CN110878729B - Method and system for self-cleaning waste gas venturi tube for engine - Google Patents
Method and system for self-cleaning waste gas venturi tube for engine Download PDFInfo
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- CN110878729B CN110878729B CN201911258114.5A CN201911258114A CN110878729B CN 110878729 B CN110878729 B CN 110878729B CN 201911258114 A CN201911258114 A CN 201911258114A CN 110878729 B CN110878729 B CN 110878729B
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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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/50—Arrangements or methods for preventing or reducing deposits, corrosion or wear caused by impurities
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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
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/09—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine
- F02M26/10—Constructional details, e.g. structural combinations of EGR systems and supercharger systems; Arrangement of the EGR and supercharger systems with respect to the engine having means to increase the pressure difference between the exhaust and intake system, e.g. venturis, variable geometry turbines, check valves using pressure pulsations or throttles in the air intake or exhaust system
Abstract
The invention discloses a method and a system for self-cleaning a waste gas venturi tube for an engine, which relate to the field of engines, and firstly judge whether a self-cleaning condition is satisfied before self-cleaning; if yes, generating a corresponding control signal; starting self-cleaning timing according to a control signal, controlling the opening of an EGR valve to be larger than 0, controlling a supercharger to adjust a driving pressure difference delta P to be a self-cleaning driving pressure difference delta P, and controlling the self-cleaning driving pressure difference delta P to be negative, so that fresh air flowing through a compressor reversely flows through an EGR pipeline under the action of the pressure difference, and back-blowing cleaning is carried out on a Venturi tube; when the timing time reaches a preset time T1, the switching supercharger and the EGR valve operate normally. Therefore, the variable-section supercharger adjusts the driving pressure difference delta P, so that fresh air is blown back to self-clean the Venturi tube, the cleanliness of the throat of the Venturi tube is ensured, and the measurement precision of the exhaust gas flow is ensured; and the whole self-cleaning process does not need to use an external air source, so that the normal operation of the engine is ensured.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a method and a system for automatically cleaning a waste gas venturi tube for an engine.
Background
The EGR/VNT technology is still one of the key technologies for satisfying Europe-six emission, in order to control the emission of the engine, the exhaust gas flow must be accurately measured, therefore the Venturi technology is widely applied, the Venturi tube is installed on the recirculation pipeline of the engine, the exhaust gas flow which flows through is calculated by measuring the pressure difference between the inlet and the throat of the Venturi tube through a sensor, as shown in figure 1, an EGR cooler, an EGR valve 5 and the Venturi tube 3 for measuring the exhaust gas flow are sequentially arranged on the EGR pipeline, the diameter of the throat of the Venturi tube 3 is directly related to the measurement accuracy of the exhaust gas flow, the accuracy of the diameter of the throat must be ensured, but after long-time use, the Venturi tube 3 is installed on the exhaust gas pipeline, carbon deposition can be caused, the measurement accuracy of the exhaust gas flow is inevitably.
Disclosure of Invention
Aiming at the defects, the technical problems to be solved by the invention are as follows: the method and the system for automatically cleaning the exhaust gas venturi tube for the engine ensure the cleanliness of the throat of the venturi tube and the measurement precision of the exhaust gas flow in a fresh air back flushing and self cleaning mode.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a method of self-cleaning an exhaust venturi for an engine, comprising the steps of:
step one, judging whether a self-cleaning condition is established;
step two, if the result is true, generating a corresponding control signal;
starting self-cleaning timing according to the control signal, controlling the opening of the EGR valve to be larger than 0, controlling the supercharger to adjust the driving pressure difference delta P to be the self-cleaning driving pressure difference delta P, and controlling the self-cleaning driving pressure difference delta P to be negative, so that the fresh air flowing through the compressor reversely flows through the EGR pipeline under the action of the pressure difference, and the Venturi tube is subjected to back flushing cleaning;
and step four, when the timing time reaches preset time T1, switching the supercharger and the EGR valve to normally operate.
Preferably, the third step further includes the steps of:
acquiring the rotating speed and the fuel injection quantity of an engine;
searching a map table of the self-cleaning driving pressure difference delta P according to the rotating speed and the fuel injection quantity of the engine, and acquiring a preset self-cleaning driving pressure difference delta P;
and controlling the real-time self-cleaning driving pressure difference delta P of the supercharger to perform PID closed-loop regulation by taking the preset self-cleaning driving pressure difference delta P as a target.
Preferably, the third step further includes the steps of:
acquiring the rotating speed and the fuel injection quantity of an engine;
searching a map table of the opening of the EGR valve according to the rotating speed and the fuel injection quantity of the engine to obtain a preset opening;
and controlling the EGR valve to operate at a preset opening degree.
Preferably, the first step specifically includes the following steps:
acquiring fuel injection quantity, engine rotating speed, air inlet temperature, mileage, air inlet temperature, engine temperature and exhaust temperature;
judging whether the fuel injection quantity is within a preset range;
judging whether the rotating speed of the engine is within a preset range;
judging whether the mileage is larger than a preset self-cleaning mileage or not;
judging whether the air inlet temperature is within a preset range;
judging whether the temperature of the engine is within a preset range or not;
judging whether the exhaust temperature is within a preset range;
if the oil injection quantity and the engine rotating speed are in a preset range, the mileage is larger than a preset cleaning mileage, the air inlet temperature, the engine temperature and the exhaust temperature are in a preset range, and the self-cleaning condition is met;
and then, the fourth step further comprises mileage zero clearing.
A system for automatically cleaning an exhaust gas venturi tube for an engine comprises an electric control unit, and further comprises an automatic cleaning monitoring unit, a variable cross-section supercharger, an EGR valve and a timing unit which are respectively and electrically connected with the electric control unit; the self-cleaning monitoring unit is used for judging whether a self-cleaning condition is satisfied; the variable cross-section supercharger enables fresh air flowing through the compressor to reversely flow through the EGR pipeline under the action of differential pressure by adjusting the driving differential pressure delta P to be negative, and the Venturi tube is subjected to back flushing cleaning; the EGR valve is used for keeping the opening degree not zero when the self-cleaning condition is met; the timing unit is used for timing self-cleaning time; the self-cleaning monitoring unit transmits an electric signal corresponding to whether the self-cleaning condition is met or not to the electric control unit, and the electric control unit controls the variable-section supercharger, the EGR valve and the timing unit according to the electric signal.
Preferably, the self-cleaning monitoring unit comprises an oil injection amount monitoring unit, an engine rotating speed monitoring unit, a mileage monitoring unit, an air inlet temperature monitoring unit, an engine temperature monitoring unit and an exhaust temperature monitoring unit which are respectively and electrically connected with the electric control unit.
The optimal mode is that the device also comprises a preset unit electrically connected with the electric control unit, and the preset unit stores a preset range of fuel injection quantity, a preset range of engine rotating speed, a preset range of air inlet temperature, a preset range of engine temperature, a preset range of exhaust temperature and a preset self-cleaning driving pressure difference delta P into the electric control unit.
The air conditioner further comprises a first pressure sensor, a second pressure sensor and a PID controller which are respectively electrically connected with the electric control unit, wherein the first pressure sensor is arranged at the air outlet, and the second pressure sensor is provided with an air inlet; and the electronic control unit controls a PID controller to adjust the opening of the variable-section supercharger according to the first pressure sensor and the second pressure sensor.
After the technical scheme is adopted, the invention has the beneficial effects that:
according to the self-cleaning method and the self-cleaning system of the waste gas venturi tube for the engine, whether a self-cleaning condition is met or not is judged before self-cleaning; if yes, generating a corresponding control signal; starting self-cleaning timing according to a control signal, controlling the opening of an EGR valve to be larger than 0, controlling a supercharger to adjust a driving pressure difference delta P to be a self-cleaning driving pressure difference delta P, and controlling the self-cleaning driving pressure difference delta P to be negative, so that fresh air flowing through a compressor reversely flows through an EGR pipeline under the action of the pressure difference, and back-blowing cleaning is carried out on a Venturi tube; when the timing time reaches a preset time T1, the switching supercharger and the EGR valve operate normally. Therefore, the variable-section supercharger adjusts the driving pressure difference delta P, so that fresh air is blown back to self-clean the Venturi tube, the cleanliness of the throat of the Venturi tube is ensured, and the measurement precision of the waste gas flow is further ensured; and the whole self-cleaning process does not need to use an external air source, and the normal operation of the engine is not influenced.
Due to the third step, the method also comprises the following steps: acquiring the rotating speed and the fuel injection quantity of an engine; searching a map table of the self-cleaning driving pressure difference delta P according to the rotating speed and the fuel injection quantity of the engine, and acquiring a preset self-cleaning driving pressure difference delta P; controlling a real-time self-cleaning driving pressure difference delta P of the supercharger to perform PID closed-loop regulation by taking a preset self-cleaning driving pressure difference delta P as a target; this step ensures that fresh air is blown back to clean the venturi during the self-cleaning time.
Drawings
FIG. 1 is a schematic structural view of a system for self-cleaning of an exhaust gas venturi for an engine according to the present invention;
FIG. 2 is a schematic diagram of PID closed loop control during self-cleaning of the supercharger;
FIG. 3 is a schematic of open loop control during EGR valve self-cleaning;
FIG. 4 is a flow chart of a method of the present invention for self-cleaning an exhaust gas venturi for an engine;
FIG. 5 is a logic diagram of a self-cleaning condition in the present invention;
FIG. 6 is a functional block diagram of a system for self-cleaning of an exhaust gas venturi for an engine according to the present invention;
in the figure: 1-first pressure sensor, 2-second pressure sensor, 3-venturi tube, 4-supercharger, 5-EGR valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown collectively in fig. 1 to 5, a method of self-cleaning an exhaust gas venturi for an engine, comprising the steps of:
step one, judging whether a self-cleaning condition is established;
step two, if the result is true, generating a corresponding control signal;
starting self-cleaning timing according to the control signal, controlling the opening degree of the EGR valve 5 to be larger than 0, controlling the supercharger 4 to adjust the driving pressure difference delta P to be the self-cleaning driving pressure difference delta P, and controlling the self-cleaning driving pressure difference delta P to be negative, so that the fresh air flowing through the compressor reversely flows through the EGR pipeline under the action of the pressure difference, and the Venturi tube 3 is subjected to back flushing cleaning;
and step four, when the timing time reaches preset time T1, switching the supercharger 4 and the EGR valve 5 to normally operate, namely, adjusting the driving pressure difference delta P of the supercharger 4 to be larger than zero, so that the exhaust gas enters the engine from the air inlet.
The method of the invention does not need to use an external air source and does not influence the normal operation of the engine. When the self-cleaning condition is met, the opening degree of the supercharger 4 is controlled to adjust the driving pressure difference delta P, so that the pressure at the second pressure sensor 2 in the figure 1 is larger than the pressure of the first pressure sensor 1, fresh air flowing through the air compressor is blown into the Venturi tube 3, the Venturi tube 3 is self-cleaned in the direction shown by a dotted arrow in the figure 1, and the solid line in the figure 1 is the normal gas flowing direction. In order to ensure the normal operation of the engine, the self-cleaning time is preset to T1, T1 is not limited to 60 seconds, and after the time is up, the supercharger 4 and the EGR valve 5 are controlled to switch to the normal operation mode. Therefore, the method of the invention can complete the self-cleaning of the Venturi tube 3 and the carbon deposition cleaning under certain conditions, so that the Venturi tube can work normally, and the waste gas amount can be measured accurately.
As shown in fig. 2, step three further includes the following steps:
acquiring the rotating speed and the fuel injection quantity of an engine;
searching a map table of the self-cleaning driving pressure difference delta P according to the rotating speed and the fuel injection quantity of the engine, and acquiring a preset self-cleaning driving pressure difference delta P;
and controlling the real-time self-cleaning driving pressure difference delta P of the VNT of the supercharger to perform PID closed-loop regulation by taking the preset self-cleaning driving pressure difference delta P as a target.
The method comprises the steps that a real-time self-cleaning driving pressure difference delta P of a supercharger VNT is obtained through a sensor, a self-cleaning driving pressure difference delta P is obtained through the engine rotating speed and fuel injection quantity checking map, the self-cleaning driving pressure difference delta P and the self-cleaning driving pressure difference delta P are controlled by a PID controller, the opening degree of the supercharger VNT is adjusted, the driving pressure difference delta P is negative during self-cleaning, after an engine runs to the region, fresh air is blown back into a Venturi tube, self-cleaning is achieved, the driving pressure difference delta P is kept negative through closed-loop control, self-cleaning is reliably conducted.
As shown in fig. 3, step three further includes the following steps:
acquiring the rotating speed and the fuel injection quantity of an engine;
searching a map table of the opening of the EGR valve according to the rotating speed and the fuel injection quantity of the engine to obtain a preset opening;
the EGR valve is controlled to operate at a preset opening degree.
When self-cleaning is carried out, the EGR valve is controlled in an open loop mode, the map table is checked to obtain the preset opening according to the rotating speed and the fuel injection quantity of the engine, the EGR valve is controlled according to the opening, fresh air is made to circulate in the cleaning time, and the venturi tube self-cleaning is achieved.
As shown in fig. 5, the self-cleaning condition in the first step specifically includes the following steps:
acquiring fuel injection quantity, engine rotating speed, air inlet temperature, mileage, air inlet temperature, engine temperature and exhaust temperature;
judging whether the fuel injection quantity is in a preset range, and if so, setting the fuel injection quantity A1 to be not less than x to be not less than B1 as shown in the graph of FIG. 5, wherein A1 is the minimum value of the preset fuel injection quantity, and B1 is the maximum value of the preset fuel injection quantity; the self-cleaning is started under the condition that the engine is ensured to be in the proper working condition.
Judging whether the engine speed is in a preset range, and as shown in FIG. 5, marking the engine speed A2 to be more than or equal to x to be less than or equal to B2, wherein A2 is the minimum value of the preset engine speed, and B2 is the maximum value of the preset engine speed; the self-cleaning is started under the condition that the engine is ensured to be in the proper working condition.
Judging whether the mileage is larger than a preset self-cleaning mileage or not, and marking the running mileage of the whole vehicle as shown in FIG. 5; the mileage can be calculated through the rotating speed acquired by the vehicle speed sensor;
judging whether the air inlet temperature is within a preset range; as shown in FIG. 5, the standard temperature A3 ≦ x ≦ B3, where A3 is the preset intake air temperature minimum and B3 is the preset intake air temperature maximum; the condition ensures the normal air inlet state, and avoids self-cleaning when the air inlet temperature is lower than 20 ℃, because the self-cleaning effect is poor at the temperature.
Judging whether the temperature of the engine is within a preset range or not; as shown in FIG. 5, x is defined as A4 ≦ X ≦ B4, where A4 is the preset minimum engine temperature and B4 is the preset maximum engine temperature; this condition ensures that the engine temperature is guaranteed to be already in a normal state, e.g. in the range of 80-105 c.
Judging whether the exhaust temperature is within a preset range; as shown in FIG. 5, x is equal to or greater than A5 and equal to or less than B5, wherein A5 is the minimum value of the preset exhaust temperature, and B5 is the maximum value of the preset exhaust temperature; the exhaust of the engine is ensured to be in a normal state through the condition, and self-cleaning is not started if the exhaust temperature is low.
If the oil injection quantity and the engine rotating speed are in a preset range, the mileage is larger than a preset cleaning mileage, the air inlet temperature, the engine temperature and the exhaust temperature are in a preset range, and the self-cleaning condition is met;
and after the self-cleaning is finished, resetting the mileage and accumulating the mileage again so as to start the self-cleaning next time.
In conclusion, the method of the invention controls the opening of the supercharger under the normal working condition of the engine through the constraint of the self-cleaning condition, utilizes the waste gas to back blow into the Venturi tube, realizes the self-cleaning of the Venturi tube, and does not need to utilize an external gas source.
Example two:
as shown in fig. 1 and fig. 6, a system for self-cleaning an exhaust gas venturi for an engine comprises an electronic control unit ECU, a self-cleaning monitoring unit, a variable cross-section supercharger, an EGR valve and a timing unit, wherein the self-cleaning monitoring unit, the variable cross-section supercharger, the EGR valve and the timing unit are respectively electrically connected with the electronic control unit; the self-cleaning monitoring unit is used for judging whether a self-cleaning condition is satisfied; the variable-section supercharger 4 adjusts the driving pressure difference delta P to be negative, so that the fresh air flowing through the compressor reversely flows through the EGR pipeline under the action of the pressure difference, and the Venturi tube is subjected to back flushing cleaning; the EGR valve 5 is used for keeping the opening degree not zero when the self-cleaning condition is met; the timing unit is used for timing self-cleaning time; the self-cleaning monitoring unit transmits an electric signal corresponding to whether the self-cleaning condition is met or not to the electric control unit, and the electric control unit controls the variable-section supercharger 4, the EGR valve 5 and the timing unit according to the electric signal.
As shown in fig. 6, the self-cleaning monitoring unit includes an oil injection amount monitoring unit, an engine rotation speed monitoring unit, a mileage monitoring unit, an intake air temperature monitoring unit, an engine temperature monitoring unit, and an exhaust gas temperature monitoring unit, which are electrically connected to the electronic control unit, respectively.
The fuel injection quantity monitoring unit is used for acquiring fuel injection quantity and judging whether the fuel injection quantity is in a preset range, if so, outputting a self-cleaning corresponding electric signal to the electric control unit, and otherwise, not outputting the self-cleaning corresponding electric signal; the engine rotating speed monitoring unit is used for acquiring the rotating speed of the engine, judging whether the rotating speed of the engine is within a preset range, and if so, outputting a self-cleaning corresponding electric signal to the electric control unit, otherwise, not outputting the self-cleaning corresponding electric signal; the mileage monitoring unit is used for calculating mileage and judging whether the mileage is larger than a preset self-cleaning mileage or not, if so, outputting a self-cleaning corresponding electric signal to the electric control unit, otherwise, not outputting the self-cleaning corresponding electric signal; the air inlet temperature monitoring unit is used for acquiring air inlet temperature, judging whether the air inlet temperature is in a preset range or not, and if the air inlet temperature is in the preset range, outputting a self-cleaning corresponding electric signal to the electric control unit, otherwise, not outputting the self-cleaning corresponding electric signal; the engine temperature monitoring unit is used for acquiring the temperature of the engine, judging whether the temperature of the engine is within a preset range, and if so, outputting a self-cleaning corresponding electric signal to the electric control unit, otherwise, not outputting the self-cleaning corresponding electric signal; the exhaust temperature monitoring unit is used for acquiring exhaust temperature, judging whether the exhaust temperature is within a preset range, and if the exhaust temperature is within the preset range, outputting a self-cleaning corresponding electric signal to the electric control unit, otherwise, not outputting the self-cleaning corresponding electric signal.
The electric control unit starts self-cleaning after receiving the respective cleaning electric signals and all the self-cleaning electric signals, controls the opening of the variable-section supercharger to enable the pressure at the second pressure sensor to be greater than the pressure at the first pressure sensor, enables fresh air flowing through the air compressor to enter the Venturi tube in a back blowing mode, and controls the opening of the EGR valve to be greater than zero to enable the fresh air to circulate to finish self-cleaning of the Venturi tube; and meanwhile, starting a timing unit for timing, finishing self-cleaning after the timing time is up, and switching the variable-section supercharger and the EGR valve by the electric control unit to normally operate to ensure the normal operation of the engine. Therefore, the system has the advantages of low cost and easy operation, and the self-cleaning process is controllable and automatic.
As shown in fig. 6, the system further includes a preset unit electrically connected to the electronic control unit, and the preset unit stores a preset range of fuel injection amount, a preset range of engine speed, a preset range of intake air temperature, a preset range of engine temperature, a preset range of exhaust air temperature, and a preset self-cleaning driving pressure difference Δ P in the electronic control unit; the whole system is reliably operated through the presetting unit.
As shown in fig. 1, the system further comprises a first pressure sensor 1, a second pressure sensor 2 and a PID controller which are respectively electrically connected with the electronic control unit ECU, wherein the first pressure sensor 1 is arranged at the exhaust port, and the second pressure sensor 2 is arranged at the air inlet; the real-time driving pressure difference delta P of the variable-section supercharger is obtained through the first pressure sensor 1 and the second pressure sensor 2, and the variable-section supercharger 4 is controlled by the electronic control unit ECU through the PID controller to carry out closed-loop control through presetting the self-cleaning driving pressure difference delta P, so that the self-cleaning is ensured to be reliably carried out. In the same way, the opening degree of the EGR valve 5 is controlled through the calibrated opening degree, and the self-cleaning is ensured to be reliably carried out.
The above-described preferred embodiments of the present invention are not intended to limit the present invention, and any modifications, equivalent improvements in the method of self-cleaning an exhaust venturi for an engine, etc., which are made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A method of self-cleaning an exhaust gas venturi for an engine, comprising the steps of:
step one, judging whether a self-cleaning condition is established;
step two, if the result is true, generating a corresponding control signal;
starting self-cleaning timing according to a control signal, controlling the opening of an EGR valve to be larger than 0, controlling a supercharger to adjust a driving pressure difference delta P to be a self-cleaning driving pressure difference delta P, controlling the self-cleaning driving pressure difference delta P to be negative, enabling fresh air flowing through a compressor to reversely flow through an EGR pipeline under the action of the pressure difference, carrying out back flushing cleaning on a Venturi tube, wherein the driving pressure difference delta P is the difference between exhaust pressure and intake pressure, the exhaust pressure is acquired through a first pressure sensor arranged at an exhaust port, and the intake pressure is acquired through a second pressure sensor arranged at an intake port;
and step four, when the timing time reaches preset time T1, switching the supercharger and the EGR valve to normally operate.
2. The method of self-cleaning an exhaust gas venturi for an engine of claim 1, wherein said step three further comprises the steps of:
acquiring the rotating speed and the fuel injection quantity of an engine;
searching a map table of the self-cleaning driving pressure difference delta P according to the rotating speed and the fuel injection quantity of the engine, and acquiring a preset self-cleaning driving pressure difference delta P;
and controlling the real-time self-cleaning driving pressure difference delta P of the supercharger to perform PID closed-loop regulation by taking the preset self-cleaning driving pressure difference delta P as a target.
3. The method of self-cleaning an exhaust gas venturi for an engine of claim 1, wherein said step three further comprises the steps of:
acquiring the rotating speed and the fuel injection quantity of an engine;
searching a map table of the opening of the EGR valve according to the rotating speed and the fuel injection quantity of the engine to obtain a preset opening;
and controlling the EGR valve to operate at a preset opening degree.
4. The method of self-cleaning an exhaust gas venturi for an engine according to any one of claims 1 to 3, wherein the first step, in particular, comprises the steps of:
acquiring fuel injection quantity, engine rotating speed, air inlet temperature, mileage, air inlet temperature, engine temperature and exhaust temperature;
judging whether the fuel injection quantity is within a preset range;
judging whether the rotating speed of the engine is within a preset range;
judging whether the mileage is larger than a preset self-cleaning mileage or not;
judging whether the air inlet temperature is within a preset range;
judging whether the temperature of the engine is within a preset range or not;
judging whether the exhaust temperature is within a preset range;
if the oil injection quantity and the engine rotating speed are in the preset range, the mileage is larger than the preset self-cleaning mileage, and the air inlet temperature, the engine temperature and the exhaust temperature are in the preset range, the self-cleaning condition is established;
and then, the fourth step further comprises mileage zero clearing.
5. The system for automatically cleaning the waste gas venturi tube for the engine comprises an electric control unit, and is characterized by further comprising an automatic cleaning monitoring unit, a variable cross-section supercharger, an EGR valve, a timing unit, a first pressure sensor and a second pressure sensor, wherein the automatic cleaning monitoring unit, the variable cross-section supercharger, the EGR valve, the timing unit, the first pressure sensor and the second pressure sensor are respectively electrically connected with the electric control unit;
the self-cleaning monitoring unit is used for judging whether a self-cleaning condition is satisfied;
the variable cross-section supercharger enables fresh air flowing through the compressor to reversely flow through the EGR pipeline under the action of differential pressure by adjusting the driving differential pressure delta P to be negative, and back flushing cleaning is carried out on the venturi tube, wherein the driving differential pressure delta P is the difference between exhaust pressure acquired by the first pressure sensor and intake pressure acquired by the second pressure sensor;
the EGR valve is used for keeping the opening degree not zero when the self-cleaning condition is met;
the timing unit is used for timing self-cleaning time;
the self-cleaning monitoring unit transmits an electric signal corresponding to whether the self-cleaning condition is met or not to the electric control unit, and the electric control unit controls the variable-section supercharger, the EGR valve and the timing unit according to the electric signal.
6. The system for automatically cleaning an exhaust gas venturi of an engine according to claim 5, wherein the self-cleaning monitoring unit comprises an oil injection amount monitoring unit, an engine speed monitoring unit, a mileage monitoring unit, an intake air temperature monitoring unit, an engine temperature monitoring unit and an exhaust air temperature monitoring unit which are electrically connected with the electronic control unit, respectively.
7. The system of claim 6, further comprising a presetting unit electrically connected with the electronic control unit, wherein the presetting unit stores a preset range of fuel injection quantity, a preset range of engine speed, a preset range of intake air temperature, a preset range of engine temperature, a preset range of exhaust air temperature and a preset self-cleaning driving pressure difference Δ P in the electronic control unit.
8. The system for automatically cleaning an exhaust gas venturi of an engine as claimed in claim 6 or 7, further comprising a PID controller electrically connected to the electronic control unit, respectively, wherein the electronic control unit controls the PID controller to adjust the opening degree of the variable-section supercharger according to the first pressure sensor and the second pressure sensor.
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| CN111715652A (en) * | 2020-05-06 | 2020-09-29 | 中国船舶重工集团公司第七O三研究所无锡分部 | Method for determining cleaning time of water solution of through-flow part of marine gas turbine |
| CN112282981B (en) * | 2020-09-17 | 2021-12-21 | 潍柴动力股份有限公司 | Engine system with EGR valve cleaning and method for reducing EGR valve icing |
| CN113019722B (en) * | 2020-12-03 | 2022-12-06 | 中国舰船研究设计中心 | Multi-stage rotational flow cavitation system with self-cleaning function |
| CN112504681B (en) * | 2020-12-21 | 2023-03-21 | 潍柴动力股份有限公司 | Engine Venturi carbon deposition detection method, device, equipment and storage medium |
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| DE102006009153A1 (en) * | 2006-02-24 | 2007-08-30 | Mahle International Gmbh | Exhaust gas recirculation device |
| US20140158099A1 (en) * | 2012-12-10 | 2014-06-12 | Bendix Commercial Vehicle Systems Llc | System and Method for Improved Emissions Control |
| JP6307842B2 (en) * | 2013-11-11 | 2018-04-11 | 富士通株式会社 | ENGINE CONTROL DEVICE, METHOD, AND PROGRAM |
| CN104863731B (en) * | 2015-06-08 | 2017-11-07 | 潍柴动力股份有限公司 | The self cleaning method of EGR valve |
| IT201700044961A1 (en) * | 2017-04-26 | 2018-10-26 | Fpt Motorenforschung Ag | MOTOR SYSTEM WITH INTERNAL COMBUSTION AND FUNCTIONING OF THE SAME |
| CN109827620A (en) * | 2018-12-26 | 2019-05-31 | 潍柴动力股份有限公司 | A kind of Venturi meter |
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