CN114135475A - Position control device and diesel engine fuel pump speed regulating system - Google Patents
Position control device and diesel engine fuel pump speed regulating system Download PDFInfo
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- CN114135475A CN114135475A CN202111461123.1A CN202111461123A CN114135475A CN 114135475 A CN114135475 A CN 114135475A CN 202111461123 A CN202111461123 A CN 202111461123A CN 114135475 A CN114135475 A CN 114135475A
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- 239000000446 fuel Substances 0.000 title claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 title abstract description 8
- 230000007246 mechanism Effects 0.000 claims abstract description 45
- 238000004891 communication Methods 0.000 claims abstract description 20
- 230000008713 feedback mechanism Effects 0.000 claims abstract description 18
- 230000000903 blocking effect Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 9
- 230000001276 controlling effect Effects 0.000 abstract description 11
- 239000003921 oil Substances 0.000 description 18
- 238000009434 installation Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 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
- 238000007599 discharging Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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 diesel engine fuel pump speed regulating system. 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 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 body 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 position of the piston is detected through the feedback mechanism, if the adjusting mechanism does not drive the piston to the target position, the feedback mechanism can carry out feedback, and then the adjusting mechanism further drives and adjusts the piston, so that the position of the piston is accurately adjusted, 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 diesel engine fuel pump speed regulating system.
Background
The diesel engine is governed primarily by regulating 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 advanced from a mechanical type and an electronic type, and the precision, the stability and the responsiveness are all rapidly improved. However, the mechanical adjustment 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, a position control device with high stability and high precision is needed to solve the above problems.
Disclosure of Invention
An object of the present invention is to provide a position control device having better stability and higher accuracy of position control.
Another object of the present invention is to provide a speed control system for a fuel pump of a diesel engine, which can stably and accurately adjust the supply flow rate of the fuel pump by using the position control device, thereby improving the speed control capability of the diesel engine.
In order to realize the purpose, the following technical scheme is provided:
in one aspect, a position control apparatus is provided for controlling a supply flow rate of a fuel pump; the position control device includes:
the hydraulic cylinder comprises a cylinder body and a piston arranged in the cylinder body in a sliding mode, 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 body 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 comprises:
a first sliding portion that is slidably engaged with the cylinder and divides the cylinder into a first hydraulic pressure chamber and a second hydraulic pressure 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 to the other end of the first sliding part and is used for controlling the supply flow of the fuel pump.
As an alternative of the position control apparatus, an acting area of the first hydraulic pressure chamber acting on the first sliding portion is larger than an acting area of the second hydraulic pressure chamber acting on the first sliding portion. When the pressure of the first hydraulic pressure chamber is equal to the pressure of the second hydraulic pressure chamber, the first slide portion moves in the direction of the second hydraulic pressure chamber.
As an alternative to the position control apparatus, the adjustment 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 a pressing piece is arranged on the feedback piece in a protruding mode;
the electro-hydraulic servo assembly comprises an electromagnetic valve, a hydraulic valve and an adjusting piece, wherein the adjusting piece is abutted against 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 comprises:
the valve body is provided with a first connecting port, a second connecting port and a third connecting port which are communicated, 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 which are connected, the sliding part is in sliding fit with the valve body, the diameter of the sliding part is larger than that of the circulating part, a blocking bulge is arranged on the circulating part in a protruding mode, the blocking bulge always blocks communication between the second connecting port and the third connecting port, and communication between the first connecting port and the second connecting port or communication between the first connecting port and the third connecting port is selectively blocked.
As an alternative of the position control device, the first connection port and the second connection port are both provided on the side wall of the valve body, the first connection port is located between the second connection port and the third connection port, and the blocking protrusion is located at an intermediate position of the flow portion.
As an alternative to the position control device, when the blocking protrusion is located below the first connection port, the first connection port is communicated with the second connection port, and at this time, the pressure of the first hydraulic pressure chamber is equal to the pressure of the second hydraulic pressure chamber, and since the acting area of the second hydraulic pressure chamber acting on the first sliding portion is smaller than the acting area of the first hydraulic pressure chamber acting on the first sliding portion, the piston moves in the direction of the second hydraulic pressure chamber; when the blocking protrusion is located above the first connection port, the first connection port is communicated with the third connection port, the pressure of the first hydraulic cavity is smaller than that of the second hydraulic cavity, and the piston moves towards 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 apparatus, 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 acting on the connecting piece is opposite to the direction of the acting force acting on the connecting piece by the first elastic piece.
As an alternative to the position control device, the electro-hydraulic servo assembly further includes a second elastic member compressed between the link member and the adjusting member for holding the adjusting member in abutment with the pressing member.
As an alternative of the position control device, the feedback mechanism includes a position sensor in communication connection with the adjusting mechanism, the position sensor includes an installation part and a detection part, the installation part is arranged on the outer wall of the cylinder body, and the detection part extends into the cylinder body and is used for detecting the position of the piston.
As an alternative of the position control device, the piston is provided with a sliding groove extending along a sliding direction of the piston, and the detecting portion is in sliding fit with the sliding groove.
In a second aspect, there is provided a diesel engine fuel pump governor system including a position control apparatus as described above.
Compared with the prior art, the invention has the beneficial effects that:
the position control device comprises a hydraulic cylinder, an adjusting mechanism and a feedback mechanism, wherein the hydraulic cylinder comprises a cylinder body and a piston 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 body 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 position of the piston is detected through the feedback mechanism, if the adjusting mechanism does not drive the piston to the target position, the feedback mechanism can carry out feedback, and then the adjusting mechanism further drives and adjusts the piston, so that the position of the piston is accurately adjusted, and the stability of the device is improved.
The diesel engine fuel pump speed regulating system provided by the invention can stably and accurately regulate the supply flow of the fuel pump by applying the position control device, and improve the speed control capability of the diesel engine.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a position control apparatus according to an embodiment of the present invention.
Reference numerals:
1. a hydraulic cylinder; 11. a cylinder body; 12. a piston; 121. a first sliding section; 122. a connecting portion; 123. an output section; 124. a second sliding section; 1241. a chute;
2. a feedback member; 21. pressing parts;
3. an electromagnetic valve; 31. a connecting member; 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 circulation section; 4221. plugging the protrusion;
5. an adjustment member;
6. a second elastic member;
7. a position sensor; 71. an installation part; 72. a detection unit;
100. a first hydraulic chamber; 200. a second hydraulic chamber; 300. a balancing chamber.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of 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 present invention, 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally placed when the products of the present invention are used, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements to be referred to must have specific orientations, be constructed in specific orientations, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1, the present embodiment provides a position control device that can be used to control the supply flow rate of a fuel pump with 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 arranged in the cylinder body 11 in a sliding mode, 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 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 position of the piston 12 is detected through the feedback mechanism, if the adjusting mechanism does not drive the piston 12 to the target position, the feedback mechanism can carry out feedback, and then the adjusting mechanism further drives and adjusts the piston 12, so that the position of the piston 12 is accurately adjusted, and the stability of the device is improved.
Alternatively, the feedback mechanism includes a position sensor 7 communicatively connected to the adjustment mechanism, the position sensor 7 includes a mounting portion 71 and a detection portion 72, the mounting portion 71 is disposed on an outer wall of the cylinder 11, and the detection portion 72 extends into the cylinder 11 and is configured to detect a position of the piston 12. During the use, because error or wearing and tearing easily cause the adjustment mechanism to restore to the equilibrium position after adjusting, when piston 12 does not reach the target position of setting for the control accuracy of influence device, and through setting up position sensor 7, can detect the position of piston 12 constantly, and judge whether the difference between the detected value of position sensor 7 and the target value is in the precision range, thereby further control adjustment mechanism carries out drive control to piston 12 according to the looks difference value.
Preferably, the piston 12 is provided with a slide groove 1241 extending along the sliding direction thereof, and the detecting portion 72 is in sliding fit with the slide groove 1241 to detect the sliding displacement of the piston 12 more accurately.
Alternatively, the piston 12 includes a first sliding portion 121, a connecting portion 122, and an output portion 123, the first sliding portion 121 being slidably engaged with the cylinder 11 and dividing the cylinder 11 into the first hydraulic pressure chamber 100 and the second hydraulic pressure chamber 200; the connecting portion 122 is connected to one end of the first sliding portion 121, and the connecting portion 122 is matched with the adjusting mechanism to control the movement of the 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 piston 12 can be controlled by the adjustment mechanism through the integral movement of the piston 12 driven by the adjustment mechanism and the feedback of the movement of the connecting portion 122 to the adjustment mechanism. Preferably, a hydraulic pressure chamber is provided in the cylinder 11, and the first sliding portion 121 is slidably engaged with the hydraulic pressure chamber and divides the hydraulic pressure chamber into the first hydraulic pressure chamber 100 and the second hydraulic pressure chamber 200. In the present embodiment, the cylinder 11 has a connection port a1 and a connection port B1, where 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 has a balance chamber 300 communicating with the hydraulic chamber, the hydraulic chamber has a diameter larger than that of the balance chamber 300 and a height larger than that 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 being slidably engaged with the balance chamber 300 and separating the hydraulic chamber from the balance chamber 300. Furthermore, a connecting port T is further formed in the cylinder body 11, the connecting port T is used for being communicated with an external low-pressure oil tank, and low-pressure oil is filled in the balance cavity 300. In the present embodiment, the second sliding portion 124 is provided with a slide groove 1241 which is slidably engaged with the detection end of the position sensor 7. The position sensor 7 and the connecting portion 122 of the piston 12 are both installed in a balance chamber 300 (i.e., a low oil pressure region) of the cylinder 11, and during the movement, a connecting port T of the balance chamber 300 is connected to an oil tank to perform oil charging and discharging.
Optionally, the adjusting mechanism includes a feedback member 2 and an electro-hydraulic servo assembly, one end of the feedback member 2 is pivoted with the connecting portion 122, the other end of the feedback member is pivoted with the external fixing member, and a pressing member 21 is arranged on the feedback member 2 in a protruding manner; the electro-hydraulic servo assembly comprises an electromagnetic valve 3, a hydraulic valve and an adjusting piece 5, wherein the adjusting piece 5 is abutted against 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. Specifically, through the coupling control of the solenoid valve 3 and the hydraulic valve, the movement of the adjusting member 5 can be controlled more accurately, and meanwhile, the solenoid valve 3 is more sensitive to the feedback of the position sensor 7 and has faster response speed.
Optionally, the hydraulic valve includes a valve body 41 and a valve core 42, and the valve body 41 is provided with a first connection port 411, a second connection port 412 and a third connection port 413 which are communicated with each other. 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 body 42 includes a sliding portion 421 and a flow portion 422 connected to each other, the sliding portion 421 is slidably fitted to the valve body 41, a diameter of the sliding portion 421 is larger than a diameter of the flow portion 422, a blocking boss 4221 is provided on the flow portion 422 in a protruding manner, and the blocking boss 4221 is used to block 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 connection port 411 and the second connection port 412 are both provided on the 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 boss 4221 is located at an intermediate position of the circulation part 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 the communication between the second connection port 412 and the third connection port 413, and selectively blocks the communication between the first connection port 411 and the second connection port 412 or the communication between the first connection port 411 and the third connection port 413. In short, when the blocking protrusion 4221 is located above the first connection port 411, the blocking protrusion 4221 may block the communication between the first connection port 411 and the second connection port 412, and the first connection port 411 and the third connection port 413 are communicated; when the blocking protrusion 4221 is located below the first connection port 411, the blocking protrusion 4221 may block the communication between the first connection port 411 and the third connection port 413, and at this time, the first connection port 411 and the second connection port 412 are communicated; when the blocking protrusion 4221 blocks the first connection port 411, the second connection port 412 and the third connection port 413 are not communicated with each other.
In the hydraulic cylinder 1, the acting area of the first hydraulic pressure chamber 100 acting on the first sliding part 121 is preferably larger than the acting area of the second hydraulic pressure chamber 200 acting on the first sliding part 121, so that when the hydraulic oil pressures in the first hydraulic pressure chamber 100 and the second hydraulic pressure chamber 200 are the same, the first sliding part 121 (i.e., the piston 12) can also move towards the second hydraulic pressure chamber 200 to achieve power balance.
Specifically, in the present embodiment, when the electromagnetic valve 3 cooperates with the hydraulic valve to realize downward movement of the valve plug 42, the first connection port 411 and the second connection port 412 are communicated, the hydraulic oil with pressure P provided by the oil pump enters the valve body 41 from the second connection port 412, and enters the first hydraulic chamber 100 from the connection port a1 via the first connection port 411, and since the second hydraulic chamber 200 is communicated with the oil pump, the pressures of the first hydraulic chamber 100 and the second hydraulic chamber 200 are the same, but since the acting area of the first hydraulic chamber 100 on the first sliding portion 121 is larger than the acting area of the second hydraulic chamber 200 on the first sliding portion 121, the piston 12 moves toward the second hydraulic chamber 200, specifically upward movement in fig. 1.
When the electromagnetic valve 3 cooperates with the hydraulic valve to realize the upward movement of the valve core 42, the first connection port 411 is communicated with the third connection port 413, at this time, the first hydraulic chamber 100 is equivalent to a low-pressure oil tank connected with 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 the pressure 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, moves downward 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 to the valve core 42, and the other end is connected to the adjusting member 5, and a convex ring 311 is disposed 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 on the connecting member 31 is opposite to the direction of the force of the first elastic member 32 on the connecting member 31. As shown in fig. 1, the electromagnet 33 exerts a downward force on the connecting member 31 to make the connecting member 31 tend to move downward, and the first elastic member 32 exerts an upward force on the convex ring 311 of the connecting member 31 to make the connecting member 31 tend to move upward, so that the connecting member 31 is stationary when the two forces are balanced. By adjusting the current supplied to the electromagnet 33, the acting force of the electromagnet 33 on the connecting piece 31 can be changed, so that the connecting piece 31 is driven to move.
Preferably, 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 adjusting member 5 for maintaining the adjusting member 5 in abutment with the pressing member 21. The second elastic element 6 ensures the elastic connection of the adjusting element 5 to the connecting element 31, keeping the adjusting element 5 in abutment with the pressure element 21.
Illustratively, in the present embodiment, the valve body 42 and the connecting member 31 are of an integrally molded structure. Of course, in other embodiments, the valve core 42 and the connecting member 31 may be designed as separate bodies and fixedly connected by a fixing member.
The working principle of the electro-hydraulic servo assembly is as follows: 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 be indirectly transmitted to the adjusting piece 5 through the second elastic piece 6, and the second elastic piece 6 also 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 greater 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 extends to enable the F2 to be equal to the F1, and the valve core 42 achieves new stress balance; when the electromagnetic force F1 is smaller than the sum of the first elastic force and the second elastic force F2, the valve element 42 moves upward, the first connection port 411 is communicated with the third connection port 413, the piston 12 moves downward, when the feedback member 2 rotates downward, the protrusion 21 on the feedback member 2 generates a downward pressure on the adjusting member 5, the second elastic member 6 compresses to make F2 equal to F1, and the valve element 42 reaches a new force balance.
For convenience of understanding, the working principle of the position control device provided by the embodiment is as follows:
the position control device comprises a main adjusting part and a fine adjusting part, the main adjusting part is used for adjusting the adjusting mechanism, the fine adjusting part is used for adjusting the adjusting mechanism through the cooperation of a feedback mechanism, and the adjusting mechanism is adjusted through a double closed-loop mode, so that the stability is better, and the precision is higher.
The main adjusting process comprises the following steps: the first elastic element 32 and the second elastic element 6 are coupled to generate an upward elastic force on the adjusting element 5, the electromagnet 33 generates a downward electromagnetic force on the adjusting element 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 element 42 to move downward, the pressure oil with the pressure P enters the valve body 41 through the second connection port 412 of the valve body 41 and flows out of the valve body 41 from the first connection port 411, enters the first hydraulic pressure chamber 100 (lower end) of the cylinder 11 through the connection port a1, the second hydraulic pressure chamber 200 is communicated with the oil pump, and the pressure of the second hydraulic pressure chamber 200 is the same as that of the first hydraulic pressure chamber 100, at this time, since the acting area of the first hydraulic pressure chamber 100 (lower end) acting on the first sliding portion 121 of the piston 12 is greater than that of the second hydraulic pressure chamber 200 (upper end) acting on the first sliding portion 121 of the piston 12, the piston 12 moves upward; when the upward elastic force is equal to the downward electromagnetic force, the connecting element 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 element 42 moves upward, the first connection port 411 is communicated with the third connection port 413, the connection port a1 of the first hydraulic chamber 100 (lower end) of the cylinder 11 is communicated with the oil tank through the first connection port 411 of the valve body 41 through the third connection port 413, the pressure oil with the pressure P enters the second hydraulic chamber 200 (upper end) through the connection port B1 of the cylinder 11, the pressure of the second hydraulic chamber 200 is larger than the pressure of the first hydraulic chamber 100, the piston 12 moves downward, and then the end of the feedback member 2 is driven to rotate downward through the connection portion 122, the pressing member 21 on the feedback member 2 further presses against the adjusting member 5, so that the adjusting member 5 moves downward, the second elastic member 6 is compressed, the upward elastic force is reduced, the valve element 42 moves downward, when the upward elastic force is equal to the downward electromagnetic force, and the valve element 42 returns to the middle balance position again, the first connection port 411 and the third connection port 413 are cut off. The adjustment is more stable due to the gradual closing of the first connection port 411 of the valve body 41 when the output portion 123 of the piston 12 gradually approaches the target position.
Micro-adjusting: the position sensor 7 detects the displacement of the piston 12 in real time. When the spool 42 returns to the neutral equilibrium position again due to an error or wear, and the position control of the output end of the piston 12 does not reach the set target value, that is, the detection value and the target value of the position sensor 7 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 requirement.
The embodiment also provides a speed regulating system of a fuel pump of a 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.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A position control device for controlling a supply flow rate of a fuel pump; characterized in that the position control device comprises:
the hydraulic cylinder (1) comprises a cylinder body (11) and a piston (12) arranged in the cylinder body (11) in a sliding mode, wherein the piston (12) is used for controlling the supply flow of a fuel pump;
the adjusting mechanism is used for driving the piston (12) to slide in the cylinder body (11) 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 (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).
2. Position control device according to claim 1, characterized in that the piston (12) comprises:
a first sliding section (121) that is slidably fitted to the cylinder (11) and that divides the cylinder (11) into a first hydraulic chamber (100) and a second hydraulic chamber (200);
the connecting part (122) is connected to one end of the first sliding part (121), and the adjusting mechanism is matched with the connecting part (122) to control the piston (12) to move;
and an output part (123) connected to the other end of the first sliding part (121), wherein the output part (123) is used for controlling the supply flow of the fuel pump.
3. The position control apparatus according to claim 2, wherein the adjustment mechanism comprises:
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 a pressing piece (21) is arranged on the feedback piece (2) in a protruding mode;
the electro-hydraulic servo assembly comprises an electromagnetic valve (3), a hydraulic valve and an adjusting piece (5), wherein the adjusting piece (5) is abutted to the 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.
4. The position control apparatus according to claim 3, characterized in that an acting area of the first hydraulic pressure chamber (100) on the first sliding portion (121) is larger than an acting area of the second hydraulic pressure chamber (200) on the first sliding portion (121); the hydraulic valve includes:
the hydraulic control valve comprises a valve body (41), a first connecting port (411), a second connecting port (412) and a third connecting port (413) which are communicated with each other are formed in the valve body, the first connecting port (411) is communicated with a first hydraulic cavity (100), an oil pump is respectively communicated with the second connecting port (412) and a second hydraulic cavity (200) through a three-way pipe, and the third connecting port (413) is communicated with an oil tank;
the valve element (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 bulge (4221) is arranged on the circulating part (422) in a protruding mode, the blocking bulge (4221) always blocks communication between the second connecting port (412) and the third connecting port (413), and 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) is selectively blocked.
5. The position control device according to claim 4, characterized in that the first connection port (411) and the second connection port (412) are 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 portion (422).
6. Position control device according to claim 4, characterized in that the solenoid valve (3) comprises:
one end of the connecting piece (31) is connected with the valve core (42), the other end of the connecting piece is connected with the adjusting piece (5), and 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);
and the direction of the acting force acting on the connecting piece (31) is opposite to the direction of the acting force acting on the connecting piece (31) by the first elastic piece (32).
7. Position control device according to claim 6, characterized in that 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 adjusting member (5) for keeping the adjusting member (5) in abutment with the pressing member (21).
8. A position control arrangement according to any one of claims 1-7, characterized in that the feedback mechanism comprises a position sensor (7) in communicative connection 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 adapted to detect the position of the piston (12).
9. The position control device according to claim 8, wherein the piston (12) is provided with a slide groove (1241) extending along a sliding direction thereof, and the detecting portion (72) is slidably engaged with the slide groove (1241).
10. A diesel engine fuel pump timing system including a position control apparatus as claimed in any one of claims 1 to 9.
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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 CN114135475B (en) | 2024-01-30 |
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| Publication number | Publication date |
|---|---|
| CN114135475B (en) | 2024-01-30 |
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