CN117446708B - Electro-hydraulic control system and method for idling anti-flameout of diesel fork truck - Google Patents
Electro-hydraulic control system and method for idling anti-flameout of diesel fork truck Download PDFInfo
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- CN117446708B CN117446708B CN202311788059.7A CN202311788059A CN117446708B CN 117446708 B CN117446708 B CN 117446708B CN 202311788059 A CN202311788059 A CN 202311788059A CN 117446708 B CN117446708 B CN 117446708B
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- 238000001514 detection method Methods 0.000 claims abstract description 54
- 238000002485 combustion reaction Methods 0.000 claims abstract description 23
- 238000004364 calculation method Methods 0.000 claims description 41
- 230000033001 locomotion Effects 0.000 claims description 20
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 abstract description 13
- 230000008569 process Effects 0.000 abstract description 8
- 238000011217 control strategy Methods 0.000 description 6
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/20—Means for actuating or controlling masts, platforms, or forks
- B66F9/22—Hydraulic devices or systems
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66F—HOISTING, LIFTING, HAULING OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD
- B66F9/00—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes
- B66F9/06—Devices for lifting or lowering bulky or heavy goods for loading or unloading purposes movable, with their loads, on wheels or the like, e.g. fork-lift trucks
- B66F9/075—Constructional features or details
- B66F9/08—Masts; Guides; Chains
- B66F9/082—Masts; Guides; Chains inclinable
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
- F15B21/087—Control strategy, e.g. with block diagram
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Life Sciences & Earth Sciences (AREA)
- Civil Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Geology (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Analytical Chemistry (AREA)
- Forklifts And Lifting Vehicles (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
The invention discloses an idling anti-flameout electrohydraulic control system and method for an internal combustion forklift, which relate to the technical field of forklifts and aim to solve the problem of idling flameout of forklifts, wherein the system comprises an oil pump, a multi-way valve, a lifting oil cylinder, a first pressure sensor, a controller, a first manipulator and a rotating speed sensor; the oil pump is in power connection with the power takeoff and is communicated with the multi-way valve; a lifting oil outlet is arranged on the multi-way valve; the first pressure sensor is used for detecting the pressure of an oil inlet cavity of the lifting oil cylinder; the first manipulator is used for generating a first opening control signal for controlling the opening of the lifting oil outlet; the rotation speed sensor is used for detecting the rotation speed of an engine of the internal combustion forklift; the controller is used for judging whether the forklift is in a loaded working condition or an unloaded working condition according to detection results of the first pressure sensor and the rotating speed sensor, and controlling opening degrees respectively. The invention can prevent the engine from flameout in the process of carrying operation, ensure the action speed in the process of no-load operation, realize operation consistency and improve the operation efficiency.
Description
Technical Field
The invention relates to the technical field of forklifts, in particular to an idling anti-flameout electrohydraulic control system of an internal combustion forklifts. The invention also relates to an idling anti-flameout electrohydraulic control method of the diesel fork truck.
Background
Currently, in the field of engineering vehicles, large-tonnage engineering vehicles such as forklifts and the like commonly adopt an internal combustion type power vehicle body, namely an engine is arranged in the vehicle body. The forklift is an industrial carrying vehicle and is mainly used for lifting, loading and unloading cargoes, stacking, transporting in a short distance and the like.
Fittings such as a main mast and an accessory tool are generally disposed on a forklift body. The main door frame can normally not only perform lifting movement, but also perform overturning movement so as to lift and topple over goods. The accessory tool is mounted on the main door frame, and usually can perform fine movements such as clamping and telescoping. In order to control the actions of components such as a main portal and auxiliary tools, a forklift driver generally carries out remote control in a cockpit through an operator such as an operation handle, and the operator can generate corresponding opening control signals to a multi-way valve in a forklift hydraulic system, so that the opening of an oil outlet of the multi-way valve is controlled, and the flow of the oil outlet of the multi-way valve is controlled, so that the main portal or the auxiliary tools can act quickly.
The working conditions of the forklift are generally divided into two types of on-load working and no-load working, however, the working control system in the prior art does not distinguish between the no-load working condition and the on-load working condition, and uniformly adopts the same control strategy, namely, the control opening of the manipulator is the opening of the oil outlet of the multi-way valve. The control mode can improve the operation speed and ensure the operation efficiency during no-load operation, but during loaded operation, the oil pump of the forklift has larger requirement on the engine torque, and particularly under heavy load, accurate operation is usually required, and the engine rotating speed is not improved at the moment, so if the control opening degree of the manipulator by a forklift driver is larger, the flow requirement of the oil pump is larger, and further, the requirement of the oil pump on the torque becomes larger, the output torque of a PTO (Power Take Off) of a gearbox on the forklift can be exceeded, the normal operation of the engine is influenced, the engine is flameout can be caused, and especially when the engine is in idle working condition, the flameout probability is higher, the operation continuity is influenced, and the operation efficiency is reduced. In the prior art, other part of operation control systems adopt a conservative control strategy in order to prevent the engine from flameout under the heavy-load idle working condition, but influence the action speed during idle operation, so that the idle working efficiency is low.
Therefore, how to prevent the engine from flameout during the on-load operation, and ensure the action speed during the no-load operation, so as to realize the operation consistency and improve the operation efficiency is a technical problem faced by the person skilled in the art.
Disclosure of Invention
The invention aims to provide an idling anti-flameout electrohydraulic control system of an internal combustion forklift, which can prevent an engine from flameout in the process of carrying operation, ensure the action speed in the process of no-load operation, realize operation continuity and improve the operation efficiency. The invention further aims to provide an idling anti-flameout electrohydraulic control method for the diesel fork truck.
In order to solve the technical problems, the invention provides an idling anti-flameout electrohydraulic control system of an internal combustion forklift, which comprises an oil pump, a multi-way valve, a lifting oil cylinder, a first pressure sensor, a controller, a first manipulator and a rotating speed sensor;
the oil pump is in power connection with a power takeoff of a transmission of the diesel fork truck, and an oil outlet of the oil pump is communicated with an oil inlet of the multi-way valve;
the multi-way valve is provided with a lifting oil outlet with an adjustable opening, and the lifting oil outlet is communicated with the lifting oil cylinder;
the output end of the lifting oil cylinder is connected with a main door frame of the diesel fork truck and is used for driving the main door frame to perform lifting movement;
The first pressure sensor is used for detecting the pressure of an oil inlet cavity of the lifting oil cylinder;
the first manipulator is used for generating a first opening control signal for controlling the opening of the lifting oil outlet according to user operation;
the rotating speed sensor is used for detecting the rotating speed of an engine of the internal combustion forklift;
the controller is in signal connection with the control end of the multipath valve, the first pressure sensor, the first manipulator and the rotating speed sensor, and is used for:
judging whether the main door frame is loaded currently or not according to the detection result of the first pressure sensor, and if not, controlling the opening of the lifting oil outlet according to the first opening control signal; if so, calculating the maximum allowable opening of the lifting oil outlet corresponding to the current rotation speed of the engine according to the detection result of the rotation speed sensor, judging whether the target opening corresponding to the first opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the lifting oil outlet according to the first opening control signal; if yes, the opening degree of the lifting oil outlet is kept at the maximum allowable opening degree.
Preferably, the lifting oil outlet is communicated with a rodless cavity of the lifting oil cylinder, and a rod cavity of the lifting oil cylinder is communicated with an oil tank; the first pressure sensor is used for detecting the pressure of the rodless cavity of the lifting oil cylinder.
Preferably, the controller includes:
the first output module is used for judging whether the main door frame is loaded currently according to the detection result of the first pressure sensor, and if not, controlling the opening of the lifting oil outlet according to the first opening control signal;
the first calculation module is used for calculating the output torque of the power takeoff according to the detection result of the rotating speed sensor when the judgment result of the first output module is yes;
the second calculation module is used for calculating the maximum allowable flow of the oil pump according to the detection result of the first pressure sensor and the calculation result of the first calculation module, and converting the maximum allowable flow into the maximum allowable opening of the lifting oil outlet;
the second output module is used for judging whether the target opening corresponding to the first opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the lifting oil outlet according to the first opening control signal; if yes, the opening degree of the lifting oil outlet is kept at the maximum allowable opening degree.
Preferably, the system further comprises a second pressure sensor and a flow sensor;
the second pressure sensor is used for detecting the pressure of an oil outlet of the oil pump, and the flow sensor is used for detecting the flow of the oil outlet of the oil pump;
The second pressure sensor and the flow sensor are connected with the controller in a signal mode, so that the controller checks the actual opening of the lifting oil outlet according to the detection results of the second pressure sensor and the flow sensor.
Preferably, the device further comprises a tilting cylinder and a second manipulator;
the output end of the inclined oil cylinder is connected with the main door frame and is used for driving the main door frame to perform overturning movement;
the multi-way valve is also provided with an inclined oil outlet with an adjustable opening, and the inclined oil outlet is communicated with the inclined oil cylinder;
the second manipulator is used for generating a second opening control signal for controlling the opening of the inclined oil outlet according to user operation;
the controller is in signal connection with the second manipulator for:
judging whether the main door frame is loaded currently or not according to the detection result of the first pressure sensor, and if not, controlling the opening of the inclined oil outlet according to the second opening control signal; if so, calculating the maximum allowable opening of the inclined oil outlet corresponding to the current rotation speed of the engine according to the detection result of the rotation speed sensor, judging whether the target opening corresponding to the second opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the inclined oil outlet according to the second opening control signal; if so, the opening degree of the inclined oil outlet is kept at the maximum allowable opening degree.
Preferably, the controller further comprises:
the third output module is used for judging whether the main door frame is loaded currently according to the detection result of the first pressure sensor, and if not, controlling the opening of the inclined oil outlet according to the second opening control signal;
the third calculation module is used for calculating the output torque of the power takeoff according to the detection result of the rotating speed sensor when the judgment result of the third output module is yes;
the fourth calculation module is used for calculating the maximum allowable flow of the oil pump according to the detection result of the first pressure sensor and the calculation result of the third calculation module, and converting the maximum allowable flow into the maximum allowable opening of the inclined oil outlet according to the maximum allowable flow of the oil pump;
the fourth output module is used for judging whether the target opening corresponding to the second opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the inclined oil outlet according to the second opening control signal; if so, the opening degree of the inclined oil outlet is kept at the maximum allowable opening degree.
Preferably, the hydraulic control system further comprises an accessory oil cylinder and a third manipulator;
the output end of the accessory oil cylinder is connected with an accessory tool on the main door frame and used for driving the accessory tool to perform preset movement;
The multi-way valve is also provided with an accessory oil outlet with an adjustable opening, and the accessory oil outlet is communicated with the accessory oil cylinder;
the third manipulator is used for generating a third opening control signal for controlling the opening of the accessory oil outlet according to user operation;
the controller is in signal connection with the third manipulator for:
judging whether the main door frame is loaded currently according to the detection result of the first pressure sensor, and if not, controlling the opening of the accessory oil outlet according to the third opening control signal; if yes, closing the accessory oil outlet.
The invention also provides an idling anti-flameout electrohydraulic control method of the diesel fork truck, which is applied to the idling anti-flameout electrohydraulic control system of the diesel fork truck, and comprises the following steps:
receiving a first opening control signal; the first opening control signal is used for controlling the opening of a lifting oil outlet on the multi-way valve;
detecting the pressure of an oil inlet cavity of a lifting oil cylinder and the rotating speed of an engine of the internal combustion forklift;
judging whether the main portal of the current internal combustion forklift is loaded or not according to the pressure of the oil inlet cavity of the lifting oil cylinder, and if not, controlling the opening of the lifting oil outlet according to the first opening control signal; if so, calculating the maximum allowable opening of the lifting oil outlet corresponding to the current rotating speed of the engine, judging whether the target opening corresponding to the first opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the lifting oil outlet according to the first opening control signal; if yes, the opening degree of the lifting oil outlet is kept at the maximum allowable opening degree.
Preferably, when it is determined that the target opening corresponding to the first opening control signal is not greater than the maximum allowable opening, the method further includes:
judging whether a detection value of the rotating speed of the engine is in a preset idle speed interval or not, if so, keeping the opening of the lifting oil outlet at a preset fixed opening; if not, controlling the opening of the lifting oil outlet according to the first opening control signal;
the preset fixed opening is the maximum allowable opening corresponding to the minimum value of the preset idle interval.
The invention provides an idling anti-flameout electrohydraulic control system of an internal combustion forklift, which mainly comprises an oil pump, a multi-way valve, a lifting oil cylinder, a first pressure sensor, a controller, a first manipulator and a rotating speed sensor. The oil pump is in power connection with a power takeoff of a transmission of the diesel fork truck, so that partial torque of an engine of the diesel fork truck is output to the oil pump through the power takeoff, and the oil pump is driven to operate. Meanwhile, an oil outlet of the oil pump is communicated with an oil inlet of the multi-way valve, and the oil pump is mainly used for providing pressure oil for the multi-way valve. The multi-way valve is provided with a lifting oil outlet, the opening of the lifting oil outlet is adjustable, and the lifting oil outlet is communicated with the lifting oil cylinder so as to supply oil to the lifting oil cylinder and drive a piston rod of the lifting oil cylinder to move. The multi-way valve is provided with a control end which is connected with the controller in a signal manner so as to receive opening control instructions about the lifting oil outlet sent by the controller. The output end (such as a piston rod of the lifting oil cylinder) is connected with a main door frame of the diesel fork truck and is mainly used for driving the main door frame to perform lifting motion so as to lift the main door frame and the goods arranged on the main door frame to a high position or to lower the main door frame and the goods arranged on the main door frame to a low position. The pressure sensor is mainly used for detecting the pressure of an oil inlet cavity (such as a rodless cavity) of the lifting oil cylinder, namely detecting the load of the lifting oil cylinder and sending the load to the controller in real time. The rotating speed sensor is mainly used for detecting the rotating speed of an engine of the internal combustion forklift and sending the rotating speed to the controller in real time. The first manipulator is mainly used for a user (such as a forklift driver) to operate so as to generate a first opening control signal according to the user operation and send the signal to the controller; the first opening control signal is mainly used for controlling the opening of the lifting oil outlet on the multi-way valve through the controller to realize remote opening control. The controller is connected with the control end of the multipath valve, the first pressure sensor, the first manipulator and the rotating speed sensor in a signal mode, and is mainly used for judging the working condition of the forklift according to the detection result of the first pressure sensor and controlling the opening according to the detection result of the rotating speed sensor. Specifically, whether the current main door frame is loaded or not is judged according to the detection result of the first pressure sensor, if not, no-load operation working conditions are described, at the moment, the opening of the lifting oil outlet is directly controlled according to the first opening control signal, and the lifting speed of the main door frame is ensured; if so, the description is an on-load working condition, at the moment, the maximum allowable opening of the lifting oil outlet corresponding to the current rotating speed of the engine is required to be calculated according to the detection result of the rotating speed sensor, then the target opening of the maximum allowable opening of the lifting oil outlet corresponding to the first opening control signal is compared, and if the maximum allowable opening of the lifting oil outlet is not greater than the target opening of the first opening control signal, the opening of the lifting oil outlet is controlled according to the first opening control signal; if the latter is larger than the former, the opening degree control can not be performed according to the first opening degree control signal, but the opening degree of the lifting oil outlet is kept at the maximum allowable opening degree, so that the engine is prevented from being flameout due to overlarge opening degree.
In this way, when the forklift is in an idle operation condition, the controller directly controls the opening of the lifting oil outlet according to the first opening control signal generated by the first manipulator, so that the opening of the lifting oil outlet is consistent with the control opening of a user, and the main portal frame can be ensured to perform quick lifting action; when the forklift is in the load working condition, the controller firstly needs to combine the detection result of the first pressure sensor and the detection result of the rotating speed sensor to determine the maximum allowable opening of the lifting oil outlet under the condition of the rotating speed of the current engine, and then finally determines the opening of the lifting oil outlet according to the size relation between the target opening corresponding to the first opening control signal and the maximum allowable opening, so that the actual opening of the lifting oil outlet is ensured not to exceed the maximum allowable opening all the time, the requirement of the oil pump on torque is ensured not to exceed the output torque of the power takeoff of the transmission all the time, and the engine is prevented from flameout.
In summary, the idling anti-flameout electrohydraulic control system for the diesel fork truck provided by the invention can prevent the flameout of the engine in the process of carrying operation, ensure the action speed in the process of no-load operation, realize operation consistency and improve the operation efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic system structure of an embodiment of the present invention.
Fig. 2 is a control principle topology of the controller.
Fig. 3 is a schematic block diagram of a controller.
Fig. 4 is a graph showing the correspondence between the rotation speed of the engine and the maximum allowable opening of the lifting oil outlet or the inclined oil outlet during the load operation of the forklift.
Fig. 5 is a flowchart of a method according to an embodiment of the present invention.
Wherein, in fig. 1-3:
the hydraulic control system comprises an oil pump-1, a multi-way valve-2, a lifting oil cylinder-3, a first pressure sensor-4, a controller-5, a first manipulator-6, a rotating speed sensor-7, a second pressure sensor-8, a flow sensor-9, an inclined oil cylinder-10, a second manipulator-11, an accessory oil cylinder-12, a third manipulator-13 and an accessory control valve-14;
Lifting oil outlet-21, inclined oil outlet-22 and accessory oil outlet-23;
the first output module-51, the first calculation module-52, the second calculation module-53, the second output module-54, the third output module-55, the third calculation module-56, the fourth calculation module-57, the fourth output module-58.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a system structure according to an embodiment of the present invention.
In a specific embodiment provided by the invention, the idling anti-flameout electrohydraulic control system of the diesel fork truck mainly comprises an oil pump 1, a multi-way valve 2, a lifting oil cylinder 3, a first pressure sensor 4, a controller 5, a first manipulator 6 and a rotating speed sensor 7.
The oil pump 1 is in power connection with a power take-off of a transmission of the diesel fork truck, so that partial torque of an engine of the diesel fork truck is output to the oil pump 1 through the power take-off, and the oil pump 1 is driven to operate. Meanwhile, an oil outlet of the oil pump 1 is communicated with an oil inlet of the multi-way valve 2, and is mainly used for providing pressure oil for the multi-way valve 2.
The multi-way valve 2 is provided with a lifting oil outlet 21 (A1 shown in fig. 1), the opening of the lifting oil outlet 21 is adjustable (such as by a rotary valve), and the lifting oil outlet 21 is communicated with the lifting oil cylinder 3 to supply oil to the lifting oil cylinder 3 and drive a piston rod of the lifting oil cylinder 3 to move. The multiway valve 2 is provided with a control end which is connected with the controller 5 in a signal manner so as to receive an opening control instruction sent by the controller 5.
The output end (such as a piston rod of the lifting oil cylinder 3) is connected with a main door frame of the diesel fork truck and is mainly used for driving the main door frame to perform lifting motion so as to lift the main door frame and the goods arranged on the main door frame to a high position or lower the main door frame and the goods arranged on the main door frame to a low position.
The pressure sensor is mainly used for detecting the pressure of an oil inlet cavity (such as a rodless cavity) of the lifting oil cylinder 3, namely detecting the load of the lifting oil cylinder 3 and sending the load to the controller 5 in real time.
The rotation speed sensor 7 is mainly used for detecting the rotation speed of an engine of the internal combustion forklift and sending the rotation speed to the controller 5 in real time.
The first manipulator 6 is mainly used for a user (such as a forklift driver) to operate, so as to generate a first opening control signal according to the user operation, and send the signal to the controller 5; the first opening control signal is mainly used for controlling the opening of the lifting oil outlet 21 on the multi-way valve 2 through the controller 5, so as to realize remote opening control.
As shown in fig. 2, fig. 2 is a control principle topology of the controller 5.
The controller 5 is in signal connection with the control end of the multi-way valve 2, the first pressure sensor 4, the first manipulator 6 and the rotating speed sensor 7, and is mainly used for judging the working condition of the forklift according to the detection result of the first pressure sensor 4 and controlling the opening according to the detection result of the rotating speed sensor 7.
Specifically, whether the current main portal is loaded or not is judged according to the detection result of the first pressure sensor 4, if not, no-load operation working conditions are described, at the moment, the opening of the lifting oil outlet 21 is directly controlled according to the first opening control signal, and the lifting speed of the main portal is ensured; if so, the description is a load operation condition, at this time, the maximum allowable opening of the lifting oil outlet 21 corresponding to the current rotation speed of the engine needs to be calculated according to the detection result of the rotation speed sensor 7, then the target opening corresponding to the maximum allowable opening of the lifting oil outlet 21 and the first opening control signal is compared, and if the target opening is not greater than the target opening, the opening of the lifting oil outlet 21 is controlled according to the first opening control signal; if the latter is larger than the former, the opening degree control cannot be performed in accordance with the first opening degree control signal, but the opening degree of the lifting oil outlet 21 is kept at the maximum allowable opening degree, and the engine stall caused by the excessive opening degree is avoided.
In this way, in the idling anti-flameout electrohydraulic control system for the diesel fork truck provided by the embodiment, when the fork truck is in an idle operation working condition, the controller 5 directly controls the opening of the lifting oil outlet 21 according to the first opening control signal generated by the first manipulator 6, so that the opening of the lifting oil outlet 21 is consistent with the control opening of a user, and the main portal frame is ensured to perform quick lifting action; when the forklift is in the load working condition, the controller 5 firstly needs to combine the detection result of the first pressure sensor 4 and the detection result of the rotation speed sensor 7 to determine the maximum allowable opening of the lifting oil outlet 21 under the condition of the rotation speed of the current engine, and then finally determines the opening of the lifting oil outlet 21 according to the size relation between the target opening corresponding to the first opening control signal and the maximum allowable opening, thereby ensuring that the actual opening of the lifting oil outlet 21 always does not exceed the maximum allowable opening, further ensuring that the requirement of the oil pump 1 on torque always does not exceed the output torque of the power takeoff of the transmission, and preventing the engine from flameout.
In summary, the electro-hydraulic control system for preventing idling and flameout of the diesel fork truck provided by the embodiment can prevent the engine from flameout in the on-load operation process, ensure the action speed in the no-load operation process, realize operation consistency and improve the operation efficiency.
In general, the controller 5 may determine the corresponding pilot control valve according to the opening control instruction sent by the multi-way valve 2, and then under the action of the pilot control valve, the pilot control oil acts on the main valve core of the multi-way valve 2, so as to change the opening of the oil outlet of the multi-way valve 2.
In one embodiment of the lifting cylinder 3, two lifting cylinders 3 may be simultaneously provided to be connected to both sides of the main door frame, respectively. Meanwhile, the lifting oil outlet 21 of the multi-way valve 2 is particularly communicated with the rodless cavity of the lifting oil cylinder 3, so that when pressure oil is output, a piston rod of the lifting oil cylinder 3 is driven to extend out, and then the main portal frame is driven to perform lifting movement. Correspondingly, the first pressure sensor 4 is specifically used for detecting the pressure of the rodless cavity of the lifting oil cylinder 3, namely the load of the main portal frame or the gravity of goods. Meanwhile, the rod cavity of the lifting oil cylinder 3 is specifically communicated with the oil tank, so that the lifting oil cylinder 3 forms a single acting cylinder, and the main door frame can descend by means of dead weight after being lifted to a high position, and the multi-way valve 2 is not required to output pressure oil for driving.
As shown in fig. 3, fig. 3 is a schematic block diagram of the controller 5.
In a specific embodiment with respect to the controller 5, the controller 5 mainly comprises a first output module 51, a first calculation module 52, a second calculation module 53 and a second output module 54.
The first output module 51 is mainly configured to determine whether the current main door frame is loaded according to a detection result of the first pressure sensor 4, and if not, control an opening of the lifting oil outlet 21 according to a first opening control signal.
The first calculation module 52 is mainly configured to calculate the output torque of the power take-off according to the detection result of the rotation speed sensor 7 when the determination result of the first output module 51 is yes. Specifically, since there is a certain correspondence between the rotational speed of the engine and the output torque of the engine, the rotational speed of the engine can be obtained only according to the detection result of the rotational speed sensor 7, and the output torque of the transmitter is matched according to the correspondence, so that the output torque of the power take-off of the transmission is finally obtained.
The second calculation module 53 is mainly configured to calculate a maximum allowable flow rate of the oil pump 1 according to the detection result of the first pressure sensor 4 and the calculation result of the first calculation module 52, and convert the maximum allowable flow rate into a maximum allowable opening of the lifting oil outlet 21 according to the maximum allowable flow rate. Specifically, under the condition of certain power, the torque, pressure and flow of the oil pump 1 have the following relations: t=pq/2pi ω. Where T is torque of the oil pump 1, P is pressure, q is flow rate, and ω is rotation speed of the oil pump 1. In this way, after the first calculation module 52 calculates the output torque of the power take-off, it can determine that the maximum torque of the current oil pump 1 is the output torque of the power take-off, and the pressure is determined by the load, which is generally fixed, ω is also known, so that the maximum allowable flow rate of the current oil pump 1 can be calculated, and the opening of the lifting oil outlet 21 is proportional to the flow rate, and the larger the opening is, the larger the flow rate is, so that the corresponding maximum allowable opening of the lifting oil outlet 21 can be converted.
The second output module 54 is mainly configured to determine whether the target opening corresponding to the first opening control signal is greater than the maximum allowable opening calculated by the second calculation module 53, and if not, control the opening of the lifting oil outlet 21 according to the first opening control signal; if so, the opening degree of the lift oil outlet 21 is maintained at the maximum allowable opening degree calculated by the second calculation module 53.
In addition, in order to improve the accuracy of controlling the opening degree of the lifting oil outlet 21, a second pressure sensor 8 and a flow sensor 9 are added in the present embodiment. The second pressure sensor 8 is mainly used for detecting the pressure of the oil outlet of the oil pump 1, the flow sensor 9 is mainly used for detecting the flow of the oil outlet of the oil pump 1, and meanwhile, the second pressure sensor 8 and the flow sensor 9 are both in signal connection with the controller 5 and can send respective detection results to the controller 5 in real time, so that the controller 5 checks the actual opening of the lifting oil outlet 21 according to the detection results of the second pressure sensor 8 and the flow sensor 9 after controlling the opening of the lifting oil outlet 21. Specifically, the actual opening of the lifting oil outlet 21 can be determined according to the detection result of the flow sensor 9, then the actual torque of the oil pump 1 can be calculated according to the detection result of the second pressure sensor 8, and if the calculated actual torque is greater than the output torque of the power takeoff, the controller 5 can also correct by adjusting the opening of the lifting oil outlet 21 to ensure that the actual torque of the oil pump 1 is less than or equal to the output torque of the power takeoff. Of course, the second pressure sensor 8 and the flow sensor 9 may also be used to check the actual opening of the inclined oil outlet 22.
In addition, considering that the main door frame not only can perform lifting movement but also can perform overturning movement, in order to ensure that the engine does not flameout when the main door frame performs load overturning movement and ensure the action speed when the main door frame performs no-load overturning movement, the tilting cylinder 10 and the second manipulator 11 are additionally arranged in the embodiment.
The output end (such as a piston rod of the tilting cylinder 10) is connected with a main door frame of the diesel fork truck, and is mainly used for driving the main door frame to perform tilting motion so as to tilt the main door frame together with goods mounted on the main door frame to dump the goods. Correspondingly, the multiway valve 2 is also provided with an inclined oil outlet 22 (A2 and B2 shown in figure 1), the opening degree of the inclined oil outlet 22 is also adjustable, and the inclined oil outlet 22 is communicated with the inclined oil cylinder 10 so as to supply oil to the inclined oil cylinder 10 and drive a piston rod of the inclined oil cylinder 10 to move. Specifically, two inclined oil outlets 22 are simultaneously arranged, one of the inclined oil outlets is communicated with the rodless cavity of the inclined oil cylinder 10, and the other inclined oil outlet is communicated with the rod cavity of the inclined oil cylinder 10, so that forward and reverse overturning movement of the main portal frame is realized.
The second manipulator 11 is mainly used for being operated by a user to generate a second opening control signal according to the operation of the user and send the signal to the controller 5; the second opening control signal is mainly used for controlling the opening of the inclined oil outlet 22 on the multi-way valve 2 through the controller 5 to realize remote opening control.
The method for controlling the opening of the inclined oil outlet 22 by the controller 5 is the same as the method for controlling the opening of the lifting oil outlet 21 in the previous embodiment, firstly, whether the current main door frame is loaded or not is judged according to the detection result of the first pressure sensor 4, if not, no-load operation working conditions are indicated, and at the moment, the opening of the inclined oil outlet 22 is directly controlled according to the second opening control signal, so that the turnover speed of the main door frame is ensured; if so, the description is a load operation condition, at this time, the maximum allowable opening of the inclined oil outlet 22 corresponding to the current rotation speed of the engine needs to be calculated according to the detection result of the rotation speed sensor 7, then the maximum allowable opening of the inclined oil outlet 22 is compared with the target opening corresponding to the second opening control signal, and if the maximum allowable opening of the inclined oil outlet 22 is not greater than the target opening, the opening of the inclined oil outlet 22 is controlled according to the second opening control signal; if the latter is larger than the former, the opening degree control cannot be performed in accordance with the second opening degree control signal, but the opening degree of the inclined oil outlet 22 is kept at the maximum allowable opening degree, and engine stall due to excessive opening degree is avoided.
In another specific embodiment regarding the controller 5, the controller 5 mainly includes a third output module 55, a third calculation module 56, a fourth calculation module 57, and a fourth output module 58.
The third output module 55 is mainly configured to determine whether the current portal is loaded according to the detection result of the first pressure sensor 4, and if not, control the opening of the inclined oil outlet 22 according to the second opening control signal.
The third calculation module 56 is mainly configured to calculate the output torque of the power takeoff according to the detection result of the rotation speed sensor 7 when the determination result of the third output module 55 is yes, and the specific calculation method is the same as that of the first calculation module 52, and will not be described herein.
The fourth calculation module 57 is mainly configured to calculate the maximum allowable flow rate of the oil pump 1 according to the detection result of the first pressure sensor 4 and the calculation result of the third calculation module 56, and convert the maximum allowable flow rate into the maximum allowable opening of the inclined oil outlet 22 according to the maximum allowable flow rate, and a specific calculation method is the same as that of the second calculation module 53, and will not be described herein.
The fourth output module 58 is mainly configured to determine whether the target opening corresponding to the second opening control signal is greater than the maximum allowable opening calculated by the fourth calculation module 57, and if not, control the opening of the inclined oil outlet 22 according to the second opening control signal; if so, the opening degree of the inclined oil outlet 22 is maintained at the maximum allowable opening degree calculated by the fourth calculation module 57.
Moreover, considering that not only the action of the main door frame on the forklift needs to be remotely controlled by the forklift driver, the action of the auxiliary tool also needs to be remotely controlled by the forklift driver. In this embodiment, an accessory cylinder 12 and a third manipulator 13 are added.
The output end (such as a piston rod of the accessory cylinder 12) is connected to an accessory tool on the main gantry, and is mainly used for driving the accessory tool (such as a fork) to perform preset movements, such as clamping, telescoping and the like. Correspondingly, the multiway valve 2 is also provided with an accessory oil outlet 23 (shown as A3, B3, A4 and B4 in figure 1), the opening degree of the accessory oil outlet 23 is also adjustable, and the accessory oil outlet 23 is communicated with the accessory oil cylinder 12 so as to supply oil to the accessory oil cylinder 12 and drive a piston rod of the accessory oil cylinder 12 to move. Specifically, the accessory oil outlets 23 are provided with four at the same time, and the accessory oil cylinders 12 are provided with two at the same time. Wherein, the A3 port of the multi-way valve 2 is connected to one end of the accessory control valve 14 and the rodless cavity of one of the accessory cylinders 12, the B3 port of the multi-way valve 2 is connected to the other port of the accessory control valve 14 and the rodless cavity of the other accessory cylinder 12, the A4 port of the multi-way valve 2 is connected to the other port of the accessory control valve 14 and the rodless cavity of the other accessory cylinder 12, and the B4 port of the multi-way valve 2 is connected to the rod cavities of the two accessory cylinders 12.
The third manipulator 13 is mainly used for being operated by a user to generate a third opening control signal according to the operation of the user and send the signal to the controller 5; the third opening control signal is mainly used for controlling the opening of the accessory oil outlet 23 on the multi-way valve 2 through the controller 5 to realize remote opening control.
The method for controlling the opening of the accessory oil outlet 23 by the controller 5 is different from the method for controlling the opening of the lifting oil outlet 21 and the inclined oil outlet 22 in the previous embodiment, firstly, whether the current main door frame is loaded is judged according to the detection result of the first pressure sensor 4, and if not, the opening of the accessory oil outlet 23 is controlled according to the third opening control signal; if yes, the accessory oil outlet 23 is directly closed. In this way, the auxiliary tool of the forklift can only act under no-load condition, namely, the auxiliary tool can only act under no-load condition, so that if the loading of the main portal frame is detected, the auxiliary tool oil outlet 23 is directly closed, and the danger caused by the loading of the auxiliary tool is avoided.
The following describes the opening control flow of the controller 5 under different working conditions of the forklift.
As shown in fig. 4, fig. 4 is a graph showing the correspondence between the rotation speed of the engine and the maximum allowable opening of the lifting oil outlet 21 or the inclined oil outlet 22 during the load operation of the forklift.
When the forklift is in the loading lifting working condition: when the rotation speed of the engine is in the range of min-O1, O2-O3 or O3-O4 as shown in FIG. 4, the controller 5 reads the real-time rotation speed of the vehicle engine, calculates the maximum allowable opening (namely opening limit) of the lifting oil outlet 21 according to the load detected by the first pressure sensor 4, and under the condition that the opening is smaller than the maximum allowable opening, the torque required by the oil pump 1 is always lower than the output torque provided by the power takeoff at the current rotation speed. If the opening of the lifting oil outlet 21 is limited to K, executing the opening of the lifting oil outlet 21 according to the control opening corresponding to the first opening control signal when the control opening corresponding to the first opening control signal generated by the first manipulator 6 is smaller than or equal to K; when the control opening corresponding to the first opening control signal generated by the first manipulator 6 is greater than K, the opening of the lifting oil outlet 21 is performed according to K, as shown in the OA section, BC section, and CD section in fig. 4.
When the rotation speed of the engine is within the range of O4-max, the controller 5 reads the real-time rotation speed of the vehicle engine, and calculates the maximum allowable opening of the lifting oil outlet 21 according to the load detected by the first pressure sensor 4, at this time, the maximum allowable opening of the lifting oil outlet 21 has reached the maximum value K3, namely 100% of the opening, so that the situation that the lifting oil outlet 21 is at any opening without opening limitation is equivalent to the situation that the torque required by the oil pump 1 is smaller than the output torque provided by the power takeoff can be ensured, and at this time, the opening of the lifting oil outlet 21 is executed according to the control opening corresponding to the first opening control signal generated by the first manipulator 6, as shown in the DE section shown in fig. 4.
When the rotation speed of the engine is within the range of O1-O2, namely, within the preset idle speed range, the controller 5 reads the real-time rotation speed of the vehicle engine, and then calculates the maximum allowable opening of the lifting oil outlet 21 according to the load detected by the first pressure sensor 4. In the case where the opening degree is smaller than the maximum allowable opening degree, the torque required by the oil pump 1 is always lower than the output torque provided by the power take-off at the current rotation speed. Unlike the other ranges described above, in the idle range, the maximum allowable opening degree does not change with a change in the engine speed, but is always kept at a fixed value, that is, K1. When the control opening corresponding to the first opening control signal generated by the first manipulator 6 is smaller than or equal to K1, executing the opening of the lifting oil outlet 21 according to the control opening corresponding to the first opening control signal; when the control opening corresponding to the first opening control signal generated by the first manipulator 6 is greater than K1, the opening of the lifting oil outlet 21 is performed according to K1, as shown in the AB section shown in fig. 4. By thus setting, by maintaining a constant maximum allowable opening in a certain idling range, it is possible to attenuate or even eliminate the influence due to rapid fluctuation of the idling rotation speed of the engine, and to prevent frequent changes in the opening of the lifting oil outlet 21 due to fluctuation of the idling rotation speed of the engine.
When the forklift is in the idle lifting working condition: at this time, the opening restriction does not exist, the opening of the lifting oil outlet 21 is executed according to the control opening corresponding to the first opening control signal generated by the first manipulator 6, and the torque required by the oil pump 1 under any opening is always smaller than the output torque provided by the power takeoff, so that the main portal frame can perform rapid lifting movement.
When the forklift is in the load descending working condition or the no-load descending working condition: because the lifting oil cylinder 3 is a single acting cylinder, the main door frame descends by means of dead weight without being driven by pressure oil, so that the opening limit does not exist, and the main door frame can be ensured to rapidly descend.
When the forklift is in the load tilting working condition, the control strategy is the same as that of the forklift in the load lifting working condition, and the control strategy belongs to load operation and is not repeated here.
When the forklift is in the idle load tilting working condition, the control strategy is the same as that of the forklift in the idle load lifting working condition, and the control strategy belongs to idle load operation and is not repeated here.
When the forklift is in the auxiliary tool operation, the auxiliary tool of the forklift can only operate under the no-load condition, so that the no-load operation is equivalent, the opening degree limitation does not exist, the opening degree of the auxiliary tool oil outlet 23 is only required to be executed according to the control opening degree corresponding to the third opening degree control signal generated by the third manipulator 13, and the maximum operation speed of the auxiliary tool is ensured.
As shown in fig. 5, fig. 5 is a flowchart of a method according to an embodiment of the present invention.
The embodiment also provides an idling anti-flameout electrohydraulic control method of the diesel fork truck, which mainly comprises three steps of:
s1, receiving a first opening control signal; the first opening control signal is used for controlling the opening of the lifting oil outlet 21 on the multi-way valve 2;
s2, detecting the pressure of an oil inlet cavity of the lifting oil cylinder 3 and the rotating speed of an engine of the internal combustion forklift;
s3, judging whether the main portal of the current internal combustion forklift is loaded or not according to the pressure of the oil inlet cavity of the lifting oil cylinder 3, and if not, controlling the opening of the lifting oil outlet 21 according to a first opening control signal; if so, calculating the maximum allowable opening of the lifting oil outlet 21 corresponding to the current rotation speed of the engine, judging whether the target opening corresponding to the first opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the lifting oil outlet 21 according to the first opening control signal; if so, the opening degree of the lift oil outlet 21 is maintained at the maximum allowable opening degree.
The electro-hydraulic control method for preventing the idling of the internal combustion forklift has the same beneficial effects as the electro-hydraulic control system for preventing the idling of the internal combustion forklift, and is not repeated here.
In step S3, when it is determined that the target opening corresponding to the first opening control signal is not greater than the maximum allowable opening, step S4 is further included: judging whether the detection value of the rotating speed of the engine is in a preset idle speed interval or not, if so, keeping the opening of the lifting oil outlet 21 at a preset fixed opening; if not, controlling the opening of the lifting oil outlet 21 according to the first opening control signal; the preset fixed opening is the maximum allowable opening corresponding to the minimum value of the preset idle interval, namely K1 shown in fig. 4.
Of course, the control method of the opening degree of the lifting oil outlet 21 in step S3 can be equally applied to the inclined oil outlet 22, and the control principle is the same.
The embodiment also provides an internal combustion forklift, which mainly comprises a forklift body, a main portal arranged on the forklift body in a liftable and reversible manner, an accessory tool arranged on the main portal, an engine arranged in the forklift body, a transmission connected with the engine in a power manner, and a working control system arranged on the forklift body, wherein the working control system adopts the technical scheme of the internal combustion forklift idling flameout prevention electrohydraulic control system, so that the internal combustion forklift provided by the embodiment has all technical effects brought by the technical scheme of the embodiment, and is not repeated herein.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The idling flameout prevention electrohydraulic control system of the diesel fork truck is characterized by comprising an oil pump (1), a multi-way valve (2), a lifting oil cylinder (3), a first pressure sensor (4), a controller (5), a first manipulator (6) and a rotating speed sensor (7);
the oil pump (1) is in power connection with a power takeoff of a transmission of the diesel fork truck, and an oil outlet of the oil pump (1) is communicated with an oil inlet of the multi-way valve (2);
the multi-way valve (2) is provided with a lifting oil outlet (21) with an adjustable opening, and the lifting oil outlet (21) is communicated with the lifting oil cylinder (3);
the output end of the lifting oil cylinder (3) is connected with a main door frame of the diesel fork truck and is used for driving the main door frame to perform lifting movement;
The first pressure sensor (4) is used for detecting the pressure of an oil inlet cavity of the lifting oil cylinder (3);
the first manipulator (6) is used for generating a first opening control signal for controlling the opening of the lifting oil outlet (21) according to user operation;
the rotation speed sensor (7) is used for detecting the rotation speed of an engine of the internal combustion forklift;
the controller (5) is in signal connection with the control end of the multi-way valve (2), the first pressure sensor (4), the first manipulator (6) and the rotating speed sensor (7) and is used for:
judging whether the main door frame is loaded currently or not according to the detection result of the first pressure sensor (4), and if not, controlling the opening of the lifting oil outlet (21) according to the first opening control signal; if so, calculating the maximum allowable opening of the lifting oil outlet (21) corresponding to the current rotation speed of the engine according to the detection result of the rotation speed sensor (7), judging whether the target opening corresponding to the first opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the lifting oil outlet (21) according to the first opening control signal; if so, the opening degree of the lifting oil outlet (21) is kept at the maximum allowable opening degree.
2. The diesel fork truck idling anti-flameout electrohydraulic control system according to claim 1, characterized in that the lifting oil outlet (21) is communicated with a rodless cavity of the lifting oil cylinder (3), and a rod cavity of the lifting oil cylinder (3) is communicated with an oil tank; the first pressure sensor (4) is used for detecting the pressure of the rodless cavity of the lifting oil cylinder (3).
3. The diesel fork truck idle speed flameout prevention electro-hydraulic control system according to claim 1, wherein the controller (5) comprises:
the first output module (51) is used for judging whether the main door frame is loaded currently according to the detection result of the first pressure sensor (4), and if not, controlling the opening of the lifting oil outlet (21) according to the first opening control signal;
the first calculation module (52) is used for calculating the output torque of the power takeoff according to the detection result of the rotating speed sensor (7) when the judgment result of the first output module (51) is yes;
the second calculation module (53) is used for calculating the maximum allowable flow of the oil pump (1) according to the detection result of the first pressure sensor (4) and the calculation result of the first calculation module (52), and converting the maximum allowable flow into the maximum allowable opening of the lifting oil outlet (21) according to the maximum allowable flow;
The second output module (54) is used for judging whether the target opening corresponding to the first opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the lifting oil outlet (21) according to the first opening control signal; if so, the opening degree of the lifting oil outlet (21) is kept at the maximum allowable opening degree.
4. The diesel fork truck idling anti-flameout electrohydraulic control system according to claim 1, characterized by further comprising a second pressure sensor (8) and a flow sensor (9);
the second pressure sensor (8) is used for detecting the oil outlet pressure of the oil pump (1), and the flow sensor (9) is used for detecting the oil outlet flow of the oil pump (1);
the second pressure sensor (8) and the flow sensor (9) are connected with the controller (5) in a signal mode, so that the controller (5) checks the actual opening of the lifting oil outlet (21) according to detection results of the second pressure sensor (8) and the flow sensor (9).
5. The diesel fork truck idling anti-flameout electro-hydraulic control system according to any one of claims 1-4, further comprising a tilting cylinder (10) and a second manipulator (11);
The output end of the inclined oil cylinder (10) is connected with the main door frame and is used for driving the main door frame to perform overturning movement;
an inclined oil outlet (22) with an adjustable opening degree is further arranged on the multi-way valve (2), and the inclined oil outlet (22) is communicated with the inclined oil cylinder (10);
the second manipulator (11) is used for generating a second opening control signal for controlling the opening of the inclined oil outlet (22) according to user operation;
the controller (5) is in signal connection with the second manipulator (11) for:
judging whether the main door frame is loaded currently according to the detection result of the first pressure sensor (4), and if not, controlling the opening of the inclined oil outlet (22) according to the second opening control signal; if so, calculating the maximum allowable opening of the inclined oil outlet (22) corresponding to the current rotation speed of the engine according to the detection result of the rotation speed sensor (7), judging whether the target opening corresponding to the second opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the inclined oil outlet (22) according to the second opening control signal; if so, the opening degree of the inclined oil outlet (22) is kept at the maximum allowable opening degree.
6. The diesel fork truck idle speed anti-flameout electro-hydraulic control system according to claim 5, characterized in that said controller (5) further comprises:
the third output module (55) is used for judging whether the main door frame is loaded currently according to the detection result of the first pressure sensor (4), and if not, controlling the opening of the inclined oil outlet (22) according to the second opening control signal;
a third calculation module (56) for calculating the output torque of the power take-off according to the detection result of the rotation speed sensor (7) when the determination result of the third output module (55) is yes;
a fourth calculation module (57) for calculating the maximum allowable flow rate of the oil pump (1) according to the detection result of the first pressure sensor (4) and the calculation result of the third calculation module (56), and converting the maximum allowable flow rate into the maximum allowable opening degree of the inclined oil outlet (22) according to the maximum allowable flow rate;
a fourth output module (58) for judging whether the target opening corresponding to the second opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the inclined oil outlet (22) according to the second opening control signal; if so, the opening degree of the inclined oil outlet (22) is kept at the maximum allowable opening degree.
7. The diesel fork truck idling anti-flameout electrohydraulic control system of claim 5 further including an accessory cylinder (12) and a third manipulator (13);
the output end of the accessory oil cylinder (12) is connected with an accessory tool on the main door frame and is used for driving the accessory tool to perform preset movement;
an accessory oil outlet (23) with an adjustable opening degree is further arranged on the multi-way valve (2), and the accessory oil outlet (23) is communicated with the accessory oil cylinder (12);
the third manipulator (13) is used for generating a third opening control signal for controlling the opening of the accessory oil outlet (23) according to user operation;
the controller (5) is in signal connection with the third manipulator (13) for:
judging whether the main door frame is loaded currently according to the detection result of the first pressure sensor (4), and if not, controlling the opening of the accessory oil outlet (23) according to the third opening control signal; if yes, closing the accessory oil outlet (23).
8. An idling anti-flameout electrohydraulic control method for a diesel fork truck, which is applied to the idling anti-flameout electrohydraulic control system of the diesel fork truck as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:
Receiving a first opening control signal; the first opening control signal is used for controlling the opening of a lifting oil outlet (21) on the multi-way valve (2);
detecting the pressure of an oil inlet cavity of a lifting oil cylinder (3) and the rotating speed of an engine of the internal combustion forklift;
judging whether the main portal of the current internal combustion forklift is loaded or not according to the pressure of the oil inlet cavity of the lifting oil cylinder (3), and if not, controlling the opening of the lifting oil outlet (21) according to the first opening control signal; if so, calculating the maximum allowable opening of the lifting oil outlet (21) corresponding to the current rotating speed according to the rotating speed of the engine, judging whether the target opening corresponding to the first opening control signal is larger than the maximum allowable opening, and if not, controlling the opening of the lifting oil outlet (21) according to the first opening control signal; if so, the opening degree of the lifting oil outlet (21) is kept at the maximum allowable opening degree.
9. The internal combustion forklift idle speed flameout prevention electro-hydraulic control method according to claim 8, wherein when judging that the target opening corresponding to the first opening control signal is not greater than the maximum allowable opening, further comprising:
Judging whether a detection value of the rotating speed of the engine is in a preset idle speed interval or not, if so, keeping the opening of the lifting oil outlet (21) at a preset fixed opening; if not, controlling the opening of the lifting oil outlet (21) according to the first opening control signal;
the preset fixed opening is the maximum allowable opening corresponding to the minimum value of the preset idle interval.
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