CN117869089A - Exhaust gas flow calculation method and device of exhaust gas recirculation system, medium and ECU - Google Patents
Exhaust gas flow calculation method and device of exhaust gas recirculation system, medium and ECU Download PDFInfo
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- CN117869089A CN117869089A CN202311679179.3A CN202311679179A CN117869089A CN 117869089 A CN117869089 A CN 117869089A CN 202311679179 A CN202311679179 A CN 202311679179A CN 117869089 A CN117869089 A CN 117869089A
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- 238000004364 calculation method Methods 0.000 title claims abstract description 60
- 238000000034 method Methods 0.000 claims abstract description 24
- 239000007789 gas Substances 0.000 claims description 195
- 238000012937 correction Methods 0.000 claims description 14
- 239000000446 fuel Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 6
- 239000002912 waste gas Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0065—Specific aspects of external EGR control
- F02D41/0072—Estimating, calculating or determining the EGR rate, amount or flow
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D21/00—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas
- F02D21/06—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air
- F02D21/08—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine
- F02D2021/083—Controlling engines characterised by their being supplied with non-airborne oxygen or other non-fuel gas peculiar to engines having other non-fuel gas added to combustion air the other gas being the exhaust gas of engine controlling exhaust gas recirculation electronically
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
The invention relates to the field of engine control, in particular to a method, a device, a medium and an ECU for calculating exhaust gas flow of an exhaust gas recirculation system. According to the invention, the first exhaust gas flow is reversed through the engine output torque, and calculation can be completed only according to the measurable engine output torque; compared with the traditional method that the two ends of the EGR valve are respectively used for the first exhaust gas flow according to the gas pressure and the temperature, the number of times of using an error model can be reduced, and the calculation accuracy of the exhaust gas flow is obviously improved; the ignition advance angle of the engine can be enabled to run under the starting sudden vibration boundary, so that the thermal efficiency of the engine is improved, the control redundancy of the engine is reduced, and the thermal efficiency of the engine is improved; compared with the traditional mode of adding the sensor, a plurality of sensors and other hardware can be saved, and the production cost is remarkably reduced.
Description
Technical Field
The invention relates to the field of engine control, in particular to a method, a device, a medium and an ECU for calculating exhaust gas flow of an exhaust gas recirculation system.
Background
In pursuit of higher engine fuel economy, and in order to improve engine thermal efficiency, EGR (Exhaust Gas recirculation) technology is increasingly applied to engines. The technology is that part of the exhaust gas discharged by the engine is returned to the intake manifold and re-enters the engine cylinder together with fresh mixed gas. Because the exhaust gas contains a large amount of polyatomic gas such as CO2, and the like, and the gas cannot burn but absorbs a large amount of heat due to the high specific heat capacity, the highest burning temperature of the mixed gas in the cylinder is reduced, so that the compression ratio of the engine can be increased in design, and the ignition advance angle of the engine is increased, thereby achieving the aim of improving the thermal efficiency of the engine.
In the practical application process, in order to further increase the effect of EGR in the system, an external EGR architecture is introduced into most engines. Under the drive of market, in order to reduce the hardware cost of the control system, the pressure of an intake pressure sensor and the back pressure of exhaust are used as the front-back pressure difference of an EGR valve, and an ideal gas equation is appliedCalculating the engine intake air amount is currently the preferred solution in most control systems. The application of the EGR technology on the control system makes the in-cylinder air inflow model with certain error more difficult to ensure the accuracy of the model due to the influence of multiple paths of EGR air inflow.
Disclosure of Invention
The invention discloses a method, a device, a medium and an ECU for calculating the exhaust gas flow of an exhaust gas recirculation system, which can improve the accuracy of the exhaust gas flow calculation of the exhaust gas recirculation system.
In order to achieve the above object, in one aspect, a method for calculating an exhaust gas flow rate of an exhaust gas recirculation system is provided, which specifically comprises the following steps:
acquiring output torque of an engine, and calculating fresh air inflow of the engine;
the fresh air intake amount is subtracted from the total intake amount to calculate the first exhaust gas flow.
The advantage of this embodiment is that the first exhaust gas flow is reversed by the engine output torque, which only requires to complete the calculation based on the measurable engine output torque; compared with the traditional method that the two ends of the EGR valve are respectively used for the first exhaust gas flow according to the gas pressure and the temperature, the number of times of using an error model can be reduced, and the calculation accuracy of the exhaust gas flow is obviously improved; the ignition advance angle of the engine can be enabled to run under the starting sudden vibration boundary, so that the thermal efficiency of the engine is improved, the control redundancy of the engine is reduced, and the thermal efficiency of the engine is improved; compared with the traditional mode of adding the sensor, a plurality of sensors and other hardware can be saved, and the production cost is remarkably reduced.
Preferably, the method for obtaining the total intake air amount is as follows:
and acquiring the pressure and the temperature of the intake manifold through a pressure temperature sensor, and calculating the total air inflow by combining an ideal gas equation.
Alternatively, the method for acquiring the total intake air amount is as follows:
the known total intake air amount is obtained by querying the EMS system.
Further, the first exhaust gas flow rate is corrected to obtain a second exhaust gas flow rate.
Further, the specific method for obtaining the second exhaust gas flow through correction is as follows:
obtaining actual exhaust gas flow through bench calibration;
calculating a first exhaust gas flow;
integrating the difference value of the first exhaust gas flow and the actual exhaust gas flow to obtain an exhaust gas flow correction factor in unit time;
and adding an exhaust gas flow correction factor into the first exhaust gas flow calculation formula to obtain a second exhaust gas flow calculation model.
The embodiment has the advantage that by correcting the model, calculation errors due to the adoption of an ideal gas equation or other mathematical models can be compensated, and the calculation accuracy of the exhaust gas flow can be further improved.
Further, the second exhaust gas flow calculation model comprises a second exhaust gas flow calculation sub-model when the engine pure oil drives the vehicle to run under different working conditions, and/or a second exhaust gas flow calculation sub-model when the engine generates electricity, and/or a second exhaust gas flow calculation sub-model when the engine drives the vehicle to run and generates electricity at the same time.
The embodiment has the advantage that for the extended range automobile, the working condition of the engine is single, and the exhaust gas flow calculation is facilitated.
Further, the fresh air intake amount of the engine is calculated by the following specific method:
calibrating fresh air inflow, ignition angle, engine rotating speed, air-fuel ratio and actual output torque of the engine through a rack;
fitting the functional relation between the actual output torque of the engine and the fresh air inflow under different engine speeds, air-fuel ratios and ignition angles;
substituting the current engine output torque, the engine speed, the air-fuel ratio and the ignition angle into a functional relation to calculate the corresponding fresh air intake quantity.
Optionally, obtaining a reference exhaust gas flow;
if the deviation of the reference exhaust gas flow and the first exhaust gas flow is larger than the threshold value, the high flow of the waste gas recirculation system is failed;
and if the deviation of the reference exhaust gas flow and the first exhaust gas flow is smaller than the threshold value, the low flow of the exhaust gas recirculation system is failed.
Optionally, obtaining a reference exhaust gas flow;
if the deviation of the reference exhaust gas flow and the second exhaust gas flow is larger than the threshold value, the high flow of the waste gas recirculation system is failed;
and if the deviation of the reference exhaust gas flow and the second exhaust gas flow is smaller than the threshold value, the low flow of the exhaust gas recirculation system is failed.
Optionally, the specific method for acquiring the reference exhaust gas flow is as follows:
and the air pressure calculated by the exhaust back pressure model and the air pressure difference acquired by the intake pressure sensor are calculated and acquired.
Optionally, the specific method for acquiring the reference exhaust gas flow is as follows:
and adding actual measurement acquisition of a differential pressure sensor.
Optionally, the specific method for acquiring the reference exhaust gas flow is as follows:
and adding an air sensor in the air inlet manifold to acquire oxygen flow and reference exhaust gas flow.
The embodiment has the advantages that on the basis of the traditional exhaust gas flow calculation method, another exhaust gas flow calculation mode with higher precision is additionally arranged, and fault monitoring can be realized by comparing calculation results of the two modes to replace other fault monitoring algorithms or hardware.
To achieve the above object, in another aspect, there is provided an exhaust gas flow rate calculation apparatus of an exhaust gas recirculation system, comprising: the system comprises a fresh air inflow acquisition module, a total air inflow acquisition module and an exhaust gas flow calculation module;
the fresh air intake air amount acquisition module calculates fresh air intake air amount of the engine according to output torque of the engine;
the total air inflow acquisition module acquires the total air inflow of an air inlet manifold;
the exhaust gas flow calculating module calculates a first exhaust gas flow by subtracting the fresh air inflow from the total air inflow.
Further, the method further comprises the following steps: and the correction module is used for correcting the first exhaust gas flow to calculate and acquire the second exhaust gas flow.
To achieve the above object, in another aspect, a storage medium is provided with instructions stored thereon, and a processor is loaded to perform the above exhaust gas flow calculation method of an exhaust gas recirculation system.
To achieve the above object, in another aspect, there is provided an ECU including the above exhaust gas flow rate calculation device of an exhaust gas recirculation system, and/or the above storage medium.
It should be noted that, the terms "first", "second", and the like are used herein merely to describe each component in the technical solution, and do not constitute a limitation on the technical solution, and are not to be construed as indicating or implying importance of the corresponding component; elements with "first", "second" and the like mean that in the corresponding technical solution, the element includes at least one.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the technical effects, technical features and objects of the present invention will be further understood, and the present invention will be described in detail below with reference to the accompanying drawings, which form a necessary part of the specification, and together with the embodiments of the present invention serve to illustrate the technical solution of the present invention, but not to limit the present invention.
Like reference numerals in the drawings denote like parts, in particular:
fig. 1 is a schematic diagram of an EGR system.
Fig. 2 is a logic block diagram for calculating a first exhaust gas flow rate in embodiment 1.
Fig. 3 is a logic block diagram for correcting the first exhaust gas flow rate in example 1.
Fig. 4 is a logic block diagram of fault detection in embodiment 1.
Fig. 5 is a schematic flow chart of example 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. Of course, the following specific examples are set forth only to illustrate the technical solution of the present invention, and are not intended to limit the present invention. Furthermore, the parts expressed in the examples or drawings are merely illustrative of the relevant parts of the present invention, and not all of the present invention.
Example 1:
an exhaust gas flow calculating method of an exhaust gas recirculation system, an EGR system is shown in fig. 1, and specific steps are shown in fig. 2 and 5:
s1, acquiring the total air inflow.
Specifically, the pressure and the temperature of the intake manifold are obtained through a pressure temperature sensor, and the total air inflow is calculated by combining an ideal gas equation, wherein the ideal gas equation is as follows:
wherein P is the pressure (Pa) of the gas, and V is the gas volume (m 3 ) M is the gas mass (g), T is the gas temperature (DEG C), M 0 The molar mass (g/mol) and r are proportionality constants.
Alternatively, the known total intake air amount may also be obtained by querying the EMS system.
In step S1, the P22 pressure temperature sensor of FIG. 1 may be utilized in an engine control system by an ideal gas equationThe calculation result is already available in the existing EMS system and can be directly used.
S2, calculating the fresh air inflow of the engine.
Specifically, the fresh air intake amount, the ignition angle, the engine speed, the air-fuel ratio and the actual output torque of the engine are calibrated through the bench; fitting the functional relation between the actual output torque of the engine and the fresh air inflow under different engine speeds, air-fuel ratios and ignition angles; substituting the current engine output torque, the engine speed, the air-fuel ratio and the ignition angle into a functional relation to calculate the corresponding fresh air intake quantity.
In step S2, the torque model calibrated by the rack is utilized reversely, and the actual fresh air intake amount m of the engine is calculated by the power generation torque measured by the generator AIR . As in fig. 2, the actual intake air amount m AIR Is calculated by the computer.
S3, subtracting the fresh air inflow from the total air inflow to calculate a first exhaust gas flow m AGR =total intake air amount m Zyl Actual fresh air intake quantity m AIR 。
S4, correcting the first exhaust gas flow, and showing in FIG. 3.
Specifically, the actual exhaust gas flow is obtained through bench calibration; calculating a first exhaust gas flow; integrating the difference value of the first exhaust gas flow and the actual exhaust gas flow to obtain an exhaust gas flow correction factor in unit time; and adding an exhaust gas flow correction factor into the first exhaust gas flow calculation formula to obtain a second exhaust gas flow calculation model.
Specifically, the second exhaust gas flow calculation model is a second exhaust gas flow calculation sub-model when the engine generates electricity, and of course, the second exhaust gas flow calculation sub-model can also be a second exhaust gas flow calculation sub-model when the engine drives the vehicle to run through pure oil under different working conditions, and the second exhaust gas flow calculation sub-model can also be a second exhaust gas flow calculation sub-model when the engine drives the vehicle to run and generate electricity at the same time.
S5, detecting the fault of the exhaust gas recirculation system, as shown in fig. 4.
Specifically, a reference exhaust gas flow is obtained; if the deviation of the reference exhaust gas flow and the second exhaust gas flow is larger than the threshold value, the high flow of the waste gas recirculation system is failed; and if the deviation of the reference exhaust gas flow and the second exhaust gas flow is smaller than the threshold value, the low flow of the exhaust gas recirculation system is failed.
The reference exhaust gas flow can be obtained by calculating the air pressure calculated by an exhaust back pressure model and the air pressure difference acquired by an intake air pressure sensor. The actual measurement acquisition of the differential pressure sensor can also be added. The method can also be that an air sensor is added in an air inlet manifold to collect oxygen flow and obtain reference exhaust gas flow.
Alternatively, the exhaust back pressure can be obtained, and the reference exhaust gas flow can be calculated by combining the exhaust back pressure with an ideal gas equation; if the deviation of the reference exhaust gas flow and the first exhaust gas flow is larger than the threshold value, the high flow of the waste gas recirculation system is failed; and if the deviation of the reference exhaust gas flow and the first exhaust gas flow is smaller than the threshold value, the low flow of the exhaust gas recirculation system is failed.
In this embodiment, the engine output torque is obtained by mixing fresh air with gasoline and then performing work by combustion, whereas an engine employing a three-way catalyst for emission control is necessary for efficient operation of the catalyst to operate the air-fuel mixture under homogeneous combustion, i.e., 14.8kg air/1 kg gasoline. In step S2, the amount of fresh air intake is a direct cause of influencing the output torque of the engine, and in the engine control system, there is a complete torque model, and the torque model converts the actual output torque of the engine by using the current fresh air intake of the engine, the ignition angle, the engine speed and the air-fuel ratio. The calibration of the torque model is obtained in the calibration of the bench, the calibration of the bench is completed, the model is accurate, and the input quantity in the model is as follows: the ignition angle, engine speed, air-fuel ratio are all accurately obtained by system sensor or closed loop correction. From this, it is known that the engine output torque is proportional to the engine fresh air intake amount. As shown in fig. 1, the total engine intake air amount m Zyl ＝m AGR +m AIR The method comprises the steps of carrying out a first treatment on the surface of the In which exhaust gas m flowing in by EGR AGR Is a large amount of CO2 polyatomic gas and can not burn to do work. In the hybrid project, when the engine works in the power generation mode, the torque measured by the generator is measured by fresh air m in the air inlet system of the engine AIR Work is done by mixing with gasoline. Total engine intake m Zyl The ideal gas equation can be used to calculate the engine exhaust gas flow m by the intake pressure sensor AGR =total intake air amount m Zyl Fresh air intake quantity m calculated by torque of generator motor AIR 。
Example 2:
an exhaust gas flow calculation device of an exhaust gas recirculation system comprises a fresh air inflow acquisition module, a total air inflow acquisition module, an exhaust gas flow calculation module and a correction module;
the fresh air intake air amount acquisition module calculates fresh air intake air amount of the engine according to output torque of the engine;
the total air inflow acquisition module acquires the total air inflow of an air inlet manifold;
the exhaust gas flow calculation module is used for subtracting fresh air inflow from total air inflow to obtain first exhaust gas flow;
and the correction module is used for correcting the first exhaust gas flow to calculate and obtain the second exhaust gas flow.
In this embodiment, the fresh air intake amount acquisition module and the total air intake amount acquisition module may be a sensor group or a memory in which required data is stored; the exhaust gas flow calculation module and the correction module can be an ECU, an independent terminal with calculation capability and capable of being connected to the whole vehicle, or a cloud server.
It should be noted that the foregoing examples are merely for clearly illustrating the technical solution of the present invention, and those skilled in the art will understand that the embodiments of the present invention are not limited to the foregoing, and that obvious changes, substitutions or alterations can be made based on the foregoing without departing from the scope covered by the technical solution of the present invention; other embodiments will fall within the scope of the invention without departing from the inventive concept.
Claims (16)
1. The exhaust gas flow calculation method of the exhaust gas recirculation system is characterized by comprising the following steps of:
acquiring output torque of an engine, and calculating fresh air inflow of the engine;
the fresh air intake amount is subtracted from the total intake amount to calculate the first exhaust gas flow.
2. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 1, characterized in that the total intake air amount acquisition method is as follows:
and acquiring the pressure and the temperature of the intake manifold through a pressure temperature sensor, and calculating the total air inflow by combining an ideal gas equation.
3. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 1, characterized in that the total intake air amount acquisition method is as follows:
the known total intake air amount is obtained by querying the EMS system.
4. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 1, wherein said first exhaust gas flow rate is corrected to obtain a second exhaust gas flow rate.
5. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 4, characterized in that the specific method of obtaining the second exhaust gas flow rate by correction is as follows:
obtaining actual exhaust gas flow through bench calibration;
calculating a first exhaust gas flow;
integrating the difference value of the first exhaust gas flow and the actual exhaust gas flow to obtain an exhaust gas flow correction factor in unit time;
and adding an exhaust gas flow correction factor into the first exhaust gas flow calculation formula to obtain a second exhaust gas flow calculation model.
6. The exhaust gas flow rate calculation method according to claim 5, characterized in that the second exhaust gas flow rate calculation model includes a second exhaust gas flow rate calculation sub-model when the engine is driving the vehicle with pure oil under different conditions, and/or a second exhaust gas flow rate calculation sub-model when the engine is generating electricity, and/or a second exhaust gas flow rate calculation sub-model when the engine is driving the vehicle simultaneously with generating electricity.
7. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 1, characterized by calculating an engine fresh air intake amount by:
calibrating fresh air inflow, ignition angle, engine rotating speed, air-fuel ratio and actual output torque of the engine through a rack;
fitting the functional relation between the actual output torque of the engine and the fresh air inflow under different engine speeds, air-fuel ratios and ignition angles;
substituting the current engine output torque, the engine speed, the air-fuel ratio and the ignition angle into a functional relation to calculate the corresponding fresh air intake quantity.
8. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 1, characterized by obtaining a reference exhaust gas flow rate;
if the deviation of the reference exhaust gas flow and the first exhaust gas flow is larger than the threshold value, the high flow of the waste gas recirculation system is failed;
and if the deviation of the reference exhaust gas flow and the first exhaust gas flow is smaller than the threshold value, the low flow of the exhaust gas recirculation system is failed.
9. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 2, characterized by obtaining a reference exhaust gas flow rate;
if the deviation of the reference exhaust gas flow and the second exhaust gas flow is larger than the threshold value, the high flow of the waste gas recirculation system is failed;
and if the deviation of the reference exhaust gas flow and the second exhaust gas flow is smaller than the threshold value, the low flow of the exhaust gas recirculation system is failed.
10. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 8 or 9, characterized by the specific method of acquiring the reference exhaust gas flow rate as follows:
and the air pressure calculated by the exhaust back pressure model and the air pressure difference acquired by the intake pressure sensor are calculated and acquired.
11. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 8 or 9, characterized by the specific method of acquiring the reference exhaust gas flow rate as follows:
and adding actual measurement acquisition of a differential pressure sensor.
12. The exhaust gas flow rate calculation method of an exhaust gas recirculation system according to claim 8 or 9, characterized by the specific method of acquiring the reference exhaust gas flow rate as follows:
and adding an air sensor in the air inlet manifold to acquire oxygen flow and reference exhaust gas flow.
13. An exhaust gas flow calculation device of an exhaust gas recirculation system, characterized by comprising: the system comprises a fresh air inflow acquisition module, a total air inflow acquisition module and an exhaust gas flow calculation module;
the fresh air intake air amount acquisition module calculates fresh air intake air amount of the engine according to output torque of the engine;
the total air inflow acquisition module acquires the total air inflow of an air inlet manifold;
the exhaust gas flow calculating module calculates a first exhaust gas flow by subtracting the fresh air inflow from the total air inflow.
14. The exhaust gas flow calculation apparatus of an exhaust gas recirculation system according to claim 13, further comprising: and the correction module is used for correcting the first exhaust gas flow to calculate and acquire the second exhaust gas flow.
15. A storage medium having stored thereon instructions, the processor being loaded to perform the exhaust gas flow calculation method of the exhaust gas recirculation system of any one of claims 1 to 12.
16. An ECU comprising the exhaust gas flow rate calculation device of the exhaust gas recirculation system according to claim 13 or 14, and/or the storage medium according to claim 15.
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| CN202311679179.3A CN117869089A (en) | 2023-12-08 | 2023-12-08 | Exhaust gas flow calculation method and device of exhaust gas recirculation system, medium and ECU |
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| CN202311679179.3A CN117869089A (en) | 2023-12-08 | 2023-12-08 | Exhaust gas flow calculation method and device of exhaust gas recirculation system, medium and ECU |
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