CN111412071A - EGR rate calculation method and device, vehicle-mounted terminal and storage medium - Google Patents

EGR rate calculation method and device, vehicle-mounted terminal and storage medium Download PDF

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CN111412071A
CN111412071A CN202010105810.9A CN202010105810A CN111412071A CN 111412071 A CN111412071 A CN 111412071A CN 202010105810 A CN202010105810 A CN 202010105810A CN 111412071 A CN111412071 A CN 111412071A
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egr rate
gas
intake manifold
mixing cavity
current period
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CN111412071B (en
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郑良辰
钱鹏飞
刘义强
金昶明
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Zhejiang Geely Holding Group Co Ltd
Yiwu Geely Powertrain Co Ltd
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Zhejiang Geely Holding Group Co Ltd
Yiwu Geely Powertrain Co Ltd
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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
    • F02D2200/04—Engine intake system parameters
    • 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
    • F02D2200/06—Fuel or fuel supply system parameters

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses a method and a device for calculating an EGR (exhaust gas recirculation) rate, a vehicle-mounted terminal and a storage medium, wherein the method comprises the following steps: acquiring the gas flow entering an intake manifold through a throttle valve, a carbon tank and a crankshaft ventilation box in the current period; according to the gas flow passing through the throttle valve, the gas flow entering the intake manifold from the carbon tank and the gas flow entering the intake manifold from the crankshaft ventilation box, the EGR rate of the gas passing through the throttle valve, the EGR rate of the gas entering the intake manifold from the carbon tank and the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box are obtained; acquiring the EGR rate of the mixing cavity in the previous period and the calculation step length of the EGR rate of the mixing cavity in the current period; according to the EGR rate of the gas passing through the throttle valve, the EGR rate of the gas entering the intake manifold from the carbon tank, the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box, the EGR rate of the mixing cavity in the previous period and the calculation step length, the EGR rate of the mixing cavity in the current period is obtained, the accurate EGR rate can be obtained quickly, and the failure of prediction is avoided.

Description

EGR rate calculation method and device, vehicle-mounted terminal and storage medium
Technical Field
The invention relates to the technical field of vehicles, in particular to a method and a device for calculating an EGR rate, a vehicle-mounted terminal and a storage medium.
Background
In the background of the demand for increased fuel consumption of gasoline engines, the low pressure exhaust gas recirculation (L P-EGR) technology is considered as one of the methods with feasibility for reducing fuel consumption, and when the L P-EGR technology is used, the EGR rate needs to be accurately controlled, otherwise, a series of problems such as fire, pre-ignition, inaccurate air-fuel ratio control, and failure to achieve the expected fuel consumption are caused.
When L P-EGR closed-loop control is carried out, a real EGR rate needs to be obtained, the real EGR rate is compared with a target EGR rate in real time for closed-loop control, so accurate real EGR rate feedback needs to be obtained, and because no sensor which can directly measure the EGR rate is available on the market, the EGR rate can only be predicted, and the accuracy and the real-time performance of EGR prediction need to be ensured when the EGR rate is predicted.
According to the configuration condition of an engine, the mixing point of exhaust gas and fresh air in the engine is a position formed by the initial EGR rate before a compressor, and the exhaust gas and the fresh air enter a cylinder through a throttle valve after passing through the compressor for combustion.
The traditional Runge Kutta method predicts the EGR, and forms a new EGR rate with newly imported waste gas and fresh air according to the EGR rate at the last moment of a mixing point, at the moment, the Runge Kutta method can be used for predicting the EGR rate at the next moment according to a required set step length, and when the rotating speed of an engine is very fast or the volume of a mixing cavity is very small, a final result cannot be obtained in time, so that the timeliness of EGR rate prediction is reduced.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a method and an apparatus for calculating an EGR rate, a vehicle-mounted terminal, and a storage medium, which can solve the problem of the prior art that the performance of a vehicle is degraded due to a delay in calculating the EGR rate.
In order to solve the technical problems, the specific technical scheme of the invention is as follows:
in one aspect, the present invention provides a method of calculating an EGR rate, the method comprising the steps of:
acquiring the gas flow entering an intake manifold through a throttle valve, the gas flow entering the intake manifold through a carbon tank and the gas flow entering the intake manifold through a crankshaft ventilation box in the current period, wherein the gas flow comprises the exhaust gas flow and the air flow;
according to the gas flow passing through the throttle valve, the gas flow entering the intake manifold from the carbon tank and the gas flow entering the intake manifold from the crankshaft ventilation box, the EGR rate of the gas passing through the throttle valve, the EGR rate of the gas entering the intake manifold from the carbon tank and the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box are obtained;
acquiring the EGR rate of the mixing cavity in the previous period and the calculation step length of the EGR rate of the mixing cavity in the current period;
and acquiring the calculation step length of the EGR rate of the mixing cavity according to the EGR rate of the throttle gas, the EGR rate of the gas entering the intake manifold from the carbon tank, the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box, the EGR rate of the mixing cavity in the previous period and the current period, and acquiring the EGR rate of the mixing cavity in the current period.
Further, the step of calculating the mixture chamber EGR rate in the last period and the mixture chamber EGR rate in the current period comprises:
acquiring the EGR rate of the mixing cavity in the previous period, the total mass of gas in the instantaneous mixing cavity and the flow rate of gas flowing through the instantaneous mixing cavity;
acquiring the gas outflow time of the mixing chamber in the current period according to the total mass of the gas in the instantaneous mixing chamber and the flow rate of the gas flowing through the instantaneous mixing chamber;
judging whether the gas outflow time of the mixing cavity in the current period is greater than the preset time or not;
if so, taking the preset time as the current period to obtain the calculation step length of the EGR rate of the mixing cavity, and if not, taking the gas outflow time of the mixing cavity in the current period as the current period to obtain the calculation step length of the EGR rate of the mixing cavity.
Further, the obtaining the current period mixing chamber EGR rate according to the calculated step length of the mixing chamber EGR rate obtained through the EGR rate of the throttle gas, the EGR rate of the carbon canister entering the intake manifold, the EGR rate of the crank ventilation box entering the intake manifold, the EGR rate of the mixing chamber in the previous period and the current period comprises:
obtaining the EGR rate of the mixing cavity in the current period according to the formula (1):
y(i+1)＝y(i)+h*(b1*K1+b2*K2+b3*K3+b4*K4) (1)
wherein: y is(i)For the last cycle mixing chamber EGR rate, y(i+1)Mixing chamber EGR rate for the current cycle, b1、b2、b3And b4Is a predetermined coefficient, K1、K2、K3And K4And h is a calculation step length for acquiring the EGR rate of the mixing cavity in the current period.
Further, said K1Obtained by the formula (2), said K2Obtained by the formula (3), said K3Obtained by the formula (4) and said K4Obtained by equation (5):
Figure BDA0002387692890000021
Figure BDA0002387692890000022
Figure BDA0002387692890000031
Figure BDA0002387692890000032
wherein: a is the gas flow passing through the throttle valve, B is the gas flow entering the intake manifold from the carbon tank, C is the gas flow entering the intake manifold from the crankshaft ventilation box, S is the total gas amount in the intake manifold in the current period, A(i+1)To pass the EGR rate of the throttle gas, B(i+1)EGR rate and C for canister intake manifold gas(i+1)The EGR rate of the crankcase ventilation gases entering the intake manifold.
In a second aspect, the present invention provides, on the basis of the method for calculating an EGR rate, an apparatus for calculating an EGR rate, the apparatus comprising:
the device comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the gas flow entering an intake manifold through a throttle valve, a carbon tank and a crankshaft ventilation box in the current period, and the gas flow comprises the exhaust gas flow and the air flow;
the first calculation module is used for acquiring the EGR rate of gas passing through the throttle valve, the EGR rate of gas entering the intake manifold from the carbon tank and the EGR rate of gas entering the intake manifold from the crankshaft ventilation box according to the gas flow passing through the throttle valve, the gas flow entering the intake manifold from the carbon tank and the gas flow entering the intake manifold from the crankshaft ventilation box;
the second acquisition module is used for acquiring the EGR rate of the mixing cavity in the previous period and the calculation step length of the EGR rate of the mixing cavity acquired in the current period;
and the second calculation module is used for acquiring the calculation step length of the EGR rate of the mixing cavity according to the EGR rate of the throttle gas, the EGR rate of the gas entering the intake manifold from the carbon tank, the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box, the EGR rate of the mixing cavity in the previous period and the current period, and acquiring the EGR rate of the mixing cavity in the current period.
Further, the second obtaining module includes:
the first acquisition unit is used for acquiring the EGR rate of the mixing cavity in the previous period;
the second acquisition unit is used for acquiring the total mass of the gas in the instantaneous mixing cavity and the flow rate of the gas flowing through the instantaneous mixing cavity;
and the judging unit is used for judging whether the gas outflow time of the mixing cavity in the current period is greater than the preset time, if so, taking the preset time as the calculation step length of the EGR rate of the mixing cavity in the current period, and if not, taking the gas outflow time of the mixing cavity in the current period as the calculation step length of the EGR rate of the mixing cavity in the current period.
Further, the second calculation module includes:
a first calculating unit, configured to obtain the EGR rate of the mixing chamber in the current period according to formula (1), where formula (1) is:
y(i+1)＝y(i)+h*(b1*K1+b2*K2+b3*K3+b4*K4)，
wherein: y is(i)For the last cycle mixing chamber EGR rate, y(i+1)Mixing chamber EGR rate for the current cycle, b1、b2、b3And b4Is a predetermined coefficient, K1、K2、K3And K4And h is a calculation step length for acquiring the EGR rate of the mixing cavity in the current period.
Further, the second calculation module further comprises:
a second calculation unit for calculating K according to formula (2)1The formula (2) is:
Figure BDA0002387692890000041
a third calculation unit for calculating K according to formula (3)2The formula (3) is:
Figure BDA0002387692890000042
a fourth calculating unit for calculating K according to formula (4)3The formula (4) is:
Figure BDA0002387692890000043
and
a fifth calculating unit for calculating and obtaining K according to formula (5)3The formula (5) is:
Figure BDA0002387692890000044
wherein: a is air passing through a throttle valveThe volume flow, B is the gas flow entering the intake manifold from the carbon tank, C is the gas flow entering the intake manifold from the crankshaft ventilation box, S is the total gas amount in the intake manifold in the current period, A(i+1)To pass the EGR rate of the throttle gas, B(i+1)EGR rate and C for canister intake manifold gas(i+1)The EGR rate of the crankcase ventilation gases entering the intake manifold.
In a third aspect, the present invention further provides a vehicle-mounted terminal, where the vehicle-mounted terminal includes a processor and a memory, where the memory stores one or more instructions, and the one or more instructions are adapted to load and execute the computer program by the processor to implement the steps of the method for calculating an EGR rate.
In a fourth aspect, the present invention further provides a storage medium having at least one instruction, at least one program, code set, or instruction set stored therein, which is loaded and executed by a processor to implement the steps of one of the EGR rate calculation methods described above.
By adopting the technical scheme, the method and the device for calculating the EGR rate, the vehicle-mounted terminal and the storage medium have the following beneficial effects that:
1. according to the method and the device for calculating the EGR rate, the vehicle-mounted terminal and the storage medium, the EGR rate in the previous period is substituted into the calculation of the EGR rate in the current period, and the accuracy of the calculation of the EGR rate is improved.
2. According to the method and the device for calculating the EGR rate, the vehicle-mounted terminal and the storage medium, the calculation of the EGR rate is closer to a final result by setting corresponding parameters, the calculation speed is higher, the delay of the calculation of the EGR rate is avoided, and the timeliness of the calculation of the EGR rate is ensured.
3. According to the method and the device for calculating the EGR rate, the vehicle-mounted terminal and the storage medium, when the gas flow rate of the engine is high or the gas volume of the mixing cavity is small, the calculation step length of the EGR rate of the mixing cavity obtained in the current period is limited, and the smooth calculation of the EGR rate is ensured.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a vehicle fuel line configuration in an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a system in an embodiment of the present description;
FIG. 3 is a flow chart illustrating a method of calculating EGR in an embodiment of the present disclosure;
fig. 4 is a detailed step diagram of step S3 in fig. 3;
FIG. 5 is a schematic diagram of a calculation device for EGR in the embodiment of the present description;
FIG. 6 is a schematic diagram of a second acquisition module of FIG. 5;
FIG. 7 is a schematic structural diagram of a vehicle-mounted terminal in an embodiment of the present specification;
FIG. 8 is a schematic diagram of a conventional Longge Kutta simulation in this specification;
FIG. 9 is a schematic diagram of an improved Longge Kutta simulation in this specification;
FIG. 10A volume of a mixing chamber in an embodiment of the present description is 2000cm3A simulation schematic diagram of (a);
FIG. 11A volume of a mixing chamber of 500cm in an example of the present specification3A simulation schematic diagram of (a);
FIG. 12A volume of a mixing chamber of an embodiment of the present specification is 100cm3A simulation schematic diagram of (a);
FIG. 13A volume of a mixing chamber of an embodiment of the present specification is 100cm3A simulation schematic of (a).
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Example 1
Referring to fig. 1, which is a schematic diagram of a fuel pipeline of a vehicle in the embodiment of the present disclosure, in order to reduce fuel consumption, an Exhaust Gas Recirculation (EGR) technology may be used, such as an EGR cooler and an EGR valve provided in fig. 1, and specifically, an EGR rate is generally calculated before a mixing point compressor, so as to adjust an amount of fuel injection, that is, an EGR rate of gas in a mixing chamber, where gas entering the mixing chamber mainly includes exhaust gas and fresh air entering through a throttle valve, fresh air entering an intake manifold through a carbon canister, and fresh air entering the intake manifold through a crank ventilation box, so that the EGR rate of gas in the mixing chamber is also greatly influenced by a difference in gas entering the mixing chamber through the above position.
As shown in fig. 2, a system provided for the embodiments of the present disclosure is capable of calculating or predicting an EGR rate of gas in a mixing chamber, and specifically, the system may include at least a vehicle-mounted terminal and a detection device, the vehicle-mounted terminal is in communication with the detection device, a plurality of detection units are disposed in the detection device, and the detection units interact with the vehicle-mounted terminal to obtain, in real time, a total amount of exhaust gas and fresh air entering through a throttle valve, fresh air entering through a carbon canister into an intake manifold, fresh air entering through a crank ventilation box into the intake manifold, and gas in the mixing chamber according to a request of the vehicle-mounted terminal.
The vehicle-mounted terminal may be a device fixedly configured by a vehicle, such as a vehicle running computer, a vehicle-mounted controller, and the like, or may be an entity device of a type, such as a smart phone, a desktop computer, a tablet computer, a notebook computer, a digital assistant, an intelligent wearable device, and the like, which is in communication connection with the vehicle.
The vehicle-mounted terminal can comprise a display screen, a storage device and a processor which are connected through a data bus. The display screen is used for displaying an operation interface or interacting with a user and the like, and the display screen can be a control screen in a vehicle, a touch screen of a mobile phone or a tablet computer and the like. The storage device is used for storing program codes, data materials and the like of the shooting device, and the storage device can be a memory of a vehicle-mounted terminal, and can also be a storage device such as a smart media card (smart media card), a secure digital card (secure card), a flash memory card (flash card) and the like. The processor may be a single core or multi-core processor.
In addition, the basis of calculation in the embodiment of the present specification is a conventional longgutta method, and the formula thereof is as follows:
y(i+1)＝y(i)+h*(c1*K1+c2*K2+c3*K3+c4*K4)
Figure BDA0002387692890000071
wherein c is1，c2，c3，c4，a2，a31，a32，a41，a42，a43，b21，b31，b32，b41，b42，b43For undetermined coefficients, Taylor expansion is carried out at the point x (i) to obtain a group of solutions after the power series of the step length h. In the traditional Longge Kuta method, a is taken2＝a3＝b21＝b32＝0.5，b31＝b41＝b42＝0，a4＝b43＝1，c1＝c4＝1/6,c2＝c3＝1/3。
When applied to EGR rate prediction, the term x (i) is absent, not requiring a2a3a4There is no need to determine the coefficients in the modified Longgustata method, where b21、b31、b32、b41、b42、b43、c1、c2、c3And c4The value of the specific special solution is set according to the actual requirement, for example, b can be taken21＝b31＝b32＝b41＝b42＝b43＝1，c1＝c2＝c3＝c4Another set of solutions is formed, 1/4. K for EGR rate prediction with the set of special solutions being entered2Based on K1Carry out the calculation of K3At K2，K1On the basis of (A) is calculated, K4Based on K3，K2，K1Carry out the calculation of K2，K3，K4The proportion of the previous step is higher when the respective slopes are calculated, and the final result can be more quickly approached by each calculation, so that the prediction speed is higher.
As shown in fig. 3, the method for calculating the EGR rate according to the embodiment of the present disclosure based on the above system can be applied to a method for calculating the EGR rate of a vehicle having an exhaust gas recirculation device.
Specifically, referring to fig. 3, which is a flow chart illustrating a method for calculating an EGR rate according to an embodiment of the present invention, the present specification provides the method operation steps as described in the embodiment or the flow chart, but based on the conventional method; or the inventive process may include additional or fewer steps. The step sequence recited in the embodiment is only one of the execution sequences of many steps, and does not represent the only execution sequence, and a method for calculating the EGR rate may be executed in the method sequence shown in the embodiment or the drawings. Specifically, as shown in fig. 3, the method includes:
s1: acquiring the gas flow entering an intake manifold through a throttle valve, the gas flow entering the intake manifold through a carbon tank and the gas flow entering the intake manifold through a crankshaft ventilation box in the current period, wherein the gas flow comprises the exhaust gas flow and the air flow;
it should be noted that the gas flow rate mentioned above can be measured by sensors disposed at corresponding positions, for example, pressure sensors are disposed on a throttle valve, a connection pipeline between the carbon canister and the intake manifold, and a connection pipeline between the crank ventilation box and the intake manifold, pressure information of gas in the pipeline is detected in real time by the pressure sensors, and corresponding gas flow rate can be obtained by combining time and parameters of the pipeline itself, in addition, the gas flow rate through the throttle valve actually includes exhaust gas flow rate and air flow rate, and the gas entering the intake manifold from the carbon canister and the crank ventilation box is fresh air.
S2: according to the gas flow passing through the throttle valve, the gas flow entering the intake manifold from the carbon tank and the gas flow entering the intake manifold from the crankshaft ventilation box, the EGR rate of the gas passing through the throttle valve, the EGR rate of the gas entering the intake manifold from the carbon tank and the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box are obtained;
the EGR rate of the gas is the ratio of the exhaust gas content to the total gas content, so the EGR rate of the canister into the intake manifold gas and the EGR rate of the crankcase into the intake manifold gas are substantially zero, while the EGR rate through the throttle gas can be calculated from the detected flow through the exhaust gas in the throttle and fresh control.
S3: acquiring the EGR rate of the mixing cavity in the previous period and the calculation step length of the EGR rate of the mixing cavity in the current period;
since the EGR calculation in the mixing chamber is performed continuously and in a closed loop during the continuous vehicle driving injection, the actual EGR rate for the last cycle is actually obtained when the EGR rate for the mixing chamber for the current cycle is calculated.
However, when the calculation step length of the EGR rate of the mixing chamber obtained in the current period is obtained, the calculation step length of the EGR rate of the mixing chamber obtained in the current period is generally directly performed in a preset time mode, that is, a model scheduling period in the lunger stota method is used as the calculation step length of the EGR rate of the mixing chamber obtained in the current period, but when the engine speed is high, the intake air flow rate is very high and the volume of the mixing chamber is small, the case that the calculation process is not finished at a certain moment and the gas flows out of the mixing chamber at a certain moment may occur during the calculation of the EGR rate, that is, the EGR rate calculation is invalid, so that the calculation cannot be performed simply in the preset time when.
Step S3 may therefore include the following steps:
s301: acquiring the EGR rate of the mixing cavity in the previous period, the total mass of gas in the instantaneous mixing cavity and the flow rate of gas flowing through the instantaneous mixing cavity;
the EGR rate of the mixing cavity in the previous period can be directly obtained through the vehicle-mounted terminal, the total mass of gas in the instantaneous mixing cavity and the flow rate of gas flowing through the instantaneous mixing cavity can be obtained by arranging corresponding sensors in the detection equipment, and it needs to be noted that the total mass of gas in the mixing cavity and the flow rate of gas are instantaneous data, so that the sensor unit is required to obtain corresponding data in real time and store the data in the vehicle-mounted terminal, and the data can be extracted in real time when the vehicle-mounted terminal needs the data.
S302: acquiring the gas outflow time of the mixing chamber in the current period according to the total mass of the gas in the instantaneous mixing chamber and the flow rate of the gas flowing through the instantaneous mixing chamber;
since each EGR rate calculation cycle is short, approaching 0.01s, the closest time of gas outflow in the mixing chamber can be obtained by the ratio of the total mass of gas in the instantaneous mixing chamber to the instantaneous flow rate of gas through the mixing chamber.
S303: judging whether the gas outflow time of the mixing cavity in the current period is greater than the preset time or not;
if so, taking the preset time as the current period to obtain the calculation step length of the EGR rate of the mixing cavity, and if not, taking the gas outflow time of the mixing cavity in the current period as the current period to obtain the calculation step length of the EGR rate of the mixing cavity.
The selection of the calculation step length for acquiring the EGR rate of the mixing cavity in the current period can ensure that the EGR rate can be quickly calculated under the condition of any mixing cavity and gas flow velocity so as to carry out timely fuel injection adjustment.
S4: and acquiring the calculation step length of the EGR rate of the mixing cavity according to the EGR rate of the throttle gas, the EGR rate of the gas entering the intake manifold from the carbon tank, the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box, the EGR rate of the mixing cavity in the previous period and the current period, and acquiring the EGR rate of the mixing cavity in the current period.
From the above, the embodiment of the present specification is a calculation method obtained by improving the conventional longgaku method, and the calculation formula after the improvement is as the following formula (1):
y(i+1)＝y(i)+h*(b1*K1+b2*K2+b3*K3+b4*K4) (1)，
wherein: y is(i)For the last cycle mixing chamber EGR rate, y(i+1)Mixing chamber EGR rate for the current cycle, b1、b2、b3And b4Is a predetermined coefficient, K1、K2、K3And K4And h is a calculation step length for acquiring the EGR rate of the mixing cavity in the current period.
In selecting the predetermined coefficient, K can be selected as desired1、K2、K3And K4Optionally, in the examples b of the present description1、b2、b3And b4Are all set to 1/4, indicating that K is1、K2、K3And K4As an adjustment parameter for the EGR rate of the current period.
And K1、K2、K3And K4Is obtained from the parameters of the different gases in the mixing chamber, in particular, K1Obtained by the formula (2), said K2Obtained by the formula (3), said K3Obtained and obtained by the formula (4)K is4Obtained by equation (5):
Figure BDA0002387692890000101
Figure BDA0002387692890000102
Figure BDA0002387692890000103
Figure BDA0002387692890000104
wherein: a is the gas flow passing through the throttle valve, B is the gas flow entering the intake manifold from the carbon tank, C is the gas flow entering the intake manifold from the crankshaft ventilation box, S is the total gas amount in the intake manifold in the current period, A(i+1)To pass the EGR rate of the throttle gas, B(i+1)EGR rate and C for canister intake manifold gas(i+1)The EGR rate of the crankcase ventilation gases entering the intake manifold.
In b1、b2、b3And b4In the case of substituting the specific solution of (A) into the formula, K of the EGR rate calculation2Based on K1Carry out the calculation of K3At K2，K1On the basis of (A) is calculated, K4Based on K3，K2，K1Carry out the calculation of K2，K3，K4The proportion of the previous step is higher when the respective slopes are calculated, and the final result can be more quickly approached by each calculation, so that the prediction speed is higher.
In the specific simulation and simulation prediction, please refer to fig. 8 and 9, it can be seen that when the simulation result of the conventional raggardt method is shown in fig. 8, the time required for the EGR rate to rise from about 0.05 to 0.2 is about 4 seconds, and the result obtained by predicting the EGR rate by using the improved raggardt method is shown in fig. 9, it can be seen from the figure that the final EGR rate prediction result is obtained within 0.5 seconds by using the improved raggardt method for predicting the EGR rate, and it can be seen from the comparison of the simulation result that the speed of predicting the EGR rate by using the improved raggardt method is faster, and the timeliness of the EGR rate prediction is ensured.
In addition, when the mixing cavity becomes smaller, the operation is performed according to the selection mode of the set current period step length, as shown in fig. 10-13, which are schematic diagrams of the results of simulation in different mixing cavity volumes, wherein fig. 10-12 are respectively the volume of the mixing cavity in 2000cm3，500cm3And 100cm3In the case of time, the current cycle step length in the calculation is preset time, namely the model scheduling cycle is used as the current cycle step length, and it can be seen that when the volume of the mixing cavity is 2000cm3Reduced to 500cm3The prediction speed of the EGR rate becomes fast, and finally the volume of the mixing cavity is 100cm3The prediction is invalid. Fig. 13 is a simulation diagram illustrating that the gas outflow time of the mixing chamber in the current period is used as the step length of the current period because the gas flow speed is increased due to the decrease of the volume of the mixing chamber, and finally the gas outflow time of the mixing chamber in the current period is smaller than the preset time, so that it can be seen that the EGR rate calculation does not fail at this time.
With the above-provided method for calculating an EGR rate, embodiments of the present specification further provide an apparatus for calculating an EGR rate, as shown in fig. 5 and 6, the apparatus including:
the device comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the gas flow entering an intake manifold through a throttle valve, a carbon tank and a crankshaft ventilation box in the current period, and the gas flow comprises the exhaust gas flow and the air flow;
the first calculation module is used for acquiring the EGR rate of gas passing through the throttle valve, the EGR rate of gas entering the intake manifold from the carbon tank and the EGR rate of gas entering the intake manifold from the crankshaft ventilation box according to the gas flow passing through the throttle valve, the gas flow entering the intake manifold from the carbon tank and the gas flow entering the intake manifold from the crankshaft ventilation box;
the second acquisition module is used for acquiring the EGR rate of the mixing cavity in the previous period and the calculation step length of the EGR rate of the mixing cavity acquired in the current period;
and the second calculation module is used for acquiring the calculation step length of the EGR rate of the mixing cavity according to the EGR rate of the throttle gas, the EGR rate of the gas entering the intake manifold from the carbon tank, the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box, the EGR rate of the mixing cavity in the previous period and the current period, and acquiring the EGR rate of the mixing cavity in the current period.
Further, the second obtaining module includes:
the first acquisition unit is used for acquiring the EGR rate of the mixing cavity in the previous period;
the second acquisition unit is used for acquiring the total mass of the gas in the instantaneous mixing cavity and the flow rate of the gas flowing through the instantaneous mixing cavity;
and the judging unit is used for judging whether the gas outflow time of the mixing cavity in the current period is greater than the preset time, if so, taking the preset time as the calculation step length of the EGR rate of the mixing cavity in the current period, and if not, taking the gas outflow time of the mixing cavity in the current period as the calculation step length of the EGR rate of the mixing cavity in the current period.
Further, the second calculation module includes:
a first calculating unit, configured to obtain the EGR rate of the mixing chamber in the current period according to formula (1), where formula (1) is:
y(i+1)＝y(i)+h*(b1*K1+b2*K2+b3*K3+b4*K4)，
wherein: y is(i)For the last cycle mixing chamber EGR rate, y(i+1)Mixing chamber EGR rate for the current cycle, b1、b2、b3And b4Is a predetermined coefficient, K1、K2、K3And K4And h is a calculation step length for acquiring the EGR rate of the mixing cavity in the current period.
Further, the second calculation module further comprises:
a second calculation unit for calculating K according to formula (2)1The formula (2) is:
Figure BDA0002387692890000121
a third calculation unit for calculating K according to formula (3)2The formula (3) is:
Figure BDA0002387692890000122
a fourth calculating unit for calculating K according to formula (4)3The formula (4) is:
Figure BDA0002387692890000123
and
a fifth calculating unit for calculating and obtaining K according to formula (5)3The formula (5) is:
Figure BDA0002387692890000124
wherein: a is the gas flow passing through the throttle valve, B is the gas flow entering the intake manifold from the carbon tank, C is the gas flow entering the intake manifold from the crankshaft ventilation box, S is the total gas amount in the intake manifold in the current period, A(i+1)To pass the EGR rate of the throttle gas, B(i+1)EGR rate and C for canister intake manifold gas(i+1)The EGR rate of the crankcase ventilation gases entering the intake manifold.
The embodiment of the invention provides a vehicle-mounted terminal, which comprises a processor and a memory;
the memory stores one or more instructions adapted to be loaded and executed by the processor to implement the EGR rate calculation method as described in the above method embodiments.
The memory may be used to store software programs and modules, and the processor may execute various functional applications and data processing by operating the software programs and modules stored in the memory. The memory can mainly comprise a program storage area and a data storage area, wherein the program storage area can store an operating system, application programs needed by functions and the like; the storage data area may store data created according to use of the apparatus, and the like. Further, the memory may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device. Accordingly, the memory may also include a memory controller to provide the processor access to the memory.
Fig. 7 is a schematic structural diagram of a vehicle-mounted terminal according to an embodiment of the present invention, where an internal configuration of the vehicle-mounted terminal may include, but is not limited to: the processor, the network interface and the memory in the in-vehicle terminal may be connected by a bus or in other manners, and in fig. 7 shown in the embodiment of the present specification, the connection by the bus is taken as an example.
It is understood that the Memory may be a high-speed RAM Memory device, a non-volatile Memory device such as at least one magnetic disk Memory device, or at least one Memory device located remotely from the processor, and that the Memory provides a storage space storing an operating system of the vehicle-mounted terminal, including but not limited to Windows system (an operating system), L inux (an operating system), and the like, and further stores one or more instructions suitable for being loaded and executed by the processor, wherein the instructions may be one or more instructions that are implemented by a computer (including one or more computer program code) in an embodiment of the present invention.
Embodiments of the present invention also provide a computer-readable storage medium, which may be disposed in a vehicle-mounted terminal to store at least one instruction, at least one program, a code set, or a set of instructions related to a method for calculating an EGR rate in the method embodiments, where the at least one instruction, the at least one program, the code set, or the set of instructions may be loaded and executed by a processor of an electronic device to implement the method for calculating an EGR rate provided in the method embodiments.
Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The method and the device for calculating the EGR rate, the vehicle-mounted terminal and the storage medium have the following beneficial effects that:
1) according to the method and the device for calculating the EGR rate, the vehicle-mounted terminal and the storage medium, the EGR rate in the previous period is substituted into the calculation of the EGR rate in the current period, and the accuracy of the calculation of the EGR rate is improved.
2) According to the method and the device for calculating the EGR rate, the vehicle-mounted terminal and the storage medium, the calculation of the EGR rate is closer to a final result by setting corresponding parameters, the calculation speed is higher, the delay of the calculation of the EGR rate is avoided, and the timeliness of the calculation of the EGR rate is ensured.
3) According to the method and the device for calculating the EGR rate, the vehicle-mounted terminal and the storage medium, when the gas flow rate of the engine is high or the gas volume of the mixing cavity is small, the calculation step length of the EGR rate of the mixing cavity obtained in the current period is limited, and the smooth calculation of the EGR rate is ensured.
While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (10)

1. A method of calculating an EGR rate, comprising the steps of:
acquiring the gas flow entering an intake manifold through a throttle valve, the gas flow entering the intake manifold through a carbon tank and the gas flow entering the intake manifold through a crankshaft ventilation box in the current period, wherein the gas flow comprises the exhaust gas flow and the air flow;
according to the gas flow passing through the throttle valve, the gas flow entering the intake manifold from the carbon tank and the gas flow entering the intake manifold from the crankshaft ventilation box, the EGR rate of the gas passing through the throttle valve, the EGR rate of the gas entering the intake manifold from the carbon tank and the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box are obtained;
acquiring the EGR rate of the mixing cavity in the previous period and the calculation step length of the EGR rate of the mixing cavity in the current period;
and acquiring the calculation step length of the EGR rate of the mixing cavity according to the EGR rate of the throttle gas, the EGR rate of the gas entering the intake manifold from the carbon tank, the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box, the EGR rate of the mixing cavity in the previous period and the current period, and acquiring the EGR rate of the mixing cavity in the current period.
2. The method of calculating the EGR rate of claim 1, wherein the obtaining the calculated step size of the last cycle of the mixing chamber EGR rate and the obtaining of the mixing chamber EGR rate for the current cycle comprises:
acquiring the EGR rate of the mixing cavity in the previous period, the total mass of gas in the instantaneous mixing cavity and the flow rate of gas flowing through the instantaneous mixing cavity;
acquiring the gas outflow time of the mixing chamber in the current period according to the total mass of the gas in the instantaneous mixing chamber and the flow rate of the gas flowing through the instantaneous mixing chamber;
judging whether the gas outflow time of the mixing cavity in the current period is greater than the preset time or not;
if so, taking the preset time as the current period to obtain the calculation step length of the EGR rate of the mixing cavity, and if not, taking the gas outflow time of the mixing cavity in the current period as the current period to obtain the calculation step length of the EGR rate of the mixing cavity.
3. The method of calculating an EGR rate according to claim 1, wherein the obtaining a calculation step of the mixture chamber EGR rate from the EGR rate through the throttle gas, the EGR rate through the canister into the intake manifold, the EGR rate through the crankcase into the intake manifold, the EGR rate through the mixing chamber in the previous cycle, and the current cycle, the obtaining the mixture chamber EGR rate in the current cycle includes:
obtaining the EGR rate of the mixing cavity in the current period according to the formula (1):
y(i+1)＝y(i)+h*(b1*K1+b2*K2+b3*K3+b4*K4) (1)，
wherein: y is(i)For the last cycle mixing chamber EGR rate, y(i+1)Mixing chamber EGR rate for the current cycle, b1、b2、b3And b4Is a predetermined coefficient, K1、K2、K3And K4And h is a calculation step length for acquiring the EGR rate of the mixing cavity in the current period.
4. The method of calculating the EGR rate according to claim 3, characterized in that K is1Obtained by the formula (2), said K2Obtained by the formula (3), said K3Obtained by the formula (4) and said K4Obtained by equation (5):
Figure FDA0002387692880000021
Figure FDA0002387692880000022
Figure FDA0002387692880000023
Figure FDA0002387692880000024
wherein: a is the gas flow passing through the throttle valve, B is the gas flow entering the intake manifold from the carbon tank, C is the gas flow entering the intake manifold from the crankshaft ventilation box, S is the total gas amount in the intake manifold in the current period, A(i+1)To pass the EGR rate of the throttle gas, B(i+1)EGR rate and C for canister intake manifold gas(i+1)The EGR rate of the crankcase ventilation gases entering the intake manifold.
5. An apparatus for calculating an EGR rate, the apparatus comprising:
the device comprises a first acquisition module, a second acquisition module and a control module, wherein the first acquisition module is used for acquiring the gas flow entering an intake manifold through a throttle valve, a carbon tank and a crankshaft ventilation box in the current period, and the gas flow comprises the exhaust gas flow and the air flow;
the first calculation module is used for acquiring the EGR rate of gas passing through the throttle valve, the EGR rate of gas entering the intake manifold from the carbon tank and the EGR rate of gas entering the intake manifold from the crankshaft ventilation box according to the gas flow passing through the throttle valve, the gas flow entering the intake manifold from the carbon tank and the gas flow entering the intake manifold from the crankshaft ventilation box;
the second acquisition module is used for acquiring the EGR rate of the mixing cavity in the previous period and the calculation step length of the EGR rate of the mixing cavity acquired in the current period;
and the second calculation module is used for acquiring the calculation step length of the EGR rate of the mixing cavity according to the EGR rate of the throttle gas, the EGR rate of the gas entering the intake manifold from the carbon tank, the EGR rate of the gas entering the intake manifold from the crankshaft ventilation box, the EGR rate of the mixing cavity in the previous period and the current period, and acquiring the EGR rate of the mixing cavity in the current period.
6. The apparatus for calculating the EGR rate according to claim 5, wherein the second obtaining module includes:
the first acquisition unit is used for acquiring the EGR rate of the mixing cavity in the previous period;
the second acquisition unit is used for acquiring the total mass of the gas in the instantaneous mixing cavity and the flow rate of the gas flowing through the instantaneous mixing cavity;
and the judging unit is used for judging whether the gas outflow time of the mixing cavity in the current period is greater than the preset time, if so, taking the preset time as the calculation step length of the EGR rate of the mixing cavity in the current period, and if not, taking the gas outflow time of the mixing cavity in the current period as the calculation step length of the EGR rate of the mixing cavity in the current period.
7. The apparatus for calculating the EGR rate according to claim 5, wherein the second calculating module includes:
a first calculating unit, configured to obtain the EGR rate of the mixing chamber in the current period according to formula (1), where formula (1) is:
y(i+1)＝y(i)+h*(b1*K1+b2*K2+b3*K3+b4*K4)；
wherein: y is(i)Mixing chamber EGR, y for previous cycle(i+1)Mixing Chamber EGR for the Current cycle, b1、b2、b3And b4Is a predetermined coefficient, K1、K2、K3And K4And h is a calculation step length for acquiring the EGR rate of the mixing cavity in the current period.
8. The apparatus for calculating the EGR rate according to claim 7, wherein the second calculating module further comprises:
a second calculation unit for calculating K according to formula (2)1The formula (2) is:
Figure FDA0002387692880000031
a third calculation unit for calculating K according to formula (3)2The formula (3) is:
Figure FDA0002387692880000032
a fourth calculating unit for calculating K according to formula (4)3The formula (4) is:
Figure FDA0002387692880000033
a fifth calculating unit for calculating and obtaining K according to formula (5)3The formula (5) is:
Figure FDA0002387692880000041
wherein: a is the gas flow passing through the throttle valve, B is the gas flow entering the intake manifold from the carbon tank, C is the gas flow entering the intake manifold from the crankshaft ventilation box, S is the total gas amount in the intake manifold in the current period, A(i+1)To pass the EGR rate of the throttle gas, B(i+1)EGR rate and C for canister intake manifold gas(i+1)The EGR rate of the crankcase ventilation gases entering the intake manifold.
9. A vehicle-mounted terminal is characterized by comprising a processor and a memory;
the memory storing one or more instructions adapted to be loaded by the processor and to execute the computer program to implement an EGR rate calculation method according to any one of claims 1 to 4.
10. A storage medium having stored therein at least one instruction, at least one program, set of codes, or set of instructions, which is loaded and executed by a processor to implement a method of EGR rate calculation as claimed in any one of claims 1 to 4.
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