CN105134438A - Controllable needle valve lift electronic fuel injector - Google Patents
Controllable needle valve lift electronic fuel injector Download PDFInfo
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- CN105134438A CN105134438A CN201510478897.3A CN201510478897A CN105134438A CN 105134438 A CN105134438 A CN 105134438A CN 201510478897 A CN201510478897 A CN 201510478897A CN 105134438 A CN105134438 A CN 105134438A
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- oil
- control cavity
- control chamber
- needle valve
- spray nozzle
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Abstract
The invention provides a controllable needle valve lift electronic fuel injector which comprises a fuel injector high-pressure oil path, a control cavity, a control cavity oil inlet channel, a control cavity oil outlet channel, a fuel spray nozzle and a fuel spray nozzle needle valve, wherein the control cavity oil inlet channel and the control cavity oil outlet channel are communicated with the control cavity. The fuel injector high-pressure oil path is communicated with the control cavity oil inlet channel and the fuel spray nozzle at the same time. The fuel spray nozzle needle valve is connected with the control cavity and the fuel spray nozzle. The control cavity oil outlet channel is communicated with a fuel injector low-pressure oil path. A variable stroke executor achieving the stop function on the stroke of the fuel spray nozzle needle valve is added in the control cavity. The variable stroke executor is added in the control cavity, the fuel spray nozzle needle valve which is started and moves is stopped under different engine work conditions, active control over the motion rule of the fuel spray nozzle needle valve is achieved, and fuel injection stability and consistency are improved. The machining size and precision of the fuel spray nozzle needle valve, the control cavity, a control cavity oil inlet metering hole, a control cavity oil outlet metering hole and other parts related to the work of the needle valve can be improved, and therefore manufacturing cost is reduced.
Description
Technical field
The invention belongs to electric-controlled fuel injector technical field, especially relate to a kind of controlled needle lift electric-controlled fuel injector.
Background technique
Electric-controlled fuel injector is one of parts of most critical in common rail system, is also design, the maximum parts of technology difficulty.Fuel oil in high pressure oil rail, by the opening and closing of Controlling solenoid valve, is sprayed into firing chamber with the injection timing of the best, fuel injection quantity and fuel injection rate by ECU.
In prior art, general electric-controlled fuel injector adopts 2/2-way, two-bit triplet electromagnetic valve injection process.As shown in Figure 1, this structure characteristic is: all controlled cavity pressure of the opening movement of injector valve and closing movement and oil nozzle pressure match affect.High-speed electromagnetic valve is energized, and control chamber pressure starts to reduce, and oil nozzle internal pressure is substantially constant, after control chamber pressure drop to injection pressure of injector, and injector valve opening movement, oil sprayer commencement of fuel injection; High-speed electromagnetic valve power-off, control chamber pressure starts to recover, and oil nozzle internal pressure also has certain change, and after control chamber pressure recover to oil sprayer closing pressure, injector valve moves downward, and oil sprayer starts oil-break.
In single oil sprayer multi cycle injection process, by the impact of various factors, the pressure in control chamber and oil nozzle is uncontrolled, cause the injector valve characteristics of motion uncontrolled, finally cause single oil sprayer multi cycle oil spout unstable properties, oil injection duration is poor, and fuel injection quantity is poor; In addition, in oil sprayer manufacture process, machining error is inevitable, the control chamber between the oil sprayer individuality brought by machining error and oil nozzle internal pressure difference, and causes identity of injection between many oil sprayers poor.
Existing improved though is: for improving the identity of injection between single oil sprayer multi cycle oil spout stability and multiple oil sprayer, need to take that a large amount of Optimized Matching work is carried out to oil sprayer and oil supply system, by improving the methods such as the machining accuracy of oil sprayer each component, this will improve research and development time cost, greatly through costly.Therefore, the performance for stability of electric-controlled fuel injector, consistency performance and manufacture cost need consider.
Summary of the invention
In view of this, the present invention is intended to propose a kind of controlled needle lift electric-controlled fuel injector, ACTIVE CONTROL can be carried out to injector valve motion, improve the conformity of injector valve shutoff stroke, thus reach the effect improving identity of injection and reduction manufacture cost between single oil sprayer multi cycle oil spout stability, many oil sprayers.
Mentality of designing of the present invention is: in single oil sprayer multi cycle injection process, pressure in control chamber and oil nozzle is uncontrolled, cause the injector valve characteristics of motion uncontrolled, the maximum lift causing injector valve to rise to is uncontrolled, because injector valve shutoff stroke is inconsistent, finally cause single oil sprayer multi cycle oil spout unstable properties; So improved though controls injector valve shutoff stroke.
For achieving the above object, technological scheme of the present invention is achieved in that
A kind of controlled needle lift electric-controlled fuel injector, comprise oil sprayer high-pressure oil passage, control chamber and the control chamber oil input channel be communicated with it and control chamber oil road, oil nozzle, injector valve, described oil sprayer high-pressure oil passage is communicated with control chamber oil input channel and oil nozzle simultaneously, described injector valve connection control chamber and oil nozzle, described control chamber oil road is communicated with oil sprayer low pressure oil way; The route-variable final controlling element stroke of injector valve being played to interception is added in described control chamber.
Further, described route-variable final controlling element is any one in piezoelectricity stack, piezoelectricity plate-like or piezoelectricity sheet.
Further, the stroke excursion of described route-variable final controlling element is at 0 ~ 0.2mm.
Relative to prior art, the present invention has following advantage:
(1) by increasing route-variable actuator apparatus in control chamber, utilize the feature of this device journey variable, realize under working conditions of different engines, barrier effect is risen to the injector valve of opening movement, achieve the ACTIVE CONTROL to the injector valve characteristics of motion, and the impact of pressure match in no longer controlled chamber and oil nozzle, improve oil spout stability and conformity.
(2) after described self machining accuracy of route-variable final controlling element, control accuracy improve, processing dimension and the precision of other part relevant with needle-valve work such as injector valve, control chamber, control chamber oil-feed metering-orifice, the fuel-displaced metering-orifice of control chamber can be reduced, thus reduce manufacture cost.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of prior art electric-controlled fuel injector;
Fig. 2 is the structural representation of the controlled needle lift electric-controlled fuel injector described in the embodiment of the present invention.
Description of reference numerals:
1-oil sprayer high-pressure oil passage, 2-control chamber oil input channel, 3-control chamber oil-feed metering-orifice, 4-control chamber, 5-control chamber oil road, the fuel-displaced metering-orifice of 6-control chamber, 7-control chamber oil road control valve, 8-high-speed electromagnetic valve, 9-oil sprayer low pressure oil duct, 10-oil nozzle, 11-injector valve, 12-route-variable final controlling element.
Embodiment
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.
Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
A kind of controlled needle lift electric-controlled fuel injector, as shown in Figure 2, comprises oil sprayer high-pressure oil passage 1, control chamber 4, control chamber oil input channel 2, control chamber oil road 5 and oil nozzle 10; Described oil sprayer high-pressure oil passage 1 is communicated with control chamber oil input channel 2 and oil nozzle 10 simultaneously, described control chamber oil input channel 2 is communicated with control chamber 4, described control chamber 4 is connected by injector valve 11 with oil nozzle 10, is provided with control chamber oil-feed metering-orifice 3 in described control chamber oil input channel 2;
Described control chamber oil road 5 is communicated with oil sprayer low pressure oil duct 9 by control chamber oil road control valve 7, is provided with the fuel-displaced metering-orifice 6 of control chamber in described control chamber oil road 5; Described control chamber oil road control valve 7 connects high-speed electromagnetic valve 8, is controlled the keying of control chamber oil road control valve 7 by high-speed electromagnetic valve;
In described control chamber 4, add the route-variable final controlling element 12 stroke of injector valve 11 being played to interception, route-variable final controlling element 12 is Direct driver injector valve 11 not, and original state does not contact with injector valve 11; Different according to engine operating condition, the stroke adjustable of route-variable final controlling element 12, carries out ACTIVE CONTROL to injector valve 11 opening movement under realizing different operating mode, and the impact that no longer controlled chamber 4 is mated with oil nozzle 10 internal pressure.
Under motor full working scope, the opening movement of injector valve 11 all can stop by route-variable final controlling element 12; Along with the increase of engine operating condition, the stroke of route-variable final controlling element 12 reduces.
After the machining accuracy of route-variable final controlling element 12 of the present invention, Stroke Control precision improve, the machining accuracies to the influential part of internal pressure of control chamber 4, oil nozzle 10 such as oil nozzle 10, control chamber 4, control chamber oil input channel 2, control chamber oil road 5, control chamber oil-feed metering-orifice 3, the fuel-displaced metering-orifice 6 of control chamber can be reduced.
Route-variable final controlling element 12 of the present invention can adopt in piezoelectricity stack, piezoelectricity plate-like or piezoelectricity sheet any one.The stroke excursion of described route-variable final controlling element 12 is at 0 ~ 0.2mm, and effect is best.
Controlled needle lift electric-controlled fuel injector of the present invention using method, comprise:
Before oil spout, high-speed electromagnetic valve 8 is energized, open control chamber oil road control valve 7, in control chamber 4, fuel oil flows to oil sprayer low pressure oil way 9 through the fuel-displaced metering-orifice 6 of control chamber, control chamber oil road control valve 7, the pressure of control chamber 4 starts to reduce, and the fuel oil simultaneously in oil sprayer high-pressure oil passage 1 is through control chamber oil input channel 2, control chamber oil-feed metering-orifice 3 ramp metering chamber 4.
At the oil spout initial stage, oil nozzle 10 internal pressure is constant, and when the pressure of control chamber 4 is reduced to injection pressure of injector, injector valve 11 overcomes closedown hydraulic coupling, oil nozzle 10 commencement of fuel injection;
The oil spout middle and later periods, different according to engine operating condition, the stroke of adjustment route-variable final controlling element 12, makes it to injector valve 11 barrier effects of opening movement.
Oil spout latter stage, high-speed electromagnetic valve 8 power-off, control chamber oil road control valve 7 is closed, and control chamber 4 internal pressure starts to recover, and injector valve 11 starts to do closing movement, terminates oil spout.
The working procedure of the controlled needle lift electric-controlled fuel injector of the present invention is:
In the control chamber 4 that high pressure fuel enters oil sprayer through oil sprayer high-pressure oil passage 1 and oil nozzle 10; After high-speed electromagnetic valve 8 is energized, control chamber oil road control valve 7 is opened, and the pressure of control chamber 4 starts to reduce; After injector valve 11 starts opening movement, oil nozzle 10 commencement of fuel injection, the internal pressure of oil nozzle 10 starts change; After fuel injection beginning, the pressure of control chamber 4 and the internal pressure of oil nozzle 10 will affect the characteristics of motion of injector valve 11, and the characteristics of motion of injector valve 11 can impact the internal pressure of control chamber 4 and oil nozzle 10 again after changing simultaneously; By changing the stroke of route-variable final controlling element 12, under different operating mode, can come in contact with route-variable final controlling element 12 after making injector valve 11 opening movement, make opening movement later stage of injector valve 11 and closing movement original state consistent, reach the effect improving single oil sprayer oil spout stability.Improve machining accuracy, the control accuracy of variable final controlling element 12, the conformity of each oil injector oil nozzle needle-valve 11 closed condition in multi-cylinder system can be improved, reach the effect improving each oil sprayer identity of injection of multi-cylinder system.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. a controlled needle lift electric-controlled fuel injector, comprise oil sprayer high-pressure oil passage (1), control chamber (4) and the control chamber oil input channel (2) be communicated with it and control chamber oil road (5), oil nozzle (10), injector valve (11), described oil sprayer high-pressure oil passage (1) is communicated with control chamber oil input channel (2) and oil nozzle (10) simultaneously, described injector valve (11) connection control chamber (4) and oil nozzle (10), described control chamber oil road (5) is communicated with oil sprayer low pressure oil way (9); It is characterized in that: in described control chamber (4), add the route-variable final controlling element (12) stroke of injector valve (11) being played to interception.
2. controlled needle lift electric-controlled fuel injector according to claim 1, is characterized in that: described route-variable final controlling element (12) is piezoelectricity stack, any one in piezoelectricity plate-like or piezoelectricity sheet.
3. controlled needle lift electric-controlled fuel injector according to claim 1, is characterized in that: the stroke excursion of described route-variable final controlling element (12) is at 0 ~ 0.2mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510478897.3A CN105134438A (en) | 2015-08-06 | 2015-08-06 | Controllable needle valve lift electronic fuel injector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510478897.3A CN105134438A (en) | 2015-08-06 | 2015-08-06 | Controllable needle valve lift electronic fuel injector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105134438A true CN105134438A (en) | 2015-12-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510478897.3A Pending CN105134438A (en) | 2015-08-06 | 2015-08-06 | Controllable needle valve lift electronic fuel injector |
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| CN (1) | CN105134438A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105370468A (en) * | 2015-12-11 | 2016-03-02 | 中国北方发动机研究所(天津) | Pressure control valve for oil sprayer |
| CN114165373A (en) * | 2021-12-17 | 2022-03-11 | 中国船舶重工集团公司第七一一研究所 | Fuel injector and common rail system |
Citations (6)
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| US4637553A (en) * | 1984-10-09 | 1987-01-20 | Diesel Kiki Co., Ltd. | Fuel injection nozzle unit for internal combustion engines |
| CN1594867A (en) * | 2004-07-15 | 2005-03-16 | 于魁江 | Electric control oil atomizer |
| CN101251067A (en) * | 2008-03-21 | 2008-08-27 | 北京理工大学 | Tappet rod type high pressure co-rail electric-controlled oil ejector |
| CN101963119A (en) * | 2010-11-08 | 2011-02-02 | 郑国璋 | Piezoelectric high-pressure common rail electronic control injector |
| CN103925136A (en) * | 2014-04-12 | 2014-07-16 | 哈尔滨工程大学 | Fuel injector with solenoid valve mounted on side |
| CN103925135A (en) * | 2014-04-12 | 2014-07-16 | 哈尔滨工程大学 | Common rail oil injector |
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2015
- 2015-08-06 CN CN201510478897.3A patent/CN105134438A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4637553A (en) * | 1984-10-09 | 1987-01-20 | Diesel Kiki Co., Ltd. | Fuel injection nozzle unit for internal combustion engines |
| CN1594867A (en) * | 2004-07-15 | 2005-03-16 | 于魁江 | Electric control oil atomizer |
| CN101251067A (en) * | 2008-03-21 | 2008-08-27 | 北京理工大学 | Tappet rod type high pressure co-rail electric-controlled oil ejector |
| CN101963119A (en) * | 2010-11-08 | 2011-02-02 | 郑国璋 | Piezoelectric high-pressure common rail electronic control injector |
| CN103925136A (en) * | 2014-04-12 | 2014-07-16 | 哈尔滨工程大学 | Fuel injector with solenoid valve mounted on side |
| CN103925135A (en) * | 2014-04-12 | 2014-07-16 | 哈尔滨工程大学 | Common rail oil injector |
Non-Patent Citations (1)
| Title |
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| 杨腾飞等: "直接驱动式共轨系统可控针阀升程的驱动电路研究", 《机电工程》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105370468A (en) * | 2015-12-11 | 2016-03-02 | 中国北方发动机研究所(天津) | Pressure control valve for oil sprayer |
| CN105370468B (en) * | 2015-12-11 | 2017-09-29 | 中国北方发动机研究所(天津) | Fuel injector pressure-control valve |
| CN114165373A (en) * | 2021-12-17 | 2022-03-11 | 中国船舶重工集团公司第七一一研究所 | Fuel injector and common rail system |
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Application publication date: 20151209 |