CN105782556B

CN105782556B - A kind of control method of Hydraulic high-speed on-off valve door detection and control circuit

Info

Publication number: CN105782556B
Application number: CN201610266504.7A
Authority: CN
Inventors: 夏素梅; 邹洪波; 张青; 柏建军
Original assignee: Hangzhou Dianzi University
Current assignee: Hangzhou Dianzi University
Priority date: 2016-04-26
Filing date: 2016-04-26
Publication date: 2019-02-01
Anticipated expiration: 2036-04-26
Also published as: CN105782556A

Abstract

The invention discloses a kind of measurement of hydraulic selector valve and the control method of control circuit, which includes RAM plate basic circuit part, displacement signal detection circuit part and control signal output circuit part.The circuit of the detection of Hydraulic high-speed on-off valve door and control device of the invention is through practice examining, and the effectively measuring corresponding voltage value of valve displacement out of energy, to be converted into corresponding control valve signal, error is in negligible range.The detection of hydraulic valve switch and control device, can be used in hydraulic valve control system, and circuit design is simple, and cost performance height is, it can be achieved that real time communication, practical value are obvious.

Description

A kind of control method of Hydraulic high-speed on-off valve door detection and control circuit

Technical field

The invention belongs to technical field of industrial control, are related to a kind of circuit, and in particular to a kind of Hydraulic high-speed on-off valve door The circuit of detection and control device.

Background technique

Hydraulic valve controller currently used in the market has that bulky, control precision is lower.With society The continuous improvement of meeting being constantly progressive with economic level, it is new that the working method of conventional hydraulic valve has been unable to satisfy industrial circle day Month different variation, so hydraulic valve how to be made to obtain intelligentized control method and can automatically adjust to become current most important problem. We will complete the unlatching and closure of valve to Hydraulic high-speed on-off valve door by the way of digital valve, with differential pressure pick-up Etc. equipment make hydraulic valve that digitlization, intelligence and integrated be better achieved.

Summary of the invention

The purpose of the present invention is to hydraulic valve electric currents to be precisely controlled the imperfect of technology, provides a kind of reliable , the circuit of stable Hydraulic high-speed on-off valve door detection and control device.

In order to achieve the above object, the technical solution adopted by the present invention are as follows:

A kind of measurement and control circuit of hydraulic selector valve, including RAM plate basic circuit part, displacement signal detection electricity Road part and control signal output circuit part.

RAM plate basic circuit part includes CPU, voltage filter modular circuit, voltage transformation module circuit, serial ports downloading journey Sequence modular circuit, clock module circuit, starting module circuit and external power supply download interface circuit；The CPU is used STM32F407VGT6 chip；

The voltage filter module includes that digital voltage VCC filtering and analog voltage AVCC filter two parts.Digital voltage VCC filtering part includes four capacitors.Wherein one end of the first filter capacitor CV17, one end of the second filter capacitor CV18, One end of three filter capacitor CV19, one end of the 4th filter capacitor CV20 are all connect with the end power supply VCC, four filter capacitors it is another Outer one end is all grounded.

The analog voltage AVCC filtering includes two capacitors.Wherein one end of the 5th filter capacitor CA7, the 6th filtered electrical The one end for holding CA8 all connect with one end of analog power AVCC and connects 22 feet of CPU, and the other end of two filter capacitors all connects Simulation ground AGND.

The voltage transformation module includes a capacitor.Wherein 49 feet of one end of the 7th filter capacitor CCAP2 and CPU connect It connects, the other end ground connection of the 7th filter capacitor CCAP2.

The serial ports downloading program module includes two resistance and a capacitor.One end of first divider resistance RB3 and the One end of two divider resistance RB4 connects, and the other end of the first divider resistance RB3 and the pin 94 of CPU connect.First storage capacitor One end of CRES1 is connected with the NRST interface of CPU, the other end connect and ground of the other end and the second divider resistance RB4.

The clock module includes a crystal oscillator and two capacitors；One end of first crystal oscillator Y1 and the second storage capacitor CY1 One end connection, and connect with the pin of CPU 12；The other end of first crystal oscillator Y1 is connect with one end of third storage capacitor CY2, And it is connect with the pin of CPU 13.The other end of second storage capacitor CY1, the other end of third storage capacitor CY2 are all grounded.

The starting module includes a resistance.One end of first pull down resistor RB1 and the pin 37 of CPU connect, another End ground connection.

91 feet of the CPU are connect with one end of third divider resistance RCAN1, the other end of third divider resistance RCAN1 It is connect with 4 feet of CAN interface integrated chip U5；52 feet of CPU are connect with one end of the 4th divider resistance RCAN3, the 4th partial pressure The other end of resistance RCAN3 is connect with 1 foot of the CAN interface integrated chip U5.74 feet, 99 feet, 27 feet, 10 feet of CPU Ground connection, 50 feet, 75 feet, 100 feet, 28 feet, 11 feet meet power supply VCC, and 20 feet ground connection simulation ground AGND, 21 feet, 22 feet connect simulation electricity Source AVCC；73 feet of CPU are connect with one end of the first decoupling capacitor CCAP1, the other end ground connection of the first decoupling capacitor CCAP1； 19 feet of CPU connect another termination power VCC of the first pull-up resistor RA1, the first pull-up resistor RA1；The 29 feet connection the of CPU The other end of one end of five divider resistance RS6, the 5th divider resistance RS6 connects one end of the 8th filter capacitor CS5, and connects The positive input of the part LVDT the first operational amplifier U3A, the other end connection simulation of the 8th filter capacitor CS5 AGND；40 feet of CPU connect one end of the 6th divider resistance RT1, and the other end of the 6th divider resistance RT1 connects the left PWM control The other end of first current-limiting resistance R11, the tenth current-limiting resistance R41 in the H-bridge circuit module of system；42 feet of CPU connect the 7th point One end of piezoresistance RT3, the other end of the 7th divider resistance RT3 connect the 7th limit in the H-bridge circuit module of the left PWM control The other end of leakage resistance R31, the 5th current-limiting resistance R21；63 feet of CPU connect one end of the 8th divider resistance RT2, the 8th partial pressure The other end of resistance RT2 connects the 11st current-limiting resistance R51, the 20th current limliting electricity in the H-bridge circuit module of the right PWM control Hinder the other end of R81；64 feet of CPU connect one end of the 9th divider resistance RT4, the other end connection of the 9th divider resistance RT4 The other end of 17th current-limiting resistance R71, the 15th current-limiting resistance R61 in the H-bridge circuit module of the right PWM control.CPU exists Pin not mentioned herein is all aerial；

In addition there are external power supply interface P0, pin 1 meets power supply VCC, and pin 2 connects the pin 72 of CPU, and pin 3 connects CPU's Pin 76, pin 4 are grounded.

The CAN transceiver module includes a resistance and CAN interface integrated chip U5；The type of CAN interface integrated chip U5 Number be SN65HVD232DR；One end of tenth divider resistance RCAN4 is connect with 7 feet of CAN interface integrated chip U5, the other end with 6 feet of CAN interface integrated chip U5 connect.2 feet of CAN interface integrated chip U5 are grounded；3 feet of CAN interface integrated chip U5 It is connect with the end power supply VCC.

Power supply includes being depressured main filter module, control signal detection module, input power detection module, voltage Filter module and ground connection isolation module.

The main filter circuit module of decompression includes a low-dropout regulator, 26 capacitors and two ferrite magnetics Pearl；The model CAT6219-330TDGT3 of low-dropout regulator U4；The model HTY100505T-221Y- of ferrite bean N；One end of 9th filter capacitor CP7, one end of the tenth filter capacitor CP8 connect with+5V power supply and connect the first low voltage difference pressure stabilizing 1 foot of device U4, the other end of two filter capacitors are all grounded GND.One end of 11st filter capacitor CP14, the 12nd filtered electrical The one end for holding CP15 is connected with 4 feet of the first low-dropout regulator U4, and the other end of two filter capacitors is all grounded.13rd filter One end of wave capacitor CV1, the 14th filter capacitor CV2 one end, one end of the 15th filter capacitor CV3, the 16th filtered electrical Hold one end of CV4, one end of the 17th filter capacitor CV5, one end of the 18th filter capacitor CV6, the 19th filter capacitor CV7 One end, the 20th filter capacitor CV8 one end connected with one end of the first ferrite bean FB3, and connect the first low voltage difference 5 feet of voltage-stablizer U4, the other end ground connection of eight filter capacitors.The other end of first ferrite bean FB3 and the 21st filter One end of wave capacitor CV9, one end of the 22nd filter capacitor CV10, one end of the 23rd filter capacitor CV11, the 20th One end of four filter capacitor CV12, one end of the 25th filter capacitor CV13, one end of the 26th filter capacitor CV14, One end of 27 filter capacitor CV15, one end of the 28th filter capacitor CV16 all connect, and are connected to power supply VCC, and eight The other end of a filter capacitor is all grounded.One end of 29th filter capacitor CA1, one end of the 30th filter capacitor CA2, One end of 31 filter capacitor CA3 is connected with one end of the second ferrite bean FB4, and connects the first low-dropout regulator U4 5 feet, the other end ground connection simulation ground AGND of three filter capacitors.The other end and the 32nd of second ferrite bean FB4 One end of filter capacitor CA4, one end of the 33rd filter capacitor CA5, the 34th filter capacitor CA6 one end all connect, And it is connected to analog power AVCC, the other end of three filter capacitors is all grounded simulation ground AGND.

The control signal detecting part is divided to socket, two resistance and a capacitor including 6 ports.The 1 of socket P1 Port connects voltage VIN；2 ports of socket P1,6 ports all earth shield ground EGND；5 ports, 4 ports of socket P1 successively connect Connect 7 feet, 6 feet of CAN interface integrated chip U5；3 ports of socket P1 connect one end connection of the 11st divider resistance RC1, One end of the other end of 11st divider resistance RC1 and the 12nd divider resistance RC2, the 35th filter capacitor CC1 one end Connection, and it is connected to 26 feet of CPU；The other end of 12nd divider resistance RC2 and the other end of the 35th filter capacitor CC1 All it is grounded.

The voltage VIN filter circuit includes 6 capacitors.One end of 36th filter capacitor CP1, the 37th filtering One end of capacitor CP2, one end of the 38th filter capacitor CP3, one end of the 39th filter capacitor CP4, the 40th filtering One end of capacitor CP5, the 41st filter capacitor CP6 one end be all connected to power supply VIN, the other end of six filter capacitors is all Earth shield ground EGND.

The input power VIN detection circuit includes 2 resistance and a capacitor.One end of 13rd divider resistance RN1 Meet power supply VIN, one end connection of one end, the 42nd filter capacitor CN1 of the other end and the 14th divider resistance RN2, and even It is connected to 25 feet of CPU.The other end of 14th divider resistance RN2, the other end of the 42nd filter capacitor CN1 are all grounded.

The ground connection isolation module includes two ferrite beans, the model HTY100505T-221Y- of ferrite bean N；A termination simulation ground AGND of third ferrite bean FB5, other end ground connection；4th ferrite bean FB6 mono- termination shielding Ground EGND, other end ground connection.

Institute's displacement detection circuit includes five resistance, four capacitors, two operational amplifiers, two pole of Schottky Pipe.The model LMC6482AIMX/NOPB of first operational amplifier and second operational amplifier；The model of Schottky diode For NSR0140P2T5G；One end of the inverting input terminal of first operational amplifier U3A and the 43rd filter capacitor CS2, the tenth One end of five divider resistance RS2 is connected, and normal phase input end is connected with one end of the second pull down resistor RS7, output end and the 40th The other end of three filter capacitor CS2, the other end of the 15th divider resistance RS2, one end of the 16th divider resistance RS1 connect, And it is connected to 23 feet of CPU.One end of the inverting input terminal of second operational amplifier U3B and the 17th divider resistance RS5, third One end connection of one end of pull down resistor RS3, the 44th filter capacitor CS3, normal phase input end and the 18th divider resistance RS4 One end, one end of the 45th filter capacitor CS4, the first Schottky diode DS1 cathode connection, output end and the 17th The other end of divider resistance RS5 connects, and is connected to 24 feet of CPU.The other end, the third drop-down electricity of second pull down resistor RS7 Hinder the other end of RS3, the other end of the 44th filter capacitor CS3, the other end of the 45th filter capacitor CS4, first Xiao The anode of special based diode DS1 all ground connection simulation ground AGND.1 foot of connector Ps and one end of the 46th filter capacitor CS1 Connection, the other end of the 46th filter capacitor CS1 and the other end of the 16th divider resistance RS1 connect；3 feet of connector Ps It is connected with the other end of the 18th divider resistance RS4；2 feet of connector Ps meet simulation ground AGND.

Signal generating circuit includes switching power circuit and filter circuit.

The switching power circuit module includes a suitching type voltage-releasing voltage stabilizer, two resistance and a capacitor；It is described Suitching type voltage-releasing voltage stabilizer model U1AOZ1280CI；1 pin, 6 pins and of first suitching type voltage-releasing voltage stabilizer U1 The both ends of one feedback capacity C5 connect, 2 pins ground connection, one end, the 20th divider resistance of 3 pins and the 19th divider resistance R1 One end of R2 connects, and 4 pins are connect with 5 pins, power supply VIN.The other end of 19th divider resistance R1 is connect with+5V power supply, The other end of 20th divider resistance R2 is grounded.

The filter circuit module includes 14 capacitors, two ferrite beans, an inductance and a Schottky two Pole pipe；The model MBRA160T3G of the Schottky diode；The model HFY100505T-221Y- of ferrite bean N；The 6 pins company of the cathode of one end of first filter inductance L1 and the second Schottky diode DP1, the first voltage-releasing voltage stabilizer U1 It connects.One end of the other end of first filter inductance L1 and the 47th filter capacitor C6, the 48th filter capacitor C7 one end, One end of 49th filter capacitor C8, one end of the 50th filter capacitor C9, one end of the 51st filter capacitor C10, One end connection of one end, the 5th ferrite bean FB1 of 52 filter capacitor C11.The other end of 5th ferrite bean FB1 With one end of the 53rd filter capacitor C12, one end of the 54th filter capacitor C13, the 55th filter capacitor C14 one One end connection at end, one end of the 56th filter capacitor C15, the 6th ferrite bean FB2.6th ferrite bean FB2's One end of the other end and the 57th filter capacitor C16, one end of the 58th filter capacitor C17, the 59th filter capacitor One end of C18, the 60th filter capacitor C19 one end connect and connect+5V out-put supply.The other end of 14 filter capacitors It is all grounded with the anode of the second Schottky diode DP1.

The H-bridge circuit of PWM control includes the H-bridge circuit of left PWM control and its H-bridge circuit of filter circuit, right PWM control And its filter circuit.

The filter circuit of the H-bridge circuit of the left PWM control includes four capacitors.Wherein the 61st filter capacitor CP10 One end, the 62nd filter capacitor CP11 one end, one end of the 63rd filter capacitor CP12, the 64th filter capacitor One end of CP13 is all connect with the end power supply VIN, and the other end of four filter capacitors all connects shielding ground.

The H-bridge circuit module of the left PWM control includes the connector of 2 ports, two binary channels field-effect tube, and four A general triode, four zener diodes, 16 resistance (ten current-limiting resistances, four discharge resistances, two load electricity Resistance)；The model BSO615CG of the binary channels field-effect tube；The model BC847BPDW1T1G of general triode；First 1 pin of general triode T1 is grounded, and 2 pins are connect with one end of the first current-limiting resistance R11,6 pins and the second current-limiting resistance One end of R12 connects, remaining pin that do not mention herein is all aerial.The pin 4 and power supply VIN of second general triode T2 Connection, pin 5 and pin 6 are connect with the both ends of third current-limiting resistance R23, and one end of pin 3 and the 4th current-limiting resistance R22 connect It connects, pin 2 is connect with one end of the 5th current-limiting resistance R21, and pin 1 is grounded.The pin 6 of the general triode T3 of third and the 6th limit One end of leakage resistance R32 connects, and pin 2 is connect with one end of the 7th current-limiting resistance R31, and pin 1 is grounded.4th general triode The pin 4 of T4 is connect with input power VIN, and pin 5 and pin 6 are connect with the both ends of the 8th current-limiting resistance R43, pin 3 and One end of nine current-limiting resistance R42 connects, and pin 2 is connect with one end of the tenth current-limiting resistance R41, and pin 1 is grounded；

One end of the pin 4 of first binary channels field-effect tube Q1 and the first discharge resistance RD1, the first zener diode D1 One end connection of one end, the second current-limiting resistance R12, one end, the second zener diode D2 of pin 2 and the second discharge resistance RD2 One end, one end of the 4th current-limiting resistance R22, the first detection resistance RL2 one end connection, pin 5, pin 6, pin 7, pin 8 connect with 1 port of connector PVL.The pin 4 of second bilateral field-effect tube Q2 and one end, the third of third discharge resistance RD3 The other end of one end connection of one end of zener diode D3, the 6th current-limiting resistance R32, pin 2 and the 4th discharge resistance RD4, One end connection of the other end, the 9th current-limiting resistance R42 of 4th zener diode D4, pin 5, pin 6, pin 7,8 and of pin 2 ports of connector PVL connect.The other end of first zener diode D1, the other end of the first discharge resistance RD1, first pair The pin 3 of channel field-effect tube Q1, the pin 3 of the second binary channels field-effect tube Q2, the other end of third discharge resistance RD3, Another termination power VIN of three zener diode D3, the other end of the second zener diode D2, the second discharge resistance RD2 it is another One end, the pin 1 of the first binary channels field-effect tube Q1, the second binary channels field-effect tube Q2 pin 1, the 4th discharge resistance RD4 The other end, the other end of the second zener diode D4, one end of first resistor RL2 and the second detection resistance RL1 one end connect It connects, another termination of the other end of the second detection resistance RL1 and the first detection resistance RL2 shield ground.

The filter circuit of the H-bridge circuit of the right PWM control includes four capacitors.Wherein the 65th filter capacitor CP20 One end, the 66th filter capacitor CP21 one end, one end of the 67th filter capacitor CP22, the 68th filter capacitor One end of CP23 is all connect with the end power supply VIN, and the other end of four filter capacitors all connects shielding ground.

The H-bridge circuit module of the right PWM control includes two binary channels field-effect tube, four general triodes, and four Zener diode, 16 resistance (ten current-limiting resistances, four discharge resistances, two load resistances)；The bilateral place where Taoist rites are performed The model BSO615CG of effect pipe；The model BC847BPDW1T1G of general triode；1 pipe of 5th general triode T5 Foot ground connection, 2 pins are connect with one end of the 11st current-limiting resistance R51, and 6 pins are connect with one end of the 12nd current-limiting resistance R52, Remaining pin that do not mention herein is all aerial.The pin 4 of 6th general triode T6 is connect with power supply VIN, pin 5 and pipe Foot 6 is connect with the both ends of the 13rd current-limiting resistance R63, and pin 3 is connect with one end of the 14th current-limiting resistance R62, pin 2 and One end of 15 current-limiting resistance R61 connects, and pin 1 is grounded.The pin 6 and the 16th current-limiting resistance of 7th general triode T7 One end of R72 connects, and pin 2 is connect with one end of the 17th current-limiting resistance R71, and pin 1 is grounded.8th general triode T8's Pin 4 is connect with input power VIN, and pin 5 and pin 6 are connect with the both ends of the 18th current-limiting resistance R83, pin 3 and the tenth One end of nine current-limiting resistance R82 connects, and pin 2 is connect with one end of the 20th current-limiting resistance R81, and pin 1 is grounded；

One end of the pin 4 of third binary channels field-effect tube Q5 and the 5th discharge resistance RD5, the 5th zener diode D5 One end connection of one end, the 12nd current-limiting resistance R52, one end, the 6th zener diode of pin 2 and the 6th discharge resistance RD6 One end of D6, the 14th current-limiting resistance R62 connection, pin 5, pin 6, pin 7, pin 8 are connected with 1 port of connector PVL. One end of the pin 4 of 4th bilateral field-effect tube Q6 and the 7th discharge resistance RD7, one end of the 7th zener diode D7, the tenth One end of six current-limiting resistance R72 connects, the other end of pin 2 and the 8th discharge resistance RD8, the 8th zener diode D8 it is another One end connection at end, the 16th current-limiting resistance R72, pin 5, pin 6, pin 7, pin 8 are connected with 2 ports of connector PVL. The other end of 5th zener diode D5, the other end of the 5th discharge resistance RD5, third binary channels field-effect tube Q5 pin 3, The pin 3 of 4th binary channels field-effect tube Q6, the other end of the 7th discharge resistance RD7, the 7th zener diode D7 the other end Connect power supply VIN, the other end of the 6th zener diode D6, the other end of the 6th discharge resistance RD6, third binary channels field-effect tube The pin 1 of Q5, the pin 1 of the 4th binary channels field-effect tube Q6, the 8th discharge resistance RD8 the other end, the 8th zener diode The other end of D8, one end of third detection resistance RL5 are connected with one end of the 4th resistance RL6, and third detection resistance RL5's is another Another termination of end and the 4th detection resistance RL6 shield ground.

Detecting signal filter circuit includes left-side signal filter circuit and right-side signal filter circuit.

The left-side signal filter circuit includes two resistance, four capacitors.One end of 21st divider resistance RL3 with One end of 22nd divider resistance RL4, one end of the 69th filter capacitor CL1, the 70th filter capacitor CL2 one end connect It connects, the other end of the 22nd divider resistance RL4 and one end, the 72nd filter capacitor CL4 of the 71st filter capacitor CL3 One end connect and connect the ADC123_10 interface of CPU.The other end, the 70th filter capacitor of 69th filter capacitor CL1 The other end of CL2, the other end of the 71st filter capacitor CL3, the 72nd filter capacitor CL4 the other end be all grounded；

The right-side signal filter circuit includes two resistance, four capacitors.One end of 23rd divider resistance RL7 with One end of 73rd filter capacitor CL5, one end of the 74th filter capacitor CL6, the 24th divider resistance RL8 one end Connection, the other end of the 24th divider resistance RL8 and one end, the 76th filter capacitor of the 75th filter capacitor CL7 One end of CL8 connects and connects the ADC123_11 interface of CPU.The other end of 73rd filter capacitor CL5, the 74th filtering The other end of capacitor CL6, the other end of the 75th filter capacitor CL7, the 76th filter capacitor CL8 the other end all connect Ground.

The utility model has the advantages that

The circuit of the detection of Hydraulic high-speed on-off valve door and control device, can effectively measuring valve displacement out through practice examining Corresponding voltage value, to be converted into corresponding control valve signal, error is in negligible range.Hydraulic valve switch Detection and control device, can be used in hydraulic valve control system, and circuit design is simple, and cost performance is high, it can be achieved that in real time Communication, practical value are obvious.

Detailed description of the invention

Fig. 1 is CPU, voltage filter modular circuit, voltage transformation module electricity in RAM plate basic circuit part of the invention Road, serial ports downloading program module circuit, clock module circuit, starting module circuit and external power supply download interface circuit；

Fig. 2 is the CAN transceiver module circuit part in the RAM plate basic circuit part of invention；

Fig. 3-1 is the main filter module of decompression in power supply；

Fig. 3-2 is the control signal detection module in power supply；

Fig. 3-3 is the input power detection module in power supply；

Fig. 3-4 is the voltage filter module in power supply；

Fig. 3-5 is the ground connection isolation module in power supply；

Fig. 4 is displacement detecting circuit；

Fig. 5 is that signal generating circuit includes switching power circuit and filter circuit；

Fig. 6 is the H-bridge circuit and corresponding filter circuit that left PWM is controlled；

Fig. 7 is the H-bridge circuit and corresponding filter circuit that right PWM is controlled；

Fig. 8 is filter circuit.

Specific embodiment

Below with reference to schematic diagram and concrete operations implementation, the invention will be further described, to help the scientific research of related fields Worker has a more deep understanding to thought of the invention.

A kind of measurement and control circuit of hydraulic threshold switch, including RAM plate basic circuit part, displacement signal detection circuit Output circuit part is controlled with signal.

As shown in Figure 1, RAM plate basic circuit part include CPU, voltage filter modular circuit, voltage transformation module circuit, Serial ports downloads program module circuit, clock module circuit, starting module circuit and external power supply download interface circuit；Described CPU uses STM32F407VGT6 chip；

As shown in Fig. 2, the CAN transceiver module includes a resistance and CAN interface integrated chip U5；CAN interface is integrated The model SN65HVD232DR of chip U5；One end of tenth divider resistance RCAN4 and 7 feet of CAN interface integrated chip U5 connect It connects, the other end is connect with 6 feet of CAN interface integrated chip U5.2 feet of CAN interface integrated chip U5 are grounded；CAN interface is integrated 3 feet of chip U5 are connect with the end power supply VCC.

As shown in figure 3-1, the main filter circuit module of the decompression includes a low-dropout regulator, 26 capacitors and Two ferrite beans；The model CAT6219-330TDGT3 of low-dropout regulator U4；The model of ferrite bean HTY100505T-221Y-N；One end of 9th filter capacitor CP7, one end of the tenth filter capacitor CP8 are connect simultaneously with+5V power supply 1 foot of the first low-dropout regulator U4 is connect, the other end of two filter capacitors is all grounded GND.11st filter capacitor CP14's One end, the 12nd filter capacitor CP15 one end connected with 4 feet of the first low-dropout regulator U4, two filter capacitors it is another End is all grounded.One end of 13rd filter capacitor CV1, one end of the 14th filter capacitor CV2, the 15th filter capacitor CV3 One end, one end of the 16th filter capacitor CV4, one end of the 17th filter capacitor CV5, the 18th filter capacitor CV6 one end, One end of 19th filter capacitor CV7, one end of the 20th filter capacitor CV8 are connected with one end of the first ferrite bean FB3, And 5 feet of the first low-dropout regulator U4 are connected, the other end ground connection of eight filter capacitors.First ferrite bean FB3's is another One end and one end of the 21st filter capacitor CV9, one end of the 22nd filter capacitor CV10, the 23rd filter capacitor One end of CV11, one end of the 24th filter capacitor CV12, one end of the 25th filter capacitor CV13, the 26th filtering One end of capacitor CV14, one end of the 27th filter capacitor CV15, the 28th filter capacitor CV16 one end all connect, and It is connected to power supply VCC, the other end of eight filter capacitors is all grounded.One end of 29th filter capacitor CA1, the 30th filtering One end of capacitor CA2, the 31st filter capacitor CA3 one end connected with one end of the second ferrite bean FB4, and connect the 5 feet of one low-dropout regulator U4, the other end ground connection simulation ground AGND of three filter capacitors.Second ferrite bean FB4's One end of the other end and the 32nd filter capacitor CA4, one end of the 33rd filter capacitor CA5, the 34th filter capacitor One end of CA6 all connects, and is connected to analog power AVCC, and the other end of three filter capacitors is all grounded simulation ground AGND.

As shown in figure 3-2, the control signal detecting part is divided to socket, two resistance and an electricity including 6 ports Hold.1 port of socket P1 connects voltage VIN；2 ports of socket P1,6 ports all earth shield ground EGND；5 ends of socket P1 Mouth, 4 ports are sequentially connected 7 feet of CAN interface integrated chip U5,6 feet；3 ports of socket P1 connect the 11st divider resistance One end of RC1 connects, one end, the 35th filtering of the other end and the 12nd divider resistance RC2 of the 11st divider resistance RC1 One end of capacitor CC1 connects, and is connected to 26 feet of CPU；The other end and the 35th filtered electrical of 12nd divider resistance RC2 The other end for holding CC1 is all grounded.

As shown in Fig. 3-3, the voltage VIN filter circuit includes 6 capacitors.One end of 36th filter capacitor CP1, One end of 37th filter capacitor CP2, one end of the 38th filter capacitor CP3, the 39th filter capacitor CP4 one End, one end of the 40th filter capacitor CP5, the 41st filter capacitor CP6 one end be all connected to power supply VIN, six filtering The other end of capacitor all earth shield ground EGND.

As shown in Figure 3-4, the input power VIN detection circuit includes 2 resistance and a capacitor.13rd partial pressure electricity Hinder a termination power VIN of RN1, one end of the other end and the 14th divider resistance RN2, the 42nd filter capacitor CN1 one End connection, and it is connected to 25 feet of CPU.The other end of 14th divider resistance RN2, the 42nd filter capacitor CN1 it is another End is all grounded.

As in Figure 3-5, the ground connection isolation module includes two ferrite beans, the model of ferrite bean HTY100505T-221Y-N；A termination simulation ground AGND of third ferrite bean FB5, other end ground connection；4th ferrite magnetic The termination shielding ground EGND of pearl FB6 mono-, other end ground connection.

As shown in figure 4, institute's displacement detection circuit includes five resistance, four capacitors, two operational amplifiers, Xiao Special based diode.The model LMC6482AIMX/NOPB of first operational amplifier and second operational amplifier；Two pole of Schottky The model NSR0140P2T5G of pipe；The inverting input terminal of first operational amplifier U3A and the one of the 43rd filter capacitor CS2 End, the 15th divider resistance RS2 one end be connected, normal phase input end is connected with one end of the second pull down resistor RS7, output end and One end of the other end of 43rd filter capacitor CS2, the other end of the 15th divider resistance RS2, the 16th divider resistance RS1 Connect, and is connected to 23 feet of CPU.The one of the inverting input terminal of second operational amplifier U3B and the 17th divider resistance RS5 One end connection at end, one end of third pull down resistor RS3, the 44th filter capacitor CS3, normal phase input end and the 18th partial pressure The cathode connection of one end of resistance RS4, one end of the 45th filter capacitor CS4, the first Schottky diode DS1, output end It is connect with the other end of the 17th divider resistance RS5, and is connected to 24 feet of CPU.The other end of second pull down resistor RS7, The other end of three pull down resistor RS3, the other end of the 44th filter capacitor CS3, the 45th filter capacitor CS4 it is another End, the positive of the first Schottky diode DS1 are all grounded simulation ground AGND.1 foot and the 46th filter capacitor of connector Ps One end of CS1 connects, and the other end of the 46th filter capacitor CS1 and the other end of the 16th divider resistance RS1 connect；It patches The other end connection of 3 feet and the 18th divider resistance RS4 of part Ps；2 feet of connector Ps meet simulation ground AGND.

As shown in figure 5, signal generating circuit includes switching power circuit and filter circuit.

As shown in fig. 6, the filter circuit of the H-bridge circuit of the left PWM control includes four capacitors.Wherein the 61st filter One end of wave capacitor CP10, one end of the 62nd filter capacitor CP11, one end of the 63rd filter capacitor CP12, the 60th One end of four filter capacitor CP13 is all connect with the end power supply VIN, and the other end of four filter capacitors all connects shielding ground.

As shown in fig. 7, the filter circuit of the H-bridge circuit of the right PWM control includes four capacitors.Wherein the 65th filter One end of wave capacitor CP20, one end of the 66th filter capacitor CP21, one end of the 67th filter capacitor CP22, the 60th One end of eight filter capacitor CP23 is all connect with the end power supply VIN, and the other end of four filter capacitors all connects shielding ground.

As shown in figure 8, detection signal filter circuit includes left-side signal filter circuit and right-side signal filter circuit.

STM32F407VGT6 in the RAM plate basic circuit is a 32 single-chip microcontrollers of ST Microelectronics, tool Standby CAN bus transmission-receiving function, has excellent performance, reasonable price, sufficiently meets the needs of hydraulic valve engineering field.The displacement inspection First, second operational amplifier of slowdown monitoring circuit part is the low consumed power operational amplifier integrated chip LMC6482AIMX/ of TI company NOPB, performance are stablized, and requirements are met.The voltage-releasing voltage stabilizer of the switching power circuit module is ALPHA&Omega The suitching type voltage-releasing voltage stabilizer AOZ1280CI of Semiconductor company, it is high-efficient, it is easy to use, it can flexibly be directed to Various applications optimize.Field-effect tube in the H-bridge circuit of the PWM control is ON Semiconductor company General (NPN/PNP) transistor BC847BPDW1T1G.The field-effect tube is double P/N of Infineon technology company The enhanced field-effect tube BSO615CG in channel.

The course of work:

Hydraulic valve current valve position signal is detected by displacement detecting circuit, according to required valve folding condition, is passed through CPU obtained after calculating 4 tunnels control signal TIM1CH1, TIM1CH2, TIM8CH1, TIM8CH2 for control in hydraulic valve 4 after Electric appliance folding, the folding of relay lead to the movement of iron shot in 4 channels, if the iron shot in the upper left corner and the lower right corner is mobile, channel Conducting, liquid flow to the lower right corner from the upper left corner, and iron core moves right in valve；If the iron shot in the upper right corner and the lower left corner is mobile, lead to Road conducting, liquid flow to the lower left corner from the upper right corner, and iron core is moved to the left in valve, thus the switch of control valve.Two, left side Relay is controlled by a circuit control, two, right side relay by another control circuit, and two control circuits are drawn respectively Stable signal VCL and VCR are input to CPU through filter circuit by two detection signal VCL0 and VCR0, are come through CPU analysis processing Adjustment controls signal to maintain the stabilization of control relay.

Claims

1. a kind of measurement of hydraulic selector valve and the control method of control circuit, the device being based on of this method includes RAM Plate basic circuit part, displacement signal detection circuit part and control signal output circuit part；

It is characterized by: the RAM plate basic circuit part includes CPU, voltage filter modular circuit, voltage transformation module electricity Road, serial ports downloading program module circuit, clock module circuit, starting module circuit and external power supply download interface circuit；It is described CPU use STM32F407VGT6 chip；

The voltage filter module includes that digital voltage VCC filtering and analog voltage AVCC filter two parts；Digital voltage VCC filter Wave part includes four capacitors；Wherein one end of the first filter capacitor CV17, one end of the second filter capacitor CV18, third filtering One end of capacitor CV19, the 4th filter capacitor CV20 one end all connect with the end power supply VCC, the other end of four filter capacitors All it is grounded；

The analog voltage AVCC filtering includes two capacitors；Wherein one end of the 5th filter capacitor CA7, the 6th filter capacitor One end of CA8 all connect with one end of analog power AVCC and connects 22 feet of CPU, and the other end of two filter capacitors all connects mould Quasi- ground AGND；

The voltage transformation module includes a capacitor；Wherein 49 feet of one end of the 7th filter capacitor CCAP2 and CPU connect, The other end of 7th filter capacitor CCAP2 is grounded；

The serial ports downloading program module includes two resistance and a capacitor；One end of first divider resistance RB3 with second point One end of piezoresistance RB4 connects, and the other end of the first divider resistance RB3 and the pin 94 of CPU connect；First storage capacitor One end of CRES1 is connected with the NRST interface of CPU, the other end connect and ground of the other end and the second divider resistance RB4；

The clock module includes a crystal oscillator and two capacitors；One end of first crystal oscillator Y1 and the one of the second storage capacitor CY1 End connection, and connect with the pin of CPU 12；The other end of first crystal oscillator Y1 is connect with one end of third storage capacitor CY2, and with The pin 13 of CPU connects；The other end of second storage capacitor CY1, the other end of third storage capacitor CY2 are all grounded；

The starting module includes a resistance；One end of first pull down resistor RB1 and the pin 37 of CPU connect, another termination Ground；

91 feet of the CPU are connect with one end of third divider resistance RCAN1, the other end and CAN of third divider resistance RCAN1 4 feet of Interface integration chip U5 connect；52 feet of CPU are connect with one end of the 4th divider resistance RCAN3, the 4th divider resistance The other end of RCAN3 is connect with 1 foot of the CAN interface integrated chip U5；74 feet of CPU, 99 feet, 27 feet, 10 feet ground connection, 50 feet, 75 feet, 100 feet, 28 feet, 11 feet meet power supply VCC, and 20 feet ground connection simulation ground AGND, 21 feet, 22 feet connect analog power AVCC；73 feet of CPU are connect with one end of the first decoupling capacitor CCAP1, the other end ground connection of the first decoupling capacitor CCAP1；CPU 19 feet connect the first pull-up resistor RA1, the first pull-up resistor RA1 another termination power VCC；The 29 feet connection the 5th of CPU The other end of one end of divider resistance RS6, the 5th divider resistance RS6 connects one end of the 8th filter capacitor CS5, and connects LVDT The positive input of part the first operational amplifier U3A, the other end connection simulation ground AGND of the 8th filter capacitor CS5；CPU 40 feet connect one end of the 6th divider resistance RT1, the other end of the 6th divider resistance RT1 connects the H-bridge circuit mould of left PWM control The other end of first current-limiting resistance R11, the tenth current-limiting resistance R41 in block；42 feet of CPU connect the one of the 7th divider resistance RT3 End, the other end of the 7th divider resistance RT3 connect the 7th current-limiting resistance R31, the 5th limit in the H-bridge circuit module of left PWM control The other end of leakage resistance R21；63 feet of CPU connect one end of the 8th divider resistance RT2, the other end of the 8th divider resistance RT2 Connect the other end of the 11st current-limiting resistance R51, the 20th current-limiting resistance R81 in the H-bridge circuit module of right PWM control；CPU's 64 feet connect one end of the 9th divider resistance RT4, and the other end of the 9th divider resistance RT4 connects the H-bridge circuit mould of right PWM control The other end of 17th current-limiting resistance R71, the 15th current-limiting resistance R61 in block；The pin that CPU is not mentioned herein all framves It is empty；

In addition there are external power supply interface P0, pin 1 meets power supply VCC, and pin 2 connects the pin 72 of CPU, and pin 3 connects the pin of CPU 76, pin 4 is grounded；

The CAN transceiver module includes a resistance and CAN interface integrated chip U5；The model of CAN interface integrated chip U5 SN65HVD232DR；One end of tenth divider resistance RCAN4 is connect with 7 feet of CAN interface integrated chip U5, the other end and CAN 6 feet of Interface integration chip U5 connect；2 feet of CAN interface integrated chip U5 are grounded；3 feet and electricity of CAN interface integrated chip U5 The connection of the source end VCC；

Power supply includes being depressured main filter module, control signal detection module, input power detection module, voltage filter Module and ground connection isolation module；

The main filter circuit module of decompression includes a low-dropout regulator, 26 capacitors and two ferrite beans； The model CAT6219-330TDGT3 of low-dropout regulator U4；The model HTY100505T-221Y-N of ferrite bean；The One end of nine filter capacitor CP7, one end of the tenth filter capacitor CP8 connect with+5V power supply and meet the first low-dropout regulator U4 1 foot, the other end of two filter capacitors is all grounded GND；One end of 11st filter capacitor CP14, the 12nd filter capacitor One end of CP15 is connected with 4 feet of the first low-dropout regulator U4, and the other end of two filter capacitors is all grounded；13rd filtering One end of capacitor CV1, one end of the 14th filter capacitor CV2, one end of the 15th filter capacitor CV3, the 16th filter capacitor One end of CV4, one end of the 17th filter capacitor CV5, one end of the 18th filter capacitor CV6, the 19th filter capacitor CV7 One end, the 20th filter capacitor CV8 one end connected with one end of the first ferrite bean FB3, and connect the first low voltage difference it is steady 5 feet of depressor U4, the other end ground connection of eight filter capacitors；The other end of first ferrite bean FB3 and the 21st filtering One end of capacitor CV9, one end of the 22nd filter capacitor CV10, one end of the 23rd filter capacitor CV11, the 24th One end of filter capacitor CV12, one end of the 25th filter capacitor CV13, one end of the 26th filter capacitor CV14, second One end of 17 filter capacitor CV15, one end of the 28th filter capacitor CV16 all connect, and are connected to power supply VCC, and eight The other end of filter capacitor is all grounded；One end, one end of the 30th filter capacitor CA2, third of 29th filter capacitor CA1 One end of 11 filter capacitor CA3 is connected with one end of the second ferrite bean FB4, and connects the first low-dropout regulator U4's 5 feet, the other end ground connection simulation ground AGND of three filter capacitors；The other end of second ferrite bean FB4 and the 32nd filter One end, one end of the 33rd filter capacitor CA5, one end of the 34th filter capacitor CA6 of wave capacitor CA4 all connects, and It is connected to analog power AVCC, the other end of three filter capacitors is all grounded simulation ground AGND；

The control signal detecting part is divided to socket, two resistance and a capacitor including 6 ports；1 port of socket P1 Connect voltage VIN；2 ports of socket P1,6 ports all earth shield ground EGND；5 ports, 4 ports of socket P1 are sequentially connected 7 feet, 6 feet of CAN interface integrated chip U5；One end that 3 ports of socket P1 connect the 11st divider resistance RC1 connects, and the tenth One end connection of one end, the 35th filter capacitor CC1 of the other end and the 12nd divider resistance RC2 of one divider resistance RC1, And it is connected to 26 feet of CPU；The other end of 12nd divider resistance RC2 and the other end of the 35th filter capacitor CC1 all connect Ground；

The voltage VIN filter circuit includes 6 capacitors；One end of 36th filter capacitor CP1, the 37th filter capacitor One end of CP2, one end of the 38th filter capacitor CP3, one end of the 39th filter capacitor CP4, the 40th filter capacitor One end of CP5, the 41st filter capacitor CP6 one end be all connected to power supply VIN, the other end of six filter capacitors is all grounded Shielding ground EGND；

The input power VIN detection circuit includes 2 resistance and a capacitor；A termination electricity of 13rd divider resistance RN1 One end connection of one end, the 42nd filter capacitor CN1 of source VIN, the other end and the 14th divider resistance RN2, and be connected to 25 feet of CPU；The other end of 14th divider resistance RN2, the other end of the 42nd filter capacitor CN1 are all grounded；

The ground connection isolation module includes two ferrite beans, the model HTY100505T-221Y-N of ferrite bean；The A termination simulation ground AGND of three ferrite bean FB5, other end ground connection；4th ferrite bean FB6 mono- termination shielding ground EGND, other end ground connection；

Institute's displacement detection circuit includes five resistance, four capacitors, two operational amplifiers, a Schottky diode；The The model LMC6482AIMX/NOPB of one operational amplifier and second operational amplifier；The model of Schottky diode NSR0140P2T5G；One end of the inverting input terminal of first operational amplifier U3A and the 43rd filter capacitor CS2, the 15th One end of divider resistance RS2 is connected, and normal phase input end is connected with one end of the second pull down resistor RS7, output end and the 43rd The other end of filter capacitor CS2, the other end of the 15th divider resistance RS2, the 16th divider resistance RS1 one end connect, and It is connected to 23 feet of CPU；Under one end of the inverting input terminal of second operational amplifier U3B and the 17th divider resistance RS5, third One end connection of one end of pull-up resistor RS3, the 44th filter capacitor CS3, normal phase input end and the 18th divider resistance RS4's The cathode connection of one end, one end of the 45th filter capacitor CS4, the first Schottky diode DS1, output end and the 17th point The other end of piezoresistance RS5 connects, and is connected to 24 feet of CPU；The other end, the third pull down resistor of second pull down resistor RS7 The other end of RS3, the other end of the 44th filter capacitor CS3, the 45th filter capacitor CS4 the other end, the first Xiao Te The anode of based diode DS1 all ground connection simulation ground AGND；1 foot of connector Ps and one end of the 46th filter capacitor CS1 connect It connects, the other end of the 46th filter capacitor CS1 and the other end of the 16th divider resistance RS1 connect；3 feet of connector Ps and The other end of 18th divider resistance RS4 connects；2 feet of connector Ps meet simulation ground AGND；

Signal generating circuit includes switching power circuit and filter circuit；

The switching power circuit module includes a suitching type voltage-releasing voltage stabilizer, two resistance and a capacitor；Described cuts Change the model U1AOZ1280CI of formula voltage-releasing voltage stabilizer；1 pin of first suitching type voltage-releasing voltage stabilizer U1,6 pins and first are anti- Feed holds the both ends connection of C5,2 pins ground connection, one end of 3 pins and the 19th divider resistance R1, the 20th divider resistance R2 One end connection, 4 pins are connect with 5 pins, power supply VIN；The other end of 19th divider resistance R1 is connect with+5V power supply, and second The other end of ten divider resistance R2 is grounded；

The filter circuit module includes 14 capacitors, two ferrite beans, an inductance and a Schottky diode； The model MBRA160T3G of the Schottky diode；The model HFY100505T-221Y-N of ferrite bean；First One end of filter inductance L1 is connect with 6 pins of the cathode of the second Schottky diode DP1, the first voltage-releasing voltage stabilizer U1；First One end of the other end of filter inductance L1 and the 47th filter capacitor C6, one end of the 48th filter capacitor C7, the 40th One end of nine filter capacitor C8, one end of the 50th filter capacitor C9, one end of the 51st filter capacitor C10, the 52nd One end connection of one end of filter capacitor C11, the 5th ferrite bean FB1；The other end and the 5th of 5th ferrite bean FB1 One end of 13 filter capacitor C12, one end of the 54th filter capacitor C13, one end of the 55th filter capacitor C14, One end connection of one end, the 6th ferrite bean FB2 of 56 filter capacitor C15；The other end of 6th ferrite bean FB2 With one end of the 57th filter capacitor C16, one end of the 58th filter capacitor C17, the 59th filter capacitor C18 one It holds, one end of the 60th filter capacitor C19 connects and connects+5V out-put supply；The other end of 14 filter capacitors and second The anode of Schottky diode DP1 is all grounded；

The H-bridge circuit of PWM control include left PWM control H-bridge circuit and its filter circuit, right PWM control H-bridge circuit and its Filter circuit；

The filter circuit of the H-bridge circuit of the left PWM control includes four capacitors；Wherein the one of the 61st filter capacitor CP10 End, one end of the 62nd filter capacitor CP11, one end of the 63rd filter capacitor CP12, the 64th filter capacitor CP13 One end all connect with the end power supply VIN, the other end of four filter capacitors all connect shielding ground；

The H-bridge circuit module of the left PWM control includes the connector of 2 ports, and two binary channels field-effect tube, four logical With triode, four zener diodes, 16 resistance；The model BSO615CG of the binary channels field-effect tube；It is general The model BC847BPDW1T1G of triode；1 pin of first general triode T1 is grounded, 2 pins and the first current-limiting resistance One end of R11 connects, and 6 pins are connect with one end of the second current-limiting resistance R12, remaining pin that do not mention herein all frame It is empty；The pin 4 of second general triode T2 is connect with power supply VIN, the both ends company of pin 5 and pin 6 and third current-limiting resistance R23 It connects, pin 3 is connect with one end of the 4th current-limiting resistance R22, and pin 2 is connect with one end of the 5th current-limiting resistance R21, and pin 1 connects Ground；The pin 6 of the general triode T3 of third is connect with one end of the 6th current-limiting resistance R32, pin 2 and the 7th current-limiting resistance R31 One end connection, pin 1 be grounded；The pin 4 of 4th general triode T4 is connect with input power VIN, pin 5 and pin 6 with The both ends of 8th current-limiting resistance R43 connect, and pin 3 is connect with one end of the 9th current-limiting resistance R42, pin 2 and the tenth current limliting electricity One end connection of R41 is hindered, pin 1 is grounded；

One end of the pin 4 of first binary channels field-effect tube Q1 and the first discharge resistance RD1, the first zener diode D1 one One end connection at end, the second current-limiting resistance R12, one end of pin 2 and the second discharge resistance RD2, the second zener diode D2 One end connection of one end, one end of the 4th current-limiting resistance R22, the first detection resistance RL2, pin 5, pin 6, pin 7, pin 8 It is connected with 1 port of connector PVL；The pin 4 of second bilateral field-effect tube Q2 and one end, the third of third discharge resistance RD3 The other end of one end connection of one end of zener diode D3, the 6th current-limiting resistance R32, pin 2 and the 4th discharge resistance RD4, One end connection of the other end, the 9th current-limiting resistance R42 of 4th zener diode D4, pin 5, pin 6, pin 7,8 and of pin 2 ports of connector PVL connect；The other end of first zener diode D1, the other end of the first discharge resistance RD1, first pair The pin 3 of channel field-effect tube Q1, the pin 3 of the second binary channels field-effect tube Q2, the other end of third discharge resistance RD3, Another termination power VIN of three zener diode D3, the other end of the second zener diode D2, the second discharge resistance RD2 it is another One end, the pin 1 of the first binary channels field-effect tube Q1, the second binary channels field-effect tube Q2 pin 1, the 4th discharge resistance RD4 The other end, the other end of the second zener diode D4, one end of first resistor RL2 and the second detection resistance RL1 one end connect It connects, another termination of the other end of the second detection resistance RL1 and the first detection resistance RL2 shield ground；

The filter circuit of the H-bridge circuit of the right PWM control includes four capacitors；Wherein the one of the 65th filter capacitor CP20 End, one end of the 66th filter capacitor CP21, one end of the 67th filter capacitor CP22, the 68th filter capacitor CP23 One end all connect with the end power supply VIN, the other end of four filter capacitors all connect shielding ground；

The H-bridge circuit module of the right PWM control includes two binary channels field-effect tube, four general triodes, four pressure stabilizings Diode, 16 resistance；The model BSO615CG of the binary channels field-effect tube；The model of general triode BC847BPDW1T1G；1 pin of 5th general triode T5 is grounded, and 2 pins are connect with one end of the 11st current-limiting resistance R51, 6 pins are connect with one end of the 12nd current-limiting resistance R52, remaining pin that do not mention herein is all aerial；6th general three The pin 4 of grade pipe T6 is connect with power supply VIN, and pin 5 and pin 6 are connect with the both ends of the 13rd current-limiting resistance R63, pin 3 and One end of 14th current-limiting resistance R62 connects, and pin 2 is connect with one end of the 15th current-limiting resistance R61, and pin 1 is grounded；7th The pin 6 of general triode T7 is connect with one end of the 16th current-limiting resistance R72, and the one of pin 2 and the 17th current-limiting resistance R71 End connection, pin 1 are grounded；The pin 4 of 8th general triode T8 is connect with input power VIN, pin 5 and pin 6 and the tenth The both ends of eight current-limiting resistance R83 connect, and pin 3 is connect with one end of the 19th current-limiting resistance R82, pin 2 and the 20th current limliting One end of resistance R81 connects, and pin 1 is grounded；

One end of the pin 4 of third binary channels field-effect tube Q5 and the 5th discharge resistance RD5, the 5th zener diode D5 one One end connection at end, the 12nd current-limiting resistance R52, one end, the 6th zener diode D6 of pin 2 and the 6th discharge resistance RD6 One end, the 14th current-limiting resistance R62 connection, pin 5, pin 6, pin 7, pin 8 are connected with 1 port of connector PVL；The One end of the pin 4 of four bilateral field-effect tube Q6 and the 7th discharge resistance RD7, one end of the 7th zener diode D7, the 16th One end of current-limiting resistance R72 connects, the other end of pin 2 and the 8th discharge resistance RD8, the 8th zener diode D8 it is another One end connection at end, the 16th current-limiting resistance R72, pin 5, pin 6, pin 7, pin 8 are connected with 2 ports of connector PVL； The other end of 5th zener diode D5, the other end of the 5th discharge resistance RD5, third binary channels field-effect tube Q5 pin 3, The pin 3 of 4th binary channels field-effect tube Q6, the other end of the 7th discharge resistance RD7, the 7th zener diode D7 the other end Connect power supply VIN, the other end of the 6th zener diode D6, the other end of the 6th discharge resistance RD6, third binary channels field-effect tube The pin 1 of Q5, the pin 1 of the 4th binary channels field-effect tube Q6, the 8th discharge resistance RD8 the other end, the 8th zener diode The other end of D8, one end of third detection resistance RL5 are connected with one end of the 4th resistance RL6, and third detection resistance RL5's is another Another termination of end and the 4th detection resistance RL6 shield ground；

Detecting signal filter circuit includes left-side signal filter circuit and right-side signal filter circuit；

The left-side signal filter circuit includes two resistance, four capacitors；One end and second of 21st divider resistance RL3 One end connection of one end of 12 divider resistance RL4, one end of the 69th filter capacitor CL1, the 70th filter capacitor CL2, One end of the other end of 22nd divider resistance RL4 and the 71st filter capacitor CL3, the 72nd filter capacitor CL4 One end connects and connects the ADC123_10 interface of CPU；The other end, the 70th filter capacitor CL2 of 69th filter capacitor CL1 The other end, the other end of the 71st filter capacitor CL3, the other end of the 72nd filter capacitor CL4 be all grounded；

The right-side signal filter circuit includes two resistance, four capacitors；One end and the 7th of 23rd divider resistance RL7 One end of 13 filter capacitor CL5, one end of the 74th filter capacitor CL6, the 24th divider resistance RL8 one end connect It connects, the other end of the 24th divider resistance RL8 and one end, the 76th filter capacitor CL8 of the 75th filter capacitor CL7 One end connect and connect the ADC123_11 interface of CPU；The other end, the 74th filter capacitor of 73rd filter capacitor CL5 The other end of CL6, the other end of the 75th filter capacitor CL7, the 76th filter capacitor CL8 the other end be all grounded；

When displacement detecting circuit detects hydraulic valve current valve position signal, according to required valve folding condition, counted by CPU 4 tunnels control signal TIM1CH1, TIM1CH2, TIM8CH1, TIM8CH2 is obtained after calculation to open for controlling 4 relays in hydraulic valve It closes, the folding of relay leads to the movement of iron shot in 4 channels, if the iron shot in the upper left corner and the lower right corner is mobile, channel conductive, liquid Body flows to the lower right corner from the upper left corner, and iron core moves right in valve；If the iron shot in the upper right corner and the lower left corner is mobile, channel conductive, Liquid flows to the lower left corner from the upper right corner, and iron core is moved to the left in valve, thus the switch of control valve；Two, left side relay by One circuit control, two, right side relay are controlled by another control circuit, and two control circuits draw two detections respectively Stable signal VCL and VCR are input to CPU through filter circuit by signal VCL0 and VCR0, are handled through CPU analysis to adjust control Signal with maintain control relay stabilization.