An engine electro-hydraulic control automatic idle speed system, method and engineering vehicle

Abstract

The present application relates to the technical field of idle control, and discloses an engine electro-hydraulic control automatic idle system, method and engineering vehicle.The first and second pressure switches are connected with a hydraulic system, the first pressure switch is used for controlling the conduction of the first pressure oil port and the third working oil port of a three-position four-way electromagnetic valve, the second pressure switch is used for controlling the conduction of the first pressure oil port and the fourth working oil port of the three-position four-way electromagnetic valve, the hydraulic system supplies oil to the first oil cylinder through the first pressure oil port and the third working oil port, a piston in the first oil cylinder pushes the engine throttle to move to an idle position, and the discharged oil enters an oil storage oil cylinder through a cavity opening, the hydraulic system supplies oil to the oil storage oil cylinder through the first pressure oil port and the fourth working oil port, so that the piston in the oil storage oil cylinder moves, and the received oil discharged from the first oil cylinder is returned to the first oil cylinder, thereby realizing the quantitative control of the in-out oil in the oil cylinder cavity in the electro-hydraulic combination mode, and realizing the consistency of the piston to and fro position.

Description

Technical Field

[0001] This invention relates to the field of idling speed control technology, specifically to an engine electro-hydraulic control automatic idling system, method, and engineering vehicle. Background Technology

[0002] Automatic idling speed control for excavators is an energy-saving device that automatically detects the excavator's operating status. When the engine is not running for 4-6 seconds, it controls the engine throttle to enter idle speed from high speed. When the operator starts working on the excavator, the engine throttle automatically returns to the operating speed before idling.

[0003] The working principle of existing automatic idling devices may include the mechanical throttle engine, which, by adding a vehicle electronic control unit (VECU) and a throttle motor, drives the throttle cable to adjust the engine speed. The automatic idling function is realized by detecting the working pressure of the excavator through a pressure switch or pressure sensor. When the driver does not operate the handle, the pressure is too low to open the pressure switch or sensor, and output a signal to the controller to adjust the engine to enter idle speed or working speed.

[0004] However, implementing automatic idle function requires adding a vehicle controller and throttle motor. The engine speed adjustment is changed to an electronic potentiometer knob, which is costly. The motor angle is converted into stroke control and the number of pulse signals. The requirements for the idle stroke of the throttle cable are small and the manufacturing precision is high. For mini excavators, adding components such as throttle motor and controller not only makes space layout more difficult, but the increase in electrical components also brings a certain failure rate, requiring personnel with certain maintenance skills to handle. Summary of the Invention

[0005] In view of this, the present invention provides an engine electro-hydraulic control automatic idling system, method and engineering vehicle to solve the problem that existing automatic idling functions require the addition of a vehicle controller and throttle motor, resulting in high component costs and increased failure rates.

[0006] In a first aspect, the present invention provides an engine electro-hydraulic control automatic idling system. The system includes a hydraulic system, a throttle control system, an oil accumulator cylinder, a first pressure switch, a second pressure switch, a three-position four-way solenoid valve, and a battery. The battery provides current to the system. The throttle control system includes at least a first cylinder and an engine throttle. The first and second pressure switches are connected to pipelines in the hydraulic system, allowing the hydraulic system to control the on / off states of the first and second pressure switches based on the current operating state of the vehicle. The first pressure port of the three-position four-way solenoid valve is connected to the hydraulic system, the second return port is connected to the oil tank in the hydraulic system for guiding oil back to the tank, and the third working port is connected to the first cylinder. The fourth working oil port is connected to the oil storage cylinder; the first pressure switch is used to control the conduction state of the first pressure oil port and the third working oil port, and the conduction state of the second return oil port and the fourth working oil port; the second pressure switch is used to control the conduction state of the first pressure oil port and the fourth working oil port, and the conduction state of the second return oil port and the third working oil port; the hydraulic system feeds oil into the first oil cylinder through the first pressure oil port and the third working oil port, so that the piston in the first oil cylinder pushes the engine throttle to the idle position, and discharges the oil into the oil storage cylinder through the cavity port; the hydraulic system feeds oil into the oil storage cylinder through the first pressure oil port and the fourth working oil port, so that the piston in the oil storage cylinder moves, and the oil discharged from the first oil cylinder flows back to the first oil cylinder.

[0007] The present invention provides an electro-hydraulic control automatic idling system for an engine. The system includes a hydraulic system, a throttle control system, an oil accumulator cylinder, a first pressure switch, a second pressure switch, a three-position four-way solenoid valve, and a battery. The throttle control system includes at least a first oil cylinder and an engine throttle. The first and second pressure switches are connected to the hydraulic system's pipelines, allowing the hydraulic system to control the on / off states of the first and second pressure switches based on the current operating state of the vehicle. The three-position four-way solenoid valve has a first pressure port connected to the hydraulic system, a second return port connected to the oil tank in the hydraulic system for guiding oil back to the tank, a third working port connected to the first oil cylinder, and a fourth working port connected to the oil accumulator cylinder. The first pressure switch controls the conduction states of the first pressure port and the third working port, as well as the second return port and the fourth working port. The second pressure switch controls the conduction state of the first pressure port and the fourth working port, as well as the conduction state of the second return port and the third working port. The hydraulic system feeds oil into the first cylinder through the first pressure port and the third working port, causing the piston in the first cylinder to push the engine throttle to the idle position and discharge the oil into the accumulator through the cavity. The hydraulic system feeds oil into the accumulator through the first pressure port and the fourth working port, causing the piston in the accumulator to move and discharge the oil discharged from the first cylinder back into the first cylinder. This achieves quantitative control of the oil inflow and outflow in the cylinder cavity through electro-hydraulic combination, ensuring that the piston can maintain consistent reciprocating position even when it is in different positions. This enables the automatic idling function of the engineering vehicle engine, reduces costs, simplifies the layout, and eliminates the need to change the mechanical cables.

[0008] In one optional embodiment, the system further includes a first relay and a second relay, wherein the first relay has a first end connected to a battery, a second end connected to a first pressure switch, and a first output contact connected to the first side electromagnetic coil of a three-position four-way solenoid valve, forming a first current loop, used to control the first pressure port and the third working port to be connected, and the second return port and the fourth working port to be connected when the first current loop is open; the second relay has a first end connected to a battery, a second end connected to a second pressure switch, and a third output contact connected to the second side electromagnetic coil of a three-position four-way solenoid valve, forming a second current loop, used to control the first pressure port and the fourth working port to be connected, and the second return port and the third working port to be connected when the second current loop is open.

[0009] This invention installs a relay between the pressure switch and the three-position four-way solenoid valve, which can prevent frequent switching of the solenoid valve's conduction state caused by pressure fluctuations.

[0010] In one optional embodiment, the system further includes a first limit switch and a second limit switch, wherein the first limit switch is fixed at the engine throttle idle position and establishes a control connection with the first side solenoid coil of the three-position four-way solenoid valve, for controlling the conduction or de-energization state of the first current circuit based on the movement of the piston in the first cylinder; the second limit switch is connected to the piston in the oil accumulator cylinder and establishes a control connection with the second side solenoid coil of the three-position four-way solenoid valve, for controlling the conduction or de-energization state of the second current circuit based on the movement of the piston in the oil accumulator cylinder.

[0011] The first and second limit switches designed in this invention can automatically control the opening and closing of the corresponding current circuits according to the movement of the piston in the corresponding oil cylinder, thereby improving the automation level of the system and realizing precise adjustment of the state of the three-position four-way solenoid valve.

[0012] In one optional embodiment, the hydraulic system supplies oil to the rodless chamber of the first cylinder through a first pressure port and a third working port to control the piston in the first cylinder to push the engine throttle towards the idle position. Upon reaching the idle position, the first limit switch disconnects, controlling the first current circuit to open. The second limit switch establishes a contact-sensing connection with the piston in the accumulator cylinder, causing oil from the rod chamber of the first cylinder to be discharged and enter the rod chamber of the accumulator cylinder, controlling the piston movement in the accumulator cylinder and triggering the second stroke. When the switch is closed, the oil in the rodless chamber of the accumulator returns to the oil tank through the fourth working port and the second return port. The hydraulic system supplies oil to the rodless chamber of the accumulator through the first pressure port and the fourth working port to control the piston movement in the accumulator until the second limit switch is triggered and the second current circuit is disconnected. The oil discharged from the first cylinder and received in the rod chamber of the accumulator flows back to the rod chamber of the first cylinder. The oil in the rodless chamber of the first cylinder returns to the oil tank through the third working port and the second return port.

[0013] In this invention, the oil from the rod chamber side of the first hydraulic cylinder is discharged into the rod chamber side of the oil storage cylinder, establishing a connection between the piston movements of the two. This ensures that even when the piston in the hydraulic cylinder is in different positions, the reciprocating position of the piston remains consistent. The limit switch can accurately sense the position and stroke state of the piston, thereby achieving precise control and timely stopping of the hydraulic cylinder's movement.

[0014] In one optional embodiment, the system further includes a rocker switch and a fuse, wherein the first end of the rocker switch is connected to the battery and the second end is connected to the fuse, for controlling the current flow of the battery; the current output by the battery flows into the first relay and the second relay through the fuse.

[0015] In one alternative implementation, the first relay is a time-delay relay.

[0016] In one optional embodiment, the hydraulic system includes at least a load-sensitive pipeline and a safety-locking solenoid valve, wherein the load-sensitive pipeline is connected to a first pressure switch and a second pressure switch for controlling the switching states of the first and second pressure switches based on the detected pressure signal of the hydraulic system of the engineering vehicle; the hydraulic system supplies oil to the accumulator cylinder and the first cylinder through the safety-locking solenoid valve.

[0017] Secondly, the present invention provides an engine electro-hydraulic control automatic idling method, applied to the engine electro-hydraulic control automatic idling system of the first aspect above or any corresponding embodiment thereof, the method comprising: acquiring the current working state of the engineering vehicle; and controlling the switching states of a first pressure switch and a second pressure switch based on the current working state of the engineering vehicle.

[0018] In one optional implementation, the current working state of the engineering vehicle is determined based on the pressure in the load-sensitive line of the hydraulic system. The step of controlling the switching states of the first and second pressure switches based on the current working state of the engineering vehicle includes: if no pressure is detected in the load-sensitive line of the hydraulic system, indicating that the engineering vehicle is currently in a non-working state, the first pressure switch is controlled to be closed and the second pressure switch to be open; if pressure is detected in the load-sensitive line of the hydraulic system, indicating that the engineering vehicle is currently in a working state, the first pressure switch is controlled to be open and the second pressure switch to be closed.

[0019] Thirdly, the present invention provides an engineering vehicle, which includes an engine electro-hydraulic control automatic idling system and a controller. The controller includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the engine electro-hydraulic control automatic idling method of the second aspect or any corresponding embodiment described above. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a structural example diagram of an engine electro-hydraulic control automatic idling system according to an embodiment of the present invention;

[0022] Figure 2This is a structural example diagram of a three-dimensional four-way solenoid valve according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic flowchart of an engine electro-hydraulic control automatic idling method according to an embodiment of the present invention;

[0024] Figure 4 This is a structural schematic diagram of an engineering vehicle according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention.

[0026] In the diagram, the components are: 1. Throttle device; 2. Throttle cable; 3. Bracket; 4. Slide rail; 5. First cylinder; 6. Connecting rod; 7. First limit switch; 8. Oil accumulator cylinder; 9. Three-position four-way solenoid valve; 10. First pressure switch; 11. Second pressure switch; 12. Second relay; 13. Safety device; 14. Rocker switch; 15. Battery; 16. Safety locking solenoid valve; 17. Second limit switch; and 18. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. The present invention discloses an electro-hydraulic controlled automatic idling system for an engine, such as... Figure 1 As shown, the engine electro-hydraulic control automatic idle speed system includes a hydraulic system, a throttle control system, an oil accumulator cylinder 8, a first pressure switch 11, a second pressure switch 12, a three-position four-way solenoid valve 9, and a battery 16. The throttle control system includes at least a first oil cylinder 5 and an engine throttle.

[0031] The first pressure switch 11 and the second pressure switch 12 are connected to the hydraulic system pipelines so that the hydraulic system controls the on / off states of the first pressure switch 11 and the second pressure switch 12 based on the current working state of the engineering vehicle. The first pressure port of the three-position four-way solenoid valve 9 is connected to the hydraulic system, the second return port is connected to the oil tank in the hydraulic system to guide the oil back to the oil tank, the third working port is connected to the first oil cylinder 5, and the fourth working port is connected to the oil storage cylinder 8. The first pressure switch 11 is used to control the conduction state of the first pressure port and the third working port, and the conduction state of the second return port and the fourth working port. The working oil port is open; the second pressure switch 12 is used to control the open state of the first pressure oil port and the fourth working oil port, and the open state of the second return oil port and the third working oil port; the hydraulic system feeds oil into the first oil cylinder 5 through the first pressure oil port and the third working oil port, so that the piston in the first oil cylinder 5 pushes the engine throttle to the idle position and discharges the oil into the oil storage cylinder 8 through the cavity port; the hydraulic system feeds oil into the oil storage cylinder 8 through the first pressure oil port and the fourth working oil port, so that the piston in the oil storage cylinder 8 moves and returns the oil discharged from the first oil cylinder 5 back to the first oil cylinder 5.

[0032] like Figure 1As shown, the engine voltage-controlled automatic idling system designed in this embodiment of the invention includes a hydraulic system, a throttle control system, an oil accumulator cylinder 8, a first pressure switch 11, a second pressure switch 12, a three-position four-way solenoid valve 9, and a battery 16. The throttle control system includes at least a first oil cylinder 5 and an engine throttle. The hydraulic system includes, but is not limited to, a motor, oil cylinder, main valve, operating handle, oil tank, radiator, pump, accumulator, and safety locking solenoid valve 17. It can determine the working state of the engineering vehicle by detecting the pilot operating pressure or the main system pressure of the engineering vehicle. Because the oil tank, accumulator, and other components in the hydraulic system are always in a state of oil supply, they can supply oil to the oil accumulator cylinder 8 and the first oil cylinder 5 in the throttle control system, thereby achieving quantitative control of the oil inflow and outflow within the cylinder cavity and realizing the automatic idling function of the engineering vehicle engine. The door control system includes at least a throttle device 1, a throttle cable 2, a bracket 3, a slide rail 4, a first cylinder 5, and a connecting rod 6. The throttle device 1 is fixed to the control box of the engineering vehicle for easy adjustment of the throttle size. The throttle cable 2 connects the first cylinder 5 and the throttle device 1, and its two ends are fixed to the control box and the engine respectively using the fixed bracket 3. The slide rail 4 is fixed to the engine. The first cylinder 5 can slide on the slide rail 4 as the throttle cable 2 is pulled. The piston end of the first cylinder 5 is connected to the connecting rod 6 by a pin. The other end of the connecting rod 6 is connected to the engine throttle pin. The connecting rod 6 has a certain degree of rotational freedom to adapt to the rotation of the throttle. The specific throttle control principle is as follows: pushing the throttle device 1 causes the throttle cable 2 to be forced, which drives the first cylinder 5 to move freely on the slide rail 4, and drives the connecting rod 6 to push and pull the engine throttle to adjust the speed.

[0033] In this embodiment of the invention, the first pressure switch 11 and the second pressure switch 12 are connected to the pipeline of the hydraulic system so that the hydraulic system controls the opening and closing states of the first pressure switch 11 and the second pressure switch 12 respectively based on the detected working state of the engineering vehicle. The first pressure switch 11 is generally in a normally closed state, and the second pressure switch 12 is in a normally open state. When the hydraulic system detects that the engineering vehicle is not in operation, it can control the first pressure switch 11 to close and the second pressure switch 12 to open; or when it detects that the engineering vehicle is in operation, it can control the first pressure switch to open and the second pressure switch 12 to close. Figure 2As shown, the three-position four-way solenoid valve 9 includes three valve core working positions (including a first side (e.g., right side), a second side (e.g., left side), and a neutral position) and four ports (including a first pressure port (D), a second return port (F), a third working port (C), and a fourth working port (E)). The first pressure switch 11 is used to control the conduction state of the first pressure port and the third working port, and the conduction state of the second return port and the fourth working port. That is, when the first pressure switch 11 is closed, the first pressure port and the third working port are connected, and the second return port and the fourth working port are connected. The second pressure switch 12 is used to control the conduction state of the first pressure port and the fourth working port, and the conduction state of the second return port and the third working port. That is, when the second pressure switch 12 is closed, the first pressure port and the fourth working port are connected, and the second return port and the fourth working port are connected.

[0034] In this embodiment of the invention, when the first pressure switch 11 is closed and the second pressure switch 12 is open (the engineering vehicle is in a non-working state), the hydraulic system can supply oil to the rodless chamber side of the first cylinder 5 through the first pressure port and the third working port (i.e., D→C). This causes the piston in the first cylinder 5 to move the connecting rod 6 towards the idle position due to the oil supply, until the engine throttle reaches the idle position, thus realizing the automatic idle function of the engine. At this time, the piston movement in the first cylinder 5 causes oil to be discharged outward from the rod-side chamber. The closed chambers of the first cylinder 5 and the accumulator cylinder 8 can be designed to be filled with oil through a screw plug or similar means. That is, the oil in the first cylinder 5 is discharged through port A and enters the rod-side chamber of the accumulator cylinder 8 through port B. The rodless chamber of the accumulator cylinder 8... Oil on the rod side returns to the oil tank through the fourth working port and the second return port (E→F). When the second pressure switch 12 is closed and the first pressure switch 11 is open (the engineering vehicle is in working condition), the hydraulic system can supply oil to the rodless side of the accumulator cylinder 8 through the first pressure port and the fourth working port (D→E). The piston in the accumulator cylinder 8 moves, causing the oil discharged from the first cylinder 5 received in the rod side to flow back to the rod side of the first cylinder 5 through the B port and the A port. This causes the piston in the first cylinder 5 to move back to its original position based on the returned oil, thus returning the throttle to its original working position. Oil on the rodless side of the first cylinder 5 returns to the oil tank through the third working port and the second return port (C→F).

[0035] The present invention provides an electro-hydraulic control automatic idling system for an engine. The system includes a hydraulic system, a throttle control system, an oil accumulator cylinder, a first pressure switch, a second pressure switch, a three-position four-way solenoid valve, and a battery. The throttle control system includes at least a first oil cylinder and an engine throttle. The first and second pressure switches are connected to the hydraulic system's pipelines, allowing the hydraulic system to control the on / off states of the first and second pressure switches based on the current operating state of the vehicle. The three-position four-way solenoid valve has a first pressure port connected to the hydraulic system, a second return port connected to the oil tank in the hydraulic system for guiding oil back to the tank, a third working port connected to the first oil cylinder, and a fourth working port connected to the oil accumulator cylinder. The first pressure switch controls the conduction states of the first pressure port and the third working port, as well as the second return port and the fourth working port. The second pressure switch controls the conduction state of the first pressure port and the fourth working port, as well as the conduction state of the second return port and the third working port. The hydraulic system feeds oil into the first cylinder through the first pressure port and the third working port, causing the piston in the first cylinder to push the engine throttle to the idle position and discharge the oil into the accumulator through the cavity. The hydraulic system feeds oil into the accumulator through the first pressure port and the fourth working port, causing the piston in the accumulator to move and discharge the oil discharged from the first cylinder back into the first cylinder. This achieves quantitative control of the oil inflow and outflow in the cylinder cavity through electro-hydraulic combination, ensuring that the piston can maintain consistent reciprocating position even when it is in different positions. This enables the automatic idling function of the engineering vehicle engine, reduces costs, simplifies the layout, and eliminates the need to change the mechanical cables.

[0036] In one optional embodiment, the system further includes a first relay and a second relay, wherein the first end of the first relay is connected to a battery, the second end is connected to a first pressure switch, and the first output contact is connected to the first side electromagnetic coil of a three-position four-way solenoid valve, forming a first current loop, used to control the first pressure port and the third working port to be connected, and the second return port and the fourth working port to be connected when the first current loop is turned on; the first end of the second relay is connected to a battery, the second end is connected to a second pressure switch, and the third output contact is connected to the second side electromagnetic coil of a three-position four-way solenoid valve, forming a second current loop, used to control the first pressure port and the fourth working port to be connected, and the second return port and the third working port to be connected when the second current loop is turned on.

[0037] In this embodiment of the invention, the first relay 10 has its first end connected to a storage battery 16, its second end connected to a first pressure switch 11, and its first output contact connected to the first side electromagnetic coil of a three-position four-way solenoid valve 9, forming a first current loop. The relay is an electromagnetic switch, mainly composed of an electromagnetic system and a contact system. When the control coil of the relay is energized, according to the magnetic effect of the current, the coil generates a magnetic field, causing the magnetized iron core to generate electromagnetic force, attracting the armature to move. This, in turn, causes a state change in the connected contacts, energizing the corresponding side electromagnetic coil of the three-position four-way solenoid valve. When the first pressure switch 11 is closed, the first current loop is opened. When the valve is in operation, the first electromagnetic coil of the three-position four-way solenoid valve 9 is energized, and the valve core moves to the first side under the action of electromagnetic force. At this time, the first pressure port, the third working port, the second return port, and the fourth working port are all connected. The first end of the second relay 13 is connected to the battery 16, the second end is connected to the second pressure switch 12, and the second output contact is connected to the second electromagnetic coil of the three-position four-way solenoid valve 9, forming a second current circuit. When the second current circuit is connected, the second electromagnetic coil corresponding to the second electromagnetic coil is energized, and the valve core moves to the second side under the action of electromagnetic force. The first pressure port, the fourth working port, the third working port, and the second return port are all connected.

[0038] In some optional embodiments, the system further includes a first limit switch 7 and a second limit switch 18, wherein the first limit switch 7 is fixed at the engine throttle idle position and establishes a control connection with the first side solenoid coil of the three-position four-way solenoid valve 9, for controlling the conduction or de-energization state of the first current circuit based on the movement of the piston in the first cylinder 5; the second limit switch 18 is connected to the piston in the oil storage cylinder 8 and establishes a control connection with the second side solenoid coil of the three-position four-way solenoid valve 9, for controlling the conduction or de-energization state of the second current circuit based on the movement of the piston in the oil storage cylinder 8.

[0039] like Figure 1As shown, the first limit switch 7 is fixed at the engine throttle idle position so that when the engine throttle is in the idle state, a trigger mechanism is activated to execute the corresponding control action. The first limit switch 7 establishes a control connection with the first-side solenoid coil of the three-position four-way solenoid valve 9 to control the conduction or de-energization of the first current circuit. For example, the first limit switch 7 is initially in the closed state. When the engine throttle is detected to be in the idle state, the first limit switch 7 opens, causing the first current circuit to disconnect, and the valve core of the three-position four-way solenoid valve 9 returns to the neutral position. The second limit switch... Switch 18 is connected to the piston in the oil storage cylinder 8 so as to sense the position change or movement of the piston, thereby acting as a trigger mechanism to execute corresponding control actions (such as opening and closing), and then controlling the conduction or de-energization state of the second current circuit. For example, the second limit switch 18 is initially in the open state. When oil in the first oil cylinder 5 enters the oil storage cylinder 8, the piston in the oil storage cylinder 8 moves to the rodless chamber side, away from the second limit switch 18, triggering the second limit switch 18 to close, so that the second current circuit is turned on when the second pressure switch 12 is in the closed state.

[0040] The first and second limit switches designed in this invention can automatically control the opening and closing of the corresponding current circuits according to the movement of the piston in the corresponding oil cylinder, thereby improving the automation level of the system and realizing precise adjustment of the state of the three-position four-way solenoid valve.

[0041] Specifically, the hydraulic system supplies oil to the rodless chamber of the first cylinder 5 through the first pressure port and the third working port to control the piston in the first cylinder 5 to push the engine throttle towards the idle position. When the idle position is reached, the first limit switch 7 opens, controlling the first current circuit to disconnect. The second limit switch 18 establishes a contact connection with the piston in the accumulator cylinder 8, causing oil from the rod chamber of the first cylinder 5 to be discharged and enter the rod chamber of the accumulator cylinder 8 to control the piston movement in the accumulator cylinder 8, triggering the second limit switch 7 to close. Oil from the rodless side of the accumulator cylinder 8 returns to the oil tank through the fourth working port and the second return port. The hydraulic system supplies oil to the rodless side of the accumulator cylinder 8 through the first pressure port and the fourth working port to control the piston movement in the accumulator cylinder 8 until the second limit switch 18 is triggered to open, the second current circuit is disconnected, and the oil discharged from the first cylinder 5 received in the rod side of the accumulator cylinder 8 flows back to the rod side of the first cylinder 5. Oil from the rodless side of the first cylinder 5 returns to the oil tank through the third working port and the second return port.

[0042] In this embodiment of the invention, the first limit switch 7 is initially in a closed state. When the engineering vehicle is detected to be in a non-working state, the first pressure switch 11 is controlled to be in a closed state, the first current circuit is turned on, the three-position four-way solenoid valve 9 is in the first side position, and the hydraulic system supplies oil to the rodless chamber side of the first cylinder 5 through the first pressure oil port and the third working oil port. The piston in the first cylinder 5 extends and pushes the engine throttle to the idle position. When the engine throttle reaches the idle position, the first limit switch 7 is triggered to open, the first current circuit is de-energized, and the valve core of the three-position four-way solenoid valve 9 returns to the neutral position. At this time, the engine throttle remains at the idle position. During the above process, the oil in the rod chamber side of the first cylinder 5 is discharged and all enters the rod chamber side of the oil storage cylinder 8. The piston in the oil storage cylinder 8 moves to the rodless chamber side. Since the piston moves to the rodless chamber side, the oil in the corresponding rodless chamber side can return to the oil tank through the fourth working oil port and the second return oil port. The piston leaves the second limit switch 18, triggering the second limit switch 18 to close. Initially in the off state, this facilitates the conduction of the second current circuit when the second pressure switch 12 is closed. When the operator operates the engineering vehicle and detects that the vehicle is in operation, the second pressure switch 12 is closed, the second current circuit is activated, and the three-position four-way solenoid valve 9 opens to the second side position. The first pressure port and the fourth working port are connected, as are the second return port and the third working port. The hydraulic system supplies oil to the rodless chamber side of the accumulator cylinder 8 through the first pressure port and the fourth working port, pushing the piston to move towards the rod chamber side until it contacts the second limit switch 18, triggering the second limit switch 18 to open. The second current circuit is de-energized, and the valve core of the three-position four-way solenoid valve 9 returns to the neutral position. At this time, the oil discharged from the first cylinder 5 received in the rod chamber side of the accumulator cylinder 8 returns to the rod chamber side of the accumulator cylinder 8, and the throttle returns to its original working position. The oil in the rodless chamber side of the first cylinder 5 can return to the oil tank in the hydraulic system through the third working port and the second return port.

[0043] In this invention, the oil from the rod chamber side of the first hydraulic cylinder is discharged into the rod chamber side of the oil storage cylinder, establishing a connection between the piston movements of the two. This ensures that even when the piston in the hydraulic cylinder is in different positions, the reciprocating position of the piston remains consistent. The limit switch can accurately sense the position and stroke state of the piston, thereby achieving precise control and timely stopping of the hydraulic cylinder's movement.

[0044] In some optional embodiments, the system further includes a rocker switch 15 and a safety device 14, wherein the first end of the rocker switch 15 is connected to the battery 16 and the second end is connected to the safety device 14, for controlling the current flow of the battery 16; the current output by the battery 16 flows into the first relay 10 and the second relay 13 through the safety device 14.

[0045] The engine electro-hydraulic control automatic idling system designed in this embodiment of the invention also includes a rocker switch 15 and a safety device 14, such as... Figure 1 As shown, the first end of the rocker switch 15 is connected to the battery 16, and the second end is connected to the fuse device 14. Only when the operator presses the rocker switch 15 will the engine's automatic idle function be activated, allowing current from the battery 16 to flow to the first relay 10 and the second relay 13. If the automatic idle function is not activated, both the first and second current circuits are disconnected. The rocker switch 15 can be placed on the control box, facilitating the operator's selection of the idle function. This allows the operator to flexibly decide whether to activate the idle function based on actual needs, enhancing the controllability of the vehicle operation and making the vehicle's operation more in line with actual working conditions and safety requirements. One end of the fuse device 14 is connected to the rocker switch 15, and the other end is connected to the first relay 10 and the second relay 13. The current output from the battery 16 flows through the rocker switch 15 and the fuse device 14 into the first relay 10 and the second relay 13, preventing circuit overload damage and extending the system's service life.

[0046] Specifically, the first relay 10 is a time-delay relay. The first relay 10 designed in this embodiment of the invention is a time-delay relay, which can prevent the vehicle from immediately entering the idling state after detecting that the vehicle is in a non-working state, thereby reducing the impact and wear caused by sudden idling and improving the service life and reliability of the engineering vehicle.

[0047] Specifically, the hydraulic system includes at least a load-sensitive pipeline and a safety-locking solenoid valve 17. The load-sensitive pipeline is connected to a first pressure switch 11 and a second pressure switch 12 to control the switching state of the first pressure switch 11 and the second pressure switch 12 based on the detected pressure signal of the hydraulic system of the engineering vehicle. The hydraulic system supplies oil to the oil storage cylinder 8 and the first cylinder 5 through the safety-locking solenoid valve 17.

[0048] The hydraulic system designed in this embodiment of the invention includes at least a load-sensitive line and a safety locking solenoid valve 17, such as... Figure 1 As shown, the load-sensitive pipeline is a load-sensitive LS pipeline, which is connected to the first pressure switch 11 and the second pressure switch 12. Based on the detected pressure signal of the hydraulic system of the engineering vehicle, the switching states of the first pressure switch 11 and the second pressure switch 12 are controlled. For example, when there is no pressure in the load-sensitive LS pipeline, it indicates that the engineering vehicle is in a non-working state, and the first pressure switch 11 can be controlled to close and the second pressure switch 12 to open. When there is pressure in the load-sensitive LS pipeline, it indicates that the engineering vehicle is in a working state, and the first pressure switch 11 can be controlled to open and the second pressure switch 12 to close. The oil-filled equipment in the hydraulic system supplies oil to the oil storage cylinder 8 and the first oil cylinder 5 through the safety locking solenoid valve 17.

[0049] According to an embodiment of the present invention, a thermal management method embodiment is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0050] This embodiment provides an engine electro-hydraulic control automatic idling method, which can be used in the engine electro-hydraulic control automatic idling system described in the above embodiments. Figure 3 This is a flowchart of an engine electro-hydraulic control automatic idling method according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps:

[0051] Step S301: Obtain the current working status of the engineering vehicle.

[0052] Step S302: Based on the current working state of the engineering vehicle, control the switching states of the first pressure switch and the second pressure switch.

[0053] This invention can obtain the current working status of the engineering vehicle, i.e., whether it is in working condition, through vehicle monitoring system or sensor detection. Based on the working status of the engineering vehicle, the switching states of the first pressure switch and the second pressure switch are controlled respectively, thereby controlling the conduction of the first current circuit or the second current circuit. For example, if it is determined that the engineering vehicle is currently in a non-working state, the first pressure switch can be closed and the second pressure switch can be opened to realize the conduction of the first current circuit. The hydraulic system feeds oil into the first cylinder through the first pressure oil port and the third working oil port, controlling the piston in the first cylinder to push the engine throttle to the idle position. If it is determined that the engineering vehicle is currently in a working state, the first pressure switch can be opened and the second pressure switch can be closed to realize the conduction of the second current circuit. The hydraulic system feeds oil into the oil storage cylinder through the first pressure oil port and the fourth working oil port, controlling the oil discharged from the first cylinder received in the oil storage cylinder to return to the first cylinder, so that the engine throttle returns to the original working position.

[0054] The automatic idling method for engine electro-hydraulic control provided by the present invention obtains the current working state of the engineering vehicle, and controls the switching states of the first pressure switch and the second pressure switch based on the current working state of the engineering vehicle to realize the automatic idling function of the engine.

[0055] Specifically, the current working state of the engineering vehicle is determined based on the pressure in the load-sensitive line of the hydraulic system. If no pressure is detected in the load-sensitive line of the hydraulic system, it indicates that the engineering vehicle is currently in a non-working state, and the first pressure switch is controlled to be closed and the second pressure switch is controlled to be open. If pressure is detected in the load-sensitive line of the hydraulic system, it indicates that the engineering vehicle is currently in a working state, and the first pressure switch is controlled to be open and the second pressure switch is controlled to be closed.

[0056] In this embodiment of the invention, if no pressure is detected in the load-sensitive pipeline of the hydraulic system, indicating that the engineering vehicle is currently in a non-operating state, the first pressure switch is closed and the second pressure switch is open. Battery current flows through the fuse device and the first relay to the first pressure switch, completing the first current circuit. The first relay engages after a delay of several seconds (selectable as needed, typically 4-6 seconds), opening the three-position four-way solenoid valve to the first side position. The hydraulic system then supplies oil to the rodless chamber side of the first cylinder through the first pressure port and the third working port. The piston extends and pushes the engine throttle towards the idle position until the engine throttle reaches the idle position. At this point, the first limit switch is disconnected, the first current circuit is de-energized, and the three-position four-way solenoid valve returns to the neutral position. At this time, the throttle remains at the idle position. During the above process, all the oil discharged from the rod chamber side of the first cylinder enters the rod chamber side of the accumulator cylinder. The piston in the accumulator cylinder moves towards the rodless chamber side and leaves the second limit switch. The second limit switch switches to the closed state. The oil in the rodless chamber side of the accumulator cylinder can return to the oil tank in the hydraulic system through the fourth working oil port and the second return oil port.

[0057] When pressure is detected in the load-sensitive pipeline of the hydraulic system, it indicates that the engineering vehicle is currently in the working state. The first pressure switch is in the open state, and the second pressure switch is in the closed state. The battery current passes through the fuse device and the second relay to the second pressure switch, the second current circuit is connected, the second relay is energized, and the three-position four-way solenoid valve opens to the second side position. The hydraulic system feeds oil into the rodless chamber of the accumulator cylinder through the first pressure port and the fourth working port, pushing the piston to move towards the rod chamber until it contacts the second limit switch, triggering the second limit switch to the open state. The second current circuit is de-energized, and the three-position four-way solenoid valve returns to the neutral position. At this time, the oil that entered the rod chamber of the accumulator cylinder returns to the rod chamber of the first cylinder, so that the engine throttle returns to its original working position. The oil in the rodless chamber of the first cylinder can return to the oil tank of the hydraulic system through the third working port and the second return port.

[0058] This embodiment also provides an engineering vehicle, such as Figure 4As shown, the engineering vehicle includes an engine electro-hydraulic control automatic idling system and a controller. The controller includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the engine electro-hydraulic control automatic idling method described in the above embodiments.

[0059] Specifically, the engineering vehicle can be an excavator.

[0060] Please see Figure 5 , Figure 5 This is a schematic diagram of the structure of a computer device provided in an optional embodiment of the present invention, such as... Figure 5 As shown, the computer device includes one or more processors 110, memory 120, and interfaces for connecting the components, including high-speed interfaces and low-speed interfaces. The components communicate with each other via different buses and can be mounted on a common motherboard or otherwise installed as needed. The processors can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on external input / output devices (such as display devices coupled to the interfaces). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 5 Take a processor 110 as an example.

[0061] Processor 110 may be a central processing unit, a network processor, or a combination thereof. Processor 110 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CLP), a field-programmable gate array (FPGA), a general-purpose array logic (GPRS), or any combination thereof.

[0062] The memory 120 stores instructions executable by at least one processor 110 to cause the at least one processor 110 to perform the method shown in the above embodiments.

[0063] The memory 120 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 120 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 120 may optionally include memory remotely located relative to the processor 110, and these remote memories may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0064] The memory 120 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 120 may also include a combination of the above types of memory.

[0065] The computer device also includes a communication interface 130 for communicating with other devices or communication networks.

[0066] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0067] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0068] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and all such modifications and variations fall within the defined scope.

Claims

1. An electro-hydraulic control automatic idle system of an engine, characterized by comprising: The system comprises a hydraulic system, a throttle control system, an oil storage cylinder, a first pressure switch, a second pressure switch, a three-position four-way electromagnetic valve and a battery, the battery provides current for the system, the throttle control system comprises at least a first oil cylinder and an engine throttle, wherein, The first pressure switch and the second pressure switch are connected with pipelines of the hydraulic system, so that the hydraulic system controls the switch state of the first pressure switch and the second pressure switch based on the current working state of the engineering vehicle; The first pressure oil port of the three-position four-way electromagnetic valve is connected with the hydraulic system, the second return oil port is communicated with an oil tank in the hydraulic system and is used for guiding oil to return to the oil tank, the third working oil port is communicated with the first oil cylinder, and the fourth working oil port is communicated with the oil storage cylinder; The first pressure switch is used for controlling the conduction state of the first pressure oil port and the third working oil port and the conduction state of the second return oil port and the fourth working oil port; The second pressure switch is used for controlling the conduction state of the first pressure oil port and the fourth working oil port and the conduction state of the second return oil port and the third working oil port; The hydraulic system supplies oil to the first oil cylinder through the first pressure oil port and the third working oil port, so that the piston in the first oil cylinder pushes the engine throttle to move to the idle position and the discharged oil enters the oil storage cylinder through the cavity port; The hydraulic system supplies oil to the oil storage cylinder through the first pressure oil port and the fourth working oil port, so that the piston in the oil storage cylinder moves and the received oil discharged from the first oil cylinder is returned to the first oil cylinder; The system further comprises a first relay and a second relay, wherein, The first end of the first relay is connected with the battery, the second end is connected with the first pressure switch, the first output contact is connected with the first side electromagnetic coil of the three-position four-way electromagnetic valve, and a first current loop is formed, which is used for controlling the first pressure oil port and the third working oil port to be conducted and the second return oil port and the fourth working oil port to be conducted when the first current loop is conducted; The first end of the second relay is connected with the battery, the second end is connected with the second pressure switch, the third output contact is connected with the second side electromagnetic coil of the three-position four-way electromagnetic valve, and a second current loop is formed, which is used for controlling the first pressure oil port and the fourth working oil port to be conducted and the second return oil port and the third working oil port to be conducted when the second current loop is conducted.

2. The system of claim 1, wherein, The system further comprises a first travel switch and a second travel switch, wherein, The first travel switch is fixed at the idle position of the engine throttle and is connected with the first side electromagnetic coil of the three-position four-way electromagnetic valve to control the conduction or power-off state of the first current loop based on the movement of the piston in the first oil cylinder; The second travel switch is connected with the piston in the oil storage cylinder and is connected with the second side electromagnetic coil of the three-position four-way electromagnetic valve to control the conduction or power-off state of the second current loop based on the movement of the piston in the oil storage cylinder.

3. The system of claim 2, wherein, The hydraulic system supplies oil to the rodless cavity side of the first oil cylinder through the first pressure oil port and the third working oil port to control the piston in the first oil cylinder to push the engine throttle to move to the idle position, and when the idle position is reached, the first travel switch is turned off to control the first current loop to be turned off. The second travel switch is in contact sensing connection with the piston in the oil storage cylinder, and the oil in the rod cavity side of the first oil cylinder is discharged and enters the rod cavity side of the oil storage cylinder to control the piston in the oil storage cylinder to move and trigger the second travel switch to close, wherein the oil in the rodless cavity side of the oil storage cylinder returns to the oil tank through the fourth working oil port and the second return oil port. The hydraulic system supplies oil to the rodless cavity side of the oil storage cylinder through the first pressure oil port and the fourth working oil port to control the piston in the oil storage cylinder to move until the second travel switch is triggered to open, the second current loop is disconnected, and the oil received in the rod cavity side of the oil storage cylinder returns to the rod cavity side of the first oil cylinder, wherein the oil in the rodless cavity side of the first oil cylinder returns to the oil tank through the third working oil port and the second return oil port.

4. The system of claim 1, wherein, The system further comprises a rocker switch and a safety device, wherein, The first end of the rocker switch is connected with the battery, and the second end is connected with the safety device, for controlling the flow state of the current of the battery. The current output by the battery flows into the first relay and the second relay through the safety device.

5. The system of claim 1, wherein, The first relay is a time delay relay.

6. The system of claim 1, wherein, The hydraulic system at least comprises a load sensing pipeline and a safety locking solenoid valve, wherein, The load sensing pipeline is connected with the first pressure switch and the second pressure switch, for controlling the switching state of the first pressure switch and the second pressure switch based on the detected pressure signal of the hydraulic system of the engineering vehicle; The hydraulic system supplies oil to the oil storage cylinder and the first oil cylinder through the safety locking solenoid valve.

7. An engine electro-hydraulic control automatic idle method, characterized by, The method is applied to the engine electro-hydraulic control automatic idle speed system of any one of claims 1-6, and the method comprises: Obtaining the current working state of the engineering vehicle; Controlling the switching state of the first pressure switch and the second pressure switch based on the current working state of the engineering vehicle.

8. The method of claim 7, wherein, The controlling of the switching state of the first pressure switch and the second pressure switch based on the current working state of the engineering vehicle comprises: If no pressure is detected in the load sensing pipeline of the hydraulic system, it indicates that the current working state of the engineering vehicle is the non-working state, and the first pressure switch is controlled to be in the closed state and the second pressure switch is controlled to be in the open state; If pressure is detected in the load sensing pipeline of the hydraulic system, it indicates that the current working state of the engineering vehicle is the working state, and the first pressure switch is controlled to be in the open state and the second pressure switch is controlled to be in the closed state.

9. An engineering vehicle characterised in that, The engineering vehicle comprises an engine electro-hydraulic control automatic idle speed system and a controller, and the controller comprises: A memory and a processor, which are in communication connection with each other, and the memory stores computer instructions, and the processor executes the computer instructions to perform the engine electro-hydraulic control automatic idle speed method of any one of claims 7-8.

10. The engineering vehicle of claim 9, wherein the engineering vehicle is an excavator.

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