CN113047985A - Avoid fuel direct contact's fuel heating common rail system - Google Patents
Avoid fuel direct contact's fuel heating common rail system Download PDFInfo
- Publication number
- CN113047985A CN113047985A CN202110424153.9A CN202110424153A CN113047985A CN 113047985 A CN113047985 A CN 113047985A CN 202110424153 A CN202110424153 A CN 202110424153A CN 113047985 A CN113047985 A CN 113047985A
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- China
- Prior art keywords
- fuel
- common rail
- temperature
- heating
- heating rod
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Classifications
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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
- F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
- F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
- F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
- F02M31/125—Fuel
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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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- 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
- F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
Abstract
The invention discloses a fuel heating common rail system for avoiding direct contact of fuel, and belongs to the field of engine fuel supply systems. The invention comprises a common rail body, a heating rod, a temperature sensor, an oil temperature controller, a heating rod electrode and an oil inlet pipe; the common rail body comprises an arc-shaped cavity, a branch cavity, a fuel inlet and a central through hole; the fuel inlet pipe is connected with the fuel inlet; the heating rod is arranged in the central through hole; the temperature sensor is arranged in the branch cavity; the right end of the heating rod is connected with the heating rod electrode; the temperature sensor is electrically connected with the oil temperature controller. The invention adopts a non-contact mode, and indirectly heats the fuel through the common rail body, thereby ensuring the safety of the heating process. The temperature sensor is arranged at the position close to the interface of the fuel injector, the detected oil temperature is closer to the fuel injection temperature, and more accurate oil temperature control can be realized.
Description
Technical Field
The invention relates to the field of oil supply systems of engines, in particular to a fuel heating common rail system for avoiding direct contact of fuel.
Background
Due to the increasingly stringent emission regulations, gasoline engines have developed a tendency to be supercharged and miniaturized, and direct injection technology has been introduced into gasoline engines. The new problem of the gasoline engine that the high-pressure fuel is directly sprayed into the combustion chamber by the direct injection technology and is highlighted is that the fuel is sprayed into the cylinder at a higher injection pressure under the working condition of insufficient evaporation, and the fuel still exists in a liquid form when the flame is spread to the position, so that the problem of soot emission is caused. To ameliorate this problem, flash-boil spraying has recently become one of the major hotspots explored by related academia and industry due to its unique atomization mechanism and oil bundle characteristics. The flash boiling spray can directly utilize a fuel oil phase change mechanism, when the fuel is heated to a high temperature and is sprayed to a low-temperature pressure environment, the temperature of the fuel is easily higher than the boiling point of the fuel to achieve an overheating condition, a droplet micro-explosion phenomenon is formed after the fuel is sprayed out of a fuel injector, the fuel is rapidly gasified to form flash boiling spray, the atomization effect of the spray is directly enhanced, and then lower emission and better fuel oil economy are realized. However, in the past, heating solutions have mostly involved designing an electrical heating element inside the injector nozzle, by means of which fuel is heated. Although the scheme can also realize the effects of fuel heating and flash boiling, the cost of the fuel system is greatly increased due to the need of redesigning the fuel injector and the increase of the complexity of the fuel injector. In the scheme, the fuel oil is directly contacted with the high-temperature heating rod, so that local overheating is easy to occur, and the danger is greatly increased.
Therefore, those skilled in the art have endeavored to develop a new fuel heating common rail system to solve this technical problem.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the technical problem to be solved by the present invention is to improve the safety of the fuel being heated before injection and to increase the heating efficiency.
In order to achieve the aim, the invention provides a fuel heating common rail system for avoiding direct contact of fuel, which comprises a common rail body, a heating rod, a temperature sensor, an oil temperature controller, a heating rod electrode and an oil inlet pipe, wherein the common rail body is provided with a heating rod; the common rail body comprises an arc-shaped cavity, a branch cavity, a fuel inlet and a central through hole; the fuel inlet pipe is connected with the fuel inlet; the heating rod is arranged in the central through hole; the temperature sensor is arranged in the branch cavity; the right end of the heating rod is connected with the heating rod electrode; the temperature sensor is electrically connected with the oil temperature controller.
Further, the branch cavities are several.
Furthermore, the plurality of branch cavities are respectively connected with the oil nozzles of the corresponding oil cylinders.
Further, each of the branch chambers is equipped with one of the temperature sensors.
Further, the temperature sensor is installed in a plug-in mode.
Furthermore, the plurality of temperature sensors are respectively connected with the oil temperature controller through signal lines.
Further, the inner wall of the central through hole of the common rail body is coated with a heat conduction layer for reducing heat conduction resistance.
Further, high-pressure fuel enters the arc-shaped cavity and the branch cavity from the fuel inlet, a power supply of the heating rod is started, the heating rod is electrified to generate heat, heat is transferred through the common rail body structure, and the high-pressure fuel in the arc-shaped cavity and the branch cavity is heated; the temperature sensor measures the temperature of the high-pressure fuel and transmits temperature data to the oil temperature controller.
Further, the oil temperature controller receives temperature signal input of the temperature sensor, calculates a difference value between the fuel oil temperature measured by the temperature sensor and a set target temperature through a PID control module in the oil temperature controller to obtain a corresponding control signal, converts the control signal into a certain voltage value, sends the certain voltage value to the heating rod electrode, and changes heating power by controlling voltages at two ends of the heating rod electrode so as to control the temperature of the high-pressure fuel oil.
Furthermore, the fuel temperature acquisition and the control signal output are both instant processes, and the continuous accurate control of the fuel temperature can be realized.
Compared with the prior mode that most of electrically heated fuel oil is directly contacted with the fuel oil by an electric heating wire, the non-contact type fuel oil heating device has the advantages that the heat exchange area is small, electric leakage exists, and potential safety hazards such as explosion and the like are caused by overhigh local temperature of the fuel oil. The temperature sensor is arranged at the position close to the interface of the fuel injector, the oil path between the temperature sensor and the nozzle of the fuel injector is shorter, the heat transfer loss of fuel oil in the oil path is less, the detected oil temperature is closer to the fuel oil injection temperature, and more accurate oil temperature control can be realized.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a schematic illustration of a fuel heated common rail system that avoids direct fuel contact in accordance with a preferred embodiment of the present invention;
the fuel rail comprises a common rail body 1, a heating rod 2, a temperature sensor 3, an oil temperature controller 4, a heating rod electrode 5, an oil inlet pipe 6, an arc-shaped cavity 11, a branch cavity 12, a fuel inlet 13 and a central through hole 14.
Detailed Description
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
In the drawings, structurally identical elements are represented by like reference numerals, and structurally or functionally similar elements are represented by like reference numerals throughout the several views. The size and thickness of each component shown in the drawings are arbitrarily illustrated, and the present invention is not limited to the size and thickness of each component. The thickness of the components may be exaggerated where appropriate in the figures to improve clarity.
As shown in fig. 1, a fuel heating common rail system for preventing direct contact of fuel comprises a common rail body 1, a heating rod 2, a temperature sensor 3, an oil temperature controller 4, a heating rod electrode 5 and an oil inlet pipe 6; the common rail body 1 comprises an arc-shaped cavity 11, a branch cavity 12, a fuel inlet 13 and a central through hole 14; the oil inlet pipe 6 is connected with a fuel inlet 13; the heating rod 2 is arranged in the central through hole 14; the temperature sensor 3 is arranged in the branch cavity 12; the right end of the heating rod 2 is connected with a heating rod electrode 5; the temperature sensor 3 is electrically connected to the oil temperature controller 4. There are several branch chambers 12. The plurality of branch cavities 12 are respectively connected with oil nozzles of the corresponding oil cylinders. Each branch chamber 12 is equipped with a temperature sensor 3. The temperature sensor 3 is mounted by insertion. The plurality of temperature sensors 3 are respectively connected with the oil temperature controller 4 through signal lines. The inner wall of the central through hole 14 of the common rail body 1 is coated with a heat conduction layer for reducing heat conduction resistance. High-pressure fuel enters the arc-shaped cavity 11 and the branch cavity 12 from the fuel inlet 13, the power supply of the heating rod 2 is started, the heating rod 2 is electrified to generate heat, heat is transferred through the common rail body 1 structure, and the high-pressure fuel in the arc-shaped cavity 11 and the branch cavity 12 is heated; the temperature sensor 3 measures the high-pressure fuel temperature and transmits temperature data to the fuel temperature controller 4. The oil temperature controller 4 receives the temperature signal input of the temperature sensor 3, calculates the difference value between the fuel oil temperature measured by the temperature sensor 3 and the set target temperature through a PID control module in the oil temperature controller 4 to obtain a corresponding control signal, converts the control signal into a certain voltage value, sends the certain voltage value to the heating rod electrode 5, and changes the heating power by controlling the voltage at two ends of the heating rod electrode 5, thereby controlling the temperature of the high-pressure fuel oil. The fuel temperature acquisition and the control signal output are both instant processes, and the continuous accurate control of the fuel temperature can be realized.
The common rail body 1 of the invention is hollow, the inner diameter of the central through hole 14 is slightly larger than the outer diameter of the heating rod 2, so that the heating rod 2 can be inserted, and the heat transfer effect between the heating rod and the heating rod is ensured. The common rail body 1 is directly heated through the heating rod 2, so that fuel oil in the common rail body 1 is heated, and flashing spraying is realized; after cold high-pressure fuel enters the common rail body 1 through the fuel inlet pipe 6 and the fuel inlet 13, the temperature is raised under the action of heat convection of the common rail body 1 in a high-temperature state, the fuel enters the branch cavities 12 of the common rail body 1 after being heated, the temperature sensors 3 can measure the temperature of the fuel in the common rail body 1 and transmit temperature data to the oil temperature controller 4, then the oil temperature controller 4 determines the heating power by calculating the difference value between the target temperature and the temperature of the fuel in the common rail measured by the temperature sensors 3, and the voltage at two ends of the heating rod electrode 5 is controlled to control the heating power of the heating rod 2, so that the control of the fuel temperature is realized.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A fuel heating common rail system for avoiding direct contact of fuel is characterized by comprising a common rail body, a heating rod, a temperature sensor, an oil temperature controller, a heating rod electrode and an oil inlet pipe; the common rail body comprises an arc-shaped cavity, a branch cavity, a fuel inlet and a central through hole; the fuel inlet pipe is connected with the fuel inlet; the heating rod is arranged in the central through hole; the temperature sensor is arranged in the branch cavity; the right end of the heating rod is connected with the heating rod electrode; the temperature sensor is electrically connected with the oil temperature controller.
2. A fuel heating common rail system for preventing direct contact of fuel as set forth in claim 1, wherein said branch chamber is plural.
3. A fuel heating common rail system for preventing direct contact of fuel as set forth in claim 1, wherein a plurality of said branch chambers are connected to fuel injection nozzles of respective cylinders.
4. A fuel heating common rail system for avoiding direct contact of fuel as set forth in claim 1, wherein each of said branch chambers is provided with one of said temperature sensors.
5. A fuel heating common rail system for avoiding direct contact of fuel as set forth in claim 1, wherein said temperature sensor is installed by insertion.
6. A fuel heating common rail system for preventing direct contact of fuel as set forth in claim 1, wherein a plurality of said temperature sensors are connected to said oil temperature controller through signal lines, respectively.
7. A fuel heating common rail system for avoiding direct contact of fuel as set forth in claim 1, wherein said inner wall of said central through hole of said common rail body is coated with a heat conductive layer for reducing heat conductive resistance.
8. A fuel heating common rail system for avoiding direct contact of fuel according to claim 1, wherein high pressure fuel enters said arc-shaped cavity and said branch cavity from said fuel inlet, power supply to said heating rod is turned on, said heating rod is electrified to generate heat, heat is transferred through said common rail body structure, and said high pressure fuel in said arc-shaped cavity and said branch cavity is heated; the temperature sensor measures the temperature of the high-pressure fuel and transmits temperature data to the oil temperature controller.
9. A fuel heating common rail system for avoiding direct contact of fuel as claimed in claim 8, wherein said oil temperature controller receives input of temperature signal of said temperature sensor, calculates difference between fuel temperature measured by said temperature sensor and set target temperature by PID control module in said oil temperature controller to obtain corresponding control signal, and converts said control signal into a certain voltage value to be sent to said heating rod electrode, and changes heating power by controlling voltage at both ends of said heating rod electrode, thereby controlling temperature of said high pressure fuel.
10. A fuel heating common rail system for avoiding direct contact of fuel as claimed in claim 9, wherein the fuel temperature collection and the control signal output are both instant processes, and accurate control of the continuity of the fuel temperature can be realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110424153.9A CN113047985A (en) | 2021-04-20 | 2021-04-20 | Avoid fuel direct contact's fuel heating common rail system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110424153.9A CN113047985A (en) | 2021-04-20 | 2021-04-20 | Avoid fuel direct contact's fuel heating common rail system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113047985A true CN113047985A (en) | 2021-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110424153.9A Pending CN113047985A (en) | 2021-04-20 | 2021-04-20 | Avoid fuel direct contact's fuel heating common rail system |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202047037U (en) * | 2011-04-18 | 2011-11-23 | 金银 | Electric heating oil refining equipment |
| CN204024895U (en) * | 2014-02-11 | 2014-12-17 | 四川欧瑞迪能源有限公司 | A kind of novel cold start device of methanol automobile |
| CN106150804A (en) * | 2016-08-30 | 2016-11-23 | 上海交通大学 | A kind of fuel Heating oil rail and utilization oil rail realize the method that fuel oil dodges boiling spraying |
| KR101682503B1 (en) * | 2014-12-01 | 2016-12-12 | 주식회사 현대케피코 | Fuel-Rail Assembly for Vehicle |
| CN106593728A (en) * | 2016-12-27 | 2017-04-26 | 奇瑞汽车股份有限公司 | Fuel rail assembly of gasoline engine |
| DE102017222931A1 (en) * | 2017-12-15 | 2019-06-19 | Robert Bosch Gmbh | Fuel delivery device for an internal combustion engine |
| CN112177814A (en) * | 2020-09-27 | 2021-01-05 | 同济大学 | Biodiesel oil injection preheating high-pressure common rail injection system |
-
2021
- 2021-04-20 CN CN202110424153.9A patent/CN113047985A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202047037U (en) * | 2011-04-18 | 2011-11-23 | 金银 | Electric heating oil refining equipment |
| CN204024895U (en) * | 2014-02-11 | 2014-12-17 | 四川欧瑞迪能源有限公司 | A kind of novel cold start device of methanol automobile |
| KR101682503B1 (en) * | 2014-12-01 | 2016-12-12 | 주식회사 현대케피코 | Fuel-Rail Assembly for Vehicle |
| CN106150804A (en) * | 2016-08-30 | 2016-11-23 | 上海交通大学 | A kind of fuel Heating oil rail and utilization oil rail realize the method that fuel oil dodges boiling spraying |
| CN106593728A (en) * | 2016-12-27 | 2017-04-26 | 奇瑞汽车股份有限公司 | Fuel rail assembly of gasoline engine |
| DE102017222931A1 (en) * | 2017-12-15 | 2019-06-19 | Robert Bosch Gmbh | Fuel delivery device for an internal combustion engine |
| CN112177814A (en) * | 2020-09-27 | 2021-01-05 | 同济大学 | Biodiesel oil injection preheating high-pressure common rail injection system |
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