Dual-control fan speed regulating system and automobile crane

Abstract

The utility model discloses a double-control fan speed regulation system and an automobile crane, the double-control fan speed regulation system comprises a fan motor, a hydraulic pump and a pressure control assembly, the hydraulic pump is arranged to be a constant pressure variable pump with output pressure changing in proportion, and the hydraulic pump comprises a pump body and a flow control assembly, the pump body is used for pumping hydraulic oil to the fan motor and provided with a swash plate capable of adjusting output flow, the flow control assembly comprises a variable piston and a flow adjusting valve, the variable piston is used for driving the swash plate, one cavity of the variable piston is communicated with an outlet of the pump body through a flow control oil way, and the flow adjusting valve is arranged on the flow control oil way. The pressure control assembly comprises a proportional pressure reducing valve, the proportional pressure reducing valve is used for adjusting the input oil pressure of the fan motor, and compared with an existing scheme, the dual-control fan speed regulating system can more accurately meet the load requirement, and power loss caused by a high-pressure overflow mode is avoided.

Description

Technical Field

[0001] This utility model belongs to the field of engineering machinery technology, specifically relating to a dual-control fan speed regulation system and a truck crane. Background Technology

[0002] The cooling system of a truck crane generally includes an intercooler and a water-cooler. The intercooler meets the cooling requirements of the engine intake system, while the water-cooler meets the cooling requirements of the engine block and also provides additional functions such as hydraulic torque converter cooling and hydraulic slow-motion cooling. Both intercooler and water-cooler systems typically employ a fan-driven cooling structure. The fan is driven by a hydraulic motor, and the system's cooling capacity is adjusted by controlling the speed of the hydraulic motor. In existing technology, hydraulic motors generally use valve-controlled speed regulation systems, primarily with two approaches: one approach uses a fixed-displacement gear pump, an electro-proportional pressure valve, and a fixed-displacement motor, with the drive pressure controlled by the electro-proportional pressure valve to regulate the motor speed; the other approach uses a constant-pressure variable pump, a speed control valve assembly, and a fixed-displacement motor, with the input flow rate controlled by the speed control valve assembly to regulate the motor speed. However, in practical use, both approaches can only achieve single-function control of flow rate or pressure, resulting in significant power loss. Utility Model Content

[0003] In view of the above-mentioned defects or deficiencies, this utility model provides a dual-control fan speed regulation system and a truck crane, which aims to solve the technical problem of large power loss caused by existing heat dissipation systems.

[0004] To achieve the above objectives, the first aspect of this utility model provides a dual-control fan speed regulation system, wherein the dual-control fan speed regulation system includes a fan motor, a hydraulic pump, and a pressure control component; the hydraulic pump is configured as a constant-pressure variable pump with proportionally varying output pressure, and includes a pump body and a flow control component. The pump body is used to pump hydraulic oil to the fan motor and has a swashplate with adjustable output flow. The flow control component includes a variable piston and a flow regulating valve. The variable piston is used to drive the swashplate, and one chamber of the variable piston is connected to the outlet of the pump body through a flow control oil circuit. The flow regulating valve is located on the flow control oil circuit. The pressure control component includes a proportional pressure reducing valve. The inlet of the proportional pressure reducing valve is connected to the pump body, and the working port of the proportional pressure reducing valve is connected to the inlet of the fan motor. The proportional pressure reducing valve is used to regulate the input oil pressure of the fan motor.

[0005] In this embodiment of the present invention, the fan motor includes a first motor and a second motor, and the pressure control component further includes an oil source switching valve. The first working oil port and the second working oil port of the oil source switching valve are respectively connected to the oil inlets of the first motor and the second motor. The first oil inlet and the second oil inlet of the oil source switching valve are respectively connected to the working oil port of the pump body and the proportional pressure reducing valve. The oil source switching valve is used to select one of the first oil inlet and the second oil inlet to be connected to the first working oil port, and the other to be connected to the second working oil port.

[0006] In this embodiment of the utility model, the first motor is a water-cooled motor, the second motor is an intercooled motor, the oil source switching valve is a solenoid valve, and the oil source switching valve is configured to select the water-cooled motor to be directly connected to the pump body in the power-off state, and to select the intercooled motor to be directly connected to the pump body in the power-on state.

[0007] In this embodiment of the invention, the pressure control component further includes a controller and a temperature sensor. The temperature sensor is used to detect the heat dissipation temperature of the water-cooled motor and the intercooled motor, respectively. The controller is communicatively connected to the temperature sensor and the oil source switching valve, and is used to control the oil source switching valve to be energized or de-energized according to the detection result of the temperature sensor.

[0008] In this embodiment of the invention, there are two variable pistons. One of the two variable pistons is used to drive the swashplate in the forward direction, and the other is used to drive the swashplate in the reverse direction. The flow control oil circuit includes a first branch connected to the rodless chamber of one of the variable pistons and a second branch connected to the rodless chamber of the other variable piston. The flow regulating valve is located on the second branch.

[0009] In this embodiment of the utility model, the flow control oil circuit further includes a third branch, which is connected to the first branch, and a proportional pressure valve is provided on the third branch. The proportional pressure valve is used to control the oil pressure of the third branch, and the flow regulating valve is used to adjust the oil intake of the variable piston connected to the second branch according to the pressure difference between the second branch and the third branch.

[0010] In this embodiment of the utility model, a first pressure guide port and a second pressure guide port for directly detecting pressure difference are respectively provided on both sides of the flow regulating valve. The first pressure guide port is connected to the second branch, and the second pressure guide port is connected to the third branch.

[0011] In this embodiment of the invention, the proportional pressure valve is configured as an electrically controlled inverse proportional pressure valve.

[0012] In this embodiment of the utility model, the dual-control fan speed regulation system also includes an oil replenishment check valve. The oil inlet of the oil replenishment check valve is connected to the return oil circuit of the fan motor, and the oil outlet of the oil replenishment check valve is connected to the oil inlet circuit between the proportional pressure reducing valve and the fan motor.

[0013] To achieve the above objectives, a second aspect of this utility model provides a truck crane, wherein the truck crane includes the dual-control fan speed regulation system described in the above embodiments.

[0014] Through the above technical solutions, the dual-control fan speed regulation system and truck crane provided by this utility model embodiment have the following beneficial effects:

[0015] When using the aforementioned dual-control fan speed control system, which includes a fan motor, hydraulic pump, flow control component, and pressure control component, the fan motor drives the cooling fan to dissipate heat from the cooling system circuit. The hydraulic pump is configured as a constant-pressure variable pump with proportionally varying output pressure and includes a pump body and a flow control component. The pump body pumps hydraulic oil to the fan motor. The variable piston in the flow control component drives the swashplate. The flow regulating valve controls the stroke of the variable piston by controlling the oil pressure of the hydraulic oil entering the variable piston, thereby controlling the variable piston to drive the swashplate of the pump body to rotate, thus controlling the output flow of the pump body. In the pressure control component, the pressure of the hydraulic oil input to the fan motor can be controlled by controlling the pressure difference between the inlet and working port of the proportional pressure reducing valve. Thus, this dual-control fan speed control system can control the speed of the fan motor by adjusting the output flow of the pump body, and can also perform secondary control of the fan motor based on adjusting the output flow of the pump body through proportional pressure reducing valve. Compared with existing solutions, it can more accurately match load requirements and avoid power loss caused by high-pressure overflow.

[0016] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a hydraulic schematic diagram of a dual-control fan speed regulation system according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the layout of the pressure control component according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the layout of a hydraulic pump according to an embodiment of the present invention.

[0021] Explanation of reference numerals in the attached figures

[0022] 1 Fan motor 11 First motor

[0023] 12 Second Motor 2 Pump Body

[0024] 21 Swashplate 3 Flow Control Component

[0025] 31 Variable piston 32 Control oil circuit

[0026] 321 First Branch Road 322 Second Branch Road

[0027] 323 Third branch 33 Flow regulating valve

[0028] 331 First pressure guide port 332 Second pressure guide port

[0029] 34 Proportional pressure valve 4 Pressure control assembly

[0030] 41 Proportional pressure reducing valve 42 Oil source switching valve

[0031] A. First working oil port B. Second working oil port

[0032] P1 First oil inlet; P2 Second oil inlet

[0033] 5. Oil replenishment check valve Detailed Implementation

[0034] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of this utility model.

[0035] The following description, with reference to the accompanying drawings, describes the dual-control fan speed regulation system and the truck crane of this utility model.

[0036] like Figures 1 to 3 As shown, this utility model provides a dual-control fan speed regulation system, wherein the dual-control fan speed regulation system includes:

[0037] Fan motor 1;

[0038] The hydraulic pump is configured as a constant pressure variable pump with proportional output pressure variation, and includes a pump body 2 and a flow control component 3. The pump body 2 is used to pump hydraulic oil to the fan motor 1 and has a swashplate 21 with adjustable output flow. The flow control component 3 includes a variable piston 31 and a flow regulating valve 33. The extension end of the variable piston 31 is drivenly connected to the swashplate 21. One of the chambers of the variable piston 31 is connected to the outlet of the pump body 2 through a flow control oil circuit 32. The flow regulating valve 33 is provided on the flow control oil circuit 32.

[0039] The pressure control component 4 includes a proportional pressure reducing valve 41. The oil inlet of the proportional pressure reducing valve 41 is connected to the pump body 2, and the working oil port of the proportional pressure reducing valve 41 is connected to the oil inlet of the fan motor 1. The proportional pressure reducing valve 41 is used to adjust the input oil pressure of the fan motor 1.

[0040] When using the aforementioned dual-control fan speed control system, which includes a fan motor 1, a hydraulic pump, a flow control component 3, and a pressure control component 4, the fan motor 1 drives a cooling fan to dissipate heat from the cooling system circuit. The hydraulic pump is configured as a constant-pressure variable pump with proportionally varying output pressure and includes a pump body 2 and a flow control component 3. The pump body 2 pumps hydraulic oil to the fan motor 1. The variable piston 31 in the flow control component 3 drives the swashplate 21. The flow regulating valve 33 controls the stroke of the variable piston 31 by controlling the oil pressure of the hydraulic oil entering the variable piston 31, thereby controlling the variable piston 31 to drive the swashplate 21 of the pump body 2 to rotate, thus controlling the output flow of the pump body 2. In the pressure control component 4, the pressure of the hydraulic oil input to the fan motor 1 can be controlled by controlling the pressure difference between the inlet and working port of the proportional pressure reducing valve 41. Therefore, this dual-control fan speed control system can control the speed of the fan motor 1 by adjusting the output flow of the pump body 2, and can also perform secondary control of the fan motor 1 based on adjusting the output flow of the pump body 2 by proportional decompression.

[0041] Understandably, in schemes that use a fixed-displacement gear pump, an electro-proportional pressure valve, and a fixed-displacement motor, where the drive pressure is controlled by the electro-proportional pressure valve to adjust the motor speed, the hydraulic oil supply cannot be provided on demand, meaning it cannot automatically match load requirements. Especially when supply exceeds demand, excess hydraulic oil bypasses the system return oil via high-pressure overflow, causing power loss and hydraulic system overheating. In schemes that use a constant-pressure variable-displacement pump, a speed control valve assembly, and a fixed-displacement motor, where the input flow is controlled by the speed control valve assembly to adjust the motor speed, valve-controlled throttling losses are unavoidable, especially under low-demand conditions. Pressure differentials lead to power loss; when the cooling fan speed decreases, the fixed-displacement motor drive pressure decreases, but the constant-pressure variable-displacement pump maintains a fixed high-pressure output. This results in significant pressure differentials between the compensation valves and main speed control valves in each circuit, leading to substantial power loss. Compared to existing solutions, the dual-control fan speed control system provided by this invention, based on pressure control and flow adaptive matching, can more accurately match load requirements and avoid power losses caused by high-pressure overflow.

[0042] like Figure 1 and Figure 2As shown in this embodiment of the invention, the fan motor 1 includes a first motor 11 and a second motor 12. The pressure control component 4 also includes an oil source switching valve 42. The first working oil port A and the second working oil port B of the oil source switching valve 42 are respectively connected to the oil inlets of the first motor 11 and the second motor 12. The first oil inlet P1 and the second oil inlet P2 of the oil source switching valve 42 are respectively connected to the working oil ports of the pump body 2 and the proportional pressure reducing valve 41. The oil source switching valve 42 is used to select whether one of the first oil inlet P1 and the second oil inlet P2 is connected to the first working oil port A, and whether the other is connected to the second working oil port B. Thus, through the flexible switching of the oil source switching valve 42, independent drive control of the first motor 11 and the second motor 12 and system drive control are realized.

[0043] Specifically, when the output power requirement of the first motor 11 is high, the hydraulic pump directly drives and controls the first motor 11. The hydraulic pump and the proportional pressure reducing valve 41 work together to drive and control the second motor 12, and the proportional pressure reducing valve 41 can reduce the input power of the second motor 12. When the output power requirement of the second motor 12 is high, the working position of the oil source switching valve 42 is switched, and the hydraulic pump directly drives and controls the second motor 12. The hydraulic pump and the proportional pressure reducing valve 41 work together to drive and control the first motor 11, and the proportional pressure reducing valve 41 can reduce the input power of the first motor 11. Thus, by setting the oil source switching valve 42, the output power of the first motor 11 and the second motor 12 can be selected and adjusted according to their specific needs, achieving both proportional regulation of the system pressure and on-demand matching of the system flow.

[0044] It should be noted that, Figure 2 In the middle, the arrow inside the oil source switching valve 42 only indicates the connection between the oil inlet and the working oil port, and does not restrict the specific flow direction of the hydraulic oil.

[0045] In this embodiment of the invention, the first motor 11 is a water-cooled motor, the second motor 12 is an intercooled motor, and the oil source switching valve 42 is a solenoid valve. The oil source switching valve 42 is configured to select direct connection between the water-cooled motor and the pump body 2 in the power-off state, and to select direct connection between the intercooled motor and the pump body 2 in the power-on state. It is understood that the water-cooled motor is used to drive the water-cooled fan for heat dissipation, and the intercooled motor is used to drive the intercooled fan for heat dissipation. Water cooling, in addition to meeting the heat dissipation requirements of the engine block, also needs to meet the additional functions of hydraulic torque conversion cooling and hydraulic slow-speed cooling. Generally, the heat dissipation capacity requirement of the water-cooled fan (i.e., the output power or speed of the water-cooled motor) is greater than that of the intercooled fan. Therefore, under normal circumstances, when the oil source switching valve 42 is de-energized, the water-cooled motor and the pump body 2 are directly connected, which better meets the actual heat dissipation requirements. It should be noted that if, under normal operating conditions, the intercooling heat dissipation requirement is greater than that of the water cooling requirement, then setting the first motor 11 as an intercooled motor is also acceptable.

[0046] In this embodiment of the invention, the pressure control component 4 further includes a controller and a temperature sensor. The temperature sensor is used to detect the heat dissipation temperature of the water-cooled motor and the intercooled motor, respectively. The controller is communicatively connected to both the temperature sensor and the oil source switching valve 42, and is used to control the oil source switching valve 42 to be energized or de-energized based on the detection result of the temperature sensor. Therefore, by setting the temperature sensor and the controller, automatic control of the operating position selection of the oil source switching valve 42 can be achieved based on actual heat dissipation needs.

[0047] Specifically, the heat dissipation temperatures of the water-cooled motor and the intercooled motor represent the temperatures of their respective heat dissipation circuits. If the temperature of the water-cooled heat dissipation circuit is higher than that of the intercooled heat dissipation circuit, the controller controls the oil source switching valve 42 to directly connect the water-cooled motor to the pump body 2; conversely, it controls the oil source switching valve 42 to directly connect the intercooled motor to the pump body 2. This setting is only applicable when the maximum temperature threshold of the water-cooled heat dissipation circuit and the maximum temperature threshold of the intercooled heat dissipation circuit are the same. If the two are different, the controller can also be set to control the oil source switching valve 42 based on the difference between the actual temperature and the maximum temperature threshold. The specific setting can be determined based on actual heat dissipation needs.

[0048] like Figure 1 and Figure 3 As shown in this embodiment of the invention, there are two variable pistons 31. One of the two variable pistons 31 is used to drive the swashplate 21 in the forward direction, and the other is used to drive the swashplate 21 in the reverse direction. The flow control oil circuit 32 includes a first branch 321 communicating with the rodless chamber of one of the variable pistons 31, and a second branch 322 communicating with the rodless chamber of the other variable piston 31. The flow regulating valve 33 is disposed on the second branch 322. By setting two variable pistons 31, the stability and balance of the swashplate 21 during the driving process can be ensured.

[0049] In this embodiment of the invention, the flow control oil circuit 32 further includes a third branch 323, which connects to the first branch 321. A proportional pressure valve 34 is installed on the third branch 323 to control the oil pressure. A flow regulating valve 33 is used to adjust the oil inlet quantity of the variable piston 31 connected to the second branch 322 based on the pressure difference between the second branch 322 and the third branch 323. Therefore, the control of the flow regulating valve 33 is based on the pressure difference between the second branch 322 and the third branch 323, thereby achieving precise adjustment of the variable piston 31.

[0050] Specifically, the proportional pressure valve 34 is an electrically controlled inverse proportional pressure valve. The pressure value of the third branch 323 is set to a constant pressure value, and the pressure of the second branch 322 is the output pressure of the pump body 2, which is set as the system pressure. When it is necessary to reduce the fan speed, the input current of the proportional pressure valve 34 increases, the constant pressure value decreases to a certain specific value, and the current system pressure exceeds the constant pressure value. The flow regulating valve 33 moves to the left working position, the output flow of the pump body 2 decreases, and the fan speed decreases simultaneously until the system pressure decreases to the target constant pressure value. At this point, the flow regulating valve 33 stops regulating, the pump body 2 maintains a specific output flow, and the fan maintains the set target speed. When it is necessary to increase the fan speed, the input current of the proportional pressure valve 34 decreases, the constant pressure value increases to a certain specific value, and the current system pressure is lower than the constant pressure value. The flow regulating valve 33 moves to the right working position, the output flow of the pump body 2 increases, and the fan speed increases simultaneously until the system pressure increases to the target constant pressure value. At this point, the flow regulating valve 33 stops regulating, the pump body 2 maintains a specific output flow, and the fan maintains the set target speed.

[0051] In this embodiment of the invention, the flow regulating valve 33 is provided with a first pressure guide port 331 and a second pressure guide port 332 on both sides for directly detecting the pressure difference. The first pressure guide port 331 is connected to the second branch 322, and the second pressure guide port 332 is connected to the third branch 323. The flow regulating valve 33 can automatically adjust the oil intake of the variable piston 31 according to the difference between the pressure (i.e., system pressure) received by the first pressure guide port 331 and the pressure (i.e., constant pressure value) received by the second pressure guide port 332 and the pressure (i.e., constant pressure value) of the third branch 323. This configuration can reduce the use of electric drive components in the system and reduce the failure rate.

[0052] Of course, this utility model is not limited to this. The flow regulating valve 33 can also be configured as an electrically controlled valve, that is, the electrically controlled drive component in the flow regulating valve 33 can be controlled to switch the working position by detecting the pressure difference between the second branch 322 and the third branch 323. The pressure difference can be detected by setting a pressure gauge, which is a conventional technical choice and will not be described in detail here.

[0053] In this embodiment of the invention, the dual-control fan speed regulation system further includes an oil replenishment check valve 5. The oil inlet of the oil replenishment check valve 5 is connected to the return oil circuit of the fan motor 1, and the oil outlet of the oil replenishment check valve 5 is connected to the oil inlet circuit between the proportional pressure reducing valve 41 and the fan motor 1. The function of the oil replenishment check valve 5 is to prevent cavitation when the oil supply is insufficient during the emergency stop of the motor. Specifically, the first motor 11 and the second motor 12 are each equipped with an oil replenishment check valve 5.

[0054] Specifically, in the dual-control fan speed control system, the proportional pressure valve 34 is an inverse proportional pressure valve 34, whose input current changes inversely proportional to the control pressure. The control process of the dual-control fan speed control system is as follows:

[0055] When the oil source switching valve 42 is de-energized, the input current of the proportional pressure valve 34 increases, the constant pressure value of the hydraulic pump decreases, the target drive pressure of the water-cooled motor decreases, and the speed of the water-cooled fan decreases; the input current of the proportional pressure reducing valve 41 increases, the pressure reducing effect of the proportional pressure reducing valve 41 decreases, the target drive pressure of the intercooled motor increases, and the speed of the intercooled fan increases.

[0056] Similarly, when the oil source switching valve 42 is energized, the input current of the proportional pressure valve 34 increases, the constant pressure value of the hydraulic pump decreases, the target drive pressure of the intercooled motor decreases, and the speed of the intercooled fan decreases; the input current I2 of the proportional pressure reducing valve 41 increases, the pressure reducing effect of the proportional pressure reducing valve 41 decreases, the target drive pressure of the water-cooled motor increases, and the speed of the water-cooled fan increases.

[0057] In summary, this utility model, based on the pump and valve dual control principle of adaptive matching of target pressure and flow, realizes both proportional regulation of system pressure and on-demand matching of system flow. Based on the above technology, it completes the independent and proportional regulation of the speed of multiple fan motors, that is, the speed regulation of each circuit fan is an independent process, that is, the proportional speed regulation of the fan does not depend on the engine speed, nor is it affected by the speed regulation of other circuit fans.

[0058] To achieve the above objectives, the second aspect of this utility model provides a truck crane, wherein the truck crane includes the dual-control fan speed regulation system in the above embodiments. Since the truck crane adopts all the technical solutions of the above embodiments, it has at least the above-mentioned beneficial effects, which will not be elaborated here.

[0059] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0061] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0062] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A dual-control fan speed regulation system, characterized in that, The dual-control fan speed regulation system includes: Fan motor (1); The hydraulic pump is configured as a constant pressure variable pump with proportional output pressure variation, and includes a pump body (2) and a flow control assembly (3). The pump body (2) is used to pump hydraulic oil to the fan motor (1) and has a swashplate (21) with adjustable output flow. The flow control assembly (3) includes a variable piston (31) and a flow regulating valve (33). The variable piston (31) is used to drive the swashplate (21). One of the chambers of the variable piston (31) is connected to the outlet of the pump body (2) through a flow control oil circuit (32). The flow regulating valve (33) is located on the flow control oil circuit (32). The pressure control assembly (4) includes a proportional pressure reducing valve (41), the oil inlet of which is connected to the pump body (2), and the working oil port of which is connected to the oil inlet of the fan motor (1). The proportional pressure reducing valve (41) is used to adjust the input oil pressure of the fan motor (1).

2. The dual-control fan speed regulation system according to claim 1, characterized in that, The fan motor (1) includes a first motor (11) and a second motor (12). The pressure control assembly (4) also includes an oil source switching valve (42). The first working oil port (A) and the second working oil port (B) of the oil source switching valve (42) are respectively connected to the oil inlets of the first motor (11) and the second motor (12). The first oil inlet (P1) and the second oil inlet (P2) of the oil source switching valve (42) are respectively connected to the working oil ports of the pump body (2) and the proportional pressure reducing valve (41). The oil source switching valve (42) is used to select one of the first oil inlet (P1) and the second oil inlet (P2) to be connected to the first working oil port (A) and the other to be connected to the second working oil port (B).

3. The dual-control fan speed regulation system according to claim 2, characterized in that, The first motor (11) is a water-cooled motor, the second motor (12) is an intercooled motor, the oil source switching valve (42) is a solenoid valve, and the oil source switching valve (42) is configured to select the water-cooled motor to be directly connected to the pump body (2) in the power-off state, and to select the intercooled motor to be directly connected to the pump body (2) in the power-on state.

4. The dual-control fan speed regulation system according to claim 3, characterized in that, The pressure control component (4) also includes a controller and a temperature sensor. The temperature sensor is used to detect the heat dissipation temperature of the water-cooled motor and the intercooled motor respectively. The controller is connected to the temperature sensor and the oil source switching valve (42) respectively, and is used to control the oil source switching valve (42) to be energized or de-energized according to the detection result of the temperature sensor.

5. The dual-control fan speed regulation system according to claim 1, characterized in that, The number of variable pistons (31) is two. One of the two variable pistons (31) is used to drive the swashplate (21) in the forward direction, and the other is used to drive the swashplate (21) in the reverse direction. The flow control oil circuit (32) includes a first branch (321) connected to the rodless chamber of one of the variable pistons (31) and a second branch (322) connected to the rodless chamber of the other variable piston (31). The flow regulating valve (33) is provided on the second branch (322).

6. The dual-control fan speed regulation system according to claim 5, characterized in that, The flow control oil circuit (32) further includes a third branch (323), which is connected to the first branch (321). A proportional pressure valve (34) is provided on the third branch (323). The proportional pressure valve (34) is used to control the oil pressure of the third branch (323). The flow regulating valve (33) is used to regulate the oil intake of the variable piston (31) connected to the second branch (322) according to the pressure difference between the second branch (322) and the third branch (323).

7. The dual-control fan speed regulation system according to claim 6, characterized in that, The flow regulating valve (33) is provided with a first pressure guide port (331) and a second pressure guide port (332) on both sides for directly detecting the pressure difference. The first pressure guide port (331) is connected to the second branch (322), and the second pressure guide port (332) is connected to the third branch (323).

8. The dual-control fan speed regulation system according to claim 6, characterized in that, The proportional pressure valve (34) is configured as an electrically controlled inverse proportional pressure valve.

9. The dual-control fan speed regulation system according to any one of claims 1 to 8, characterized in that, The dual-control fan speed regulation system also includes a replenishing oil check valve (5). The oil inlet of the replenishing oil check valve (5) is connected to the return oil circuit of the fan motor (1), and the oil outlet of the replenishing oil check valve (5) is connected to the oil inlet circuit between the proportional pressure reducing valve (41) and the fan motor (1).

10. A truck crane, characterized in that, The truck crane includes a dual-control fan speed regulation system according to any one of claims 1 to 9.

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