CN109538349B - Pneumatic control device and control method for valve - Google Patents
Pneumatic control device and control method for valve Download PDFInfo
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- CN109538349B CN109538349B CN201811631849.3A CN201811631849A CN109538349B CN 109538349 B CN109538349 B CN 109538349B CN 201811631849 A CN201811631849 A CN 201811631849A CN 109538349 B CN109538349 B CN 109538349B
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- control cavity
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
- F02B37/183—Arrangements of bypass valves or actuators therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/18—Control of the pumps by bypassing exhaust from the inlet to the outlet of turbine or to the atmosphere
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/52—Systems for actuating EGR valves
- F02M26/59—Systems for actuating EGR valves using positive pressure actuators; Check valves therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention provides a pneumatic control device of a valve, comprising: the valve comprises a proportional solenoid valve assembly, a valve core assembly, a valve body, a valve cover, a microcontroller, a sealing plug, a pressure sensor and an exhaust valve; an inner cavity is formed in the valve body, and a microcontroller cavity is formed in the outer side of the inner cavity; the valve core assembly is assembled in the inner cavity of the valve body in an interference mode, and the inner cavity of the valve body is divided into three independent cavities: an air inlet cavity, an air outlet cavity and a control cavity; the valve core assembly comprises a valve core, a valve core seat and a valve core spring; one end of the valve core is positioned in the exhaust cavity, the other end of the valve core is positioned in the control cavity, and a middle hole is formed in the valve core and used for communicating the exhaust cavity with the control cavity; the proportional electromagnetic valve component is inserted into the inner cavity of the valve body, is positioned at one side of the exhaust cavity and seals the exhaust cavity; the sealing plug is arranged in the exhaust cavity; the proportional solenoid valve assembly is controlled by the microcontroller and can push the sealing plug according to a set force to plug one end of the valve core. The invention can accurately adjust the opening degree of the controlled valve based on the closed-loop control principle.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a pneumatic control device and a pneumatic control method for a valve.
Background
With increasingly strict emission regulations, the application of electrically controlled bypass valve superchargers and electrically controlled EGR valve systems on engines is becoming more and more widespread; accurate control of supercharger bypass valve or EGR valve opening is a direction of development of the related art.
The electric control gas driving device and the motor four-bar driving device are the main flow technology at present, the electric control gas driving device is flexible to arrange, is little affected by temperature and has low cost; the motor four-bar drive device has high control precision, but has large structural arrangement and temperature environment influence, high cost and needs to be matched with a cooling device.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a pneumatic control device and a control method for a valve, wherein the valve core is simple in structure, consumes less compressed air, and can accurately adjust the opening of a controlled valve in real time according to the actual running condition of an engine based on the principle of closed-loop control; the technical scheme adopted by the invention is as follows:
a pneumatic control device for a valve, comprising: the valve comprises a proportional solenoid valve assembly, a valve core assembly, a valve body, a valve cover, a microcontroller, a sealing plug, a pressure sensor and an exhaust valve;
an inner cavity is formed in the valve body, and a microcontroller cavity is formed in the outer side of the inner cavity;
the valve core assembly is assembled in the inner cavity of the valve body in an interference mode, and the inner cavity of the valve body is divided into three independent cavities: an air inlet cavity, an air outlet cavity and a control cavity;
the valve core assembly comprises a valve core, a valve core seat and a valve core spring; the valve core seat is assembled in the inner cavity of the valve body in an interference manner, the valve core is arranged in the valve core seat and can slide, one end of the valve core is positioned in the exhaust cavity, the other end of the valve core is positioned in the control cavity, and a middle hole is formed in the valve core and used for communicating the exhaust cavity and the control cavity; the valve core is used for blocking or conducting the air inlet cavity and the control cavity; an air inlet communicated with the air inlet cavity is arranged on the valve body; a control port communicated with the control cavity is arranged on the valve body; the valve core spring is arranged in the control cavity, and two ends of the valve core spring respectively prop against the bottoms of the valve core and the control cavity;
the valve body is provided with an exhaust port and an exhaust valve, the exhaust cavity is communicated with the exhaust port, and the exhaust valve is arranged on the exhaust port;
the proportional electromagnetic valve component is inserted into the inner cavity of the valve body, is positioned at one side of the exhaust cavity and seals the exhaust cavity; the sealing plug is arranged in the exhaust cavity; the proportional electromagnetic valve component is controlled by the microcontroller and can push the sealing plug according to a set force to plug one end of the valve core;
the microcontroller is arranged in the microcontroller cavity and is provided with a pressure sensor; the pressure sensor extends into a sensor port formed in the valve body and seals the sensor port; the sensor port is communicated with the control cavity; the pressure sensor is used for detecting the pressure of the control cavity;
the valve cover is connected to the valve body and seals the microcontroller cavity;
the microcontroller is provided with a communication interface.
Further, the proportional solenoid valve assembly specifically comprises a coil, a static armature, a movable armature, a push rod and a return spring; the static armature is abutted against the valve core seat; the periphery of the front end of the static armature is provided with a first sealing ring; the ejector rod passes through the static armature, and the sealing plug is sleeved at the front end of the ejector rod; the movable armature iron is fixed with the rear part of the ejector rod, the return spring is sleeved on the ejector rod, and two ends of the return spring respectively abut against the movable armature iron and the static armature iron; the front part of the static armature is provided with an opening so that the exhaust cavity is communicated with the exhaust port; the coil is arranged on the periphery of the static armature.
Further, the proportional solenoid valve assembly is inserted into the inner cavity of the valve body and axially fixed through pins.
Further, the protruding part of the pressure sensor is provided with a second sealing ring to seal the sensor port.
Further, in the power-off state, the intake chamber and the control chamber are isolated from each other, and the intake chamber and the exhaust chamber are isolated from each other.
Further, a gasket is provided between the valve cover and the valve body.
Further, a vent plug is also provided on the valve body, which plug is in an opening of the microcontroller cavity.
The invention provides a pneumatic control method of a valve, which is applicable to a pneumatic control device of the valve, and comprises the following steps:
the microcontroller receives a target opening of the controlled valve;
calculating the target pressure of the control cavity according to the target opening of the controlled valve;
determining whether the control cavity pressure needs to be increased or decreased according to the fed-back current control cavity pressure;
if the pressure of the control cavity needs to be increased, the microcontroller determines the duty ratio of a PWM driving signal of the proportional solenoid valve assembly to be increased according to the pressure difference between the target pressure of the control cavity and the current pressure; the valve core is driven to move through the proportional electromagnetic valve assembly, so that the air inlet cavity is communicated with the control cavity, the control cavity is isolated from the air outlet cavity, the pressure of the control cavity rises, and the opening of the controlled valve is increased;
when the pressure of the control cavity rises to reach the target pressure, the microcontroller determines the duty ratio of a fixed PWM driving signal according to the target pressure of the control cavity, so that the electromagnetic force of the proportional electromagnetic valve assembly is smaller than the valve core spring force but larger than the pressure of the control cavity gas to the sealing plug; the control cavity is in a pressure maintaining state; the controlled valve is maintained at the corresponding opening degree;
if the pressure of the control cavity needs to be reduced, the microcontroller determines the duty ratio of the PWM driving signal of the proportional electromagnetic valve assembly needing to be reduced according to the pressure difference between the current pressure of the control cavity and the target pressure; the electromagnetic force of the proportional electromagnetic valve assembly is reduced to be smaller than the pressure of the control cavity gas to the sealing plug, the sealing plug is pushed away by the gas pressure in the control cavity, the gas in the control cavity enters the exhaust cavity and pushes the exhaust valve to be opened so as to be connected with the outside, and therefore the pressure of the control cavity is reduced, and the opening of the controlled valve is reduced;
when the pressure of the control cavity is reduced to the target pressure, the duty ratio of the PWM driving signal is increased to a certain value, so that the electromagnetic force of the proportional electromagnetic valve assembly is smaller than the valve core spring force but larger than the pressure of the control cavity gas to the sealing plug; the control cavity is in a pressure maintaining state; the controlled valve is maintained at the corresponding opening degree.
Further, when the pressure of the control cavity needs to be increased, the proportional solenoid valve assembly pushes the sealing plug to block one end of the valve core, so that the control cavity is isolated from the exhaust cavity, and the valve core is pushed to move, so that the air inlet cavity is communicated with the control cavity.
Further, if the pressure of the control cavity is detected to be reduced in the pressure maintaining state, the microcontroller returns to determine the duty ratio of the PWM driving signal of the proportional solenoid valve assembly to be increased according to the pressure difference between the target pressure of the control cavity and the current pressure.
Further, the microcontroller searches the control cavity target pressure corresponding to the target opening value according to calibration data of the corresponding relation between the pre-calibrated controlled valve opening and the control cavity pressure.
Further, when the duty ratio of the PWM driving signal of the proportional solenoid valve assembly is reduced to zero, the electromagnetic force of the proportional solenoid valve assembly is zero, the sealing plug and the valve core are disconnected, the control cavity is always communicated with the exhaust cavity, gas in the control cavity is exhausted outside through the exhaust valve, the pressure of the control cavity is close to zero, and the opening of the controlled valve is restored to zero.
The invention has the advantages that:
the opening of the controlled valve is regulated by regulating the gas pressure of the control cavity through the proportional electromagnetic valve, so that the control is accurate and the cost is low.
Has the pressure maintaining function, and does not consume a large amount of compressed air.
Closed-loop control of control cavity pressure; when the pressure of the control cavity is reduced due to leakage or other disturbance, the microcontroller can boost the pressure of the control cavity by increasing the duty ratio of the PWM driving signal in real time according to the current pressure of the control cavity detected by the pressure sensor, so that the pressure of the control cavity is always stabilized at a constant value, and the accuracy of controlling the opening of the controlled valve is improved.
And the calculation of the calibration data of the corresponding relation between the opening of the controlled valve and the pressure of the control cavity and the duty ratio of the driving signal of the proportional electromagnetic valve are transferred to the microcontroller, so that the workload of the ECU of the engine is reduced, the response speed of the switch of the controlled valve such as the bypass valve is improved, and the response speed of the supercharger is improved.
The microcontroller has CAN communication function, exchanges data with the engine ECU in real time, and ensures the rapidity and instantaneity of signal processing.
The inner cavity is isolated from the outside, waterproof, dustproof and breathable, and the microcontroller cavity is isolated from the outside.
Drawings
Fig. 1 is a cross-sectional view of the structure of the present invention.
Fig. 2 is a schematic diagram of the front appearance of the present invention.
Fig. 3 is a schematic view of the inverted appearance of the present invention.
FIG. 4 is a diagram showing the connection relationship between the present invention and the controlled valve.
Fig. 5 is a flow chart of a control method of the present invention.
Fig. 6 is a schematic diagram illustrating an operation state of the present invention.
Fig. 7 is a second schematic view of the working state of the present invention.
Detailed Description
The invention will be further described with reference to the following specific drawings and examples.
As shown in fig. 1, a pneumatic control device 1 for a valve according to the present invention includes:
the proportional solenoid valve assembly 2, the valve core assembly 3, the valve body 4, the valve cover 5, the microcontroller 6, the sealing plug 7, the pressure sensor 8 and the exhaust valve 9;
an inner cavity 44 is formed in the valve body 4, and a microcontroller cavity 13 is formed outside the inner cavity 44;
the valve core assembly 3 is assembled in the valve body inner cavity 44 in an interference mode, and the valve body inner cavity 44 is divided into three independent cavities: an intake chamber 38, an exhaust chamber 39, a control chamber 40; in the power-off state, the intake chamber 38 and the control chamber 40 are isolated from each other, and the intake chamber 38 and the exhaust chamber 39 are isolated from each other;
the valve core assembly 3 comprises a valve core 31, a valve core seat 32 and a valve core spring 33; the valve core seat 32 is assembled in the valve body cavity 44 in an interference manner, the valve core 31 is arranged in the valve core seat 32 and can slide, one end of the valve core 31 is positioned in the exhaust cavity 39, the other end of the valve core 31 is positioned in the control cavity 40, and a middle hole is formed in the valve core 31 and used for communicating the exhaust cavity 39 with the control cavity 40; the air inlet cavity 38 is positioned at the outer side of the middle part of the valve core seat 32, and the valve core 31 is used for blocking or conducting the air inlet cavity 38 and the control cavity 40; an air inlet 41 communicated with the air inlet cavity 38 is arranged on the valve body, and the air inlet 41 is positioned on the back surface of the valve body, as can be seen in fig. 3; a control port 43 for communicating with the control chamber 40 is provided on the valve body, the control port 43 being located on the front surface of the valve body, as can be seen in fig. 2; the valve core spring 33 is arranged in the control cavity 40, and two ends of the valve core spring are respectively propped against the bottoms of the valve core 31 and the control cavity 40;
the valve body 4 is provided with an exhaust port 42 and an exhaust valve 9, the exhaust cavity 39 is communicated with the exhaust port 42, and the exhaust valve 9 is arranged on the exhaust port 42; the exhaust valve 9 can ensure normal exhaust and prevent external foreign matters from entering the inner cavity of the valve body; the exhaust valve 9 is positioned at the bottom of the valve body 4;
the proportional solenoid valve assembly 2 is inserted into the inner cavity of the valve body, is positioned at one side of the exhaust cavity 39 and seals the exhaust cavity 39; the sealing plug 7 is arranged in the exhaust cavity 39; the proportional solenoid valve assembly 2 is controlled by the microcontroller 6 and can push the sealing plug 7 according to a set force to plug one end of the valve core 31;
the proportional solenoid valve assembly 2 specifically comprises a coil 21, a static armature 22, a movable armature 23, a push rod 24 and a return spring 25; the proportional solenoid valve component 2 is inserted into the inner cavity of the valve body and axially fixed through a pin; the static armature 22 is abutted against the valve core seat 32 and axially positioned; the periphery of the front end of the static armature 22 is provided with a first sealing ring 28, so that the exhaust cavity 39 is isolated from the outside; the ejector rod 24 passes through the static armature 22, and the sealing plug 7 is sleeved at the front end of the ejector rod 24; the rear parts of the movable armature 23 and the ejector rod 24 are fixed together, the return spring 25 is sleeved on the ejector rod 24, and two ends of the return spring respectively abut against the movable armature 23 and the static armature 22; the front part of the static armature 22 is provided with an opening so that the exhaust cavity 39 is communicated with the exhaust port 42; the coil 21 is arranged on the periphery of the static armature 22;
the microcontroller 6 is arranged in a microcontroller cavity 13, and the microcontroller 6 is provided with a pressure sensor 8; the pressure sensor 8 extends into a sensor port 45 formed in the valve body 4 and seals the sensor port 45, and specifically, a second sealing ring 14 is arranged on the protruding part of the pressure sensor 8 to seal the sensor port 45; the sensor port 45 communicates with the control chamber 40 to enable the pressure sensor 8 to detect control chamber pressure;
the valve cover 5 is connected to the valve body 4 through a screw and seals the microcontroller cavity 13; a gasket 15 may be provided between the valve cap 5 and the valve body 4; the microcontroller 6 is fixed on the inner side of the valve cover 5 through a screw;
the valve body 4 is also provided with a bleeder 10, and the bleeder 10 is blocked on an opening of the micro-controller cavity; when the gas pressure in the control chamber 40 is too high, a part of the gas under pressure may leak from the second seal ring 14 into the micro-controller chamber 13, and the pressure in the micro-controller chamber 13 increases, so that the gas can be discharged through the gas discharge plug 10.
The microcontroller 6 is provided with a communication interface 11; the communication interface 11 may be a wireless interface or a wired interface, in this example, a CAN communication interface is used, and the CAN communication interface is installed on the valve cover 5; the CAN communication interface 11 CAN be connected with an ECU of the engine through a wire harness; the proportional solenoid valve assembly 2 is driven and controlled by a microcontroller 6;
as shown in fig. 4, the pneumatic control device of the valve provided by the invention is applied to a turbocharger of an engine and is arranged on the engine at a position close to the turbocharger; the device can be used for controlling the opening degree of the bypass valve of the supercharger and also can be used for controlling the opening degree of the EGR valve of the supercharger; bypass valves or EGC valves may be used as the controlled valves of the present invention;
the engine ECU sends a valve opening signal to the device through the CAN bus according to the actual operation condition, and the device completes the closed-loop control of the valve opening of the controlled valve in real time;
in one example below, the intake port 41 is connected outwardly to a source of compressed air, inwardly to the intake chamber 38, and the control port 43 is connected outwardly to a wastegate diaphragm valve actuator, and inwardly to the control chamber 40; the output displacement of the bypass valve diaphragm valve actuator can be controlled by adjusting the pressure in the control cavity 40, and the opening of the waste gate valve can be adjusted;
the invention adopts a pneumatic control principle, and the opening of the valve of the controlled valve is precisely controlled by precisely controlling the air pressure in the diaphragm valve actuator, and the working pressure of the diaphragm valve actuator is 0-5 bar; the diaphragm valve actuator converts pressure into linear motion, one end of the diaphragm valve actuator is connected with a waste gate valve or an EGR valve through a connecting rod mechanism, and the other end of the diaphragm valve actuator is connected with a control port 43 of the control device through an air inlet hose; the air inlet 41 of the control device is connected with a compressed air source of an automobile or a compressed air tank through an air inlet hose, and the air inlet pressure is about 6-10 bar;
the proportional electromagnetic valve assembly 2 can realize the regulation of the pressure of a control cavity by regulating the duty ratio of PWM driving signals of the proportional electromagnetic valve assembly 2 based on a PWM control principle, and realize the arbitrary displacement output of the diaphragm valve actuator of 0-3 mm, so that the valve core of the controlled valve can keep different opening degrees, thereby controlling different air flow rates;
the built-in microcontroller 6 is an independent CAN communication node, has the functions of control, operation, communication and the like, and has the advantages of high reliability, convenience in use, strong communication function, perfect diagnosis and protection functions, wide adaptability and the like;
the control method of the controlled valve provided by the invention is shown in fig. 5;
when the engine is stopped, the proportional electromagnetic valve assembly 2 is in a power-off state, the movable armature 23 is far away from the static armature 22 under the action of the return spring 25, so that the sealing plug 7 is driven to be separated from the valve core 31, and the valve core spring 33 presses the valve core on the valve core seat 32; at this time, the air inlet cavity 38 and the control cavity 40 are blocked by the valve core, the compressed air is sealed in the air inlet cavity 38, the control cavity 40 is communicated with the air outlet cavity 39 through the middle hole of the valve core 31, the pressure in the control cavity is close to zero, and the opening degree of the controlled valve is zero; as shown in fig. 1;
when the operating condition of the engine is changed,
the engine ECU calculates the target opening of the controlled valve according to the actual working condition and sends the target opening to the microcontroller through CAN communication;
the microcontroller 6 calculates the target pressure of the control cavity according to the target opening of the controlled valve; for example, the microcontroller can find out the control cavity target pressure corresponding to the target opening value according to calibration data of the corresponding relation between the pre-calibrated opening of the controlled valve and the control cavity pressure;
the microcontroller 6 determines whether the control cavity pressure needs to be increased or decreased according to the current control cavity pressure fed back by the pressure sensor 8; for example, if the current control chamber pressure is less than the control chamber target pressure, the current control chamber pressure needs to be increased;
if the opening degree of the controlled valve needs to be increased, namely the pressure of the control cavity needs to be increased, the microcontroller 6 determines the duty ratio of the PWM driving signal of the proportional solenoid valve assembly which needs to be increased according to the pressure difference between the target pressure of the control cavity and the current pressure; the static armature 22 of the proportional electromagnetic valve assembly is controlled to generate a certain attractive force to the movable armature 23, so that the movable armature 23 pushes the valve core 31 to a certain distance through the ejector rod 24 and the sealing plug 7; at this time, the air inlet cavity 38 is communicated with the control cavity 40, the sealing plug 7 plugs one end of the valve core 31, the control cavity 40 and the air outlet cavity 39 are isolated by the sealing plug 7, and the pressure of the control cavity rises; the opening degree of the controlled valve is increased; as shown in fig. 6;
when the pressure sensor 8 detects that the pressure of the control cavity rises to reach the target pressure, the microcontroller determines the duty ratio of a fixed PWM driving signal according to the target pressure of the control cavity (the duty ratio can be properly reduced at the moment), so that the electromagnetic force of the proportional electromagnetic valve assembly is smaller than the valve core spring force but larger than the pressure of the gas of the control cavity to the sealing plug; the valve core 31 is pressed back to the valve core seat 32 by the valve core spring 33, and the electromagnetic force can still push the sealing plug 7 on the valve core 31; at this time, the air intake chamber 38, the air exhaust chamber 39, and the control chamber 40 are isolated from each other, and the control chamber is in a pressure maintaining state; controlling the cavity pressure to maintain the controlled valve at a constant opening; as shown in fig. 7;
if the pressure maintaining state detects that the pressure of the control cavity is reduced and the control cavity is possibly leaked due to the fact that the valve core is not blocked by the sealing plug, returning to the microcontroller 6 to determine the duty ratio of the PWM driving signal of the proportional electromagnetic valve assembly to be increased according to the pressure difference between the target pressure of the control cavity and the current pressure;
if the opening degree of the controlled valve needs to be reduced, namely the pressure of the control cavity needs to be reduced, the microcontroller 6 determines the duty ratio of the PWM driving signal of the proportional electromagnetic valve assembly which needs to be reduced according to the pressure difference between the current pressure of the control cavity and the target pressure; the electromagnetic force of the proportional electromagnetic valve assembly is reduced to be smaller than the pressure of the control cavity gas to the sealing plug, the sealing plug is pushed away by the gas pressure in the control cavity, the sealing plug is separated from the valve core, the gas in the control cavity enters the exhaust cavity and pushes the exhaust valve 9 to be opened and connected with the outside, so that the pressure of the control cavity is reduced, and the opening of the controlled valve is reduced;
when the pressure of the control cavity is reduced to the target pressure, the duty ratio of the PWM driving signal is increased to a certain value, so that the electromagnetic force of the proportional electromagnetic valve assembly is smaller than the valve core spring force but larger than the pressure of the control cavity gas to the sealing plug; the sealing plug 7 is propped against the valve core 31 again, the control cavity 40 is isolated from the exhaust cavity 39, the control cavity is in a pressure maintaining state, and the pressure of the control cavity enables the controlled valve to be maintained at a corresponding opening;
when the duty ratio of the PWM driving signal of the proportional solenoid valve assembly 2 is reduced to zero, i.e. the power is turned off, and the electromagnetic force of the proportional solenoid valve assembly 2 is zero, the return spring 25 drives the sealing plug 7 to return to the initial position, the sealing plug and the valve core are separated, the control cavity 40 is always communicated with the exhaust cavity 39, the gas in the control cavity 40 is exhausted from the outside through the exhaust valve, the pressure of the control cavity is close to zero, and the opening of the controlled valve is restored to zero.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (11)
1. A pneumatic control device for a valve, comprising:
the proportional electromagnetic valve comprises a proportional electromagnetic valve assembly (2), a valve core assembly (3), a valve body (4), a valve cover (5), a microcontroller (6), a sealing plug (7), a pressure sensor (8) and an exhaust valve (9);
an inner cavity (44) is formed in the valve body (4), and a microcontroller cavity (13) is formed outside the inner cavity (44);
the valve core assembly (3) is assembled in the valve body inner cavity (44) in an interference mode, and the valve body inner cavity (44) is divided into three mutually independent cavities: an air inlet cavity (38), an air outlet cavity (39) and a control cavity (40);
the valve core assembly (3) comprises a valve core (31), a valve core seat (32) and a valve core spring (33); the valve core seat (32) is assembled in the valve body inner cavity (44) in an interference manner, the valve core (31) is arranged in the valve core seat (32) and can slide, one end of the valve core (31) is positioned in the exhaust cavity (39), the other end of the valve core is positioned in the control cavity (40), and a middle hole is formed in the valve core (31) and used for communicating the exhaust cavity (39) with the control cavity (40); the air inlet cavity (38) is positioned at the outer side of the middle part of the valve core seat (32), and the valve core (31) is used for blocking or conducting the air inlet cavity (38) and the control cavity (40); an air inlet (41) communicated with the air inlet cavity (38) is arranged on the valve body; a control port (43) communicated with the control cavity (40) is arranged on the valve body; the valve core spring (33) is arranged in the control cavity (40), and two ends of the valve core spring are respectively propped against the bottoms of the valve core (31) and the control cavity (40);
an exhaust port (42) and an exhaust valve (9) are arranged on the valve body (4), the exhaust cavity (39) is communicated with the exhaust port (42), and the exhaust valve (9) is arranged on the exhaust port (42);
the proportional solenoid valve assembly (2) is inserted into the inner cavity of the valve body, is positioned at one side of the exhaust cavity (39) and seals the exhaust cavity (39); the sealing plug (7) is arranged in the exhaust cavity (39); the proportional electromagnetic valve assembly (2) is controlled by the microcontroller (6) and can push the sealing plug (7) according to a set force so as to plug one end of the valve core (31);
the microcontroller (6) is arranged in the microcontroller cavity (13), and the microcontroller (6) is provided with a pressure sensor (8); the pressure sensor (8) stretches into a sensor port (45) formed in the valve body (4) and seals the sensor port (45); the sensor port (45) is communicated with the control cavity (40); the pressure sensor (8) is used for detecting the pressure of the control cavity;
the valve cover (5) is connected to the valve body (4) and seals the microcontroller cavity (13);
the microcontroller (6) is provided with a communication interface (11).
2. A pneumatic control device for a valve as claimed in claim 1, wherein,
the proportional electromagnetic valve assembly (2) specifically comprises a coil (21), a static armature (22), a movable armature (23), a push rod (24) and a return spring (25); the static armature (22) is abutted against the valve core seat (32); the periphery of the front end of the static armature (22) is provided with a first sealing ring (28); the ejector rod (24) passes through the static armature (22), and the sealing plug (7) is sleeved at the front end of the ejector rod (24); the movable armature (23) is fixed with the rear part of the ejector rod (24), the return spring (25) is sleeved on the ejector rod (24), and two ends of the return spring are respectively propped against the movable armature (23) and the static armature (22); an opening is arranged at the front part of the static armature (22) so that the exhaust cavity (39) is communicated with the exhaust port (42); the coil (21) is arranged on the periphery of the static armature (22).
3. A pneumatic control device for a valve as claimed in claim 2, wherein,
the proportional solenoid valve assembly (2) is inserted into the inner cavity of the valve body and is axially fixed through a pin.
4. A pneumatic control device for a valve as claimed in claim 1, wherein,
the protruding part of the pressure sensor (8) is provided with a second sealing ring (14) to realize the sealing of the sensor port (45).
5. A pneumatic control device for a valve as claimed in claim 1, wherein,
in the power-off state, the intake chamber (38) and the control chamber (40) are isolated from each other, and the intake chamber (38) and the exhaust chamber (39) are isolated from each other.
6. A pneumatic control device for a valve as claimed in claim 1, wherein,
the valve body (4) is also provided with a vent plug (10), and the vent plug (10) is blocked on an opening of the micro-controller cavity.
7. A pneumatic control method for a valve, which is applied to a pneumatic control device for a valve according to any one of claims 1 to 6,
the microcontroller receives a target opening of the controlled valve;
calculating the target pressure of the control cavity according to the target opening of the controlled valve;
determining whether the control cavity pressure needs to be increased or decreased according to the fed-back current control cavity pressure;
if the pressure of the control cavity needs to be increased, the microcontroller determines the duty ratio of a PWM driving signal of the proportional solenoid valve assembly to be increased according to the pressure difference between the target pressure of the control cavity and the current pressure; the valve core is driven to move through the proportional electromagnetic valve assembly, so that the air inlet cavity is communicated with the control cavity, the control cavity is isolated from the air outlet cavity, the pressure of the control cavity rises, and the opening of the controlled valve is increased;
when the pressure of the control cavity rises to reach the target pressure, the microcontroller determines the duty ratio of a fixed PWM driving signal according to the target pressure of the control cavity, so that the electromagnetic force of the proportional electromagnetic valve assembly is smaller than the valve core spring force but larger than the pressure of the control cavity gas to the sealing plug; the control cavity is in a pressure maintaining state; the controlled valve is maintained at the corresponding opening degree;
if the pressure of the control cavity needs to be reduced, the microcontroller determines the duty ratio of the PWM driving signal of the proportional electromagnetic valve assembly needing to be reduced according to the pressure difference between the current pressure of the control cavity and the target pressure; the electromagnetic force of the proportional electromagnetic valve assembly is reduced to be smaller than the pressure of the control cavity gas to the sealing plug, the sealing plug is pushed away by the gas pressure in the control cavity, the gas in the control cavity enters the exhaust cavity and pushes the exhaust valve to be opened so as to be connected with the outside, and therefore the pressure of the control cavity is reduced, and the opening of the controlled valve is reduced;
when the pressure of the control cavity is reduced to the target pressure, the duty ratio of the PWM driving signal is increased to a certain value, so that the electromagnetic force of the proportional electromagnetic valve assembly is smaller than the valve core spring force but larger than the pressure of the control cavity gas to the sealing plug; the control cavity is in a pressure maintaining state; the controlled valve is maintained at the corresponding opening degree.
8. A method for pneumatic control of a valve as set forth in claim 7, wherein,
when the pressure of the control cavity needs to be increased, the proportional solenoid valve assembly pushes the sealing plug to block one end of the valve core, so that the control cavity is isolated from the exhaust cavity, and the valve core is pushed to move, so that the air inlet cavity is communicated with the control cavity.
9. A method for pneumatic control of a valve as set forth in claim 7, wherein,
if the pressure maintaining state is detected that the pressure of the control cavity is reduced, returning to the microcontroller to determine the duty ratio of the PWM driving signal of the proportional solenoid valve assembly to be increased according to the pressure difference between the target pressure of the control cavity and the current pressure.
10. A method for pneumatic control of a valve as set forth in claim 7, wherein,
and the microcontroller searches the control cavity target pressure corresponding to the target opening value according to calibration data of the corresponding relation between the pre-calibrated controlled valve opening and the control cavity pressure.
11. A method for pneumatic control of a valve as set forth in claim 7, wherein,
when the duty ratio of PWM driving signals of the proportional electromagnetic valve assembly is reduced to zero, electromagnetic force of the proportional electromagnetic valve assembly is zero, the sealing plug is separated from the valve core, the control cavity is always communicated with the exhaust cavity, gas in the control cavity is exhausted outside through the exhaust valve, the pressure of the control cavity is close to zero, and the opening of the controlled valve is restored to zero.
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| CN110206637B (en) * | 2019-05-07 | 2021-07-09 | 一汽解放汽车有限公司 | Electromagnetic valve driving circuit of engine pneumatic actuator and control method |
| CN114352790A (en) * | 2022-03-21 | 2022-04-15 | 宁波佳尔灵气动机械有限公司 | Plug-in type electric pressure proportional valve |
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