CN111486003A - Rotational speed signal acquisition circuit with broken string detects function - Google Patents
Rotational speed signal acquisition circuit with broken string detects function Download PDFInfo
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- CN111486003A CN111486003A CN201911372612.2A CN201911372612A CN111486003A CN 111486003 A CN111486003 A CN 111486003A CN 201911372612 A CN201911372612 A CN 201911372612A CN 111486003 A CN111486003 A CN 111486003A
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- 239000003990 capacitor Substances 0.000 claims abstract description 67
- 230000001681 protective effect Effects 0.000 claims abstract description 52
- 238000001514 detection method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 64
- 238000001816 cooling Methods 0.000 claims description 31
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 claims description 16
- 210000003437 trachea Anatomy 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 8
- 239000000498 cooling water Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 4
- 229920000742 Cotton Polymers 0.000 claims description 3
- 239000003365 glass fiber Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 229910001021 Ferroalloy Inorganic materials 0.000 claims description 2
- 210000002615 epidermis Anatomy 0.000 claims 2
- 238000001914 filtration Methods 0.000 claims 1
- 230000017525 heat dissipation Effects 0.000 abstract description 9
- 239000010410 layer Substances 0.000 description 17
- 239000002344 surface layer Substances 0.000 description 10
- 238000009413 insulation Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000001771 impaired effect Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D41/222—Safety or indicating devices for abnormal conditions relating to the failure of sensors or parameter detection devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a rotating speed signal acquisition circuit with a wire breakage detection function, which belongs to the technical field of rotating speed signal acquisition circuits and comprises a rotating speed sensor, a circuit board and a protective box, wherein the rotating speed sensor is fixedly arranged on the outer wall of the left side of the protective box, the circuit board is fixedly arranged on the inner wall of the bottom of the protective box, the circuit board is provided with a signal acquisition circuit, and the signal acquisition circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a triode Q1, a diode D1, a diode D2, a diode D3 and a single chip microcomputer. The acquisition of rotating speed signals can be completed through a simple circuit, the circuit cost is reduced, the broken line detection function is realized, and the problem can be fed back in time, so that the safety of the operation of the diesel engine is ensured, the heat dissipation performance is good, and the circuit can be prevented from being damaged due to high temperature.
Description
Technical Field
The invention relates to the field of a rotating speed signal acquisition circuit, in particular to a rotating speed signal acquisition circuit with a wire breakage detection function.
Background
In the operation process of the diesel engine, the rotating speed of the engine is a parameter which is mainly monitored in the operation process of the diesel engine, if the rotating speed sensor is disconnected, personnel can find and check the reason of the disconnection in time, and the work safety of the diesel engine can be ensured, so that the rotating speed signal acquisition disconnection detection function is particularly important.
In the prior art, the rotating speed signal acquisition circuit mostly adopts an operational amplifier to follow a sensor signal and then enter a comparator, and sine waves are compared with a reference to generate square waves, so that the rotating speed signal is acquired, the circuit cost is high, and the rotating speed signal acquisition circuit does not have the detection function of sensor open circuit. Therefore, a rotating speed signal acquisition circuit with a wire breakage detection function is provided.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a rotating speed signal acquisition circuit with a wire break detection function, which can realize the acquisition of rotating speed signals through a simple circuit, reduce the circuit cost, have the wire break detection function and can feed back the problems in time, thereby ensuring the safety of the operation of a diesel engine, having good heat radiation performance and preventing the circuit from being damaged due to high temperature.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The utility model provides a rotational speed signal acquisition circuit with broken string detects function, includes speed sensor, circuit board and protective housing, speed sensor fixed mounting is on the left side outer wall of protective housing, circuit board fixed mounting is on the bottom inner wall of protective housing.
The circuit board is provided with a signal acquisition circuit, and the signal acquisition circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a triode Q1, a diode D1, a diode D2, a diode D3 and a single chip microcomputer.
The rotation speed sensor is electrically connected with a cathode of a capacitor C1 and a cathode of a diode D1, one end of the capacitor C1 far away from the rotation speed sensor is electrically connected with a resistor R3, one end of the resistor R3 far away from a capacitor C1 is electrically connected with a capacitor C3 and a resistor R3, one end of the capacitor C3 far away from the resistor R3 is grounded, one end of the resistor R3 far away from the resistor R3 is electrically connected with a base of a transistor Q3 and a cathode of the diode D3, an anode of the diode D3 is grounded, an emitter of the transistor Q3 is grounded, a collector of the transistor Q3 is electrically connected with the resistor R3, the capacitor C3 and a timer pin of the single chip microcomputer, one end of the resistor R3 far away from the transistor Q3 is connected with a VCC, one end of the capacitor C3 far away from the transistor Q3 is grounded, an anode of the diode D3 is electrically connected with the resistor R3 and a cathode of the diode D3 far away from the diode D3, The capacitor C2 is electrically connected with an ADC pin of the singlechip, and one end of the capacitor C2, which is far away from the resistor R2, and the anode of the diode D2 are both grounded.
Further, the resistor R3 and the capacitor C3 form an RC filter, the capacitor C1 is an isolation capacitor, the capacitors C2 and C4 are filter capacitors, the resistors R1 and R2 are divider resistors, the resistor R4 is a bias resistor, the resistor R5 is a pull-up resistor, and the triode Q1 is an NPN triode.
Further, the resistance value of the resistor R1 is 10k Ω, the resistance value of the resistor R2 is 10k Ω, the resistance value of the resistor R3 is 2k Ω, the resistance value of the resistor R4 is 2k Ω, and the resistance value of the resistor R5 is 4.7k Ω.
Further, the capacitance of the capacitor C1 is 2.2 muF, the capacitance of the capacitor C2 is 0.1 muF, the capacitance of the capacitor C3 is 0.1 muF, and the capacitance of the capacitor C4 is 30 pF.
Further, the outer wall of protective housing includes top layer, insulating layer and lower top layer from outside to inside in proper order, top layer and lower top layer material are ferroalloy, the material of insulating layer is the glass fiber cotton board, and the setting of top layer and lower top layer can improve the toughness of protective housing, in the diesel engine working process, can produce higher temperature, and the setting of insulating layer can improve the thermal-insulated function of protective housing, prevents that external high temperature from influencing signal acquisition circuit's operation.
Furthermore, fixed mounting has first backup pad on the right side outer wall of protective housing, fixed mounting has the cold water storage cistern on the top outer wall of first backup pad, the inside of cold water storage cistern holds 10-15 ℃ of cold water, fixed mounting has a plurality of heat conduction stick on the left outer wall of cold water storage cistern, the heat conduction stick runs through on the right side outer wall of protective housing and switches on rather than inside, through the setting of cold water storage cistern and heat conduction stick, can make the heat in the protective housing pass to the cold water in the cold water storage cistern through the heat conduction stick, and then cools down to the protective housing inside, has improved the heat dissipation function, prevents that the circuit board is impaired because of high temperature.
Further, the intercommunication has the inlet tube on the top outer wall of cold water storage cistern, threaded connection has the tube cap on the outer wall of inlet tube, the bottom intercommunication of cold water storage cistern right side outer wall has the drain pipe, be provided with the valve on the outer wall of drain pipe, the junction of heat conduction stick and cold water storage cistern inner wall is equipped with the sealing ring of fixed mounting on the heat conduction stick outer wall, and the setting of sealing ring can prevent that heat conduction stick and cold water storage cistern junction from taking place to leak, and the setting of inlet tube, tube cap, drain pipe, valve is rotatory to be unscrewed the tube cap, can be through the inlet tube to pouring in cold water storage cistern cold water, opens the valve, can be through drain pipe drainage cold water, and then be convenient.
Furthermore, a circulating cooling box is fixedly installed at the top end of the protection box, cooling water of 7-10 ℃ is contained in the circulating cooling box, a serpentine pipeline is fixedly installed in the circulating cooling box, and two ends of the serpentine pipeline penetrate through the outer walls of the left side and the right side of the circulating cooling box respectively.
Further, fixedly connected with second backup pad on the left side outer wall of circulative cooling case, fixedly connected with exhaust fan on the top outer wall of second backup pad, the end intercommunication of giving vent to anger of exhaust fan has first trachea, fixedly mounted has the third backup pad on the right side outer wall of circulative cooling case, fixedly mounted has the suction fan on the top outer wall of third backup pad, the end intercommunication of giving vent to anger of suction fan has the second trachea, serpentine pipeline's both ends communicate in the end of giving vent to anger of the inlet end of exhaust fan and suction fan respectively.
Further, the one end that the exhaust fan was kept away from to first trachea runs through the protective housing and is linked together rather than inside, the one end that the suction fan was kept away from to the second trachea runs through the protective housing and is linked together rather than inside, through circulative cooling case, serpentine pipe, the second backup pad, the exhaust fan, first trachea, the third backup pad, the suction fan, the tracheal setting of second, make in the hot gas suction serpentine pipe of suction fan accessible second trachea in with the protective housing, the cooling water in the circulative cooling incasement cools down steam, the exhaust fan is in the protective housing with the gas emission after the cooling again, thereby form circulation circuit and cool down to the protective housing inside, further improvement the heat dissipation function, prevent that circuit board and signal acquisition circuit are impaired because of high temperature.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) this scheme is through setting up the signal acquisition circuit, and this signal acquisition circuit is different from the fortune circuit of putting of complicacy, can accomplish the collection to the rotational speed signal through simple circuit, and it is lower to put the circuit cost who gathers the rotational speed signal through fortune with the conventionality relatively, and is stronger to outside interference killing feature, and possesses the broken string and detects the function, can in time feed back the problem to guarantee the safety of diesel engine operation.
(2) Through the setting of top layer and lower top layer, can improve the toughness of protective housing, in the diesel engine working process, can produce higher temperature, the setting of insulating layer can improve the thermal-insulated function of protective housing, prevents that external high temperature from influencing signal acquisition circuit's operation.
(3) Through the setting of cold water storage cistern and heat conduction stick, can make the heat in the protective housing pass to the cold water in the cold water storage cistern through the heat conduction stick, and then cool down to the protective housing is inside, improved the heat dissipation function, prevent that the circuit board is impaired because of the high temperature.
(4) The setting of sealing ring can prevent that heat conduction stick and cold water storage cistern junction from taking place to leak, and the setting of inlet tube, tube cap, drain pipe, valve is rotatory unscrewed the tube cap, can be through the inlet tube to pouring into cold water into the cold water storage cistern, opens the valve, can be through drain pipe drainage cold water, and then be convenient for change cold water.
(5) Through circulative cooling case, serpentine pipeline, the second backup pad, the exhaust fan, first trachea, the third backup pad, the suction fan, the tracheal setting of second, make in the hot gas suction serpentine pipeline of suction fan accessible second trachea in with the protective housing, the cooling water in the circulative cooling incasement cools down steam, the exhaust fan is again with the gaseous protective housing of discharging after cooling in, thereby form circulation circuit and cool down to the protective housing inside, further improvement the heat dissipation function, prevent that circuit board and signal acquisition circuit from being impaired because of the high temperature.
Drawings
FIG. 1 is a circuit diagram of a signal acquisition circuit of the present invention;
FIG. 2 is a front view of the protective enclosure of the present invention;
FIG. 3 is a cross-sectional view of the outer wall of the protective enclosure of the present invention;
FIG. 4 is a sectional view of the inside of a cold water tank according to the present invention;
fig. 5 is a cross-sectional view of the interior of the protective enclosure and the recirculating cooling enclosure of the present invention.
The reference numbers in the figures illustrate:
1. a rotational speed sensor; 2. a circuit board; 3. a protective box; 301. an upper surface layer; 302. a thermal insulation layer; 303. a lower surface layer; 4. a first support plate; 5. a cold water tank; 6. a water inlet pipe; 7. a tube cover; 8. a drain pipe; 9. a valve; 10. a heat conducting rod; 11. a seal ring; 12. a circulating cooling tank; 13. a serpentine conduit; 14. a second support plate; 15. an exhaust fan; 16. a first air pipe; 17. a third support plate; 18. a suction fan; 19. a second air pipe.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
referring to fig. 1 and 5, a rotational speed signal acquisition circuit with a disconnection detection function includes a rotational speed sensor 1, a circuit board 2 and a protection box 3, the rotational speed sensor 1 is fixedly installed on the outer wall of the left side of the protection box 3, the circuit board 2 is fixedly installed on the inner wall of the bottom of the protection box 3, the circuit board 2 is provided with a signal acquisition circuit, the signal acquisition circuit includes a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a triode Q1, a diode D1, a diode D2, a diode D3 and a single chip microcomputer, the resistor R3 and the capacitor C3 form an RC filter, the capacitor C1 is an isolation capacitor, the capacitor C2 and the capacitor C4 are filter capacitors, the resistor R1 and the resistor R2 are divider resistors, the resistor R4 is a bias resistor, the resistor R5 is a pull-up resistor Q1, the triode Q1 is a resistor 10 Ω, the resistance of the resistor R2 is 10k Ω, the resistance of the resistor R3 is 2k Ω, the resistance of the resistor R4 is 2k Ω, the resistance of the resistor R5 is 4.7k Ω, the capacitance of the capacitor C1 is 2.2 μ F, the capacitance of the capacitor C2 is 0.1 μ F, the capacitance of the capacitor C3 is 0.1 μ F, the capacitance of the capacitor C4 is 30pF, the tachometer sensor 1 is electrically connected to the cathode of the capacitor C1 and the diode D1, the end of the capacitor C1 remote from the tachometer sensor 1 is electrically connected to the resistor R3, the end of the resistor R3 remote from the capacitor C1 is electrically connected to the capacitor C3 and the resistor R4, the end of the capacitor C3 remote from the resistor R3 is grounded, the end of the resistor R4 remote from the resistor R4 is connected to the base of the transistor Q4 and the diode D4, the anode of the diode D4 is grounded, the emitter of the transistor Q4 is grounded, the timing circuit of the transistor Q4 and the collector of the monolithic computer 4, one end of a resistor R5 far away from a triode Q1 is connected with VCC, one end of a capacitor C4 far away from a triode Q1 is grounded, the anode of a diode D1 is electrically connected with a resistor R1 and a resistor R2, one end of a resistor R1 far away from a diode D1 is connected with VCC, one end of a resistor R2 far away from a diode D1 is electrically connected with the cathode of a diode D2, a capacitor C2 and an ADC pin of a singlechip, one end of a capacitor C2 far away from a resistor R2 and the anode of a diode D2 are grounded, the capacitor C1 can isolate the interference of a disconnection detection end VCC on a rotation speed signal acquisition circuit, the weak change of potential generated by rotation speed changes the voltage of a point A through a triode Q1 so as to acquire a rotation speed signal, the disconnection detection output is high level under the normal working condition of the rotation speed sensor 1, when the rotation speed is not input, the diode D1 is conducted, the voltage of a point B is changed so as to achieve the, can accomplish the collection to the rotational speed signal through simple circuit, it is lower to compare with the circuit cost of gathering the rotational speed signal through fortune is put with the conventionality, and is stronger to outside interference killing feature, and possesses the broken string and detect the function, can in time feed back the problem to guarantee the safety of diesel engine operation.
Referring to fig. 2 and 4-5, the outer wall of the protection box 3 sequentially comprises an upper surface layer 301, a heat insulation layer 302 and a lower surface layer 303 from outside to inside, the upper surface layer 301 and the lower surface layer 303 are made of iron alloy, the heat insulation layer 302 is made of glass fiber cotton, and the lower surface layer 303 of the upper surface layer 301 is arranged, so that the toughness of the protection box 3 can be improved, higher temperature can be generated in the working process of a diesel engine, the heat insulation function of the protection box 3 can be improved due to the arrangement of the heat insulation layer 302, and the operation of a signal acquisition circuit is prevented from being influenced by external high temperature.
Referring to fig. 2 and 5, a first support plate 4 is fixedly installed on the outer wall of the right side of a protection box 3, a cold water box 5 is fixedly installed on the outer wall of the top of the first support plate 4, cold water of 10-15 ℃ is contained in the cold water box 5, a plurality of heat conducting rods 10 are fixedly installed on the outer wall of the left side of the cold water box 5, the heat conducting rods 10 penetrate through the outer wall of the right side of the protection box 3 and are communicated with the inside of the protection box 3, through the arrangement of the cold water box 5 and the heat conducting rods 10, heat in the protection box 3 can be conducted to the cold water in the cold water box 5 through the heat conducting rods 10, the inside of the protection box 3 is cooled, the heat dissipation function is improved, the circuit board is prevented from being damaged due to high temperature, a water inlet pipe 6 is communicated with the outer wall of the top of the cold water box 5, a pipe cover 7 is connected to the outer wall of the, the joint of the heat conducting rod 10 and the inner wall of the cold water tank 5 is provided with a sealing ring 11 fixedly arranged on the outer wall of the heat conducting rod 10, the sealing ring 11 is arranged to prevent the joint of the heat conducting rod 10 and the cold water tank 5 from leaking, the water inlet pipe 6, the pipe cover 7, the drain pipe 8 and the valve 9 are arranged, the pipe cover 7 is screwed off in a rotating way, cold water can be injected into the cold water tank 5 through the water inlet pipe 6, the valve 9 is opened, the cold water can be drained through the drain pipe 8, and therefore the cold water is convenient to replace, the top end of the protective tank 3 is fixedly provided with a circulating cooling tank 12, the inside of the circulating cooling tank 12 is provided with cooling water with the temperature of 7-10 ℃, the inside of the circulating cooling tank 12 is fixedly provided with a serpentine pipeline 13, two ends of the serpentine pipeline 13 respectively penetrate through the outer walls of the left side and the right side of the circulating cooling tank 12, the outer wall of, the air outlet end of the exhaust fan 15 is communicated with a first air pipe 16, the right outer wall of the circulating cooling box 12 is fixedly provided with a third supporting plate 17, the outer wall of the top part of the third supporting plate 17 is fixedly provided with a suction fan 18, the air outlet end of the suction fan 18 is communicated with a second air pipe 19, two ends of the serpentine pipeline 13 are respectively communicated with the air inlet end of the exhaust fan 15 and the air outlet end of the suction fan 18, one end of the first air pipe 16 far away from the exhaust fan 15 penetrates through the protective box 3 and is communicated with the interior of the protective box, one end of the second air pipe 19 far away from the suction fan 18 penetrates through the protective box 3 and is communicated with the interior of the protective box, and hot air in the protective box 3 can be pumped into the serpentine pipeline 13 by the circulating cooling box 12, the serpentine pipeline 13, the second supporting plate 14, the exhaust fan 15, the first air pipe 16, the third supporting plate 17, the suction fan 18 and the second, the cooling water in the circulation cooling box 12 cools down steam, and the exhaust fan 15 is discharged the gas after cooling into protective housing 3 again to form circulation circuit and cool down protective housing 3 is inside, further improvement the heat dissipation function, prevent that circuit board 2 and signal acquisition circuit are impaired because of the high temperature.
The signal acquisition circuit is different from a complex operational amplifier circuit, the acquisition of the rotation speed signal can be completed through a simple circuit, compared with the conventional circuit for acquiring the rotation speed signal through the operational amplifier, the cost is lower, the external anti-interference capability is stronger, the circuit has a broken line detection function, the problem can be fed back in time, the operation safety of a diesel engine is ensured, the toughness of the protective box 3 can be improved through the arrangement of the upper surface layer 301 and the lower surface layer 303, higher temperature can be generated in the working process of the diesel engine, the heat insulation function of the protective box 3 can be improved through the arrangement of the heat insulation layer 302, the operation of the signal acquisition circuit is prevented from being influenced by the external high temperature, the heat in the protective box 3 can be transmitted to cold water in the cold water box 5 through the heat conduction rod 10 through the arrangement of the cold water box 5 and the heat conduction rod 10, the temperature inside of the protective box 3 is further reduced, and the, the circuit board 2 is prevented from being damaged due to high temperature, the sealing ring 11 is arranged, leakage at the joint of the heat conducting rod 10 and the cold water tank 5 can be prevented, the water inlet pipe 6, the pipe cover 7, the drain pipe 8 and the valve 9 are arranged, the pipe cover 7 is screwed off in a rotating mode, cold water can be injected into the cold water tank 5 through the water inlet pipe 6, the valve 9 is opened, the cold water can be drained through the drain pipe 8, and therefore the cold water is convenient to replace, hot air in the protective box 3 can be pumped into the serpentine pipeline 13 through the circulating cooling box 12, the serpentine pipeline 13, the second supporting plate 14, the exhaust fan 15, the first air pipe 16, the third supporting plate 17, the suction fan 18 and the second air pipe 19, the cooling water in the circulating cooling box 12 cools the hot air, the exhaust fan 15 exhausts the cooled air into the protective box 3, so that a circulating loop is formed to cool the interior of the protective box 3, the heat dissipation function is further improved, and the circuit board 2 and the signal acquisition circuit are prevented from being damaged due to high temperature; compared with the prior art, the acquisition of the rotating speed signal can be completed through a simple circuit, the circuit cost is reduced, the broken line detection function is realized, the problem can be fed back in time, the operation safety of the diesel engine is ensured, the heat dissipation performance is good, and the circuit can be prevented from being damaged due to high temperature.
The foregoing is only a preferred embodiment of the present invention; the scope of the invention is not limited thereto. Any person skilled in the art should be able to cover the technical scope of the present invention by equivalent or modified solutions and modifications within the technical scope of the present invention.
Claims (10)
1. The utility model provides a rotational speed signal acquisition circuit with broken string detects function, includes speed sensor (1), circuit board (2) and guard box (3), its characterized in that: the rotating speed sensor (1) is fixedly arranged on the outer wall of the left side of the protective box (3), and the circuit board (2) is fixedly arranged on the inner wall of the bottom of the protective box (3);
the circuit board (2) is provided with a signal acquisition circuit, and the signal acquisition circuit comprises a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a triode Q1, a diode D1, a diode D2, a diode D3 and a singlechip;
the tachometer sensor (1) is electrically connected with a capacitor C1 and a cathode of a diode D1, one end of the capacitor C1 away from the tachometer sensor (1) is electrically connected with a resistor R3, one end of the resistor R3 away from the capacitor C1 is electrically connected with a capacitor C3 and a resistor R4, one end of the capacitor C3 away from the resistor R3 is grounded, one end of the resistor R4 away from the resistor R3 is electrically connected with a base of a transistor Q1 and a cathode of a diode D3, an anode of the diode D3 is grounded, an emitter of the transistor Q1 is grounded, a collector of the transistor Q1 is electrically connected with the resistor R1, the capacitor C1 and a timer pin of the single chip microcomputer, one end of the resistor R1 away from the transistor Q1 is connected with VCC, one end of the capacitor C1 away from the transistor Q1 is grounded, an anode of the diode D1 is electrically connected with the resistor R1 and the resistor R1, one end of the resistor R36, one end of the resistor R2, which is far away from the diode D1, is electrically connected with the cathode of the diode D2, the capacitor C2 and an ADC pin of the single chip microcomputer, and one end of the capacitor C2, which is far away from the resistor R2, and the anode of the diode D2 are grounded.
2. A tachometer signal generator circuit having a break detection function according to claim 1, wherein: the resistance R3 and the electric capacity C3 constitute the RC filtering, electric capacity C1 is isolation capacitor, electric capacity C2, electric capacity C4 are filter capacitance, resistance R1, resistance R2 are divider resistance, resistance R4 is offset resistance, resistance R5 is pull-up resistance, triode Q1 is the NPN triode.
3. A tachometer signal generator circuit having a break detection function according to claim 1, wherein: the resistance value of the resistor R1 is 10k omega, the resistance value of the resistor R2 is 10k omega, the resistance value of the resistor R3 is 2k omega, the resistance value of the resistor R4 is 2k omega, and the resistance value of the resistor R5 is 4.7k omega.
4. A tachometer signal generator circuit having a break detection function according to claim 1, wherein: the capacitance of the capacitor C1 is 2.2 muF, the capacitance of the capacitor C2 is 0.1 muF, the capacitance of the capacitor C3 is 0.1 muF, and the capacitance of the capacitor C4 is 30 pF.
5. A tachometer signal generator circuit having a break detection function according to claim 1, wherein: the outer wall of protective housing (3) includes upper epidermis (301), insulating layer (302) and lower top layer (303) from outside to inside in proper order, upper epidermis (301) and lower top layer (303) material are ferroalloy, the material of insulating layer (302) is the cotton board of glass fiber.
6. A tachometer signal generator circuit having a break detection function according to claim 1, wherein: the solar water heater is characterized in that a first supporting plate (4) is fixedly mounted on the outer wall of the right side of the protective box (3), a cold water tank (5) is fixedly mounted on the outer wall of the top of the first supporting plate (4), cold water at 10-15 ℃ is contained in the cold water tank (5), a plurality of heat conducting rods (10) are fixedly mounted on the outer wall of the left side of the cold water tank (5), and the heat conducting rods (10) penetrate through the outer wall of the right side of the protective box (3) and are communicated with the inside of the protective box.
7. A tachometer signal generator circuit with a break detection function according to claim 6, characterized in that: the water cooling device is characterized in that a water inlet pipe (6) is communicated with the outer wall of the top of the cold water tank (5), a pipe cover (7) is connected to the outer wall of the water inlet pipe (6) in a threaded mode, a water drain pipe (8) is communicated with the bottom end of the outer wall of the right side of the cold water tank (5), a valve (9) is arranged on the outer wall of the water drain pipe (8), and a sealing ring (11) fixedly mounted on the outer wall of the heat conducting rod (10) is arranged at the joint of the heat conducting rod (10) and the.
8. A tachometer signal generator circuit having a break detection function according to claim 1, wherein: the top fixed mounting of guard box (3) has circulative cooling case (12), the inside of circulative cooling case (12) holds 7-10 ℃ of cooling water, the inside fixed mounting of circulative cooling case (12) has serpentine pipeline (13), the outer wall of circulative cooling case (12) left and right sides is run through respectively at the both ends of serpentine pipeline (13).
9. The detecting method of a rotation speed signal collecting circuit with a disconnection detecting function according to claim 8, wherein: fixedly connected with second backup pad (14) on the left side outer wall of circulative cooling case (12), fixedly connected with exhaust fan (15) on the top outer wall of second backup pad (14), the end intercommunication of giving vent to anger of exhaust fan (15) has first trachea (16), fixedly mounted has third backup pad (17) on the right side outer wall of circulative cooling case (12), fixed mounting has suction fan (18) on the top outer wall of third backup pad (17), the end intercommunication of giving vent to anger of suction fan (18) has second trachea (19), the both ends of serpentine pipeline (13) are linked together in the end of giving vent to anger of the inlet end of exhaust fan (15) and suction fan (18) respectively.
10. The detecting method of a rotation speed signal collecting circuit with a disconnection detecting function according to claim 9, characterized in that: one end, far away from exhaust fan (15), of first trachea (16) runs through protective housing (3) and is linked together rather than inside, one end, far away from suction fan (18), of second trachea (19) runs through protective housing (3) and is linked together rather than inside.
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| CN111486003B (en) | 2022-04-05 |
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