CN101260840A - Fuel-feed system control device and method - Google Patents
Fuel-feed system control device and method Download PDFInfo
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- CN101260840A CN101260840A CNA2008101047279A CN200810104727A CN101260840A CN 101260840 A CN101260840 A CN 101260840A CN A2008101047279 A CNA2008101047279 A CN A2008101047279A CN 200810104727 A CN200810104727 A CN 200810104727A CN 101260840 A CN101260840 A CN 101260840A
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Abstract
The invention discloses a device and a method for controlling a fuel supply system, and the device is applicable to a hydraulic free-piston engine, wherein, a piston position detection module is connected with a piston and a signal control module respectively for detecting the position of the piston and transmitting a position signal of the piston to the signal control module; the signal control module is connected with a drive module for processing the position signal of the piston and transmitting a corresponding control signal to the drive module; and the drive module is connected with an electromagnetic valve for outputting control current to complete the on/off of the electromagnetic valve. With the adoption of the technical proposal of the invention, the control of injection timing and fuel delivery can be accurately realized, and the closed-loop control can be performed to the fuel delivery to guarantee that the lower dead point of the piston of the hydraulic free-piston engine has an accurate position, so that the hydraulic free-piston engine can have a stable functional mode.
Description
Technical field
The present invention relates to technical field of engines, relate in particular to a kind of control gear and method of oil supply system.
Background technique
Traditional pump nozzle oil supply system is that engine crankshaft rotates the Injection Pump work that promotes by the cam on the fuel cam axle of a pair of fuel injection timing gear drive.In the oil supply system of this structure, oil spout is to guarantee by the cam profile on timing gear and the camshaft constantly, and fuel injection characteristic guarantees that by cam profile fuel injection quantity is to be determined by the position of plunger pull bar drive plunger skewed slot in the Injection Pump.
Hydraulic free-piston engine is a kind of novel engine that stroke piston combustion engine and pluger type hydraulic pump are become one.This motor is that the to-and-fro motion with piston can drive loaded work piece by being converted into hydraulic pressure with the rigidly connected hydraulic plunger of piston.Be with traditional crank engine main difference point structurally: this motor has not had connecting rod, has not promptly had rotating machinery.Owing to do not had rotating machinery, the oil supply system of this kind motor to adopt hydraulically powered oil supply system to realize the fuel delivery of hydraulic free-piston engine.In order to realize accurate control to this oil supply system, need to adopt a kind of hydraulic driving control system, realize the accurate control of oil supply system injection timing and fuel injection quantity.
Summary of the invention
The objective of the invention is to propose a kind of control gear and method of oil supply system, be applicable to hydraulic free-piston engine, can realize the accurate control of oil supply system injection timing and fuel injection quantity.
For reaching this purpose, the present invention by the following technical solutions:
A kind of control gear of oil supply system, be applicable to hydraulic free-piston engine, comprise the piston position testing module, SC sigmal control module and driver module, described piston position testing module is connected with described SC sigmal control module with the piston of described hydraulic free-piston engine respectively, be used to detect described piston position, and described position of piston signal sent to described SC sigmal control module, described SC sigmal control module is connected with described driver module, be used to handle described position of piston signal, and control signal corresponding sent to described driver module, described driver module is connected with the solenoid valve of described hydraulic free-piston engine, is used to export the switch that the control electric current is finished described solenoid valve.
Described piston position testing module further comprises displacement transducer, signal processing circuit and A/D converter, described displacement transducer, signal processing circuit is connected successively with A/D converter, described displacement transducer is connected with described piston, be used to obtain the displacement signal of described piston, and described displacement signal sent to described signal processing circuit, described signal processing circuit is used for described displacement signal is carried out voltage follow, impedence matching, and voltage signal sent to described A/D converter, described A/D converter is connected with described SC sigmal control module, be used for converting described voltage signal to digital signal, and send to described SC sigmal control module.
Described displacement transducer is a LVDT formula displacement transducer, and the connecting rod of described LVDT formula displacement transducer is connected with the end of described piston by screw thread, and moves with described piston.
A kind of controlling method of oil supply system is applicable to hydraulic free-piston engine, may further comprise the steps:
A, piston position testing module detect the piston position of described hydraulic free-piston engine, and described position of piston signal is sent to described SC sigmal control module;
B, described SC sigmal control module are judged described position of piston signal, when described position signal corresponds to described hydraulic free-piston engine Injection Pump commencement of fuel injection, then export the control signal of default duration and give driver module;
C, described driver module are according to the control signal that receives, and output control electric current is opened solenoid valve, drives described Injection Pump oil spout;
D, described control signal are turn-offed, described closed electromagnetic valve, and described Injection Pump stops oil spout;
E, repeating step A are to step D, and in step B, described SC sigmal control module compares the lower dead center value and the predefined lower dead center value of described position of piston signal, and according to comparative result, adjusts the default duration of described control signal.
Steps A further may further comprise the steps:
Displacement transducer detects the piston position of described hydraulic free-piston engine, obtains the displacement signal of described piston, and sends to signal processing circuit;
Described signal processing circuit is carried out voltage follow, impedence matching to described displacement signal, and voltage signal is sent to A/D converter;
Described A/D converter is converted to digital signal to described voltage signal, and sends to described SC sigmal control module.
In the step e, when the lower dead center value of described position of piston signal greater than predefined lower dead center value, described SC sigmal control module shortens the default duration of control signal described in the step B.
In the step e, when the lower dead center value of described position of piston signal less than predefined lower dead center value, described SC sigmal control module prolongs the default duration of control signal described in the step B.
Described predefined lower dead center value is the mid point of described piston lower dead center scope.
Adopted technological scheme of the present invention, come the driven pump nozzle oil supply system by electronic control hydraulic pressure, can realize the control of injection timing and fuel delivery accurately, and can carry out closed loop control to fuel delivery, the piston B.D.C position that guarantees hydraulic free-piston engine is accurate, makes the hydraulic free-piston engine stable working state.
Description of drawings
Fig. 1 is the structural representation of the control gear of oil supply system in the specific embodiment of the invention;
Fig. 2 is the flow chart of the controlling method of oil supply system in the specific embodiment of the invention.
Embodiment
Further specify technological scheme of the present invention below in conjunction with accompanying drawing and by embodiment.
The main thought of technical solution of the present invention is based on the piston position signal of hydraulic free-piston engine, control is connected on opening constantly of solenoid valve in the oil hydraulic circuit, the timing and the phase place that replace traditional cam, length current"on"time of control electromagnetic valve are the fuel delivery that the pulsewidth of control signal is controlled oil sprayer.
Fig. 1 is the structural representation of the control gear of oil supply system in the specific embodiment of the invention.As shown in Figure 1, a kind of control gear that is used for the hydraulic free-piston engine oil supply system, comprise the piston position testing module 12 that connects successively, SC sigmal control module 13 and driver module 14, wherein piston position testing module 12 further comprises displacement transducer 121, signal processing circuit 122 and the A/D converter 123 that connects successively, the other end of displacement transducer 121 is connected with the piston of hydraulic free-piston engine 11, and the other end of driver module 14 is connected with the solenoid valve of hydraulic free-piston engine 15.
The piston position testing module all is connected with the SC sigmal control module respectively with driver module, and the solenoid valve of hydraulic free-piston engine links to each other with driver module by two leads.The piston position testing module detects the piston position of free-piston engine, the position signal that SC sigmal control resume module piston position testing module sends, when if piston position signal is the position of corresponding oil sprayer commencement of fuel injection, then the SC sigmal control module is sent the control signal that solenoid valve is opened to driver module, driver module is according to the control signal that receives, output control electric current is opened solenoid valve, and then the driving Injection Pump sprays a certain amount of fuel oil; If piston position signal enters the lower dead center scope of piston, then compare with the piston lower dead center value of presetting, if piston position is different with this predefined value, then in next work cycle of hydraulic free-piston engine, the SC sigmal control module changes the pulsewidth of the control signal of exporting to drive circuit, promptly change the current"on"time of solenoid valve, thereby change fuel injection quantity, closed-loop adjustment is carried out in the position of piston lower dead center.
In the piston position testing module, the displacement transducer that is connected successively, signal processing circuit and A/D converter, described signal processing circuit is carried out voltage follow to the output signal of displacement transducer, impedence matching, by A/D converter this voltage signal is converted to digital signal, and gives described SC sigmal control module.
Wherein, the displacement transducer in the displacement detecting module is a LVDT formula displacement transducer, and the connecting rod of displacement transducer is connected with pistons end by screw thread, and moves with piston, and displacement transducer exports the piston displacement signal to signal processing circuit by lead.
Fig. 2 is the flow chart of the controlling method of oil supply system in the specific embodiment of the invention.The detailed process of this controlling method is as follows:
The piston B.D.C position of hydraulic free-piston engine is not fixed, but a scope, default piston lower dead center value is the mid point of this scope, specifically depends on the Design of Mechanical Structure of hydraulic free-piston engine.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with the people of this technology in the disclosed technical scope of the present invention; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (8)
1, a kind of control gear of oil supply system, be applicable to hydraulic free-piston engine, it is characterized in that, comprise the piston position testing module, SC sigmal control module and driver module, described piston position testing module is connected with described SC sigmal control module with the piston of described hydraulic free-piston engine respectively, be used to detect described piston position, and described position of piston signal sent to described SC sigmal control module, described SC sigmal control module is connected with described driver module, be used to handle described position of piston signal, and control signal corresponding sent to described driver module, described driver module is connected with the solenoid valve of described hydraulic free-piston engine, is used to export the switch that the control electric current is finished described solenoid valve.
2, the control gear of a kind of oil supply system according to claim 1, it is characterized in that, described piston position testing module further comprises displacement transducer, signal processing circuit and A/D converter, described displacement transducer, signal processing circuit is connected successively with A/D converter, described displacement transducer is connected with described piston, be used to obtain the displacement signal of described piston, and described displacement signal sent to described signal processing circuit, described signal processing circuit is used for described displacement signal is carried out voltage follow, impedence matching, and voltage signal sent to described A/D converter, described A/D converter is connected with described SC sigmal control module, be used for converting described voltage signal to digital signal, and send to described SC sigmal control module.
3, the control gear of a kind of oil supply system according to claim 2, it is characterized in that, described displacement transducer is a LVDT formula displacement transducer, and the connecting rod of described LVDT formula displacement transducer is connected with the end of described piston by screw thread, and moves with described piston.
4, a kind of controlling method of oil supply system is applicable to hydraulic free-piston engine, it is characterized in that, may further comprise the steps:
A, piston position testing module detect the piston position of described hydraulic free-piston engine, and described position of piston signal is sent to described SC sigmal control module;
B, described SC sigmal control module are judged described position of piston signal, when described position signal corresponds to described hydraulic free-piston engine Injection Pump commencement of fuel injection, then export the control signal of default duration and give driver module;
C, described driver module are according to the control signal that receives, and output control electric current is opened solenoid valve, drives described Injection Pump oil spout;
D, described control signal are turn-offed, described closed electromagnetic valve, and described Injection Pump stops oil spout;
E, repeating step A are to step D, and in step B, described SC sigmal control module compares the lower dead center value and the predefined lower dead center value of described position of piston signal, and according to comparative result, adjusts the default duration of described control signal.
5, the controlling method of a kind of oil supply system according to claim 4 is characterized in that, steps A further may further comprise the steps:
Displacement transducer detects the piston position of described hydraulic free-piston engine, obtains the displacement signal of described piston, and sends to signal processing circuit;
Described signal processing circuit is carried out voltage follow, impedence matching to described displacement signal, and voltage signal is sent to A/D converter;
Described A/D converter is converted to digital signal to described voltage signal, and sends to described SC sigmal control module.
6, the controlling method of a kind of oil supply system according to claim 4, it is characterized in that, in the step e, when the lower dead center value of described position of piston signal greater than predefined lower dead center value, described SC sigmal control module shortens the default duration of control signal described in the step B.
7, the controlling method of a kind of oil supply system according to claim 4, it is characterized in that, in the step e, when the lower dead center value of described position of piston signal less than predefined lower dead center value, described SC sigmal control module prolongs the default duration of control signal described in the step B.
8, the controlling method of a kind of oil supply system according to claim 4 is characterized in that, described predefined lower dead center value is the mid point of described piston lower dead center scope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101047279A CN101260840B (en) | 2008-04-23 | 2008-04-23 | Fuel-feed system control device and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101047279A CN101260840B (en) | 2008-04-23 | 2008-04-23 | Fuel-feed system control device and method |
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| CN101260840A true CN101260840A (en) | 2008-09-10 |
| CN101260840B CN101260840B (en) | 2010-10-20 |
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| CN2008101047279A Expired - Fee Related CN101260840B (en) | 2008-04-23 | 2008-04-23 | Fuel-feed system control device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109952422A (en) * | 2016-10-13 | 2019-06-28 | 世倍特集团有限责任公司 | For checking method, control equipment, high-pressure injection system and the motor vehicle of the pressure sensor of high-pressure injection system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014172382A1 (en) * | 2013-04-16 | 2014-10-23 | Regents Of The University Of Minnesota | Systems and methods for transient control of a free-piston engine |
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2008
- 2008-04-23 CN CN2008101047279A patent/CN101260840B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109952422A (en) * | 2016-10-13 | 2019-06-28 | 世倍特集团有限责任公司 | For checking method, control equipment, high-pressure injection system and the motor vehicle of the pressure sensor of high-pressure injection system |
| CN109952422B (en) * | 2016-10-13 | 2022-01-28 | 世倍特集团有限责任公司 | Method for checking a pressure sensor of a high-pressure injection system, control device, high-pressure injection system and motor vehicle |
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| Publication number | Publication date |
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| CN101260840B (en) | 2010-10-20 |
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