CN116838505A - EGR (exhaust gas recirculation) system of hybrid supercharged engine and control method - Google Patents
EGR (exhaust gas recirculation) system of hybrid supercharged engine and control method Download PDFInfo
- Publication number
- CN116838505A CN116838505A CN202310554580.8A CN202310554580A CN116838505A CN 116838505 A CN116838505 A CN 116838505A CN 202310554580 A CN202310554580 A CN 202310554580A CN 116838505 A CN116838505 A CN 116838505A
- Authority
- CN
- China
- Prior art keywords
- egr
- valve
- engine
- air
- opening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000001914 filtration Methods 0.000 claims abstract description 8
- 239000003054 catalyst Substances 0.000 claims description 16
- 239000002699 waste material Substances 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 10
- 238000011144 upstream manufacturing Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000012795 verification Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 238000002156 mixing Methods 0.000 abstract description 9
- 239000007789 gas Substances 0.000 description 29
- 239000000446 fuel Substances 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Abstract
The application discloses an EGR system and a control method of a hybrid supercharged engine, wherein the EGR system comprises an air filtering air inlet channel, an air inlet manifold air inlet channel, an engine exhaust channel and an EGR air channel, and the air filtering air inlet channel comprises an air flowmeter and a gas compressor; the control method comprises the steps of confirming whether EGR is started or not according to the full working condition of the engine; inquiring an EGR calibration model according to the actual working condition to obtain the opening of the target EGR valve, feeding back the opening of the actual EGR valve to obtain a difference value, converting the difference value into an EGR valve motor PWM signal, and dynamically adjusting the opening of the EGR valve. By canceling the mixing valve and related connecting pieces, the flow feedback of air is changed from the flow feedback of the mixing valve into the flow feedback of the air flow meter, the actual EGR rate is obtained by directly calculating the flow at the EGR valve, the closed-loop variables required by the control method are reduced, the space position and the cost are reduced, and the EGR rate is effectively controlled.
Description
Technical Field
The application relates to the technical field of automobile engines, in particular to an EGR (exhaust gas recirculation) system of a hybrid supercharged engine and a control method.
Background
In recent years, the common application technology of the air intake and exhaust system of the hybrid supercharged engine generally comprises turbocharging and low-pressure cooling EGR, and compared with the traditional supercharged engine, the air intake at the compressor end of the turbocharger under most working conditions of the engine is not only provided with fresh air which is filtered, but also the exhaust gas from the three-way catalyst is added to be introduced into a cylinder for re-combustion circulation; the low-pressure cooling EGR technology can reduce the temperature of a combustion chamber, improve the working efficiency of an engine, improve the combustion environment, reduce the load of the engine, effectively reduce the knocking of the engine, reduce the emission of NO compounds and prolong the service life of all parts of the engine.
In the actual work of an engine, the EGR rate must be accurately controlled, if the introduced EGR rate is too low, the engine is difficult to achieve the expected energy-saving and emission-reduction effect, if the EGR rate is too high, the engine combustion is unstable, the fuel economy is poor, and the key of the control of the EGR system is to accurately control the EGR rate to achieve the optimal EGR rate, so that the fuel utilization rate is improved, and the fuel consumption is reduced. In order to realize accurate control of the EGR rate, the EGR system comprises an EGR cooler, an EGR valve and a mixing valve; the sensors include temperature, pressure difference and position sensors of the valves; in an EGR system of the hybrid engine, an EGR gas outlet is arranged at the air filtering pipe and at the downstream of the mixing valve; when EGR is required, the mixing valve is opened, a pressure difference is generated between the front and the rear of the EGR valve, the exhaust gas is led into the air filter pipe to be mixed with fresh air, and then the mixture is led into the booster compressor, and the fresh air and the exhaust gas mass flow are controlled by controlling the opening of the mixing valve and the EGR valve, so that the target EGR rate is achieved. However, the EGR system of the current technology is complex, requiring more space arrangement and cost burden; and more closed-loop variables are needed for control, so the application provides the EGR system and the control method which have simple structure, reasonable cost and can precisely control the EGR rate.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The application is provided in view of the problems of the existing EGR system that more space is occupied in the automobile, the cost is increased, and the closed-loop variables required for control are more.
Accordingly, an object of the present application is to provide an EGR system and a control method for a hybrid supercharged engine, which aims to: the effective control of the EGR rate is realized through a simple structure, thereby reducing the oil consumption and the cost.
In order to solve the technical problems, the application provides the following technical scheme:
in a first aspect, the application provides an EGR system for a hybrid supercharged engine, including, an air filter intake path including an air flow meter and a compressor, the compressor being disposed at an output end of the air flow meter to form an air filter intake path;
the air inlet path of the air inlet manifold comprises an air inlet intercooler, a throttle valve, an air inlet temperature pressure sensor and an air inlet manifold, wherein the output end of the air compressor is sequentially connected with the air inlet intercooler, the throttle valve, the air inlet temperature pressure sensor and the input end of the air inlet manifold to form a channel;
the exhaust path of the engine comprises an engine, a turbine, a waste gate valve, a three-way catalyst and a GPF, wherein an air outlet of the engine is connected with the input ends of the turbine and the waste gate valve, and the output end of the waste gate valve and the output end of the turbine are sequentially connected with the three-way catalyst and the GPF to form a channel;
the EGR gas circuit comprises an EGR cooler, a temperature sensor, a differential pressure sensor and an EGR valve, wherein the input end of the EGR cooler is arranged between the three-way catalyst and the GPF, the EGR cooler is sequentially connected with the temperature sensor, the differential pressure sensor and the EGR valve, and the output end of the EGR valve is communicated with the input end of the air compressor.
As a preferable aspect of the EGR system of the hybrid supercharged engine according to the present application, wherein: the turbine is coaxially connected with the air compressor, and the pinch roller is coaxially driven to rotate by utilizing the energy of waste gas.
As a preferable aspect of the EGR system of the hybrid supercharged engine according to the present application, wherein: the waste gate valve enables the actual boost pressure to reach the target boost pressure by controlling the opening degree of the valve; the GPF particle trap collects oil and gas particulates passing through the three-way catalyst.
As a preferable aspect of the EGR system of the hybrid supercharged engine according to the present application, wherein: the EGR valve adopts a butterfly valve as a normally closed valve; the opening degree of the EGR valve determines the EGR flow and the EGR rate, and the opening degree is controlled by an engine electronic control unit ECU through a direct current motor and a duty ratio signal.
In a second aspect, an embodiment of the present application provides a method for controlling an EGR system of a hybrid supercharged engine, including the steps of:
scanning the opening degree and the EGR rate of an EGR valve of an engine under all working conditions, and initially selecting the optimal EGR rate;
verifying the full working condition of the EGR calibration model;
determining whether to open EGR according to the full working condition of the engine;
inquiring an EGR calibration model according to the actual working condition to obtain the opening of the target EGR valve, feeding back the opening of the actual EGR valve to obtain a difference value, converting the difference value into a PWM signal of a motor of the EGR valve (404), and dynamically adjusting the opening of the EGR valve.
As a preferable mode of the EGR system control method of the hybrid supercharged engine of the present application, wherein: the initially-selected optimal EGR rate comprises a target value of a preset EGR rate, the EGR and variable valve timing technology VVT of the engine are scanned in a combined mode, and the target EGR rate and the VVT of an opened EGR valve are checked and optimized aiming at a characteristic oil consumption point and a common working condition area point.
As a preferable mode of the EGR system control method of the hybrid supercharged engine of the present application, wherein: the verification of the full working condition of the EGR calibration model comprises the steps of adjusting the target EGR rate and the VVT opening and closing angle time and the ignition angle time of an engine valve in the engine running condition, verifying that the quantity of the air entering an engine cylinder and the EGR exhaust gas reaches the best, the ignition angle is the best, and verifying whether the combustion efficiency is the best.
As a preferable mode of the EGR system control method of the hybrid supercharged engine of the present application, wherein: when the calculated EGR mass flow is the ECU demand of the EGR system, an EGR valve is opened, and after the exhaust gas is cooled to the EGR outlet and mixed with fresh air from the air filter end, the exhaust gas is introduced into a supercharger compressor to be supercharged, and an EGR mass flow calculation equation at the EGR valve is as follows:
P in/ wherein ,representing the mass flow of gas through the EGR valve body per unit time; p (P) out
Representing the ratio of the absolute pressure of the gas upstream and downstream of the valve body; a is that eff Representing the effective flow area of the current valve opening; t (T) in Indicating the thermodynamic temperature upstream of the valve body, R indicating the gas constant;the flow correction coefficient based on the upstream-downstream pressure ratio of the valve body is shown.
As a preferable mode of the EGR system control method of the hybrid supercharged engine of the present application, wherein: the EGR rate is calculated according to the fresh air mass flow obtained by the air flow meter, the EGR actual mass flow and the system delay time, and the calculation equation is as follows:
wherein ,representing the actual EGR rate in the cylinder calculated by the control model; />Representing the mass flow of gas through the EGR valve body per unit time; m is M samf Representing the fresh air mass flow measured by the air mass flow meter; f (T) egrdly ) A correction coefficient indicating the system delay time to the in-cylinder EGR rate.
As a preferable mode of the EGR system control method of the hybrid supercharged engine of the present application, wherein: the step of dynamically adjusting the opening of the EGR valve comprises calculating a difference between the opening of the EGR valve and a target opening of the EGR valve, and when the difference exists, returning to adjust the EGR valve to the target opening; meanwhile, based on the deviation of the actual EGR rate and the target EGR rate, the ignition angle and the target angle correction quantity of the intake and exhaust VVT are calculated in combination with the current working condition of the engine, and when the deviation exists, the combustion efficiency and the fuel economy of the engine can be improved through the correction of the VVT and the ignition angle.
The application has the beneficial effects that: 1) The EGR system of the hybrid supercharger engine provides the EGR mass flow required by the hybrid supercharger engine, has a compact structure, optimizes the space arrangement, increases the durability of the system and realizes the lightweight design of the engine and the cost reduction compared with the traditional EGR system; 2) According to the control method of the EGR system of the hybrid supercharged engine, provided by the application, the required EGR rate following the actual working condition of the engine is accurately and dynamically realized by adopting a calibration pre-control model and a PID control mode, so that the control requirement is met; adverse effects caused by too high or too low EGR rate are prevented, so that the oil consumption is reduced, and the fuel utilization rate is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a schematic diagram of the overall structure of an EGR system of a hybrid supercharged engine according to the present application.
FIG. 2 is a flow chart of a method of controlling an EGR system of a hybrid supercharged engine according to the present application.
Fig. 3 is a logic diagram of an EGR system control method of the hybrid supercharged engine of the present application.
Fig. 4 is an engine key region fuel consumption map of the EGR system control method of the hybrid supercharged engine of the present application.
Fig. 5 is a schematic diagram showing a conventional structure of an EGR system of the hybrid supercharged engine of the present application.
FIG. 6 is a conventional flow chart of a method of controlling an EGR system of a hybrid supercharged engine according to the present application.
Fig. 7 is a conventional logic diagram of an EGR system control method of a hybrid supercharged engine of the present application.
Fig. 8 is a conventional engine key region fuel consumption map of an EGR system control method of a hybrid supercharged engine according to the present application.
FIG. 9 is an actual EGR rate full condition MAP table and corresponding EGR opening relationship MAP for an EGR system control method for a hybrid supercharged engine of the present application.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will become more readily apparent, a more particular description of the application will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Further, in describing the embodiments of the present application in detail, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of description, and the schematic is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Example 1
Referring to fig. 1 and 5, in a first embodiment of the present application, an EGR system for a hybrid supercharged engine is provided, which includes an air-filtering intake path 100 including an air flow meter 101 and a compressor 102, the compressor being disposed at an output end of the air flow meter 101 to form an air-filtering intake passage; wherein the air flow meter 101 measures the flow of fresh air filtered by the supercharger from the air filtering end; the air filter intake passage 100 is also referred to as a supercharger compressor 102 intake passage.
The intake manifold air inlet path 200 comprises an intake intercooler 201, a throttle valve 202, an intake temperature pressure sensor 203 and an intake manifold 204, wherein the output end of the compressor 102 is sequentially connected with the input ends of the intake intercooler 201, the throttle valve 202, the intake temperature pressure sensor 203 and the intake manifold 204 to form a channel; further, the charge air intercooler 201 cools the high-temperature and high-pressure air after being boosted by the booster compressor 102, and the gas butterfly valve electric control throttle 202 controls the air inflow entering the intake manifold 204; an intake air temperature and pressure sensor 203 measures the temperature and pressure of the gas in the cavity of an intake manifold 204; the intake manifold intake path 200 is also referred to as the supercharger compressor 102 exhaust path.
The engine exhaust path 300 comprises an engine 301, a turbine 302, a waste gate valve 303, a three-way catalyst 303 and a GPF304, wherein an air outlet of the engine 301 is connected with the input ends of the turbine 302 and the waste gate valve 303, and an output end of the waste gate valve 303 and an output end of the turbine 302 are sequentially connected with the three-way catalyst 303 and the GPF304 to form a channel; further, the three-way catalyst 303 oxidizes and reduces harmful substances in the exhaust gas to substances harmless to the atmosphere; GPF304 collects the hydrocarbon particulates after passing through three-way catalyst 303.
The EGR gas circuit 400 includes an EGR cooler 401, a temperature sensor 402, a differential pressure sensor 403, and an EGR valve 404, wherein an input end of the EGR cooler 401 is disposed between the three-way catalyst 303 and the GPF304, the EGR cooler 401 is sequentially connected with the temperature sensor 402, the differential pressure sensor 403, and the EGR valve 404, and an output end of the EGR valve 404 is communicated with an input end of the compressor 102.
The turbine 302 is coaxially coupled to the compressor 102 to coaxially rotate the puck by the exhaust energy.
The waist gate valve 303 controls the opening of the valve so that the actual boost pressure reaches the target boost pressure; the GPF304 particulate trap collects the hydrocarbon particulates that pass through the three way catalyst 303.
The EGR valve 404 adopts a butterfly valve as a normally closed valve; the opening degree of the valve of the EGR valve 404 determines the EGR flow and the EGR rate, and the opening degree is controlled by an engine electronic control unit ECU through a direct current motor and a duty ratio signal; wherein, the EGR cooler 401 cools the high-temperature waste gas from the catalyst, so as to avoid the pre-combustion knocking caused by heating fresh air; the EGR temperature sensor 402 measures the cooled EGR upstream exhaust gas temperature; the EGR pressure difference sensor 403 measures the gas pressure upstream and downstream of the EGR valve 404.
In summary, a mixing valve in a common EGR system is eliminated, the flow feedback of fresh air is changed from the flow feedback of the mixing valve to the detection of the intake flow of the fed fresh air by the air flowmeter 101, and the actual EGR rate is obtained by directly calculating the flow at the EGR valve 404; the structural arrangement and the cost save the mixing valve and the related connecting fasteners, improve the compactness of the engine and reduce the cost expenditure of a single engine.
Example 2
Referring to fig. 2 to 4 and fig. 6 to 8, a second embodiment of the present application is a second embodiment, which is different from the first embodiment, in that: the control method of the EGR system of the hybrid supercharged engine comprises the following detailed steps:
the opening degree and EGR rate of the EGR valve 404 are scanned for all conditions of the engine 301, and the optimal EGR rate is initially selected.
Further, the initially preferred optimal EGR rate includes a target value of a preset EGR rate, and the EGR and engine variable valve timing technique VVT is scanned in combination to check and optimize the target EGR rate and VVT after opening the EGR valve 404 for the characteristic fuel consumption point and the common operating region point.
The verification of the full working condition of the EGR calibration model comprises the steps of adjusting the target EGR rate and the VVT opening and closing angle time and the ignition angle time of an engine valve in the engine running condition, verifying that the quantity of the air entering an engine cylinder and the EGR exhaust gas reaches the best, the ignition angle is the best, and verifying whether the combustion efficiency is the best.
And verifying the full working condition of the EGR calibration model.
According to the full-working-condition MAP table of the actual EGR rate and the corresponding EGR opening relation, as shown in FIG. 9, the EGR rate is in the use working condition section of 99.5% of the engine, the deviation between the actual EGR rate and the target EGR rate is about +/-3%, and the functional requirement of pre-control of the calibration model is met.
As shown in fig. 2 and 3, whether EGR is turned on is confirmed according to the full condition of the engine 301.
Inquiring an EGR calibration model according to the actual working condition to obtain the opening of the target EGR valve 404, feeding back the opening of the actual EGR valve 404 to obtain a difference value, converting the difference value into a PWM signal of a motor of the EGR valve 404, and dynamically adjusting the opening of the EGR valve 404.
When the calculated EGR mass flow is the ECU demand of the EGR system, an EGR valve is opened, and after the exhaust gas is cooled to the EGR outlet and mixed with fresh air from an air filter end, the exhaust gas is introduced into the supercharger compressor 102 for supercharging, and an EGR mass flow calculation equation at the EGR valve is as follows:
wherein ,representing the mass flow of gas through the EGR valve body per unit time; p (P) in /P out Representing the ratio of the absolute pressure of the gas upstream and downstream of the valve body; a is that eff Representing the effective flow area of the current valve opening; t (T) in Indicating the thermodynamic temperature upstream of the valve body, R indicating the gas constant; />The flow correction coefficient based on the upstream-downstream pressure ratio of the valve body is shown.
The EGR rate is calculated according to the fresh air mass flow obtained by the air flow meter, the EGR actual mass flow and the system delay time, and the calculation equation is as follows:
wherein ,representing the actual EGR rate in the cylinder calculated by the control model; />Representing the mass flow of gas through the EGR valve body per unit time; m is M samf Representing the fresh air mass flow measured by the air mass flow meter 101; f (T) egrdly ) A correction coefficient indicating the system delay time to the in-cylinder EGR rate.
The EGR rate is calculated according to the fresh air mass flow obtained by the air flow meter, the EGR actual mass flow and the system delay time, and the calculation equation is as follows:
wherein ,representing the actual EGR rate in the cylinder calculated by the control model; />Representing the mass flow of gas through the EGR valve body per unit time; m is M samf Representing the fresh air mass flow measured by the air mass flow meter 101; f (T) egrdly ) A correction coefficient indicating the system delay time to the in-cylinder EGR rate.
Calculating a difference value between the EGR mass flow and the target EGR mass flow, and when the difference value exists, returning to control the EGR valve to the target opening; meanwhile, based on the deviation of the actual EGR rate and the target EGR rate, calculating an ignition angle and an intake and exhaust VVT target angle correction amount by combining the current working condition of the engine; when the deviation is ensured, the combustion efficiency and the fuel economy of the engine can be improved by correcting the VVT and the ignition angle.
As shown in FIG. 4, the fuel consumption diagram of the hybrid supercharged engine in the using process of the method is shown in FIG. 8, and the fuel consumption diagram of the structure of the traditional hybrid supercharged engine is shown in FIG. 8.
In summary, the EGR system of the hybrid supercharger engine provides the EGR mass flow required by the hybrid supercharger engine, has a compact structure, optimizes the space arrangement, increases the durability of the system and realizes the lightweight design of the engine and the cost reduction compared with the traditional EGR system.
According to the control method of the EGR system of the hybrid supercharged engine, provided by the application, the required EGR rate following the actual working condition of the engine is accurately and dynamically realized by adopting a calibration pre-control model and a PID control mode, so that the control requirement is met; adverse effects caused by excessively high or excessively low EGR rate are prevented, and optimal economic benefits of customers are ensured.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present application may be modified or substituted without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered in the scope of the claims of the present application.
Claims (10)
1. An EGR system of a hybrid supercharged engine, characterized in that: comprising the steps of (a) a step of,
the air filtering air inlet path (100) comprises an air flow meter (101) and a gas compressor (102), wherein the gas compressor is arranged at the output end of the air flow meter (101) to form an air filtering air inlet channel;
the air inlet path (200) of the air inlet manifold comprises an air inlet intercooler (201), a throttle valve (202), an air inlet temperature pressure sensor (203) and an air inlet manifold (204), wherein the output end of the air compressor (102) is sequentially connected with the air inlet intercooler (201), the throttle valve (202), the air inlet temperature pressure sensor (203) and the input end of the air inlet manifold (204) to form a channel;
an engine exhaust path (300) comprising an engine (301), a turbine (302), a waste gate valve (303), a three-way catalyst (303) and a GPF (304), wherein an air outlet of the engine (301) is connected with the input ends of the turbine (302) and the waste gate valve (303), and an output end of the waste gate valve (303) and an output end of the turbine (302) are sequentially connected with the three-way catalyst (303) and the GPF (304) to form a channel;
EGR gas circuit (400), including EGR cooler (401), temperature sensor (402), pressure differential sensor (403), and EGR valve (404), the input of EGR cooler (401) set up in between three way catalyst converter (303) and GPF (304), EGR cooler (401) with temperature sensor (402), pressure differential sensor (403) and EGR valve (404) are connected in proper order, the output of EGR valve (404) with the input of compressor (102) communicates.
2. The EGR system of a hybrid supercharged engine of claim 1 wherein: the turbine (302) is coaxially connected with the compressor (102), and the pinch roller is coaxially driven to rotate by using the energy of the exhaust gas.
3. The EGR system of a hybrid supercharged engine of claim 2 wherein: the waste gate valve (303) controls the opening of the valve to enable the actual boost pressure to reach the target boost pressure; the GPF (304) particle trap collects oil and gas particulates passing through the three way catalyst (303).
4. An EGR system of a hybrid supercharged engine according to claim 3, wherein: the EGR valve (404) adopts a butterfly valve as a normally closed valve; the opening degree of the valve of the EGR valve (404) determines the EGR flow and the EGR rate, and the opening degree is controlled by an electronic control unit ECU of the engine through a direct current motor and a duty ratio signal.
5. An EGR system control method for a hybrid supercharged engine, based on the EGR system for a hybrid supercharged engine according to any one of claims 1 to 4, characterized in that: the control method comprises the following steps:
scanning the opening degree and the EGR rate of an EGR valve (404) under the full working condition of the engine (301), and initially selecting the optimal EGR rate;
verifying the full working condition of the EGR calibration model;
confirming whether EGR is opened or not according to the full working condition of the engine (301);
inquiring an EGR calibration model according to the actual working condition to obtain the opening of the target EGR valve (404), feeding back the opening of the target EGR valve (404) to obtain a difference value according to the opening of the actual EGR valve (404), converting the difference value into a PWM signal of a motor of the EGR valve (404), and dynamically adjusting the opening of the EGR valve (404).
6. The EGR system control method of a hybrid supercharged engine according to claim 5, characterized in that: the initially-selected optimal EGR rate comprises a target value of a preset EGR rate, the EGR and variable valve timing technology VVT of the engine are scanned in a combined mode, and the target EGR rate and the VVT of an EGR valve (404) after being opened are checked and optimized aiming at a characteristic oil consumption point and a common working condition area point.
7. The EGR system control method of a hybrid supercharged engine according to claim 6, characterized in that: the verification of the full working condition of the EGR calibration model comprises the steps of adjusting the target EGR rate and the VVT opening and closing angle time and the ignition angle time of an engine valve in the engine running condition, verifying that the quantity of the air entering an engine cylinder and the EGR exhaust gas reaches the best, the ignition angle is the best, and verifying whether the combustion efficiency is the best.
8. The EGR system control method of a hybrid supercharged engine according to claim 7, characterized in that: when the calculated EGR mass flow is the ECU demand of the EGR system, an EGR valve is opened, and after the exhaust gas is cooled to the EGR outlet and mixed with fresh air from the air filter end, the exhaust gas is introduced into a supercharger compressor (102) to be supercharged, and an EGR mass flow calculation equation at the EGR valve is as follows:
wherein ,representing the mass flow of gas through the EGR valve body per unit time; p (P) in /P out Representing the ratio of the absolute pressure of the gas upstream and downstream of the valve body; a is that eff Representing the effective flow area of the current valve opening; t (T) in Indicating the thermodynamic temperature upstream of the valve body, R indicating the gas constant; />The flow correction coefficient based on the upstream-downstream pressure ratio of the valve body is shown.
9. The EGR system control method of a hybrid supercharged engine according to claim 8, characterized in that: the EGR rate is calculated according to the fresh air mass flow obtained by the air flow meter, the EGR actual mass flow and the system delay time, and the calculation equation is as follows:
wherein ,representing the actual EGR rate in the cylinder calculated by the control model; />Representing the mass flow of gas through the EGR valve body per unit time; m is M samf Representing the fresh air mass flow measured by the air mass flow meter (101); f (T) egrdly ) A correction coefficient indicating the system delay time to the in-cylinder EGR rate.
10. The EGR system control method of a hybrid supercharged engine according to claim 9, characterized in that: the step of dynamically adjusting the opening of the EGR valve (404) comprises calculating a difference between the opening of the EGR valve and a target opening of the EGR valve, and when the difference exists, returning to adjust the EGR valve (404) to the target opening; and meanwhile, based on the deviation of the actual EGR rate and the target EGR rate, calculating an ignition angle and an intake and exhaust VVT target angle correction amount by combining the current working condition of the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310554580.8A CN116838505A (en) | 2023-05-17 | 2023-05-17 | EGR (exhaust gas recirculation) system of hybrid supercharged engine and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310554580.8A CN116838505A (en) | 2023-05-17 | 2023-05-17 | EGR (exhaust gas recirculation) system of hybrid supercharged engine and control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116838505A true CN116838505A (en) | 2023-10-03 |
Family
ID=88167812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310554580.8A Pending CN116838505A (en) | 2023-05-17 | 2023-05-17 | EGR (exhaust gas recirculation) system of hybrid supercharged engine and control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116838505A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117418946A (en) * | 2023-12-18 | 2024-01-19 | 潍柴动力股份有限公司 | EGR system, control method thereof and engine |
-
2023
- 2023-05-17 CN CN202310554580.8A patent/CN116838505A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117418946A (en) * | 2023-12-18 | 2024-01-19 | 潍柴动力股份有限公司 | EGR system, control method thereof and engine |
| CN117418946B (en) * | 2023-12-18 | 2024-04-16 | 潍柴动力股份有限公司 | EGR system, control method thereof and engine |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3298358B2 (en) | Method and apparatus for controlling compression end temperature in diesel engine | |
| CN102200050B (en) | System for inducting air into engine | |
| US6209530B1 (en) | Control system for exhaust gas recirculation system | |
| US8596252B2 (en) | Emission control system for an engine having a two-stage turbocharger | |
| JP5444996B2 (en) | Internal combustion engine and control method thereof | |
| JP5169439B2 (en) | Internal combustion engine control device and internal combustion engine control system | |
| JP5187123B2 (en) | Control device for internal combustion engine | |
| US10344688B2 (en) | Apparatus and method for engine control | |
| JP2008546946A (en) | Supercharged diesel engine | |
| CN104791148A (en) | Low-pressure EGR introduction device capable of realizing high EGR rate and low-pressure EGR introduction method | |
| KR20170139926A (en) | Engine systme having exahust gas recirculation apparatus and control mehtod using the same | |
| EP2418369A1 (en) | System for controlling exhaust gas temperature of an internal combustion engine with an exhaust gas after-treatment device and prime mover including same | |
| JP2014034959A (en) | Exhaust gas recirculation device of engine with supercharger | |
| CN116838505A (en) | EGR (exhaust gas recirculation) system of hybrid supercharged engine and control method | |
| JP2011001877A (en) | Internal combustion engine equipped with mechanical supercharger and supercharging method therefor | |
| CN109595085B (en) | Control device for internal combustion engine | |
| CN110748442A (en) | Throttle-free air inlet system of spark ignition engine and power control method | |
| JP2019120204A (en) | Engine control device | |
| JP4206934B2 (en) | Supercharging system for internal combustion engines | |
| JP2010168954A (en) | Control device for internal combustion engine | |
| US20210239058A1 (en) | Method of controlling temperature of exhaust purification device of internal combustion engine, and internal combustion engine control device | |
| JP2019094854A (en) | Control device of internal combustion engine | |
| KR20190071077A (en) | Engine system for exhausting water and method using the same | |
| CN219910983U (en) | High-efficiency recycling type integrated gas mixing control system | |
| JP6835655B2 (en) | EGR device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |