CN112065614B - Proportional solenoid valve control method and device, electronic equipment and storage medium - Google Patents
Proportional solenoid valve control method and device, electronic equipment and storage medium Download PDFInfo
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- CN112065614B CN112065614B CN202010902872.2A CN202010902872A CN112065614B CN 112065614 B CN112065614 B CN 112065614B CN 202010902872 A CN202010902872 A CN 202010902872A CN 112065614 B CN112065614 B CN 112065614B
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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
- F02M26/53—Systems for actuating EGR valves using electric actuators, e.g. solenoids
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Abstract
The invention relates to the technical field of engine control, in particular to a proportional solenoid valve control method, a proportional solenoid valve control device, electronic equipment and a storage medium. The method comprises the following steps: determining a first duty ratio according to the required opening degree of the electromagnetic valve, and controlling the opening degree of the proportional electromagnetic valve according to the first duty ratio; acquiring the current value of the proportional solenoid valve, and acquiring a duty ratio correction value according to the current value; and determining a second duty ratio according to the first duty ratio and the duty ratio correction value, and controlling the opening of the proportional solenoid valve according to the second duty ratio. According to the method and the device, the expected first duty ratio is obtained according to the required opening degree of the electromagnetic valve, the current value of the electromagnetic valve is obtained to obtain the duty ratio correction value, the corrected second duty ratio is generated to control the opening degree of the electromagnetic valve, so that the stable state deviation of the electromagnetic valve caused by the influence of the external temperature, the self heating of the electromagnetic coil and the fluctuation of the power supply voltage is avoided, the accuracy of the electromagnetic valve control is improved, and the control quality of an engine system is improved.
Description
Technical Field
The invention relates to the technical field of engine control, in particular to a proportional solenoid valve control method, a proportional solenoid valve control device, electronic equipment and a storage medium.
Background
At present, fluid-machine-electronics is widely applied to a digital control process due to the characteristics of convenient control, easy implementation, good controllability and the like, for example, an EGR (Exhaust Gas recirculation) proportional control solenoid valve of an engine controls the opening of an EGR valve by using the Pulse Width Modulation (PWM) duty ratio, so as to control the EGR rate, and in addition, the flow of fuel entering a common rail is controlled by a flow measurement method in a high-pressure common rail system to control the rise and fall of the pressure in the common rail. The control precision of the PWM proportional solenoid valve directly influences the normal work of the system and whether the system meets the emission regulation or not. The PWM proportional electromagnetic valve position accurate control method adjusts the current in the electromagnetic coil through the PWM duty ratio, controls the attraction force of the electromagnetic valve to adjust the position of the mechanical electromagnetic valve, and indirectly adjusts the flow rate of the fluid by adjusting the opening of the valve body, but the PWM proportional electromagnetic valve control is easily influenced by the external temperature, the self heating of the electromagnetic coil and the fluctuation of the power supply voltage, and directly influences the position of the electromagnetic valve under the steady state condition, so that the steady state position deviates from the preset control position, and finally the control quality of the whole system is reduced.
Disclosure of Invention
The invention mainly aims to provide a proportional solenoid valve control method, a proportional solenoid valve control device, electronic equipment and a storage medium, and aims to solve the technical problem of low precision when a proportional solenoid valve is controlled through PWM in the prior art.
In order to achieve the above object, the present invention provides a proportional solenoid valve control method, comprising the steps of:
determining a first duty ratio according to the required opening degree of the electromagnetic valve, and controlling the opening degree of the proportional electromagnetic valve according to the first duty ratio;
acquiring the current value of the proportional solenoid valve, and acquiring a duty ratio correction value according to the current value;
and determining a second duty ratio according to the first duty ratio and the duty ratio correction value, and controlling the opening of the proportional solenoid valve according to the second duty ratio.
Optionally, the step of obtaining the current value of the proportional solenoid valve and obtaining the duty ratio correction value according to the current value specifically includes:
acquiring the current value of the proportional solenoid valve, and performing integral filtering on the current value to acquire a steady-state current value;
obtaining a current duty ratio, and performing steady state judgment according to the current duty ratio and the steady state current value;
and acquiring a duty ratio correction value according to a steady state judgment result and the steady state current value.
Optionally, the step of obtaining the current duty ratio and performing steady state judgment according to the current duty ratio and the steady state current value specifically includes:
acquiring a current duty ratio, and acquiring a current driving current value according to the current duty ratio;
and acquiring an absolute value of the difference between the steady-state voltage value and the current driving current value, determining the current output duty ratio according to the current duty ratio, and performing steady-state judgment according to the absolute value and the current output duty ratio.
Optionally, the step of obtaining the duty ratio correction value according to the steady-state determination result and the steady-state current value specifically includes:
when the steady state judgment result is that the absolute value is larger than a preset absolute value, acquiring a temperature change value of the electromagnetic valve, determining a resistance change value of the electromagnetic valve according to the temperature change value, and acquiring the duty ratio correction value according to the resistance change value of the electromagnetic valve and the steady state current value;
and when the steady state judgment result is that the absolute value is less than or equal to a preset absolute value and the current output duty ratio is not equal to the first duty ratio, starting timing and obtaining a first timing duration, when the first timing duration is equal to the preset delay filtering duration, obtaining a temperature change value of the electromagnetic valve, determining a resistance change value of the electromagnetic valve according to the temperature change value, and obtaining the duty ratio correction value according to the resistance change value of the electromagnetic valve and the steady state current value.
Optionally, the step of determining a second duty ratio according to the first duty ratio and the duty ratio correction value, and controlling the opening of the proportional solenoid valve according to the second duty ratio specifically includes:
correcting the first duty ratio according to the duty ratio correction value to determine a second duty ratio;
and controlling the opening of the proportional solenoid valve according to the second duty ratio.
Optionally, the step of determining a first duty ratio according to the required opening degree of the electromagnetic valve and controlling the opening degree of the proportional electromagnetic valve according to the first duty ratio specifically includes:
determining a first duty ratio according to the required opening degree of the electromagnetic valve, and converting the first duty ratio into a first duty ratio control signal;
and outputting the first duty ratio control signal to an electromagnetic valve driving circuit so that the electromagnetic valve driving circuit controls the opening degree of the proportional electromagnetic valve.
Optionally, the step of controlling the opening of the proportional solenoid valve according to the second duty ratio specifically includes:
and converting the second duty ratio into a second duty ratio control signal, and outputting the second duty ratio control signal to an electromagnetic valve driving circuit so that the electromagnetic valve driving circuit controls the opening degree of the proportional electromagnetic valve.
Further, to achieve the above object, the present invention also proposes a proportional solenoid valve control device including:
the first control module is used for determining a first duty ratio according to the required opening of the electromagnetic valve and controlling the opening of the proportional electromagnetic valve according to the first duty ratio;
the correction module is used for acquiring the current value of the proportional solenoid valve and acquiring a duty ratio correction value according to the current value;
and the second control module is used for determining a second duty ratio according to the first duty ratio and the duty ratio correction value and controlling the opening of the proportional solenoid valve according to the second duty ratio.
In addition, to achieve the above object, the present invention also provides an electronic device, including: a memory, a processor, and a proportional solenoid valve control program stored on the memory and executable on the processor, the proportional solenoid valve control program configured to implement the steps of the proportional solenoid valve control method as described above.
In addition, to achieve the above object, the present invention further provides a storage medium having a proportional solenoid valve control program stored thereon, which when executed by a processor implements the steps of the proportional solenoid valve control method as described above.
The method comprises the steps of determining a first duty ratio according to the required opening degree of the electromagnetic valve, and controlling the opening degree of the proportional electromagnetic valve according to the first duty ratio; acquiring the current value of the proportional solenoid valve, and acquiring a duty ratio correction value according to the current value; and determining a second duty ratio according to the first duty ratio and the duty ratio correction value, and controlling the opening of the proportional solenoid valve according to the second duty ratio. According to the method and the device, the expected first duty ratio is obtained according to the required opening degree of the electromagnetic valve, the current value of the electromagnetic valve is obtained to obtain the duty ratio correction value, the corrected second duty ratio is generated to control the opening degree of the electromagnetic valve, so that the stable state deviation of the electromagnetic valve caused by the influence of the external temperature, the self heating of the electromagnetic coil and the fluctuation of the power supply voltage is avoided, the accuracy of the electromagnetic valve control is improved, and the control quality of an engine system is improved.
Drawings
Fig. 1 is a schematic structural diagram of an electronic device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a first embodiment of a proportional solenoid control method according to the present invention;
FIG. 3 is a schematic flow chart of a second embodiment of a proportional solenoid control method of the present invention;
FIG. 4 is a schematic diagram of a solenoid valve driving circuit according to an embodiment of a proportional solenoid valve control method of the present invention;
fig. 5 is a block diagram showing the configuration of the first embodiment of the proportional solenoid valve control apparatus of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| RL | Equivalent resistance of flow electromagnetic valve | Q | MOS tube |
| Rd | Diode equivalent resistance | D | Diode with a high-voltage source |
| Rs | Power supply resistor | L | Flow electromagnetic valve inductor |
| Vs | Supply voltage |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the electronic device may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or may be a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the electronic device and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a storage medium, may include therein an operating system, a network communication module, a user interface module, and a proportional solenoid valve control program.
In the electronic apparatus shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the electronic device according to the present invention may be provided in the electronic device, and the electronic device calls the proportional solenoid valve control program stored in the memory 1005 through the processor 1001 and executes the proportional solenoid valve control method according to the embodiment of the present invention.
An embodiment of the present invention provides a method for controlling a proportional solenoid valve, and referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of the method for controlling a proportional solenoid valve according to the present invention.
In this embodiment, the proportional solenoid valve control method includes the following steps:
step S10: and determining a first duty ratio according to the required opening degree of the electromagnetic valve, and controlling the opening degree of the proportional electromagnetic valve according to the first duty ratio.
It should be noted that the required opening degree of the electromagnetic valve can be determined according to the exhaust gas recirculation requirement of the engine, and the required opening degree of the electromagnetic valve is determined according to the existing control algorithm and the exhaust gas recirculation requirement. After the required opening degree of the electromagnetic valve is obtained, a electromagnetic valve opening degree-target duty ratio table can be queried according to the required opening degree of the electromagnetic valve to obtain the first duty ratio. The electromagnetic valve opening-target duty ratio table is obtained by calibrating corresponding parameters under experimental conditions. And inputting an electric signal corresponding to the first duty ratio into a duty ratio Pulse Width Modulation (PWM) generator to generate a PWM signal, wherein the PWM signal acts on an MOS (metal oxide semiconductor) tube of the electromagnetic valve driving circuit to enable the MOS tube to be conducted and closed, and the average current of the inductor of the flow electromagnetic valve is changed to control the flow electromagnetic valve so as to obtain the required opening degrees with different duty ratios.
Step S20: and acquiring the current value of the proportional solenoid valve, and acquiring a duty ratio correction value according to the current value.
It is easily understood that the first duty ratio is a desired duty ratio, and in a specific implementation, the resistance of the coil of the solenoid valve is increased due to the temperature rise, so that the current in the circuit is reduced under the same duty ratio, and the output current needs to be improved for the duty ratio correction. Meanwhile, voltage fluctuation can also be caused by power supply fluctuation of the electromagnetic valve, so that the interference caused by both resistance temperature rise and voltage must be considered at the same time to be output as the final duty ratio.
It should be noted that, after the state of the solenoid valve is stable, the current in the solenoid valve reaches a relatively stable state, the current value can be obtained, the resistance value change value of the equivalent resistor of the flow solenoid valve can be obtained according to the current temperature, and the duty ratio correction value is reversely deduced according to the current value and the resistance value change value.
Step S30: and determining a second duty ratio according to the first duty ratio and the duty ratio correction value, and controlling the opening of the proportional solenoid valve according to the second duty ratio.
It is easy to understand that after the duty ratio correction value is obtained, the expected first duty ratio is corrected according to the duty ratio correction value to obtain a second duty ratio, and the second duty ratio is a corrected duty ratio.
Further, in order to obtain the corrected duty ratio, step S30 specifically includes: correcting the first duty ratio according to the duty ratio correction value to determine a second duty ratio; and controlling the opening of the proportional solenoid valve according to the second duty ratio.
It is easy to understand that, when the solenoid valve control is performed according to the second duty ratio, the correction is performed in real time if the temperature changes. In the present invention, the first duty ratio and the second duty ratio are only called for convenience of explanation, and do not represent the size of the two.
According to the embodiment of the invention, the opening degree of the electromagnetic valve is controlled through the corrected duty ratio by the method, so that the control precision of the electromagnetic valve is improved, the influence of temperature change on the electromagnetic valve is prevented, and excessive discharge of the engine caused by the position offset change of the electromagnetic valve is prevented.
Referring to fig. 3, fig. 3 is a schematic flow chart illustrating a control method of a proportional solenoid valve according to a third embodiment of the present invention. Referring to fig. 4, fig. 4 is a schematic diagram of a solenoid valve driving circuit according to an embodiment of a proportional solenoid valve control method of the present invention. Based on the first embodiment, the method for controlling a proportional solenoid valve in this embodiment specifically includes, in step S10:
step S101: determining a first duty ratio according to the required opening degree of the electromagnetic valve, converting the first duty ratio into a first duty ratio control signal, and outputting the first duty ratio control signal to an electromagnetic valve driving circuit so that the electromagnetic valve driving circuit controls the opening degree of the proportional electromagnetic valve.
It is easy to understand that, based on the first embodiment, the first duty ratio is obtained and is converted into an electric signal, that is, the first duty ratio control signal.
The solenoid valve driving circuit includes: MOS pipe Q, diode D, flow solenoid valve equivalent resistance RL, diode equivalent resistance Rd, power supply resistance Rs and flow solenoid valve inductance L. The grid of MOS pipe Q is solenoid valve drive circuit's input receives first duty ratio control signal, and MOS pipe Q's source electrode and supply resistor Rs's second end are connected, and supply resistor Rs's first end and supply voltage Vs's input are connected. And the drain electrode of the MOS tube Q is connected with the first end of the equivalent resistor RL of the flow electromagnetic valve and is also connected with the cathode of the diode D. The anode of the diode D is connected with the first end of the diode equivalent resistor Rd, the second end of the diode equivalent resistor Rd is grounded, the second end of the diode equivalent resistor Rd is also connected with the second end of the flow solenoid valve inductor L, and the first end of the flow solenoid valve inductor L is connected with the second end of the flow solenoid valve equivalent resistor RL.
In specific implementation, the solenoid valve driving circuit can also be a simpler or more complex structure according to the control requirement, and the circuit diagram of the embodiment of the invention is only for explanation. And a first duty ratio control signal is input to the grid electrode of the MOS tube Q to control the on and off of the MOS tube Q, so that the inductor L of the flow electromagnetic valve forms alternating current, and the flow electromagnetic valve is controlled through an electromagnetic effect.
The step S30 includes the step S301: and converting the second duty ratio into a second duty ratio control signal, and outputting the second duty ratio control signal to an electromagnetic valve driving circuit so that the electromagnetic valve driving circuit controls the opening degree of the proportional electromagnetic valve.
It is easy to understand that the principle of step S301 is the same as that of step S101, and the detailed description is omitted here.
Further, in order to obtain the correction value, in step S20, the method specifically includes:
step S201: and acquiring the current value of the proportional solenoid valve, and performing integral filtering on the current value to acquire a steady-state current value.
It should be noted that, under different duty ratios, the average current value in the electromagnetic coil can be expressed as the following formula (1):
the current average current value is the current value. In formula (1), Us is the supply voltage in units of V; rs is the internal resistance of the power supply (in Ohm); rd is diode equivalent resistance (in Ohm); vd is the forward voltage drop of the Schottky diode and is 0.7V; RL is the equivalent resistance (Ohm) of the flow electromagnetic valve; l is the flow solenoid valve inductance, unit H; d is the PWM duty cycle; i isLIs the average current through the inductor, in units a; t is the PWM period in units of s.
Due to the correction value and the current duty ratio d, the target current ILtTrue current in the electromagnetic coil ILrPower supply voltage UsForward conducting voltage drop V of sum diodedThe parameters are related. Therefore, when calculating the correction, it is necessary to filter the input measurement data, ILrThe processing of the data should be especially noted that the integral filtering process must be performed under a steady state condition, i.e. the duty ratio is not changed, while maintaining a sufficiently long time, which is an important basis for ensuring the accuracy of the duty ratio correction.
In a steady state, the filtering process is to obtain a steady state current value under the temperature condition of the current temperature electromagnetic valve, namely ILr，ILrIs calculated as in (2)
In the formula (2), t is the current operation time; t ispIs the filter period time constant; i (t) is the current value output by the sensor; i isLrIs the filter average current value.
Step S202: and acquiring the current duty ratio, and performing steady state judgment according to the current duty ratio and the steady state current value.
It is easy to understand that the current duty ratio is a duty ratio adopted by the current control solenoid valve, and according to the current actual situation, the current duty ratio may be a first duty ratio (a situation that the duty ratio needs to be corrected due to a temperature change for the first time) or a duty ratio after the previous correction (the current duty ratio is a duty ratio after real-time correction).
Step S202, specifically including: acquiring a current duty ratio, and acquiring a current driving current value according to the current duty ratio; and acquiring an absolute value of the difference between the steady-state voltage value and the current driving current value, determining the current output duty ratio according to the current duty ratio, and performing steady-state judgment according to the absolute value and the current output duty ratio.
It should be noted that the steady state determination includes two states, one is a steady state, at this time, the output duty ratio is not changed, the circuit of the electromagnetic coil in the electromagnetic valve shows periodic fluctuation along with the opening and closing of the PWM signal, the current in the electromagnetic coil also shows periodic fluctuation, an average current steady state value can be obtained through mathematical integration filtering, the current value is used as an important duty ratio correction variable, and at this time, the state variable output is 0; the other is a transient state, the duty ratio is changed at the moment, the electromagnetic coil belongs to an inductance attribute component, even if the duty ratio is changed, the current in the electromagnetic coil cannot be instantly changed, the current after integral filtering is changed in the transient state, and the state variable output is 1 at the moment.
The principle of steady state determination is as follows: 1. calculating a difference value between the actual filtered sensor current and a current value corresponding to the current duty ratio, wherein the absolute value of the difference value exceeds a preset range and is 1, and the absolute value is 0 within the preset range; the preset range is set according to the actual condition of the electromagnetic valve; 2. and if the output current duty ratio is changed, the output current duty ratio is changed to 1 and is not changed to 0.
Step S203: and acquiring a duty ratio correction value according to a steady state judgment result and the steady state current value.
It should be understood that the judgment result can be further obtained based on the above principle.
Step S203, specifically including: and when the steady state judgment result is that the absolute value is larger than a preset absolute value, acquiring a temperature change value of the electromagnetic valve, determining a resistance change value of the electromagnetic valve according to the temperature change value, and acquiring the duty ratio correction value according to the resistance change value of the electromagnetic valve and the steady state current value.
It should be noted that, in the steady state, when the variable corresponding to the duty ratio output value condition 1 is 1 (the variable corresponding to the condition 2 may be 1 or 0), which is a transient transition condition, the temperature rise and the voltage correction of the solenoid valve maintain the previous values until the compensation value of the current condition is allowed to be calculated in the steady state.
Step S203, further includes: and when the steady state judgment result is that the absolute value is less than or equal to a preset absolute value and the current output duty ratio is not equal to the first duty ratio, starting timing and obtaining a first timing duration, when the first timing duration is equal to the preset delay filtering duration, obtaining a temperature change value of the electromagnetic valve, determining a resistance change value of the electromagnetic valve according to the temperature change value, and obtaining the duty ratio correction value according to the resistance change value of the electromagnetic valve and the steady state current value.
It should be noted that, when the variable corresponding to the condition 1 is 0 and the variable corresponding to the condition 2 is 0, the delay filtering time is entered, where the purpose of the delay filtering time is to obtain the steady-state current in the electromagnetic coil under the steady-state condition and the current temperature condition, and if the delay filtering time is greater than the preset delay filtering time, the electromagnetic coil enters the steady-state condition, and after the electromagnetic coil enters the steady-state condition, the correction duty ratio is obtained through mathematical calculation.
Further, after a state of the solenoid valve is stable, and the current in the solenoid valve reaches a relatively stable state, the calculation formula (3) of the duty ratio correction value is as follows:
and (4) obtaining a duty ratio correction value according to a formula (3), and further controlling the opening of the electromagnetic valve according to the corrected duty ratio.
In order to accurately control the opening of the electromagnetic valve, the embodiment of the invention obtains the filtering current under the condition of the steady duty ratio by measuring the current in the electromagnetic coil and carrying out integral filtering treatment, and calculates the value of the correction duty ratio according to the formula under the working condition of the steady duty ratio, thereby improving the control quality of the system.
Referring to fig. 5, fig. 5 is a block diagram showing a configuration of a proportional solenoid valve control apparatus according to a first embodiment of the present invention.
As shown in fig. 5, the apparatus according to the embodiment of the present invention includes:
the first control module 10 is configured to determine a first duty ratio according to a required opening degree of the solenoid valve, and control the opening degree of the proportional solenoid valve according to the first duty ratio.
It should be noted that the required opening degree of the electromagnetic valve can be determined according to the exhaust gas recirculation requirement of the engine, and the required opening degree of the electromagnetic valve is determined according to the existing control algorithm and the exhaust gas recirculation requirement. After the required opening degree of the electromagnetic valve is obtained, a electromagnetic valve opening degree-target duty ratio table can be queried according to the required opening degree of the electromagnetic valve to obtain the first duty ratio. The electromagnetic valve opening-target duty ratio table is obtained by calibrating corresponding parameters under experimental conditions. And inputting an electric signal corresponding to the first duty ratio into a duty ratio Pulse Width Modulation (PWM) generator to generate a PWM signal, wherein the PWM signal acts on an MOS (metal oxide semiconductor) tube of the electromagnetic valve driving circuit to enable the MOS tube to be conducted and closed, and the average current of the inductor of the flow electromagnetic valve is changed to control the flow electromagnetic valve so as to obtain the required opening degrees with different duty ratios.
And the correction module 20 is configured to obtain a current value of the proportional solenoid valve, and obtain a duty ratio correction value according to the current value.
It is easily understood that the first duty ratio is a desired duty ratio, and in a specific implementation, the resistance of the coil of the solenoid valve is increased due to the temperature rise, so that the current in the circuit is reduced under the same duty ratio, and the output current needs to be improved for the duty ratio correction. Meanwhile, voltage fluctuation can also be caused by power supply fluctuation of the electromagnetic valve, so that the interference caused by both resistance temperature rise and voltage must be considered at the same time to be output as the final duty ratio.
It should be noted that, after the state of the solenoid valve is stable, the current in the solenoid valve reaches a relatively stable state, the current value can be obtained, the resistance value change value of the equivalent resistor of the flow solenoid valve can be obtained according to the current temperature, and the duty ratio correction value is reversely deduced according to the current value and the resistance value change value.
And the second control module 20 is configured to determine a second duty ratio according to the first duty ratio and the duty ratio correction value, and perform opening control on the proportional solenoid valve according to the second duty ratio.
It is easy to understand that after the duty ratio correction value is obtained, the expected first duty ratio is corrected according to the duty ratio correction value to obtain a second duty ratio, and the second duty ratio is a corrected duty ratio.
Further, in order to obtain the corrected duty ratio, step S30 specifically includes: correcting the first duty ratio according to the duty ratio correction value to determine a second duty ratio; and controlling the opening of the proportional solenoid valve according to the second duty ratio.
It is easy to understand that, when the solenoid valve control is performed according to the second duty ratio, the correction is performed in real time if the temperature changes. In the present invention, the first duty ratio and the second duty ratio are only called for convenience of explanation, and do not represent the size of the two.
According to the embodiment of the invention, the opening degree of the electromagnetic valve is controlled through the corrected duty ratio by the device, so that the control precision of the electromagnetic valve is improved, the influence of temperature change on the electromagnetic valve is prevented, and excessive discharge of the engine caused by the position offset change of the electromagnetic valve is prevented.
Furthermore, an embodiment of the present invention further provides a storage medium having a proportional solenoid valve control program stored thereon, where the proportional solenoid valve control program is executed by a processor to perform the steps of the proportional solenoid valve control method as described above.
Since the storage medium adopts all technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.
It should be understood that the above is only an example, and the technical solution of the present invention is not limited in any way, and in a specific application, a person skilled in the art may set the technical solution as needed, and the present invention is not limited thereto.
It should be noted that the above-described work flows are only exemplary, and do not limit the scope of the present invention, and in practical applications, a person skilled in the art may select some or all of them to achieve the purpose of the solution of the embodiment according to actual needs, and the present invention is not limited herein.
In addition, the technical details that are not described in detail in this embodiment can be referred to the proportional solenoid valve control method provided in any embodiment of the present invention, and are not described herein again.
Further, it is to be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g. Read Only Memory (ROM)/RAM, magnetic disk, optical disk), and includes several instructions for enabling a terminal device (e.g. a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (7)
1. A method of controlling a proportional solenoid valve, the method comprising:
determining a first duty ratio according to the required opening degree of the electromagnetic valve, and controlling the opening degree of the proportional electromagnetic valve according to the first duty ratio;
acquiring the current value of the proportional solenoid valve, and performing integral filtering on the current value to acquire a steady-state current value;
acquiring a current duty ratio, and acquiring a current driving current value according to the current duty ratio;
acquiring an absolute value of a difference between the steady-state current value and the current driving current value, determining a current output duty ratio according to the current duty ratio, and performing steady-state judgment according to the absolute value and the current output duty ratio;
when the steady state judgment result is that the absolute value is larger than a preset absolute value, acquiring a temperature change value of the electromagnetic valve, determining a resistance change value of the electromagnetic valve according to the temperature change value, and acquiring the duty ratio correction value according to the resistance change value of the electromagnetic valve and the steady state current value;
when the steady state judgment result is that the absolute value is less than or equal to a preset absolute value and the current output duty ratio is not equal to the first duty ratio, starting timing and obtaining a first timing duration, when the first timing duration is equal to a preset delay filtering duration, obtaining a temperature change value of the electromagnetic valve, determining a resistance change value of the electromagnetic valve according to the temperature change value, and obtaining a duty ratio correction value according to the resistance change value of the electromagnetic valve and the steady state current value;
and determining a second duty ratio according to the first duty ratio and the duty ratio correction value, and controlling the opening of the proportional solenoid valve according to the second duty ratio.
2. The method for controlling a proportional solenoid valve according to claim 1, wherein the step of determining a second duty ratio according to the first duty ratio and the duty ratio correction value and controlling the opening degree of the proportional solenoid valve according to the second duty ratio specifically comprises:
correcting the first duty ratio according to the duty ratio correction value to determine a second duty ratio;
and controlling the opening of the proportional solenoid valve according to the second duty ratio.
3. The proportional solenoid valve control method according to any one of claims 1 or 2, wherein the step of determining a first duty ratio according to the solenoid valve required opening degree, and controlling the proportional solenoid valve opening degree according to the first duty ratio specifically includes:
determining a first duty ratio according to the required opening degree of the electromagnetic valve, and converting the first duty ratio into a first duty ratio control signal;
and outputting the first duty ratio control signal to an electromagnetic valve driving circuit so that the electromagnetic valve driving circuit controls the opening degree of the proportional electromagnetic valve.
4. The method for controlling a proportional solenoid valve according to claim 3, wherein the step of controlling the opening degree of the proportional solenoid valve according to the second duty ratio specifically includes:
and converting the second duty ratio into a second duty ratio control signal, and outputting the second duty ratio control signal to an electromagnetic valve driving circuit so that the electromagnetic valve driving circuit controls the opening degree of the proportional electromagnetic valve.
5. A proportional solenoid valve control apparatus, comprising:
the first control module is used for determining a first duty ratio according to the required opening of the electromagnetic valve and controlling the opening of the proportional electromagnetic valve according to the first duty ratio;
the correction module is used for acquiring the current value of the proportional solenoid valve and performing integral filtering on the current value to acquire a steady-state current value; acquiring a current duty ratio, and acquiring a current driving current value according to the current duty ratio; acquiring an absolute value of a difference between the steady-state current value and the current driving current value, determining a current output duty ratio according to the current duty ratio, and performing steady-state judgment according to the absolute value and the current output duty ratio; when the steady state judgment result is that the absolute value is larger than a preset absolute value, acquiring a temperature change value of the electromagnetic valve, determining a resistance change value of the electromagnetic valve according to the temperature change value, and acquiring the duty ratio correction value according to the resistance change value of the electromagnetic valve and the steady state current value; when the steady state judgment result is that the absolute value is less than or equal to a preset absolute value and the current output duty ratio is not equal to the first duty ratio, starting timing and obtaining a first timing duration, when the first timing duration is equal to a preset delay filtering duration, obtaining a temperature change value of the electromagnetic valve, determining a resistance change value of the electromagnetic valve according to the temperature change value, and obtaining a duty ratio correction value according to the resistance change value of the electromagnetic valve and the steady state current value;
and the second control module is used for determining a second duty ratio according to the first duty ratio and the duty ratio correction value and controlling the opening of the proportional solenoid valve according to the second duty ratio.
6. An electronic device, characterized in that the electronic device comprises: a memory, a processor and a proportional solenoid valve control program stored on the memory and executable on the processor, the proportional solenoid valve control program configured to implement the steps of the proportional solenoid valve control method of any one of claims 1 to 4.
7. A storage medium, characterized in that the storage medium has stored thereon a proportional solenoid valve control program that, when executed by a processor, implements the steps of the proportional solenoid valve control method according to any one of claims 1 to 4.
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| CN113431947B (en) * | 2021-06-10 | 2023-08-04 | 西北机电工程研究所 | MOSFET-based energy-saving drive circuit for electromagnetic reversing valve |
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| CN105179671B (en) * | 2015-09-14 | 2018-01-19 | 中国北方车辆研究所 | A kind of proportion magnetic valve temperature compensation based on current constant control |
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