CN105386914A - Double-rail high-pressure common-rail system - Google Patents
Double-rail high-pressure common-rail system Download PDFInfo
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- CN105386914A CN105386914A CN201510931293.XA CN201510931293A CN105386914A CN 105386914 A CN105386914 A CN 105386914A CN 201510931293 A CN201510931293 A CN 201510931293A CN 105386914 A CN105386914 A CN 105386914A
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- pressure
- rail
- fuel
- oil
- solenoid valve
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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
- F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
- F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
- F02M55/025—Common rails
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention provides a double-rail high-pressure common-rail system. The system comprises a high-pressure oil supplying pump, an electric control unit, a first fuel oil rail, a first solenoid valve, common-rail oil injectors, a second fuel oil rail and an electric control pressure regulating valve, wherein the first solenoid valve is arranged between the first fuel oil rail and the second fuel oil rail; the high-pressure oil supplying pump is connected to the first fuel oil rail; the common-rail oil injectors are connected to the second fuel oil rail; a solenoid valve of the common-rail oil injectors, a flow metering valve of the high-pressure oil supplying pump, the first solenoid valve and the electric control pressure regulating valve are connected to the electric control unit. The system has the following advantages: the two fuel oil rails are arranged to stabilize the fuel oil storing pressure and the fluctuation of supplied oil, as well as stabilizing the fuel oil injection and the fluctuation of injected oil, and thus the influence of the oil supplying process of the high-pressure oil supplying pump on the oil injecting process can be reduced; the opening time and duration of the first solenoid valve are controlled, so that the oil supplying quantity, the oil supplying time and the oil supplying rule of the second fuel oil rail can be actively controlled.
Description
Technical field
The invention belongs to high pressure co-rail system technical field, especially relate to a kind of double-rail type high pressure co-rail system.
Background technique
Diesel engine high-pressure co-rail system fuel injection technic is the oil injection structure new technology being integrated with Computer Control Technology, modern sensor detection technique and advanced person, the main feature of this technology adopts advanced electric control device and is furnished with high-speed solenoid valve, adopt fuel rail pressure accumulation mode fuel feeding, high-speed solenoid valve frequency response is high, control flexibly, and system architecture is transplanted convenient, wide accommodation.Therefore common rail for diesel engine system fuel injection technic is also acknowledged as one of internal-combustion engine industry 20th century three quantum jump.
In prior art, high pressure co-rail system fuel system by the technical development of high pressure Regulation Control to low pressure flow control mode.After adopting low pressure flow control technique, effectively can reduce the recirculating oil quantity of pressure regulator valve, thus improve the efficiency of common rail system.As the layout schematic diagram that Fig. 1 is existing high pressure co-rail system, wherein 1 is high-pressure fuel-feed pump, and 2 is ECU (Electrical Control Unit), and 4 is the first pressure transducer, and 6 is common-rail injector, and 7 is the second fuel rail, and 8 is automatically controlled pressure regulator valve.But low pressure flow control technique only can control the flow of high-pressure oil feed pump intake, uncontrollable high-pressure fuel-feed pump is to moment of fuel rail fuel feeding, flow and rule.The impact of the common-rail injector pulsation oil spout fluctuation that fuel rail is connected on the one hand, be subject to again the impact of high-pressure fuel-feed pump continuous oil supply fluctuation on the other hand, and the oil spout flow of common-rail injector pulsation is greater than the average fuel supply flow rate of high-pressure fuel-feed pump, makes the pressure surge situation in fuel rail very complicated.For keeping the pressure stability of fuel rail, taking method to have: to transfer on fuel rail by pressure regulator valve by high-pressure fuel-feed pump, by allowing high pressure fuel unload, controlling the pressure of fuel rail, this reduces the efficiency of common rail system; Optimize the pressure accumulation volume of fuel rail, need to accept or reject between pressure stability and dynamic response, add optimization difficulty; Optimize automatical control system, add the complexity of automatical control system, but can not overcome evenly, the fuel feeding of small flow and pulsation, large discharge oil spout between contradiction.
Therefore, for improving the pressure stability of fuel rail and the dynamic response of system, need the aspects such as the pressure accumulation volume to fuel rail, pressure regulator valve and electronic control technology to further investigate, difficulty is large, the cycle is long and fuel rail combination property is difficult to balanced.
Summary of the invention
In view of this, the present invention is intended to propose a kind of double-rail type high pressure co-rail system, so that the impact of Fuel injection system on injection process can be overcome, under the condition reducing fuel rail pressure accumulation volume, improve the pressure stability of fuel rail by controlling fuel feeding moment, fuel delivery and fuel supply rate curve, thus reach the effect improving high pressure co-rail system efficiency, pressure stability and dynamic responding speed combination property.
For achieving the above object, technological scheme of the present invention is achieved in that
A kind of double-rail type high pressure co-rail system, comprise high-pressure fuel-feed pump, ECU (Electrical Control Unit), the first fuel rail, the first pressure transducer, the first solenoid valve, common-rail injector, the second fuel rail, automatically controlled pressure regulator valve and the second pressure transducer, described first solenoid valve is arranged on the high-pressure oil passage between the first fuel rail and the second fuel rail, described high-pressure fuel-feed pump is connected by high-pressure oil pipe with the first fuel rail, and described common-rail injector is connected by high-pressure oil pipe with the second fuel rail; Described first pressure transducer is arranged on the first fuel rail, and described second pressure transducer is arranged on the second fuel rail, and the first pressure transducer is all connected by wire harness with ECU (Electrical Control Unit) with the second pressure transducer; The solenoid valve of described common-rail injector, the flow measurement valve of high-pressure fuel-feed pump, the first solenoid valve, automatically controlled pressure regulator valve are all connected by wire harness with ECU (Electrical Control Unit);
Described ECU (Electrical Control Unit) passes through the signal of collection first pressure transducer and the second pressure transducer, export four tunnel control signals, one controls the fuel delivery of high-pressure fuel-feed pump, the injection process of its two control common-rail injector, the oil pump capacity of the automatically controlled pressure regulator valve of its three control, finally by control first solenoid valve, realize the control to system second fuel rail fuel delivery, fuel feeding moment and fuel supply rate curve.
Further, the difference of the goal pressure prestored in the pressure of the first fuel rail that described ECU (Electrical Control Unit) records according to the first pressure transducer obtained and ECU (Electrical Control Unit), export first via signal to the flow measurement valve of high-pressure fuel-feed pump, realize the oil-feeding control of high-pressure fuel-feed pump to the first fuel rail, the pressure of the first fuel rail is reached be greater than the pressure accumulation pressure of desired value 10MPa.
Further, the pressure accumulation volume of described first fuel rail and pressure accumulation pressure are all greater than the second fuel rail.
Further, described first solenoid valve can shift to an earlier date or open with the solenoid valve of common-rail injector simultaneously, and during the unlatching of the first solenoid valve, the fuel injection quantity of personal attendant's common-rail injector adjusts, and is 80% ~ 120% of oil injection duration.
Further, the valve of described first solenoid valve adopts balancing valve structure, and circulation area is identical with the circulation area of the high-pressure oil passage that the first solenoid valve two ends connect.
Relative to prior art, the present invention has following advantage:
(1) by arranging two fuel rails, the first fuel rail is utilized to be connected with high-pressure fuel-feed pump, what realize that fuel oil pressure accumulation and fuel feeding fluctuate is stable, the second fuel rail is utilized to be connected with common-rail injector, realize fuel oil spray with oil spout fluctuate stablize, reduce the impact of high-pressure fuel-feed pump Fuel injection system on injection process;
(2) by the control to the first solenoid valve start-up time and duration, the ACTIVE CONTROL to the second fuel rail fuel delivery, fuel feeding moment and fuel supply rate curve can be realized, then improving the recirculating oil quantity that in turn ensure that the stable of the second fuel oil rail pressure and automatically controlled pressure regulator valve under dynamic response prerequisite, reduce the pressure surge of fuel rail and the recirculating oil quantity of automatically controlled pressure regulator valve;
(3) by reducing the pressure accumulation volume of the second fuel rail be connected with common-rail injector, improve the response time reaching goal pressure, then improve the speed of response under motor variable working condition.
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 layout schematic diagram of existing high pressure co-rail system;
Fig. 2 is the layout schematic diagram of double-rail type high pressure co-rail system described in the embodiment of the present invention.
Description of reference numerals:
1-high-pressure fuel-feed pump, 2-ECU (Electrical Control Unit), 3-first fuel rail, 4-first pressure transducer, 5-first solenoid valve, 6-common-rail injector, 7-second fuel rail, the automatically controlled pressure regulator valve of 8-, 9-second pressure transducer.
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 double-rail type high pressure co-rail system, as shown in Figure 2, comprise high-pressure fuel-feed pump 1, ECU (Electrical Control Unit) 2, first fuel rail 3, first pressure transducer 4, first solenoid valve 5, common-rail injector 6, second fuel rail 7, automatically controlled pressure regulator valve 8 and the second pressure transducer 9, described first solenoid valve 5 to be arranged between the first fuel rail 3 with the second fuel rail 7 and to be connected by high-pressure oil passage, described high-pressure fuel-feed pump 1 is connected by high-pressure oil pipe with the first fuel rail 3, and described common-rail injector 6 is connected by high-pressure oil pipe with the second fuel rail 7; Described first pressure transducer 4 is arranged on the first fuel rail 3, and described second pressure transducer 9 is arranged on the second fuel rail 7, and the first pressure transducer 4 is all connected by wire harness with ECU (Electrical Control Unit) 2 with the second pressure transducer 9; The solenoid valve of described common-rail injector 6, the flow measurement valve of high-pressure fuel-feed pump 1, the first solenoid valve 5, automatically controlled pressure regulator valve 8 are all connected by wire harness with ECU (Electrical Control Unit) 2.
The pressure signal of the first fuel rail 3 that described ECU (Electrical Control Unit) 2 is recorded by analysis first pressure transducer 4 and the difference of goal pressure, export first via signal to the flow measurement valve of high-pressure fuel-feed pump 1, realize the fuel feeding of high-pressure fuel-feed pump 1 to the first fuel rail 3, make the pressure of the first fuel rail 3 reach the pressure accumulation pressure being greater than desired value 10MPa.
Described ECU (Electrical Control Unit) 2, according to engine operating condition demand, exports the second road signal to the solenoid valve of common-rail injector 6, controls the injection process of common-rail injector 6.
Described ECU (Electrical Control Unit) 2 is according to the duty requirements of motor, after the fuel injection quantity calculating common-rail injector 6, in conjunction with the pressure signal that the second pressure transducer 9 is passed back, control the first solenoid valve 5 to open with the solenoid valve of common-rail injector 6 in advance or simultaneously, realize the fuel feeding of the first fuel rail 3 to the second fuel rail 7, by adjusting start-up time and the duration of the first solenoid valve 5, this Fuel injection system can control fuel delivery, fuel feeding moment and fuel supply rate curve.
The start-up time of described first solenoid valve 5 can be identical with the start-up time of the solenoid valve of common-rail injector 6 or in advance, and during the unlatching of the first solenoid valve 5, the fuel injection quantity adjustment of personal attendant's common-rail injector 6, is generally 80% ~ 120% of oil injection duration.
The pressure signal of described ECU (Electrical Control Unit) 2 according to the second pressure transducer 9 and the difference of goal pressure, control the open and close of automatically controlled pressure regulator valve 8, realizes controlling the pressure stability of the second fuel rail 7 and overpressure protection.
The pressure accumulation volume of the first fuel rail 3 of the present invention is suitable with the pressure accumulation volume of conventional fuel rail under identical performance index, the pressure accumulation pressure height 10MPa of the conventional fuel rail of pressure accumulation pressure ratio;
The pressure accumulation volume of the second fuel rail 7 of the present invention is 30% ~ 40% of the pressure accumulation volume of conventional fuel rail under identical performance index, the pressure accumulation pressure of pressure accumulation pressure and conventional fuel rail is suitable, and namely the pressure accumulation volume of the first fuel rail 3 and pressure accumulation pressure are all greater than the second fuel rail 7.
The valve of the first solenoid valve 5 of the present invention adopts balancing valve structure, and circulation area is identical with the circulation area of the high-pressure oil passage that the first solenoid valve 5 two ends connect.
The fuel feeding fluctuation of high-pressure fuel-feed pump 1 of the present invention only has an impact to the first fuel rail 3, the oil spout fluctuation of common-rail injector 6 only has an impact to the second fuel rail 7, by the control of ECU (Electrical Control Unit) 2 to the first solenoid valve 5, realize the ACTIVE CONTROL to the second fuel rail fuel delivery parameters more than 7, the pressure surge in the second fuel rail 7 can be reduced, decrease the recirculating oil quantity of automatically controlled pressure regulator valve 8 simultaneously.
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 (5)
1. a double-rail type high pressure co-rail system, it is characterized in that: comprise high-pressure fuel-feed pump (1), ECU (Electrical Control Unit) (2), first fuel rail (3), first pressure transducer (4), first solenoid valve (5), common-rail injector (6), second fuel rail (7), automatically controlled pressure regulator valve (8) and the second pressure transducer (9), described first solenoid valve (5) is arranged on the high-pressure oil passage between the first fuel rail (3) and the second fuel rail (7), described high-pressure fuel-feed pump (1) is connected by high-pressure oil pipe with the first fuel rail (3), described common-rail injector (6) is connected by high-pressure oil pipe with the second fuel rail (7), described first pressure transducer (4) is arranged on the first fuel rail (3), described second pressure transducer (9) is arranged on the second fuel rail (7), and the first pressure transducer (4) is all connected by wire harness with ECU (Electrical Control Unit) (2) with the second pressure transducer (9), the solenoid valve of described common-rail injector (6), the flow measurement valve of high-pressure fuel-feed pump (1), the first solenoid valve (5), automatically controlled pressure regulator valve (8) are all connected by wire harness with ECU (Electrical Control Unit) (2),
Described ECU (Electrical Control Unit) (2) is by the signal of collection first pressure transducer (4) and the second pressure transducer (9), export four tunnel control signals, one controls the fuel delivery of high-pressure fuel-feed pump (1), the injection process of its two control common-rail injector (6), the recirculating oil quantity of its three automatically controlled pressure regulator valve of control (8), it is four by control first solenoid valve (5), realizes the control to the second fuel rail (7) fuel delivery, fuel feeding moment and fuel supply rate curve.
2. double-rail type high pressure co-rail system according to claim 1, it is characterized in that: the difference of the goal pressure prestored in the pressure of the first fuel rail (3) that described ECU (Electrical Control Unit) (2) records according to the first pressure transducer (4) of obtaining and ECU (Electrical Control Unit) (2), export first via signal to the flow measurement valve of high-pressure fuel-feed pump (1), realize high-pressure fuel-feed pump (1) to the oil-feeding control of the first fuel rail (3), make the pressure of the first fuel rail (3) reach the pressure accumulation pressure being greater than desired value 10MPa.
3. double-rail type high pressure co-rail system according to claim 1, is characterized in that: pressure accumulation volume and the pressure accumulation pressure of described first fuel rail (3) are all greater than the second fuel rail (7).
4. double-rail type high pressure co-rail system according to claim 1, it is characterized in that: described first solenoid valve (5) can shift to an earlier date or open with the solenoid valve of common-rail injector (6) simultaneously, during the unlatching of the first solenoid valve (5), the fuel injection quantity adjustment of personal attendant's common-rail injector (6), is 80% ~ 120% of oil injection duration.
5. double-rail type high pressure co-rail system according to claim 1, it is characterized in that: the valve of described first solenoid valve (5) adopts balancing valve structure, and circulation area is identical with the circulation area of the high-pressure oil pipe that the first solenoid valve (5) two ends connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510931293.XA CN105386914A (en) | 2015-12-11 | 2015-12-11 | Double-rail high-pressure common-rail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510931293.XA CN105386914A (en) | 2015-12-11 | 2015-12-11 | Double-rail high-pressure common-rail system |
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| Publication Number | Publication Date |
|---|---|
| CN105386914A true CN105386914A (en) | 2016-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510931293.XA Pending CN105386914A (en) | 2015-12-11 | 2015-12-11 | Double-rail high-pressure common-rail system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5456233A (en) * | 1993-04-28 | 1995-10-10 | Robert Bosch Gmbh | Fuel injection arrangement for internal combustion engines |
| US5511528A (en) * | 1991-01-14 | 1996-04-30 | Nippondenso Co., Ltd. | Accumulator type of fuel injection device |
| US5727525A (en) * | 1995-10-03 | 1998-03-17 | Nippon Soken, Inc. | Accumulator fuel injection system |
| CN1512053A (en) * | 2002-11-15 | 2004-07-14 | 株式会社电装 | Accumulation type fuel jet system |
| CN101936244A (en) * | 2010-04-29 | 2011-01-05 | 中国第一汽车集团公司无锡油泵油嘴研究所 | Internal combustion engine high pressure fuel system |
| CN104214027A (en) * | 2014-07-30 | 2014-12-17 | 河南科技大学 | Common rail pressure stabilization multi-passage controllable fuel injection system |
-
2015
- 2015-12-11 CN CN201510931293.XA patent/CN105386914A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5511528A (en) * | 1991-01-14 | 1996-04-30 | Nippondenso Co., Ltd. | Accumulator type of fuel injection device |
| US5456233A (en) * | 1993-04-28 | 1995-10-10 | Robert Bosch Gmbh | Fuel injection arrangement for internal combustion engines |
| US5727525A (en) * | 1995-10-03 | 1998-03-17 | Nippon Soken, Inc. | Accumulator fuel injection system |
| CN1512053A (en) * | 2002-11-15 | 2004-07-14 | 株式会社电装 | Accumulation type fuel jet system |
| CN101936244A (en) * | 2010-04-29 | 2011-01-05 | 中国第一汽车集团公司无锡油泵油嘴研究所 | Internal combustion engine high pressure fuel system |
| CN104214027A (en) * | 2014-07-30 | 2014-12-17 | 河南科技大学 | Common rail pressure stabilization multi-passage controllable fuel injection system |
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Application publication date: 20160309 |
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