CN101956857A - Control and protection self-checking circuit of vehicle electromagnetic valve - Google Patents
Control and protection self-checking circuit of vehicle electromagnetic valve Download PDFInfo
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- CN101956857A CN101956857A CN 201010288303 CN201010288303A CN101956857A CN 101956857 A CN101956857 A CN 101956857A CN 201010288303 CN201010288303 CN 201010288303 CN 201010288303 A CN201010288303 A CN 201010288303A CN 101956857 A CN101956857 A CN 101956857A
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Abstract
The invention discloses a control and protection self-checking circuit of a vehicle electromagnetic valve, comprising a single chip microcomputer and an electromagnetic valve, wherein the single chip microcomputer is provided with two control ends and two feedback ends, the higher edge control end is communicated with a higher edge connector through a higher edge control circuit, the lower edge control end is communicated with a lower edge connector through a lower edge control circuit, the electromagnetic valve is installed between the higher edge connector and the lower edge connector, a power diode is connected between the higher edge connector and the lower edge connector in a crossing way, a cathode of the power diode is connected with the higher edge connector, an anode of the power diode is connected with the lower edge connector, and a higher edge feedback end and a lower edge feedback end are respectively communicated with the higher edge connector and the lower edge connector through a higher edge feedback circuit and a lower edge feedback circuit. The invention rapidly eliminates back electromotive force of the electromagnetic valve through the power diode which is connected in parallel with the electromagnetic valve, ensures that other components are not impacted, judges whether a working state of the electromagnetic valve and a control switch of the electromagnetic valve are normal or not through voltage values of two paths of control signals and two paths of feedback signals and tracks a concrete work state of the electromagnetic valve, thereby greatly lowering the risk of system failure.
Description
Technical field
The present invention relates to a kind of automobile electrical appliances control system, specifically belong to a kind of control protection self-checking circuit of automobile electromagnetic valve.
Background technique
Present automobile more and more uses solenoid valve to control each component, general control mode is to export the control signal of solenoid valve (as pulse-width signal by a single-chip microcomputer, be pwm signal), thus open and close the purpose that reaches control electromagnetic valve by a power supply chip of control signal control.Because solenoid valve is a perceptual device, the quickening of and electromagnetic valve switch frequency increasing along with the inductance value of the increasing of solenoid valve number, single solenoid valve, cause the counterelectromotive force of solenoid valve increasing and heating value is increasing, and then make solenoid valve be easy to generate the open circuit or short circuit phenomenon with and control circuit fragile under very big counterelectromotive force effect, and owing to can't in time eliminate counterelectromotive force, make that the actual act and the control signal of solenoid valve are inconsistent, thereby cause solenoid valve to produce malfunction; And, solenoid valve control circuit at present commonly used can't detect each element normally whether, cause the instability of whole system control even the damage of control system electronic parts and components.
Summary of the invention
The present invention seeks to: the control protection self-checking circuit that a kind of automobile electromagnetic valve is provided; this circuit can in time be eliminated the bigger counterelectromotive force that solenoid valve produces; in time diagnose the quality of each components and parts, open circuit or the short circuit phenomenon that solenoid valve occurs; guarantee the normal operation of solenoid valve, significantly improve the reliability of controller and the controllability of vehicle.
Technological scheme of the present invention is: a kind of control protection self-checking circuit of automobile electromagnetic valve, comprise the single-chip microcomputer and the solenoid valve that produce control signal, described single-chip microcomputer is provided with flash control end, low limit control end, flash feedback end and low limit feedback end, described flash control end is communicated with the high edge connector of solenoid valve by solenoid valve flash control circuit, low limit control end is communicated with the low edge connector of solenoid valve by the low limit of solenoid valve control circuit, between the low edge connector of high edge connector of described solenoid valve and solenoid valve solenoid valve is housed; Cross-over connection has the unidirectional breakover element of eliminating solenoid valve counterelectromotive force energy between the low edge connector of high edge connector of described solenoid valve and solenoid valve; The flash feedback end of described single-chip microcomputer is communicated with the high edge connector of solenoid valve by solenoid valve flash feeder loop, and low limit feedback end is communicated with the low edge connector of solenoid valve by the low limit of solenoid valve feeder loop.
The further technological scheme of the present invention is: a kind of control protection self-checking circuit of automobile electromagnetic valve, comprise the single-chip microcomputer and the solenoid valve that produce control signal, described single-chip microcomputer is provided with flash control end, low limit control end, flash feedback end and low limit feedback end, described flash control end is communicated with the high edge connector of solenoid valve by solenoid valve flash control circuit, low limit control end is communicated with the low edge connector of solenoid valve by the low limit of solenoid valve control circuit, between the low edge connector of high edge connector of described solenoid valve and solenoid valve solenoid valve is housed; Cross-over connection has the unidirectional breakover element of eliminating solenoid valve counterelectromotive force energy between the low edge connector of high edge connector of described solenoid valve and solenoid valve; The flash feedback end of described single-chip microcomputer is communicated with the high edge connector of solenoid valve by solenoid valve flash feeder loop, and low limit feedback end is communicated with the low edge connector of solenoid valve by the low limit of solenoid valve feeder loop; Described unidirectional breakover element is a power diode, and the negative electrode of described power diode connects the high edge connector of solenoid valve, and anode connects the low edge connector of solenoid valve; Described solenoid valve flash control circuit comprises flash wave filter and solenoid valve flash switch, the flash control signal of described flash control end output inputs to solenoid valve flash switch through the flash wave filter and opens and closes to control it, and the output terminal of described solenoid valve flash switch and the high edge connector of solenoid valve join; The low limit of described solenoid valve control circuit comprises low limit wave filter and solenoid valve lower edge switch, the low limit control signal of described low limit control end output inputs to the solenoid valve lower edge switch through low limit wave filter and opens and closes to control it, and the low edge connector of the output terminal of described solenoid valve lower edge switch and solenoid valve joins; Described solenoid valve flash feeder loop comprises first resistance that links to each other with the high edge connector input end of solenoid valve, connect with first resistance and second resistance of ground connection, first electric capacity in parallel with second resistance; The low limit of described solenoid valve feeder loop comprises the 3rd resistance that links to each other with the low edge connector input end of solenoid valve, the 4th resistance of the ground connection also connected with the 3rd resistance, second electric capacity in parallel with the 4th resistance; Cross-over connection has the 5th resistance that detects the solenoid valve state between the low edge connector of high edge connector of described solenoid valve and solenoid valve.
The more detailed technological scheme of the present invention is: a kind of control protection self-checking circuit of automobile electromagnetic valve, comprise the single-chip microcomputer and the solenoid valve that produce control signal, described single-chip microcomputer is provided with flash control end, low limit control end, flash feedback end and low limit feedback end, described flash control end is communicated with the high edge connector of solenoid valve by solenoid valve flash control circuit, low limit control end is communicated with the low edge connector of solenoid valve by the low limit of solenoid valve control circuit, between the low edge connector of high edge connector of described solenoid valve and solenoid valve solenoid valve is housed; Cross-over connection has the unidirectional breakover element of eliminating solenoid valve counterelectromotive force energy between the low edge connector of high edge connector of described solenoid valve and solenoid valve; The flash feedback end of described single-chip microcomputer is communicated with the high edge connector of solenoid valve by solenoid valve flash feeder loop, and low limit feedback end is communicated with the low edge connector of solenoid valve by the low limit of solenoid valve feeder loop; Described unidirectional breakover element is a power diode, and the negative electrode of described power diode connects the high edge connector of solenoid valve, and anode connects the low edge connector of solenoid valve; Described solenoid valve flash control circuit comprises flash wave filter and solenoid valve flash switch, the flash control signal of described flash control end output inputs to solenoid valve flash switch through the flash wave filter and opens and closes to control it, and the output terminal of described solenoid valve flash switch and the high edge connector of solenoid valve join; The low limit of described solenoid valve control circuit comprises low limit wave filter and solenoid valve lower edge switch, the low limit control signal of described low limit control end output inputs to the solenoid valve lower edge switch through low limit wave filter and opens and closes to control it, and the low edge connector of the output terminal of described solenoid valve lower edge switch and solenoid valve joins; Described solenoid valve flash feeder loop comprises first resistance that links to each other with the high edge connector input end of solenoid valve, connect with first resistance and second resistance of ground connection, first electric capacity in parallel with second resistance; The low limit of described solenoid valve feeder loop comprises the 3rd resistance that links to each other with the low edge connector input end of solenoid valve, the 4th resistance of the ground connection also connected with the 3rd resistance, second electric capacity in parallel with the 4th resistance; Cross-over connection has the 5th resistance that detects the solenoid valve state between the low edge connector of high edge connector of described solenoid valve and solenoid valve; Be connected with level switch module between described low limit wave filter and the solenoid valve lower edge switch; Described flash wave filter and low limit wave filter are the RC mode filter.
Advantage of the present invention is:
Among the present invention at the solenoid valve two ends common power diode in parallel, when solenoid valve by opening when change to close producing bigger counterelectromotive force, the direction of this counterelectromotive force is consistent with the conducting direction of power diode, the counterelectromotive force energy of solenoid valve will discharge by the form of power diode with heat like this, and the on resistance of the resistance of solenoid valve and power diode is all very little, be similar to short circuit, so counterelectromotive force can discharge with very fast speed, so just guaranteed can not impact to other components and parts;
2. the present invention has connected several common electronic components and has carried out self diagnosis in control circuit, the two path control signal that can send by single-chip microcomputer and the two-way feedback signal that receives judge the working state of solenoid valve and electromagnetic valve switch normally whether, implement fairly simple, cost is lower, at any time follow the tracks of the concrete working state of solenoid valve, greatly reduced the risk of thrashing.
Description of drawings
Below in conjunction with drawings and Examples the present invention is further described:
Fig. 1 is a schematic diagram of the present invention;
Fig. 2 is a circuit diagram of the present invention.
Wherein: 1 is single-chip microcomputer; 2 is solenoid valve flash switch; 3 is the high edge connector of solenoid valve; 4 is the flash control end; 5 is the solenoid valve lower edge switch; 6 are the low edge connector of solenoid valve; 7 are low limit control end; 8 is power diode; 9 is the flash feedback end; 10 are low limit feedback end; 11 is the flash wave filter; 12 are low limit wave filter; 13 is level switch module; 14 is solenoid valve flash feeder loop; 15 are the low limit of solenoid valve feeder loop.
Embodiment
Embodiment: a kind of control protection self-checking circuit of automobile electromagnetic valve; as shown in Figure 1 and Figure 2; comprise the single-chip microcomputer 1 and the solenoid valve that produce control signal; described single-chip microcomputer 1 is provided with flash control end 4, low limit control end 7, flash feedback end 9 and low limit feedback end 10; described flash control end 4 is communicated with the high edge connector 3 of solenoid valve by solenoid valve flash control circuit; low limit control end 7 is communicated with the low edge connector 6 of solenoid valve by the low limit of solenoid valve control circuit, between the low edge connector 6 of high edge connector 3 of described solenoid valve and solenoid valve solenoid valve is housed.The flash feedback end 9 of described single-chip microcomputer 1 is communicated with the high edge connector 3 of solenoid valve by solenoid valve flash feeder loop 14, and low limit feedback end 10 is communicated with the low edge connector 6 of solenoid valve by the low limit of solenoid valve feeder loop 15.
Cross-over connection has the power diode 8 of eliminating solenoid valve counterelectromotive force energy between the low edge connector 6 of high edge connector 3 of described solenoid valve and solenoid valve, and the negative electrode of described power diode 8 connects the high edge connector 3 of solenoid valve, and anode connects the low edge connector 6 of solenoid valve.
Described solenoid valve flash control circuit comprises flash wave filter 11 and solenoid valve flash switch 2, the flash control signal of described flash control end 4 outputs inputs to solenoid valve flash switch 2 through flash wave filter 11 and opens and closes to control it, and the high edge connector 3 of the output terminal of described solenoid valve flash switch 2 and solenoid valve joins; The low limit of described solenoid valve control circuit comprises low limit wave filter 12 and solenoid valve lower edge switch 5, the low limit control signal of described low limit control end 7 outputs inputs to solenoid valve lower edge switch 5 through low limit wave filter 12 and opens and closes to control it, and the low edge connector 6 of the output terminal of described solenoid valve lower edge switch 5 and solenoid valve joins.Described flash wave filter 11 and low limit wave filter 12 are the RC mode filter, described flash wave filter 11 is made up of the 6th resistance R 1 and the 3rd capacitor C 2, low limit wave filter is made up of 2 the 4th capacitor C 3 of the 7th resistance R, described flash control end 4 and low limit control end 9 pass through two undesired signals in the wave filter removal control signal after sending control signal, to guarantee the precision maneuver of solenoid valve flash switch 2 and solenoid valve lower edge switch 5.When the flash control signal that described flash control end 4 sends was high level, solenoid valve flash switch 2 was opened; When the flash control signal was low level, solenoid valve flash switch 2 cut out; When the low limit control signal that described low limit control end 7 sends was high level, solenoid valve lower edge switch 5 was opened; When low limit control signal was low level, solenoid valve lower edge switch 5 was closed.
Described solenoid valve flash feeder loop 14 comprises first resistance R 6 that links to each other with high edge connector 3 input ends of solenoid valve, connect with first resistance R 6 and second resistance R 8 of ground connection, first capacitor C 7 in parallel with second resistance R 8; The low limit of described solenoid valve feeder loop 15 comprises the 3rd resistance R 13 that links to each other with low edge connector 6 input ends of solenoid valve, the 4th resistance R 15 of the ground connection also connected with the 3rd resistance R 13, second capacitor C 14 in parallel with the 4th resistance R 15; Cross-over connection has the 5th resistance R 4 that detects the solenoid valve state between the low edge connector 6 of high edge connector 3 of described solenoid valve and solenoid valve.Described first capacitor C 7 and second capacitor C, the 14 main undesired signals of eliminating in the feedback signal.
Be connected with level switch module 13 between described low limit wave filter 11 and the solenoid valve lower edge switch 5, described level switch module 13 is mainly used to carry the level value of high-low side control signal.Described power diode 8 can replace with other unidirectional breakover element, as metal-oxide-semiconductor, also can play the effect of eliminating the solenoid valve inverse electromotive force.
The working principle of this circuit:
When system needs solenoid valve work, the flash control end 4 of single-chip microcomputer 1 sends the flash control signal of high level, thereby make solenoid valve flash switch 2 open, be that power of electromagnetic valve U+ communicates with the high edge connector 3 of solenoid valve, the flash feedback end 9 of single-chip microcomputer 1 detects the voltage condition of solenoid valve flash by the flash feedback signal simultaneously.In the flash control signal is that high level and low limit control signal are low level, and promptly under the situation that solenoid valve lower edge switch 5 is not opened, the voltage of normal flash feedback signal is U
High={ R8/ (R8+R6) } * U+, and the voltage of low normally limit feedback signal is U
Low={ R15/ (R13+R15) } * U+ if the voltage of flash feedback signal is 0, illustrates that then solenoid valve flash switch 2 damages, and does not consider the situation of solenoid valve shorted to earth; If the voltage U of low limit feedback signal
Low={ R15/ (R4+R13+R15) } * U+ then illustrates the solenoid valve open circuit.
After solenoid valve flash switch 2 was opened, solenoid valve wanted proper functioning, also needed to open solenoid valve lower edge switch 5, and solenoid valve could form current paths like this, carried out proper functioning.The low limit control end 7 of single-chip microcomputer 1 sends the low limit control signal of high level, can reliably open solenoid valve lower edge switch 5 needed voltages through becoming after the level switch module 13, and then open solenoid valve lower edge switch 5, be that the low edge connector 6 of solenoid valve communicates with ground wire, thereby make the flash of solenoid valve and low limit form voltage difference, electric current forms path, makes solenoid valve work, and the low limit feedback end 10 of single-chip microcomputer detects the working condition of solenoid valve by low limit feedback signal simultaneously.In flash feedback signal and low limit feedback signal all is under the normal condition of high level, the voltage U of flash feedback signal
High={ R8/ (R8+R6) } * U+, the voltage of low limit feedback signal is 0, if the voltage U of low limit feedback signal
Low={ R15/ (R13+R15) } * U+ illustrates that then solenoid valve lower edge switch 5 damages, if the voltage of flash feedback signal is 0, and the voltage of low limit feedback signal is 0, and the solenoid valve short circuit then is described.
When solenoid valve flash switch 2 is opened, when single-chip microcomputer 1 sends corresponding pwm signal and comes control electromagnetic valve lower edge switch 5 according to the requirement of system, the solenoid valve action that will ceaselessly open and close like this, and switching frequency may reach 1KHz, this moment, solenoid valve will constantly produce the very big counterelectromotive force of voltage, this counterelectromotive force can cause very big impact to The whole control system, even damage other electronic parts and components, and the words of not eliminating counterelectromotive force can influence the control of solenoid valve, thereby cause the misoperation of actuator, and then influence the control of vehicle, and increased power diode 8 with the solenoid valve parallel connection, will be at the extremely short time counterelectromotive force of releasing, and then eliminate the influence of counterelectromotive force vehicle control.And two feeder loops that increase is made of resistance capacitance, then allow single-chip microcomputer know the working state of solenoid valve at any time according to the voltage of the high-low level of two control signals of solenoid valve and two-way feeder loop, and in startup self-detection, just can judge the situation of solenoid valve, SCM system is done further action according to the situation of concrete solenoid valve, thus the situation of having avoided solenoid valve to go wrong; System is also carrying out control corresponding to solenoid valve, and such as the situation that the solenoid valve short circuit occurred, also control electromagnetic valve is opened, thereby causes electronic parts and components damage or system to be in uncontrollable state.
The 5th resistance R 4 is that the state that specially is used for detecting solenoid valve is used, and power diode 8 is the counterelectromotive force energy that are used for eliminating solenoid valve.Because the inductance characteristic of solenoid valve, when solenoid valve often is operated on off state (as the PWM state of a control time), opening to the moment of closing, can produce very big counterelectromotive force, if this counterelectromotive force is not eliminated, will certainly influence the components and parts that all are connected with solenoid valve, such as solenoid valve flash switch 2, solenoid valve lower edge switch 5 and single-chip microcomputer 1 etc.Because cumulative effect, relevant components and parts certainly will produce problems such as functional deficiency even damage under the impact of for a long time higher counterelectromotive force.In the parallel connection of solenoid valve two ends after the power diode 8, when solenoid valve by opening when change to close producing bigger counterelectromotive force, because the direction of this counterelectromotive force is consistent with the conducting direction of power diode 8, so solenoid valve and power diode 8 are under the effect of this counterelectromotive force, form a closed loop, the counterelectromotive force energy of solenoid valve will discharge rapidly by the form of power diode 8 with heat like this.And, the on resistance of the resistance of solenoid valve and power diode 8 is all very little, be similar to short circuit, so counterelectromotive force can discharge with very fast speed, so just guaranteed can not impact to other components and parts, also guaranteed simultaneously solenoid valve before next control signal is come, just discharged counterelectromotive force, and can next step control not impacted.If also do not discharge counterelectromotive force before next control signal is come, solenoid valve one is opened, because the polarity of power of electromagnetic valve is opposite with counterelectromotive force, at first power of electromagnetic valve need balance counterelectromotive force, could normally control.Power diode 8 has just guaranteed the Security and the controllability of system's control like this.
From the above mentioned, this circuit is by the level value combination of high-low level value and the flash feedback signal and the low limit feedback signal of flash control signal and low limit control signal, only need the switch motion of a solenoid valve, whether single-chip microcomputer 1 just can judge solenoid valve in proper functioning, and whether circuit exist other abnormalities, damages such as the flash switch, and lower edge switch damages, the solenoid valve open circuit, phenomenons such as solenoid valve short circuit.Can check out various states in the power-on self-test at the beginning in system, if there is abnormal phenomenon, single-chip microcomputer can in time be handled it, can close power supply or other actions (as emergency warning lamp demonstration or report diagnostic trouble code etc.) of solenoid valve by the flash control signal, power diode 8 has then been eliminated the counterelectromotive force that solenoid valve produced in the shortest time, avoided causing the instability of whole system control even the damage of control system electronic parts and components owing to the macro-energy of counterelectromotive force.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.In addition to the implementation, the present invention can also have other mode of execution.All employings are equal to the technological scheme of replacement or equivalent transformation formation, all drop within the present invention's scope required for protection.
Claims (7)
1. self-checking circuit is protected in the control of an automobile electromagnetic valve, comprise the single-chip microcomputer (1) and the solenoid valve that produce control signal, it is characterized in that: described single-chip microcomputer (1) is provided with flash control end (4), low limit control end (7), flash feedback end (9) and low limit feedback end (10), described flash control end (4) is communicated with the high edge connector of solenoid valve (3) by solenoid valve flash control circuit, low limit control end (7) is communicated with the low edge connector (6) of solenoid valve by the low limit of solenoid valve control circuit, between the low edge connector (6) of high edge connector of described solenoid valve (3) and solenoid valve solenoid valve is housed; Cross-over connection has the unidirectional breakover element of eliminating solenoid valve counterelectromotive force energy between the low edge connector (6) of high edge connector of described solenoid valve (3) and solenoid valve; The flash feedback end (9) of described single-chip microcomputer (1) is communicated with the high edge connector of solenoid valve (3) by solenoid valve flash feeder loop (14), and low limit feedback end (10) is communicated with the low edge connector (6) of solenoid valve by the low limit feeder loop (15) of solenoid valve.
2. the control protection self-checking circuit of automobile electromagnetic valve according to claim 1; it is characterized in that: described unidirectional breakover element is power diode (8); the negative electrode of described power diode (8) connects the high edge connector of solenoid valve (3), and anode connects the low edge connector (6) of solenoid valve.
3. the control protection self-checking circuit of automobile electromagnetic valve according to claim 1, it is characterized in that: described solenoid valve flash control circuit comprises flash wave filter (11) and solenoid valve flash switch (2), the flash control signal of described flash control end (4) output inputs to solenoid valve flash switch (2) to control its switching through flash wave filter (11), and the output terminal of described solenoid valve flash switch (2) and the high edge connector of solenoid valve (3) join; The low limit of described solenoid valve control circuit comprises low limit wave filter (12) and solenoid valve lower edge switch (5), the low limit control signal of described low limit control end (7) output inputs to solenoid valve lower edge switch (5) to control its switching through low limit wave filter (12), and the low edge connector (6) of the output terminal of described solenoid valve lower edge switch (5) and solenoid valve joins.
4. the control protection self-checking circuit of automobile electromagnetic valve according to claim 3 is characterized in that: be connected with level switch module (13) between described low limit wave filter (11) and the solenoid valve lower edge switch (5).
5. the control protection self-checking circuit of automobile electromagnetic valve according to claim 3, it is characterized in that: described flash wave filter (11) and low limit wave filter (12) are the RC mode filter.
6. the control of automobile electromagnetic valve according to claim 1 protection self-checking circuit is characterized in that: described solenoid valve flash feeder loop (14) comprises first resistance (R6) that links to each other with the high edge connector of solenoid valve (3) input end, also second resistance (R8) of ground connection of connecting with first resistance (R6); The low limit feeder loop (15) of described solenoid valve comprises the 3rd resistance (R13) that links to each other with low edge connector (6) input end of solenoid valve, also the 4th resistance (R15) of ground connection of connecting with the 3rd resistance (R13); Cross-over connection has the 5th resistance (R4) that detects the solenoid valve state between the low edge connector (6) of high edge connector of described solenoid valve (3) and solenoid valve.
7. the control protection self-checking circuit of automobile electromagnetic valve according to claim 6; it is characterized in that: described second resistance (R8) two ends are parallel with first electric capacity (C7) of eliminating undesired signal, and the two ends of described the 4th resistance (R15) are parallel with second electric capacity (C14) of eliminating undesired signal.
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| CN201010288303XA CN101956857B (en) | 2010-09-21 | 2010-09-21 | Control and protection self-checking circuit of vehicle electromagnetic valve |
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|---|---|---|---|
| CN201010288303XA CN101956857B (en) | 2010-09-21 | 2010-09-21 | Control and protection self-checking circuit of vehicle electromagnetic valve |
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| CN101956857A true CN101956857A (en) | 2011-01-26 |
| CN101956857B CN101956857B (en) | 2012-07-04 |
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| CN105487456A (en) * | 2016-01-22 | 2016-04-13 | 安徽江淮汽车股份有限公司 | Clutch solenoid valve control circuit and method |
| CN106153086A (en) * | 2016-07-27 | 2016-11-23 | 河北秦汉电子科技有限公司 | A kind of electromagnetic valve work condition checkout gear |
| CN107167694A (en) * | 2017-06-07 | 2017-09-15 | 惠州市德赛西威汽车电子股份有限公司 | A kind of magnetic valve earth fault detection circuit of automobile outer control variable displacement compressor |
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| 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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