CN101984247B - Pressurizing common-rail oil injection system - Google Patents
Pressurizing common-rail oil injection system Download PDFInfo
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- CN101984247B CN101984247B CN 201010531759 CN201010531759A CN101984247B CN 101984247 B CN101984247 B CN 101984247B CN 201010531759 CN201010531759 CN 201010531759 CN 201010531759 A CN201010531759 A CN 201010531759A CN 101984247 B CN101984247 B CN 101984247B
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Abstract
The invention provides a pressurizing common-rail oil injection system, relating to an oil injection system of a diesel. The invention provides the pressurizing common-rail oil injection system with a pressurizing valve and a common-rail pipe arranged together. The system comprises a high-pressure oil supply pump, the common-rail pipe, a high-pressure oil pipe and an oil return pipe, and is characterized by further comprising a control valve, the pressurizing valve, an electric control unit and a plurality of electric control injectors, wherein the pressurizing valve is arranged behind the common-rail pipe and each control valve, and the pressurizing valve, the common-rail pipe and the control valves are connected by the high-pressure oil pipe one another. In the system, lower injection pressure is adopted in pre-injection and after-injection, the exhaust and energy consumption are reduced, stroke of a pressurizing plunger can be controlled, and unnecessary oil return loss can be reduced.
Description
Technical field
The present invention relates to diesel engine fuel injection system.
Background technique
In the existing common rail for diesel engine injection system, adopting pressure charging valve (being called " pressure amplifier " again) further to improve the jet pressure of system, is a kind ofly effectively to improve one's methods.Chinese patent CN1158460C(WO0129409) a kind of technological scheme that pressure amplifier and oil sprayer are integrated is disclosed.This pressure amplifier is handled by control valve by executive component, primary pressure 300 ~ 1000bar can be amplified to 1600bar.Used control valve is a two position two-way valve and one second valve.The shortcoming of above-mentioned patent is that because pressure amplifier is arranged in the oil sprayer, the ratio of the external diameter of supercharging plunger and sectional area all is subjected to the restriction of oil sprayer diameter in the amplifier, is difficult to satisfy the requirement of pressure maximum being brought up to 2000bar.German patent DE 10059124(US2002/0092502A1) a kind of pressure charging valve connects accumulator through a two position two-way valve technological scheme is disclosed, wherein pressure charging valve and oil sprayer are not together, so the area of the external diameter of charged piston and charged piston and supercharging plunger is than the restriction that is not subjected to the oil sprayer diameter.
In addition, in the common rail for diesel engine injection system, adopt ECU (Electrical Control Unit) control electric-controlled fuel injector to realize that the method for multi-injection belongs to prior art.In order further to improve the emission standard of diesel engine, adopt lower jet pressure when when adopting the multi-injection technology, wishing to be implemented in pre-spray and back spray, and when main injection, adopt high injection pressure.In addition, because in the ignition delay period of diesel engine before the firing chamber takes fire, especially can not be too high at the incipient stage of ignition delay period injection rate, otherwise the noise and the NOx discharging that can strengthen diesel engine.But above-mentioned two described injection systems of patent adopt the requirement of low jet pressure, also the injection rate of restive ignition delay period in the time of all can't being implemented in pre-spray and back spray.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides the pressure boosting common rail injection system that a kind of pressure charging valve and common rail pipe are installed together.
The present invention includes high-pressure fuel-feed pump, common rail pipe, high-pressure oil pipe, return tube, it is characterized in that: also comprise control valve, pressure charging valve, ECU (Electrical Control Unit) and a plurality of electric-controlled fuel injector, pressure charging valve wherein is installed in common rail pipe and each control valve back, connect with high-pressure oil pipe mutually
A. described control valve is a two-position four-way high speed electromagnetic selector valve, it is supplied with the fuel oil of common rail pressure Pc by common rail pipe, and can be apace be transformed into cavity of resorption fuel feeding, the commutation action of this control valve and controlling by above-mentioned ECU (Electrical Control Unit) turn around time to pressure charging valve from epicoele fuel feeding to pressure charging valve;
B. above-mentioned pressure boosting common rail injection system can be realized multi-injection, under the control of above-mentioned ECU (Electrical Control Unit), electric-controlled fuel injector is wherein supplied with the fuel oil of boost pressure P3 by above-mentioned pressure charging valve when main injection, when pre-spray and back injection, electric-controlled fuel injector is directly supplied with the fuel oil of common rail pressure Pc by above-mentioned common rail pipe.
The charged piston and the supercharging plunger that fuse are housed in the pressure charging valve of the present invention, and charged piston and supercharging plunger are the coaxial clyinders that can pump; In pressure charging valve, the space of charged piston top is an epicoele, and the space of charged piston below is a cavity of resorption, and the space of supercharging plunger below is a booster cavity; The ratio of the sectional area of charged piston and supercharging plunger is 1:2.5 ~ 1:3.0.
An automatically controlled throttle valve is equipped with in the present invention on the connecting pipeline of pressure charging valve cavity of resorption and control valve, it controls its throttling damping by ECU (Electrical Control Unit).
Pressure charging valve of the present invention and control valve integrate, and are installed on the described common rail pipe, perhaps are installed near the common rail pipe.
Boost pressure P3 of the present invention is 2000 ~ 2500bar, and wherein said common rail pressure Pc is 1000
Bar.
Electric-controlled fuel injector of the present invention is a kind of oil sprayer by controlling fuel injection by electric control unit timing and fuel injection quantity, and the final controlling element of this electric-controlled fuel injector is high-speed electromagnetic valve or piezo actuator.
Store the program that the control electric-controlled fuel injector realizes that pre-spray, main injection and back are sprayed in the ECU (Electrical Control Unit) of the present invention.
Store the program of regulating automatically controlled throttle valve damping size in the ECU (Electrical Control Unit) of the present invention.
Advantage of the present invention and beneficial effect are:
A. when pre-spray and back spray, adopt lower jet pressure, reduced discharging and energy loss, and can control the stroke of supercharging plunger, reduced unnecessary oil return loss.
B., an automatically controlled throttle valve is housed on the connecting pipeline of pressure charging valve cavity of resorption and control valve, can control the movement velocity of charged piston and supercharging plunger by ECU (Electrical Control Unit), thereby the variation of control boost pressure P3, the slope of curve of jet pressure ascent stage when just changing main injection, and then control injection rate and velocity of combustion by the damping of regulating automatically controlled throttle valve.So just can improve power character, Economy and the purification level of motor, reach the target that reduces noise and NOx discharging.
C. the present invention integrates pressure charging valve and control valve, is installed on the common rail pipe, or is contained near the common rail pipe.Make compact structure, therefore do not need to help the design arrangement of oil sprayer on cylinder head because of having added the boundary dimension that pressure charging valve strengthens oil sprayer.
Description of drawings
Fig. 1 is pressure boosting common rail injection system figure of the present invention;
The flow schematic diagram of fuel oil in injection system when Fig. 2 is pre-spray of the present invention and back spray;
Fig. 3 is a control system block diagram of the present invention;
Fig. 4 is the multi-injection schematic representation that the present invention implements.
Among the figure: 1, fuel tank, 2, oil transfer pump, 3, high-pressure fuel-feed pump, 5, common rail pipe, 6, control valve, 7, pressure charging valve, 8, charged piston, 9, supercharging plunger, 10, epicoele, 11, cavity of resorption, 12, booster cavity, 14, high-pressure oil pipe, 15, return tube, 16, electric-controlled fuel injector, 17, automatically controlled throttle valve, 18, connecting pipeline, 19, one-way valve, 20, ECU (Electrical Control Unit), 21, the oil return import.
The P1 upper cavity pressure, cavity pressure under the P2, P3 boost pressure, Pc common rail pressure.
Embodiment
The present invention includes high-pressure fuel-feed pump 3, common rail pipe 5, high-pressure oil pipe 14, return tube 15, it is characterized in that: also comprise control valve 6, pressure charging valve 7, ECU (Electrical Control Unit) 20 and a plurality of electric-controlled fuel injector 16, pressure charging valve 7 wherein is installed in common rail pipe 5 and each control valve 6 back, connect with high-pressure oil pipe 14 mutually
A. described control valve 6 is two-position four-way high speed electromagnetic selector valves, it is supplied with the fuel oil of common rail pressure Pc by common rail pipe 5, and can be apace being transformed into cavity of resorption 11 fuel feeding to pressure charging valve 7 from epicoele 10 fuel feeding to pressure charging valve 7, the commutation action of this control valve 6 and turn around time are controlled by above-mentioned ECU (Electrical Control Unit) 20;
B. above-mentioned pressure boosting common rail injection system can be realized multi-injection, under the control of above-mentioned ECU (Electrical Control Unit) 20, electric-controlled fuel injector 16 is wherein supplied with the fuel oil of boost pressure P3 by above-mentioned pressure charging valve 7 when main injection, when pre-spray and back injection, electric-controlled fuel injector 16 is directly supplied with the fuel oil of common rail pressure Pc by above-mentioned common rail pipe 5.
The charged piston 8 and the supercharging plunger 9 that fuse are housed in the pressure charging valve 7 of the present invention, and charged piston 8 and supercharging plunger 9 are the coaxial clyinders that can pump; In pressure charging valve 7, the space of charged piston 8 tops is epicoeles 10, and the space of charged piston 8 belows is cavity of resorptions 11, and the space of supercharging plunger 9 belows is booster cavities 12; The ratio of the sectional area of charged piston 8 and supercharging plunger 9 is 1:2.5 ~ 1:3.0.
An automatically controlled throttle valve 17 is equipped with in the present invention on the connecting pipeline 18 of pressure charging valve cavity of resorption 11 and control valve 6, it is by ECU (Electrical Control Unit) 20 its throttling dampings of control.
Boost pressure P3 of the present invention is 2000 ~ 2500bar, and wherein said common rail pressure Pc is 1000
Bar.
Electric-controlled fuel injector 16 of the present invention is a kind of oil sprayers by ECU (Electrical Control Unit) 20 control injection timings and fuel injection quantity, and the final controlling element of this electric-controlled fuel injector is high-speed electromagnetic valve or piezo actuator.
Store the program that the control electric-controlled fuel injector realizes that pre-spray, main injection and back are sprayed in the ECU (Electrical Control Unit) 20 of the present invention.
Store the program of regulating automatically controlled throttle valve 17 damping sizes in the ECU (Electrical Control Unit) 20 of the present invention.
Describe the embodiment of diesel engine supercharging co-rail oil injection system of the present invention in detail below in conjunction with accompanying drawing.
Fig. 1 is the system schematic of a kind of preferred embodiment of pressure boosting common rail injection system of the present invention.For graphic simplicity, among Fig. 1 only to the high-pressure oil passage that the leads to an electric-controlled fuel injector 16 detailed diagram of contrasting.The high-pressure oil passage that leads to all the other each cylinders of multi-cylinder diesel engine by common rail pipe 5 all similarly.The figure intermediate fuel oil enters common rail pipe 5 from fuel tank 1 behind oil transfer pump 2 and high-pressure fuel-feed pump 3 raising pressure.Fuel oil keeps stable common rail pressure Pc in common rail pipe 5.In the main injection stage, fuel oil enters control valve 6 by common rail pipe 5 through high-pressure oil passage.Control valve 6 is two-position four-way high speed electromagnetic selector valves that are subjected to ECU (Electrical Control Unit) 20 controls, at this moment this valve is in position left, fuel oil enters the epicoele 10 of pressure charging valve 7 through outlet L, fuel oil promotes charged piston 8 with common rail pressure Pc and supercharging plunger 9 moves downward, and makes the oil pressure in the booster cavity 12 bring up to boost pressure P3.At this moment electric-controlled fuel injector 16 is that the main injection fuel oil of P3 sprays in the burning chamber of diesel engine with pressure.Above-mentioned electric-controlled fuel injector 16 adopts the used electric-controlled fuel injector of common rail for diesel engine injection system in the prior art, is a kind of oil sprayer by ECU (Electrical Control Unit) 20 control injection timings and fuel injection quantity, and the final controlling element of this electric-controlled fuel injector is high-speed electromagnetic valve or piezo actuator.Meanwhile, when control valve 6 was in left the position, oil return import 21 and the outlet that is connected return tube 15 were communicated with.The cavity of resorption 11 of pressure charging valve 7 is through connecting pipeline 18 and 17 oil returns of automatically controlled throttle valve.Because the present invention has adopted the automatically controlled throttle valve 17 by ECU (Electrical Control Unit) 20 controls, so supercharging plunger 9 stroke that moves downward and the speed that moves downward all can be controlled.
The flow schematic diagram of fuel oil in injection system when Fig. 2 is pre-spray and back spray.After main injection finished, control valve 6 moved to position R to the right shown in Figure 2 from position L left shown in Figure 1 under the manipulation of ECU (Electrical Control Unit) 20.At this moment opened the passage that pressure oil in the common rail pipe 5 enters the cavity of resorption 11 of pressure charging valve 7, pressure is that the fuel oil of Pc promotes charged piston 8 and supercharging plunger 9 moves upward.At this moment, because supercharging plunger 9 moves upward, the booster cavity internal pressure descends one-way valve 19 is opened.Meanwhile, the fuel oil in the epicoele 10 of pressure charging valve 7 flows out through control valve 6, and flows back to fuel tank 1 through return tube.At this moment the fuel pressure that enters oil sprayer is common rail pressure Pc (1000bar).In this stage, electric-controlled fuel injector 16 carries out back injection and pre-spray by the fuel injection quantity and the injection time of ECU (Electrical Control Unit) 20 regulations.The low-voltage fuel that leaks in the electric-controlled fuel injector 16 flows back to fuel tank 1 through return tube 15.The control valve 6 that comprises in the dashed rectangle among Fig. 1 and Fig. 2, pressure charging valve 7 and automatically controlled throttle valve 17 these three parts can integrate, and also any two parts wherein can be integrated.Be installed in after integrated on the common rail pipe 5, or be contained near the common rail pipe 5.
Automatically controlled throttle valve 17 among the above-mentioned pressure boosting common rail injection system embodiment also can be cancelled, thereby has simplified injection system.At this moment the damping of connecting pipeline 18 is fixed by project organization, can not regulate and control.Injection system after this simplification is as long as basic technical features according to the invention still belongs to protection scope of the present invention.
Fig. 3 is a control system block diagram of the present invention.Store the program that the control electric-controlled fuel injector realizes that pre-spray, main injection and back are sprayed in the wherein said ECU (Electrical Control Unit) 20.And in described ECU (Electrical Control Unit) 20, also store the program of regulating automatically controlled throttle valve (17) damping size.Control unit among Fig. 3 (ECU) 20 carries out data processing according to the signal by temperature transducer, pressure transducer, engine rotation speed sensor and throttle position switch input, and then presses the program of internal memory respectively to control valve 6, electric-controlled fuel injector 16, automatically controlled throttle valve 17 output control signals by control unit 20.Wherein control valve 6 also carries out hydraulic control to pressure charging valve 7 and electric-controlled fuel injector 16.Above-mentioned concrete controlling method and program belong to known prior art.
Fig. 4 is the motor multi-injection schematic representation that the present invention implements.Be y coordinate with the pressure P among the figure, unit is the bar(crust).With time is abscissa, and unit is the ms(millisecond), be abscissa perhaps with crank angle θ, the deg of unit (degree).Curve a represents pre-spray among the figure, and curve bcde represents main injection, and on behalf of the back, curve f spray.Jet pressure when pre-spray and back spray is common rail pressure Pc, and pressure is lower.Peak injection pressure during main injection is a boost pressure, and pressure is higher.Bc section in the main injection curve is the ascent stage of jet pressure, and the gradient of this section curve can be regulated by automatically controlled throttle valve 17, therefore can control the injection rate of ignition delay period.C ˊ is to regulate the different injection rate pattern curves that different throttle valve openings obtain with C 〞, can improve the emission performance under the Under Different Work Condition of Engine.
Claims (5)
1. pressure boosting common rail injection system, comprise high-pressure fuel-feed pump (3), common rail pipe (5), high-pressure oil pipe (14), return tube (15), it is characterized in that: also comprise control valve (6), pressure charging valve (7), ECU (Electrical Control Unit) (20) and a plurality of electric-controlled fuel injector (16), pressure charging valve wherein (7) is installed in common rail pipe (5) and each control valve (6) back, connect with high-pressure oil pipe (14) mutually
A. described control valve (6) is a two-position four-way high speed electromagnetic selector valve, it is supplied with the fuel oil of common rail pressure Pc by common rail pipe (5), and can be apace be transformed into cavity of resorption (11) fuel feeding, the commutation action of this control valve (6) and controlling by above-mentioned ECU (Electrical Control Unit) (20) turn around time to pressure charging valve (7) from epicoele (10) fuel feeding to pressure charging valve (7);
B. above-mentioned pressure boosting common rail injection system can be realized multi-injection, under the control of above-mentioned ECU (Electrical Control Unit) (20), electric-controlled fuel injector wherein (16) is supplied with the fuel oil of boost pressure P3 by above-mentioned pressure charging valve (7) when main injection, when pre-spray and back injection, electric-controlled fuel injector (16) is directly supplied with the fuel oil of common rail pressure Pc by above-mentioned common rail pipe (5);
The charged piston (8) and the supercharging plunger (9) that fuse are housed in the c. described pressure charging valve (7), and charged piston (8) and supercharging plunger (9) are the coaxial clyinders that can pump; The space of charged piston (8) top is epicoele (10) in pressure charging valve (7), and the space of charged piston (8) below is cavity of resorption (11), and the space of supercharging plunger (9) below is booster cavity (12); The ratio of the sectional area of charged piston (8) and supercharging plunger (9) is 1:2.5 ~ 1:3.0;
D. on the connecting pipeline (18) of pressure charging valve cavity of resorption (11) and control valve (6) an automatically controlled throttle valve (17) is housed, it controls its throttling damping by ECU (Electrical Control Unit) (20);
E. store the program of regulating automatically controlled throttle valve (17) damping size in the described ECU (Electrical Control Unit) (20).
2. pressure boosting common rail injection system according to claim 1 is characterized in that: wherein said pressure charging valve (7) and control valve (6) integrate, and are installed on the described common rail pipe (5), or are installed near the common rail pipe (5).
3. pressure boosting common rail injection system according to claim 1 is characterized in that: wherein said boost pressure P3 is 2000 ~ 2500bar, and wherein said common rail pressure Pc is 1000bar.
4. pressure boosting common rail injection system according to claim 1, it is characterized in that: wherein said electric-controlled fuel injector (16) is a kind of oil sprayer that ECU (Electrical Control Unit) (20) control injection timing and fuel injection quantity are arranged, and the final controlling element of this electric-controlled fuel injector is high-speed electromagnetic valve or piezo actuator.
5. pressure boosting common rail injection system according to claim 1 is characterized in that: store the program that the control electric-controlled fuel injector realizes that pre-spray, main injection and back are sprayed in the wherein said ECU (Electrical Control Unit) (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN 201010531759 CN101984247B (en) | 2010-11-04 | 2010-11-04 | Pressurizing common-rail oil injection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010531759 CN101984247B (en) | 2010-11-04 | 2010-11-04 | Pressurizing common-rail oil injection system |
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| CN101984247A CN101984247A (en) | 2011-03-09 |
| CN101984247B true CN101984247B (en) | 2013-07-31 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9638128B2 (en) * | 2011-04-29 | 2017-05-02 | International Engine Intellectual Property Company, Llc. | Strategy for fueling a diesel engine |
| CN102691604B (en) * | 2012-05-24 | 2014-01-29 | 哈尔滨工程大学 | Multi-stage boosting electric-control common-rail oil injection system |
| CN103306839B (en) * | 2013-07-01 | 2015-09-09 | 潍柴动力股份有限公司 | The controlling method of rail pressure of common rail and control system |
| CN105484918B (en) * | 2015-12-06 | 2017-11-03 | 北京工业大学 | A kind of method for controlling oil return of monoblock pump fuel system |
| CN106089466B (en) * | 2016-08-24 | 2019-03-15 | 湖南奔腾动力科技有限公司 | A method of realizing fuel injector injection control strategy |
| CN109630332B (en) * | 2018-12-14 | 2020-06-19 | 重庆军通汽车有限责任公司 | Fuming vehicle suitable for operation in different altitude environments |
| CN109707546A (en) * | 2018-12-29 | 2019-05-03 | 重庆红江机械有限责任公司 | A kind of oil control valve out of electric-controlled fuel injector |
| CN112761838A (en) * | 2021-01-25 | 2021-05-07 | 哈尔滨工程大学 | Modular diesel engine double-valve common rail system with flexibly adjustable oil injection rule |
| CN113202744B (en) * | 2021-04-07 | 2022-12-02 | 中国石油化工集团有限公司 | Oil injection system for corrosion prevention of reciprocating compressor cylinder under acidic medium |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5669334A (en) * | 1994-02-11 | 1997-09-23 | Mtu Motoren-Und Turbinen-Union Friedrichshafen Gmbh | Injection valves for liquid-fuel mixtures and associated processes |
| US6644278B2 (en) * | 2000-11-29 | 2003-11-11 | Robert Bosch Gmbh | Pressure controlled injector for injection systems with high pressure collecting area |
| CN101213363A (en) * | 2005-06-29 | 2008-07-02 | 罗伯特·博世有限公司 | Injector with a pressure intensifier that can be switched on |
| CN101506513A (en) * | 2006-08-18 | 2009-08-12 | 罗伯特·博世有限公司 | Fuel injector with piston restoring of a pressure intensifier piston |
| CN201858067U (en) * | 2010-11-04 | 2011-06-08 | 中国第一汽车集团公司 | Supercharging common rail fuel injection system |
-
2010
- 2010-11-04 CN CN 201010531759 patent/CN101984247B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5669334A (en) * | 1994-02-11 | 1997-09-23 | Mtu Motoren-Und Turbinen-Union Friedrichshafen Gmbh | Injection valves for liquid-fuel mixtures and associated processes |
| US6644278B2 (en) * | 2000-11-29 | 2003-11-11 | Robert Bosch Gmbh | Pressure controlled injector for injection systems with high pressure collecting area |
| CN101213363A (en) * | 2005-06-29 | 2008-07-02 | 罗伯特·博世有限公司 | Injector with a pressure intensifier that can be switched on |
| CN101506513A (en) * | 2006-08-18 | 2009-08-12 | 罗伯特·博世有限公司 | Fuel injector with piston restoring of a pressure intensifier piston |
| CN201858067U (en) * | 2010-11-04 | 2011-06-08 | 中国第一汽车集团公司 | Supercharging common rail fuel injection system |
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