CN109386415B - Fuel injection system - Google Patents
Fuel injection system Download PDFInfo
- Publication number
- CN109386415B CN109386415B CN201810621654.4A CN201810621654A CN109386415B CN 109386415 B CN109386415 B CN 109386415B CN 201810621654 A CN201810621654 A CN 201810621654A CN 109386415 B CN109386415 B CN 109386415B
- Authority
- CN
- China
- Prior art keywords
- fuel
- fuel injection
- flow
- pressure circuit
- connector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 62
- 238000002347 injection Methods 0.000 title claims abstract description 36
- 239000007924 injection Substances 0.000 title claims abstract description 36
- 239000002828 fuel tank Substances 0.000 claims abstract description 12
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 4
- 230000010355 oscillation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
-
- 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
- F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
- F02M33/02—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel
- F02M33/025—Means not otherwise provided for
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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
- F02M33/00—Other apparatus for treating combustion-air, fuel or fuel-air mixture
- F02M33/02—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel
- F02M33/08—Other apparatus for treating combustion-air, fuel or fuel-air mixture for collecting and returning condensed fuel returning to the fuel tank
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
Abstract
A fuel injection system (100) is disclosed. The system includes a low pressure circuit (102). The low-pressure circuit (102) comprises a fuel tank (104), a fuel filter (106) and a fuel injection pump (108). A flow connector (110) is connected downstream to the filter and upstream to the fuel injection pump (108), and includes a return flow path (113), the return flow path (113) being in flow communication with the fuel tank (104). Excess fuel may be drained from the low pressure circuit (102) by using the flow connector with a return flow path.
Description
Technical Field
The present invention relates to the field of fuel injection systems.
Background
Fuel injection systems with electric feed pumps are known in the art. The electric feed pump delivers the fuel quantity as needed in the rail/fuel distributor block. Fuel from the electric feed pump first flows through the low-pressure circuit before reaching the fuel injection pump. The fuel in the fuel injection pump is pressurized and then flows through the high pressure circuit to reach the rail/fuel distributor block. There are situations where it is no longer necessary to inject fuel into the engine cylinders. For example, when the vehicle coasts downhill, the fuel remaining in the low-pressure circuit no longer needs to be injected. In addition, since the electric feed pump operates at a minimum voltage, there will always be a certain amount of fuel in the low-pressure circuit. Since the fuel remaining in the low-pressure circuit may cause pressure fluctuations in the fuel injection system, it is necessary to drain the remaining fuel from the low-pressure circuit.
Drawings
Various modes of the invention are disclosed in detail in the specification and illustrated in the accompanying drawings, wherein:
fig. 1 illustrates a fuel injection system.
Detailed Description
Fig. 1 illustrates a fuel injection system 100. The system includes a low pressure loop 102. The low-pressure circuit 102 includes a fuel tank 104, a filter 106, and a fuel injection pump 108. The fuel injection system 100 further comprises a flow connector 110, the flow connector 110 being connected downstream to the filter 106 and upstream to the fuel injection pump 108; and a return flow path 113, the return flow path 113 being in flow communication with the fuel tank 104.
The structure of the fuel injection system 100 will be explained in detail. The fuel injection system 100 includes a fuel tank 104. An electric feed pump is located in the fuel tank 104. The electric feed pump supplies fuel to the high-pressure pump in accordance with the amount of fuel required to be supplied to the injectors. Fuel from the electric feed pump flows along a path to the fuel filter 106. From the fuel filter 106, the fuel flows into a fuel injection pump 108. Fuel received in fuel injection pump 108 is pressurized and sent to rail/fuel distributor block 111 for injection into engine cylinders. The portion of the fuel injection system 100 between the fuel tank 104 and the fuel injection pump 108 is referred to as the low-pressure circuit 102, and the portion of the fuel injection system 100 between the fuel injection pump 108 and the common rail is referred to as the high-pressure circuit. Low-pressure circuit 102 includes a flow connector 110 and a return path 113, flow connector 110 being connected downstream to fuel filter 106 and upstream to fuel injection pump 108. The flow connector 110 is a three-way connector. The flow connector 110 includes a throttle 115. The function of the throttle portion is to control the flow of fuel through the return path 113. The restriction in the flow connector is dimensioned to enable draining of the flow from the electric feed pump at a minimum voltage back into the return flow path. In addition, this will reduce pressure oscillations at the inlet of the fuel injection pump and help stabilize the inlet pressure. The return path 113 is in flow communication with the fuel tank 104. The restriction in the connector is sized to drain flow from the electric feed pump at a minimum voltage back into the return path 113. In addition, this will reduce inlet pressure oscillations at the inlet of the fuel injection pump 108 and help stabilize the inlet pressure. The first end 112 of the three-way connector is in flow communication with the fuel tank 104. Fuel received through the first end 112 of the three-way connector flows through the second end 114 to the fuel injection pump 108. The three-way connector has a third end 115 connected to the return path 113. The fuel remaining in the low-pressure circuit 102 is drained back to the fuel tank 104 through the return path 113. Due to the introduction of the flow connector with the throttle in the low-pressure circuit, a small flow at the minimum operating voltage of the electric feed pump can be drained and the flow towards the fuel injection pump can be reduced.
By providing the return flow path 113 in the low-pressure circuit 102, it is possible to prevent excessive fuel from entering the fuel injection pump 108. In addition, by using the flow connector 110 having the return path 113 in the low-pressure circuit 102, the flow to the fuel injection pump 108 will be stabilized. A minimum flow of the electric feed pump is maintained for stable operation.
It should be understood that the embodiments explained in the above description are illustrative only and do not limit the scope of the present invention in terms of type. Many such embodiments are contemplated as well as other modifications and variations made in the embodiments explained in this specification. The scope of the invention is limited only by the scope of the claims.
Claims (3)
1. A fuel injection system (100) comprising at least a low-pressure circuit (102), the low-pressure circuit (102) comprising:
a fuel tank (104), a fuel filter (106), and a fuel injection pump (108), characterized in that
A flow connector (110) connected downstream to the fuel filter (106) and upstream to the fuel injection pump (108); and
a return path (113), the return path (113) being in flow communication with the fuel tank (104),
wherein the restriction in the flow connector is dimensioned to enable draining of flow from the electric feed pump at a minimum voltage back into the return flow path.
2. The fuel injection system (100) of claim 1, wherein the flow connector (110) is a three-way connector.
3. The fuel injection system (100) of claim 1, wherein the flow connector (110) includes a restriction (115).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IN201741021126 | 2017-06-16 | ||
| IN201741021126 | 2017-06-16 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109386415A CN109386415A (en) | 2019-02-26 |
| CN109386415B true CN109386415B (en) | 2022-06-03 |
Family
ID=65417505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810621654.4A Active CN109386415B (en) | 2017-06-16 | 2018-06-15 | Fuel injection system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109386415B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101576037A (en) * | 2008-05-06 | 2009-11-11 | 株式会社电装 | Fuel supply apparatus |
| CN101878352A (en) * | 2007-11-29 | 2010-11-03 | 罗伯特·博世有限公司 | Fuel injection system for an internal combustion engine, comprising a hydrocarbon injector |
| CN103210205A (en) * | 2010-11-15 | 2013-07-17 | 罗伯特·博世有限公司 | Low-pressure circuit for fuel injection system and fuel injection system |
| CN104234892A (en) * | 2013-06-14 | 2014-12-24 | 罗伯特·博世有限公司 | Low-pressure loop of fuel feed device of fuel injection system |
| DE102014223240A1 (en) * | 2014-11-14 | 2016-05-19 | Robert Bosch Gmbh | Low pressure control system of a fuel delivery system of a fuel injection system and a Absteuerventil thereto |
-
2018
- 2018-06-15 CN CN201810621654.4A patent/CN109386415B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101878352A (en) * | 2007-11-29 | 2010-11-03 | 罗伯特·博世有限公司 | Fuel injection system for an internal combustion engine, comprising a hydrocarbon injector |
| CN101576037A (en) * | 2008-05-06 | 2009-11-11 | 株式会社电装 | Fuel supply apparatus |
| CN103210205A (en) * | 2010-11-15 | 2013-07-17 | 罗伯特·博世有限公司 | Low-pressure circuit for fuel injection system and fuel injection system |
| CN104234892A (en) * | 2013-06-14 | 2014-12-24 | 罗伯特·博世有限公司 | Low-pressure loop of fuel feed device of fuel injection system |
| DE102014223240A1 (en) * | 2014-11-14 | 2016-05-19 | Robert Bosch Gmbh | Low pressure control system of a fuel delivery system of a fuel injection system and a Absteuerventil thereto |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109386415A (en) | 2019-02-26 |
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