CN114135475B - Position control device and diesel engine fuel pump speed regulation system - Google Patents
Position control device and diesel engine fuel pump speed regulation system Download PDFInfo
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- CN114135475B CN114135475B CN202111461123.1A CN202111461123A CN114135475B CN 114135475 B CN114135475 B CN 114135475B CN 202111461123 A CN202111461123 A CN 202111461123A CN 114135475 B CN114135475 B CN 114135475B
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- cylinder
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- 239000000446 fuel Substances 0.000 title claims abstract description 25
- 230000007246 mechanism Effects 0.000 claims abstract description 43
- 238000004891 communication Methods 0.000 claims abstract description 23
- 230000008713 feedback mechanism Effects 0.000 claims abstract description 18
- 230000001276 controlling effect Effects 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 230000000903 blocking effect Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 4
- 239000003921 oil Substances 0.000 description 19
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
- F02M37/043—Arrangements for driving reciprocating piston-type pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/22—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by means of valves
Abstract
The invention relates to the technical field of diesel engines, in particular to a position control device and a speed regulating system of a fuel pump of a diesel engine. The position control device provided by the invention comprises a hydraulic cylinder, an adjusting mechanism and a feedback mechanism, wherein the hydraulic cylinder comprises a cylinder body and a piston which is arranged in the cylinder body in a sliding manner, and the piston is used for controlling the supply flow of a fuel pump; the adjusting mechanism is used for driving the piston to slide in the cylinder in a reciprocating manner; the feedback mechanism is in communication connection with the adjusting mechanism and is used for detecting the position of the piston and controlling the adjusting mechanism to drive the piston to slide or stop driving the piston according to the position information of the piston. The position adjusting device controls the movement of the piston through the adjusting mechanism, then the feedback mechanism detects the position of the piston, if the adjusting mechanism does not drive the piston to the target position, the feedback mechanism can feed back, and then the adjusting mechanism drives and adjusts the piston further so as to accurately adjust the position of the piston, and the stability of the device is improved.
Description
Technical Field
The invention relates to the technical field of diesel engines, in particular to a position control device and a speed regulating system of a fuel pump of a diesel engine.
Background
Diesel engine speed regulation is primarily the regulation of the fuel pump supply flow rate, which is related to the position of the regulating structure thereon. The position adjusting device of the existing fuel pump is continuously developed and improved from mechanical and electronic modes, and the precision, stability and responsiveness are rapidly improved. However, the mechanical adjusting structure is simple, but the working capacity is small, and the responsiveness and the precision are poor; the electronic adjusting mechanism has good precision and response, but small working capacity.
Therefore, there is a need for a position control device with high stability and high precision to solve the above problems.
Disclosure of Invention
An object of the present invention is to provide a position control device with improved stability and accuracy.
Another object of the present invention is to provide a fuel pump speed regulation system for a diesel engine, which can stably and precisely regulate the supply flow rate of the fuel pump and improve the speed control capability of the diesel engine by using the above-mentioned position control device.
In order to achieve the above object, the following technical scheme is provided:
in one aspect, a position control device is provided for controlling a supply flow of a fuel pump; the position control device includes:
the hydraulic cylinder comprises a cylinder body and a piston which is arranged in the cylinder body in a sliding manner, and the piston is used for controlling the supply flow of the fuel pump;
the adjusting mechanism is used for driving the piston to slide in the cylinder in a reciprocating manner;
and the feedback mechanism is in communication connection with the adjusting mechanism and is used for detecting the position of the piston and controlling the adjusting mechanism to drive the piston to slide or stop driving the piston according to the position information of the piston.
As an alternative to the position control device, the piston includes:
a first sliding part slidably engaged with the cylinder block and dividing the cylinder block into a first hydraulic chamber and a second hydraulic chamber;
the connecting part is connected to one end of the first sliding part, and the adjusting mechanism is matched with the connecting part to control the piston to move;
and the output part is connected with the other end of the first sliding part and is used for controlling the supply flow of the fuel pump.
As an alternative to the position control device, the area of the first hydraulic chamber acting on the first sliding portion is larger than the area of the second hydraulic chamber acting on the first sliding portion. When the pressure of the first hydraulic chamber is equal to the pressure of the second hydraulic chamber, the first sliding portion moves in the direction of the second hydraulic chamber.
As an alternative to the position control device, the adjusting mechanism includes:
one end of the feedback piece is pivoted with the connecting part, the other end of the feedback piece is pivoted with the external fixing piece, and the feedback piece is convexly provided with a pressing piece;
the electrohydraulic servo assembly comprises an electromagnetic valve, a hydraulic valve and an adjusting piece, wherein the adjusting piece is in abutting connection with the pressing piece, and the electromagnetic valve is coupled with the hydraulic valve to drive the adjusting piece to move so as to control the piston to move.
As an alternative to the position control device, the hydraulic valve includes:
the valve body is provided with a first connecting port, a second connecting port and a third connecting port which are communicated with each other, the first connecting port is communicated with the first hydraulic cavity, the second connecting port is communicated with the oil pump and the second hydraulic cavity through a three-way pipe, and the third connecting port is communicated with the oil tank;
the valve core comprises a sliding part and a circulating part, wherein the sliding part and the valve body are connected in a sliding fit mode, the diameter of the sliding part is larger than that of the circulating part, a blocking protrusion is arranged on the circulating part in a protruding mode, the blocking protrusion always blocks communication between the second connecting port and the third connecting port, and selectively blocks communication between the first connecting port and the second connecting port or communication between the first connecting port and the third connecting port.
As an alternative scheme of the position control device, the first connecting port and the second connecting port are both arranged on the side wall of the valve body, the first connecting port is positioned between the second connecting port and the third connecting port, and the plugging protrusion is positioned at the middle position of the circulation part.
As an alternative scheme of the position control device, when the plugging protrusion is located below the first connection port, the first connection port is communicated with the second connection port, at this time, the pressure of the first hydraulic cavity is equal to the pressure of the second hydraulic cavity, and since the acting area of the second hydraulic cavity acting on the first sliding part is smaller than the acting area of the first hydraulic cavity acting on the first sliding part, the piston moves towards the direction of the second hydraulic cavity; when the plugging protrusion is located above the first connecting port, the first connecting port is communicated with the third connecting port, the pressure of the first hydraulic cavity is smaller than that of the second hydraulic cavity, and the piston moves towards the direction of the first hydraulic cavity under the action of the pressure difference between the second hydraulic cavity and the first hydraulic cavity.
As an alternative to the position control device, the solenoid valve includes:
one end of the connecting piece is connected with the valve core, the other end of the connecting piece is connected with the adjusting piece, and a convex ring is arranged on the connecting piece;
the first elastic piece is compressed between the convex ring and the valve body;
the direction of the acting force of the electromagnet acting on the connecting piece is opposite to the direction of the acting force of the first elastic piece acting on the connecting piece.
As an alternative to the position control device, the electrohydraulic servo assembly further includes a second elastic member compressed between the connecting member and the regulating member for holding the regulating member in abutment with the pressing member.
As an alternative of the position control device, the feedback mechanism includes a position sensor communicatively connected to the adjusting mechanism, the position sensor includes a mounting portion and a detecting portion, the mounting portion is disposed on an outer wall of the cylinder, and the detecting portion extends into the cylinder and is used for detecting a position of the piston.
As an alternative scheme of the position control device, a sliding groove extending along the sliding direction of the piston is formed in the piston, and the detection part is in sliding fit with the sliding groove.
In a second aspect, there is provided a diesel engine fuel pump speed regulation system comprising a position control device as described above.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a position control device, which comprises a hydraulic cylinder, an adjusting mechanism and a feedback mechanism, wherein the hydraulic cylinder comprises a cylinder body and a piston which is arranged in the cylinder body in a sliding manner, and the piston is used for controlling the supply flow of a fuel pump; the adjusting mechanism is used for driving the piston to slide in the cylinder in a reciprocating manner; the feedback mechanism is in communication connection with the adjusting mechanism and is used for detecting the position of the piston and controlling the adjusting mechanism to drive the piston to slide or stop driving the piston according to the position information of the piston. The position adjusting device controls the movement of the piston through the adjusting mechanism, then the feedback mechanism detects the position of the piston, if the adjusting mechanism does not drive the piston to the target position, the feedback mechanism can feed back, and then the adjusting mechanism drives and adjusts the piston further so as to accurately adjust the position of the piston, and the stability of the device is improved.
According to the speed regulating system of the fuel pump of the diesel engine, provided by the invention, the supply flow of the fuel pump can be stably and accurately regulated by applying the position control device, and the speed control capability of the diesel engine is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
Fig. 1 is a schematic structural diagram of a position control device according to an embodiment of the present invention.
Reference numerals:
1. a hydraulic cylinder; 11. a cylinder; 12. a piston; 121. a first sliding portion; 122. a connection part; 123. an output unit; 124. a second sliding part; 1241. a chute;
2. a feedback member; 21. a pressing piece;
3. an electromagnetic valve; 31. a connecting piece; 311. a convex ring; 32. a first elastic member; 33. an electromagnet;
41. a valve body; 411. a first connection port; 412. a second connection port; 413. a third connection port; 42. a valve core; 421. a sliding part; 422. a flow-through section; 4221. plugging the bulge;
5. an adjusting member;
6. a second elastic member;
7. a position sensor; 71. a mounting part; 72. a detection unit;
100. a first hydraulic chamber; 200. a second hydraulic chamber; 300. balance cavity.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of 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, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; either mechanically or electrically. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
As shown in fig. 1, the present embodiment provides a position control device, which can be used to control the supply flow of a fuel pump, and has better stability and higher accuracy.
The position control device comprises a hydraulic cylinder 1, an adjusting mechanism and a feedback mechanism, wherein the hydraulic cylinder 1 comprises a cylinder body 11 and a piston 12 which is arranged in the cylinder body 11 in a sliding manner, and the piston 12 is used for controlling the supply flow of the fuel pump; the adjusting mechanism is used for driving the piston 12 to slide in the cylinder body 11 in a reciprocating manner; the feedback mechanism is in communication connection with the adjusting mechanism and is used for detecting the position of the piston 12 and controlling the adjusting mechanism to drive the piston 12 to slide or stop driving the piston 12 according to the position information of the piston 12. The position adjusting device controls the movement of the piston 12 through the adjusting mechanism, then the feedback mechanism detects the position of the piston 12, if the adjusting mechanism does not drive the piston 12 to the target position, the feedback mechanism can feed back, and then the adjusting mechanism further drives and adjusts the piston 12 to accurately adjust the position of the piston 12, so that the stability of the device is improved.
Alternatively, the feedback mechanism includes a position sensor 7 in communication with the adjustment mechanism, the position sensor 7 including a mounting portion 71 and a detection portion 72, the mounting portion 71 being provided on an outer wall of the cylinder 11, the detection portion 72 extending into the cylinder 11 and being adapted to detect the position of the piston 12. In the use process, the adjusting mechanism is easy to restore to the balance position after being adjusted due to errors or abrasion, when the piston 12 does not reach the set target position, the control precision of the device is affected, the position of the piston 12 can be detected at any time through the position sensor 7, whether the difference between the detection value of the position sensor 7 and the target value is within the precision range or not is judged, and the adjusting mechanism is further controlled to drive and control the piston 12 according to the difference value.
Preferably, the piston 12 is provided with a sliding groove 1241 extending along the sliding direction thereof, and the detecting portion 72 is slidably engaged with the sliding groove 1241 to more precisely detect the sliding displacement of the piston 12.
Alternatively, the piston 12 includes a first sliding portion 121, a connecting portion 122, and an output portion 123, the first sliding portion 121 slidably engaging the cylinder 11 and dividing the cylinder 11 into a first hydraulic pressure chamber 100 and a second hydraulic pressure chamber 200; the connecting part 122 is connected to one end of the first sliding part 121, and the connecting part 122 is matched with the adjusting mechanism to realize the movement of the control piston 12; the output part 123 is connected to the other end of the first sliding part 121, and the output part 123 is used for controlling the supply flow rate of the fuel pump. Specifically, the position of the control piston 12 is achieved by both the overall movement of the control mechanism drive piston 12 and the feedback of the control mechanism by the movement of the connecting portion 122. Preferably, a hydraulic chamber is provided in the cylinder 11, and the first sliding portion 121 is slidably engaged with the hydraulic chamber and divides the hydraulic chamber into the first hydraulic chamber 100 and the second hydraulic chamber 200. In the present embodiment, the cylinder 11 is provided with a connection port A1 and a connection port B1, wherein the connection port A1 communicates with the first hydraulic chamber 100, and the connection port B1 communicates with the second hydraulic chamber 200.
Illustratively, the cylinder 11 further includes a balance chamber 300 in communication with the hydraulic chamber, the hydraulic chamber having a diameter greater than the diameter of the balance chamber 300 and a height greater than the height of the balance chamber 300, and the piston 12 further includes a second sliding portion 124 between the first sliding portion 121 and the connecting portion 122, the second sliding portion 124 slidably engaging the balance chamber 300 and separating the hydraulic chamber from the balance chamber 300. Further, the cylinder 11 is further provided with a connection port T, the connection port T is used for being communicated with an external low-pressure oil tank, and low-pressure oil is in the balance cavity 300. In the present embodiment, a sliding groove 1241 slidingly engaged with the detection end of the position sensor 7 is formed in the second sliding portion 124. The position sensor 7 and the connecting portion 122 of the piston 12 are both mounted in the balance chamber 300 (i.e., the low oil pressure region) of the cylinder 11, and during movement, the connection port T of the balance chamber 300 is connected to the oil tank to charge and discharge oil.
Optionally, the adjusting mechanism includes a feedback member 2 and an electrohydraulic servo assembly, one end of the feedback member 2 is pivoted with the connecting portion 122, the other end is pivoted with an external fixing member, and the feedback member 2 is convexly provided with a pressing member 21; the electrohydraulic servo assembly comprises an electromagnetic valve 3, a hydraulic valve and an adjusting piece 5, wherein the adjusting piece 5 is in abutting joint with a pressing piece 21, and the electromagnetic valve 3 and the hydraulic valve are coupled to drive the adjusting piece 5 to move so as to control the piston 12 to move. Specifically, by coupling control of the solenoid valve 3 and the hydraulic valve, the movement of the regulator 5 can be controlled more accurately, and at the same time, feedback of the solenoid valve 3 to the position sensor 7 is more sensitive and the response speed is faster.
Optionally, the hydraulic valve includes a valve body 41 and a valve core 42, and a first connection port 411, a second connection port 412 and a third connection port 413 which are communicated are formed on the valve body 41. The first connection port 411 is communicated with the first hydraulic chamber 100 (specifically, the connection port A1), the second connection port 412 is communicated with the oil pump and the second hydraulic chamber 200 (specifically, the connection port B1) through a three-way pipe, that is, the second hydraulic chamber 200 is always communicated with the oil pump, and the third connection port 413 is communicated with the low-pressure oil tank. The valve core 42 includes a sliding portion 421 and a flow portion 422 connected to each other, the sliding portion 421 is slidably engaged with the valve body 41, the diameter of the sliding portion 421 is larger than that of the flow portion 422, a blocking protrusion 4221 is protruding from the flow portion 422, and the blocking protrusion 4221 is used for blocking communication between the second connection port 412 and the third connection port 413 or communication between the second connection port 412 and the first connection port 411. The piston 12 is driven to move by a hydraulic valve.
Preferably, the first connecting port 411 and the second connecting port 412 are both disposed on a side wall of the valve body 41, the first connecting port 411 is located between the second connecting port 412 and the third connecting port 413, and the blocking protrusion 4221 is located at a middle position of the flow portion 422. Illustratively, as shown in fig. 1, the first connection port 411 is located below the second connection port 412 and above the third connection port 413, and the blocking protrusion 4221 always blocks communication between the second connection port 412 and the third connection port 413, selectively blocks communication between the first connection port 411 and the second connection port 412 or communication between the first connection port 411 and the third connection port 413. In short, when the blocking projection 4221 is located above the first connection port 411, the blocking projection 4221 may block communication between the first connection port 411 and the second connection port 412, at which time the first connection port 411 and the third connection port 413 communicate; when the blocking protrusion 4221 is located below the first connection port 411, the blocking protrusion 4221 may block communication between the first connection port 411 and the third connection port 413, at which time the first connection port 411 and the second connection port 412 communicate; when the blocking boss 4221 blocks the first connection port 411, the second connection port 412, and the third connection port 413 are not communicated with each other.
Preferably, in the hydraulic cylinder 1, the acting area of the first hydraulic chamber 100 acting on the first sliding portion 121 is larger than the acting area of the second hydraulic chamber 200 acting on the first sliding portion 121, so that when the hydraulic oil pressures in the first hydraulic chamber 100 and the second hydraulic chamber 200 are the same, the first sliding portion 121 (i.e., the piston 12) can also move in the direction of the second hydraulic chamber 200 to achieve the dynamic balance.
Specifically, in the present embodiment, when the solenoid valve 3 cooperates with the hydraulic valve to realize the downward movement of the drive spool 42, the first connection port 411 and the second connection port 412 communicate, the oil pump supplies the hydraulic oil having the pressure P from the second connection port 412 into the valve body 41, and from the connection port A1 into the first hydraulic chamber 100 via the first connection port 411, and since the second hydraulic chamber 200 communicates with the oil pump, the pressures of the first hydraulic chamber 100 and the second hydraulic chamber 200 are the same at this time, but since the area of the first hydraulic chamber 100 acting on the first sliding portion 121 is larger than the area of the second hydraulic chamber 200 acting on the first sliding portion 121, the piston 12 moves in the direction of the second hydraulic chamber 200, specifically, upward movement in fig. 1.
When the solenoid valve 3 cooperates with the hydraulic valve to realize the upward movement of the driving valve core 42, the first connection port 411 and the third connection port 413 are communicated, at this time, the first hydraulic chamber 100 is equivalent to a low-pressure oil tank connected to the third connection port 413, the second hydraulic chamber 200 is communicated with an oil pump with a pressure P, the pressure of the second hydraulic chamber 200 is greater than that of the first hydraulic chamber 100, and the first sliding portion 121 (i.e., the piston 12) moves in the direction of the first hydraulic chamber 100, specifically, downward movement in fig. 1.
Optionally, the electromagnetic valve 3 includes a connecting member 31, a first elastic member 32 and an electromagnet 33, one end of the connecting member 31 is connected with the valve core 42, the other end is connected with the adjusting member 5, and a convex ring 311 is arranged on the connecting member 31; the first elastic member 32 is compressed between the convex ring 311 and the valve body 41; the direction of the force of the electromagnet 33 acting on the connecting member 31 is opposite to the direction of the force of the first elastic member 32 acting on the connecting member 31. As shown in fig. 1, the electromagnet 33 has a downward force on the connecting member 31, so that the connecting member 31 has a downward movement tendency, and the first elastic member 32 has an upward force on the convex ring 311 of the connecting member 31, so that the connecting member 31 has an upward movement tendency, and when the two forces are balanced, the connecting member 31 is stationary. By adjusting the magnitude of the current supplied to the electromagnet 33, the force of the electromagnet 33 on the connecting member 31 can be changed, thereby realizing the movement of the driving connecting member 31.
Preferably, the electro-hydraulic servo assembly further comprises a second elastic member 6, the second elastic member 6 being compressed between the connecting member 31 and the adjustment member 5 for holding the adjustment member 5 in abutment with the compression element 21. The second elastic member 6 ensures that the adjusting member 5 is elastically connected to the connecting member 31, so that the adjusting member 5 is held in abutment with the pressing member 21.
Illustratively, in the present embodiment, the spool 42 and the connecting piece 31 are an integrally formed structure. Of course, in other embodiments, the valve core 42 and the connecting member 31 may be of a separate design and fixedly connected by a fixing member.
Working principle of electrohydraulic servo assembly: the electromagnet 33 generates a downward electromagnetic force on the connecting piece 31, the electromagnetic force can be indirectly transmitted to the adjusting piece 5 through the second elastic piece 6, the first elastic piece 32 generates an upward first elastic force on the connecting piece 31, the first elastic force can indirectly transmit the adjusting piece 5 through the second elastic piece 6, and the second elastic piece 6 simultaneously generates an upward second elastic force on the adjusting piece 5; when the electromagnetic force F1 and the pressure are equal to the sum F2 of the first elastic force and the second elastic force, the valve core 42 is kept stable, when the electromagnetic force F1 is larger than the sum F2 of the first elastic force and the second elastic force, the valve core 42 moves downwards, the first connecting port 411 is communicated with the second connecting port 412, the piston 12 moves upwards, the feedback piece 2 rotates upwards, the second elastic piece 6 stretches to enable F2 to be equal to F1, and the valve core 42 reaches a new stress balance; when the electromagnetic force F1 is smaller than the sum F2 of the first elastic force and the second elastic force, the valve core 42 moves upwards, the first connecting port 411 is communicated with the third connecting port 413, the piston 12 moves downwards, and when the feedback member 2 rotates downwards, the protrusion 21 on the feedback member 2 generates a downward pressure on the adjusting member 5, the second elastic member 6 compresses to enable the F2 to be equal to the F1, and the valve core 42 reaches a new stress balance.
For easy understanding, the working principle of the position control device provided in this embodiment is as follows:
the position control device comprises a main regulator and a micro regulator, wherein the main regulator is the regulation of the regulating mechanism, the micro regulator is the regulation of the regulating mechanism through the cooperation of the feedback mechanism, and the regulation is carried out through a double closed loop mode, so that the stability is better and the precision is higher.
The main regulation process is as follows: the first elastic member 32 and the second elastic member 6 are coupled to generate an upward elastic force to the adjusting member 5, the electromagnet 33 generates a downward electromagnetic force to the adjusting member 5, and when the electromagnetic force and the elastic force are balanced, the blocking protrusion 4221 on the valve core 42 blocks the first connection port 411.
When the downward electromagnetic force is greater than the upward elastic force, the connecting member 31 drives the valve core 42 to move downward, the pressure oil with the pressure P enters the valve body 41 through the second connecting port 412 of the valve body 41 and flows out of the valve body 41 from the first connecting port 411, the pressure oil enters the first hydraulic chamber 100 (lower end) of the cylinder 11 through the connecting port A1, the second hydraulic chamber 200 is kept in communication with the oil pump, and the pressure of the second hydraulic chamber 200 is the same as that of the first hydraulic chamber 100, at this time, since the acting area of the first sliding portion 121 of the first hydraulic chamber 100 (lower end) acting on the piston 12 is greater than that of the first sliding portion 121 of the second hydraulic chamber 200 (upper end) acting on the piston 12, the piston 12 moves upward; the upward movement of the piston 12 can lift the end of the feedback member 2 upward through the connecting portion 122, the pressing member 21 on the feedback member 2 moves upward without pressing the adjusting member 5, the adjusting member 5 moves upward under the action of the second elastic member 6, the upward elastic force is indirectly increased, the connecting member 31 and the valve core 42 move upward, when the upward elastic force is equal to the downward electromagnetic force, the connecting member 31 and the valve core 42 return to the middle balance position again, and the communication between the first connecting port 411 and the second connecting port 412 is cut off.
When the downward electromagnetic force is smaller than the upward elastic force, the valve core 42 moves upward, the first connecting port 411 is communicated with the third connecting port 413, the connecting port A1 of the first hydraulic cavity 100 (lower end) of the cylinder body 11 is communicated with the oil tank through the third connecting port 413 via the first connecting port 411 of the valve body 41, the pressure oil with the pressure P enters the second hydraulic cavity 200 (upper end) via the connecting port B1 of the cylinder body 11, the pressure of the second hydraulic cavity 200 is larger than the pressure of the first hydraulic cavity 100, the piston 12 moves downward, the end part of the feedback member 2 is driven to rotate downward by the connecting part 122, the pressing piece 21 on the feedback member 2 further abuts against the regulating member 5, the regulating member 5 moves downward, the second elastic member 6 is compressed, the upward elastic force is reduced, the valve core 42 moves downward, when the upward elastic force is equal to the downward electromagnetic force, the valve core 42 returns to the middle balance position again, and the passage between the first connecting port 411 and the third connecting port 413 is cut off. When the output portion 123 of the piston 12 gradually approaches the target position, the adjustment is more stable due to the gradual closing of the first connection port 411 of the valve body 41.
Micro-regulation: the position sensor 7 detects the displacement of the piston 12 in real time. When the spool 42 returns to the neutral balance position again due to an error or wear, the position control of the output end of the piston 12 does not reach the set target value, i.e., the detection value of the position sensor 7 and the target value are not within the accuracy range, the given current of the electromagnet 33 can be finely adjusted according to the magnitude of the difference value, so that the position of the output portion 123 of the piston 12 reaches the demand.
The embodiment also provides a speed regulating system of the fuel pump of the diesel engine, which comprises the position control device, and can stably and accurately regulate the supply flow of the fuel pump and improve the speed control capability of the diesel engine.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (7)
1. A position control device for controlling a supply flow rate of a fuel pump; the position control device is characterized by comprising:
a hydraulic cylinder (1) comprising a cylinder body (11) and a piston (12) slidably arranged in the cylinder body (11), the piston (12) being used for controlling the supply flow of a fuel pump;
an adjusting mechanism for driving the piston (12) to slide reciprocally in the cylinder (11);
the feedback mechanism is in communication connection with the adjusting mechanism and is used for detecting the position of the piston (12), and controlling the adjusting mechanism to drive the piston (12) to slide or stop driving the piston (12) according to the position information of the piston (12);
the piston (12) comprises:
a first sliding part (121) which is slidingly engaged with the cylinder (11) and divides the cylinder (11) into a first hydraulic chamber (100) and a second hydraulic chamber (200);
a connecting part (122) connected to one end of the first sliding part (121), wherein the adjusting mechanism is matched with the connecting part (122) to control the movement of the piston (12); an output unit (123) connected to the other end of the first sliding unit (121), the output unit (123) being configured to control a supply flow rate of the fuel pump;
the adjustment mechanism includes:
one end of the feedback piece (2) is pivoted with the connecting part (122), the other end of the feedback piece is pivoted with the external fixing piece, and the feedback piece (2) is convexly provided with a pressing piece (21);
the electrohydraulic servo assembly comprises an electromagnetic valve (3), a hydraulic valve and an adjusting piece (5), wherein the adjusting piece (5) is in abutting connection with the pressing piece (21), and the electromagnetic valve (3) is coupled with the hydraulic valve to drive the adjusting piece (5) to move so as to control the piston (12) to move;
the action area of the first hydraulic cavity (100) on the first sliding part (121) is larger than the action area of the second hydraulic cavity (200) on the first sliding part (121); the hydraulic valve includes: the valve body (41) is provided with a first connecting port (411), a second connecting port (412) and a third connecting port (413) which are communicated, the first connecting port (411) is communicated with the first hydraulic cavity (100), the oil pump is respectively communicated with the second connecting port (412) and the second hydraulic cavity (200) through a three-way pipe, and the third connecting port (413) is communicated with an oil tank; the valve core (42) comprises a sliding part (421) and a circulating part (422) which are connected, the sliding part (421) is in sliding fit with the valve body (41), the diameter of the sliding part (421) is larger than that of the circulating part (422), a blocking protrusion (4221) is arranged on the circulating part (422) in a protruding mode, the blocking protrusion (4221) is used for always blocking communication between the second connecting port (412) and the third connecting port (413), and selectively blocking communication between the first connecting port (411) and the second connecting port (412) or communication between the first connecting port (411) and the third connecting port (413).
2. The position control device according to claim 1, characterized in that the first connection port (411) and the second connection port (412) are both provided on a side wall of the valve body (41), the first connection port (411) is located between the second connection port (412) and the third connection port (413), and the blocking protrusion (4221) is located at an intermediate position of the flow-through portion (422).
3. The position control device according to claim 1, characterized in that the solenoid valve (3) comprises:
a connecting piece (31) with one end connected with the valve core (42) and the other end connected with the adjusting piece (5), wherein a convex ring (311) is arranged on the connecting piece (31);
a first elastic member (32) compressed between the convex ring (311) and the valve body (41);
an electromagnet (33) acts on the connecting piece (31) in a direction opposite to the direction of the acting force of the first elastic piece (32) on the connecting piece (31).
4. A position control device according to claim 3, characterized in that the electrohydraulic servo assembly further comprises a second elastic member (6), the second elastic member (6) being compressed between the connecting member (31) and the regulating member (5) for holding the regulating member (5) in abutment with the pressing member (21).
5. A position control device according to any one of claims 1-4, characterized in that the feedback mechanism comprises a position sensor (7) in communication with the adjustment mechanism, the position sensor (7) comprising a mounting portion (71) and a detection portion (72), the mounting portion (71) being provided on an outer wall of the cylinder (11), the detection portion (72) extending into the cylinder (11) and being arranged to detect the position of the piston (12).
6. The position control device according to claim 5, characterized in that the piston (12) is provided with a sliding groove (1241) extending along the sliding direction thereof, and the detecting portion (72) is in sliding fit with the sliding groove (1241).
7. A diesel engine fuel pump speed regulation system comprising a position control device as claimed in any one of claims 1 to 6.
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| CN202111461123.1A CN114135475B (en) | 2021-11-30 | 2021-11-30 | Position control device and diesel engine fuel pump speed regulation system |
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| CN202111461123.1A CN114135475B (en) | 2021-11-30 | 2021-11-30 | Position control device and diesel engine fuel pump speed regulation system |
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| CN114135475B true CN114135475B (en) | 2024-01-30 |
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| CN106414993A (en) * | 2014-04-16 | 2017-02-15 | Fca美国有限责任公司 | Variable stroke direct injection fuel pump system and computer-implemented method to operate the system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102011122366A1 (en) * | 2011-12-23 | 2013-06-27 | Robert Bosch Gmbh | Pressure control arrangement with pressure control valve and hydraulic circuit with it |
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| JPH07233782A (en) * | 1993-04-12 | 1995-09-05 | Toyota Autom Loom Works Ltd | Hydraulic system |
| JPH0849659A (en) * | 1994-08-05 | 1996-02-20 | Hitachi Constr Mach Co Ltd | Hydraulic pump flow control device |
| CN1292454A (en) * | 1999-07-02 | 2001-04-25 | 艾拉西斯·西斯特玛·里瑟卡·菲亚特·耐尔·麦兹奥吉奥尔诺有限公司 | Equipment for regulating transfer pressure of pump providing fuel for internal combustion engine |
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| Publication number | Publication date |
|---|---|
| CN114135475A (en) | 2022-03-04 |
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