CN215370067U - Active supercharging EGR system - Google Patents
Active supercharging EGR system Download PDFInfo
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- CN215370067U CN215370067U CN202120882882.4U CN202120882882U CN215370067U CN 215370067 U CN215370067 U CN 215370067U CN 202120882882 U CN202120882882 U CN 202120882882U CN 215370067 U CN215370067 U CN 215370067U
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Abstract
The utility model discloses an active supercharging EGR (exhaust gas recirculation) system, which comprises an EGR air inlet pipeline, an EGR exhaust pipeline, a nitrogen-oxygen sensor, a temperature sensor, an ECU (electronic control unit) and an EGR cooler, wherein an EGR active supercharging device is arranged between the EGR air inlet pipeline and the EGR exhaust pipeline, and the EGR active supercharging device is arranged at the hot end of the EGR cooler or the cold end of the EGR cooler; when the pressure of the EGR exhaust pipeline is not enough to push the exhaust gas into the EGR air inlet pipeline, the EGR active supercharging device boosts the pressure of the exhaust gas to ensure the stability of the pressure difference on two sides of the EGR cooler. The utility model has simple structure and lower cost, optimizes the control strategy, compresses the waste gas to a certain pressure through the diesel engine running information collected by the ECU when the pressure before the vortex is not enough to drive the waste gas to flow into the intercooling rear pipeline from the exhaust manifold, and then enters the intercooling rear pipeline. The best engine emission and power performance indexes are realized.
Description
Technical Field
The utility model relates to an active supercharging EGR system, in particular to an exhaust gas recirculation EGR system, and belongs to the technical field of diesel engines.
Background
Compared with the national V technology, the national VI standard has stricter emission limit on the diesel engine, and the utilization of the exhaust gas recirculation EGR technology is one of the main measures for reducing the NOx emission of the diesel engine at present. The EGR technology is one of key parts for ensuring that the diesel engine meets the emission requirement, and whether the EGR works normally or not directly influences the economy of the diesel engine and even influences the emission of the whole vehicle. The existing EGR system, especially the high pressure EGR system, takes high pressure exhaust gas from the exhaust manifold in front of the supercharger, and after cooling by the EGR cooler, the exhaust gas enters the intercooling intake pipe with relatively low pressure. And only when the pressure of the exhaust gas before the vortex and the pressure of the after-intercooling pipeline form enough pressure difference, enough exhaust gas can be ensured to enter the after-intercooling pipeline through the EGR system and be mixed to enter the cylinder for participating in combustion. To provide sufficient pressure differential, smaller superchargers are often selected at the expense of supercharger efficiency to increase the preswirl pressure at mid-low speeds and part load. The small supercharger is selected, so that the efficiency of the supercharger at high rotating speed and high load is sacrificed, and the pumping loss of the diesel engine is increased.
Disclosure of Invention
The utility model aims to solve the technical problem of providing an active supercharging EGR system aiming at the defects in the prior art.
In order to solve the technical problem, the utility model provides an active supercharging EGR system, which comprises an EGR air inlet pipeline, an EGR exhaust pipeline, a nitrogen-oxygen sensor, a temperature sensor, an ECU (electronic control unit) and an EGR cooler, wherein an EGR active supercharging device is arranged between the EGR air inlet pipeline and the EGR exhaust pipeline, and the EGR active supercharging device is arranged at the hot end of the EGR cooler or the cold end of the EGR cooler; when the pressure of the EGR exhaust pipeline is not enough to push the exhaust gas into the EGR air inlet pipeline, the EGR active supercharging device boosts the pressure of the exhaust gas to ensure the stability of the pressure difference on two sides of the EGR cooler.
The ECU calculates the required supercharging requirement according to the exhaust data measured by the temperature sensor and the nitrogen-oxygen sensor, and transmits a target supercharging signal to the EGR active supercharging device, and the EGR active supercharging device completes the supercharging of the exhaust gas, so that the EGR rate of the engine under any working condition can be adjusted and controlled.
Has the advantages that: the utility model has simple structure and lower cost, optimizes the control strategy, compresses the waste gas to a certain pressure through the diesel engine running information collected by the ECU when the pressure before the vortex is not enough to drive the waste gas to flow into the intercooling rear pipeline from the exhaust manifold, and then enters the intercooling rear pipeline. And proper amount of EGR is controlled in time, so that NOX emission is controlled better, and the optimal engine emission and power performance indexes are realized.
Drawings
FIG. 1 is a control circuit diagram of an EGR system arranged at the cold end of an EGR gas flow direction and active supercharging device according to the present invention;
FIG. 2 is a control circuit diagram of an EGR system arranged at the hot end of an EGR gas flow direction and active supercharging device according to the present invention.
In the figure: 1 supercharging requirement, 2EGR active supercharging device, 3 exhaust pressure, 4 after-cold intake temperature and pressure, 5 engine speed and power, 6EGR intake pipeline, 7EGR exhaust pipeline, 8 supercharger turbine, 9 supercharger pinch roller, 10 nitrogen oxygen sensor, 11ECU and 12EGR cooler.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1 and 2, the present invention includes an EGR active supercharging device 2, an EGR cooler 12, an EGR intake line 6, an EGR exhaust line 7, an ECU11, a nitrogen oxygen sensor 10, and a temperature sensor.
As can be seen from fig. 1 and 2, an EGR active supercharging device 2 is arranged between the EGR inlet line 6 and the EGR outlet line 7, and the EGR active supercharging device 2 is arranged at the hot end of the EGR cooler 12 (shown in fig. 2) or at the cold end of the EGR cooler 12 (shown in fig. 1). When the exhaust pressure 3 of the EGR exhaust pipe 7 is obviously greater than the pressure of the EGR intake pipe 6 (the intake pressure of the engine is obviously increased after being pressurized by the pressure booster wheel 9, so that the intake pressure after being pressurized under partial working conditions is greater than the exhaust pressure before the pressure booster turbine 8), the exhaust gas can stably flow from the EGR exhaust pipe 7 to the EGR intake pipe 6 due to the pressure difference, and the required EGR rate can be achieved only through the opening degree of the EGR valve.
When the pressure difference between the exhaust pressure 3 of the EGR exhaust pipeline 7 and the EGR air inlet pipeline 6 is not much or even lower than the pressure of the EGR air inlet pipeline 6, the pressure difference is not enough to stably push the exhaust gas into the EGR air inlet pipeline 6, at this time, the engine ECU11 calculates and obtains the currently required supercharging requirement 1 through the engine ECU11 according to the data such as the exhaust pressure 3, the data discharged by the post-vortex nitrogen-oxygen sensor 10, the engine speed power 5, the data collected in real time, the post-intercooling intake temperature and pressure 4 and the like, and transmits a target supercharging signal to the EGR active supercharging device 2, the EGR active supercharging device 2 completes supercharging of the exhaust gas, and the pressure gradient from the exhaust side to the air inlet side is ensured, so that the EGR rate under any working condition of the engine can be adjusted and controlled.
The EGR active supercharging device is designed, the flow of waste gas from the exhaust manifold to the intake manifold is not required to be met by increasing exhaust back pressure, the exhaust system can be designed to be smoother, the exhaust resistance is reduced, and the pumping loss of an engine is reduced.
The utility model has simple structure and lower cost, optimizes the control strategy, compresses the waste gas to a certain pressure through the diesel engine running information collected by the ECU when the pressure before the vortex is not enough to drive the waste gas to flow into the intercooling rear pipeline from the exhaust manifold, and then enters the intercooling rear pipeline. And proper amount of EGR is controlled in time, so that NOX emission is controlled better, and the optimal engine emission and power performance indexes are realized.
The above-described embodiments of the utility model are intended to be illustrative only and are not intended to be limiting, as all changes that come within the scope of or equivalence to the utility model are intended to be embraced therein.
Claims (2)
1. An active supercharged EGR system, including EGR air intake pipe (6), EGR exhaust pipe (7), nitrogen oxygen sensor (10), temperature sensor, ECU (11) and EGR cooler (12), its characterized in that: an EGR active supercharging device (2) is arranged between the EGR air inlet pipeline (6) and the EGR exhaust pipeline (7), and the EGR active supercharging device (2) is arranged at the hot end of the EGR cooler (12) or the cold end of the EGR cooler (12); when the pressure of an EGR exhaust pipeline (7) is not enough to push exhaust gas into an EGR air inlet pipeline (6), the EGR active supercharging device (2) boosts the exhaust gas to ensure the stability of the pressure difference on two sides of an EGR cooler (12).
2. The active charge EGR system of claim 1 wherein: the ECU (11) calculates the required supercharging requirement (1) according to the emission data measured by the temperature sensor and the nitrogen-oxygen sensor (10), and transmits a target supercharging signal to the EGR active supercharging device (2), and the EGR active supercharging device (2) completes supercharging of waste gas, so that the EGR rate of the engine under any working condition can be adjusted and controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120882882.4U CN215370067U (en) | 2021-04-27 | 2021-04-27 | Active supercharging EGR system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120882882.4U CN215370067U (en) | 2021-04-27 | 2021-04-27 | Active supercharging EGR system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215370067U true CN215370067U (en) | 2021-12-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120882882.4U Active CN215370067U (en) | 2021-04-27 | 2021-04-27 | Active supercharging EGR system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215370067U (en) |
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2021
- 2021-04-27 CN CN202120882882.4U patent/CN215370067U/en active Active
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221219 Address after: 311232 No. 699, Hongtai Sixth Road, hongken farm, Xiaoshan Economic and Technological Development Zone, Xiaoshan District, Hangzhou City, Zhejiang Province Patentee after: CHINA NATIONAL HEAVY DUTY TRUCK GROUP HANGZHOU ENGINE Co.,Ltd. Address before: Shengjing tangwangshan Road North Panwang Road West, Zhangqiu District, Jinan City, Shandong Province 250200 Patentee before: China National Heavy Duty Truck Group Jinan Power Co.,Ltd. |
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| TR01 | Transfer of patent right |