Engine electro-hydraulic control automatic idling system and method and engineering vehicle

Abstract

The invention relates to the technical field of idle speed control, and discloses an engine electro-hydraulic control automatic idle speed system and method and an engineering van. A first pressure switch and a second pressure switch are connected with a hydraulic system, and the first pressure switch is used for controlling connection of a first pressure oil port and a third working oil port of a three-position four-way electromagnetic valve; the second pressure switch is used for controlling conduction of a first pressure oil port and a fourth working oil port of the three-position four-way electromagnetic valve, the hydraulic system feeds oil into the first oil cylinder through the first pressure oil port and the third working oil port, a piston in the first oil cylinder pushes an engine throttle to move towards an idling position, and discharged oil enters the oil storage oil cylinder through a cavity port. The hydraulic system feeds oil into the oil storage oil cylinder through the first pressure oil port and the fourth working oil port, so that a piston in the oil storage oil cylinder moves, the received oil discharged by the first oil cylinder flows back to the first oil cylinder, quantitative control over oil inlet and outlet in an oil cylinder cavity is achieved in an electro-hydraulic combination mode, and consistency of the reciprocating position to the piston is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of idle speed control, and particularly to an engine electro-hydraulic control automatic idle speed system, method and engineering vehicle. Background Art

[0002] The automatic idle speed of an excavator is an energy-saving device that automatically detects the working state of the excavator. After the engine stops working for 4 - 6 seconds, it controls the engine throttle to enter the idle speed from the high speed. When the driver operates the excavator to start working, the engine throttle automatically returns to the working speed before the idle speed.

[0003] The working principle of the existing automatic idle speed device may include that a mechanical throttle engine drives the throttle cable to adjust the engine speed by adding a vehicle electronic control unit (VECU) and a throttle motor. The realization of its automatic idle speed function is to detect the working pressure of the excavator through a pressure switch or a pressure sensor. When the driver does not operate the handle, the pressure is too small to activate the pressure switch or sensor, and the signal is output to the controller to adjust the engine to enter the idle speed or the working speed.

[0004] However, the existing implementation of the automatic idle speed function requires adding a vehicle controller and a throttle motor, and the adjustment of the engine speed is changed to an electronic potentiometer knob, resulting in high costs; the conversion of the motor angle to stroke control is the number of pulse signals, with a small requirement for the dead stroke of the throttle cable and high manufacturing precision. For a small excavator, adding components such as a throttle motor and a controller not only makes the space layout difficult, but also the increase in electrical components brings a certain failure rate and requires 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 idle speed system, method and engineering vehicle to solve the problem that the existing implementation of the automatic idle speed function requires adding a vehicle controller and a 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 idle speed system. The system includes a hydraulic system, a throttle control system, an oil storage cylinder, a first pressure switch, a second pressure switch, a three-position four-way solenoid valve, and a storage battery. The storage battery supplies current to the system. The throttle control system includes at least a first oil cylinder and an engine throttle. Among them, the first pressure switch and the second pressure switch are connected to the pipeline of the hydraulic system, so that the hydraulic system controls the switch states 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 solenoid valve is connected to the hydraulic system, the second oil return port is communicated with the oil tank in the hydraulic system for guiding the oil to return to the oil tank, the third working oil port is connected to the first oil cylinder, and the fourth working oil port is connected to the oil storage cylinder. The first pressure switch is used to control the conduction states of the first pressure oil port and the third working oil port, and the conduction states of the second oil return port and the fourth working oil port. The second pressure switch is used to control the conduction states of the first pressure oil port and the fourth working oil port, and the conduction states of the second oil return 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 move to the idle position, and the discharged oil enters the oil storage cylinder through the cavity. 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 received from the discharge of the first oil cylinder flows back to the first oil cylinder again.

[0007] The engine electro-hydraulic control automatic idle speed system provided by the present invention is designed with a system including a hydraulic system, a throttle control system, an oil storage cylinder, a first pressure switch, a second pressure switch, a three-position four-way solenoid valve, and a storage battery. The throttle control system at least includes a first oil cylinder and an engine throttle. Among them, the first pressure switch and the second pressure switch are connected to the pipeline of the hydraulic system, so that the hydraulic system controls the switch states 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 solenoid valve is connected to the hydraulic system, the second oil return port is communicated with the oil tank in the hydraulic system for guiding the oil fluid back to the oil tank, the third working oil port is connected to the first oil cylinder, and the fourth working oil port is connected to the oil storage cylinder. The first pressure switch is used to control the conduction states of the first pressure oil port and the third working oil port, and the second oil return port and the fourth working oil port. The second pressure switch is used to control the conduction states of the first pressure oil port and the fourth working oil port, and the second oil return 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 towards 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 received is re-flowed back to the first oil cylinder, realizing a quantitative control of the oil inlet and outlet in the oil cylinder cavity in an electro-hydraulic combined manner, ensuring the consistency of the piston's round-trip position even when the piston in the oil cylinder is in different positions, thereby realizing the automatic idle speed function of the engineering vehicle engine, with reduced cost, simple layout, and no need to change the mechanical cable.

[0008] In an optional embodiment, the system further includes a first relay and a second relay. Among them, the first end of the first relay is connected to the storage battery, the second end is connected to the first pressure switch, and the first output contact is connected to the first-side electromagnetic coil of the three-position four-way solenoid valve, constituting a first current loop for controlling the conduction of the first pressure oil port and the third working oil port, and the second oil return port and the fourth working oil port when the first current loop is conducting; the first end of the second relay is connected to the storage battery, the second end is connected to the second pressure switch, and the third output contact is connected to the second-side electromagnetic coil of the three-position four-way solenoid valve, constituting a second current loop for controlling the conduction of the first pressure oil port and the fourth working oil port, and the second oil return port and the third working oil port when the second current loop is conducting.

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

[0010] In an alternative embodiment, the system further includes a first travel switch and a second travel switch. Among them, the first travel switch is fixed at the engine throttle idle position and is in control connection with the first-side electromagnetic coil of the three-position four-way solenoid valve, and is used to control the on or off state of the first current circuit based on the movement of the piston in the first oil cylinder; the second travel switch is connected to the piston in the oil storage cylinder and is in control connection with the second-side electromagnetic coil of the three-position four-way solenoid valve, and is used to control the on or off state of the second current circuit based on the movement of the piston in the oil storage cylinder.

[0011] The first travel switch and the second travel switch designed in the present invention can respectively automatically control the on and off of the corresponding current circuits according to the movement of the pistons in the corresponding oil cylinders, improving the automation degree of the system and realizing the precise adjustment of the state of the three-position four-way solenoid valve.

[0012] In an alternative embodiment, the hydraulic system feeds oil into 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 towards the idle position. When the idle position is reached, the first travel switch disconnects, controlling the first current circuit to disconnect; the second travel switch is in contact induction connection with the piston in the oil storage cylinder. The oil on the rod side of the first oil cylinder is discharged and enters the rod side of the oil storage cylinder to control the movement of the piston in the oil storage cylinder, triggering the second travel switch to close. Among them, the oil on the rodless cavity side of the oil storage cylinder returns to the fuel tank through the fourth working oil port and the second oil return port; the hydraulic system feeds oil into 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 disconnect and the second current circuit is disconnected. The oil received from the first oil cylinder discharged on the rod side of the oil storage cylinder flows back to the rod side of the first oil cylinder again. Among them, the oil on the rodless cavity side of the first oil cylinder returns to the fuel tank through the third working oil port and the second oil return port.

[0013] The oil on the rod side of the first oil cylinder in the present invention is discharged and enters the rod side of the oil storage cylinder, establishing an association between the movements of the pistons of the two, ensuring the consistency of the reciprocating positions of the pistons even when they are in different positions. The travel switch can accurately sense the position and travel state of the piston, thereby realizing the precise control and timely stop of the oil cylinder action.

[0014] In an alternative embodiment, the system further includes a rocker switch and a fuse device. Among them, the first end of the rocker switch is connected to the battery, and the second end is connected to the fuse device, and is used to control the on-off state of the battery current; the current output by the battery flows into the first relay and the second relay through the fuse device.

[0015] In an alternative embodiment, the first relay is a time-delay relay.

[0016] In an alternative embodiment, the hydraulic system at least includes a load-sensing pipeline and a safety locking solenoid valve. Among them, the load-sensing pipeline is connected to a first pressure switch and a second pressure switch, and is used to control the switching states 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 feeds oil to the oil storage cylinder and the first cylinder through the safety locking solenoid valve.

[0017] Second, the present invention provides an engine electro-hydraulic control automatic idle method, which is applied to the engine electro-hydraulic control automatic idle system of the first aspect or any corresponding embodiment thereof. The method includes: obtaining the current working state of the engineering vehicle; controlling the switching states of the first pressure switch and the second pressure switch based on the current working state of the engineering vehicle.

[0018] In an alternative embodiment, the current working state of the engineering vehicle is determined based on the pressure in the load-sensing line in the hydraulic system. The controlling the switching states of the first pressure switch and the second pressure switch based on the current working state of the engineering vehicle includes: if it is detected that there is no pressure in the load-sensing pipeline of the hydraulic system, it means that the current working state of the engineering vehicle is a non-working state, and the first pressure switch is controlled to be in a closed state and the second pressure switch is in an open state; if it is detected that there is pressure in the load-sensing pipeline of the hydraulic system, it means that the current working state of the engineering vehicle is a working state, and the first pressure switch is controlled to be in an open state and the second pressure switch is in a closed state.

[0019] Third, the present invention provides an engineering vehicle, which includes an engine electro-hydraulic control automatic idle system and a controller. The controller includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to execute the engine electro-hydraulic control automatic idle method of the second aspect or any corresponding embodiment thereof. Description of the Drawings

[0020] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

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

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

[0023] Figure 3 It is a schematic flow diagram of an engine electro-hydraulic control automatic idle speed method according to an embodiment of the present invention;

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

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

[0026] In the figure, there are throttle device 1, throttle cable 2, bracket 3, slide rail 4, first oil cylinder 5, connecting rod 6, first travel switch 7, oil storage cylinder 8, three-way four-way solenoid valve 9, first relay 10, first pressure switch 11, second pressure switch 12, second relay 13, safety device 14, rocker switch 15, storage battery 16, safety locking solenoid valve 17, second travel switch 18. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can also be the communication inside two elements. It can be a wireless connection or a wired connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

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

[0031] Among them, 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 switch 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 oil port of the three-position four-way solenoid valve 9 is connected to the hydraulic system, the second oil return port is communicated with the oil tank in the hydraulic system for guiding the oil fluid back to the oil tank, the third working oil port is communicated with the first oil cylinder 5, and the fourth working oil port is communicated with the oil storage cylinder 8; the first pressure switch 11 is used to control the conduction states of the first pressure oil port and the third working oil port, and the conduction states of the second oil return port and the fourth working oil port; the second pressure switch 12 is used to control the conduction states of the first pressure oil port and the fourth working oil port, and the conduction states of the second oil return 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 move to the idle position, and discharges the oil through the cavity into the oil storage cylinder 8; 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 the oil discharged from the first oil cylinder 5 received is re-flowed back to the first oil cylinder 5.

[0032] As Figure 1As shown in the figure, the engine voltage control automatic idle speed system designed in the embodiment of the present invention includes a hydraulic system, a throttle control system, an oil storage cylinder 8, a first pressure switch 11, a second pressure switch 12, a three-position four-way solenoid valve 9, and a storage battery 16. The throttle control system at least includes a first cylinder 5 and an engine throttle. Among them, the hydraulic system includes but is not limited to a motor, a cylinder, a main valve, an operating handle, a fuel tank, a radiator, a pump, an accumulator, and a safety locking solenoid valve 17, etc. 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. Since components such as the fuel tank and accumulator in the hydraulic system are always in an oil-filled state, it can supply oil to the oil storage cylinder 8 and the first cylinder 5 in the throttle control system to achieve quantitative control of the oil inlet and outlet in the cylinder cavity and realize the automatic idle speed function of the engineering vehicle engine; the throttle control system at least includes a throttle device 1, a throttle cable 2, a bracket 3, a slide rail 4, a first cylinder 5, and a connecting rod 6. Among them, the throttle device 1 is fixed on the control box of the engineering vehicle to facilitate the adjustment of the throttle size. The throttle cable 2 is used to connect the first cylinder 5 and the throttle device 1, and its two ends are respectively fixed on the control box and the engine using fixed brackets 3. The slide rail 4 is fixed on the engine. The first cylinder 5 can slide on the slide rail 4 following the pulling of the throttle cable 2. The piston end of the first cylinder 5 is connected to the connecting rod 6 through a pin shaft, and the other end of the connecting rod 6 is connected to the engine throttle pin shaft. The connecting rod 6 has a certain degree of rotational freedom and can adapt to the rotation of the throttle. The specific principle of throttle control is as follows: Push the throttle device 1, and the throttle cable 2 is stressed to drive the first cylinder 5 to move freely on the slide rail 4 following the stress, and drive the connecting rod 6 to push and pull the engine throttle to adjust the speed.

[0033] In the embodiment of the present 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 switch states of the first pressure switch 11 and the second pressure switch 12 respectively based on the detected working state of the engineering vehicle. Among them, 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 in a non-working state, it can control the first pressure switch 11 to close and the second pressure switch 12 to open, or when detecting that the engineering vehicle is in a working state, it can control the first pressure switch to open and the second pressure switch 12 to close; such as Figure 2As shown, the three-position four-way solenoid valve 9 includes three spool working positions (including the first side (such as the right side), the second side (such as the left side), and the neutral position) and four ports (including the first pressure oil port (D), the second oil return port (F), the third working oil port (C), and the fourth working oil port (E)). The first pressure switch 11 is used to control the conduction states of the first pressure oil port and the third working oil port, and the conduction states of the second oil return port and the fourth working oil port. That is, when the first pressure switch 11 is closed, the first pressure oil port and the third working oil port are conducted, and the second oil return port and the fourth working oil port are conducted; the second pressure switch 12 is used to control the conduction states of the first pressure oil port and the fourth working oil port, and the conduction states of the second oil return port and the third working oil port. That is, when the second pressure switch 12 is closed, the first pressure oil port and the fourth working oil port are conducted, and the second oil return port and the third working oil port are conducted.

[0034] In the embodiment of the present invention, when the first pressure switch 11 is closed and the second pressure switch 12 is opened (the engineering vehicle is in a non-working state), the hydraulic system can supply oil to the rodless cavity side of the first oil cylinder 5 through the first pressure oil port and the third working oil port (i.e., D→C), so that the piston in the first oil cylinder 5 will drive the connecting rod 6 to push and pull the engine throttle to move towards the idle position due to the oil supply until the engine throttle reaches the idle position, realizing the automatic idle function of the engine. At this time, the rod cavity side cavity in the first oil cylinder 5 discharges oil outward due to the piston movement. It can be designed that the closed cavities of the first oil cylinder 5 and the oil storage cylinder 8 are filled with oil by means of a plug or the like. That is, the oil in the first oil cylinder 5 is discharged through the A port and enters the rod cavity side of the oil storage cylinder 8 through the B port. Among them, the oil on the rodless cavity side of the oil storage cylinder 8 will return to the fuel tank through the fourth working oil port and the second oil return port (i.e., E→F); when the second pressure switch 12 is closed and the first pressure switch 11 is opened (the engineering vehicle is in a working state), the hydraulic system can supply oil to the rodless cavity side of the oil storage cylinder 8 through the first pressure oil port and the fourth working oil port (i.e., D→E). The piston in the oil storage cylinder 8 moves, and the oil discharged from the first oil cylinder 5 received in the rod cavity side is refluxed back to the rod cavity side of the first oil cylinder 5 through the B port and the A port, and then the piston in the first oil cylinder 5 moves to the original position based on the refluxed oil, so that the throttle returns to the original working position. Among them, the oil on the rodless cavity side of the first oil cylinder 5 will return to the fuel tank through the third working oil port and the second oil return port (i.e., C→F).

[0035] The electro-hydraulic control automatic idle speed system provided by the present invention, the designed system includes a hydraulic system, a throttle control system, an oil storage cylinder, a first pressure switch, a second pressure switch, a three-position four-way solenoid valve and a storage battery. The throttle control system at least includes a first oil cylinder and an engine throttle. Among them, the first pressure switch and the second pressure switch are connected to the pipeline of the hydraulic system, so that the hydraulic system controls the switch states 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 solenoid valve is connected to the hydraulic system, the second oil return port is communicated with the oil tank in the hydraulic system, and is used to guide the oil back to the oil tank. The third working oil port is connected to the first oil cylinder, and the fourth working oil port is connected to the oil storage cylinder. The first pressure switch is used to control the conduction states of the first pressure oil port and the third working oil port, and the second oil return port and the fourth working oil port. The second pressure switch is used to control the conduction states of the first pressure oil port and the fourth working oil port, and the second oil return 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 move to the idle speed position, and discharges the oil through the cavity into the oil storage cylinder. 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 received is reflowed back to the first oil cylinder, realizing the quantitative control of the oil inlet and outlet in the oil cylinder cavity in an electro-hydraulic combined manner, ensuring the consistency of the piston's reciprocating position even when the piston in the oil cylinder is in different positions, thereby realizing the automatic idle speed function of the engineering vehicle engine, with reduced cost, simple layout, and no need to change the mechanical cable.

[0036] In an optional embodiment, the system further includes a first relay and a second relay. Among them, the first end of the first relay is connected to the storage battery, the second end is connected to the first pressure switch, and the first output contact is connected to the first side electromagnetic coil of the three-position four-way solenoid valve, forming a first current loop, which is used to control the conduction of the first pressure oil port and the third working oil port, and the second oil return port and the fourth working oil port when the first current loop is conducted; the first end of the second relay is connected to the storage battery, the second end is connected to the second pressure switch, and the third output contact is connected to the second side electromagnetic coil of the three-position four-way solenoid valve, forming a second current loop, which is used to control the conduction of the first pressure oil port and the fourth working oil port, and the second oil return port and the third working oil port when the second current loop is conducted.

[0037] In the embodiment of the present invention, the first end of the first relay 10 is connected to the storage battery 16, the second end is connected to the first pressure switch 11, and the first output contact is connected to the first side electromagnetic coil of the three-position four-way solenoid valve 9, forming a first current loop. Among them, a 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, a magnetic field will be generated in the coil, so that the magnetized iron core generates an electromagnetic force to attract the armature to move, and then drive the contacts connected thereto to change states, so that the electromagnetic coil on the corresponding side of the three-position four-way solenoid valve connected thereto is energized. When the first pressure switch 11 is closed and the first current loop is conducted, the first side electromagnetic coil of the three-position four-way solenoid valve 9 is energized, and the spool moves to the first side under the action of the electromagnetic force. At this time, the first pressure oil port and the third working oil port, the second oil return port and the fourth working oil port are all conducted; the first end of the second relay 13 is connected to the storage battery 16, the second end is connected to the second pressure switch 12, and the second output contact is connected to the second side electromagnetic coil of the three-position four-way solenoid valve 9, forming a second current loop. When the second current loop is conducted, the second side electromagnetic coil corresponding to the second side electromagnetic coil is energized, and the spool moves to the second side under the action of the electromagnetic force, and the first pressure oil port and the fourth working oil port, the third working oil port and the second oil return port are all conducted.

[0038] In some alternative embodiments, the system further includes a first travel switch 7 and a second travel switch 18. Among them, the first travel switch 7 is fixed at the engine throttle idle position and is in control connection with the first side electromagnetic coil of the three-position four-way solenoid valve 9, and is used to control the on or off state of the first current loop based on the movement of the piston in the first oil cylinder 5; the second travel switch 18 is connected to the piston in the oil storage cylinder 8 and is in control connection with the second side electromagnetic coil of the three-position four-way solenoid valve 9, and is used to control the on or off state of the second current loop based on the movement of the piston in the oil storage cylinder 8.

[0039] Such as Figure 1As shown, the first travel switch 7 is fixed at the engine throttle idle position so that when monitoring the position of the engine throttle in the idle state, the triggering mechanism can execute corresponding control actions. The first travel switch 7 is in control connection with the first-side electromagnetic coil of the three-position four-way solenoid valve 9 to control the on or off state of the first current circuit. For example, the first travel switch 7 is initially in the closed state. When responding to the position of the engine throttle in the idle state, the first travel switch 7 disconnects, causing the first current circuit to disconnect, and the spool of the three-position four-way solenoid valve 9 returns to the middle position. The second travel 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 serving as a triggering mechanism to execute corresponding control actions (such as disconnecting and closing), and then controlling the on or off state of the second current circuit. For example, the second travel switch 18 is initially in the open state. When the oil in the first oil cylinder 5 enters the oil storage cylinder 8, the piston in the oil storage cylinder 8 moves toward the rodless cavity side, away from the second travel switch 18, triggering the second travel switch 18 to close, so that when the second pressure switch 12 is in the closed state subsequently, the second current circuit is turned on.

[0040] The first travel switch and the second travel switch designed in the present invention can respectively automatically control the on and off of the corresponding current circuits according to the movement of the pistons in the corresponding oil cylinders, improving the automation degree of the system and achieving precise adjustment of the state of the three-position four-way solenoid valve.

[0041] Specifically, the hydraulic system feeds oil into the rodless cavity side of the first oil cylinder 5 through the first pressure oil port and the third working oil port to control the piston in the first oil cylinder 5 to push the engine throttle toward the idle position. When reaching the idle position, the first travel switch 7 disconnects, controlling the first current circuit to disconnect; the second travel switch 18 is in contact induction connection with the piston in the oil storage cylinder 8. The oil on the rod side of the first oil cylinder 5 is discharged and enters the rod side of the oil storage cylinder 8 to control the movement of the piston in the oil storage cylinder 8, triggering the second travel switch 7 to close. Among them, the oil on the rodless cavity side of the oil storage cylinder 8 returns to the fuel tank through the fourth working oil port and the second oil return port; the hydraulic system feeds oil into the rodless cavity side of the oil storage cylinder 8 through the first pressure oil port and the fourth working oil port to control the movement of the piston in the oil storage cylinder 8 until triggering the second travel switch 18 to disconnect, and the second current circuit disconnects. The oil received from the first oil cylinder 5 in the rod side of the oil storage cylinder 8 flows back to the rod side of the first oil cylinder 5 again. Among them, the oil on the rodless cavity side of the first oil cylinder 5 returns to the fuel tank through the third working oil port and the second oil return port.

[0042] In the embodiment of the present invention, the first travel switch 7 is initially in a closed state. When it is detected that the engineering vehicle is in a non-operating 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 feeds oil into the rodless cavity side of the first oil cylinder 5 through the first pressure oil port and the third working oil port. The piston in the first oil cylinder 5 extends to push the engine throttle towards the idle position. When the engine throttle reaches the idle position, the first travel switch 7 is triggered to disconnect, the first current circuit is powered off, and the spool of the three-position four-way solenoid valve 9 returns to the middle position. At this time, the engine throttle stays at the idle position. During the above process, the oil on the rod side of the first oil cylinder 5 is discharged and all enters the rod side of the oil storage cylinder 8. The piston in the oil storage cylinder 8 moves towards the rodless cavity side. Among them, because the piston moves towards the rodless cavity side, the oil corresponding to the rodless cavity side can return to the fuel tank through the fourth working oil port and the second oil return port. The piston leaves the second travel switch 18, triggering the second travel switch 18 to close (the second travel switch 18 is initially in an open state), which facilitates the subsequent conduction of the second current circuit when the second pressure switch 12 is in a closed state; when the staff operates the engineering vehicle to work, it is detected that the engineering vehicle is in a working state. At this time, the second pressure switch 12 is controlled to be in a closed state, the second current circuit is turned on, the three-position four-way solenoid valve 9 is opened to enter the second side position, the first pressure oil port and the fourth working oil port are conducted, and the second oil return port and the third working oil port are conducted. The hydraulic system feeds oil into the rodless cavity side of the oil storage cylinder 8 through the first pressure oil port and the fourth working oil port, pushing the piston to move and extend towards the rod side until it contacts the second travel switch 18, triggering the second travel switch 18 to disconnect, the second current circuit is powered off, and the spool of the three-position four-way solenoid valve 9 returns to the middle position. At this time, the oil discharged from the first oil cylinder 5 received in the rod side of the oil storage cylinder 8 returns to the rod side of the oil storage cylinder 8 again, and the throttle returns to the original working position. Among them, the oil on the rodless cavity side of the first oil cylinder 5 can return to the fuel tank in the hydraulic system through the third working oil port and the second oil return port.

[0043] In the present invention, the oil on the rod side of the first oil cylinder is discharged into the rod side of the oil storage cylinder, establishing an association between the piston movements of the two, ensuring the consistency of the reciprocating positions of the piston even when the oil cylinder pistons are in different positions. The travel switch can accurately sense the position and travel state of the piston, thereby achieving precise control and timely stop of the oil cylinder movement.

[0044] In some alternative embodiments, the system further includes a rocker switch 15 and a fuse device 14. Among them, 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, which is used to control the current flow state of the battery 16; the current output by the battery 16 flows into the first relay 10 and the second relay 13 through the fuse device 14.

[0045] The engine electro-hydraulic control automatic idle system designed in the embodiments of the present invention further includes a rocker switch 15 and a fuse device 14. As Figure 1 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 after the operator presses the rocker switch 15, indicating that the engine automatic idle function is turned on, can the current of the battery 16 flow to the first relay 10 and the second relay 13. If the automatic idle function is not turned on, both the first current loop and the second current loop are in an open state. Among them, the rocker switch 15 can be placed on the control box to facilitate the engineering vehicle operator to select the idle function, enabling the operator to flexibly decide whether to turn on the idle function according to actual needs, enhancing the controllability of the engineering vehicle operation, and making the vehicle operation more in line with the 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 by the battery 16 flows into the first relay 10 and the second relay 13 through the rocker switch 15 and the fuse device 14, which can prevent problems such as circuit overload damage and extend the service life of the system.

[0046] Specifically, the first relay 10 is a time-delay relay. The first relay 10 designed in the embodiments of the present invention is a time-delay relay, which can prevent the vehicle from immediately entering the idle state after detecting that the vehicle is in a non-working state, 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 at least includes a load-sensing pipeline and a safety locking solenoid valve 17. Among them, the load-sensing pipeline is connected to the first pressure switch 11 and the second pressure switch 12, and is used to control the switch states of the first pressure switch 11 and the second pressure switch 12 based on the detected pressure signal of the engineering vehicle hydraulic system; the hydraulic system feeds oil to the oil storage cylinder 8 and the first oil cylinder 5 through the safety locking solenoid valve 17.

[0048] The hydraulic system designed in the embodiments of the present invention at least includes a load-sensing line and a safety locking solenoid valve 17. As Figure 1 shown, the load-sensing pipeline is a load-sensing LS pipeline, which is connected to the first pressure switch 11 and the second pressure switch 12 to control the switch states of the first pressure switch 11 and the second pressure switch 12 based on the detected pressure signal of the engineering vehicle hydraulic system. For example, when there is no pressure in the load-sensing 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-sensing 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 equipment in the hydraulic system feeds 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, an embodiment of a thermal management method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. And although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than here.

[0050] In this embodiment, an engine electro-hydraulic control automatic idle method is provided, which can be used for the engine electro-hydraulic control automatic idle system described in the above embodiment. Figure 3 It is a flowchart of the engine electro-hydraulic control automatic idle method according to an embodiment of the present invention, as Figure 3 shown, this process includes the following steps:

[0051] Step S301, obtain the current working state of the engineering vehicle.

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

[0053] In the embodiment of the present invention, the current working state of the engineering vehicle, that is, whether it is in a working state, can be obtained by means of an on-vehicle monitoring system or sensor detection, etc. Then, based on the working state of the engineering vehicle, the switch states of the first pressure switch and the second pressure switch are respectively controlled, and then the conduction of the first current loop or the second current loop is controlled. For example, if it is determined that the engineering vehicle is currently in a non-working state, the first pressure switch can be controlled to close and the second pressure switch to open to achieve the conduction of the first current loop. The hydraulic system supplies oil to the first oil cylinder through the first pressure oil port and the third working oil port, and controls the piston in the first oil 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 controlled to open and the second pressure switch to close to achieve the conduction of the second current loop. The hydraulic system supplies oil to the oil storage cylinder through the first pressure oil port and the fourth working oil port, and controls the oil discharged from the first oil cylinder received in the oil storage cylinder to return to the first oil cylinder again, so that the engine throttle returns to the original working position.

[0054] The engine electro-hydraulic control automatic idle method provided by the present invention realizes the automatic idle function of the engine by obtaining the current working state of the engineering vehicle and controlling the switch states of the first pressure switch and the second pressure switch based on the current working state of the engineering vehicle.

[0055] Specifically, based on the pressure in the load-sensing line of the hydraulic system, the current working state of the engineering vehicle is determined. 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, while the second pressure switch is 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, while the second pressure switch is in the closed state.

[0056] In the embodiment of the present invention, when no pressure is detected in the load-sensing pipeline of the hydraulic system, indicating that the current working state of the engineering vehicle is the non-working state, the first pressure switch is controlled to be in the closed state, and the second pressure switch is in the open state. The battery current passes through the fuse device, the first relay to the first pressure switch, and the first current loop is conducted. After the first relay delays for several seconds (which can be selected according to requirements, generally 4 - 6 s), it is attracted, and the three-position four-way solenoid valve opens and enters the first side position. 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. The piston in the first oil cylinder extends to push the engine throttle towards the idle position until the engine throttle reaches the idle position, at which time the first travel switch is disconnected, the first current loop is powered off, and the three-position four-way solenoid valve returns to the middle position. At this time, the throttle stays at the idle position. During the above process, all the oil discharged from the rod side of the first oil cylinder enters the rod side of the oil storage oil cylinder, and the piston in the oil storage oil cylinder moves towards the rodless cavity side and leaves the second travel switch, and the second travel switch switches to the closed state. Among them, the oil on the rodless cavity side of the oil storage oil cylinder can return to the fuel tank in the hydraulic system through the fourth working oil port and the second oil return port.

[0057] When pressure is detected in the load-sensing pipeline of the hydraulic system, indicating that the current working state of the engineering vehicle is the working state, the first pressure switch is controlled to be in the open state, and the second pressure switch is in the closed state. The battery current passes through the fuse device, the second relay to the second pressure switch, and the second current loop is conducted. The second relay is attracted, and the three-position four-way solenoid valve opens and enters the second side position. The hydraulic system supplies oil to the rodless cavity side of the oil storage oil cylinder through the first pressure oil port and the fourth working oil port, pushing the piston towards the rod side until it contacts the second travel switch, triggering the second travel switch to switch to the open state, the second current loop is powered off, and the three-position four-way solenoid valve returns to the middle position. At this time, the oil entering the rod side of the oil storage oil cylinder returns to the rod side of the first oil cylinder again, causing the engine throttle to return to the original working position. Among them, the oil on the rodless cavity side of the first oil cylinder can return to the fuel tank in the hydraulic system through the third working oil port and the second oil return port.

[0058] In this embodiment, an engineering vehicle is also provided, as Figure 4As shown, the construction vehicle includes an engine electro-hydraulic control automatic idle system and a controller. The controller includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the engine electro-hydraulic control automatic idle method described in the above embodiments.

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

[0060] Please refer to Figure 5 , Figure 5 which is a schematic structural diagram of a computer device provided by an optional embodiment of the present invention. As shown in Figure 5 , the computer device includes one or more processors 110, a memory 120, and an interface for connecting each component, including a high-speed interface and a low-speed interface. Each component is communicatively connected to each other using different buses and can be installed on a common motherboard or installed in other ways as needed. The processor can process instructions executed within the computer device, including instructions stored in the memory or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a set of blade servers, or a multi-processor system). Figure 5 In

[0061] Processor 110 can be a central processing unit, a network processor, or a combination thereof. Among them, processor 110 can further include a hardware chip. The above hardware chip can be an application-specific integrated circuit, a programmable logic device, or a combination thereof. The above programmable logic device can be a complex programmable logic device, a field programmable gate array, a general array logic, or any combination thereof.

[0062] Among them, the memory 120 stores instructions executable by at least one processor 110, so that at least one processor 110 executes the method shown in the above embodiments.

[0063] The memory 120 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 120 may include high-speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid-state storage devices. In some alternative embodiments, the memory 120 may optionally include a memory remotely provided with respect to the processor 110, and these remote memories may be connected to the computer device through a network. Examples of the above-mentioned network include but are not limited to the Internet, intranet, local area network, mobile communication network, 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 further include a combination of the above types of memory.

[0065] The computer device further includes a communication interface 130 for the computer device to communicate with other devices or communication networks.

[0066] Embodiments of the present invention further provide a computer-readable storage medium. The methods according to the embodiments of the present invention can be implemented in hardware, firmware, or be implemented as computer code that can be recorded on a storage medium, or be implemented by downloading through a network and originally stored in a remote storage medium or a non-transitory machine-readable storage medium and will be stored in a local storage medium, so that the methods described herein can be stored in such software processes on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium may 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 may also include a combination of the above types of memory. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code, and when the software or computer code is accessed and executed by the computer, the processor, or the hardware, the methods shown in the above embodiments are implemented.

[0067] A part of the present 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 present invention through the operations of the computer. Those skilled in the art should understand that the forms of existence of computer program instructions in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways for computer program instructions to be executed by a computer include, but are not limited to: the computer directly executes the instructions, or the computer compiles the instructions and then executes the corresponding compiled program, or the computer reads and executes the instructions, or the computer reads and installs the instructions and then executes the corresponding installed program. Herein, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to the computer.

[0068] Although the embodiments of the present 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 present invention, and such modifications and variations all fall within the defined scope.

Claims

1. An engine electro-hydraulic controlled automatic idle system, characterized in that: The system includes a hydraulic system, a throttle control system, an oil storage cylinder, a first pressure switch, a second pressure switch, a three-position four-way solenoid valve and a battery. The battery provides current for the system. The throttle control system includes at least a first oil cylinder and an engine throttle, wherein: The first pressure switch and the second pressure switch are connected to the pipeline of the hydraulic system so that the hydraulic system controls the switch states 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 solenoid valve is connected to the hydraulic system, the second return oil port is connected to the oil tank in the hydraulic system for guiding the oil back to the oil tank, the third working oil port is connected to the first oil cylinder, and the fourth working oil port is connected to the oil storage cylinder; The first pressure switch is used to control the conduction state between the first pressure oil port and the third working oil port, and the conduction state between the second oil return port and the fourth working oil port; The second pressure switch is used to control the conduction state between the first pressure oil port and the fourth working oil port, and the conduction state between the second oil return 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 to move the piston in the oil storage cylinder and return the received oil discharged from the first oil cylinder to the first oil cylinder.

2. The system according to claim 1, characterized in that The system further comprises a first relay and a second relay, wherein, The first end of the first relay is connected to the battery, the second end is connected to the first pressure switch, and the first output contact is connected to the first side electromagnetic coil of the three-position four-way electromagnetic valve, forming a first current loop, which is used to control the first pressure oil port and the third working oil port to be connected, and the second return oil port and the fourth working oil port to be connected when the first current loop is turned on; The first end of the second relay is connected to the battery, the second end is connected to the second pressure switch, and the third output contact is connected to the second side electromagnetic coil of the three-position four-way solenoid valve, forming a second current loop, which is used to control the first pressure oil port and the fourth working oil port to be connected, and the second return oil port and the third working oil port to be connected when the second current loop is turned on.

3. The system according to claim 2, characterized in that 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 establishes a control connection with the first side electromagnetic coil of the three-position four-way electromagnetic valve, and is used to control the on or off state of the first current circuit based on the movement of the piston in the first oil cylinder; The second travel switch is connected to the piston in the oil storage cylinder and is controlled to the second side electromagnetic coil of the three-position four-way solenoid valve, so as to control the on or off state of the second current circuit based on the movement of the piston in the oil storage cylinder.

4. The system according to claim 3, characterized in that The hydraulic system supplies oil to the rodless chamber 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 toward the idle position, and when the idle position is reached, the first travel switch is disconnected to control the first current circuit to be disconnected; The second stroke switch establishes a contact induction connection with the piston in the oil storage cylinder, and the oil on the rod cavity side of the first cylinder is discharged and enters the rod cavity side of the oil storage cylinder to control the movement of the piston of the oil storage cylinder, triggering the closing of the second stroke switch, wherein the oil on the rodless cavity side of the oil storage cylinder returns to the oil tank through the fourth working oil port and the second oil return port; The hydraulic system supplies oil to the rodless chamber side of the oil storage cylinder through the first pressure oil port and the fourth working oil port to control the movement of the piston in the oil storage cylinder until the second stroke switch is triggered to disconnect, the second current circuit is disconnected, and the oil discharged from the first oil cylinder received in the rod chamber side of the oil storage cylinder flows back to the rod chamber side of the first oil cylinder, wherein the oil on the rodless chamber side of the first oil cylinder returns to the oil tank through the third working oil port and the second return oil port.

5. The system according to claim 1, characterized in that The system also includes a rocker switch and a safety device, wherein: The first end of the rocker switch is connected to the battery, and the second end is connected to the safety device, so as to control the flow state of the battery current; The current output by the battery flows into the first relay and the second relay through the fuse.

6. The system according to claim 2, characterized in that The first relay is a time delay relay.

7. The system according to claim 1, characterized in that The hydraulic system comprises at least a load sensing pipeline and a safety locking solenoid valve, wherein: The load sensing pipeline is connected to the first pressure switch and the second pressure switch, and is used to control the switch states 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 cylinder through the safety locking solenoid valve.

8. An engine electro-hydraulic control automatic idling method, characterized in that: Applicable to the engine electro-hydraulic control automatic idle system according to any one of claims 1 to 7, the method comprising: Get the current working status of the engineering vehicle; Based on the current working state of the engineering vehicle, the switch states of the first pressure switch and the second pressure switch are controlled.

9. The method according to claim 8, characterized in that Determining the current working state of the engineering vehicle based on the pressure in the load sensing line in the hydraulic system, and controlling the switch states of the first pressure switch and the second pressure switch based on the current working state of the engineering vehicle, comprises: If it is detected that there is no pressure in the load-sensitive pipeline in the hydraulic system, it means that the current working state of the engineering vehicle is not working, and the first pressure switch is controlled to be in a closed state and the second pressure switch is in an open state; If pressure is detected in the load-sensitive pipeline in the hydraulic system, it means that the current working state of the engineering vehicle is the working state, and the first pressure switch is controlled to be in the disconnected state and the second pressure switch is in the closed state.

10. An engineering vehicle, characterized in that: The engineering vehicle includes an engine electro-hydraulic controlled automatic idle system and a controller, and the controller includes: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the engine electro-hydraulic control automatic idling method according to any one of claims 7 to 8 by executing the computer instructions. The engineering vehicle according to claim 10 , wherein the engineering vehicle is an excavator.

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