A positive flow controller

Abstract

The application relates to a positive flow controller, comprising a gating circuit, a control circuit and a driving circuit, a first end of the gating circuit is connected with an output end of a pressure sensor, a second end of the gating circuit is connected with a first end of the control circuit, a second end of the control circuit is connected with a first end of the driving circuit, and a second end of the driving circuit is connected with a solenoid valve of a hydraulic pump; in the application, the control circuit controls the conduction of a passage corresponding to the type of the pressure sensor in the gating circuit according to a received pressure sensor type instruction, so that the pressure signals collected by pressure sensors of different types can be transmitted to the control circuit through corresponding passages, automatic adaptation of pressure sensors of different types can be realized, the compatibility of the positive flow controller can be improved, and the development cost of the positive flow controller can be effectively reduced.

Description

Technical Field

[0001] This application relates to the field of flow control technology, and in particular to a positive flow controller. Background Technology

[0002] In hydraulic excavators and other construction machinery, positive flow control is an important hydraulic control method. It uses pressure sensors to detect the pressure signal of the hydraulic system in real time to adjust the output displacement of the hydraulic pump, thereby achieving power matching and energy-saving control.

[0003] Traditional positive flow controllers are typically designed for a single type of pressure sensor (such as resistive, current-type, or voltage-type), and their internal hardware circuitry is designed for that specific type of sensor. However, in practical applications, excavators from different manufacturers or models may be equipped with different types of pressure sensors. For example, some excavators are equipped with resistive pressure sensors that output a resistance signal, while others may be equipped with current-type or voltage-type pressure sensors that output a current signal or a voltage signal. This results in traditional positive flow controllers requiring customized hardware circuitry for adaptation, leading to poor compatibility and high development costs. Utility Model Content

[0004] To address the aforementioned technical problems, the purpose of this application is to provide a positive flow controller that can automatically adapt to different types of pressure sensors, improve the compatibility of the positive flow controller, and effectively reduce the development cost of the positive flow controller.

[0005] The technical solution provided in this application is as follows: A positive flow controller includes: a gating circuit, a control circuit, and a drive circuit; The first terminal of the gating circuit is connected to the output terminal of the pressure sensor. The second terminal of the gating circuit is connected to the first terminal of the control circuit; The second terminal of the control circuit is connected to the first terminal of the drive circuit; The second end of the drive circuit is connected to the solenoid valve of the hydraulic pump. The control circuit is used to output a gating control signal according to the received pressure sensor type instruction; The gating circuit is used to turn on the corresponding path in the gating circuit according to the gating control signal, receive the pressure signal collected by the pressure sensor and output it. The control circuit is further configured to obtain a target driving current based on the pressure signal, and output a first driving control signal based on the target driving current. The drive circuit is used to adjust the opening degree of the solenoid valve according to the first drive control signal.

[0006] Optionally, it also includes: a current acquisition circuit; The second terminal of the driving circuit is connected to the first terminal of the current acquisition circuit. The second terminal of the current acquisition circuit is connected to the solenoid valve; The third terminal of the current acquisition circuit is connected to the third terminal of the control circuit; The current acquisition circuit is used to acquire the actual driving current output from the drive circuit to the solenoid valve, and output the acquired actual driving current. The control circuit is further configured to obtain a deviation value based on the actual drive current and the target drive current, and if the deviation value exceeds a preset deviation range, output a second drive control signal so that the deviation value between the actual drive current and the target drive current output by the drive circuit after being controlled by the second drive control signal is within the preset deviation range.

[0007] Optionally, there are multiple pressure sensors and gating circuits, and the controller further includes a serial-to-parallel conversion circuit; The first terminal of each of the aforementioned gating circuits is connected to each of the aforementioned pressure sensors in a one-to-one correspondence. The second terminals of the plurality of gating circuits are connected to the first terminal of the control circuit; The third terminals of the plurality of gating circuits are connected to the first terminal of the serial-to-parallel conversion circuit; The second terminal of the serial-to-parallel conversion circuit is connected to the fourth terminal of the control circuit; The control circuit is specifically used to output a serial gating control signal according to the received pressure sensor type instruction; The serial-to-parallel conversion circuit is used to convert the serial gating control signal into multiple parallel gating control signals and output them to each of the gating circuits. Each of the aforementioned gating circuits is specifically used to turn on the corresponding path in each of the aforementioned parallel gating control signals, receive the pressure signals collected by each of the aforementioned pressure sensors, and output them to the control circuit.

[0008] Optionally, it also includes: an interface and a power conversion circuit; The power output terminal of the interface is connected to the power input terminal of the drive circuit and the input terminal of the power conversion circuit. The output terminal of the power conversion circuit is connected to the power input terminals of each of the gating circuits, the control circuit, the current acquisition circuit, and the conversion circuit. The interface is used to receive the input power supply voltage and output the received power supply voltage to the drive circuit and the power conversion circuit. The power conversion circuit is used to receive the power supply voltage and convert the power supply voltage into a supply voltage for output.

[0009] Optionally, the power conversion circuit includes: a first power conversion circuit and a second power conversion circuit; The input terminal of the first power conversion circuit is connected to the power output terminal of the interface; The output terminal of the first power conversion circuit is connected to the power input terminal of the current acquisition circuit and the input terminal of the second power conversion circuit. The output terminal of the second power conversion circuit is connected to the power input terminals of each of the gating circuits, the control circuit, and the conversion circuit. The first power conversion circuit is used to receive the power supply voltage and convert the power supply voltage into a first supply voltage for output. The second power conversion circuit is used to receive the first power supply voltage and convert the first power supply voltage into a second power supply voltage for output, wherein the power supply voltage includes the first power supply voltage and the second power supply voltage.

[0010] Optionally, it may also include: a protection circuit; The input terminal of the protection circuit is connected to the power output terminal of the interface; The output terminal of the protection circuit is connected to the input terminal of the first power conversion circuit; The protection circuit is used to suppress transient voltages of the power input from the interface and output the power voltage after transient voltage suppression. When the input current value reaches or exceeds the rated value, the path between the interface and the first power conversion circuit is disconnected.

[0011] Optionally, it may also include: a filter circuit; The input terminal of the filter circuit is connected to the output terminal of the protection circuit; The output terminal of the filter circuit is connected to the input terminal of the first power conversion circuit; The filtering circuit is used to filter the power supply voltage after the transient voltage is suppressed, and output the filtered power supply voltage.

[0012] Optionally, the selection circuit includes: a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a first transient diode, a first Zener diode, a second Zener diode, a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor. The first end of the first resistor, the first end of the first transient diode, the first end of the sixth resistor, and the first end of the eighth resistor are connected to the output end of the pressure sensor. The second end of the first resistor is connected to the first end of the first switching transistor; The second terminal of the first switching transistor is connected to the first terminal of the second resistor, and the common terminal of the connection is used to input the second supply voltage; The third terminal of the first switching transistor is connected to the second terminal of the second resistor and the first terminal of the third resistor; The second end of the third resistor is connected to the first end of the second switching transistor; The second terminal of the second switch is connected to the first terminal of the fourth resistor, and the common terminal of the connection is grounded. The third terminal of the second switch is connected to the second terminal of the fourth resistor and the first terminal of the fifth resistor; The second terminal of the fifth resistor is connected to the first sub-terminal of the serial-to-parallel conversion circuit; The second end of the eighth resistor is connected to the first end of the third switch transistor; The second terminal of the third switch is connected to the first terminal of the ninth resistor, and the common terminal of the connection is grounded. The third terminal of the third switch is connected to the second terminal of the ninth resistor and the first terminal of the tenth resistor. The second terminal of the tenth resistor is connected to the second sub-terminal of the serial-to-parallel conversion circuit; The second end of the sixth resistor is connected to the first end of the eleventh resistor and the first end of the seventh resistor; The second end of the eleventh resistor is connected to the first end of the fourth switch transistor; The second terminal of the fourth switch is connected to the first terminal of the twelfth resistor, and the common terminal of the connection is grounded. The third terminal of the fourth switch is connected to the second terminal of the twelfth resistor and the first terminal of the thirteenth resistor; The second terminal of the thirteenth resistor is connected to the third terminal of the series-parallel conversion circuit; The second end of the seventh resistor is connected to the anode of the first Zener diode, the cathode of the second Zener diode, the first end of the first capacitor, and the first end of the fourteenth resistor, and the common end of the five connections is connected to the first end of the control circuit. The cathode of the first Zener diode is used to input the second power supply voltage; The anode of the second Zener diode is connected to the second terminal of the first capacitor and the second terminal of the fourteenth resistor, and the common terminal of the three connections is grounded. The first terminal of the serial-to-parallel conversion circuit includes a first sub-terminal to a third sub-terminal.

[0013] Optionally, the selection circuit further includes: a fifth switch, a sixth switch, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, and a nineteenth resistor, wherein the resistance values ​​of the first resistor and the fifteenth resistor are different; The first end of the fifteenth resistor is connected to the output end of the pressure sensor; The second end of the fifteenth resistor is connected to the first end of the fifth switching transistor; The second terminal of the fifth switch is connected to the first terminal of the sixteenth resistor, and the common terminal of the connection is used to input the second power supply voltage. The third terminal of the fifth switch is connected to the second terminal of the sixteenth resistor and the first terminal of the seventeenth resistor; The second end of the seventeenth resistor is connected to the first end of the sixth switch transistor; The second terminal of the sixth switch is connected to the first terminal of the eighteenth resistor, and the common terminal of the connection is grounded. The third terminal of the sixth switch is connected to the second terminal of the eighteenth resistor and the first terminal of the nineteenth resistor; The second terminal of the nineteenth resistor is connected to the fourth sub-terminal of the series-parallel conversion circuit; The first terminal of the serial-to-parallel conversion circuit also includes a fourth sub-terminal.

[0014] Optionally, the serial-to-parallel conversion circuit includes: a serial-to-parallel converter, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, and a twenty-third resistor; The first to fourth terminals of the serial-to-parallel converter serve as the first to fourth sub-terminals of the serial-to-parallel conversion circuit. The fifth terminal of the serial-to-parallel converter is connected to the first terminal of the twentieth resistor; The second end of the twentieth resistor is connected to the first sub-terminal of the control circuit; The sixth terminal of the serial-to-parallel converter is connected to the first terminal of the twenty-first resistor; The second terminal of the 21 resistor is connected to the second sub-terminal of the control circuit, wherein the fourth terminal of the control circuit includes the first sub-terminal and the second sub-terminal. The seventh terminal of the serial-to-parallel converter is connected to the first terminal of the twenty-second resistor; The second end of the 22nd resistor is connected to the eighth end of the serial-to-parallel converter, and the common end of the connection is used to input the second supply voltage; The ninth terminal of the serial-to-parallel converter is connected to the first terminal of the twenty-third resistor; The second terminal of the 23rd resistor is used to input the second supply voltage; The tenth and eleventh terminals of the serial-to-parallel converter are connected, and the common terminal of the connection is grounded. The twelfth terminal of the serial-to-parallel converter is grounded.

[0015] Compared with the prior art, the positive flow controller provided in this application includes: a gating circuit, a control circuit, and a drive circuit. The first terminal of the gating circuit is connected to the output terminal of a pressure sensor, the second terminal of the gating circuit is connected to the first terminal of the control circuit, the second terminal of the control circuit is connected to the first terminal of the drive circuit, and the second terminal of the drive circuit is connected to the solenoid valve of a hydraulic pump. The control circuit is used to output a gating control signal according to the received pressure sensor type instruction. The gating circuit is used to conduct the corresponding path in the gating circuit according to the gating control signal, receive and output the pressure signal collected by the pressure sensor. The control circuit is also used to obtain a target drive current according to the pressure signal and output a first drive control signal according to the target drive current. The drive circuit is used to adjust the opening degree of the solenoid valve according to the first drive control signal. In this application, the control circuit controls the conduction of the path in the gating circuit corresponding to the pressure sensor type according to the received pressure sensor type instruction, so that the pressure signals collected by different types of pressure sensors can be transmitted to the control circuit through the corresponding path. This enables automatic adaptation to different types of pressure sensors, improves the compatibility of the positive flow controller, and effectively reduces the development cost of the positive flow controller. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a first structural block diagram of a positive flow controller provided in the embodiments of this application; Figure 2 This is a second structural block diagram of a positive flow controller provided in the embodiments of this application; Figure 3 This is a third structural block diagram of a positive flow controller provided in an embodiment of this application; Figure 4 This is a fourth structural block diagram of a positive flow controller provided in an embodiment of this application; Figure 5 This is a circuit diagram of the gating circuit provided in the embodiments of this application; Figure 6 This is a circuit diagram of the serial-to-parallel conversion circuit provided in the embodiments of this application; Figure 7 This is a circuit diagram of the driving circuit provided in the embodiments of this application; Figure 8 This is a circuit diagram of the first current acquisition circuit provided in the embodiments of this application; Figure 9 The circuit diagrams are of the protection circuit, filtering circuit, and first power conversion circuit provided in the embodiments of this application. Figure 10 This is a circuit diagram of the second power conversion circuit provided in the embodiments of this application; Figure 11 This is a circuit diagram of the control circuit provided in the embodiments of this application; Reference numerals: 100-Pressure sensor; 210-Gating circuit; 220-Control circuit; 230-Drive circuit; 240-Current acquisition circuit; 250-Serial-to-parallel conversion circuit; 260-Interface; 270-Power conversion circuit; 280-Protection circuit; 290-Filtering circuit; 300-Solenoid valve; 101-Boom recovery pilot pressure sensor; 102-Boom tilt pilot pressure sensor; 103-Boom lifting pilot pressure sensor; 104-Boom lowering pilot pressure sensor; 105-Bug digging pilot pressure sensor; 106-Bug tilt pilot pressure sensor; 107-Swing pilot pressure sensor; 108-Left travel pilot pressure sensor; 109-Right travel pilot pressure sensor; 110-Front pump pressure sensor; 111-Rear pump pressure sensor; 112-Engine speed sensor; 241 - First current acquisition circuit; 242 - Second current acquisition circuit; 271 - First power conversion circuit; 272 - Second power conversion circuit; 310 - Front pump solenoid valve; 320 - Rear pump solenoid valve; M1 - First switching transistor; M2 - Second switching transistor; M3 - Third switching transistor; M4 - Fourth switching transistor; TVS1 - First transient diode; ZD1 - First Zener diode; ZD2 - Second Zener diode; C1 - First capacitor; R1 - First resistor; R2 - Second resistor; R3 - Third resistor; R4 - Fourth resistor; R5 - Fifth resistor; R6 - Sixth resistor; R7 - Seventh resistor; R8 - Eighth resistor; R9 - Ninth resistor; R10 - Tenth resistor; R11 - Eleventh resistor; R12 - Twelfth resistor; R13 - Thirteenth resistor; R14 - Fourteenth resistor; M5 - Fifth switching transistor; M6 - Sixth switching transistor; R15 - Fifteenth resistor; R16 - Sixteenth resistor; R17 - Seventeenth resistor; R18 - Eighteenth resistor; R19 - Nineteenth resistor; U1 - Serial-to-parallel converter; R20 - Twentieth resistor; R21 - Twenty-first resistor; R22 - Twenty-second resistor; R23 - Twenty-third resistor; U2 - Driver; R24 - Twenty-fourth resistor; R25 - Twenty-fifth resistor; R26 - Twenty-sixth resistor; R27 - Twenty-seventh resistor; R28 - Twenty-eighth resistor; R29 - Twenty-ninth resistor; R30 - Thirtieth resistor; R21 - Thirty-first resistor; R32 - Thirty-second resistor; U3 - First current collector; R33 - Thirty-third resistor; C2 - Second capacitor; C3 - Third capacitor; C4 - Fourth capacitor; C5 - Fifth capacitor; U4 - First power converter; C6 - Sixth capacitor; C7 - Seventh capacitor; C8 - Eighth capacitor; C9 - Ninth capacitor; C10 - Tenth capacitor; C11 - Eleventh capacitor; C12 - Twelfth capacitor; C13 - Thirteenth capacitor; R34 - Thirty-fourth resistor; R35 - Thirty-fifth resistor; R36 - Thirty-sixth resistor; R37 - Thirty-seventh resistor; R38 - Thirty-eighth resistor; R39 - Thirty-ninth resistor; R40 - Fortieth resistor; L1 - First inductor; D1 - First diode; D2 - Second diode; LED1 - Light-emitting diode; U5 - Second power converter; C14 - Fourteenth capacitor; C15 - Fifteenth capacitor; C16 - Sixteenth capacitor; C17 - Seventeenth capacitor; TVS2 - Second transient diode; TVS3 - Third transient diode; F1 - Fuse; C18 - Eighteenth capacitor; C19 - Nineteenth capacitor; C20 - Twentieth capacitor; C21 - Twenty-first capacitor; L2 - Second inductor; D3 - Third diode; U6 - Central Processing Unit; C22 - Twenty-second Capacitor; C23 - Twenty-third Capacitor; C24 - Twenty-fourth Capacitor; C25 - Twenty-fifth Capacitor; Y1 - Crystal Oscillator; R41 - Forty-first Resistor. Detailed Implementation

[0018] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0020] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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 limitations on this application.

[0021] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0022] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0023] like Figure 1As shown in the figure, this application embodiment provides a positive flow controller, including: a gating circuit 210, a control circuit 220, and a drive circuit 230; the first end of the gating circuit 210 is connected to the output end of the pressure sensor 100; the second end of the gating circuit 210 is connected to the first end of the control circuit 220; the second end of the control circuit 220 is connected to the first end of the drive circuit 230; the second end of the drive circuit 230 is connected to the solenoid valve 300 of the hydraulic pump; the control circuit 220 is used to output a gating control signal according to the received pressure sensor 100 type command; the gating circuit 210 is used to conduct the corresponding path in the gating circuit 210 according to the gating control signal, receive the pressure signal collected by the pressure sensor 100 and output it; the control circuit 220 is also used to obtain the target drive current according to the pressure signal, and output a first drive control signal according to the target drive current; the drive circuit 230 is used to adjust the opening degree of the solenoid valve 300 according to the first drive control signal.

[0024] In this embodiment, the pressure sensor 100 type command can be sent by a human-machine interface, a host computer, or other electronic devices. The control circuit 220 receives the pressure sensor 100 type command and, based on the received command, outputs a gating control signal to the gating circuit 210. The gating circuit 210 receives the gating control signal from the control circuit 220 and, based on the received signal, activates the path in the gating circuit 210 corresponding to the pressure sensor 100 type, receiving the pressure signal collected by the pressure sensor 100 and outputting it to the control circuit 220 through the path corresponding to the pressure sensor 100 type. This allows different types of pressure sensors 100 to interact. The pressure signal collected by the sensor 0 can be transmitted to the control circuit 220 through the corresponding path, enabling automatic adaptation to different types of pressure sensors 100. The control circuit 220 receives the pressure signal sent by the gating circuit 210, obtains the target drive current based on the received pressure signal, and outputs a first drive control signal to the drive circuit 230 based on the target drive current. The drive circuit 230 receives the first drive control signal sent by the control circuit 220, and outputs a drive current to the solenoid valve 300 of the hydraulic pump based on the first drive control signal. The valve core opening of the solenoid valve 300 is adjusted to control the output displacement of the hydraulic pump. Specifically, the solenoid valve 300 can be a proportional solenoid valve 300, and the drive current can be a PWM (Pulse Width Modulation) signal.

[0025] Compared with the prior art, the positive flow controller provided in this application includes: a gating circuit 210, a control circuit 220, and a drive circuit 230. The first terminal of the gating circuit 210 is connected to the output terminal of the pressure sensor 100, the second terminal of the gating circuit 210 is connected to the first terminal of the control circuit 220, the second terminal of the control circuit 220 is connected to the first terminal of the drive circuit 230, and the second terminal of the drive circuit 230 is connected to the solenoid valve 300 of the hydraulic pump. The control circuit 220 is used to output a gating control signal according to the received type command from the pressure sensor 100. The gating circuit 210 is used to open the corresponding path in the gating circuit 210 according to the gating control signal, and receive the pressure signal collected by the pressure sensor 100. The output control circuit 220 is also used to obtain the target drive current based on the pressure signal and output the first drive control signal based on the target drive current. The drive circuit 230 is used to adjust the opening degree of the solenoid valve 300 based on the first drive control signal. In this application, the control circuit 220 controls the passage in the gating circuit 210 corresponding to the type of pressure sensor 100 to be turned on according to the received pressure sensor 100 type instruction, so that the pressure signals collected by different types of pressure sensors 100 can be transmitted to the control circuit 220 through the corresponding passage. This enables automatic adaptation to different types of pressure sensors 100, improves the compatibility of the positive flow controller, and effectively reduces the development cost of the positive flow controller.

[0026] like Figure 2 As shown, in one embodiment, this application further includes: a current acquisition circuit 240; a second terminal of the drive circuit 230 connected to a first terminal of the current acquisition circuit 240; a second terminal of the current acquisition circuit 240 connected to a solenoid valve 300; and a third terminal of the current acquisition circuit 240 connected to a third terminal of the control circuit 220. The current acquisition circuit 240 is used to acquire the actual drive current output from the drive circuit 230 to the solenoid valve 300 and output the acquired actual drive current. The control circuit 220 is also used to obtain a deviation value based on the actual drive current and the target drive current. If the deviation value exceeds a preset deviation range, a second drive control signal is output so that the deviation value between the actual drive current and the target drive current output by the drive circuit 230 after being controlled by the second drive control signal is within the preset deviation range.

[0027] In this embodiment, the preset deviation range is a pre-set deviation range. The current acquisition circuit 240 acquires the actual driving current output from the drive circuit 230 to the solenoid valve 300 and outputs the acquired actual driving current to the control circuit 220. The control circuit 220 obtains the deviation value between the actual driving current and the target driving current based on the actual driving current and the target driving current acquired by the current acquisition circuit 240. If the deviation value exceeds the preset deviation range, a corrected control signal, namely the second drive control signal, is generated and sent to the drive circuit 230. The drive circuit 230 adjusts the output according to the corrected control signal so that the deviation value between the adjusted output actual driving current and the target driving current is within the preset deviation range. This enables high-precision closed-loop control, reduces the current deviation caused by power fluctuations, coil temperature drift, or load changes, reduces the impact of hysteresis or nonlinearity that may exist in the current-opening characteristics of the solenoid valve 300, and ensures that the valve core opening of the solenoid valve 300 strictly corresponds to the command.

[0028] like Figure 2 As shown in the embodiment, in this application embodiment, there are multiple pressure sensors 100 and gating circuits 210, and the controller further includes: a serial-to-parallel conversion circuit 250; the first terminal of each gating circuit 210 is connected to each pressure sensor 100 in a one-to-one correspondence; the second terminal of each gating circuit 210 is connected to the first terminal of the control circuit 220; the third terminal of each gating circuit 210 is connected to the first terminal of the serial-to-parallel conversion circuit 250; the second terminal of the serial-to-parallel conversion circuit 250 is connected to the fourth terminal of the control circuit 220; the control circuit 220 is specifically used to output a serial gating control signal according to the received pressure sensor 100 type instruction; the serial-to-parallel conversion circuit 250 is used to convert the serial gating control signal into multiple parallel gating control signals and output them to each gating circuit 210; each gating circuit 210 is specifically used to conduct the corresponding path in each gating circuit 210 according to each parallel gating control signal, receive the pressure signal collected by each pressure sensor 100 and output it to the control circuit 220.

[0029] In this embodiment, there are N pressure sensors 100 and gating circuits 210, where N is a positive integer greater than 1. By setting up a serial-to-parallel conversion circuit 250, the pressure on the input / output pins (IO pins) of the control device in the control circuit 220 can be effectively reduced, and scalability can be increased.

[0030] like Figure 3As shown, in one embodiment, this application further includes: an interface 260 and a power conversion circuit 270; the power output terminal of the interface 260 is connected to the power input terminal of the drive circuit 230 and the input terminal of the power conversion circuit 270; the output terminal of the power conversion circuit 270 is connected to the power input terminals of each gating circuit 210, control circuit 220, current acquisition circuit 240 and serial-to-parallel conversion circuit 250; the interface 260 is used to receive the input power voltage and output the received power voltage to the drive circuit 230 and the power conversion circuit 270; the power conversion circuit 270 is used to receive the power voltage and convert the power voltage into a supply voltage for output.

[0031] In this embodiment, interface 260 receives the input power supply voltage and outputs the received power supply voltage (such as DC24V) to the power input terminal of drive circuit 230 to power drive circuit 230, and outputs it to power conversion circuit 270. Power conversion circuit 270 converts the power supply voltage into a supply voltage to power each selection circuit 210, control circuit 220, current acquisition circuit 240 and serial-to-parallel conversion circuit 250.

[0032] like Figure 3 As shown, in one embodiment of this application, the power conversion circuit 270 includes: a first power conversion circuit 271 and a second power conversion circuit 272; the input terminal of the first power conversion circuit 271 is connected to the power output terminal of the interface 260; the output terminal of the first power conversion circuit 271 is connected to the power input terminal of the current acquisition circuit 240 and the input terminal of the second power conversion circuit 272; the output terminal of the second power conversion circuit 272 is connected to the power input terminals of each gating circuit 210, control circuit 220 and serial-to-parallel conversion circuit 250; the first power conversion circuit 271 is used to receive the power supply voltage and convert the power supply voltage into a first supply voltage for output; the second power conversion circuit 272 is used to receive the first supply voltage and convert the first supply voltage into a second supply voltage for output, wherein the supply voltage includes the first supply voltage and the second supply voltage.

[0033] In this embodiment, the first power conversion circuit 271 receives a power supply voltage (e.g., DC24V) and converts it into a first supply voltage (e.g., DC5V), which is output to the power input terminal of the current acquisition circuit 240 to power the current acquisition circuit 240. It also outputs the first power conversion circuit 272 to the second power conversion circuit 272. The second power conversion circuit 272 receives the first supply voltage and converts it into a supply voltage (e.g., DC3.3V), which is output to the power input terminals of each gating circuit 210, control circuit 220, and serial-to-parallel conversion circuit 250 to power the gating circuit 210, control circuit 220, and serial-to-parallel conversion circuit 250.

[0034] like Figure 3 As shown, in one embodiment, this application further includes: a protection circuit 280; the input terminal of the protection circuit 280 is connected to the power output terminal of the interface 260; the output terminal of the protection circuit 280 is connected to the input terminal of the first power conversion circuit 271; the protection circuit 280 is used to suppress transient voltages of the power input from the interface 260 and output the power voltage after transient voltage suppression, and disconnects the path between the interface 260 and the first power conversion circuit 271 when the input current value reaches or exceeds the rated value.

[0035] In this embodiment, the protection circuit 280 suppresses transient voltages of the power input from the interface 260, effectively suppressing voltage surges (such as instantaneous high voltage caused by lightning strikes) and avoiding the risk of damage to subsequent circuits due to instantaneous high voltage. When the input current value reaches or exceeds the rated value, the path between the interface 260 and the first power conversion circuit 271 is disconnected, effectively avoiding the risk of damage to the first power conversion circuit 271 and subsequent circuits due to overcurrent.

[0036] like Figure 3 As shown, in one embodiment, this application further includes: a filter circuit 290; the input terminal of the filter circuit 290 is connected to the output terminal of the protection circuit 280; the output terminal of the filter circuit 290 is connected to the input terminal of the first power conversion circuit 271; the filter circuit 290 is used to filter the power supply voltage after transient voltage suppression and output the filtered power supply voltage.

[0037] In this embodiment, the filter circuit 290 can eliminate noise, electromagnetic interference, or environmental radiation noise in the input power supply, and can prevent noise from coupling to other circuits.

[0038] like Figure 5As shown, in one embodiment of this application, the selection circuit 210 includes: a first switch M1, a second switch M2, a third switch M3, a fourth switch M4, a first transient diode TVS1, a first Zener diode ZD1, a second Zener diode ZD2, a first capacitor C1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, and a fourteenth resistor R14; the first terminal of the first resistor R1, the first terminal of the first transient diode TVS1, the first terminal of the sixth resistor R6, and the first terminal of the eighth resistor R8 are connected to the output terminal of the pressure sensor 100 via the AI15 signal line; the second terminal of the first resistor R1 is connected to the first terminal of the first switch M1; the second terminal of the first switch M1 is connected to the first terminal of the second resistor R2, and the common terminal of the two connections is used to input a second supply voltage (e.g., 3).(3V); the third terminal of the first switch M1 is connected to the second terminal of the second resistor R2 and the first terminal of the third resistor R3; the second terminal of the third resistor R3 is connected to the first terminal of the second switch M2; the second terminal of the second switch M2 is connected to the first terminal of the fourth resistor R4, and the common terminal of the two connections is grounded; the third terminal of the second switch M2 is connected to the second terminal of the fourth resistor R4 and the first terminal of the fifth resistor R5; the second terminal of the fifth resistor R5 is connected to the first sub-terminal of the serial-to-parallel conversion circuit 250 through the NTC-100-ON1 signal line; the second terminal of the eighth resistor R8 is connected to the first terminal of the third switch M3; the second terminal of the third switch M3 is connected to the first terminal of the ninth resistor R9, and the common terminal of the two connections is grounded; the third terminal of the third switch M3 is connected to the second terminal of the ninth resistor R9 and the first terminal of the tenth resistor R10; the second terminal of the tenth resistor R10 is connected to the second sub-terminal of the serial-to-parallel conversion circuit 250 through the I-ON1 signal line; the second terminal of the sixth resistor R6 is connected to the first terminal of the eleventh resistor R11 and the first terminal of the eleventh resistor R11; The first terminal of the seventh resistor R7 is connected to the first terminal of the eleventh resistor R11; the second terminal of the eleventh resistor R11 is connected to the first terminal of the fourth switch M4; the second terminal of the fourth switch M4 is connected to the first terminal of the twelfth resistor R12, and the common terminal of the two connections is grounded; the third terminal of the fourth switch M4 is connected to the second terminal of the twelfth resistor R12 and the first terminal of the thirteenth resistor R13; the second terminal of the thirteenth resistor R13 is connected to the third sub-terminal of the serial-to-parallel conversion circuit 250 through the 5V-ON1 signal line; the second terminal of the seventh resistor R7 is connected to the anode of the first Zener diode ZD1, the cathode of the second Zener diode ZD2, the first terminal of the first capacitor C1, and the first terminal of the fourteenth resistor R14, and the common terminal of the five connections is connected to the first terminal of the control circuit 220; the cathode of the first Zener diode ZD1 is used to input the second supply voltage; the anode of the second Zener diode ZD2 is connected to the second terminal of the first capacitor C1 and the second terminal of the fourteenth resistor R14, and the common terminal of the three connections is grounded; wherein, the first terminal of the serial-to-parallel conversion circuit 250 includes the first sub-terminal to the third sub-terminal.

[0039] In this embodiment, the first switch M1 to the fourth switch M4 can be MOS transistors (i.e., metal-oxide-semiconductor field-effect transistors) or transistors, preferably MOS transistors. Specifically, the first switch M1 is a PMOS transistor, and the second switch M2 to the fourth switch M4 are NMOS transistors. When the pressure sensor 100 is a resistive pressure sensor, the first sub-terminal of the serial-to-parallel conversion circuit 250 outputs a high-level signal to the second terminal of the fifth resistor R5 through the NTC-100-ON1 signal line. Since the gate-source voltage difference of the second switch M2 is greater than the threshold voltage, the second switch M2 is turned on. When the second switch M2 is turned on, the drain voltage of the second switch M2 is pulled down to near ground level, and the gate voltage of the first switch M1 is reduced to below the source voltage (3.3V). The first switch M1 is turned on, and the pressure signal collected by the resistive pressure sensor 100 is input through the AI15 signal line. The collected pressure signal is output to the first terminal of the control circuit 220 through the AD15 signal line. When the pressure sensor 100 is a current-type pressure sensor 100, the second sub-terminal of the serial-to-parallel conversion circuit 250 outputs a high-level signal to the second terminal of the tenth resistor R10 through the I-ON1 signal line. Since the gate-source voltage difference of the third switch M3 is greater than the threshold voltage, the third switch M3 is turned on. The pressure signal collected by the current-type pressure sensor 100 is input through the AI15 signal line, and the collected pressure signal is output to the first terminal of the control circuit 220 through the AD15 signal line. When the pressure sensor 100 is a voltage-type pressure sensor, the third sub-terminal of the serial-to-parallel conversion circuit 250 outputs a high-level signal to the second terminal of the thirteenth resistor R13 through the 5V-ON1 signal line. Since the gate-source voltage difference of the fourth switch M4 is greater than the threshold voltage, the fourth switch M4 is turned on. The voltage signal collected by the voltage-type pressure sensor 100 is input through the AI15 signal line, and the collected pressure signal is output to the first terminal of the control circuit 220 through the AD15 signal line.

[0040] like Figure 5As shown, in one embodiment of this application, the selection circuit 210 further includes: a fifth switch M5, a sixth switch M6, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, and a nineteenth resistor R19. The first resistor R1 and the fifteenth resistor R15 have different resistance values. The first terminal of the fifteenth resistor R15 is connected to the output terminal of the pressure sensor 100 via the AI15 signal line. The second terminal of the fifteenth resistor R15 is connected to the first terminal of the fifth switch M5. The second terminal of the fifth switch M5 is connected to the first terminal of the sixteenth resistor R16, and the common terminal connecting the two is used to input the second... Supply voltage; the third terminal of the fifth switch M5 is connected to the second terminal of the sixteenth resistor R16 and the first terminal of the seventeenth resistor R17; the second terminal of the seventeenth resistor R17 is connected to the first terminal of the sixth switch M6; the second terminal of the sixth switch M6 is connected to the first terminal of the eighteenth resistor R18, and the common terminal of the two connections is grounded; the third terminal of the sixth switch M6 is connected to the second terminal of the eighteenth resistor R18 and the first terminal of the nineteenth resistor R19; the second terminal of the nineteenth resistor R19 is connected to the fourth sub-terminal of the serial-to-parallel conversion circuit 250 through the NTC-1000-ON1 signal line; wherein, the first terminal of the serial-to-parallel conversion circuit 250 also includes the fourth sub-terminal.

[0041] In this embodiment, specifically, the resistance value of the first resistor R1 can be 100Ω, and the resistance value of the sixth resistor R6 can be 1000Ω. When the pressure sensor 100 is a resistive pressure sensor 100 with a resistance range of 0 to 100Ω, the first sub-terminal of the serial-to-parallel conversion circuit 250 outputs a high-level signal to the second terminal of the fifth resistor R5 through the NTC-100-ON1 signal line. Since the gate-source voltage difference of the second switch M2 is greater than the threshold voltage, the second switch M2 is turned on. When the second switch M2 is turned on, the drain voltage of the second switch M2 is pulled down to near ground level, and the gate voltage of the first switch M1 is reduced to below the source voltage (3.3V). The first switch M1 is turned on, and the pressure signal collected by the pressure sensor 100 is input through the AI15 signal line, and the collected pressure signal is output to the first terminal of the control circuit 220 through the AD15 signal line. When the pressure sensor 100 is a resistive pressure sensor with a resistance range of 0 to 1000Ω, the fourth sub-terminal of the serial-to-parallel conversion circuit 250 outputs a high-level signal to the second terminal of the nineteenth resistor R19 through the NTC-1000-ON1 signal line. Since the gate-source voltage difference of the sixth switch M6 is greater than the threshold voltage, the sixth switch M6 is turned on. When the sixth switch M6 is turned on, the drain voltage of the sixth switch M6 is pulled down to near ground level, and the gate voltage of the fifth switch M5 is reduced to below the source voltage (3.3V). The fifth switch M5 is turned on, and the pressure signal collected by the pressure sensor 100 is input through the AI15 signal line. The collected pressure signal is output to the first terminal of the control circuit 220 through the AD15 signal line.

[0042] like Figure 6 As shown, in one embodiment of this application, the serial-to-parallel conversion circuit 250 includes: a serial-to-parallel converter U1, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, and a twenty-third resistor R23; pins 4, 6, 7, and 5 of the first to fourth terminals of the serial-to-parallel converter U1 serve as the first to fourth sub-terminals of the serial-to-parallel conversion circuit 250; pin 22 of the fifth terminal of the serial-to-parallel converter U1 is connected to the first terminal of the twentieth resistor R20; the second terminal of the twentieth resistor R20 is connected to the first sub-terminal of the control circuit 220 via an SCL signal line; pin 23 of the sixth terminal of the serial-to-parallel converter U1 is connected to the first terminal of the twenty-first resistor R21; the second terminal of the twenty-first resistor is connected to the SDA signal line... The line is connected to the second sub-terminal of the control circuit 220, wherein the fourth terminal of the control circuit 220 includes a first sub-terminal and a second sub-terminal; the seventh pin 1 of the serial-parallel converter U1 is connected to the first terminal of the twenty-second resistor R22; the second terminal of the twenty-second resistor R22 is connected to the eighth pin 24 of the serial-parallel converter U1, and the common terminal of the connection is used to input the second supply voltage (3.3V); the ninth pin 21 of the serial-parallel converter U1 is connected to the first terminal of the twenty-third resistor R23; the second terminal of the twenty-third resistor R23 is used to input the second supply voltage; the tenth pin 2 and the eleventh pin 3 of the serial-parallel converter U1 are connected, and the common terminal of the connection is grounded; the twelfth pin 12 of the serial-parallel converter U1 is grounded. In this embodiment, the serial-parallel converter U1 can be an MCP3208.

[0043] like Figure 7As shown, in one embodiment of this application, the driving circuit 230 includes: a driver U2, a twenty-fourth resistor R24, a twenty-fifth resistor R25, a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirtieth resistor R30, a thirty-first resistor R31, and a thirty-second resistor R32; pin 1 of the driver U2 is used to input the power supply voltage; the first terminal of the twenty-fourth resistor R24 ​​is connected to the third terminal of the control circuit 220 through the M-PWMZ00 signal line; the second The second terminal of resistor R24 ​​(fourteenth resistor) and the first terminal of resistor R25 (twenty-fifth resistor) are connected to pin 2 of driver U2; the first terminals of resistors R26 (twenty-sixth resistor), R27 (twenty-seventh resistor), and R28 (twenty-eighth resistor) are connected to pins 3 to 5 of driver U2, respectively; the first terminal of resistor R29 (twenty-ninth resistor) is connected to the fourth sub-terminal of control circuit 220 via the M-PWMZ01 signal line; the second terminal of control circuit 220 includes a third sub-terminal and a fourth sub-terminal; the second terminal of resistor R29 (twenty-ninth resistor) and the first terminal of resistor R30 (thirtieth resistor) are connected to... Pin 6 of driver U2 is connected to the ground; the second terminals of the twenty-ninth resistor R29, the twenty-fifth resistor R25, the twenty-sixth resistor R26, the twenty-seventh resistor R27, the twenty-eighth resistor R28, and the thirtieth resistor R30 are grounded; pin 7 of driver U2 is used to input the power supply voltage; pins 14 and 11 of driver U2 are connected to the first terminal of the thirty-first resistor R31, and the common terminal of the three connections is used to input the power supply voltage; pins 12 and 13 of driver U2 are connected to the second terminal of the thirty-first resistor R31, and the common terminal of the three connections is connected to the first sub-terminal of the current acquisition circuit 240 through the PWMZ00+ signal line; pins 10 and 9 of driver U2 are connected to the first terminal of the thirty-second resistor R32, and the common terminal of the three connections is connected to the second sub-terminal of the current acquisition circuit 240 through the PWMZ01+ signal line. The first terminal of the current acquisition circuit 240 includes a first sub-terminal and a second sub-terminal. Pin 8 of driver U2 is connected to the second terminal of the thirty-second resistor R32, and the common terminal of the two connections is used to input the power supply voltage. In this embodiment, the driver U2 can be a BTS723GW.

[0044] like Figure 4As shown, in one embodiment of this application, the hydraulic pump may include a front hydraulic pump and a rear hydraulic pump. The solenoid valve 300 includes a front pump solenoid valve 310 and a rear pump solenoid valve 320. The excavator's operating actions include stick retraction, stick tilting, boom lifting, boom lowering, bucket digging, bucket tilting, swinging, left travel, and right travel. The pressure sensor 100 includes a stick retraction pilot pressure sensor 101, a stick tilting pilot pressure sensor 102, a boom lifting pilot pressure sensor 103, a boom lowering pilot pressure sensor 104, a bucket digging pilot pressure sensor 105, a bucket tilting pilot pressure sensor 106, a swinging pilot pressure sensor 107, a left travel pilot pressure sensor 108, and a right travel pilot pressure sensor 109 installed on the excavator's operating pilot hydraulic circuit, as well as a front pump pressure sensor installed on the front pump. The force sensor 110 and the rear pump pressure sensor 111 on the rear pump are equipped with 11 gating circuits 210 and 3 serial-to-parallel conversion circuits 250. The current acquisition circuit 240 may include a first current acquisition circuit 241 and a second current acquisition circuit 242. The control circuit 220 is specifically used to output 3 serial gating control signals to the 3 serial-to-parallel conversion circuits 250 according to the received pressure sensor 100 type command. The 3 serial-to-parallel conversion circuits 250 are used to convert the 3 serial gating control signals into 11 parallel gating control signals and output them to each gating circuit 210. Each gating circuit 210 is specifically used to conduct the corresponding path in each gating circuit 210 according to each parallel gating control signal, receive the pressure signals collected by each pressure sensor 100 and output them to the control circuit 220. The control circuit 220 is also specifically used to adjust the positive flow displacement of the front and rear pumps corresponding to each operating action based on the pilot pressure signal and the corresponding positive flow displacement curve of each operating action, using a step size and limit method. The maximum value among the positive flow displacements of the front pump for each operating action is taken as the positive flow displacement of the front pump, and the maximum value among the positive flow displacements of the rear pump for each operating action is taken as the positive flow displacement of the rear pump. Based on the engine idle speed, speed drop, and torque curves, the ideal output power of the front and rear pumps and the engine target speed are calculated. Using the ideal output power of the front and rear pumps, the engine target speed, the front pump pressure signal, and the rear pump pressure signal, the torque displacement of the front pump and the torque displacement of the rear pump are calculated respectively. The minimum value between the positive flow displacement and the front pump torque displacement is taken as the theoretical output displacement of the front pump. The minimum value between the positive flow displacement and the rear pump torque displacement is taken as the theoretical output displacement of the rear pump. The output displacement of the front pump and the output displacement of the rear pump are calculated. Based on the ratio of the drive current of the front pump solenoid valve 310 and the rear pump solenoid valve 320 to the actual displacement of the front pump and the rear pump, the target drive current of the front pump solenoid valve 310 is calculated using the output displacement of the front pump, and the target drive current of the rear pump solenoid valve 320 is calculated using the output displacement of the rear pump. The first front pump drive control signal is output based on the target drive current of the front pump solenoid valve 310, and the first rear pump drive control signal is output based on the target drive current of the rear pump solenoid valve 320. The drive circuit 230 is used to adjust the opening of the front pump solenoid valve 310 according to the first front pump drive control signal, and to adjust the opening of the rear pump solenoid valve 320 according to the first rear pump drive control signal. The first current acquisition circuit 241 is used to acquire the actual drive current output from the drive circuit 230 to the front pump solenoid valve 310 and output the acquired actual drive current; the second current acquisition circuit 242 is used to acquire the actual drive current output from the drive circuit 230 to the rear pump solenoid valve 320 and output the acquired actual drive current. The control circuit 220 is also used to obtain a front pump deviation value based on the actual drive current and the target drive current of the front pump solenoid valve 310. If the front pump deviation value exceeds a preset deviation range, a second front pump drive control signal is output so that the deviation value between the actual drive current and the target drive current of the front pump solenoid valve 310 output by the drive circuit 230 after being controlled by the second front pump drive control signal is within the preset deviation range. The control circuit 220 also obtains a rear pump deviation value based on the actual drive current and the target drive current of the rear pump solenoid valve 320. If the rear pump deviation value exceeds a preset deviation range, a second rear pump drive control signal is output so that the deviation value between the actual drive current and the target drive current of the rear pump solenoid valve 320 output by the drive circuit 230 after being controlled by the second rear pump drive control signal is within the preset deviation range.

[0045] The control circuit 220 can also be used to receive the engine speed signal collected by the engine speed sensor 112, and dynamically adjust the drive current output by the drive circuit 230 according to the engine speed signal to adjust the displacement of the hydraulic front pump and the hydraulic rear pump, so as to avoid engine speed fluctuation or stalling due to sudden load changes.

[0046] like Figure 8 As shown, the first current acquisition circuit 241 includes: a first current acquisition device U3, a thirty-third resistor R33, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5; the common terminal connected to pins 1 and 2 of the first current acquisition device U3 serves as the first sub-terminal of the current acquisition circuit 240 and is connected to pins 12 and 13 of the driver U2 of the drive circuit 230 and the second terminal of the thirty-first resistor R31 via the PWMZ00+ signal line; the common terminal connected to pins 3 and 4 of the first current acquisition device U3 is connected to the front pump solenoid valve 310 via the PWMZ00 signal line; pin 6 of the first current acquisition device U3 is connected to the first terminal of the second capacitor C2; the first current acquisition device U3... Pin 7 is connected to the first end of the 33rd resistor R33. The common terminal connecting the second end of the 33rd resistor R33 and the first end of the third capacitor C3 is connected to the third terminal of the control circuit 220 via the AD-FBI00 signal line. The common terminal connecting pin 8 of the first current collector U3 with the first ends of the fourth capacitor C4 and the fifth capacitor C5 is used to input the first supply voltage (DC5V). Pin 5 of the first current collector U3, the second end of the second capacitor C2, the second end of the third capacitor C3, the second end of the fourth capacitor C4, and the second end of the fifth capacitor C5 are grounded. The specific circuit structure of the second current acquisition circuit 242 is the same as that of the first current acquisition circuit 241, and will not be described again here. In this embodiment, the current collector model can be ACS724.

[0047] like Figure 9As shown, in one embodiment of this application, the first power conversion circuit 271 includes: a first power converter U4, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a fortieth resistor R40, a first inductor L1, a first diode D1, a second diode D2, and a light-emitting diode LED1. The first pin 1 of the first power converter U4 is connected to the first pin of the sixth capacitor C6. The connection is as follows: Pin 2 of the second terminal of the first power converter U4 is connected to the first terminal of the seventh capacitor C7, the first terminal of the eighth capacitor C8, and the first terminal of the thirty-fourth resistor R34. The common terminal of these four connections is used to input the received power supply voltage (e.g., DC 24V). Pin 3 of the first power converter U4 is connected to the second terminal of the thirty-fourth resistor R34 and the first terminal of the thirty-fifth resistor R35. Pin 4 of the first power converter U4 is connected to the first terminal of the thirty-sixth resistor R36. The ground terminal pin 0 of the first power converter U4, the second terminal of the seventh capacitor C7, the second terminal of the eighth capacitor C8, the second terminal of the thirty-fifth resistor R35, and the second terminal of the thirty-sixth resistor R36 are grounded. Pin 5 of power converter U4 is connected to the first terminals of resistors R38 and R39. Pin 6 of power converter U4 is connected to the first terminal of resistor R37 and capacitor C10. The second terminal of resistor R37 is connected to the first terminal of capacitor C9. The second terminal of capacitor C9 and capacitor C10 are connected to and grounded. Pin 7 of power converter U4 is connected to the first terminals of capacitors C11, C12, and C13 and grounded. Pin 8 of power converter U4 is connected to the second terminal of capacitor C6 and capacitor C10. The cathode of diode D1 is connected to the first terminal of the first inductor L1. The anode of the first diode D1 is grounded. The second terminal of the first inductor L1 is connected to the anode of the second diode D2, the second terminal of the eleventh capacitor C11, the second terminal of the twelfth capacitor C12, the second terminal of the thirteenth capacitor C13, the second terminal of the thirty-eighth resistor R38, and the first terminal of the fortieth resistor R40. The cathode of the second diode D2 is used to output the first supply voltage (such as DV). The second terminal of the thirty-ninth resistor R39 is grounded. The second terminal of the fortieth resistor R40 is connected to the anode of the light-emitting diode LED1. The cathode of the light-emitting diode LED1 is grounded. The model of the first power converter U4 can be TPS54560.

[0048] like Figure 10As shown, the second power conversion circuit 272 includes: a second power converter U5, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, and a seventeenth capacitor C17. The input terminal of the second power converter U5 is connected to the first terminal of the fourteenth capacitor C14 and the first terminal of the fifteenth capacitor C15, and the common terminal of the three connected is used to input a first supply voltage (such as DV). The output terminal of the second power converter U5 is connected to the first terminal of the sixteenth capacitor C16 and the first terminal of the seventeenth capacitor C17, and the common terminal of the three connected is used to output a second supply voltage (such as DC3.3V). The ground terminal of the second power converter U5 is connected to and grounded to the second terminal of the fourteenth capacitor C14, the second terminal of the fifteenth capacitor C15, the second terminal of the sixteenth capacitor C16, and the second terminal of the seventeenth capacitor C17. The model of the second power converter U5 can be AMS1117-3.3V.

[0049] like Figure 9 As shown, in one embodiment of this application, the protection circuit 280 includes a second transient diode TVS2, a third transient diode TVS3, and a fuse F1; the filter circuit 290 includes an eighteenth capacitor C18, a nineteenth capacitor C19, a twentieth capacitor C20, a twenty-first capacitor C21, and a second inductor L2; the positive flow controller also includes a third diode D3; the first terminals of the second transient diode TVS2, the third transient diode TVS3, and the fuse F1 are connected, and the common terminal of the three connections is connected to the positive power output terminal of the interface; the second terminal of the fuse F1 is connected to the first terminals of the eighteenth capacitor C18, the nineteenth capacitor C19, and the second inductor L2. The first pin 2 is connected to the second terminal of the second transient diode TVS2, the second terminal of the third transient diode TVS3, the second terminal of the eighteenth capacitor C18, the second terminal of the nineteenth capacitor C19, and the second terminal pin 4 of the second inductor L2. The common terminal of the five connections is connected to the negative power output terminal of the interface 260. The third pin 1 of the second inductor L2 is connected to the first terminal of the twentieth capacitor C20, the first terminal of the twenty-first capacitor C21, and the anode of the third diode D3. The fourth pin 3 of the second inductor L2 is connected to the second terminal of the twentieth capacitor C20 and the second terminal of the twenty-first capacitor C21 and grounded. The cathode of the third diode D3 is connected to the input terminal of the first power conversion circuit 271.

[0050] like Figure 11As shown, in one embodiment of this application, the control circuit 220 includes: a central processing unit U6, a 22nd capacitor C22, a 23rd capacitor C23, a 41st resistor R41, a 42nd resistor R42, a 43rd resistor R43, and a 44th resistor R44. Pin 22 of the central processing unit U6 is connected to the first end of the 41st resistor R41, pin 26 of the central processing unit U6 is connected to the first end of the 42nd resistor R42, the second end of the 41st resistor R41 is connected to the second end of the 42nd resistor R42, and the common terminal of the connection is grounded. Pin 32 of CPU U6 is used for inputting the reference voltage. Pin 71 of CPU U6 is connected to the first terminal of the 22nd capacitor C22, and the second terminal of the 22nd capacitor C22 is grounded. Pin 106 of CPU U6 is connected to the first terminal of the 23rd capacitor C23. Pin 107 of CPU U6 is connected to the second terminal of the 23rd capacitor C23, and the common terminal of the connection is grounded. Pin 138 of CPU U6 is connected to the first terminal of the 43rd resistor R43, and the second terminal of the 43rd resistor R43 is grounded. Pin 143 of CPU U6 is connected to the 44th resistor R43. The first end of resistor R44 is connected, and the second end of resistor R44 is used to input the second supply voltage (e.g., 3.3V). Pins 16, 31, 38, 51, 61, 83, 94, 120, and 130 of the central processing unit U6 are grounded. The second end of the twentieth resistor R20 in the serial-to-parallel conversion circuit 250 is connected to pin 117 of the central processing unit U6 through the SCL signal line. The second end of the twenty-first resistor in the serial-to-parallel conversion circuit 250 is connected to pin 116 of the central processing unit U6 through the SDA signal line. The first... The first end of the 24-resistor R24 ​​is connected to pin 139 of the central processing unit U6 via the M-PWMZ00 signal line. The first end of the 29th resistor R29 in the drive circuit 230 is connected to pin 140 of the central processing unit U6 via the M-PWMZ01 signal line. The common terminal connecting the second end of the 33rd resistor R33 in the first current acquisition circuit 241 and the first end of the third capacitor C3 is connected to pin 35 of the central processing unit U6 via the AD-FBI00 signal line. The central processing unit U6 can be a CKS32F407ZGT6 chip.

[0051] The embodiments in this specification are described in a progressive manner, with each embodiment focusing on the aspects related to... For any differences between the embodiments, or for the same or similar parts between the embodiments, please refer to each other.

[0052] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not 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

1. A positive flow controller, characterized in that, include: Gating circuit, control circuit, and drive circuit; The first terminal of the gating circuit is connected to the output terminal of the pressure sensor. The second terminal of the gating circuit is connected to the first terminal of the control circuit; The second terminal of the control circuit is connected to the first terminal of the drive circuit; The second end of the drive circuit is connected to the solenoid valve of the hydraulic pump. The control circuit is used to output a gating control signal according to the received pressure sensor type instruction; The gating circuit is used to turn on the corresponding path in the gating circuit according to the gating control signal, receive the pressure signal collected by the pressure sensor and output it. The control circuit is further configured to obtain a target driving current based on the pressure signal, and output a first driving control signal based on the target driving current. The drive circuit is used to adjust the opening degree of the solenoid valve according to the first drive control signal.

2. The positive flow controller according to claim 1, characterized in that, It also includes: current acquisition circuit; The second terminal of the driving circuit is connected to the first terminal of the current acquisition circuit. The second terminal of the current acquisition circuit is connected to the solenoid valve; The third terminal of the current acquisition circuit is connected to the third terminal of the control circuit; The current acquisition circuit is used to acquire the actual driving current output from the drive circuit to the solenoid valve, and output the acquired actual driving current. The control circuit is further configured to obtain a deviation value based on the actual drive current and the target drive current, and if the deviation value exceeds a preset deviation range, output a second drive control signal so that the deviation value between the actual drive current and the target drive current output by the drive circuit after being controlled by the second drive control signal is within the preset deviation range.

3. The positive flow controller according to claim 2, characterized in that, There are multiple pressure sensors and gating circuits, and the controller further includes a serial-to-parallel conversion circuit. The first terminal of each of the aforementioned gating circuits is connected to each of the aforementioned pressure sensors in a one-to-one correspondence. The second terminals of the plurality of gating circuits are connected to the first terminal of the control circuit; The third terminals of the plurality of gating circuits are connected to the first terminal of the serial-to-parallel conversion circuit; The second terminal of the serial-to-parallel conversion circuit is connected to the fourth terminal of the control circuit; The control circuit is specifically used to output a serial gating control signal according to the received pressure sensor type instruction; The serial-to-parallel conversion circuit is used to convert the serial gating control signal into multiple parallel gating control signals and output them to each of the gating circuits. Each of the aforementioned gating circuits is specifically used to turn on the corresponding path in each of the aforementioned parallel gating control signals, receive the pressure signals collected by each of the aforementioned pressure sensors, and output them to the control circuit.

4. The positive flow controller according to claim 3, characterized in that, Also includes: Interface and power conversion circuitry; The power output terminal of the interface is connected to the power input terminal of the drive circuit and the input terminal of the power conversion circuit. The output terminal of the power conversion circuit is connected to the power input terminals of each of the gating circuits, the control circuit, the current acquisition circuit, and the conversion circuit. The interface is used to receive the input power supply voltage and output the received power supply voltage to the drive circuit and the power conversion circuit. The power conversion circuit is used to receive the power supply voltage and convert the power supply voltage into a supply voltage for output.

5. The positive flow controller according to claim 4, characterized in that, The power conversion circuit includes: a first power conversion circuit and a second power conversion circuit; The input terminal of the first power conversion circuit is connected to the power output terminal of the interface; The output terminal of the first power conversion circuit is connected to the power input terminal of the current acquisition circuit and the input terminal of the second power conversion circuit. The output terminal of the second power conversion circuit is connected to the power input terminals of each of the gating circuits, the control circuit, and the conversion circuit. The first power conversion circuit is used to receive the power supply voltage and convert the power supply voltage into a first supply voltage for output. The second power conversion circuit is used to receive the first power supply voltage and convert the first power supply voltage into a second power supply voltage for output, wherein the power supply voltage includes the first power supply voltage and the second power supply voltage.

6. The positive flow controller according to claim 5, characterized in that, Also includes: Protection circuit; The input terminal of the protection circuit is connected to the power output terminal of the interface; The output terminal of the protection circuit is connected to the input terminal of the first power conversion circuit; The protection circuit is used to suppress transient voltages of the power input from the interface and output the power voltage after transient voltage suppression. When the input current value reaches or exceeds the rated value, the path between the interface and the first power conversion circuit is disconnected.

7. The positive flow controller according to claim 6, characterized in that, Also includes: Filtering circuit; The input terminal of the filter circuit is connected to the output terminal of the protection circuit; The output terminal of the filter circuit is connected to the input terminal of the first power conversion circuit; The filtering circuit is used to filter the power supply voltage after the transient voltage is suppressed, and output the filtered power supply voltage.

8. The positive flow controller according to claim 3, characterized in that, The selection circuit includes: a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, a first transient diode, a first Zener diode, a second Zener diode, a first capacitor, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, and a fourteenth resistor; The first end of the first resistor, the first end of the first transient diode, the first end of the sixth resistor, and the first end of the eighth resistor are connected to the output end of the pressure sensor. The second end of the first resistor is connected to the first end of the first switching transistor; The second terminal of the first switching transistor is connected to the first terminal of the second resistor, and the common terminal of the connection is used to input the second supply voltage; The third terminal of the first switching transistor is connected to the second terminal of the second resistor and the first terminal of the third resistor; The second end of the third resistor is connected to the first end of the second switching transistor; The second terminal of the second switch is connected to the first terminal of the fourth resistor, and the common terminal of the connection is grounded. The third terminal of the second switch is connected to the second terminal of the fourth resistor and the first terminal of the fifth resistor; The second terminal of the fifth resistor is connected to the first sub-terminal of the serial-to-parallel conversion circuit; The second end of the eighth resistor is connected to the first end of the third switch transistor; The second terminal of the third switch is connected to the first terminal of the ninth resistor, and the common terminal of the connection is grounded. The third terminal of the third switch is connected to the second terminal of the ninth resistor and the first terminal of the tenth resistor. The second terminal of the tenth resistor is connected to the second sub-terminal of the serial-to-parallel conversion circuit; The second end of the sixth resistor is connected to the first end of the eleventh resistor and the first end of the seventh resistor; The second end of the eleventh resistor is connected to the first end of the fourth switch transistor; The second terminal of the fourth switch is connected to the first terminal of the twelfth resistor, and the common terminal of the connection is grounded. The third terminal of the fourth switch is connected to the second terminal of the twelfth resistor and the first terminal of the thirteenth resistor; The second terminal of the thirteenth resistor is connected to the third terminal of the series-parallel conversion circuit; The second end of the seventh resistor is connected to the anode of the first Zener diode, the cathode of the second Zener diode, the first end of the first capacitor, and the first end of the fourteenth resistor, and the common end of the five connections is connected to the first end of the control circuit. The cathode of the first Zener diode is used to input the second power supply voltage; The anode of the second Zener diode is connected to the second terminal of the first capacitor and the second terminal of the fourteenth resistor, and the common terminal of the three connections is grounded. The first terminal of the serial-to-parallel conversion circuit includes a first sub-terminal to a third sub-terminal.

9. The positive flow controller according to claim 8, characterized in that, The selection circuit further includes: a fifth switch, a sixth switch, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, and a nineteenth resistor, wherein the resistance values ​​of the first resistor and the fifteenth resistor are different; The first end of the fifteenth resistor is connected to the output end of the pressure sensor; The second end of the fifteenth resistor is connected to the first end of the fifth switching transistor; The second terminal of the fifth switch is connected to the first terminal of the sixteenth resistor, and the common terminal of the connection is used to input the second power supply voltage. The third terminal of the fifth switch is connected to the second terminal of the sixteenth resistor and the first terminal of the seventeenth resistor; The second end of the seventeenth resistor is connected to the first end of the sixth switch transistor; The second terminal of the sixth switch is connected to the first terminal of the eighteenth resistor, and the common terminal of the connection is grounded. The third terminal of the sixth switch is connected to the second terminal of the eighteenth resistor and the first terminal of the nineteenth resistor; The second terminal of the nineteenth resistor is connected to the fourth sub-terminal of the series-parallel conversion circuit; The first terminal of the serial-to-parallel conversion circuit also includes a fourth sub-terminal.

10. The positive flow controller according to claim 9, characterized in that, The serial-to-parallel conversion circuit includes: a serial-to-parallel converter, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, and a twenty-third resistor; The first to fourth terminals of the serial-to-parallel converter serve as the first to fourth sub-terminals of the serial-to-parallel conversion circuit. The fifth terminal of the serial-to-parallel converter is connected to the first terminal of the twentieth resistor; The second end of the twentieth resistor is connected to the first sub-terminal of the control circuit; The sixth terminal of the serial-to-parallel converter is connected to the first terminal of the twenty-first resistor; The second terminal of the 21 resistor is connected to the second sub-terminal of the control circuit, wherein the fourth terminal of the control circuit includes the first sub-terminal and the second sub-terminal. The seventh terminal of the serial-to-parallel converter is connected to the first terminal of the twenty-second resistor; The second end of the 22nd resistor is connected to the eighth end of the serial-to-parallel converter, and the common end of the connection is used to input the second supply voltage; The ninth terminal of the serial-to-parallel converter is connected to the first terminal of the twenty-third resistor; The second terminal of the 23rd resistor is used to input the second supply voltage; The tenth and eleventh terminals of the serial-to-parallel converter are connected, and the common terminal of the connection is grounded. The twelfth terminal of the serial-to-parallel converter is grounded.

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