CN208845276U - A kind of variable injection rate diesel injection system used for diesel engine - Google Patents
A kind of variable injection rate diesel injection system used for diesel engine Download PDFInfo
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- CN208845276U CN208845276U CN201821228577.8U CN201821228577U CN208845276U CN 208845276 U CN208845276 U CN 208845276U CN 201821228577 U CN201821228577 U CN 201821228577U CN 208845276 U CN208845276 U CN 208845276U
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Abstract
The utility model is a kind of variable injection rate diesel injection system used for diesel engine.The system includes high-pressure oil pump, low pressure oil rail, high pressure oil rail, electric-controlled fuel injector I, II, check valve and ECU；High-pressure oil pump is connect with low pressure oil rail and high pressure oil rail respectively；Electric-controlled fuel injector I is arranged above engine chamber；Electric-controlled fuel injector II is arranged in the pipeline between high pressure oil rail and electric-controlled fuel injector I；Check valve is arranged in the pipeline between low pressure oil rail and electric-controlled fuel injector I；ECU is connected by electric wire with high-pressure oil pump, low pressure oil rail, high pressure oil rail, electric-controlled fuel injector I, II.The utility model is a kind of variable injection rate diesel injection system used for diesel engine, while realizing that diesel injection pressures are unrelated with engine speed, using two oily rails, two electric-controlled fuel injectors of single cylinder, to realize in single injection process that injection pressure is low and High variation, being finally reached ideal continuous flexible can be changed injection rate.
Description
Technical field
The utility model belongs to diesel injection system technical field used for diesel engine, specifically a kind of diesel engine
The variable injection rate diesel injection system of machine.
Background technique
Increasingly strict with emission regulation, the limit value of exhaust contaminant is lower and lower, especially diesel exhaust gas in recent years
The limit value of pollutant (mainly particle and oxynitrides) has reached state five or state six is horizontal.It is above-mentioned in order to realize while reduce
Two kinds of exhaust contaminants make engine emission reach the requirement of emission regulation, and Electrocontrolled high-pressure common rail spraying technique, which becomes, meets row
Put one of the implementation strategy of regulation.
Electrocontrolled high-pressure common rail spraying technique refers to the closed loop system of high-pressure oil pump, high pressure oil rail, pressure sensor and ECU composition
System, by the generation and course of injection of spraying pressure a kind of injection mode completely separate from each other；High-pressure oil pump is defeated high-pressure diesel
It is sent in high pressure oil rail, accurate control is realized to the diesel pressure in high pressure oil rail, reach injection pressure size and engine turns
The unrelated purpose of speed, can exclude dependence of the non-common rail diesel engine injection pressure to engine speed.
Electronic control system is mainly by electronic control unit, high-pressure oil pump, high pressure oil rail, electric-controlled fuel injector and various biographies
The composition such as sensor.Electric-controlled fuel injector is that most critical and most complicated component, its effect are roots in co-rail diesel spraying system
According to the control signal that ECU is issued, opening and closing by control solenoid valve, by the diesel oil in high pressure oil rail with optimal oil spout
Moment and distributive value spray into the combustion chamber of diesel engine.
In single injection process, conventional co-rail oil injection system injection pressure is invariable, so that electric-controlled fuel injector main jet
Injection rate shape is only rectangle, this characteristic has direct influence for the burning of engine, fuel economy and combustion noise,
It is not able to satisfy the best demand of engine full working scope.
Summary of the invention
The utility model provides a kind of variable injection rate diesel injection system used for diesel engine, is realizing diesel injection
While pressure is unrelated with engine speed, using two oily rails, two electric-controlled fuel injectors of single cylinder, to realize single injection process
Middle injection pressure is low and High variation, and being finally reached ideal continuous flexible can be changed injection rate, and injection rate shape meets engine
Full working scope demand solves the above-mentioned deficiency of existing diesel injection system.
Technical solutions of the utility model are described with reference to the drawings as follows:
A kind of variable injection rate diesel injection system used for diesel engine, which includes high-pressure oil pump 1, low pressure oil rail
2, high pressure oil rail 3, electric-controlled fuel injector II4, electric-controlled fuel injector I 5, check valve 6 and electronic control unit ECU7；The high pressure oil
Pump 1 passes through piping connection with low pressure oil rail 2 and high pressure oil rail 3 respectively；The electric-controlled fuel injector I 5 is arranged in engine combustion
10 top of room；The electric-controlled fuel injector II4 is arranged in the pipeline between high pressure oil rail 3 and electric-controlled fuel injector I 5；Described
Check valve 6 is arranged in the pipeline between low pressure oil rail 2 and electric-controlled fuel injector I 5；The electronic control unit ECU7 passes through electricity
Line is connected with high-pressure oil pump 1, low pressure oil rail 2, high pressure oil rail 3, electric-controlled fuel injector II4 and electric-controlled fuel injector I 5；Described is automatically controlled
Electric current between fuel injector II4 and electronic control unit ECU7 is electric-controlled fuel injector II driving current 8；The electric-controlled fuel injector
Electric current between I 5 and electronic control unit ECU7 is I driving current 9 of electric-controlled fuel injector.
The entrance of the low pressure oil rail 2 is connected with the low pressure fuel pump oil outlet in high-pressure oil pump 1；The low pressure oil rail
2 outlet is connected with the entrance of check valve 6；The entrance and the high-pressure oil pump oil outlet in high-pressure oil pump 1 of the high pressure oil rail 3
It is connected；The outlet of the high pressure oil rail 3 is connected with the entrance of electric-controlled fuel injector II4.
The utility model has the following beneficial effects: the utility model is in order to realize the reduction of oil consumption and discharge, the full work of engine
The a variety of fuel injection characteristics of trapezoidal, boot-shaped, rectangle are needed under condition, conventional common rail system can only realize a kind of rectangle fuel injection characteristic, to hair
Oil consumption drops in motivation and discharge is unfavorable.The utility model can be realized a variety of flexible variable fuel injection characteristics of trapezoidal, boot-shaped, rectangle, energy
Meet the needs of engine full working scope is to fuel injection characteristic, realize the reduction of oil consumption and discharge, oil can drop in relatively conventional common rail system
Consumption 3% or so.Simultaneously because the variation of fuel injection characteristic, relatively conventional system can reduce peak injection pressure, and then reduce high
Pressure oil pump drives peak torque, reduces high-pressure oil pump internal drive system design difficulty, promotes high-pressure oil pump internal drive system
Reliability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of variable injection rate diesel injection system used for diesel engine in the utility model；
Fig. 2 is electric-controlled fuel injector II driving current schematic diagram in the utility model；
Fig. 3 is I driving current schematic diagram of electric-controlled fuel injector in the utility model.
In figure, 1, high-pressure oil pump；2, low pressure oil rail；3, high pressure oil rail；4, electric-controlled fuel injector II；5, electric-controlled fuel injector I；6,
Check valve；7, electronic control unit ECU；8, electric-controlled fuel injector II driving current；9, I driving current of electric-controlled fuel injector；10, start
Machine combustion chamber.
Specific embodiment
Refering to fig. 1, Fig. 2 and Fig. 3, a kind of variable injection rate diesel injection system used for diesel engine, the system include
High-pressure oil pump 1, low pressure oil rail 2, high pressure oil rail 3, electric-controlled fuel injector II4, electric-controlled fuel injector I 5, check valve 6 and electronic control are single
First ECU7.
The high-pressure oil pump 1 passes through piping connection with low pressure oil rail 2 and high pressure oil rail 3 respectively；The electronic control injection
Device I 5 is arranged above engine chamber 10, and diesel oil is sprayed into combustion chamber；The electric-controlled fuel injector II4 is arranged in high pressure
In pipeline between oily rail 3 and electric-controlled fuel injector I 5, diesel oil is sprayed into electric-controlled fuel injector I 5；The setting of check valve 6 exists
In pipeline between low pressure oil rail 2 and electric-controlled fuel injector I 5, is connected from oily rail to I side of electric-controlled fuel injector, reversely then closes；It is described
Electronic control unit ECU7 pass through electric wire and high-pressure oil pump 1, low pressure oil rail 2, high pressure oil rail 3, electric-controlled fuel injector II4 and automatically controlled
Fuel injector I 5 is connected；Electric current between the electric-controlled fuel injector II4 and electronic control unit ECU7 is electric-controlled fuel injector II drive
Streaming current 8；Electric current between the electric-controlled fuel injector I 5 and electronic control unit ECU7 is I driving current 9 of electric-controlled fuel injector.
The entrance of the low pressure oil rail 2 is connected with the low pressure fuel pump oil outlet in high-pressure oil pump 1；The low pressure oil rail
2 outlet is connected with the entrance of check valve 6；The entrance and the high-pressure oil pump oil outlet in high-pressure oil pump 1 of the high pressure oil rail 3
It is connected；The outlet of the high pressure oil rail 3 is connected with the entrance of electric-controlled fuel injector II4.
A kind of variable injection rate diesel injection system method used for diesel engine, method includes the following steps:
Step 1: it is electronic control injection that the electronic control unit ECU7 control electric-controlled fuel injector I 5 and check valve 6, which are opened,
I driving current 9 of device and check valve 6 are opened, and electric-controlled fuel injector I 5 is sprayed with pressure in low pressure oil rail 2；
Step 2: it is electricity that electronic control unit ECU7, which controls electric-controlled fuel injector II4 and opens, after 2000~3000us of oil spout
It controls fuel injector II driving current 8 to open, under pressure difference effect, check valve 6 is closed, and electric-controlled fuel injector I 5 is in high pressure oil rail 3
Pressure is sprayed；
Step 3: electric-controlled fuel injector I 5 and electric-controlled fuel injector II4 are simultaneously closed off after 1000~2000us.
The low pressure oil rail 2 establishes the pressure of 500bar~1200bar under the effect of high-pressure oil pump 1.
The high pressure oil rail 3 establishes the pressure of 1000bar~2200bar under the effect of high-pressure oil pump 1.
The a length of 3000 μ μ of s~5000 s, the electronic control injection when described I 9 open and close of driving current of electric-controlled fuel injector
A length of 1000 μ s~2000 μ s when device II 8 open and close of driving current, and I driving current of electric-controlled fuel injector, 9 close moment and electricity
It is identical to control 8 close moments of fuel injector II driving current.
Electronic control unit ECU7 presses the control MAP control high-pressure oil pump demarcated, and passes through the pressure sensor on oily rail
Realize the stable closed loop control of diesel injection pressures；High-pressure oil pump 1 controls low pressure oil rail 2 and high pressure oil rail 3 respectively, realizes two
The one of oily rail is low, a high constant pressure.Electronic control unit ECU7 presses the control MAP control electric-controlled fuel injector I 5 demarcated and opens
And closing, the control of injection timing and distributive value is realized according to engine operating condition demand；Electronic control unit presses the control MAP demarcated
Control electric-controlled fuel injector II4 open and close, electric-controlled fuel injector II4 unlatching before, low rail pressure chamber always with electric-controlled fuel injector I 5
It communicates, injection pressure is equal to low rail pressure pressure, and after electric-controlled fuel injector II4 is opened, check valve 6 is closed, low rail pressure and automatically controlled spray
Oily I 5 channel of device is cut off, and high rail pressure is connected to by electric-controlled fuel injector II4 with electric-controlled fuel injector I 5, and injection pressure is equal to height at this time
Rail pressure pressure realizes that ideal continuous flexible can be changed injection rate.
Embodiment one: low pressure oil rail 2 establishes 500bar pressure under the effect of high-pressure oil pump 1, and high pressure oil rail 3 is in high-pressure oil pump
1000bar pressure is established under 1 effect, electronic control unit ECU7 controls electric-controlled fuel injector I 5 and opens 3000us, electricity after 2000us
Electronic control unit ECU7 controls automatically controlled spray when sub-control unit ECU7 controls electric-controlled fuel injector II4 unlatching 1000us, 3000us
Oily device I 5 and electric-controlled fuel injector II4 are simultaneously closed off.
Embodiment two: low pressure oil rail 2 establishes 1200bar pressure under the effect of high-pressure oil pump 1, and high pressure oil rail 3 is in high pressure oil
2200bar pressure is established under 1 effect of pump, after electronic control unit ECU7 controls the unlatching of electric-controlled fuel injector I 5 5000us, 3000us
Electronic control unit ECU7 control is automatically controlled when electronic control unit ECU7 controls electric-controlled fuel injector II4 unlatching 2000us, 5000us
Fuel injector I 5 and electric-controlled fuel injector II4 are simultaneously closed off.
Embodiment three: low pressure oil rail 2 establishes 850bar pressure under the effect of high-pressure oil pump 1, and high pressure oil rail 3 is in high-pressure oil pump
1600bar pressure is established under 1 effect, electronic control unit ECU7 controls electric-controlled fuel injector I 5 and opens 4000us, electricity after 2500us
Electronic control unit ECU7 controls automatically controlled spray when sub-control unit ECU7 controls electric-controlled fuel injector II4 unlatching 1500us, 4000us
Oily device I 5 and electric-controlled fuel injector II4 are simultaneously closed off.
Claims (2)
1. a kind of variable injection rate diesel injection system used for diesel engine, which is characterized in that the system includes high-pressure oil pump
(1), low pressure oil rail (2), high pressure oil rail (3), electric-controlled fuel injector II (4), electric-controlled fuel injector I (5), check valve (6) and electronics control
Unit ECU (7) processed；The high-pressure oil pump (1) passes through piping connection with low pressure oil rail (2) and high pressure oil rail (3) respectively；It is described
Electric-controlled fuel injector I (5) setting above the engine chamber (10)；The electric-controlled fuel injector II (4) is arranged in high pressure oil
In pipeline between rail (3) and electric-controlled fuel injector I (5)；The check valve (6) is arranged in low pressure oil rail (2) and electronic control injection
In pipeline between device I (5)；The electronic control unit ECU (7) by electric wire and high-pressure oil pump (1), low pressure oil rail (2),
High pressure oil rail (3), electric-controlled fuel injector II (4) are connected with electric-controlled fuel injector I (5)；The electric-controlled fuel injector II (4) and electronics control
Electric current between unit ECU (7) processed is electric-controlled fuel injector II driving current (8)；The electric-controlled fuel injector I (5) and electronics control
Electric current between unit ECU (7) processed is I driving current of electric-controlled fuel injector (9).
2. one kind variable injection rate diesel injection system used for diesel engine according to claim 1, which is characterized in that
The entrance of the low pressure oil rail (2) is connected with the low pressure fuel pump oil outlet in high-pressure oil pump (1)；The low pressure oil rail (2)
Outlet be connected with the entrance of check valve (6)；The entrance and the high-pressure oil pump in high-pressure oil pump (1) of the high pressure oil rail (3)
Oil outlet is connected；The outlet of the high pressure oil rail (3) is connected with the entrance of electric-controlled fuel injector II (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821228577.8U CN208845276U (en) | 2018-08-01 | 2018-08-01 | A kind of variable injection rate diesel injection system used for diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821228577.8U CN208845276U (en) | 2018-08-01 | 2018-08-01 | A kind of variable injection rate diesel injection system used for diesel engine |
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| CN208845276U true CN208845276U (en) | 2019-05-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821228577.8U Active CN208845276U (en) | 2018-08-01 | 2018-08-01 | A kind of variable injection rate diesel injection system used for diesel engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113885A (en) * | 2018-08-01 | 2019-01-01 | 汽解放汽车有限公司 | One kind variable injection rate diesel injection system used for diesel engine and injection method |
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2018
- 2018-08-01 CN CN201821228577.8U patent/CN208845276U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109113885A (en) * | 2018-08-01 | 2019-01-01 | 汽解放汽车有限公司 | One kind variable injection rate diesel injection system used for diesel engine and injection method |
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