CN109116229B - Electromagnetic valve working state detection system - Google Patents
Electromagnetic valve working state detection system Download PDFInfo
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- CN109116229B CN109116229B CN201811233280.5A CN201811233280A CN109116229B CN 109116229 B CN109116229 B CN 109116229B CN 201811233280 A CN201811233280 A CN 201811233280A CN 109116229 B CN109116229 B CN 109116229B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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Abstract
The invention discloses a system for detecting the working state of an electromagnetic valve, which comprises a power supply module, a sampling module and a control module, wherein the control module is respectively connected with the power supply module and the sampling module in series; the sampling module is used for collecting the output voltage of the electromagnetic valve to be detected; the control module is used for carrying out pulse control on the power supply module and judging the working state of the electromagnetic valve to be detected according to the sampling signal obtained by the sampling module. The system for detecting the working state of the electromagnetic valve can effectively detect various working states of the electromagnetic valve, has a simple structure, and does not need to carry out special improvement or design on the electromagnetic valve.
Description
Technical Field
The invention relates to the field of industrial equipment state detection, in particular to a system for detecting the working state of an electromagnetic valve.
Background
One of the conventional methods for detecting the working state of the solenoid valve is to use a magnetic actuating mechanism to attract the reed pipe when the solenoid valve is closed, so as to indicate that the solenoid valve is closed. The method can only simply detect the opening and closing state of the electromagnetic valve, and can not completely detect other working states of the electromagnetic valve. Meanwhile, the detection method needs to be provided with a special external signal wire, so that the number of the wiring on the electromagnetic valve is increased, and the detection cost of the working state of the electromagnetic valve is improved.
Disclosure of Invention
Based on the above defects in the prior art, embodiments of the present invention provide a system for detecting operating states of an electromagnetic valve, which has a simple structure and can detect multiple operating states of the electromagnetic valve.
The present invention can be implemented in numerous ways, including as a method, system, device, apparatus, or computer readable medium in which several embodiments of the invention are discussed below.
The technical scheme of the invention is as follows:
a system for detecting the working state of an electromagnetic valve comprises a power supply module, a sampling module and a control module, wherein the control module is respectively connected with the power supply module and the sampling module in series, the power supply module and the sampling module are respectively and correspondingly connected with two ends of the electromagnetic valve to be detected,
the power supply module is used for outputting a power supply signal with a fixed pulse width to the electromagnetic valve to be detected;
the sampling module is used for collecting the output voltage of the electromagnetic valve to be detected;
the control module is used for carrying out pulse control on the power supply module and judging the working state of the electromagnetic valve to be detected according to the sampling signal obtained by the sampling module.
In the above technical solution, the control module is preferably a single chip microcomputer, and controls the power supply module to output a power supply signal with a fixed pulse width, and the power supply signal with the fixed pulse width passes through the solenoid valve to be detected, and is received and processed by the sampling module into a sampling signal recognizable by the control module; when the electromagnetic valve is in different working states, the coil inductance of the electromagnetic valve can be correspondingly changed, so that the sampling signal received by the sampling module is indirectly influenced; and the control module judges the working state of the electromagnetic valve to be detected according to the sampling signals in different forms. The electromagnetic valve working state detection system can effectively detect various working states of the electromagnetic valve, has a simple structure, and does not need to carry out special improvement or design on the electromagnetic valve.
Further, the control module outputs a control pulse to the power module to realize pulse on/off control of the power module, wherein the control pulse is a fixed-width pulse.
Preferably, the pulse width of the control pulse is 100-9000 microseconds. The pulse width of the control pulse is determined according to the inductance of the solenoid valve coil to be detected and the maximum sampling voltage value of the sampling module.
Further, the sampling module comprises a sampling resistor and an analog-to-digital converter; the sampling resistor is connected with the electromagnetic valve to be detected, and the analog-to-digital converter is connected with the control module.
Preferably, the resistance value of the sampling resistor is 0.1-10 ohms. The normal starting of the electromagnetic valve to be detected is influenced by the overlarge resistance value of the sampling resistor, so the resistance value of the sampling resistor should be controlled, and the normal starting of the electromagnetic valve is not influenced. In addition, the resistance of the sampling resistor also affects the pulse width of the control pulse.
Further, the power supply module comprises a direct current power supply and a switch control unit; the control module controls the direct current power supply to output a fixed pulse width power supply signal through the switch control unit. The control module realizes pulse on/off control of the direct current power supply through the switch control unit.
Further, the working states of the electromagnetic valve are closing of the electromagnetic valve, opening of the electromagnetic valve, disconnection of an electromagnetic valve control line and short circuit of the electromagnetic valve control line.
Preferably, when the control module outputs a control pulse to the power module and the sampling signal obtained by the sampling module is zero, the working state of the electromagnetic valve to be detected is judged to be the open circuit of the electromagnetic valve control line.
Because the solenoid valve control line is broken, the fixed pulse power supply signal that power module sent can't pass through solenoid valve coil and transmit to the sampling module, so, when the solenoid valve control line was broken, the sampling signal that sampling module obtained should be zero.
Preferably, when the control module outputs a control pulse to the power module, and the pulse width of the sampling signal obtained by the sampling module is the same as the pulse width of the control pulse output by the control module, it is determined that the working state of the electromagnetic valve to be detected is an electromagnetic valve control line short circuit.
Because the control line of the electromagnetic valve is short-circuited, the power supply signal with the fixed pulse width output by the power supply module does not pass through the coil of the electromagnetic valve but is directly transmitted to the sampling module through the short-circuited part, the front and rear inductances of the sampling module are not changed, and the pulse width of the power supply signal is not influenced, so when the control line of the electromagnetic valve is short-circuited, the pulse width of the sampling signal obtained by the sampling module is the same as the pulse width of the power supply signal with the fixed pulse width output by the power supply module.
Preferably, when the control module outputs a control pulse to the power module, and the sampling signal obtained by the sampling module is not zero and the pulse width of the sampling signal is different from the pulse width output by the control module, it is determined that the working state of the electromagnetic valve to be detected is the opening/closing of the electromagnetic valve.
When the electromagnetic valve is opened or closed, the inductance of the coil of the electromagnetic valve can be changed, after a fixed pulse width power supply signal output by the power supply module passes through the inductance of the electromagnetic valve coil, because the current of the inductance can not change suddenly, the inductance can inhibit the current, and under the action of control pulses with the same width, the inhibition capacities of different inductance values to the current are different, so that sampling signals obtained by the sampling module through the electromagnetic valve coil can be different, and the working state of the electromagnetic valve to be detected can be judged to be opened/closed through different sampling signals. The sampling signals corresponding to the opening/closing of the electromagnetic valve are influenced by the electromagnetic valve coil, and for the actual specific electromagnetic valve coil, the states of the sampling signals corresponding to the opening/closing of the electromagnetic valve can be determined through a pre-test.
The invention can realize the following positive and beneficial technical effects:
the system for detecting the working state of the electromagnetic valve can effectively detect various working states of the electromagnetic valve, has a simple structure, and does not need to carry out special improvement or design on the electromagnetic valve.
Other aspects and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the invention.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a system for detecting an operating state of an electromagnetic valve according to an embodiment of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The defects of the prior art are as follows: the existing electromagnetic valve detection method can only simply detect the opening and closing state of the electromagnetic valve, and can not completely detect other working states of the electromagnetic valve. Meanwhile, the detection method needs to be provided with a special external signal wire, so that the number of the wiring on the electromagnetic valve is increased, and the detection cost of the working state of the electromagnetic valve is improved.
The technical problems to be solved by the invention are as follows: the solenoid valve working state detection system can effectively detect various working states of the solenoid valve, has a simple structure, and does not need to carry out special improvement or design on the solenoid valve.
The basic implementation mode is as follows:
a system for detecting the working state of an electromagnetic valve is shown in figure 1 and comprises a power supply module, a sampling module and a control module, wherein the control module is respectively connected with the power supply module and the sampling module in series, the power supply module and the sampling module are respectively and correspondingly connected with two ends of the electromagnetic valve to be detected,
the power supply module is used for outputting a power supply signal with a fixed pulse width to the electromagnetic valve to be detected;
the sampling module is used for collecting the output voltage of the electromagnetic valve to be detected;
the control module is used for carrying out pulse control on the power supply module and judging the working state of the electromagnetic valve to be detected according to the sampling signal obtained by the sampling module.
In the above technical solution, the control module is preferably a single chip microcomputer, and controls the power supply module to output a power supply signal with a fixed pulse width, and the power supply signal with the fixed pulse width passes through the solenoid valve to be detected, and is received and processed by the sampling module into a sampling signal recognizable by the control module; when the electromagnetic valve is in different working states, the coil inductance of the electromagnetic valve can be correspondingly changed, so that the sampling signal received by the sampling module is indirectly influenced; and the control module judges and outputs the working state of the electromagnetic valve to be detected according to the sampling signals in different forms.
The control module outputs control pulses to the power supply module to realize pulse on/off control of the power supply module, wherein the control pulses are fixed-width pulses. After the control pulse acts on the power supply module, a pulse power supply signal with a fixed pulse width is formed in the power supply module and is output to the electromagnetic valve to be detected, and the pulse width of the power supply signal with the fixed pulse width is the same as that of the control pulse output by the control module. The pulse width of the control pulse is 100-9000 microseconds. The pulse width of the control pulse is determined according to the inductance of the solenoid valve coil to be detected and the maximum sampling voltage value of the sampling module. Illustratively, the pulse width of the control pulse may be 500 microseconds, 900 microseconds, 2000 microseconds, 5000 microseconds, or the like.
The sampling module comprises a sampling resistor and an analog-to-digital converter; the sampling resistor is connected with the electromagnetic valve to be detected, and the analog-to-digital converter is connected with the control module. After a power supply signal with a fixed pulse width output by the power supply module passes through a coil of the electromagnetic valve, pulse voltage with a certain amplitude is generated on the sampling resistor, and the voltage is sampled and processed by the analog-to-digital converter and is transmitted to the control module.
The resistance value of the sampling resistor is 0.1-10 ohms. The normal starting of the electromagnetic valve to be detected is influenced by the overlarge resistance value of the sampling resistor, so the resistance value of the sampling resistor should be controlled, and the normal starting of the electromagnetic valve is not influenced. In addition, the resistance of the sampling resistor also affects the pulse width of the control pulse. Illustratively, the resistance value of the sampling resistor can be 2 ohms, 5 ohms, 8 ohms, or the like.
The power supply module comprises a direct current power supply and a switch control unit; the control module controls the direct current power supply to output a fixed pulse width power supply signal through the switch control unit. The control module realizes pulse on/off control of the direct current power supply through the switch control unit. When the switch control unit is started, the direct current power supply is switched on, the power supply module outputs a power supply signal with a fixed pulse width, and the pulse width of the power supply signal with the fixed pulse width is the same as that of the control pulse output by the control module.
The direct current power supply mainly provides the voltage required by the working state detection system of the electromagnetic valve, and the voltage is generally 12V or 24V.
The working states of the electromagnetic valve are closing of the electromagnetic valve, opening of the electromagnetic valve, disconnection of an electromagnetic valve control line and short circuit of the electromagnetic valve control line. The detection principle of various working states is as follows:
1) when the control module outputs a control pulse to the power supply module and the sampling signal obtained by the sampling module is zero, judging that the working state of the electromagnetic valve to be detected is the open circuit of the electromagnetic valve control line;
because the solenoid valve control line is broken, the fixed pulse power supply signal that power module sent can't pass through solenoid valve coil and transmit to the sampling module, so, when the solenoid valve control line was broken, the sampling signal that sampling module obtained should be zero.
2) When the control module outputs control pulses to the power supply module, and the pulse width of a sampling signal obtained by the sampling module is the same as that of the control pulses output by the control module, judging that the working state of the electromagnetic valve to be detected is short-circuit of a control line of the electromagnetic valve;
because the control line of the electromagnetic valve is short-circuited, the power supply signal with the fixed pulse width output by the power supply module does not pass through the coil of the electromagnetic valve but is directly transmitted to the sampling module through the short-circuited part, the front and rear inductances of the sampling module are not changed, and the pulse width of the power supply signal is not influenced, so when the control line of the electromagnetic valve is short-circuited, the pulse width of the sampling signal obtained by the sampling module is the same as the pulse width of the power supply signal with the fixed pulse width output by the power supply module.
3) When the control module outputs control pulses to the power module, the sampling signal obtained by the sampling module is not zero and the pulse width of the sampling signal is different from the pulse width output by the control module, judging that the working state of the electromagnetic valve to be detected is the opening/closing of the electromagnetic valve;
when the electromagnetic valve is opened or closed, the inductance of the coil of the electromagnetic valve can be changed, after a fixed pulse width power supply signal output by the power supply module passes through the inductance of the electromagnetic valve coil, because the current of the inductance can not change suddenly, the inductance can inhibit the current, and under the action of control pulses with the same width, the inhibition capacities of different inductance values to the current are different, so that sampling signals obtained by the sampling module through the electromagnetic valve coil can be different, and the working state of the electromagnetic valve to be detected can be judged to be opened/closed through different sampling signals. The sampling signals corresponding to the opening/closing of the electromagnetic valve are influenced by the electromagnetic valve coil, and for the actual specific electromagnetic valve coil, the states of the sampling signals corresponding to the opening/closing of the electromagnetic valve can be determined through a pre-test.
The different aspects, embodiments, implementations or features of the invention can be used alone or in any combination.
The invention is preferably implemented by software, but can also be implemented in hardware or a combination of hardware and software. The invention can also be embodied as computer readable code on a computer readable medium. The computer readable medium is any data storage device that can store data which can thereafter be read by a computer system. Examples of computer readable media include: read-only memory, random access memory, CD-ROM, DVD, magnetic tape, optical data storage devices, and carrier waves. The computer readable medium can also be distributed over network coupled computer systems so that the computer readable code is stored and executed in a distributed fashion.
The advantages of the present invention are numerous. Different aspects, embodiments or implementations may yield one or more of the following advantages. One advantage of the present invention is: the system for detecting the working state of the electromagnetic valve can effectively detect various working states of the electromagnetic valve at the same time. Another advantage of the present invention is: the system for detecting the working state of the electromagnetic valve has a simple structure, and does not need to carry out special improvement or design on the electromagnetic valve.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (6)
1. A system for detecting the working state of an electromagnetic valve is characterized by comprising a power supply module, a sampling module and a control module, wherein the control module is respectively connected with the power supply module and the sampling module in series, the power supply module and the sampling module are respectively and correspondingly connected with two ends of the electromagnetic valve to be detected,
the power supply module is used for outputting a power supply signal with a fixed pulse width to the electromagnetic valve to be detected;
the sampling module is used for collecting the output voltage of the electromagnetic valve to be detected;
the control module is used for carrying out pulse control on the power supply module and judging the working state of the electromagnetic valve to be detected according to the sampling signal obtained by the sampling module;
the working states of the electromagnetic valve comprise closing of the electromagnetic valve, opening of the electromagnetic valve, disconnection of an electromagnetic valve control line and short circuit of the electromagnetic valve control line;
when the control module outputs a control pulse to the power supply module and the sampling signal obtained by the sampling module is zero, judging that the working state of the electromagnetic valve to be detected is the open circuit of the electromagnetic valve control line;
when the control module outputs control pulses to the power supply module, and the pulse width of a sampling signal obtained by the sampling module is the same as that of the control pulses output by the control module, judging that the working state of the electromagnetic valve to be detected is short-circuit of a control line of the electromagnetic valve;
when the control module outputs control pulses to the power supply module, the sampling signal obtained by the sampling module is not zero and the pulse width of the sampling signal is different from the pulse width output by the control module, the working state of the electromagnetic valve to be detected is judged to be the opening/closing of the electromagnetic valve.
2. The system for detecting the working state of the electromagnetic valve according to claim 1, wherein the control module outputs a control pulse to the power module to realize pulse on/off control of the power module, and the control pulse is a fixed-width pulse.
3. The system for detecting the working state of the electromagnetic valve according to claim 2, wherein the pulse width of the control pulse is 100-9000 microseconds.
4. The system for detecting the working state of the electromagnetic valve according to claim 1, wherein the sampling module comprises a sampling resistor and an analog-to-digital converter; the sampling resistor is connected with the electromagnetic valve to be detected, and the analog-to-digital converter is connected with the control module.
5. The system for detecting the working state of the electromagnetic valve according to claim 4, wherein the resistance value of the sampling resistor is 0.1-10 ohms.
6. The system for detecting the working state of the electromagnetic valve according to claim 1, wherein the power supply module comprises a direct current power supply and a switch control unit; the control module controls the direct current power supply to output a fixed pulse width power supply signal through the switch control unit.
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| CN113049890A (en) * | 2019-12-27 | 2021-06-29 | 盾安环境技术有限公司 | Fault detection circuit and method for solenoid valve coil and solenoid valve coil device |
| CN113189421A (en) * | 2021-04-21 | 2021-07-30 | 郑州海为电子科技有限公司 | Electromagnetic valve detection device and detection method based on electromagnetic drive validity detection |
| CN113848468A (en) * | 2021-09-22 | 2021-12-28 | 华帝股份有限公司 | Electromagnetic valve state detection method based on unit impulse function and electromagnetic valve |
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| US4932246A (en) * | 1989-02-22 | 1990-06-12 | Motorola, Inc. | Diagnostic fault test system and circuit |
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| CN1554954A (en) * | 2003-12-19 | 2004-12-15 | 中国科学院长春光学精密机械与物理研 | Detecting structure and method for relaying type relay open and close state |
| JP2008232871A (en) * | 2007-03-22 | 2008-10-02 | Hitachi Ltd | Circuit abnormality determining apparatus and circuit abnormality determining method |
| CN101975301B (en) * | 2010-09-30 | 2011-11-30 | 北京理工大学 | FPGA-based solenoid valve driving module |
| CN102570377B (en) * | 2010-12-07 | 2016-06-08 | 中国第一汽车集团公司无锡油泵油嘴研究所 | Load faulty diagnosis detecting method and device |
| CN102410122A (en) * | 2011-10-25 | 2012-04-11 | 浙江大学 | Fault diagnosis device and method for vehicle solenoid valve |
| CN102411114B (en) * | 2011-11-30 | 2014-07-23 | 北京市三一重机有限公司 | Device and method for automatically detecting short circuit and disconnection of wire harnesses of rotary drilling rig |
| CN102854425A (en) * | 2012-09-29 | 2013-01-02 | 北京博润宏达科技发展有限公司 | High-speed electromagnetic valve performance detection system |
| CN106153086B (en) * | 2016-07-27 | 2018-08-28 | 河北秦汉电子科技有限公司 | A kind of electromagnetic valve work condition checkout gear |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US4932246A (en) * | 1989-02-22 | 1990-06-12 | Motorola, Inc. | Diagnostic fault test system and circuit |
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