrode of the isolation diode D4 being electrically connected with the port DO2 of the main controller; the port of the switch control unit Electrically connecting the second group of normally closed contacts of the emergency mode relay; the second group of normally closed contacts of the emergency mode relay being electrically connected with the negative electrode of the isolation diode D5; the positive electrode of the isolation diode D5 being electrically connected with the port DO1 of the main controller; the port of the switch control unit being electrically connected with the port DI1 of the main controller; the coil of the emergency mode relay being electrically connected with the port DO3 of the main controller; the port of the switch control unit being connected with the positive electrode of the power supply The negative electrode of the isolation diode D5 is electrically connected to the control coil of the engine starting unit. The negative electrode of the isolation diode D4 is connected with the normally closed contact port of the emergency stop switch The normally closed contact port of the emergency stop switch is connected with the ground The normally open contact port of the emergency stop switch is connected with the port keysw of the engine controller The normally open contact port of the emergency stop switch is connected with the ground The port DI2 of the main controller is connected with the ground 2. The excavator engine coupling control device according to claim 1, characterized by, The port CAN2H of the main controller and the port CAN2L are electrically connected to the port CANL and the port CANH of the engine controller respectively.

3. The excavator engine coupling control device according to claim 1, characterized by, The electronic monitor is electrically connected to the main controller and the switch control unit; the port CANH of the electronic monitor is electrically connected to the port CANIH of the main controller and the port CANH of the switch control unit; the port CANL of the electronic monitor is electrically connected to the port CANIL of the main controller and the port CANL of the switch control unit.

4. The excavator engine coupling control device of claim 1, wherein, The switch control unit comprises an integrated switch panel SCU, a one-key starting switch S1 and a power switch S2. Port of switch control unit , one-key start switch S1, isolation diode D1 and port of switch control unit are connected in sequence; anode of isolation diode D1 is electrically connected to port of one-key start switch S1 and integrated switch panel SCU ; cathode of isolation diode D1 is electrically connected to port of switch control unit ​ Port of switch control unit , power switch S2, isolation diode D3 and port of switch control unit are connected in sequence; the anode of isolation diode D3 is electrically connected to the port of switch control unit , power switch S2 and port of integrated switch panel SCU ; the cathode of isolation diode D3 is electrically connected to the port of switch control unit ; Port of the switch control unit , a port of the isolation diode D2 and a port of the integrated switch panel SCU are electrically connected in sequence; a cathode of the isolation diode D2 is electrically connected to a port of the switch control unit , an anode of the isolation diode D2 is electrically connected to a port of the integrated switch panel SCU ; a port CANH and a port CANL of the integrated switch panel SCU are set as a port CANH and a port CANL of the switch control unit.

5. The excavator engine coupling control device according to claim 4, characterized by, The integrated switch panel SCU, the one-key starting switch S1 and the power switch S2 are integrated on a control panel.

6. The excavator engine coupling control device according to claim 5, characterized by, The one-key starting switch S1 is set as a self-resetting key with redundancy function.

7. The control method of the excavator engine coupling control device according to claim 4, characterized by, The system comprises: When the power switch S2 of the switch control unit is closed, the system of the excavator is powered on, the one-key starting switch S1 is closed, When the port of the switch control unit When the DI1 port of the main controller is transmitted with the start signal, the engine controller's speed signal is received and detected to determine the engine state; if the engine is in the stop state, the DO3 port of the main controller outputs high level, and through the normally closed contact of the emergency stop switch, the keysw port of the engine controller is reached, and the engine of the excavator is started through the engine controller. If the engine is in operation, a pre-warning is sent to the electronic monitor through the bus; When the main controller receives the starting signal of the switch control unit through the bus, and the DI1 port of the main controller does not receive the starting signal of the switch control unit, an emergency state is sent to the electronic monitor through the bus; the start-stop operation is selected by the electronic monitor.

8. The control method according to claim 7, characterized by The system further comprises: When the engine is off, the one-key start switch S1 is disconnected, and the port DO1 of the switch control unit is connected to the ground When the engine is off, the one-key start switch S1 is disconnected, and the port DO1 of the switch control unit is connected to the ground When the engine is off, the one-key start switch S1 is disconnected, and the port DO1 of the switch control unit is connected to the ground 9. The control method according to claim 7, characterized by The system further comprises: When the emergency stop switch is pressed, the emergency stop signal is received by the port DI2 of the main controller, the engine state is judged by receiving and detecting the speed signal of the engine controller; If the engine is in operation, an emergency shutdown state is sent to the electronic monitor by the main controller; after the engine emergency shutdown is confirmed by the redundant shutdown mode of the electronic monitor, the emergency shutdown instruction is sent to the engine controller through the bus between the engine controller and the main controller to control the engine emergency shutdown.

10. The control method according to claim 7, characterized by The system further comprises: When the main controller fails, the emergency mode relay coil is de-energized, and the normally closed contact of the emergency mode relay is in the closed state. The start-stop signal sent by the switch control unit reaches the port keysw of the engine controller through the emergency mode relay and the emergency stop switch, and at the same time, the port Through the normally closed contact of the safety relay and the starting unit coil, the switch control unit directly controls the engine, and the engine start and stop are directly controlled through the power switch S2 and the one-key start switch S1 of the switch control unit.

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