CN114738135B - Gas flow reaction time calculation method, device, equipment and readable storage medium - Google Patents

Gas flow reaction time calculation method, device, equipment and readable storage medium Download PDF

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CN114738135B
CN114738135B CN202210303455.5A CN202210303455A CN114738135B CN 114738135 B CN114738135 B CN 114738135B CN 202210303455 A CN202210303455 A CN 202210303455A CN 114738135 B CN114738135 B CN 114738135B
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reaction time
gas flow
flow reaction
engine
working condition
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CN114738135A (en
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秦龙
岳永召
王冬
彭红涛
张凡武
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Dongfeng Motor Corp
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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
    • F02D41/0002—Controlling intake air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
    • F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
    • 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
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1473—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the regulation method
    • F02D41/1475—Regulating the air fuel ratio at a value other than stoichiometry
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/2406—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using essentially read only memories
    • F02D41/2425—Particular ways of programming the data
    • 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
    • F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
    • F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P5/00—Advancing or retarding ignition; Control therefor
    • F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
    • F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
    • 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)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention provides a method, a device and equipment for calculating gas flow reaction time and a readable storage medium, wherein the method for calculating the gas flow reaction time comprises the following steps: calculating to obtain the gas flow reaction time under the steady-state working condition; calculating to obtain the gas flow reaction time under the transient working condition; if the engine parts are in an aging working condition, obtaining the whole gas flow reaction time through correction calculation; and if the engine parts are not in the aging working condition, summing the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition to obtain the whole gas flow reaction time. According to the method, the whole gas flow reaction time is divided into a steady state working condition and a transient state working condition, whether parts of the engine are in an aging working condition or not is judged, if yes, correction calculation is carried out on the whole gas flow reaction time, and if not, summation calculation is carried out on the two working conditions, so that the calculated whole gas flow reaction time is more accurate.

Description

Gas flow reaction time calculation method, device, equipment and readable storage medium
Technical Field
The invention relates to the field of engine air inlet control, in particular to a method, a device and equipment for calculating gas flow reaction time and a readable storage medium.
Background
The gas flow reaction time is specifically to calculate the flow time of gas flow from a throttle valve to a cylinder under different working conditions, an engine intake system transmits atmospheric gas to the cylinder, the air intake system of the engine bends complicated and the operating conditions of the engine change suddenly, so that the gas flow control response of the engine intake system is delayed, and the time required by fresh air entering the cylinder through the throttle valve is estimated.
In the prior published patent application publication No. CN111502846B, "a method for controlling gas circuit torque in idling of engine", which controls gas circuit torque in idling based on time constant, the gas flow reaction time is not accurately calculated.
Disclosure of Invention
The invention mainly aims to provide a method, a device and equipment for calculating gas flow reaction time and a readable storage medium, and aims to solve the technical problem that the calculation of the gas flow reaction time of an air inlet system of an engine at present is not accurate enough.
In a first aspect, the present invention provides a gas flow reaction time calculation method, including:
calculating to obtain the gas flow reaction time under the steady-state working condition;
calculating to obtain the gas flow reaction time under the transient working condition;
judging whether the engine parts are in an aging working condition or not;
if the engine parts are in an aging working condition, the whole gas flow reaction time is obtained through correction calculation based on the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition;
and if the engine parts are not in the aging working condition, summing the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition to obtain the whole gas flow reaction time.
Optionally, the obtaining of the gas flow reaction time under the steady-state condition by calculation includes:
calculating the gas flow reaction time under the steady-state working condition through a first formula, wherein the first formula is as follows:
Figure BDA0003563776450000021
wherein, t Base For the gas flow reaction time under said steady-state operating conditions, V Man Is the average gas volume, r, of the intake manifold between the throttle and each cylinder VolEff For current inflation efficiency, V cyl Is the volume of each cylinder, N is the number of engine cylinders, N is the engine speed, r VolEff ×V cyl Xn is the total gas volume entering the cylinder for 2 engine revolutions.
Optionally, the obtaining of the gas flow reaction time under the transient operating condition by calculation includes:
calculating the gas flow reaction time under the transient working condition through a second formula, wherein the second formula is as follows:
Figure BDA0003563776450000022
wherein, t Trans For the gas flow reaction time, V, under the transient operating conditions Man The average gas volume of the intake manifold between the throttle valve and each cylinder,
Figure BDA0003563776450000023
wherein gamma is the specific heat capacity of air,
Figure BDA0003563776450000024
for intake pressure p after throttle Man With the gas pressure p in front of the throttle valve preThr K (n, rho) is a correction coefficient determined based on the engine speed n and the density rho of the gas entering the cylinder, dV ThrDsrd The volume flow at the ideal throttle, according to the ideal gas state equation,
Figure BDA0003563776450000025
wherein p is preThr Is the gas pressure in front of the throttle valve dm Thr The gas flow before the throttle valve, R is the gas constant, T Port Is the gas temperature of the gas inlet, M isAverage molar mass of gas.
Optionally, the method for determining the correction coefficient k (n, rho) specifically includes:
detecting whether a pressurization control closed loop is in an activated state;
when the boost control closed loop is not in the active state, k (n, rho) = k 1 (n, rho) wherein k is 1 (n, rho) is determined from a first relational table of the calibrated number of engine revolutions n and the density rho of the gas entering the cylinder;
when the boost control closed loop is in an active state, k (n, rho) = k 2 (n, rho) wherein k 2 (n, rho) is determined from a second table of calibrated engine revolutions n versus density of gas entering the cylinder rho.
Optionally, the determining whether the engine component is in the aging condition includes:
whether preset conditions are met or not is detected, and the preset conditions comprise:
the water temperature of the engine exceeds the preset water temperature;
the running time of the engine exceeds the preset time;
the target air-fuel ratio is fixed;
the ignition efficiency is kept at an optimum level;
the rotating speed of the engine is kept stable;
completing activation of the oxygen sensor in front of the catalyst;
the running mileage of the engine exceeds the preset mileage;
the accelerator pedal opening change rate exceeds a preset change rate;
and when the conditions are met, judging that the engine parts are in an aging working condition, otherwise, judging that the engine parts are not in the aging working condition.
Optionally, if the engine component is in an aging condition, obtaining the overall gas flow reaction time by correction calculation based on the gas flow reaction time under the steady-state condition and the gas flow reaction time under the transient condition includes:
obtaining the reaction time of the change of the oxygen concentration by adjusting the target air-fuel ratio;
if the reaction time of the oxygen concentration change is greater than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 1 ；
If the reaction time of the oxygen concentration change is not more than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 2 ；
Where t is the overall gas flow response time, k (n, rho) is a correction factor determined based on the engine speed n and the gas density rho entering the cylinder, d 1 For a first predetermined correction factor, d 2 For the second preset correction coefficient, t (z) is the gas flow reaction time after the last self-learning update, and the gas flow reaction time t (0) = t Base +t Trans ，t Base Is the gas flow reaction time under the steady state condition, t Trans The gas flow reaction time under the transient working condition is delta T which is the delay response time and is obtained by the calibration of an engine pedestal,
Figure BDA0003563776450000031
cnt is the delayed ignition frequency of the engine, N is the number of cylinders of the engine, N is the rotating speed of the engine, and the delayed ignition frequency Cnt of the engine is determined according to a relation table of the calibrated rotating speed N of the engine and the density rho of gas entering the cylinders.
In a second aspect, the present invention also provides a gas flow reaction time calculation apparatus, including:
the first calculation module is used for calculating and obtaining the gas flow reaction time under the steady-state working condition;
the second calculation module is used for calculating and obtaining the gas flow reaction time under the transient working condition;
the judging module is used for judging whether the engine parts are in an aging working condition or not;
the third calculation module is used for obtaining the whole gas flow reaction time through correction calculation based on the gas flow reaction time under the steady state working condition and the gas flow reaction time under the transient working condition if the engine parts are under the aging working condition;
and the fourth calculation module is used for summing the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition to obtain the whole gas flow reaction time if the engine parts are not in the aging working condition.
Optionally, the third computing module is configured to:
obtaining the reaction time of the change of the oxygen concentration by adjusting the target air-fuel ratio;
if the reaction time of the oxygen concentration change is greater than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 1 ；
If the reaction time of the oxygen concentration change is not more than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 2 ；
Where t is the overall gas flow response time, k (n, rho) is a correction factor determined based on the engine speed n and the gas density rho entering the cylinder, d 1 For a first predetermined correction factor, d 2 For the second preset correction coefficient, t (z) is the gas flow reaction time after the last self-learning update, and the gas flow reaction time t (0) = t Base +t Trans ，t Base Is the gas flow reaction time under the steady state condition, t Trans The gas flow reaction time under the transient working condition is delta T which is the delay response time and is obtained by the calibration of an engine pedestal,
Figure BDA0003563776450000041
cnt is engine time delay ignitionAnd the number of times, wherein N is the number of engine cylinders, N is the engine speed, and the delayed ignition number Cnt of the engine is determined according to a relation table of the calibrated engine speed N and the density rho of gas entering the cylinder.
In a third aspect, the present invention also provides a gas flow reaction time calculation device, which includes a processor, a memory, and a gas flow reaction time calculation program stored on the memory and executable by the processor, wherein when the gas flow reaction time calculation program is executed by the processor, the steps of the gas flow reaction time calculation method as described above are implemented.
In a fourth aspect, the present invention further provides a readable storage medium, on which a gas flow reaction time calculation program is stored, wherein when the gas flow reaction time calculation program is executed by a processor, the steps of the gas flow reaction time calculation method as described above are realized.
In the invention, the gas flow reaction time under the steady-state working condition is obtained through calculation; calculating to obtain the gas flow reaction time under the transient working condition; judging whether the engine parts are in an aging working condition or not; if the engine parts are in an aging working condition, the whole gas flow reaction time is obtained through correction calculation based on the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition; and if the engine parts are not in the aging working condition, summing the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition to obtain the whole gas flow reaction time. According to the invention, firstly, the whole gas flow reaction time is divided into the gas flow reaction time under the two working conditions of the steady state and the transient state, whether the engine parts are in the aging working condition is further judged, when the engine parts are in the aging working condition, the whole gas flow reaction time is corrected and calculated based on the gas flow reaction time under the two working conditions of the steady state and the transient state, and when the engine parts are not in the aging working condition, the gas flow reaction time under the steady state working condition and the gas flow reaction time under the transient state working condition are summed and calculated to obtain the whole gas flow reaction time, so that the calculated whole gas flow reaction time is more accurate.
Drawings
FIG. 1 is a schematic diagram of a hardware configuration of an embodiment of a gas flow reaction time calculation apparatus according to the present invention;
FIG. 2 is a schematic flow chart illustrating a method for calculating a gas flow reaction time according to an embodiment of the present invention;
FIG. 3 is a functional block diagram of an embodiment of a gas flow response time calculation apparatus according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In a first aspect, an embodiment of the present invention provides a gas flow reaction time calculation apparatus.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of an embodiment of a gas flow reaction time calculation apparatus according to the present invention. In this embodiment of the present invention, the gas flow reaction time calculation device may include a processor 1001 (e.g., a Central Processing Unit, CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used for realizing connection communication among the components; the user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard); the network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WI-FI interface, WI-FI interface); the memory 1005 may be a Random Access Memory (RAM) or a non-volatile memory (non-volatile memory), such as a magnetic disk memory, and the memory 1005 may optionally be a storage device independent of the processor 1001. Those skilled in the art will appreciate that the hardware configuration depicted in FIG. 1 is not intended to be limiting of the present invention, and may include more or less components than those shown, or some components in combination, or a different arrangement of components.
With continued reference to fig. 1, the memory 1005 of fig. 1, which is one type of computer storage medium, may include an operating system, a network communication module, a user interface module, and a gas flow reaction time calculation program. The processor 1001 may call a gas flow reaction time calculation program stored in the memory 1005, and execute the gas flow reaction time calculation method provided by the embodiment of the present invention.
In a second aspect, an embodiment of the present invention provides a method for calculating a gas flow reaction time.
In order to more clearly show the gas flow reaction time calculation method provided in the embodiment of the present application, an application scenario of the gas flow reaction time calculation method provided in the embodiment of the present application is first introduced.
The gas flow reaction time calculation method provided by the embodiment of the application is applied to calculation of gas flow reaction time in an air inlet system of an engine, in order to accelerate a gas flow following effect and realize accurate power output, the target position of a throttle valve needs to be controlled according to the gas flow reaction time, and therefore quick response and stability of gas flow are realized.
In an embodiment, referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of a gas flow reaction time calculation method according to the present invention, as shown in fig. 2, the gas flow reaction time calculation method includes:
and S10, calculating to obtain the gas flow reaction time under the steady-state working condition.
In this embodiment, the entire gas flow reaction time is divided into two parts, i.e., a steady-state operating condition and a transient operating condition, and the gas flow reaction time under the steady-state operating condition is calculated as the gas flow reaction time of the substantially stable and unchangeable part.
And S20, calculating to obtain the gas flow reaction time under the transient working condition.
In this embodiment, the whole gas flow reaction time is divided into two parts, i.e., a steady-state working condition and a transient working condition, and the calculated gas flow reaction time under the transient working condition refers to the gas flow reaction time of the calculated change part.
And step S30, judging whether the engine parts are in an aging working condition or not.
In this embodiment, as the engine component ages, the overall gas flow reaction time is affected to some extent, and here, whether the engine component is in an aging condition is determined.
And S40, if the engine parts are in an aging working condition, obtaining the whole gas flow reaction time through correction calculation based on the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition.
In this embodiment, the engine components and parts are in the aging condition, and will cause certain influence to the whole gas flow reaction time, so need to carry out correction calculation to the whole gas flow reaction time to make the calculation of whole gas flow reaction time more accurate.
And S50, if the engine parts are not in the aging working condition, summing the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition to obtain the whole gas flow reaction time.
In this embodiment, if the parts of the engine are not aged, correction calculation is not required, and the gas flow reaction time under the steady-state condition and the gas flow reaction time under the transient condition are summed to obtain the overall gas flow reaction time.
In the embodiment, the whole gas flow reaction time is divided into two parts under a steady state working condition and a transient working condition, the part with the transient change of the gas flow reaction time is also concerned besides the part with the basically stable steady state gas flow reaction time, the gas flow reaction times of the two parts are respectively calculated, and further, the influence on the whole gas flow reaction time along with the aging of parts of the engine is considered, so whether the parts of the engine are in the aging working condition or not is judged, if yes, the whole gas flow reaction time is corrected and calculated based on the gas flow reaction time under the steady state working condition and the transient working condition, if not, the gas flow reaction time under the steady state working condition and the gas flow reaction time under the transient working condition are summed to obtain the whole gas flow reaction time, and therefore, the calculated whole gas flow reaction time can be more accurate.
Further, in an embodiment, the step S10 includes:
calculating the gas flow reaction time under the steady-state working condition through a first formula, wherein the first formula is as follows:
Figure BDA0003563776450000081
wherein, t Base For the gas flow reaction time under said steady-state operating conditions, V Man Is the average gas volume, r, of the intake manifold between the throttle and the respective cylinders VolEff For current inflation efficiency, V cyl Is the volume of each cylinder, N is the number of engine cylinders, N is the engine speed, r VolEff ×V cyl Xn is the total gas volume entering the cylinder for 2 engine revolutions.
In this embodiment, the gas flow reaction time under the steady-state condition is the substantially stable gas flow reaction time, and the volume of the gas flowing through the gas intake system under this condition is kept consistent with the volume of the gas entering the cylinder. Each time the engine rotates for 2 circles, all cylinders complete one air intake, so r is VolEff ×V cyl Xn is the total gas volume entering the cylinder for 2 engine revolutions,
Figure BDA0003563776450000082
for a gas volume entering the cylinder per 1 revolution of the engine,
Figure BDA0003563776450000083
for the volume of gas entering the cylinder per second, there are
Figure BDA0003563776450000084
The time required for the gas to enter the cylinder from the throttle valve.
Further, in an embodiment, the step S20 includes:
calculating the gas flow reaction time under the transient working condition through a second formula, wherein the second formula is as follows:
Figure BDA0003563776450000085
wherein, t Trans For the gas flow reaction time under the transient operating conditions, V Man The average gas volume of the intake manifold between the throttle valve and each cylinder,
Figure BDA0003563776450000086
wherein gamma is the specific heat capacity of air,
Figure BDA0003563776450000087
for intake pressure p after throttle Man With the gas pressure p in front of the throttle preThr K (n, rho) is a correction factor, dV, determined based on the engine speed n and the density rho of the gas entering the cylinder ThrDsrd The volume flow at the ideal throttle, according to the ideal gas state equation,
Figure BDA0003563776450000088
wherein p is preThr Is the gas pressure in front of the throttle valve dm Thr The gas flow before the throttle valve, R is the gas constant, T Port M is the average molar mass of the gas, the gas temperature at the gas inlet.
In this embodiment, the volume flow at the ideal throttle valve is first calculated according to the ideal gas state equation, then the corrected volume flow at the throttle valve is obtained through correction calculation, and the gas flow reaction time under the transient operating condition is obtained based on the ratio of the average gas volume of the intake manifold between the throttle valve and each cylinder to the corrected volume flow at the throttle valve.
Further, in an embodiment, the method for determining the correction coefficient k (n, rho) in step S20 specifically includes:
detecting whether a pressurization control closed loop is in an activated state;
when the boost control closed loop is not in the active state, k (n, rho) = k 1 (n, rho) wherein k is 1 (n, rho) is determined from a first relational table of the calibrated number of engine revolutions n and the density rho of the gas entering the cylinder;
when the boost control closed loop is in an active state, k (n, rho) = k 2 (n, rho) wherein k is 2 (n, rho) is determined from a second table of calibrated engine revolutions n versus cylinder entering gas density rho.
In the embodiment, experiments show that when the supercharging control closed loop is activated rather than the supercharging control is not activated, the gas reaction time is relatively quick, which is caused by the better gas quantity following effect caused by the supercharging closed loop adjustment, the correction coefficient k (n, rho) of the supercharging control closed loop in the activated and inactivated states is calibrated according to tests to be used for calculating the gas flow reaction time under the transient working condition, the first relation table of the calibrated engine revolution number n and the gas density rho entering the cylinder is shown in table 1, and the table 1 is the first calibration relation table of the engine revolution number n and the gas density rho entering the cylinder.
Table 1.
Figure BDA0003563776450000091
Second relation table of the calibrated number of engine revolutions n and the density rho of gas entering the cylinder referring to table 2, table 2 is a second relation table of the engine revolutions n and the density rho of gas entering the cylinder.
Table 2.
Figure BDA0003563776450000092
Figure BDA0003563776450000101
Further, in an embodiment, the step S30 includes:
whether preset conditions are met or not is detected, and the preset conditions comprise:
the water temperature of the engine exceeds the preset water temperature;
the running time of the engine exceeds the preset time;
the target air-fuel ratio is fixed;
the ignition efficiency is kept at an optimal level;
the rotating speed of the engine is kept stable;
completing the activation of the oxygen sensor in front of the catalytic converter;
the running mileage of the engine exceeds the preset mileage;
the accelerator pedal opening change rate exceeds a preset change rate;
and when the conditions are met, judging that the engine parts are in an aging working condition, otherwise, judging that the engine parts are not in the aging working condition.
In the embodiment, the data information of each relevant parameter in the above determination conditions is acquired, and whether the engine component is in the aging working condition is determined, in the embodiment, the preset water temperature is 50 ℃, the preset time is 80S, the ignition efficiency is 1, the determination criterion for keeping the engine rotation speed stable is that the fluctuation range of the engine rotation speed does not exceed ± 10rpm, the preset mileage is set for optimizing the gas flow reaction time in the embodiment, the condition that the running mileage exceeds the preset mileage again after the running mileage is cleared after the preset mileage is reached is included, and the preset change rate is 20%/0.1S in the embodiment.
Further, in an embodiment, the step S40 includes:
obtaining the reaction time of the change of the oxygen concentration by adjusting the target air-fuel ratio;
if the reaction time of the oxygen concentration change is more than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the reaction is carried out on the whole gas flow of the next driving cycleAnd (3) correcting and calculating the time, wherein the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 1 ；
If the reaction time of the oxygen concentration change is not more than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 2 ；
Where t is the overall gas flow response time, k (n, rho) is a correction factor determined based on the engine speed n and the gas density rho entering the cylinder, d 1 For a first predetermined correction factor, d 2 For the second preset correction coefficient, t (z) is the gas flow reaction time after the last self-learning update, and the gas flow reaction time t (0) = t Base +t Trans ，t Base Is the gas flow reaction time under the steady state condition, t Trans The gas flow reaction time under the transient working condition is delta T which is the delay response time and is obtained by the calibration of an engine pedestal,
Figure BDA0003563776450000111
cnt is the delayed ignition frequency of the engine, N is the number of cylinders of the engine, N is the rotating speed of the engine, and the delayed ignition frequency Cnt of the engine is determined according to a relation table of the calibrated rotating speed N of the engine and the density rho of gas entering the cylinders.
In this embodiment, the target air-fuel ratio is adjusted to obtain the reaction time of the change in the oxygen concentration, and the preset driving cycle number takes 100 times. In the embodiment, the whole gas flow reaction time is corrected and calculated according to the aging condition of the engine parts under two conditions, when the reaction time of the oxygen concentration change is greater than T (z) + Δ T, a first preset correction coefficient is used for correcting and calculating to obtain a value of 1.02, the problem that the whole gas flow reaction time is prolonged due to the aging of the parts is solved, when the reaction time of the oxygen concentration change is not greater than T (z) + Δ T, a second preset correction coefficient is used for correcting and calculating to obtain a value of 0.97, and the problem that the whole gas flow reaction time is shortened due to the aging of the parts is solved.
In this embodiment, the engine delayed ignition times Cnt refer to table 3 according to a relationship table between the calibrated engine speed n and the gas density rho entering the cylinder, and table 3 is a calibration relationship table between the engine delayed ignition times Cnt, the engine speed n and the gas density rho entering the cylinder.
Table 3.
Figure BDA0003563776450000112
In a third aspect, an embodiment of the present invention further provides a gas flow reaction time calculation apparatus.
Referring to fig. 3, fig. 3 is a functional module schematic diagram of a gas flow reaction time calculation apparatus according to an embodiment of the present invention.
In this embodiment, the gas flow reaction time calculation device includes:
the first calculation module 10 is used for calculating and obtaining the gas flow reaction time under the steady-state working condition;
the second calculation module 20 is used for calculating and obtaining the gas flow reaction time under the transient working condition;
the judging module 30 is used for judging whether the engine parts are in an aging working condition or not;
the third calculation module 40 is configured to obtain an overall gas flow reaction time through correction calculation based on the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition if the engine component is in the aging working condition;
and the fourth calculation module 50 is configured to sum the gas flow reaction time under the steady-state condition and the gas flow reaction time under the transient condition to obtain an overall gas flow reaction time if the engine component is not in the aging condition.
Further, in an embodiment, the first calculating module 10 is configured to:
calculating the gas flow reaction time under the steady-state working condition through a first formula, wherein the first formula is as follows:
Figure BDA0003563776450000121
wherein, t Base For the gas flow reaction time, V, under the steady-state operating conditions Man Is the average gas volume, r, of the intake manifold between the throttle and the respective cylinders VolEff For current inflation efficiency, V cyl Is the volume of each cylinder, N is the number of engine cylinders, N is the engine speed, r VolEff ×V cyl Xn is the total gas volume entering the cylinder for 2 engine revolutions.
Further, in an embodiment, the second calculating module 20 is configured to:
calculating the gas flow reaction time under the transient working condition through a second formula, wherein the second formula is as follows:
Figure BDA0003563776450000122
wherein, t Trans For the gas flow reaction time under the transient operating conditions, V Man The average gas volume of the intake manifold between the throttle valve and each cylinder,
Figure BDA0003563776450000123
wherein gamma is the specific heat capacity of air,
Figure BDA0003563776450000124
for the inlet pressure p after the throttle Man With the gas pressure p in front of the throttle preThr K (n, rho) is a correction coefficient determined based on the engine speed n and the density rho of the gas entering the cylinder, dV ThrDsrd The volume flow at the ideal throttle, according to the ideal gas state equation,
Figure BDA0003563776450000125
wherein p is preThr Is the gas pressure in front of the throttle valve dm Thr In front of the throttle valveGas flow rate, R is gas constant, T Port M is the average molar mass of the gas, the gas temperature at the gas inlet.
Further, in an embodiment, the second calculating module 20 further includes a determining module 201, configured to:
detecting whether a pressurization control closed loop is in an activated state;
when the boost control closed loop is not in the active state, k (n, rho) = k 1 (n, rho) wherein k is 1 (n, rho) is determined according to a first relation table of the calibrated engine revolution n and the density rho of gas entering a cylinder;
when the boost control closed loop is in an active state, k (n, rho) = k 2 (n, rho) wherein k is 2 (n, rho) is determined from a second table of calibrated engine revolutions n versus density of gas entering the cylinder rho.
Further, in an embodiment, the determining module 30 is configured to:
whether preset conditions are met or not is detected, and the preset conditions comprise:
the water temperature of the engine exceeds the preset water temperature;
the running time of the engine exceeds the preset time;
the target air-fuel ratio is fixed;
the ignition efficiency is kept at an optimum level;
the rotating speed of the engine is kept stable;
completing the activation of the oxygen sensor in front of the catalytic converter;
the running mileage of the engine exceeds the preset mileage;
the accelerator pedal opening change rate exceeds a preset change rate;
and when the conditions are met, judging that the engine parts are in an aging working condition, otherwise, judging that the engine parts are not in the aging working condition.
Further, in an embodiment, the third calculating module 40 is configured to:
obtaining the reaction time of the change of the oxygen concentration by adjusting the target air-fuel ratio;
if the reaction time for the change in oxygen concentration is longer thanT (z) + Δ T, and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 1 ；
If the reaction time of the oxygen concentration change is not more than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 2 ；
Where t is the overall gas flow response time, k (n, rho) is a correction factor determined based on the engine speed n and the gas density rho entering the cylinder, d 1 For a first predetermined correction factor, d 2 For the second preset correction coefficient, t (z) is the gas flow reaction time after the last self-learning update, and the gas flow reaction time t (0) = t of the first update Base +t Trans ，t Base Is the gas flow reaction time, t, under the steady-state operating condition Trans The gas flow reaction time under the transient working condition is delta T which is the delay response time and is obtained by the calibration of an engine pedestal,
Figure BDA0003563776450000141
cnt is the delayed ignition frequency of the engine, N is the number of cylinders of the engine, N is the rotating speed of the engine, and the delayed ignition frequency Cnt of the engine is determined according to a relation table of the calibrated rotating speed N of the engine and the density rho of gas entering the cylinders.
The function implementation of each module in the gas flow reaction time calculation apparatus corresponds to each step in the gas flow reaction time calculation method embodiment, and the function and implementation process thereof are not described in detail here.
In a fourth aspect, the embodiment of the present invention further provides a readable storage medium.
The readable storage medium of the present invention stores a gas flow reaction time calculation program, wherein the gas flow reaction time calculation program, when executed by a processor, implements the steps of the gas flow reaction time calculation method as described above.
The method implemented when the gas flow reaction time calculation program is executed may refer to various embodiments of the gas flow reaction time calculation method of the present invention, and details thereof are not repeated herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium (e.g., ROM/RAM, magnetic disk, optical disk) as described above and includes instructions for causing a terminal device to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.

Claims (6)

1. A gas flow reaction time calculation method is characterized by comprising the following steps:
calculating to obtain gas flow reaction time under a steady-state working condition, wherein the gas flow reaction time is the time for gas to reach a cylinder from a throttle valve;
calculating to obtain the gas flow reaction time under the transient working condition;
judging whether the engine parts are in an aging working condition or not;
if the engine parts are in an aging working condition, the whole gas flow reaction time is obtained through correction calculation based on the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition;
if the engine parts are not in the aging working condition, summing the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition to obtain the whole gas flow reaction time;
the gas flow reaction time under the transient working condition obtained through calculation comprises the following steps:
calculating the gas flow reaction time under the transient working condition through a second formula, wherein the second formula is as follows:
Figure FDA0003992209510000011
wherein, t Trans For the gas flow reaction time under the transient operating conditions, V Man Is the average gas volume of the intake manifold between the throttle and each cylinder, where dV Thr For corrected volume flow at the throttle, dV Thr The calculation formula of (2) is as follows:
Figure FDA0003992209510000012
wherein gamma is the specific heat capacity of air,
Figure FDA0003992209510000013
for the inlet pressure p after the throttle Man In front of throttle valveGas pressure p preThr K (n, rho) is a correction factor, dV, determined based on the engine speed n and the density rho of the gas entering the cylinder ThrDsrd The volume flow at the ideal throttle, according to the ideal gas state equation,
Figure FDA0003992209510000014
wherein p is preThr Is the gas pressure in front of the throttle valve dm Thr The gas flow before the throttle valve, R is the gas constant, T Port Is the gas temperature at the gas inlet, M is the average molar mass of the gas;
the judging whether the engine parts are in the aging working condition comprises the following steps:
whether preset conditions are met or not is detected, and the preset conditions comprise:
the water temperature of the engine exceeds the preset water temperature;
the running time of the engine exceeds the preset time;
the target air-fuel ratio is fixed;
the ignition efficiency is kept at an optimum level;
the rotating speed of the engine is kept stable;
completing the activation of the oxygen sensor in front of the catalytic converter;
the running mileage of the engine exceeds the preset mileage;
the accelerator pedal opening change rate exceeds a preset change rate;
when the conditions are met, judging that the engine parts are in an aging working condition, otherwise, judging that the engine parts are not in the aging working condition;
if the engine parts are in an aging working condition, obtaining the whole gas flow reaction time through correction calculation based on the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition comprises the following steps:
obtaining the reaction time of the change of the oxygen concentration by adjusting the target air-fuel ratio;
if the reaction time of the oxygen concentration change is more than T (z) + delta T and the driving cycle number exceeds the preset driving cycle numberAnd correcting and calculating the whole gas flow reaction time of the next driving cycle, wherein the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 1 ；
If the reaction time of the oxygen concentration change is not more than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 2 ；
Where t is the overall gas flow response time, k (n, rho) is a correction factor determined based on the engine speed n and the gas density rho entering the cylinder, d 1 For a first predetermined correction factor, d 2 For the second preset correction coefficient, t (z) is the gas flow reaction time after the last self-learning update, and the gas flow reaction time t (0) = t Base +t Trans ，t Base Is the gas flow reaction time under the steady state condition, t Trans The gas flow reaction time under the transient working condition is delta T which is the delay response time and is obtained by the calibration of an engine pedestal,
Figure FDA0003992209510000021
cnt is the delayed ignition frequency of the engine, N is the number of cylinders of the engine, N is the rotating speed of the engine, and the delayed ignition frequency Cnt of the engine is determined according to a relation table of the calibrated rotating speed N of the engine and the density rho of gas entering the cylinders.
2. The method of claim 1, wherein the calculating the gas flow reaction time under the steady state condition comprises:
calculating the gas flow reaction time under the steady-state working condition through a first formula, wherein the first formula is as follows:
Figure FDA0003992209510000031
wherein, t Base Is the gas flow under the steady state conditionReaction time, V Man Is the average gas volume, r, of the intake manifold between the throttle and each cylinder VolEff For current inflation efficiency, V cyl Is the volume of each cylinder, N is the number of engine cylinders, N is the engine speed, r VolEff ×V cyl Xn is the total gas volume entering the cylinder for 2 engine revolutions.
3. The method for calculating gas flow reaction time according to claim 1, wherein the determination method of the correction coefficient k (n, rho) is specifically:
detecting whether a pressurization control closed loop is in an activated state;
when the boost control closed loop is not in the active state, k (n, rho) = k 1 (n, rho) wherein k is 1 (n, rho) is determined according to a first relation table of the calibrated engine revolution n and the density rho of gas entering a cylinder;
when the boost control closed loop is in an active state, k (n, rho) = k 2 (n, rho) wherein k is 2 (n, rho) is determined from a second table of calibrated engine revolutions n versus cylinder entering gas density rho.
4. A gas flow reaction time calculation device, characterized by comprising:
the first calculation module is used for obtaining gas flow reaction time under a steady-state working condition through calculation, wherein the gas flow reaction time is the time when gas reaches an air cylinder from a throttle valve;
the second calculation module is used for calculating the gas flow reaction time under the transient working condition;
the judging module is used for judging whether the engine parts are in an aging working condition or not;
the third calculation module is used for obtaining the whole gas flow reaction time through correction calculation based on the gas flow reaction time under the steady state working condition and the gas flow reaction time under the transient working condition if the engine parts are under the aging working condition;
the fourth calculation module is used for summing the gas flow reaction time under the steady-state working condition and the gas flow reaction time under the transient working condition to obtain the whole gas flow reaction time if the engine parts are not in the aging working condition;
the second calculation module is further configured to calculate, by using a second formula, a gas flow reaction time under the transient working condition, where the second formula is:
Figure FDA0003992209510000032
wherein, t Trans For the gas flow reaction time under the transient operating conditions, V Man Is the average gas volume of the intake manifold between the throttle and the respective cylinders, where dV Thr For corrected volume flow at the throttle, dV Thr The calculation formula of (2) is as follows:
Figure FDA0003992209510000041
wherein gamma is the specific heat capacity of air,
Figure FDA0003992209510000042
for the inlet pressure p after the throttle Man With the gas pressure p in front of the throttle preThr K (n, rho) is a correction coefficient determined based on the engine speed n and the density rho of the gas entering the cylinder, dV ThrDsrd The volume flow at the ideal throttle, according to the ideal gas state equation,
Figure FDA0003992209510000043
wherein p is preThr Is the gas pressure in front of the throttle valve dm Thr The gas flow before the throttle valve, R is the gas constant, T Port Is the gas temperature at the gas inlet, M is the average molar mass of the gas;
the judging module is further used for detecting whether preset conditions are met, and the preset conditions comprise:
the water temperature of the engine exceeds the preset water temperature;
the running time of the engine exceeds the preset time;
the target air-fuel ratio is fixed;
the ignition efficiency is kept at an optimal level;
the rotating speed of the engine is kept stable;
completing activation of the oxygen sensor in front of the catalyst;
the running mileage of the engine exceeds the preset mileage;
the accelerator pedal opening change rate exceeds a preset change rate;
when the conditions are met, judging that the engine parts are in an aging working condition, otherwise, judging that the engine parts are not in the aging working condition;
the third computing module is further configured to:
obtaining the reaction time of the change of the oxygen concentration by adjusting the target air-fuel ratio;
if the reaction time of the oxygen concentration change is greater than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 1 ；
If the reaction time of the oxygen concentration change is not more than T (z) + delta T and the driving cycle number exceeds the preset driving cycle number, the whole gas flow reaction time of the next driving cycle is corrected and calculated, and the calculation formula is as follows: t = T (z) + k (n, rho) × Δ T × d 2 ；
Where t is the overall gas flow reaction time, k (n, rho) is a correction factor determined based on engine speed n and gas density rho entering the cylinder, d 1 For a first predetermined correction factor, d 2 For the second preset correction coefficient, t (z) is the gas flow reaction time after the last self-learning update, and the gas flow reaction time t (0) = t of the first update Base +t Trans ，t Base Is the gas flow reaction time, t, under the steady-state operating condition Trans For gas flow reversal under said transient conditionsThe response time, delta T is the delay response time, is obtained by the calibration of an engine pedestal,
Figure FDA0003992209510000051
cnt is the delayed ignition frequency of the engine, N is the number of cylinders of the engine, N is the rotating speed of the engine, and the delayed ignition frequency Cnt of the engine is determined according to a relation table of the calibrated rotating speed N of the engine and the density rho of gas entering the cylinders.
5. A gas flow reaction time calculation apparatus characterized by comprising a processor, a memory, and a gas flow reaction time calculation program stored on the memory and executable by the processor, wherein the gas flow reaction time calculation program, when executed by the processor, realizes the steps of the gas flow reaction time calculation method according to any one of claims 1 to 3.
6. A readable storage medium, characterized in that a gas flow reaction time calculation program is stored thereon, wherein the gas flow reaction time calculation program, when executed by a processor, implements the steps of the gas flow reaction time calculation method according to any one of claims 1 to 3.
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