Excavator engine coupled control apparatus and method

Abstract

Disclosed in the present invention are an excavator engine coupled control apparatus and method. The excavator engine coupled control apparatus comprises: a main controller, a switch control unit and an engine controller which are electrically connected to each other. The main controller and the switch control unit are connected via a bus, and the main controller and the engine controller are connected via a bus; and the main controller is connected to an electronic monitor, an emergency stop switch and an emergency mode relay. By means of independent design of power-on and start-stop switches, power supply control is independent of engine start-stop control, and intelligent start-stop control is further achieved by means of controller-coupled start-stop. In addition, by means of controller-coupled engine shutdown, a system can further achieve the purpose of maintaining power supply by means of system key switch control during engine shutdowns. When the controller breaks down, power supply and starter circuits can be switched by means of a contact state transition of a safety relay; and, by means of the emergency mode relay, a transition of a start-stop circuit from coupled control to direct control can be achieved, thereby improving the reliability of a start-stop control system.

Description

Excavator engine coupling control device and method Technical Field

[0001] The present invention belongs to the technical field of excavator electrical control, and in particular relates to an excavator engine coupling control device and method. Background Art

[0002] With the development of intelligent technology, the traditional electrical system of excavators can no longer meet the needs of intelligent development. The excavator start-stop control system realizes coupled intelligent control through a new intelligent architecture, thereby truly realizing the goal of defining intelligent products with software. The development of intelligent technology can greatly improve the competitiveness of products.

[0003] There are two main existing technical approaches. One is to directly start or shut down the engine via a key switch. This system has a simple electrical principle and good reliability, but its intelligence level is low. It cannot achieve intelligent start and stop, nor can it achieve asynchronous control of power outage and shutdown. It cannot meet the demand for only shutting down the engine without power outage. Another control system that starts through controller coupling can solve the problem of intelligent start control, but the shutdown method directly drives the shutdown via a key switch or other switch module, which also does not meet the conditions for asynchronous shutdown. However, the control method has no redundancy, which can easily cause the engine to shut down accidentally in the event of a controller failure, resulting in control risks. In addition, it cannot achieve emergency start and stop of the engine to achieve risk avoidance in the event of a controller failure, and the functional safety design cannot meet safety requirements.

[0004] Summary of the invention.

[0005] The purpose of the present invention is to provide an excavator engine coupling control device and method to achieve asynchronous control of power failure and flameout, and at the same time be able to start and stop the engine in an emergency to achieve risk avoidance operations.

[0006] To achieve the above-mentioned object, the technical solution adopted by the present invention in a 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;

[0007] Port P4 of the switch control unit is electrically connected to the first group of normally closed contacts of the emergency mode relay and the coil of the power relay, and the first group of normally closed contacts of the emergency mode relay is electrically connected to the negative pole of the isolation diode D4; the positive pole of the 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 group of normally closed contacts of the emergency mode relay; the second group of normally closed contacts of the emergency mode relay is electrically connected to the negative pole of the isolation diode D5; the positive pole of the 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 pole of the power supply;

[0008] The cathode of the isolation diode D5 is electrically connected to the control coil of the engine starting unit;

[0009] The cathode 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; the normally open contact port H4 of the emergency stop switch is electrically connected to the port DI2 of the main controller.

[0010] Preferably, the port CAN2H and the port CAN2L of the main controller are electrically connected to the port CANL and the port CANH of the engine controller respectively.

[0011] Preferably, 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.

[0012] Preferably, a human-computer interaction interface is provided on the electronic monitor.

[0013] Preferably, the human-computer interaction interface is configured as a touch screen.

[0014] Preferably, the switch control unit includes an integrated switch panel SCU, a one-button start switch S1 and a power switch S2;

[0015] The port P1 of the switch control unit, the one-touch start switch S1, the isolation diode D1, and the port P4 of the switch control unit are electrically connected in sequence; the anode of the isolation diode D1 is electrically connected to the one-touch start switch S1 and the port V2 of the integrated switch panel SCU; the cathode of the isolation diode D1 is electrically connected to the port P4 of the switch control unit;

[0016] The port P1 of the switch control unit, the power switch S2, the isolation diode D3, and the port P2 of the switch control unit are electrically connected in sequence; the anode of the isolation diode D3 is electrically connected to the port P3 of the switch control unit, the power switch S2, and the port V1 of the integrated switch panel SCU; the cathode of the isolation diode D3 is electrically connected to the port P2 of the switch control unit;

[0017] Port P4 of the switch control unit, the isolation diode D2, and port V3 of the integrated switch panel SCU are electrically connected in sequence; the cathode of the isolation diode D2 is electrically connected to port P4 of the switch control unit, and the anode of the isolation diode D2 is electrically connected to port V3 of the integrated switch panel SCU; port CANH and port CANL of the integrated switch panel SCU are set to port CANH and port CANL of the switch control unit.

[0018] Preferably, the integrated switch panel SCU, the one-button start switch S1 and the power switch S2 are integrated on the control panel.

[0019] Preferably, the one-button start switch S1 is configured as a self-reset button with a redundant function.

[0020] In a second aspect, the present invention provides an excavator engine coupling control method, comprising:

[0021] When the power switch S1 of the switch control unit is closed, the excavator system is powered on, and the one-button start switch S2 is closed.

[0022] When the switch control unit's port P3 transmits a start signal to the main controller's DI1 port, it receives and detects the engine controller's speed signal to determine the engine status. If the engine is stopped, the main controller's port DO3 outputs a high level, which is transmitted through the normally closed contact of the emergency stop switch to the engine controller's port keysw, starting the excavator's engine through the engine controller. If the engine is running, an early warning is sent to the electronic monitor via the bus.

[0023] When the main controller receives the start signal from the switch control unit through the bus, and the DI1 port of the main controller does not receive the start signal from the switch control unit, the emergency state is sent to the electronic monitor through the bus; the start and stop operations are selected by the electronic monitor.

[0024] Preferably, when the engine is turned off, the one-button start switch S2 is disconnected, and the port P3 of the switch control unit transmits the shutdown signal to the DI1 port of the main controller, and receives and detects the speed signal of the engine controller to determine the engine status; if the engine is in the running state, the port DO3 of the main controller is controlled to be powered off, and the engine of the excavator is controlled to be turned off through the engine controller; if the engine is in the stopped state, an early warning is sent to the electronic monitor through the bus.

[0025] Preferably, when the emergency stop switch is pressed, the emergency stop signal is received by port DI2 of the main controller, and the speed signal of the engine controller is received and detected to determine the engine status; if the engine is in the running state, the emergency shutdown status is sent to the electronic monitor through the main controller; after the engine emergency shutdown is confirmed 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 engine emergency shutdown.

[0026] Preferably, when the main controller fails, the emergency mode relay coil is de-energized, the normally closed contacts of the emergency mode relay are in a closed state, and 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. At the same time, the port P2 of the switch control unit is connected to the start unit coil through the normally closed contact of the safety relay, and the switch control unit is switched to directly control the engine, and the engine start and stop are directly controlled through the power switch and one-button start-stop switch of the switch control unit.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention realizes separate control of power supply control and engine start and stop by adopting independent design of power-on and start-stop switches, and further realizes intelligent start and stop control by coupling start and stop with controller. At the same time, the system can also realize the purpose of non-interruption of power supply by key switch control of system when the engine is shut down by coupling shutdown with controller.

[0029] The present invention constructs a multi-level redundant design, adopts an engine shutdown control port and bus redundant control, so that when the emergency stop switch is abnormal, the instrument can control the controller through the human-computer interaction interface to achieve emergency shutdown through the bus. At the same time, an emergency mode relay is also provided. When the controller fails, the power supply and start circuit can be switched by converting the contact state of the safety relay, and the start-stop circuit can be switched from coupling control to direct control, so that the system can still start the engine through the start-stop switch after the controller fails, and perform some emergency action control, thereby improving the reliability of the start-stop control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] FIG1 is a structural diagram of an excavator engine coupling control device provided in Example 1;

[0031] FIG2 is a circuit diagram of an excavator engine coupling control device provided in Example 1;

[0032] FIG3 is a circuit diagram of a switch control unit provided in Example 1;

[0033] FIG4 is a structural diagram of a control panel provided in Example 1;

[0034] FIG5 is a flow chart of starting an excavator engine provided in Example 2;

[0035] FIG6 is a flowchart of redundant shutdown of an excavator engine provided by Example 2;

[0036] FIG7 is a flowchart of emergency shutdown of an excavator engine provided in Example 2.

[0037] In the figure, 1. Main controller; 2. Electronic monitor; 3. Starting unit; 4. Engine controller; 5. Emergency stop switch; 6. Switch control unit; 7. Power relay; 8. Emergency mode relay. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0039] It should be noted that, in the description of the present invention, the terms "front," "rear," "left," "right," "up," "down," "inside," and "outside" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are intended solely to facilitate the description of the present invention and do not require that the present invention be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "front," "rear," "left," "right," "up," and "down" used in the description of the present invention refer to directions in the accompanying drawings, and the terms "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0040] Example 1

[0041] As shown in Figures 1 to 4, 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, the main controller 1 and the engine controller 4 are respectively connected through buses; the port CAN2H and the port CAN2L of the main controller 1 are respectively electrically connected to the port CANL and the port CANH of the engine controller 4.

[0042] 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 set as a self-reset button with redundant function.

[0043] The port P1 of the switch control unit 6, the one-touch start switch S1, the isolation diode D1, and the port P4 of the switch control unit 6 are electrically connected in sequence; the anode of the isolation diode D1 is electrically connected to the one-touch start switch S1 and the port V2 of the integrated switch panel SCU; the cathode of the isolation diode D1 is electrically connected to the port P4 of the switch control unit 6;

[0044] The port P1 of the switch control unit 6, the power switch S2, the isolation diode D3, and the port P2 of the switch control unit 6 are electrically connected in sequence; the anode of the isolation diode D3 is electrically connected to the port P3 of the switch control unit 6, the power switch S2, and the port V1 of the integrated switch panel SCU; the cathode of the isolation diode D3 is electrically connected to the port P2 of the switch control unit 6;

[0045] 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 port CANH and the port CANL of the integrated switch panel SCU are set to the port CANH and the port CANL of the switch control unit 6.

[0046] Port P4 of the switch control unit 6 is electrically connected to the first group of normally closed contacts of the emergency mode relay 8 and the coil of the power relay 7, and the first group of normally closed contacts of the emergency mode relay 8 is electrically connected to the negative pole of the isolation diode D4; the positive pole of the isolation diode D4 is electrically connected to the port DO2 of the main controller; the port P2 of the switch control unit 6 is electrically connected to the second group of normally closed contacts of the emergency mode relay 8; the second group of normally closed contacts of the emergency mode relay 8 is electrically connected to the negative pole of the isolation diode D5; the positive pole of the isolation diode D5 is electrically connected to the port DO1 of the main controller; the port P3 of the switch control unit 6 is electrically connected to the port DI1 of the main controller; the coil of the emergency mode relay 8 is electrically connected to the port DO3 of the main controller; the port P1 of the switch control unit 6 is connected to the positive pole of the power supply;

[0047] The cathode of the isolation diode D5 is electrically connected to the control coil of the engine starting unit 3;

[0048] The cathode 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; the normally open contact port H4 of the emergency stop switch 5 is electrically connected to the port DI2 of the main controller.

[0049] The electronic monitor 2 is electrically connected to the main controller 1 and the switch control unit 6; the port CANH of the electronic monitor 2 is electrically connected to the port CANIH of the main controller 1 and the port CANH of the switch control unit 6; the port CANL of the electronic monitor 2 is electrically connected to the port CANIL of the main controller 1 and the port CANL of the switch control unit 6; a human-computer interaction interface is provided on the electronic monitor 2; the human-computer interaction interface is set to a touch screen or a non-touch screen.

[0050] This embodiment realizes separate control of power supply control and engine start and stop by adopting independent design of power-on and start-stop switches, and further realizes intelligent start and stop control by coupling start and stop with controller. At the same time, the system can also realize the purpose of power outage of system key switch control when the engine is shut down by coupling shutdown with controller.

[0051] Example 2

[0052] As shown in FIG5 to FIG7, a coupling control method for an excavator engine is provided. The control method provided in this embodiment can apply the control device described in Example 1. The coupling control method for an excavator engine includes:

[0053] When the power switch S1 of the switch control unit 6 is closed, the excavator system is powered on, and the one-button start switch S2 is closed.

[0054] When the port P3 of the switch control unit 6 transmits the start signal to the DI1 port of the main controller, it receives and detects the speed signal of the engine controller 4 to determine the engine status; if the engine is in the stopped state, the port DO3 of the main controller outputs a high level, and reaches the port keysw of the engine controller 4 through the normally closed contact of the emergency stop switch 5, and starts the excavator engine through the engine controller 4; if the engine is in the running state, an early warning is sent to the electronic monitor 2 through the bus;

[0055] When the main controller receives the start signal of the switch control unit 6 through the bus, and the DI1 port of the main controller does not receive the start signal of the switch control unit 6, the emergency state is sent to the electronic monitor 2 through the bus; the start and stop operations are selected by the electronic monitor 2.

[0056] When the engine is turned off, the one-button start switch S2 is disconnected, and the port P3 of the switch control unit 6 transmits the shutdown signal to the DI1 port of the main controller, which receives and detects the speed signal of the engine controller to determine the engine status; if the engine is in the running state, the port DO3 of the main controller is controlled to be powered off, and the excavator's engine is controlled to be turned off through the engine controller 4; if the engine is in the stopped state, an early warning is sent to the electronic monitor 2 through the bus.

[0057] When the emergency stop switch 5 is pressed, the emergency stop signal is received by the port DI2 of the main controller, and the speed signal of the engine controller 4 is received and detected to determine the engine status; if the engine is in the running state, the emergency shutdown status is sent to the electronic monitor 2 through the main controller; after the engine emergency shutdown is confirmed through the redundant shutdown mode of the electronic monitor 2, the emergency stop command is sent to the engine controller through the bus between the engine controller 4 and the main controller to control the engine emergency shutdown.

[0058] 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 a 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, and is switched to the switch control unit 6 to directly control the engine. The engine start and stop are directly controlled by the power switch and one-button start-stop switch of the switch control unit 6.

[0059] This embodiment has constructed a multi-level redundant design, using an engine shutdown control port and bus redundant control, so that when the emergency stop switch is abnormal, the instrument can control the controller through the human-machine interface to achieve emergency shutdown through the bus. At the same time, an emergency mode relay is also provided. When the controller fails, the power supply and start circuit can be switched by switching the contact state of the safety relay, and the start-stop circuit can be switched from coupled control to direct control. Therefore, after the controller fails, the system can still start the engine through the start-stop switch and perform some emergency action control, thereby improving the reliability of the start-stop control system.

[0060] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An excavator engine coupling control device, characterized in that: It includes a main controller, a switch control unit and an engine controller which are electrically connected to each other; the main controller and the switch control unit, the main controller and the engine controller are connected via a bus respectively; The port P4 of the switch control unit is electrically connected to the first group of normally closed contacts of the emergency mode relay and the coil of the power supply relay, and the first group of normally closed contacts of the emergency mode relay is electrically connected to the negative pole of the isolation diode D4; the positive pole of the isolation diode D4 is electrically connected to the port DO2 of the main controller; the port P2 of the switch control unit is electrically connected to the second group of normally closed contacts of the emergency mode relay; the second group of normally closed contacts of the emergency mode relay is electrically connected to the negative pole of the isolation diode D5; the positive pole of the isolation diode D5 is electrically connected to the port DO1 of the main controller; the port P3 of the switch control unit is electrically connected to the port DI1 of the main controller; the coil of the emergency mode relay is electrically connected to the port DO3 of the main controller; the port P1 of the switch control unit is connected to the positive pole of the power supply; The cathode of the isolation diode D5 is electrically connected to the control coil of the engine starting unit; The cathode 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; the normally open contact port H4 of the emergency stop switch is electrically connected to the port DI2 of the main controller.

2. The excavator engine coupling control device according to claim 1, characterized in that: The port CAN2H and the port CAN2L of the main controller 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 in that: 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 according to claim 1, characterized in that: The switch control unit includes an integrated switch panel SCU, a one-button start switch S1 and a power switch S2; The port P1 of the switch control unit, the one-button start switch S1, the isolation diode D1 and the port P4 of the switch control unit are electrically connected in sequence; the anode of the isolation diode D1 is electrically connected to the one-button start switch S1 and the port V2 of the integrated switch panel SCU; the cathode of the isolation diode D1 is electrically connected to the port P4 of the switch control unit; The port P1 of the switch control unit, the power switch S2, the isolation diode D3 and the port P2 of the switch control unit are electrically connected in sequence; the anode of the isolation diode D3 is electrically connected to the port P3 of the switch control unit, the power switch S2 and the port V1 of the integrated switch panel SCU; the cathode of the isolation diode D3 is electrically connected to the port P2 of the switch control unit; Port P4 of the switch control unit, the isolation diode D2 and port V3 of the integrated switch panel SCU are electrically connected in sequence; the cathode of the isolation diode D2 is electrically connected to port P4 of the switch control unit, and the anode of the isolation diode D2 is electrically connected to port V3 of the integrated switch panel SCU; port CANH and port CANL of the integrated switch panel SCU are set to port CANH and port CANL of the switch control unit.

5. The excavator engine coupling control device according to claim 4, characterized in that: The integrated switch panel SCU, the one-button start switch S1 and the power switch S2 are integrated on the control panel.

6. The excavator engine coupling control device according to claim 5, characterized in that: The one-button start switch S1 is configured as a self-reset button with a redundant function.

7. The control method of the excavator engine coupling control device according to claim 4, characterized in that: include: When the power switch S1 of the switch control unit is closed, the excavator system is powered on, and the one-button start switch S2 is closed. When the port P3 of the switch control unit transmits the start signal to the DI1 port of the main controller, the speed signal of the engine controller is received and detected to determine the engine state; if the engine is in the stopped state, the port DO3 of the main controller outputs a high level and reaches the port keysw of the engine controller through the normally closed contact of the emergency stop switch, and the excavator engine is started through the engine controller; If the engine is in operation, an early warning is sent to the electronic monitor via the bus; When the main controller receives the start signal from the switch control unit through the bus, and the DI1 port of the main controller does not receive the start signal from the switch control unit, the emergency state is sent to the electronic monitor through the bus; the start and stop operations are selected by the electronic monitor.

8. The control method according to claim 7, characterized in that: Also includes: When the engine is turned off, the one-button start switch S2 is disconnected, and the port P3 of the switch control unit transmits the shutdown signal to the DI1 port of the main controller, which receives and detects the speed signal of the engine controller to determine the engine status; if the engine is in the running state, the port DO3 of the main controller is powered off, and the excavator's engine is controlled to be shut down through the engine controller; if the engine is in the stopped state, an early warning is sent to the electronic monitor through the bus.

9. The control method according to claim 7, characterized in that: Also includes: When the emergency stop switch is pressed, the emergency stop signal is received by the port DI2 of the main controller, and the speed signal of the engine controller is received and detected to determine the engine status; If the engine is in operation, the emergency shutdown status is sent to the electronic monitor through the main controller; after the engine emergency shutdown is confirmed 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 engine emergency shutdown.

10. The control method according to claim 7, characterized in that: Also includes: When the main controller fails, the emergency mode relay coil is de-energized, and the normally closed contacts of the emergency mode relay are in a 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. At the same time, port P2 of the switch control unit is connected to the start unit coil through the normally closed contacts of the safety relay, and the switch control unit directly controls the engine. The power switch and one-button start / stop switch of the switch control unit directly control the engine start and shutdown.

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