Electro-hydraulic clutch mechanism and engine control system

Abstract

An electro-hydraulic controlled clutch mechanism and an engine control system, wherein the electro-hydraulic controlled clutch mechanism is provided with an electro-hydraulic control system, and the action control of the clutch mechanism is realized by the electro-hydraulic control system, and the electro-hydraulic control system includes an electronic control system and a hydraulic drive system; the electronic control system includes a key door, and a preheating gear connection line is connected to the preheating gear of the key door, and the preheating gear connection line is used to realize automatic oil unloading of the clutch cylinder on the hydraulic drive system. In the present invention, the hydraulic drive system can automatically detect, automatically unload and cut off the power of the engine and the cutting table transmission and the threshing transmission before the engine starts, and has the function of preventing the engine from starting with load and protecting the engine. A one-way throttle valve is provided, which can realize slow engagement and rapid separation of the clutch action process. The travel switch can automatically cut off the action of the cylinder, so that the transmission belt reaches the set tension, and the adjustment of the belt tension is easy to achieve.

Description

Technical Field

[0001] The present invention relates to the technical field of agricultural machinery and equipment, and more specifically, to an electro-hydraulic controlled clutch mechanism and an engine control system. Background Art

[0002] A grain combine harvester is a grain harvesting machine that can complete the processes of harvesting, threshing, separating stems, and removing debris from grain crops at one time and obtain grains directly from the field.

[0003] As a high-power agricultural machinery, the grain combine harvester has a complex and diverse transmission system, such as the harvesting table transmission, threshing transmission, grain unloading transmission, etc. However, the above transmission system does not need to transmit power all the time. For example, the harvesting table will only be operated when harvesting, and it will stop when not harvesting; the grain unloading transmission will only be operated when unloading grain, and it will stop at other times; the threshing (threshing) device will only operate when harvesting, and it will stop at other times. Therefore, harvesters are often equipped with multiple and multiple clutch devices to meet the work requirements of power cutting and combining for different execution actions.

[0004] In addition, according to the harvester driver's operating specifications: the operator is required to operate all transmission clutches to the power transmission cut-off state before parking (before the engine is turned off) to ensure that the engine is in a no-load state when it is started next time.

[0005] Please refer to Figure 1 , Figure 1 The present invention is a schematic diagram of a typical transmission clutch mechanism used in a grain combine harvester in the prior art.

[0006] At present, the structure of the clutch mechanism of the transmission device for grain combine harvesters, which is widely used and has a typical structure, is as follows, including an operating lever a, a tooth plate b and a connecting rod mechanism c. An operating button is provided on the operating lever a, and a claw block is also provided on the operating lever a. The claw block is linked to the operating button, and a positioning groove cooperating with the claw block is provided on the tooth plate b. After pressing the operating button, the claw block is disengaged from the positioning groove on the tooth plate b, so that the operating lever a can be lifted up or pressed down. The operating lever a is connected to the connecting rod mechanism c and can drive the tensioning wheel (a component of the clutch mechanism) through the connecting rod mechanism c to tighten the belt or disengage it from the belt.

[0007] Combination Figure 1 The working principle of the transmission clutch mechanism for the grain combine harvester is as follows:

[0008] Operation of threshing clutch: press the operating button and lift the operating lever to make the claw block fit into the upper positioning groove of the tooth plate, then the threshing part starts to work; when separating, press the operating button and turn the operating lever down to the separation position to stop working. When starting the engine, if the operating lever is in the engagement position, the engine will not be started, so it must be in the separation position to start the engine.

[0009] Cutting table clutch operation: press the operation button and lift the operating lever to make the claw block fit into the upper positioning groove of the tooth plate, then the cutting table starts to work; to separate, press the operation button and turn the operating lever down to the separation position, then the cutting table stops working.

[0010] After the threshing and unloading clutch has been working for a period of time, the length of the belt will increase due to aging, and the belt elongation cannot meet the tension requirement. This requires structural adjustment of the clutch mechanism of the transmission device of the grain combine harvester, and the adjustment operation is complicated and cumbersome.

[0011] In summary, the existing transmission clutch mechanism for grain combine harvesters has problems such as laborious operation, complex structure, limited space arrangement, and difficulty in structural adjustment.

[0012] Therefore, how to optimize the structure of the clutch mechanism of the transmission device for the grain combine harvester so as to solve the problem of the laborious operation process has become an urgent problem to be solved by those skilled in the art. Summary of the invention

[0013] The purpose of the present invention is to provide an easy-to-use clutch mechanism for a harvester, which controls the tensioning wheel through a hydraulic drive system to achieve power transmission and cutoff. The hydraulic drive system has a small system structure volume, which is convenient for system installation and structural adjustment.

[0014] The technical solution provided by the present invention is as follows:

[0015] The present invention provides an electro-hydraulic controlled clutch mechanism, including a tensioning wheel. In order to realize the electro-hydraulic control of the tensioning wheel, the present invention also includes:

[0016] A clutch oil cylinder having a rodless chamber and a rod chamber, wherein the rodless chamber and the rod chamber are externally connected with an oil inlet pipeline, and the oil inlet pipeline is connected with a hydraulic oil tank to form a circuit;

[0017] A solenoid valve, in different working states, the valve core of the solenoid valve is switched to different positions to control the pressure oil of the hydraulic oil tank to flow into the oil inlet pipeline;

[0018] A hydraulic switch is arranged on the oil inlet pipeline of the clutch oil cylinder; when the solenoid valve is in an open state, the hydraulic oil flows to the rodless chamber or the rod chamber through the hydraulic switch;

[0019] When the hydraulic oil flows to the rodless chamber, the rod chamber returns oil to the hydraulic oil tank; the piston rod of the clutch cylinder extends, causing the tension wheel to press against the belt between the engine and the actuator;

[0020] When the hydraulic oil flows to the rod chamber, the rodless chamber returns oil to the hydraulic oil tank; the piston rod of the clutch cylinder retracts, so that the tension wheel leaves the belt between the engine and the actuator.

[0021] Preferably, the oil inlet pipeline includes: a rodless oil inlet branch arranged between the rodless chamber and the hydraulic oil tank; and a rod oil inlet branch arranged between the rod chamber and the hydraulic oil tank.

[0022] Preferably, a one-way throttle valve is arranged on the rodless oil inlet branch; when the hydraulic oil flows to the rodless chamber, the throttle hole of the one-way throttle valve is in an effective state, so that the piston rod of the clutch cylinder slowly extends; when the hydraulic oil flows to the rod chamber, the throttle hole of the one-way throttle valve is in an invalid state, and the piston rod of the clutch cylinder quickly retracts.

[0023] Preferably, the hydraulic switch includes: a hydraulic lock having two one-way valves, one one-way valve being arranged on the rodless oil inlet branch, and the other one-way valve being arranged on the rod oil inlet branch; when the solenoid valve is in an open state, the hydraulic oil pushes the one-way valve to be in an open state.

[0024] Preferably, the present invention further comprises: a travel switch for detecting the position of the piston rod, when the piston rod touches the travel switch, the solenoid valve is powered off, the valve core of the solenoid valve is reset, and the pressure oil is cut off from flowing to the clutch cylinder.

[0025] Based on the above electro-hydraulic controlled clutch mechanism, the present invention further provides an engine control system, which is equipped with the above electro-hydraulic controlled clutch mechanism. In addition, the engine control system provided by the present invention also includes:

[0026] The power supply unit, the switch control unit, the engine, the solenoid valve, and the key door are connected to form a circuit;

[0027] The switch control unit controls the power supply of the power supply unit;

[0028] When the power supply unit supplies power, the key door controls the engine to be in a preheating state, changes the valve core position of the solenoid valve, connects the rodless chamber of the clutch cylinder with the hydraulic oil tank, and retracts the piston rod of the clutch cylinder, causing the tensioning wheel to leave the belt between the engine and the actuator.

[0029] Preferably, the key door includes: a start gear terminal, which is connected to the power supply unit through the coil of the start relay in the switch control unit; one end of the contact of the start relay is connected to the starter in the switch control unit, and the starter is connected to the power supply unit; the other end of the contact of the start relay is connected to the power supply unit.

[0030] Preferably, the key door comprises: a preheating terminal, the preheating terminal is connected to the solenoid valve, and the solenoid valve is also connected to the power supply unit.

[0031] Preferably, the key door comprises: an ignition gear terminal, the ignition gear terminal is connected to a relay of the switch control unit, the ignition gear terminal is also connected to an ignition switch of the control unit, and the relay is connected to the power supply unit.

[0032] Preferably, the key door further comprises: a locking gear wiring terminal, and the locking gear wiring terminal is connected to the power supply unit via a fuse or a fusible link.

[0033] Through the above structural design, the innovation of the present invention is:

[0034] 1. A hydraulic drive system is provided, through which the tensioning wheel is controlled to achieve power transmission and cutoff. The hydraulic drive system has a small system structure, which is convenient for system installation and structural adjustment. The control of the hydraulic drive system can be achieved through a button switch device with a relatively simple structure, which can achieve the purpose of simplifying the operation of the clutch mechanism and can also reduce the space occupied by the control equipment installed in the cab. In addition, the present invention adopts a button switch operation, which is comfortable and convenient to operate, simple in structure, and easy to operate the system position layout.

[0035] 2. A preheating gear connection line capable of controlling the solenoid valve is provided, through which the signal before the engine is started can be obtained, so that the clutch cylinder can be unloaded through the solenoid valve before the engine is started. The present invention optimizes the structure of the hydraulic drive system, has the function of automatic unloading of the header and threshing clutch, obtains the signal before the engine is started through the preheating gear connection line, automatically detects, automatically unloads and cuts off the power between the engine and the header transmission and threshing transmission before the engine is started, so that the present invention has the function of preventing the engine from starting with load and protecting the engine.

[0036] 3. A hydraulic lock is provided on the hydraulic drive system, so that the present invention can have an electrical interlocking function, thereby improving the stability of the tensioning wheel state maintenance, thereby achieving the purpose of improving the operational reliability of the present invention.

[0037] 4. The present invention uses the extension and retraction of the piston rod to realize the clutch mechanism, and the action sequence control logic can be realized through the structural design of the key door, which is convenient for the installation of the preheating gear connecting line.

[0038] 5. The present invention sets a one-way throttle valve on the hydraulic drive system, and the one-way throttle valve can realize one-way throttling of the connecting oil pipe, and realize slow oil supply when supplying oil to the rodless chamber of the clutch oil cylinder, and realize fast oil unloading when unloading oil from the rodless chamber of the clutch oil cylinder. Since the one-way throttle valve is set, the slow combination and fast separation of the clutch action process can be realized. The slow combination of the clutch action can avoid the sudden increase of the engine load to achieve the purpose of protecting the engine and the transmission belt. The fast separation of the clutch action can quickly cut off the power transmission from the engine to the cutting platform and threshing, and meet the operation requirements in emergency situations.

[0039] 6. The present invention is designed with a clutch stroke end position stroke limit switch, i.e., a stroke switch, which can automatically cut off the cylinder action when the piston rod reaches the set stroke, so that the transmission belt reaches the set tension. In addition, the transmission belt tension can be adjusted by adjusting the setting position of the stroke switch, and the adjustment operation is simple and easy to implement. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The preferred implementation scheme will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present application.

[0041] Figure 1 The present invention is a schematic diagram of a typical transmission clutch mechanism used in a grain combine harvester in the prior art;

[0042] exist Figure 1 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0043] Joystick a, gear plate b, connecting rod mechanism c.

[0044] Figure 2 A control flow chart of an engine control system in an embodiment of the present invention;

[0045] Figure 3 The electrical schematic diagram of the engine control system in the embodiment of the present invention;

[0046] Figure 4 A schematic diagram of the hydraulic principle of an engine control system according to an embodiment of the present invention;

[0047] Figure 5 is a layout view of an ignition switch in an embodiment of the present invention;

[0048] Figure 6 It is a wiring diagram of a key door in an embodiment of the present invention;

[0049] exist Figure 3 and Figure 4 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0050] Preheating gear connection line 1, solenoid valve 2, clutch cylinder 3, hydraulic lock 4, one-way throttle valve 5,

[0051] Travel switch 6, starter 7, generator 8, power supply unit 9, key door 10, negative bus 11,

[0052] Starter relay 12, fusible link 13, first fuse 14, second fuse 15, power switch 16, ECU control unit 17, ignition switch 18, instrument panel 19, in-vehicle auxiliary system 20,

[0053] External vehicle assistance systems21. DETAILED DESCRIPTION

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0055] In order to simplify the drawings, each figure only schematically shows the parts related to the present invention, which do not represent the actual structure of the product.

[0056] Please refer to Figures 2 to 6 ,in, Figure 2 A control flow chart of an engine control system in an embodiment of the present invention; Figure 3 The electrical schematic diagram of the engine control system in the embodiment of the present invention; Figure 4 A schematic diagram of the hydraulic principle of an engine control system according to an embodiment of the present invention; Figure 5 is a layout view of an ignition switch in an embodiment of the present invention; Figure 6 1 is a wiring diagram of a key door in an embodiment of the present invention.

[0057] The invention discloses an electro-hydraulic controlled clutch mechanism, which comprises a tensioning wheel, and a belt for realizing power transmission is matched with the tensioning wheel, and the transmission and cutting of power are realized by pressing or loosening the belt by the tensioning wheel.

[0058] In the prior art, the tensioning wheel is controlled by a joystick in cooperation with a connecting rod mechanism, which makes the control operation of the clutch mechanism complicated and cumbersome. After the belt ages, the structural adjustment operation of the connecting rod mechanism is also difficult.

[0059] In order to facilitate the control of the tensioning wheel, the present invention provides an electro-hydraulic controlled clutch mechanism. Specifically, the electro-hydraulic controlled clutch mechanism includes a hydraulic drive system, which provides driving force for the movement of the tensioning wheel through the hydraulic drive system, thereby controlling the connection and separation of the tensioning wheel and the belt.

[0060] In the present invention, the hydraulic drive system includes a clutch cylinder 3 and a solenoid valve 2 connected to the clutch cylinder 3 for switching the working state of the clutch cylinder 3 .

[0061] The clutch oil cylinder 3 has a rodless chamber and a rod chamber, wherein the rodless chamber and the rod chamber are externally connected with an oil inlet pipeline, which is connected with the hydraulic oil tank through the oil inlet pipeline to form a circuit.

[0062] The clutch cylinder 3 has three working states, which are: 1. Oil is injected into the rodless chamber, oil is discharged from the rod chamber, and the piston rod is extended; 2. Oil is injected into the rod chamber, oil is discharged from the rodless chamber, and the piston rod is retracted; 3. The oil circuits of the rod chamber and the rodless chamber are closed, and the piston rod is in a stationary state.

[0063] The solenoid valve 2 is connected to the clutch cylinder 3 to form an oil circuit, and the solenoid valve 2 switches the flow direction of the hydraulic oil in the oil circuit to achieve the change of the working state of the clutch cylinder 3. In different working states, the valve core of the solenoid valve 2 is switched to different positions, which can control the pressure oil in the hydraulic oil tank to flow into the oil inlet pipeline in a directional manner. The present invention also provides a hydraulic switch, which is arranged on the oil inlet pipeline of the clutch cylinder. When the solenoid valve 2 is in the open state, the hydraulic oil flows to the rodless chamber or the rod chamber of the clutch cylinder 3 through the hydraulic switch.

[0064] The piston rod is connected to the tension wheel through a connecting rod transmission system, and the clutch cylinder 3 is controlled by the solenoid valve 2. A control device capable of controlling the clutch cylinder is connected to the solenoid valve 2 by signal, and the control device is preferably a button switch. The control device is installed in the harvester cab, and the working state of the clutch cylinder can be switched through the solenoid valve by pressing a button. Compared with the traditional pull rod clutch mechanism, the present invention is simple to operate and easy to use, and can save space for installation in the cab.

[0065] In the present invention, the electro-hydraulic controlled clutch mechanism is provided with a hydraulic drive system, and the tensioning wheel is controlled by the hydraulic drive system to realize the transmission and cutting of power. The system structure of the hydraulic drive system is small in volume, which is convenient for system installation and structural adjustment. The control of the hydraulic drive system can be realized by a button switch device with a relatively simple structure, which can achieve the purpose of simplifying the operation of the clutch mechanism and also reduce the space occupied by the control equipment installed in the cab.

[0066] Based on the above structural design, the present invention further provides a preheating gear connecting line 1 connected to the solenoid valve 2, through which a signal before the engine starts is obtained, and through the preheating gear connecting line 1, the solenoid valve 2 is used to unload the clutch cylinder 3 before the engine starts.

[0067] Generally, before the engine starts, the power supply of the electrical equipment installed on the harvester will switch multiple times. For example, when the harvester is in a dedicated mode, the electrical equipment corresponding to this mode on the harvester is powered. When switching to the next mode, namely the ignition mode, the electrical equipment corresponding to the ignition mode on the harvester starts to be powered.

[0068] It should be noted that in the present invention, the electrical equipment or electrical system on the harvester generally includes an ECU control unit 17, an instrument panel 19, an in-vehicle auxiliary system 20 (such as a radio, interior lighting, etc.), and an out-of-vehicle auxiliary system 21 (such as a horn, wipers, headlights, turn signals, etc.). When the key door is in different gears, the key door can be used to conduct or cut off the circuit of specific electrical equipment or electrical systems.

[0069] In the present invention, according to the setting order of the modes, before the engine starts, the present invention is provided with four modes: locking, dedicated, ignition, and preheating. The preheating gear connecting line 1 provided in the present invention can obtain the power-on state of any one of the above four modes, thereby sending a signal to the solenoid valve 2 before the engine starts, and unloading the clutch cylinder 3 through the solenoid valve 2.

[0070] A preheating gear connection line 1 capable of controlling the solenoid valve 2 is provided, and a signal before the engine is started can be obtained through the preheating gear connection line 1, so that the clutch cylinder 3 is unloaded through the solenoid valve 2 before the engine is started. The present invention optimizes the structure of the hydraulic drive system, has the function of automatic unloading of the header and threshing clutch, obtains the signal before the engine is started through the preheating gear connection line 1, automatically detects, automatically unloads and cuts off the power of the engine and the header transmission and threshing transmission before the engine is started, so that the present invention has the function of preventing the engine from starting with load and protecting the engine.

[0071] The operation mode of the harvester is converted through the key door 10. Specifically, the key door 10 includes a locking gear, a special gear, an ignition gear, a preheating gear and a starting gear according to the twisting start sequence. The engine is started by the starting gear, and the preheating gear of the key door 10 is connected with a preheating gear connecting line 1 (the hot gear connecting line 1 is connected to the preheating gear terminal of the key door). When the key door 10 is in the preheating gear, in addition to realizing the power supply of the electrical equipment corresponding to this position, a circuit is led out through the preheating gear connecting line 1, and the circuit is connected to the solenoid valve 2, and the solenoid valve 2 can be controlled to realize the action of the clutch cylinder. The present invention realizes the linkage control of the hydraulic drive system through the preheating gear connecting line 1.

[0072] In the present invention, the specific structure of the hydraulic drive system is as follows: it includes a hydraulic oil tank, an oil pump, a solenoid valve 2 and a clutch cylinder 3. The hydraulic oil tank includes two oil tank interfaces for hydraulic oil inlet and outlet respectively. The hydraulic pressure of the hydraulic oil is increased by the oil pump, so that the hydraulic oil can be discharged from one of the two oil tank interfaces and returned to the other.

[0073] Specifically, the solenoid valve 2 is a three-position four-way solenoid valve, and the solenoid valve 2 includes a left oil circuit and a right oil circuit. The valve core has three states, namely, the left position, the middle position, and the right position. The valve core moves to the left position or the right position under the action of the magnet coil. When the magnet coil is powered off, the valve core resets to the middle position. When the valve core is in the middle position, the left oil circuit and the right oil circuit are both in a cut-off state.

[0074] The clutch oil cylinder 3 includes a rodless cavity interface and a rod cavity interface. One of the two oil tank interfaces is connected to the left oil circuit, which is connected to the rodless cavity interface. The other of the two oil tank interfaces is connected to the right oil circuit, which is connected to the rod cavity interface. Hydraulic oil can be delivered and returned in the above two oil circuits.

[0075] The present invention is provided with a clutch cylinder 3, the piston rod of the clutch cylinder 3 is connected to the tension wheel, and the tension wheel is driven by the piston rod to tighten or loosen the belt. In order to ensure the stability of the tension wheel state, the present invention is also provided with a hydraulic lock 4 on the hydraulic drive system. The hydraulic lock 4 has two one-way valves respectively arranged on the rod oil inlet branch and the rodless oil inlet branch. The hydraulic drive system is self-locked by the hydraulic lock 4. The hydraulic lock is provided on the hydraulic drive system, so that the present invention can have an electrical interlocking function, thereby improving the stability of the tension wheel state, and further achieving the purpose of improving the operational reliability of the present invention.

[0076] The above-mentioned rodless oil inlet branch specifically refers to the oil circuit connected from the hydraulic oil tank to the rodless chamber of the clutch cylinder in the present invention, and the rod oil inlet branch specifically refers to the oil circuit connected from the hydraulic oil tank to the rod chamber of the clutch cylinder in the present invention.

[0077] The present invention is also provided with a one-way throttle valve 5, which is arranged on the rodless oil inlet branch; when the hydraulic oil flows to the rodless chamber, the throttle hole of the one-way throttle valve 5 is in an effective state, so that the piston rod of the clutch oil cylinder slowly extends; when the hydraulic oil flows to the rod chamber, the throttle hole of the one-way throttle valve 5 is in an invalid state, and the piston rod of the clutch oil cylinder quickly retracts. The one-way throttle valve 5 is used to realize the slow filling of hydraulic oil into the rodless chamber of the clutch oil cylinder 3 and the rapid unloading of oil, so that the tensioning wheel can slowly press the belt, so that the clutch mechanism is slowly engaged, and the transmitter is prevented from being subjected to excessive impact force. At the same time, it can also realize rapid unloading of oil, so that the tensioning wheel can be quickly reset in a short time, and the power output can be quickly cut off. The present invention arranges a one-way throttle valve 5 on the hydraulic drive system. Due to the one-way throttle valve 5, the slow engagement and fast separation of the clutch action process can be realized. The slow engagement of the clutch action can avoid a sudden increase in the engine load to achieve the purpose of protecting the engine and the transmission belt. The fast separation of the clutch action can quickly cut off the power transmission from the engine to the harvesting table and threshing to meet the operating needs in emergency situations.

[0078] A hydraulic switch for controlling the conduction state of the solenoid valve 2 is connected to the solenoid valve 2. The hydraulic switch is a push-button switch hydraulic switch, through which the working state of the solenoid valve 2 can be manually controlled. The present invention adopts push-button switch operation, which is comfortable and convenient to operate, has a simple structure, and is easy to operate the system position layout.

[0079] The preheating gear connecting line 1 and the solenoid valve 2 are used to electrically connect to the magnet coil for realizing the conduction of the left oil circuit, and the preheating gear connecting line 1 is used to realize the rapid oil unloading of the clutch cylinder 3 before the engine is started.

[0080] In order to improve the control accuracy of the present invention, in this embodiment, the present invention also provides a travel switch 6, which is used to detect the position of the piston rod. When the piston rod touches the travel switch 6, the solenoid valve is powered off, the valve core of the solenoid valve is reset, and the pressure oil is cut off from flowing to the clutch cylinder.

[0081] The travel switch 6 is fixedly arranged relative to the harvester, and the setting position of the travel switch 6 is adjustable. The travel switch 6 is fixedly installed according to the compression requirement of the tension wheel on the belt. The travel switch 6 is controlled and connected with the solenoid valve 2. The clutch cylinder 3 drives the tension wheel to compress the belt. After the tension wheel extends to the set position, the travel switch 6 is triggered to start. The travel switch 6 sends a control signal to cut off the power supply of the solenoid valve 2. The solenoid valve 2 resets and cuts off the left and right oil circuits and realizes the oil circuit self-locking through the hydraulic lock 4 to fix the tension wheel.

[0082] The present invention also discloses an engine control system, which includes a starter 7, an engine, a generator 8, a power supply unit 9, a clutch mechanism, a switch control unit 17, a key door 10, etc.

[0083] The core improvement concept of the present invention for the engine control system is as follows: the power supply unit 9, the switch control unit 17, the engine, the solenoid valve 2, and the key door 10 are connected to form a loop; the switch control unit 17 controls the power supply of the power supply unit 9; when the power supply unit 9 supplies power, the key door 10 controls the engine to be in a preheating state, changes the valve core position of the solenoid valve 2, connects the rodless chamber of the clutch cylinder with the hydraulic oil tank, and retracts the piston rod of the clutch cylinder, so that the tensioning wheel leaves the belt between the engine and the actuator.

[0084] The engine is generally a diesel engine, the starter 7 is used to start the engine, and the generator 8 can convert part of the kinetic energy of the engine into electrical energy to supply other electrical equipment.

[0085] The clutch mechanism used in the engine control system provided by the present invention is the electro-hydraulic controlled clutch mechanism as described above.

[0086] The key door 10 includes a locking gear, a special gear, an ignition gear, a preheating gear and a starting gear. The preheating gear of the key door 10 is connected with a preheating gear connecting line 1. The hydraulic drive system includes a hydraulic oil tank, a solenoid valve 2 and a clutch cylinder 3.

[0087] In the present invention, the key door includes: a start gear terminal, which is connected to the power supply unit through the coil of the start relay in the switch control unit 17; one end of the contact of the start relay is connected to the starter in the switch control unit 17, and the starter is connected to the power supply unit; the other end of the contact of the start relay is connected to the power supply unit. Specifically, the key door includes: a preheating gear terminal, which is connected to the solenoid valve, and the solenoid valve is also connected to the power supply unit; an ignition gear terminal, which is connected to the relay of the switch control unit 17, and the ignition gear terminal is also connected to the ignition switch 18 of the control unit 17, and the relay is connected to the power supply unit; a locking gear terminal, which is connected to the power supply unit through a fuse and a fusible link.

[0088] The key door 10 adopts a matrix control circuit structure design, and the X-axis direction of the matrix control circuit is provided with B1 port, B2 port, B3 port, B4 port, and B5 port, and the Y-axis direction of the matrix control circuit is provided with a locking gear, a special gear, an ignition gear, a preheating gear, and a starting gear. Corresponding to the locking gear, the circuit of the B1 port is turned on, corresponding to the special gear, the circuit of the B1 port and the B2 port is turned on, corresponding to the ignition gear, the circuit of the B1 port, the B2 port, and the B3 port is turned on, corresponding to the preheating gear, the circuit of the B1 port, the B3 port, and the B4 port is turned on, and corresponding to the starting gear, the circuit of the B1 port, the B3 port, the B4 port, and the B5 port is turned on. The present invention adopts the extension and retraction of the piston rod to realize the clutch mechanism, and the action sequence control logic can be realized by the structural design of the key door, so that it is convenient to install the preheating gear connecting line 1.

[0089] Based on the above-mentioned key door circuit structure, the electrical circuit connection structure of the present invention is as follows: the negative pole of the power supply unit 9 is connected to the negative pole bus 11, the positive pole of the power supply unit 9 is connected to the B1 port of the key door 10, and the preheating gear connecting line 1 is connected to the B4 port of the key door 10. The preheating gear connecting line 1 is connected to the solenoid valve 2 and then connected to the negative pole bus 11. The starting relay 12 is connected to the B5 port of the start gear of the key door 10. The starting relay 12 is connected to the starter 7. The starter 7 is connected to the positive pole of the power supply unit 9 and the negative pole bus 11, and the generator 8 is connected to the power supply unit 9.

[0090] Specifically, a fusible link 13 is provided between the generator 8 and the positive electrode of the power supply unit 9 .

[0091] Specifically, a first fuse 14 is disposed between the generator 8 and the positive pole of the power supply unit 9 ; and a second fuse 15 is disposed between the positive pole of the power supply unit 9 and the key door 10 .

[0092] Specifically, a power switch 16 is provided between the negative electrode of the power supply unit 9 and the negative electrode bus 11 .

[0093] Through the above three structural optimizations, the reliability of the operation of the electrical circuit in the present invention can be improved.

[0094] The engine control system provided by the present invention has the following control process on a harvester:

[0095] The power supply unit 9 supplies power through the key door 10, and the key door 10 has a plurality of different gears, namely: locking gear, special gear, ignition gear, preheating gear and starting gear. According to the different gears of the key door 10, power can be supplied to the engine, the solenoid valve 2 and other equipment, and the preheating gear connecting line 1 is connected to the B4 port of the key door 10, and the preheating gear connecting line 1 supplies power to a magnet coil of the solenoid valve 2, so that an oil circuit of the solenoid valve 2 can be opened, so that the clutch oil cylinder 3 can unload oil before the engine is started.

[0096] For the solenoid valve 2, the present invention provides three different control schemes, one of which is controlled by the key door 10 mentioned above, another is controlled by a control device (installed in the cab and manually controlled by the operator), and the last one is controlled by a travel switch 6.

[0097] In the present invention, the working principles of the electronic control system and the hydraulic drive system are as follows:

[0098] The working principle of the electronic control system is as follows: before the engine starts, when the operator turns the key from the key door 10 to the preheating and starting process, when the key is in the preheating gear, the engine has not started yet, and the starting motor is in the preheating state. At this time, the current leading to the starter flows to the magnet coil of the solenoid valve 2 at the same time. The magnet coil of the solenoid valve 2 is energized to displace the valve core, thereby making the left oil circuit conductive. At this time, the rodless chamber of the clutch cylinder 3 is connected to the hydraulic oil tank, so that the rodless chamber (pressure chamber) of the cylinder is unloaded, and the tensioning wheel is reset, so as to realize the unloading of the clutch cylinder 3 before the engine starts. After the above actions are completed, the key can switch the key door 10 to the starting gear. At this time, as long as the engine is started and regardless of whether the clutch mechanism is tensioned, the solenoid valve 2 will be energized to automatically perform the safety action of forced unloading, so that the clutch mechanism is in the "off" state. Through the above improvements, the present invention has the function of automatic load detection and automatic unloading before the engine starts, which can protect the engine and avoid the engine starting with load.

[0099] The working principle of the hydraulic drive system is: when the left magnet coil of the solenoid valve 2 is energized, the valve core of the solenoid valve 2 moves, the left oil circuit is connected, and the high-pressure hydraulic oil flows to the rodless chamber of the clutch cylinder 3. During the circulation of the hydraulic oil, the hydraulic oil pushes open the one-way valves on both sides of the hydraulic lock 4, allowing the rodless chamber of the clutch cylinder 3 to enter oil. At the same time, the rod chamber of the clutch cylinder 3 returns oil to the hydraulic oil tank. At this time, the piston rod of the clutch cylinder 3 extends to the right, causing the tensioner to press against the belt (belt tensioning), thereby allowing the engine power to be transmitted to the actuator (cutting table transmission system or threshing transmission system) through the belt to make the actuator work. When the right magnet coil of solenoid valve 2 is energized, the valve core of solenoid valve 2 moves, the right oil circuit is connected, and solenoid valve 2 switches the flow direction of the hydraulic oil. The high-pressure hydraulic oil flows to the rod chamber of the clutch cylinder 3. The hydraulic oil pushes open the one-way valves on both sides of the hydraulic lock 4, allowing oil to flow into the rod chamber of the clutch cylinder 3. At the same time, the rodless chamber returns oil to the hydraulic oil tank. At this time, the piston rod of the clutch cylinder 3 moves back to the left, driving the tensioner to leave the belt, loosening the belt, thereby cutting off the engine power and stopping the actuator.

[0100] By optimizing the design of the hydraulic pipeline, a one-way throttle valve 5 is provided in front of the rodless chamber of the clutch oil cylinder 3 so that the oil cylinder can achieve: when the piston rod moves to the right, the hydraulic oil slows down the piston rod movement through the throttle port, so that the belt tensioner can slowly engage with the belt; when the plug rod moves to the left, the hydraulic oil makes the throttle hole invalid through the one-way valve, and the piston rod movement speed forms a differential (the piston rod retracts faster than it extends). The one-way throttle valve 5 can achieve the tensioner to slowly engage with the belt and quickly separate from the belt.

[0101] In addition, the present invention is also provided with a travel switch 6. When the cylinder piston rod extends and touches the travel switch 6, the magnet coil of the solenoid valve 2 is de-energized, the solenoid valve 2 returns to the middle position, and the hydraulic oil is cut off to realize the positioning stop of the cylinder.

[0102] Based on the above structural design, before starting the engine, the power switch 16 is closed first, and the current of the power supply unit 9 flows to the port B1 of the key door 10. When the driver switches the key from OFF-dedicated-ignition-preheating-starting, the power is connected in sequence through the internal circuit of the key door 10, OFF (B1)-dedicated (B1-B2)-ignition (B1-B2-B3)-preheating (B1-B3-B4)-starting (B1-B3-B4-B5), wherein the B4 port is externally connected to the solenoid valve 2 through the preheating gear connection line 1, so that the solenoid valve 2 is powered earlier than the engine starts, so that the technical requirement of unloading the solenoid valve 2 before the engine starts can be achieved. When the key of the key door 10 is turned from ignition to preheating to starting, the key will rebound to the ignition gear after the action is completed. At this time, the B1-B4 ports are disconnected, and the solenoid valve 2 is not powered. This process meets the working requirement that the solenoid valve 2 is in the middle position to be operated after the engine is started. When the clutch needs to be engaged or disconnected, the solenoid valve 2 can be controlled by the switch. When the key is turned to the ignition position, the current flows through the power supply unit 9-fusible link 13-first fuse 14-key door 10, and the B1-B2-B3 ports on the key door 10 are connected. For the harvester, the instrument panel 19, fan, wiper, and headlight are in the power-on state, and the above electrical components can be controlled by the switch. When the key is turned to the preheating position, the current flows through the power supply unit 9-fusible link 13-first fuse 14-key door 10, the B1-B3-B4 port on the key door 10 is turned on, and the preheating position connecting line 1 set on the B4 port is energized, so that a magnet coil on the solenoid valve 2 is energized. After the solenoid valve 2 is energized, the solenoid valve 2 is shifted to make the hydraulic oil flow to the rod chamber of the clutch cylinder 3, the piston rod retracts and drives the tensioning wheel to press away from the belt, so that the belt is loosened, thereby cutting off the engine power and stopping the actuator. When the key is turned to the start position, the current passes through the key door 10 to realize the conduction of the B1-B3-B4-B5 port, so that the starter relay 12 is energized and closed, and the starter starts to start the engine. When the engine starts, it drives the generator 8 to generate electricity. At this time, the generator 8 generates electricity to supply power to the entire vehicle, and at the same time charges the power supply unit 9; the charging unit includes a battery.

[0103] It should be noted that the above embodiments can be freely combined as needed. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An engine control system, characterized in that: Including electro-hydraulic clutch mechanism, The electro-hydraulic controlled clutch mechanism includes a tensioning wheel, and further includes: A clutch oil cylinder having a rodless chamber and a rod chamber, wherein the rodless chamber and the rod chamber are externally connected with an oil inlet pipeline, and the oil inlet pipeline is connected with a hydraulic oil tank to form a circuit; A solenoid valve, in different working states, the valve core of the solenoid valve is switched to different positions to control the pressure oil of the hydraulic oil tank to flow into the oil inlet pipeline; A hydraulic switch is arranged on the oil inlet pipeline of the clutch oil cylinder; when the solenoid valve is in an open state, the hydraulic oil flows to the rodless chamber or the rod chamber through the hydraulic switch; When the hydraulic oil flows to the rodless chamber, the rod chamber returns oil to the hydraulic oil tank; the piston rod of the clutch cylinder extends, so that the tensioning wheel presses against the belt between the engine and the actuator; When the hydraulic oil flows to the rod chamber, the rodless chamber returns oil to the hydraulic oil tank; The piston rod of the clutch oil cylinder is retracted, so that the tension wheel leaves the belt between the engine and the actuator; It also includes: a preheating gear connecting line connected to the solenoid valve, through which a signal before the engine starts is obtained, and through which the solenoid valve is used to unload the clutch cylinder before the engine starts; It also includes: a travel switch for detecting the position of the piston rod, when the piston rod touches the travel switch, the solenoid valve is powered off, the valve core of the solenoid valve is reset, and the pressure oil is cut off from flowing to the clutch cylinder; The engine control system further includes: The power supply unit, the switch control unit, the engine, the solenoid valve, and the key door are connected to form a circuit; The switch control unit controls the power supply of the power supply unit; When the power supply unit supplies power, the key door controls the engine to be in a preheating state, changes the valve core position of the solenoid valve, connects the rodless chamber of the clutch cylinder with the hydraulic oil tank, and retracts the piston rod of the clutch cylinder, causing the tensioning wheel to leave the belt between the engine and the actuator.

2. The engine control system according to claim 1, characterized in that: The key door comprises: A start-up gear terminal, wherein the start-up gear terminal is connected to the power supply unit through a coil of a start relay in the switch control unit; One end of the contact of the starter relay is connected to the starter in the switch control unit, and the starter is connected to the power supply unit; the other end of the contact of the starter relay is connected to the power supply unit.

3. The engine control system according to claim 1, characterized in that: The key door comprises: A preheating terminal is connected to the solenoid valve, and the solenoid valve is also connected to the power supply unit.

4. The engine control system according to claim 1, characterized in that: The key door comprises: An ignition gear terminal is connected to a relay of the switch control unit, the ignition gear terminal is also connected to an ignition switch of the control unit, and the relay is connected to the power supply unit.

5. The engine control system according to any one of claims 1 to 4, characterized in that: The key door also includes: The locking gear wiring terminal is connected to the power supply unit through a fuse and a fusible link.

6. The engine control system according to claim 1, characterized in that: The oil inlet pipeline comprises: A rodless oil inlet branch connected between the rodless chamber and the hydraulic oil tank; A rod oil inlet branch is connected between the rod chamber and the hydraulic oil tank.

7. The engine control system according to claim 6, characterized in that: Also includes: A one-way throttle valve, arranged on the rodless oil inlet branch; When the hydraulic oil flows to the rodless chamber, the throttle hole of the one-way throttle valve is in an effective state, so that the piston rod of the clutch cylinder slowly extends; When the hydraulic oil flows to the rod chamber, the throttle hole of the one-way throttle valve is in a failed state, and the piston rod of the clutch cylinder retreats quickly.

8. The engine control system according to claim 6, characterized in that: The hydraulic switch comprises: A hydraulic lock with two one-way valves, one one-way valve is arranged on the rodless oil inlet branch, and the other one-way valve is arranged on the rod oil inlet branch; when the solenoid valve is in an open state, the hydraulic oil pushes the one-way valve to be in an open state.

Images