CN218760143U - Internal combustion engine exhaust gas circulation rate measuring system - Google Patents
Internal combustion engine exhaust gas circulation rate measuring system Download PDFInfo
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- CN218760143U CN218760143U CN202222941624.6U CN202222941624U CN218760143U CN 218760143 U CN218760143 U CN 218760143U CN 202222941624 U CN202222941624 U CN 202222941624U CN 218760143 U CN218760143 U CN 218760143U
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Abstract
The utility model provides an internal-combustion engine exhaust gas circulation rate measurement system relates to internal-combustion engine exhaust gas circulation technical field, include: the air inlet of the internal combustion engine is connected with one end of the mixed air inlet pipe, and the air outlet of the internal combustion engine is connected with the air inlet of the waste gas turbine; one end of the air inlet pipe is connected with an air inlet of the supercharger, an air outlet of the supercharger is connected with the other end of the mixed air inlet pipe, and the air inlet pipe is provided with a first air inlet pipe side wall port connected with an air outlet of the waste gas recirculation system; the linear oxygen sensor at the air inlet side is arranged at one end of the mixed air inlet pipe, which is close to the supercharger; the air inlet valve body is arranged at one end of the mixed air inlet pipe close to the internal combustion engine; one end of the waste gas exhaust pipe is connected with a gas outlet of the waste gas turbine, and a side wall port of the first exhaust pipe is arranged on the waste gas exhaust pipe and is connected with a gas inlet of the waste gas recirculation system; the electronic control unit is respectively connected with the air inlet side linear oxygen sensor and the waste gas recirculation system. The method has the advantages that the exhaust gas recirculation rate is accurately measured in real time under the transient working condition of the internal combustion engine, and the risk is reduced.
Description
Technical Field
The utility model relates to an internal-combustion engine exhaust gas circulation technical field especially relates to an internal-combustion engine exhaust gas circulation rate measurement system.
Background
Generally, an air intake of a low-pressure exhaust gas recirculation system (hereinafter referred to as an LPEGR system) commonly adopted in an internal combustion engine at present is arranged behind a three-way catalyst, and compared with a traditional high-pressure exhaust gas recirculation system, the air intake temperature is lower, and exhaust gas is cleaner, so that the overall exhaust gas recirculation rate of the internal combustion engine is improved, and the applicable working conditions of the exhaust gas recirculation system are more, so that the contribution to the overall oil consumption and the emission of the internal combustion engine is higher than that of the traditional high-pressure exhaust gas recirculation system.
The conventional LPEGR system mainly estimates the exhaust gas recirculation rate by the EGR upstream and downstream pressure difference sensors and the intake flow meter, wherein the exhaust gas recirculation upstream and downstream pressure difference sensors are responsible for estimating the exhaust gas recirculation flow, and the intake flow meter is responsible for estimating the fresh air flow and finally calculating the exhaust gas recirculation rate of the gas entering a cylinder for combustion.
The lp egr system of this solution has one of the biggest drawbacks, namely: when the internal combustion engine is in a transient working condition, namely when the internal combustion engine is rapidly transited from one working condition to the next working condition, because the exhaust gas recirculation differential pressure sensor is far away from the air inlet end, the exhaust gas recirculation rate of gas entering a cylinder for combustion cannot be estimated in real time, and therefore the internal combustion engine has potential risks of poor combustion or knocking and the like.
SUMMERY OF THE UTILITY MODEL
To the problem that exists among the prior art, the utility model provides an internal-combustion engine exhaust gas circulation rate measurement system, include:
the air inlet of the internal combustion engine is connected with one end of a mixed air inlet pipe, and the air outlet of the internal combustion engine is connected with the air inlet of an exhaust gas turbine;
the air inlet pipe is provided with a side wall port of a first air inlet pipe on the side wall close to one end of the supercharger and connected with an air outlet of the exhaust gas recirculation system;
the linear oxygen sensor at the air inlet side is arranged at one end, close to the supercharger, of the mixed air inlet pipe;
the air inlet valve body is arranged at one end of the mixed air inlet pipe close to the internal combustion engine;
one end of the waste gas exhaust pipe is connected with the gas outlet of the waste gas turbine, and the side wall of the other end of the waste gas exhaust pipe is provided with a first exhaust pipe side wall port connected with the gas inlet of the waste gas recirculation system;
and the electronic control unit is respectively connected with the air inlet side linear oxygen sensor and the exhaust gas recirculation system.
Preferably, the exhaust gas recirculation system includes:
one end of the waste gas circulating pipe is connected with the side wall port of the first air inlet pipe, and the other end of the waste gas circulating pipe is connected with the side wall port of the first exhaust pipe;
the filter is arranged at one end of the exhaust gas circulating pipe close to the side wall opening connected with the first exhaust pipe;
the low-pressure valve is arranged at one end of the waste gas circulating pipe, which is close to the side wall opening connected with the first air inlet pipe;
a cooler provided between the low pressure valve on the exhaust gas circulation pipe and the filter;
and the temperature sensor is arranged on one side, close to the cooler, of the low-pressure valve on the exhaust gas circulating pipe.
Preferably, a mixing valve is further arranged at one end, far away from the supercharger, of the first air inlet pipe side wall port, and the mixing valve is connected with the electronic control unit.
Preferably, an opening and closing type oxygen sensor is arranged at the position of the side wall opening of the first exhaust pipe, two sides of the opening and closing type oxygen sensor are respectively provided with a three-way catalytic converter, and the opening and closing type oxygen sensor is connected with the electronic control unit.
Preferably, a first intake temperature and pressure sensor is further arranged on one side, close to the linear oxygen sensor on the intake side, of the intake valve body on the mixed intake pipe; an intake flow sensor is further arranged at one end of the air inlet pipe, which is far away from the supercharger;
the electronic control unit is respectively connected with the first air inlet temperature and pressure sensor, the second air inlet temperature and pressure sensor and the air inlet flow sensor.
Preferably, a water-cooled intercooler is further arranged at the air inlet of the internal combustion engine; and a second air inlet temperature and pressure sensor is arranged at an air inlet of the internal combustion engine and is connected with the electronic control unit.
Preferably, the exhaust gas recirculation system further comprises a waste gate valve, one end of the waste gate valve is connected with the gas outlet of the internal combustion engine, and the other end of the waste gate valve is connected with a second exhaust pipe side wall port formed in the side wall of one end, close to the exhaust turbine, of the exhaust gas exhaust pipe.
Preferably, the air intake pipe is provided with a first air intake pipe side wall opening, the first air intake pipe side wall opening is provided with a first air intake pipe, the second air intake pipe side wall opening is provided with a second air intake pipe side wall opening, and the first air intake pipe side wall opening is provided with a second air intake pipe.
The technical scheme has the following advantages or beneficial effects: the linear oxygen sensor at the air inlet side is additionally arranged on the mixed air inlet pipe and is closer to the air inlet of the internal combustion engine, so that the exhaust gas recirculation rate is measured more accurately and in real time under the transient working condition of the internal combustion engine, the integral oil consumption and the emission level of the internal combustion engine are optimized, and the risks of poor combustion, knocking and the like caused by the fact that the exhaust gas recirculation rate is measured mistakenly under the transient working condition of the internal combustion engine are reduced.
Drawings
Fig. 1 is a schematic structural diagram of an exhaust gas circulation rate measuring system of an internal combustion engine according to a preferred embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The present invention is not limited to this embodiment, and other embodiments may also belong to the scope of the present invention as long as the gist of the present invention is satisfied.
In a preferred embodiment of the present invention, based on the above problems existing in the prior art, there is provided an exhaust gas circulation rate measuring system for an internal combustion engine, as shown in fig. 1, including:
the system comprises an internal combustion engine 1, wherein an air inlet of the internal combustion engine 1 is connected with one end of a mixed air inlet pipe 2, and an air outlet of the internal combustion engine 1 is connected with an air inlet of an exhaust gas turbine 3;
one end of the air inlet pipe 4 is connected with an air inlet of the supercharger 5, an air outlet of the supercharger 5 is connected with the other end of the mixed air inlet pipe 2, and a side wall opening of a first air inlet pipe is formed in the side wall of the air inlet pipe 4 close to one end of the supercharger 5 and connected with an air outlet of the exhaust gas recirculation system 6;
the air inlet side linear oxygen sensor 7 is arranged at one end, close to the supercharger 5, of the mixed air inlet pipe 2;
the air inlet valve body 8 is arranged at one end of the mixed air inlet pipe 2 close to the internal combustion engine 1;
one end of the waste gas exhaust pipe 9 is connected with the gas outlet of the waste gas turbine 3, and the side wall of the other end of the waste gas exhaust pipe 9 is provided with a first exhaust pipe side wall port connected with the gas inlet of the waste gas recirculation system 6;
and the electronic control unit is respectively connected with the air inlet side linear oxygen sensor 7 and the exhaust gas recirculation system 6.
Specifically, in this embodiment, an intake-side linear oxygen sensor 7 is additionally arranged on a mixed intake pipe 2 of the internal combustion engine 1, fresh air entering from an air intake pipe 4 and exhaust gas discharged from an exhaust gas recirculation system 6 are mixed into mixed gas in the mixed intake pipe 2, intake oxygen content data of the mixed gas in the mixed intake pipe 2 detected by the intake-side linear oxygen sensor 7 is acquired in real time through an electronic control unit, and a real-time exhaust gas recirculation rate of the whole internal combustion engine 1 system is calculated by combining standard oxygen content data in the air.
In a preferred embodiment of the present invention, the exhaust gas recirculation system 6 includes:
one end of the waste gas circulating pipe 61 is connected with a first air inlet pipe side wall port, and the other end of the waste gas circulating pipe 61 is connected with a first exhaust pipe side wall port;
a filter 62, the filter 62 being provided at one end of the exhaust circulation pipe 61 near the side wall port of the first exhaust pipe;
a low pressure valve 63, the low pressure valve 63 being provided at one end of the exhaust circulation pipe 61 near the side wall port of the first intake pipe;
a cooler 64, the cooler 64 being provided between the low pressure valve 63 on the exhaust gas circulation pipe 61 and the filter 62;
and a temperature sensor 65, wherein the temperature sensor 65 is arranged on the exhaust gas circulating pipe 61 on the side of the low-pressure valve 63 close to the cooler 64.
Specifically, in this embodiment, a filter 62, a cooler 64 and a temperature sensor 65 are further arranged in the exhaust gas recirculation system, so that the exhaust gas recirculation system 6 filters and cools the exhaust gas discharged from the exhaust gas exhaust pipe 9 to improve the recycling rate of the recirculated exhaust gas, and the temperature sensor is used for detecting the real-time temperature in the exhaust gas recirculation system 6, thereby avoiding accidents due to overhigh temperature.
In a preferred embodiment of the present invention, a mixing valve 10 is further disposed at an end of the first air inlet pipe side wall port far away from the supercharger 5, and the mixing valve 10 is connected to the electronic control unit.
Specifically, in this embodiment, the air intake pipe 4 is further provided with a mixing valve 10, and the mixing ratio of the fresh intake air and the exhaust gas output by the exhaust gas recirculation system 6 is adjusted by adjusting the opening degree of the valve of the mixing valve 10.
The utility model discloses an in the preferred embodiment, first exhaust pipe lateral wall mouth department is equipped with on-off oxygen sensor 11, and on-off oxygen sensor 11's both sides are equipped with a three way catalyst converter 12 respectively, and on-off oxygen sensor 11 connects the electronic control unit.
Specifically, in this embodiment, first exhaust pipe lateral wall mouth department is equipped with on-off oxygen sensor 11, and on-off oxygen sensor 11's both sides are equipped with a three way catalyst converter 12 respectively, purify the harmful gas in the waste gas through three way catalyst converter 12, reduce exhaust pollution, and on-off oxygen sensor 11 carries out oxygen content to the waste gas after purifying and detects and be convenient for judge purifying effect.
In the preferred embodiment of the present invention, a first inlet temperature and pressure sensor 13 is further disposed on the side of the inlet valve body 8 of the mixed inlet pipe 2, which is close to the inlet side linear oxygen sensor; an intake flow sensor 14 is also arranged at one end of the air inlet pipe, which is far away from the supercharger;
the electronic control unit is connected with a first intake air temperature and pressure sensor 13 and an intake air flow sensor 14, respectively.
Specifically, in this embodiment, a first intake temperature and pressure sensor 13 is disposed on the mixed intake pipe 2, an intake flow sensor 14 is disposed on the air intake pipe 4, and as an alternative detection scheme when the linear oxygen sensor 7 on the intake side fails, the total intake air amount of the system is detected by the first intake temperature and pressure sensor 13, the intake flow data of the air intake pipe 4 is detected by the intake flow sensor 14, and an alternative actual exhaust gas recirculation rate is obtained according to the intake flow data and the total intake air amount of the system.
The utility model discloses an in the preferred embodiment, the air inlet department of internal-combustion engine 1 still is equipped with water-cooling intercooler 15, and the air inlet department of internal-combustion engine 1 is equipped with second intake air temperature pressure sensor 16, and the electronic control unit is connected to second intake air temperature pressure sensor 16 ware.
Specifically, in the present embodiment, a water-cooled intercooler 15 and a second intake air temperature and pressure sensor 16 are respectively disposed at the intake port of the internal combustion engine 1 to further cool the mixed gas, and detect the temperature of the cooled mixed gas, so as to prevent the internal combustion engine 1 from being damaged due to an excessively high temperature of the mixed gas.
The utility model discloses an in the preferred embodiment, still include the waste gate valve 17, the gas outlet of internal-combustion engine is connected to waste gate valve 17 one end, and the second blast pipe lateral wall mouth of seting up on the lateral wall of the one end that is close to exhaust-gas turbine 3 on the exhaust-gas ducting 9 is connected to the other end of waste gate valve 17.
Specifically, in the present embodiment, the waste gate valve 17 is opened when the air pressure is excessive, thereby preventing the waste gate turbine 3 from being damaged by the excessive air pressure.
The utility model discloses an in the embodiment of preferred, still include pressure boost relief valve 18, the mixing tube side wall mouth of seting up on the lateral wall of mixing intake pipe 2 is connected to the one end of pressure boost relief valve 18, and the second intake pipe side wall mouth of seting up on the lateral wall of the one end that air intake pipe 4 is close to booster 5 is connected to the other end of pressure boost relief valve 18.
Specifically, in the present embodiment, the boost pressure relief valve 18 opens when the air pressure is excessive, thereby preventing the supercharger 5 from being damaged when the air pressure is excessive.
The utility model also provides a method for measuring the exhaust gas circulation rate of internal-combustion engine is applied to foretell internal-combustion engine exhaust gas circulation rate measurement system, and the exhaust gas recirculation system among the internal-combustion engine exhaust gas circulation rate measurement system includes: one end of the waste gas circulating pipe is connected with a side wall port of the first air inlet pipe, and the other end of the waste gas circulating pipe is connected with a side wall port of the first exhaust pipe; the low-pressure valve is arranged at one end of the waste gas circulating pipe, which is close to the side wall opening connected with the first air inlet pipe; then, the internal combustion engine exhaust gas circulation rate measuring method includes:
s1, acquiring air inlet oxygen content data of an air inlet side linear oxygen sensor by an electronic control unit;
s2, calculating an actual exhaust gas recirculation rate by the electronic control unit according to the intake air oxygen content data and preset air standard oxygen content data;
and S3, performing proportional integral derivative control on the opening of a low-pressure valve of the exhaust gas recirculation system by the electronic control unit according to the actual exhaust gas recirculation rate and a preset target exhaust gas recirculation rate, so that the actual exhaust gas recirculation rate is not less than the target exhaust gas recirculation rate.
Specifically, in this embodiment, the electronic control unit obtains intake air oxygen content data of the intake side linear oxygen sensor, and calculates an actual exhaust gas recirculation rate according to the intake air oxygen content data and preset air standard oxygen content data, where the calculation formula is as follows:
REGRLP＝1-INTAKE_O2PERCENT/AIRO2_REF
wherein: REGRLP is the actual exhaust gas recirculation rate; INTAKE _ O2PERCENT is the INTAKE oxygen content; AIRO2_ REF is the standard oxygen content in air.
The electronic control unit performs proportional integral derivative control on the opening of a low-pressure valve of the exhaust gas recirculation system according to the actual exhaust gas recirculation rate and a preset target exhaust gas recirculation rate, so that the actual exhaust gas recirculation rate is not less than the target exhaust gas recirculation rate, and the exhaust gas recirculation rate of the internal combustion engine is improved.
The utility model discloses an in the embodiment of preferred, the one side that the last air intake valve body of mixed intake pipe is close to the linear oxygen sensor of air inlet side still is equipped with first intake temperature pressure sensor, and the one end of keeping away from the booster in the air intake pipe still is equipped with air intake flow sensor, then still includes before carrying out step S1:
step A1, the electronic control unit detects whether the linear oxygen sensor at the air inlet side has a fault:
if not, turning to the step S1;
if yes, turning to the step A2;
step A2, the electronic control unit respectively collects air inlet flow data of an air inlet flow sensor and air inlet total amount data of the internal combustion engine of a first air inlet temperature and pressure sensor;
step A3, calculating by an electronic control unit according to the air inflow data and the total air inflow amount of the internal combustion engine to obtain an alternative actual exhaust gas recirculation rate;
and step A4, the electronic control unit performs proportional integral derivative control on the opening of the low-pressure valve according to the alternative actual exhaust gas recirculation rate and a preset target exhaust gas recirculation rate, so that the alternative actual exhaust gas recirculation rate is not less than the target exhaust gas recirculation rate.
Specifically, in this embodiment, when a fault of the intake-side linear oxygen sensor is detected, the electronic control unit obtains intake air flow data of the intake air flow sensor and engine intake total amount data of the first intake air temperature and pressure sensor, and calculates the alternative actual exhaust gas recirculation rate according to the intake air flow data and the engine intake total amount, where the calculation formula is as follows:
ALTERNATIVEEGR＝1-AIRINTAKE/TOTALINTAKE；
wherein ALTERNATIVEEGR is the alternative actual exhaust gas recirculation rate, AIRINTAKE is the air intake flow data, and TOTALINTAKE is the air intake total amount data of the internal combustion engine;
compared with the actual exhaust gas recirculation rate calculated according to the intake oxygen content measured by the intake side linear oxygen sensor, the actual exhaust gas recirculation rate is more accurate than the alternative actual exhaust gas recirculation rate, and the intake flow sensor and the first intake temperature and pressure sensor are used as alternative measurement schemes when the intake side linear oxygen sensor fails.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and it should be understood that all modifications and obvious variations of the present invention as described and illustrated herein are included within the scope of the present invention.
Claims (8)
1. An exhaust gas circulation rate measuring system for an internal combustion engine, comprising:
the air inlet of the internal combustion engine is connected with one end of a mixed air inlet pipe, and the air outlet of the internal combustion engine is connected with the air inlet of an exhaust gas turbine;
the air inlet pipe is provided with a side wall port of a first air inlet pipe on the side wall close to one end of the supercharger and connected with an air outlet of the exhaust gas recirculation system;
the linear oxygen sensor at the air inlet side is arranged at one end, close to the supercharger, of the mixed air inlet pipe;
the air inlet valve body is arranged at one end of the mixed air inlet pipe close to the internal combustion engine;
one end of the waste gas exhaust pipe is connected with the gas outlet of the waste gas turbine, and the side wall of the other end of the waste gas exhaust pipe is provided with a first exhaust pipe side wall port connected with the gas inlet of the waste gas recirculation system;
and the electronic control unit is respectively connected with the air inlet side linear oxygen sensor and the exhaust gas recirculation system.
2. The internal combustion engine exhaust gas recirculation rate measurement system according to claim 1, wherein the exhaust gas recirculation system includes:
one end of the waste gas circulating pipe is connected with the side wall port of the first air inlet pipe, and the other end of the waste gas circulating pipe is connected with the side wall port of the first exhaust pipe;
the filter is arranged at one end of the exhaust gas circulating pipe close to the side wall opening connected with the first exhaust pipe;
the low-pressure valve is arranged at one end of the waste gas circulating pipe, which is close to the side wall opening connected with the first air inlet pipe;
a cooler provided between the low pressure valve on the exhaust gas circulation pipe and the filter;
and the temperature sensor is arranged on one side, close to the cooler, of the low-pressure valve on the exhaust gas circulating pipe.
3. The system of claim 1, wherein the end of the first intake pipe sidewall port remote from the supercharger is further provided with a mixing valve, and the mixing valve is connected to the electronic control unit.
4. The system for measuring the exhaust gas circulation rate of an internal combustion engine according to claim 1, wherein an on-off oxygen sensor is provided at a side wall port of the first exhaust pipe, a three-way catalyst is provided on each side of the on-off oxygen sensor, and the on-off oxygen sensor is connected to the electronic control unit.
5. The internal combustion engine exhaust gas circulation rate measuring system according to claim 1, wherein a first intake air temperature pressure sensor is further provided on the mixture intake pipe on a side of the intake valve body close to the intake side linear oxygen sensor; an intake flow sensor is further arranged at one end of the air inlet pipe, which is far away from the supercharger;
the electronic control unit is connected with the first intake air temperature and pressure sensor and the intake air flow sensor respectively.
6. The internal combustion engine exhaust gas circulation rate measuring system according to claim 1, wherein a water-cooled intercooler is further provided at an air inlet of the internal combustion engine; and a second air inlet temperature and pressure sensor is arranged at an air inlet of the internal combustion engine and is connected with the electronic control unit.
7. The system according to claim 1, further comprising a wastegate valve, one end of the wastegate valve being connected to an air outlet of the internal combustion engine, and the other end of the wastegate valve being connected to a second exhaust pipe side wall port provided in a side wall of the exhaust pipe at an end close to the exhaust turbine.
8. The internal combustion engine exhaust gas circulation rate measuring system according to claim 1, further comprising a pressure-increasing relief valve, one end of the pressure-increasing relief valve is connected to a mixing pipe side wall port formed in the side wall of the mixing intake pipe, and the other end of the pressure-increasing relief valve is connected to a second intake pipe side wall port formed in the side wall of the air intake pipe near the supercharger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222941624.6U CN218760143U (en) | 2022-11-04 | 2022-11-04 | Internal combustion engine exhaust gas circulation rate measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222941624.6U CN218760143U (en) | 2022-11-04 | 2022-11-04 | Internal combustion engine exhaust gas circulation rate measuring system |
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| Publication Number | Publication Date |
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| CN218760143U true CN218760143U (en) | 2023-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222941624.6U Active CN218760143U (en) | 2022-11-04 | 2022-11-04 | Internal combustion engine exhaust gas circulation rate measuring system |
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| CN (1) | CN218760143U (en) |
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2022
- 2022-11-04 CN CN202222941624.6U patent/CN218760143U/en active Active
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