An ops solenoid valve control device, method, fork truck

Abstract

The OPS electromagnetic valve control device, method and forklift truck relate to the technical field of forklift electric control systems, and comprise a seat switch module, a valve control switch module, an OPS control module and an OPS electromagnetic valve driving module; the seat switch module is used for detecting whether a driver is in a normal operating position and outputting a seat switch signal; the valve control switch module is used for detecting the operating state of a forklift mast control valve stem and outputting a valve control switch signal; the OPS control module is connected with the seat switch module and the valve control switch module respectively, receives the seat switch signal and the valve control switch signal, and outputs a control instruction according to a preset logic; the OPS electromagnetic valve driving module is electrically connected with the OPS control module, drives the opening and closing of the OPS electromagnetic valve after receiving the control instruction; and the preset logic of the OPS control module is that the opening of the OPS electromagnetic valve is triggered only by the seat switch signal. The present application makes up for the defect of mast descending stability and improves the man-machine engineering in the operation process under the premise of meeting the safety requirements of national standards.

Description

Technical Field

[0001] This invention relates to the field of forklift electronic control system technology, specifically to an OPS solenoid valve control device, method, and forklift. Background Technology

[0002] National standards mandate that ride-on electric forklifts, electro-hydraulic steerable ride-on internal combustion counterbalance forklifts, and electro-hydraulic steerable ride-on internal combustion sidecar forklifts must be equipped with a driver's sitting (standing) posture sensing system. When the driver is not in the normal operating position, the vehicle should not be powered, and even if the load loading / unloading control device is operated, there should be no tilting of the mast or movement of the fork carriage. When the driver returns to the normal operating position but does not perform any additional operations, power operation, mast tilting, and fork carriage movement should not occur automatically. A typical system is an OPS (Operator Presence Sensing) system, which uses a seat sensor installed in the driver's seat to detect whether the driver is sitting in the correct posture. This is a safety system, and the main return port is controlled by a solenoid valve, thereby controlling the movement of the entire mast system.

[0003] Currently, the existing OPS solenoid valve control principle is as follows: Step 1: The system first identifies the seat signal (i.e., detects that the driver is in the seat). After confirming this signal, it then identifies the valve control switch signal or the lifting speed sensor signal. When both signals are identified, the OPS solenoid valve opens, the pump motor operates, and the mast performs the corresponding raising or lowering action. Step 2: If the valve control switch signal is identified first, followed by the seat signal, the solenoid valve remains closed and does not perform the door opening action. Step 3: If the seat signal is identified first, followed by the valve control switch signal, the mast works normally. If the seat signal is lost at this time, the mast stops working. If the seat signal is identified again, the mast still cannot move. The valve control switch must be reset and the signal linkage retried to restore operation.

[0004] In existing applications, the valve stem and valve control switch of the gantry control valve are linked by a mechanical structure. Because the microswitch in the system has a free travel period—meaning the valve stem must be pulled to a specific travel position before the valve control switch can be triggered—the valve port corresponding to the valve control switch has already partially opened (the opening size of the valve port is positively correlated with the valve stem travel). In this situation, if the OPS solenoid valve operates according to the existing principle of "double confirmation of seat signal + valve control signal before opening," it will cause the OPS solenoid valve to suddenly open the main return port when the valve port is already partially open. The gantry will then rapidly unload oil according to the already opened valve port angle, directly causing the gantry to shake during descent. This prevents a smooth and slow descent, severely impacting ergonomics and even posing a safety hazard of cargo swaying. Summary of the Invention

[0005] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes an OPS solenoid valve control device, method, and forklift, which, while meeting national safety standards, compensates for the deficiency in the smoothness of mast descent, and improves the ergonomics of the operation process.

[0006] In view of this, in one aspect, an OPS solenoid valve control device of the present invention includes: The seat switch module is used to detect whether the driver is in a normal operating position and output a seat switch signal; The valve-controlled switch module is used to detect the operating status of the valve stem of the forklift mast control valve and output a valve-controlled switch signal; The OPS control module is connected to the seat switch module and the valve control switch module respectively, receives seat switch signals and valve control switch signals, and outputs control commands according to preset logic; The OPS solenoid valve drive module is electrically connected to the OPS control module and drives the opening and closing of the OPS solenoid valve after receiving the control command. The preset logic of the OPS control module is that the opening of the OPS solenoid valve is triggered only by the seat switch signal.

[0007] According to some embodiments of the present invention, the seat switch module adopts a normally open micro switch, which outputs a high-level seat switch signal when the driver sits in and a low-level seat switch signal when the driver leaves. The valve control switch module adopts a normally open micro switch. When the valve stem is in the neutral position, it outputs a low-level valve control switch signal, and when the valve stem is not in the neutral position, it outputs a high-level valve control switch signal.

[0008] According to some embodiments of the present invention, a lifting speed control sensor module is further included, which is used to detect the adjustment status of the lifting speed of the forklift mast and output a lifting speed control sensor signal. The lifting speed control sensor module is electrically connected to the OPS control module, and the OPS control module receives the lifting speed control sensor signal.

[0009] According to some embodiments of the present invention, a pump motor drive module is further included, which is electrically connected to the OPS control module and the pump motor respectively, and drives the pump motor to start and stop after receiving the control command; the pump motor is started by the joint trigger of "OPS solenoid valve is open" and "valve control switch signal is valid or lifting speed sensor signal is valid".

[0010] According to some embodiments of the present invention, the OPS control module adopts an STM32 series microcontroller, and both the OPS solenoid valve drive module and the pump motor drive module adopt relay drive circuits or MOSFET drive circuits.

[0011] On one hand, an OPS solenoid valve control method of the present invention, employing the above-mentioned OPS solenoid valve control device, includes the following steps: S1: The OPS control module monitors the seat switch signal output by the seat switch module in real time; S2: If the seat switch signal is detected to be valid in step S1, the OPS control module outputs a command to the OPS solenoid valve drive module to control the OPS solenoid valve to open. S3: If the OPS control module detects the valve control switch signal as valid first and then the seat switch signal as valid in step S1, the OPS control module controls the OPS solenoid valve to remain closed and does not control the pump motor to start.

[0012] According to some embodiments of the present invention, S2 further includes S201: after the OPS solenoid valve is opened, the OPS control module detects in real time the valve control switch signal output by the valve control switch module and the lifting speed control sensor signal output by the lifting speed control sensor module. If a valid valve control switch signal or a valid lifting speed control sensor signal is detected, the OPS control module outputs a command to the pump motor drive module to control the pump motor to start.

[0013] According to some embodiments of the present invention, in S201, when the OPS control module detects that the valve control switch signal is invalid, it outputs a command to the pump motor drive module to control the pump motor to stop; the invalid valve control switch signal is the signal output when the valve stem is in the neutral position.

[0014] According to some embodiments of the present invention, in S2, if the seat switch signal becomes invalid after the OPS solenoid valve opens, the OPS control module immediately outputs a command to the OPS solenoid valve drive module to control the OPS solenoid valve to close, and simultaneously outputs a command to the pump motor drive module to control the pump motor to stop; if the seat switch signal subsequently becomes valid again, and the valve control switch signal or the lifting speed sensor signal is valid at this time, the OPS control module re-controls the OPS solenoid valve to open and controls the pump motor to start.

[0015] On the other hand, a forklift of the present invention employs the aforementioned OPS solenoid valve control device, wherein the forklift is a ride-on electric forklift, an electro-hydraulic reversing ride-on internal combustion counterbalance forklift, or an electro-hydraulic reversing ride-on internal combustion sidecar forklift.

[0016] The beneficial effects of this invention are as follows: (1) The present invention optimizes the control logic of the OPS solenoid valve from "double confirmation of seat switch signal + valve control switch signal" to "separate control of seat switch signal", so that the OPS solenoid valve opens in advance and the valve stem operation can adjust the valve port size as needed to achieve smooth discharge and completely avoid the rapid oil unloading vibration caused by the sudden opening of the OPS solenoid valve after the valve port opens in advance in the prior art. (2) In this invention, if the driver is not in the operating position (seat switch signal is invalid), the OPS solenoid valve will always be closed, and even if the valve stem is operated (valve control switch signal is valid), the forklift mast will not move; if the driver returns to the operating position (seat switch signal is valid), the valve stem needs to be operated additionally (valve control switch signal is valid) to trigger the pump motor to work, and the forklift mast will not move automatically, which fully complies with the national standard requirements. (3) In this invention, after the OPS solenoid valve is opened in advance, the driver controls the opening and closing size of the valve port by fine-tuning the valve stem, thereby realizing the micro-motion operation of the forklift mast to descend. The operation accuracy is higher, which can meet the high requirements for stability during the loading and unloading of goods, reduce the driver's operating intensity, and improve the ergonomics.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this drawing or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this drawing. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of an OPS solenoid valve control device according to the present invention. Figure 2 This is a flowchart of an OPS solenoid valve control method according to the present invention. The purpose, features, and advantages of this accompanying drawing will be further explained in conjunction with the embodiments and with reference to the accompanying drawing. Detailed Implementation

[0020] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0021] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0022] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0023] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, and not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0026] In the existing technology, the core control element of the existing forklift OPS system is the OPS solenoid valve, and its control logic is as follows: a) The OPS system prioritizes recognizing the seat signal (i.e., the signal that detects whether the driver is in the normal operating position via the seat switch). After confirming the validity of the seat signal, it then recognizes the valve control switch signal (the signal used to detect the operating status of the gantry control valve stem) or the lifting speed sensor signal (the signal used to detect the lifting speed adjustment status of the gantry). When both the seat signal and the valve control switch signal / lifting speed sensor signal are recognized, the OPS solenoid valve opens, the pump motor starts working, and the gantry performs the corresponding raising or lowering action. b) If the system detects the valve control switch signal first and then the seat signal, the OPS solenoid valve will remain closed and will not perform the door opening action; c) If the system detects the seat signal first and then the valve control switch signal, the mast will work normally; if the seat signal is lost during operation (e.g., the driver leaves the operating position), the mast will stop working immediately; even if the seat signal is subsequently restored (the driver returns to the operating position), the mast will still not be able to move again. The valve control switch must be reset and the signal linkage must be triggered again to resume operation.

[0027] In existing applications, the valve stem of the gantry control valve and the valve-controlled switch are linked mechanically. Due to the inherent free travel of the microswitch, the valve stem must be pulled to a specific position before the valve-controlled switch can be triggered. However, the valve port corresponding to the valve-controlled switch has already partially opened (the opening size is positively correlated with the valve stem travel). In this situation, if the OPS solenoid valve opens only after "double confirmation of seat signal + valve control signal" according to the existing logic, it will cause the OPS solenoid valve to suddenly open the main return port when the valve port is already partially open. The gantry system will then rapidly unload oil at the already opened valve port angle, directly causing the gantry to vibrate during descent. This prevents a smooth and slow descent, severely impacting ergonomics and even posing a safety hazard of cargo swaying.

[0028] To overcome the shortcomings of the prior art mentioned above, see [link to relevant documentation]. Figure 1 As shown, one aspect of the present invention is an OPS solenoid valve control device, which includes a seat switch module, a valve-controlled switch module, an OPS control module, and an OPS solenoid valve drive module.

[0029] The seat switch module is used to detect whether the driver is in a normal operating position and outputs a seat switch signal; The valve-controlled switch module is used to detect the operating status of the valve stem of the forklift mast control valve and output a valve-controlled switch signal; The OPS control module is connected to the seat switch module and the valve control switch module respectively, receives seat switch signals and valve control switch signals, and outputs control commands according to preset logic; The OPS solenoid valve drive module is electrically connected to the OPS control module. After receiving control commands, it drives the opening and closing of the OPS solenoid valve. The default logic of the OPS control module is that the opening of the OPS solenoid valve is triggered only by the seat switch signal.

[0030] In this embodiment, the forklift is an electro-hydraulic reversing ride-on internal combustion counterbalance forklift, and the OPS solenoid valve control device includes a seat switch module, a valve-controlled switch module, an OPS control module, and an OPS solenoid valve drive module.

[0031] The seat switch module is controlled by the seat switch, which is installed under the driver's seat and uses a normally open micro switch. When the driver sits in, the switch closes and outputs a high-level seat signal; when the driver leaves, the switch opens and outputs a low-level seat signal. The valve control switch module is operated by a valve control switch, which is installed on the valve stem linkage mechanism of the gantry control valve. It is a normally open micro switch. When not in operation, the valve stem is in the neutral position, at which time the switch is open and outputs a low-level valve control signal; when the valve stem is pulled up or down, the switch is closed and outputs a high-level valve control signal. The OPS controller uses an STM32F103 microcontroller as the core of the OPS control module. Its input terminals are connected to the seat switch and valve control switch through signal acquisition circuits, and its output terminals are connected to the OPS solenoid valve and pump motor contactor through drive circuits. The OPS solenoid valve is a 4WE6Y type solenoid directional valve, installed on the multi-way valve. It controls the opening and closing of the main oil port to limit the mast's movement. It receives drive signals from the OPS controller, opening when energized and conducting the main return oil port; closing when de-energized and cutting off the main return oil port. In some specific embodiments of the present invention, the seat switch module uses a normally closed microswitch, outputting a high-level seat switch signal when the driver sits in and a low-level seat switch signal when the driver leaves. The valve control switch module uses a normally open micro switch. When the valve stem is in the neutral position, it outputs a low-level valve control switch signal, and when the valve stem is not in the neutral position, it outputs a high-level valve control switch signal.

[0032] Furthermore, the OPS control module is also electrically connected to the lift switch module, tilt switch module, side shift switch module, and attachment switch module, which respectively send lift signals, tilt signals, side shift signals, and attachment signals to the OPS control module. The lift switch module, tilt switch module, side shift switch module, and attachment switch module are all normally closed switches, and are respectively installed on the valve stem linkage mechanism of the forklift mast tilt control valve, side shift control valve, and attachment (e.g., fork or clamp) operation control valve.

[0033] When the driver operates the corresponding valve stem (such as controlling the lifting, tilting, lateral movement of the gantry, or the action of attachments), the valve stem linkage mechanism triggers the micro switch: in the non-operating state (valve stem in the neutral position), the switch outputs a low-level signal; in the operating state (valve stem deviating from the neutral position), the switch outputs a high-level signal.

[0034] These high-level or low-level signals are transmitted to the OPS control module through a signal acquisition circuit to achieve real-time detection of lifting, tilting, lateral movement, and attachment operation status. In some specific embodiments of the present invention, a lifting speed control sensor module is also included, used to detect the adjustment status of the forklift mast lifting speed and output a lifting speed control sensor signal. The lifting speed control sensor module is electrically connected to the OPS control module, and the OPS control module receives the lifting speed control sensor signal.

[0035] In this embodiment, the hoisting speed control sensor module uses a Hall sensor or a photoelectric sensor, which is installed at the gantry hoisting speed control operation component. The hoisting speed control sensor signal output by the module can reflect the driver's adjustment action on the gantry hoisting speed in real time, providing additional basis for the OPS control module to determine whether to start the pump motor.

[0036] In some specific embodiments of the present invention, a pump motor drive module is also included, which is electrically connected to the OPS control module and the pump motor respectively, and drives the pump motor to start and stop after receiving control commands; the pump motor is started by the joint triggering of "OPS solenoid valve is open" and "valve control switch signal is valid or lifting speed sensor signal is valid".

[0037] In this embodiment, the control logic of the pump motor drive module is linked with the status of the OPS solenoid valve and the valve control or lifting speed regulation signal to ensure that the pump motor only starts when the OPS solenoid valve is open and there is a valid operation signal (valve control or lifting speed regulation), thus avoiding unnecessary energy consumption when there is no operation and improving operational safety.

[0038] In some specific embodiments of the present invention, the OPS control module adopts an STM32 series microcontroller, and both the OPS solenoid valve drive module and the pump motor drive module adopt relay drive circuits or MOSFET drive circuits.

[0039] In this embodiment, the OPS control module uses an STM32 series microcontroller, such as the STM32F103, which has high-efficiency processing capabilities and rich I / O interfaces to meet the real-time acquisition and processing requirements of multiple sensor signals. The relay drive circuit or MOSFET drive circuit can stably output sufficient power to ensure the reliable operation of the OPS solenoid valve and pump motor. The hardware solution of both takes into account both control accuracy and drive stability.

[0040] On one hand, an OPS solenoid valve control method of the present invention, employing the above-mentioned OPS solenoid valve control device, includes the following steps: S1: The OPS control module monitors the seat switch signal output by the seat switch module in real time; S2: If the seat switch signal is detected to be valid in step S1, the OPS control module outputs a command to the OPS solenoid valve drive module to control the OPS solenoid valve to open. S3: If the OPS control module detects the valve control switch signal as valid first and then the seat switch signal as valid in step S1, the OPS control module controls the OPS solenoid valve to remain closed and does not control the pump motor to start.

[0041] In this embodiment, the logic design of step S3 is to prevent misoperation: if the valve stem has been operated before the driver is seated (valve control signal is valid), even if the driver is seated later (seat signal is valid), the OPS solenoid valve will remain closed and the pump motor will not be started, thus avoiding accidental mast movement when the driver is not seated stably and improving operational safety.

[0042] The OPS controller has a built-in signal timing judgment unit that records the first trigger timestamp of each signal through a timer. When both the seat signal and the valve control or lifting speed regulation are valid, the timestamps of the two are compared. If the timestamp of the operation signal is earlier than that of the seat signal, it is determined that 'operation first, then seating' is performed, and the S3 logic is executed; otherwise, the S2 logic is executed.

[0043] In some specific embodiments of the present invention, S2 further includes S201: after the OPS solenoid valve is opened, the OPS control module detects in real time the valve control switch signal output by the valve control switch module and the lifting speed control sensor signal output by the lifting speed control sensor module. If a valid valve control switch signal or a valid lifting speed control sensor signal is detected, the OPS control module outputs a command to the pump motor drive module to control the pump motor to start.

[0044] In this embodiment, the detection and control logic of S201 achieves operational continuity. After the OPS solenoid valve is opened, the pump motor is immediately started when the driver performs mast operation (valve stem movement or adjustment of lifting speed) by real-time monitoring of valve control or lifting speed regulation signals, ensuring timely mast action response and meeting the requirements of efficient forklift operation.

[0045] In some specific embodiments of the present invention, in S201, when the OPS control module detects that the valve control switch signal is invalid, it outputs a command to the pump motor drive module to control the pump motor to stop; the invalid valve control switch signal is the signal output when the valve stem is in the neutral position.

[0046] In this embodiment, the pump motor is stopped when the valve control switch signal is invalid (valve stem returns to neutral position). This is based on the dual considerations of energy saving and safety: it avoids the energy waste caused by the pump motor running idle when the valve stem is not operated, and it also prevents the gantry from moving unexpectedly when it is not in operation by cutting off the power source.

[0047] In some specific embodiments of the present invention, in S2, if the seat switch signal becomes invalid after the OPS solenoid valve is opened, the OPS control module immediately outputs a command to the OPS solenoid valve drive module to control the OPS solenoid valve to close, and at the same time outputs a command to the pump motor drive module to control the pump motor to stop; if the seat switch signal subsequently becomes valid, and the valve control switch signal or the lifting speed control sensor signal is valid at this time, the OPS control module re-controls the OPS solenoid valve to open and controls the pump motor to start.

[0048] In this embodiment, when the seat switch signal is invalid (driver leaves), the OPS solenoid valve is immediately closed and the pump motor is stopped. Regardless of whether there is an operation signal at this time, the mast stops moving by cutting off the oil circuit (solenoid valve closes) and power (pump motor stops), preventing the forklift from having an accident after the driver leaves. When the seat signal is restored, and the valve control switch signal or the lifting speed control sensor signal is valid, the OPS control module controls the OPS solenoid valve to open again and controls the pump motor to start, thus ensuring the continuity of operation and not affecting the normal work process.

[0049] Furthermore, in S3, if the OPS control module detects the lifting speed control sensor signal first, and then the seat switch signal, it controls the OPS solenoid valve to remain closed and does not control the pump motor to start.

[0050] On the other hand, a forklift of the present invention employs the aforementioned OPS solenoid valve control device, and the forklift is a ride-on electric forklift, an electro-hydraulic reversing ride-on internal combustion counterbalance forklift, or an electro-hydraulic reversing ride-on internal combustion sidecar forklift.

[0051] The above content is merely a modification or supplement to the structure of the present invention or a similar substitution. As long as it does not deviate from the structure of the invention or exceed the scope defined in the claims, it shall fall within the protection scope of the present invention.

Claims

1. An OPS solenoid valve control device, characterized in that, include: The seat switch module is used to detect whether the driver is in a normal operating position and output a seat switch signal; The valve-controlled switch module is used to detect the operating status of the valve stem of the forklift mast control valve and output a valve-controlled switch signal; The OPS control module is connected to the seat switch module and the valve control switch module respectively, receives seat switch signals and valve control switch signals, and outputs control commands according to preset logic; The OPS solenoid valve drive module is electrically connected to the OPS control module and drives the opening and closing of the OPS solenoid valve after receiving the control command. The preset logic of the OPS control module is that the opening of the OPS solenoid valve is triggered only by the seat switch signal; The seat switch module uses a normally open micro switch, which outputs a high-level seat switch signal when the driver sits in and a low-level seat switch signal when the driver leaves. The valve control switch module adopts a normally open micro switch. When the valve stem is in the neutral position, it outputs a low-level valve control switch signal, and when the valve stem is not in the neutral position, it outputs a high-level valve control switch signal. It also includes a pump motor drive module, which is electrically connected to the OPS control module and the pump motor respectively, and drives the pump motor to start and stop after receiving the control command; the pump motor is started by the combined trigger of "OPS solenoid valve is open" and "valve control switch signal is valid or lifting speed sensor signal is valid"; The control method using the aforementioned OPS solenoid valve control device includes the following steps: S1: The OPS control module monitors the seat switch signal output by the seat switch module in real time; S2: If the seat switch signal is detected to be valid in step S1, the OPS control module outputs a command to the OPS solenoid valve drive module to control the OPS solenoid valve to open. S3: If the OPS control module detects the valve control switch signal as valid first and then the seat switch signal as valid in step S1, the OPS control module controls the OPS solenoid valve to remain closed and does not control the pump motor to start.

2. The OPS solenoid valve control device according to claim 1, characterized in that, It also includes a lifting speed control sensor module, which is used to detect the adjustment status of the lifting speed of the forklift mast and output a lifting speed control sensor signal. The lifting speed control sensor module is electrically connected to the OPS control module, and the OPS control module receives the lifting speed control sensor signal.

3. The OPS solenoid valve control device according to claim 1, characterized in that, The OPS control module uses an STM32 series microcontroller, and both the OPS solenoid valve drive module and the pump motor drive module use relay drive circuits or MOSFET drive circuits.

4. The OPS solenoid valve control device according to claim 1, characterized in that, S2 also includes S201: After the OPS solenoid valve is opened, the OPS control module detects the valve control switch signal output by the valve control switch module and the lifting speed control sensor signal output by the lifting speed control sensor module in real time. If a valid valve control switch signal or a valid lifting speed control sensor signal is detected, the OPS control module outputs a command to the pump motor drive module to control the pump motor to start.

5. The OPS solenoid valve control device according to claim 4, characterized in that, In S201, when the OPS control module detects that the valve control switch signal is invalid, it outputs a command to the pump motor drive module to control the pump motor to stop; the invalid valve control switch signal is the signal output when the valve stem is in the neutral position.

6. The OPS solenoid valve control device according to claim 5, characterized in that, In step S2, if the seat switch signal becomes invalid after the OPS solenoid valve opens, the OPS control module immediately outputs a command to the OPS solenoid valve drive module to control the OPS solenoid valve to close, and simultaneously outputs a command to the pump motor drive module to control the pump motor to stop. If the seat switch signal subsequently becomes valid again, and the valve control switch signal or the lifting speed sensor signal is valid at this time, the OPS control module re-controls the OPS solenoid valve to open and controls the pump motor to start.

7. A forklift employing an OPS solenoid valve control device according to any one of claims 1 to 6, characterized in that, The forklift is a ride-on electric forklift, an electro-hydraulic reversing ride-on internal combustion counterbalance forklift, or an electro-hydraulic reversing ride-on internal combustion sidecar forklift.

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