CN115111078A - Engine torque monitoring method, equipment and storage medium - Google Patents
Engine torque monitoring method, equipment and storage medium Download PDFInfo
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
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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
- F02D41/22—Safety or indicating devices for abnormal conditions
- F02D2041/228—Warning displays
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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
- 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
- F02D2200/0402—Engine intake system parameters the parameter being determined by using a model of the engine intake or its components
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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
- 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
- F02D2200/0406—Intake manifold pressure
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1002—Output torque
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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
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- 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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Abstract
The application provides a method, equipment and a storage medium for monitoring engine torque, and relates to the technical field of vehicles. The method comprises the following steps: acquiring actual torque of the engine according to first stroke air inflow of the engine and the rotating speed of the engine, wherein the first stroke air inflow is the air inflow per stroke determined according to the pressure of an intake manifold; acquiring a reference torque of the engine according to the second stroke air inflow of the engine and the rotating speed of the engine, wherein the second stroke air inflow is the air inflow per stroke determined according to an ideal gas state equation and a manifold pressure model; and determining whether to perform fault early warning according to the actual torque and the reference torque, wherein the fault early warning is used for indicating that the actual torque of the engine is unreasonable. The method solves the problem that the reasonability check of the torque can not be carried out by calculating the reference torque of the engine according to the air intake flow because the air intake flow can not be accurately measured in real time for the vehicle type which is not provided with the air intake flow sensor.
Description
Technical Field
The present disclosure relates to vehicle technologies, and in particular, to a method, a device, and a storage medium for monitoring engine torque.
Background
An Engine Management System (EMS) realizes normal operation of an engine through torque control, and when the engine torque calculation has a problem, the engine control system is disturbed, unexpected running of a vehicle can be caused, and harm is brought to a driver and passengers, so that the torque monitoring of the engine has important significance.
For a vehicle type which is simultaneously provided with an intake flow sensor and an intake manifold pressure sensor, the prior art measures the real intake manifold pressure through the intake manifold pressure sensor, and calculates the actual torque of an engine according to the real manifold pressure; calculating the pressure of an intake manifold model according to the intake flow measured by the intake flow sensor and the manifold pressure model, and further calculating the reference torque of the engine; and (3) monitoring the deviation between the actual torque of the engine and the reference torque of the engine, and when the integral of the deviation of the two torques reaches a threshold value, judging that the torque of the engine is unreasonable by the system, and triggering a safety speed limit after a certain time.
For a vehicle model which is not provided with an intake flow sensor, the intake flow cannot be accurately measured in real time, so that the engine reference torque cannot be calculated according to the intake flow, and therefore a new method is needed for calculating the engine reference torque so as to check the reasonability of the torque.
Disclosure of Invention
The application provides a monitoring method, equipment and a storage medium of engine torque, which are used for solving the problem that the reasonability check of the torque can not be carried out by calculating the reference torque of an engine according to the air intake flow because the air intake flow can not be accurately measured in real time for the vehicle type which is not provided with an air intake flow sensor.
In one aspect, the present application provides a method of monitoring engine torque, comprising:
acquiring actual torque of an engine according to a first stroke air inflow of the engine and the rotating speed of the engine, wherein the first stroke air inflow is the air inflow per stroke determined according to the pressure of an intake manifold;
acquiring reference torque of the engine according to a second stroke air inflow of the engine and the rotating speed of the engine, wherein the second stroke air inflow is the air inflow per stroke determined according to an ideal gas state equation and a manifold pressure model;
and determining whether to carry out fault early warning according to the actual torque and the reference torque, wherein the fault early warning is used for indicating that the actual torque of the engine is unreasonable.
Optionally, before the obtaining of the actual torque of the engine according to the first stroke intake air amount of the engine and the rotation speed of the engine, the method further comprises:
obtaining the fresh air intake amount of each stroke, the residual mass of the waste gas in each stroke and the backflow mass of the waste gas in each stroke; wherein the fresh air intake per stroke is determined by intake manifold pressure;
and according to the fresh air intake quantity of each stroke, subtracting the residual mass of the exhaust gas in each stroke and the backflow mass of the exhaust gas in each stroke to obtain the first stroke air intake quantity.
Optionally, before the reference torque of the engine is obtained according to the second stroke air intake quantity of the engine and the rotating speed of the engine, the method further comprises:
obtaining the pressure of an intake manifold model according to the opening of a throttle valve and the manifold pressure model;
and obtaining the second stroke air inflow according to the model pressure of the intake manifold, the displacement of the engine, the temperature of the air in the intake manifold and the ideal gas state equation.
Optionally, the manifold pressure model is a function of the throttle opening, a temperature of a gas in the intake manifold, a charging efficiency, and a boost pressure.
Optionally, the determining whether to perform fault early warning according to the actual torque and the reference torque includes:
acquiring a torque deviation according to the actual torque and the reference torque;
after the torque deviation exceeds the allowable deviation, obtaining a residual deviation according to the difference value of the torque deviation and the allowable deviation;
and determining whether to carry out fault early warning or not according to the residual deviation.
Optionally, the determining whether to perform fault early warning according to the residual deviation includes:
integrating the residual deviation to obtain an integral value;
and when the integral value is larger than a fault threshold value, carrying out fault early warning.
Optionally, after performing the fault pre-warning when the integrated value is greater than the fault threshold, the method further includes:
continuously acquiring the running time of the engine after fault early warning is carried out;
and triggering vehicle speed limiting protection when the running time is longer than the preset time.
In another aspect, the present application provides an engine torque monitoring apparatus, comprising:
the actual torque module is used for obtaining the actual torque of the engine according to the first stroke air inflow of the engine and the rotating speed of the engine, wherein the first stroke air inflow is the air inflow per stroke determined according to the pressure of an intake manifold;
the reference torque module is used for obtaining reference torque of the engine according to second stroke air inflow of the engine and the rotating speed of the engine, wherein the second stroke air inflow is the air inflow per stroke determined according to an ideal gas state equation and a manifold pressure model;
and the fault early warning module is used for determining whether fault early warning is carried out or not according to the actual torque and the reference torque, and the fault early warning is used for indicating that the actual torque of the engine is unreasonable.
Before the actual torque of the engine is obtained according to the first stroke air intake quantity of the engine and the rotating speed of the engine, the actual torque module is also used for,
obtaining the fresh air intake amount of each stroke, the residual mass of the waste gas in each stroke and the backflow mass of the waste gas in each stroke; wherein the fresh air intake per stroke is determined by intake manifold pressure;
and according to the fresh air intake quantity of each stroke, subtracting the residual mass of the exhaust gas in each stroke and the backflow mass of the exhaust gas in each stroke to obtain the first stroke air intake quantity.
Before the reference torque of the engine is obtained according to the second stroke air inlet quantity of the engine and the rotating speed of the engine, the reference torque module is also used for,
obtaining the pressure of an intake manifold model according to the opening of a throttle valve and the manifold pressure model;
and obtaining the second stroke air inflow according to the model pressure of the air inlet manifold, the displacement of the engine, the temperature of the air in the air inlet manifold and the ideal gas state equation.
Optionally, the torque module is referenced to a manifold pressure model that is a function of throttle opening, temperature of gas in the intake manifold, charge efficiency, and boost pressure.
Optionally, the fault pre-warning module is further configured to determine whether to perform fault pre-warning according to the actual torque and the reference torque,
acquiring torque deviation according to the actual torque and the reference torque;
after the torque deviation exceeds the allowable deviation, obtaining residual deviation according to the difference value of the torque deviation and the allowable deviation;
and determining whether to carry out fault early warning or not according to the residual deviation.
Optionally, the fault pre-warning module is further configured to determine whether to perform fault pre-warning according to the remaining deviation,
integrating the residual deviation to obtain an integral value;
and when the integral value is larger than the fault threshold value, carrying out fault early warning.
Optionally, the fault pre-warning module is further configured to, when the integral value is greater than the fault threshold value, after performing fault pre-warning,
continuously acquiring the running time of the engine after fault early warning is carried out;
and when the running time is longer than the preset time, triggering the vehicle speed limiting protection.
In a third aspect of the present application, there is provided an electronic device including:
a processor and a memory;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored by the memory to cause the electronic device to perform the method of any of the first aspects.
In a fourth aspect of the present application, a computer-readable storage medium is provided, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, the computer-readable storage medium is used for implementing the method for determining the driver of the hardware peripheral according to any one of the first aspect.
The method, the device and the storage medium for monitoring the engine torque provided by the embodiment acquire the actual torque through the first stroke air inflow and the rotating speed of the engine; acquiring reference torque through the second stroke air inflow and the rotating speed of the engine; and determining whether to perform fault early warning according to the actual torque and the reference torque. The method for monitoring the torque of the engine solves the problem that no intake flow sensor can not obtain the reference torque of the engine, provides a basis for the fault early warning of unreasonable actual torque of the engine, and improves the safety of the system.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
FIG. 1 is a basic flow diagram of an Engine Management System (EMS);
FIG. 2 is a first flowchart of a method for monitoring engine torque provided by an embodiment of the present application;
FIG. 3 is a second flowchart of a method for monitoring engine torque provided in an embodiment of the present application;
FIG. 4 is a flow chart diagram III of a method for monitoring engine torque provided by an embodiment of the present application;
FIG. 5 is a schematic structural diagram of an engine torque monitoring apparatus according to an embodiment of the present disclosure;
fig. 6 is a hardware configuration diagram of a monitoring apparatus for engine torque according to an embodiment of the present application.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The engine is used as a high-power supply device and a continuous voyage mileage guarantee device on the automobile, and the tracking precision of the engine on the required power and the torque directly influences the overall performance of the automobile. The engine control system based on torque coordination can weaken fluctuation of the rotating speed of the engine through optimized adjustment of torque output, and improve the drivability of the whole vehicle. The torque control is centered because the fuel injection amount, the throttle opening degree, and the ignition advance angle, which are control parameters, are directly executed as control commands during the operation of the engine. When various demands of the engine conflict (such as a vehicle running torque demand, a torque demand of an auxiliary device and a torque demand of each subsystem of the vehicle), coordination among various control quantities is difficult. Therefore, by taking the engine torque tracking as a center, the contradictory torque requirements can be coordinated on the premise of meeting the running requirements of the driver and the vehicle.
Fig. 1 is a basic flow diagram of an Engine Management System (EMS). As shown in fig. 1, in the control system based on torque coordination, an Engine Management System (EMS) collects all torque requests, then determines different torque request priorities and coordinates them, outputs the requested torque, and calculates the required intake air amount, air-fuel ratio, and ignition advance angle with the engine requested torque. The requested torque output by an Engine Management System (EMS) is referred to herein.
In the prior art, in order to calculate the engine reference torque, an intake manifold model pressure is usually calculated by using an intake flow measured by an intake flow sensor and a manifold pressure model, and then the engine reference torque is calculated. However, in a vehicle model in which the intake air flow sensor is not installed, there is a difficulty in calculating the engine reference torque.
The application provides a method for monitoring engine torque, which obtains actual torque through first stroke air inflow and rotating speed of an engine; acquiring reference torque through the second stroke air inflow and the rotating speed of the engine; and determining whether to perform fault early warning according to the actual torque and the reference torque. The method for monitoring the torque of the engine solves the problem that no intake flow sensor can not obtain the reference torque of the engine, provides a basis for the fault early warning of unreasonable actual torque of the engine, and improves the safety of the system.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. These several specific embodiments may be combined with each other below, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 2 is a first flowchart of a method for monitoring engine torque according to an embodiment of the present disclosure. As shown in fig. 2, the method of the present embodiment includes:
s201, acquiring actual torque of the engine according to a first stroke air inflow of the engine and the rotating speed of the engine, wherein the first stroke air inflow is an air inflow per stroke determined according to the pressure of an intake manifold;
the stroke, also called piston stroke or piston stroke, refers to the distance the piston moves from the bottom dead center to the top dead center, and may also be understood as the maximum distance the piston travels within the cylinder. The stroke has a great influence on the performance of the engine. A typical four-stroke engine includes an intake stroke, a compression stroke, a power stroke, and an exhaust stroke. The piston moves downward for the first time to perform an intake stroke and fresh air or a mixture of fuel and air is injected into the cylinder through one or more intake valves. The intake valve is closed and the subsequent compression stroke compresses the mixture in the cylinder. The mixture is ignited by the spark plug near the top of the compression stroke. The thrust force generated by the burnt hot gas forces the piston to make a third downward movement (power stroke). The fourth and final stroke is an exhaust stroke and combusted gases are exhausted from the cylinder through an exhaust valve.
The intake manifold refers to an intake line from behind the throttle body to before the cylinder head intake passage. Its function is to distribute fresh air or fuel mixture to the cylinder intake ports. The intake air per stroke is the mass of fresh air drawn into the engine cylinder during the intake stroke. Intake manifold pressure refers to the actual pressure at the intake manifold as measured by a sensor.
The actual torque of the engine represents the torque that actually occurs in the engine.
In the embodiment, the actual engine torque Tq intk By the intake air quantity m per stroke of the engine stk1 And engine speed n eng Obtained by interpolation of calibration curves, i.e. Tq intk ＝f(m stk1 ，n eng ). Wherein the calibration curve refers to recording the air intake amount m of each stroke of the engine according to the running of the engine stk1 Engine speed n eng And actual engine torque Tq intk The three-dimensional relationship graph formed by the data of the three components can be obtained by measuring the actual torque value of the vehicle under different operating conditions. When the calibration curve interpolation is carried out, namely the searching and positioning are carried out in the existing three-dimensional relational graph, and the interpolation method is adopted to solve when the data positioning is carried out at the points which are not on the graph.
S202, acquiring reference torque of the engine according to the second stroke air inflow of the engine and the rotating speed of the engine, wherein the second stroke air inflow is the air inflow per stroke determined according to an ideal gas state equation and a manifold pressure model;
the reference torque of the engine represents the torque of the engine in an ideal state, and can be used as an ideal reference value.
The ideal gas state equation, also called ideal gas law and pervasive gas law, is a state equation describing the relationship between pressure, volume, amount of substance and temperature when an ideal gas is in an equilibrium state. The ideal gas state equation is established on the basis of the Boyle-Mariotte's law, Charles ' law, Geiger-Lussac's law and other laws. The expression of the ideal gas state equation is
PV＝nRT
Wherein, P refers to the pressure of ideal gas; v is the volume of the ideal gas; n represents the amount of gaseous species; r is an ideal gas constant; t represents the thermodynamic temperature of the ideal gas.
Intake manifold model pressure p intkmodel Is determined by the throttle area, the temperature of the gas in the intake manifold, the charging efficiency, and the boost pressure, i.e., the intake manifold model is an intake manifold model pressure p that is determined by the throttle area, the temperature of the gas in the intake manifold, the charging efficiency, and the boost pressure as independent variables intkmodel As a function of the dependent variable.
The second stroke air inflow is the theoretical air inflow per stroke determined according to an ideal gas state equation and a manifold pressure model;
in the present embodiment, the reference torque Tq of the engine throttle Theoretical intake air quantity m per stroke of engine stkmodel And engine speed n eng Obtained by interpolation of calibration curves, i.e. Tq throttle ＝f(m stkmodel ，n eng ). Wherein the calibration curve refers to recording the theoretical intake air quantity m of each stroke of the engine according to the running of the engine stkmodel Engine speed n eng And engine reference torque Tq throttle The three-dimensional relationship graph formed by the data of the three components can be obtained by measuring the actual torque value of the vehicle under different operating conditions. When the calibration curve interpolation is carried out, namely the searching and positioning are carried out in the existing three-dimensional relational graph, and the interpolation method is adopted to solve when the data positioning is carried out at the points which are not on the graph.
And S203, determining whether to carry out fault early warning according to the actual torque and the reference torque, wherein the fault early warning is used for indicating that the actual torque of the engine is unreasonable.
In this embodiment, whether to perform the fault warning is determined by comparing the actual torque with the reference torque. The closer the actual torque is to the reference torque, the more reasonable the actual torque of the engine is, the normal operation of the engine is, if the difference between the actual torque and the reference torque is larger, the unreasonable actual torque of the engine is represented, the abnormal operation of the engine is considered, and if the difference between the actual torque and the reference torque reaches a preset value, the fault early warning is carried out.
The embodiment provides a method for monitoring engine torque, which obtains actual torque through a first stroke air intake quantity and a rotating speed of an engine; acquiring reference torque through the second stroke air inflow and the rotating speed of the engine; and determining whether to perform fault early warning according to the actual torque and the reference torque. The method for monitoring the torque of the engine solves the problem that no intake flow sensor can not obtain the reference torque of the engine to check the reasonability of the torque, provides a basis for the unreasonable fault early warning of the actual torque of the engine, and improves the safety of the system.
Fig. 3 is a second flowchart of a method for monitoring engine torque according to an embodiment of the present disclosure. As shown in fig. 3, the method of the present embodiment includes:
s301, obtaining fresh air intake amount of each stroke, residual mass of waste gas in each stroke and backflow mass of waste gas in each stroke; wherein the fresh air intake per stroke is determined by intake manifold pressure;
in the present embodiment, the automobile adopts an exhaust gas recirculation technology. The cylinder therefore contains three gases: fresh air intake m per stroke intk Internal exhaust gas residual mass m per stroke egrres And internal exhaust gas recirculation mass m per stroke egrback The unit of mass of all three gases is mg/stk.
Exhaust Gas Recirculation (EGR) refers to the Recirculation of a portion of the Exhaust gases from the engine back into the intake manifold and re-into the cylinder along with fresh mixture. Since exhaust gas contains a large amount of polyatomic gas such as CO2, while gas such as CO2 cannot be combusted and absorbs a large amount of heat due to its high specific heat capacity, the maximum combustion temperature of the air-fuel mixture in the cylinder is lowered, and the amount of nitrogen oxides NOx generated is reduced. EGR functions primarily by two aspects: 1. CO2 and water vapor in EGR increase the specific heat capacity of the working medium, and the addition of waste gas dilutes the oxygen concentration in the original mixed gas, so that the combustion speed is slowed, the highest temperature and the average temperature in the combustion process are reduced, the favorable environment for generating nitrogen oxides NOx is damaged, and the emission of the nitrogen oxides NOx is greatly reduced; 2. because the load regulation mode of the gasoline engine is usually quantity regulation, the EGR is applied to the gasoline engine to correspondingly increase the air intake quantity, the increase of the EGR rate can reduce the throttling loss of the gasoline engine under the working condition of medium and low load, and the fuel consumption rate of the gasoline engine is reduced. Specifically, the return flow of the exhaust gas is realized by connecting a pipe having an EGR control valve between two flows of the intake gas and the exhaust gas, and controlling the increase or decrease of the flow rate by the opening degree of the EGR control valve.
In the present embodiment, the fresh air intake amount m per stroke inik Determined by the intake manifold pressure, specifically, can be calculated by the following equation:
wherein p is inik Intake manifold pressure measured by an intake manifold pressure sensor in Pa; vol EffAir Is fresh air intake volume in cm 3 ；fac Air Adjusting the coefficient for the intake volume; te (Te) Intk Intake manifold temperature in K; te (Te) IntkRef Is an intake manifold thermodynamic reference temperature value; C287J/kg K, gas constant.
In this embodiment, the residual mass m of exhaust gas in each stroke egrres Can be calculated by the following formula:
wherein p is inik Intake manifold pressure measured by an intake manifold pressure sensor in Pa; p is a radical of exh Is exhaust manifold pressure in Pa;
a correction factor for reflux mass versus pressure; vol EffEgr Is the residual volume of internal waste gas in cm 3 ；fac Egr Adjusting the coefficient for the residual volume of the internal waste gas; te (Te) exh Exhaust manifold temperature in K; te (Te) ExhRef Is an exhaust pipe thermodynamic reference temperature value; C287J/kg K, gas constant.
In this embodiment, the internal exhaust gas recirculation mass m per stroke egrback Can be calculated by the following formula:
m egrback ＝f(W ink ，W exh ，Te Intk ，p intk ，p exh )
wherein, W ink Is an intake VVT angle; w exh Is an exhaust VVT angle; te (Te) exh Exhaust manifold temperature in K; p is a radical of inik Intake manifold pressure measured by an intake manifold pressure sensor in Pa; p is a radical of exh Is exhaust manifold pressure in Pa. The VVT is a variable valve timing technology of an automobile engine, and the basic principle is that according to the running condition of the engine, the opening and closing angles of an intake valve and/or an exhaust valve are adjusted, so that the intake and exhaust are always in an ideal state, and the combustion efficiency is improved. Different from the traditional technology, the VVT control system breaks the fixed phase relation between the camshaft and the crankshaft and changes the fixed phase relation into the fixed phase relation according to the working condition.
And S302, subtracting the residual mass of the exhaust gas in each stroke and the backflow mass of the exhaust gas in each stroke according to the fresh air intake amount in each stroke to obtain the first stroke intake amount.
In the present embodiment, the first stroke intake air amount m stk1 Can be calculated by the following formula:
m stk1 ＝m intk -m egrres -m egrback
the variables are as described above and will not be described in detail herein.
S303, acquiring the actual torque of the engine according to the first stroke air inflow of the engine and the rotating speed of the engine;
in the present embodiment, the actual engine torque is determined by the intake air amount m per engine stroke stk1 And engine speed n eng Obtained by interpolation of calibration curves, i.e. Tq intk ＝f(m stk1 ，n eng )。
S303, obtaining the pressure of the intake manifold model according to the opening of a throttle valve and the manifold pressure model;
the throttle valve is a controllable valve for controlling fresh air to enter the engine, is connected with an air filter at the upper part and connected with an air inlet manifold of the engine at the lower part, and is mainly used for controlling the amount of the fresh air entering the cylinder. The charging efficiency refers to the charging efficiency of an engine cylinder, and the supercharging pressure is measured by a sensor in front of a throttle valve.
Intake manifold model pressure P in Pa intkmodel Is a function relating to the throttle area, the temperature of the gas in the intake manifold, the charging efficiency, and the supercharging pressure, and therefore the intake manifold model pressure p can be obtained by knowing the throttle opening and the manifold pressure model intkmodel 。
Optionally, the manifold pressure model is a function of throttle opening, temperature of gas in the intake manifold, charge efficiency and boost pressure, i.e.
P intkmodel F (throttle area, temperature of gas in intake manifold, charging efficiency, boost pressure)
S305, obtaining second stroke air inflow according to the model pressure of the air inlet manifold, the displacement of the engine, the temperature of air in the air inlet manifold and an ideal air state equation;
firstly, according to the ideal gas state equation, the mass m of air sucked by the engine per revolution with the unit of mg/r can be obtained according to the following formula rev ，
In the formula: v. of Eng Is the engine displacement, in units of L; R8.314J/(mol.k) is an ideal gas constant; m is 28.959g/mol, the molar mass of air; t is intk 293K, intake manifold temperature used in the calculation; and A is an engine stroke correction coefficient.
Specifically, when the engine is four-stroke, each cylinder is operating with half a crankshaft revolution. When the crankshaft rotates by one ring and two cylinders are in suction operation, A is 0.5, and when the type of the engine is changed, the stroke correction coefficient of the engine is changed.
Δ t is the operating time per revolution of the engine crankshaft, in units of s/r, i.e.
n eng The unit is the engine speed and r/min.
Obtaining the mass m of air sucked by each revolution of the engine rev Then, the mass m of air sucked in per revolution of the engine is obtained rev And Δ t can give the average mass flow of the intake manifold in mg/s
Order to
Then
Theoretical intake air quantity m per stroke of engine with unit of mg/stk stkmodel Comprises the following steps:
in the formula:
Δt stk in units of s/stk, is the operating time of each stroke of engine operation, D EngCyl Is the number of cylinders of the engine.
Therefore, the theoretical intake air amount m per stroke of the engine stkmodel Can be obtained by the following formula:
namely, it is
S306, acquiring reference torque of the engine according to the second stroke air inflow of the engine and the rotating speed of the engine;
according to the calculated theoretical air intake quantity m of each stroke of the engine stkmodel And engine speed n eng Performing calibration curve interpolation to obtain the engine reference torque Tq throttle Namely:
Tq throttle ＝f(m stkmodel ，n eng )
s307, determining whether to carry out fault early warning according to the actual torque and the reference torque, wherein the fault early warning is used for indicating that the actual torque of the engine is unreasonable
And S308, determining whether to perform fault early warning according to the actual torque and the reference torque, wherein the fault early warning is used for indicating that the actual torque of the engine is unreasonable.
The embodiment provides a method for monitoring engine torque, which obtains the intake quantity of fresh air per stroke through intake manifold pressure; obtaining first stroke air inflow according to the fresh air inflow of each stroke, the residual mass of the waste gas in each stroke and the backflow mass of the waste gas in each stroke, and obtaining actual torque by combining the rotating speed of the engine; obtaining the pressure of an intake manifold model through the opening of a throttle valve and a manifold pressure model; obtaining the second stroke air input through the model pressure of the air inlet manifold, the discharge capacity of the engine, the temperature of air in the air inlet manifold and an ideal air state equation, and further obtaining the reference torque by combining the rotating speed of the engine; and determining whether to perform fault early warning according to the actual torque and the reference torque. According to the monitoring method of the engine torque, the fact that the interior of the engine cannot be all fresh air in practical application is considered, and the accurate first stroke air inflow is obtained by deducting the residual mass and the backflow mass of the waste gas in the engine, so that the fault early warning is more in line with the actual situation, and the monitoring effect of the engine torque is more accurate. Under the condition that no intake flow sensor exists, the engine torque monitoring method utilizes an intake manifold model and an ideal state equation to obtain a reference torque which is close to the reality, and further solves the problem that the reasonability check of the torque can not be carried out by calculating the reference torque without the intake flow sensor.
Fig. 4 is a third flowchart of a method for monitoring engine torque according to an embodiment of the present application, where as shown in fig. 4, the method according to the present embodiment includes:
s401, acquiring torque deviation according to the actual torque and the reference torque;
s402, obtaining a residual deviation according to the difference value of the torque deviation and the allowable deviation after the torque deviation exceeds the allowable deviation;
s403, integrating the residual deviation to obtain an integral value;
in the present embodiment, the integration process is performed on the remaining deviation, and the cumulative effect of the remaining deviation on time is considered. After obtaining the residual deviation, an Engine Management System (EMS) or other systems of the vehicle may repair the actual torque of the engine, for example, the Engine Management System (EMS) may adjust the intake air amount, the air-fuel ratio, and the ignition advance angle of the engine to adjust the reference torque and thus the actual torque.
S404, when the integral value is larger than a fault threshold value, carrying out fault early warning;
in this embodiment, the failure threshold may be set by itself.
S405, continuously acquiring the running time of the engine after fault early warning is carried out;
the purpose of setting the running time in the embodiment is to prevent the vehicle speed limiting protection from being triggered quickly after the fault early warning, and reserve time for engine torque restoration.
And S406, triggering vehicle speed limiting protection when the running time is longer than the preset time.
In this embodiment, the vehicle speed limit protection may take a variety of forms. For example, vehicle speed protection may be achieved by limiting the maximum vehicle speed. The preset duration can be set by itself.
In the method for monitoring the engine torque provided by the embodiment, the torque deviation and the residual deviation are calculated, and the residual deviation is subjected to integration processing to obtain an integral value; carrying out fault early warning by comparing the integral value with a fault threshold value; and vehicle speed protection is carried out by obtaining the running time of the engine and comparing the running time with the preset time. According to the monitoring method of the engine torque, after the torque deviation is considered, the system has the possibility of fault repair, delayed fault early warning caused by repair is processed through time integration, and the usability of monitoring of the engine torque in an actual scene is improved.
Fig. 5 is a schematic structural diagram of a monitoring device for engine torque according to an embodiment of the present disclosure. The apparatus of the present embodiment may be in the form of software and/or hardware. As shown in fig. 5, the present embodiment provides an engine torque monitoring apparatus 500, including: an actual torque module 501, a reference torque module 502, and a fault warning module 503, wherein,
the actual torque module is used for obtaining the actual torque of the engine according to the first stroke air inflow of the engine and the rotating speed of the engine, wherein the first stroke air inflow is the air inflow per stroke determined according to the pressure of an intake manifold;
the reference torque module is used for obtaining reference torque of the engine according to second stroke air inflow of the engine and the rotating speed of the engine, wherein the second stroke air inflow is the air inflow per stroke determined according to an ideal gas state equation and a manifold pressure model;
and the fault early warning module is used for determining whether fault early warning is performed or not according to the actual torque and the reference torque, and the fault early warning is used for indicating that the actual torque of the engine is unreasonable.
In a possible implementation manner, before the actual torque of the engine is obtained according to the first stroke air intake quantity of the engine and the rotating speed of the engine, the actual torque module is also used for,
obtaining the fresh air intake amount of each stroke, the residual mass of the waste gas in each stroke and the backflow mass of the waste gas in each stroke; wherein the fresh air intake per stroke is determined by intake manifold pressure;
and subtracting the residual mass of the exhaust gas in each stroke and the backflow mass of the exhaust gas in each stroke according to the fresh air intake amount in each stroke to obtain the first stroke intake amount.
In a possible implementation manner, before the reference torque of the engine is obtained according to the air intake quantity of the second stroke of the engine and the rotating speed of the engine, the reference torque module is also used for,
obtaining the pressure of an intake manifold model according to the opening of a throttle valve and the manifold pressure model;
and obtaining the second stroke air inflow according to the model pressure of the air inlet manifold, the displacement of the engine, the temperature of the air in the air inlet manifold and the ideal gas state equation.
In one possible implementation, the manifold pressure model derived by the torque module is referenced, and the manifold pressure model is a function of throttle opening, temperature of gas in the intake manifold, charge efficiency, and boost pressure.
In a possible implementation manner, the fault early warning module is further used for determining whether to carry out fault early warning or not according to the actual torque and the reference torque,
acquiring torque deviation according to the actual torque and the reference torque;
after the torque deviation exceeds the allowable deviation, obtaining residual deviation according to the difference value of the torque deviation and the allowable deviation;
and determining whether to carry out fault early warning or not according to the residual deviation.
In one possible implementation, the fault pre-warning module is further configured to determine whether to perform fault pre-warning according to the remaining deviation,
integrating the residual deviation to obtain an integral value;
and when the integral value is larger than the fault threshold value, carrying out fault early warning.
In one possible implementation, the fault pre-warning module is further configured to, when the integral value is greater than the fault threshold value, after performing the fault pre-warning,
continuously acquiring the running time of the engine after fault early warning is carried out;
and when the running time is longer than the preset time, triggering the vehicle speed limiting protection.
Fig. 6 is a hardware configuration diagram of a monitoring apparatus for engine torque according to an embodiment of the present application.
As shown in fig. 6, the engine torque monitoring apparatus 600 includes:
a processor 601 and a memory 602;
the memory 602 stores computer-executable instructions;
the processor executes computer-executable instructions stored by the memory 602 to cause the electronic device to perform the engine torque monitoring method described above.
For a specific implementation process of the processor 601, reference may be made to the above method embodiments, which implement the principle and the technical effect similarly, and details of this embodiment are not described herein again.
The embodiment of the present application also provides a computer-readable storage medium, in which computer-executable instructions are stored, and when the computer-executable instructions are executed by a processor, the method for monitoring engine torque is implemented as described above.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (10)
1. A method of monitoring engine torque, comprising:
acquiring actual torque of an engine according to a first stroke air inflow of the engine and the rotating speed of the engine, wherein the first stroke air inflow is the air inflow per stroke determined according to the pressure of an intake manifold;
acquiring reference torque of the engine according to a second stroke air inflow of the engine and the rotating speed of the engine, wherein the second stroke air inflow is the air inflow per stroke determined according to an ideal gas state equation and a manifold pressure model;
and determining whether to carry out fault early warning according to the actual torque and the reference torque, wherein the fault early warning is used for indicating that the actual torque of the engine is unreasonable.
2. The method according to claim 1, wherein before the obtaining of the actual torque of the engine based on the first stroke intake air amount of the engine and the rotation speed of the engine, the method further comprises:
acquiring fresh air intake quantity of each stroke, residual mass of exhaust gas inside each stroke and backflow mass of exhaust gas inside each stroke; wherein the fresh air intake per stroke is determined by intake manifold pressure;
and according to the fresh air intake quantity of each stroke, subtracting the residual mass of the exhaust gas in each stroke and the backflow mass of the exhaust gas in each stroke to obtain the first stroke air intake quantity.
3. The method according to claim 1, wherein before the reference torque of the engine is obtained based on the intake air amount for the second stroke of the engine and the rotation speed of the engine, the method further comprises:
obtaining the pressure of an intake manifold model according to the opening of a throttle valve and the manifold pressure model;
and obtaining the second stroke air inflow according to the model pressure of the intake manifold, the displacement of the engine, the temperature of the air in the intake manifold and the ideal gas state equation.
4. The method of claim 3, wherein the manifold pressure model is a function of the throttle opening, a temperature of gas in the intake manifold, a charging efficiency, and a boost pressure.
5. The method of claim 1, wherein determining whether to perform fault warning based on the actual torque and the reference torque comprises:
acquiring a torque deviation according to the actual torque and the reference torque;
after the torque deviation exceeds the allowable deviation, obtaining a residual deviation according to the difference value of the torque deviation and the allowable deviation;
and determining whether to carry out fault early warning or not according to the residual deviation.
6. The method of claim 5, wherein determining whether to perform fault pre-warning based on the residual deviation comprises:
integrating the residual deviation to obtain an integral value;
and when the integral value is larger than a fault threshold value, carrying out fault early warning.
7. The method of claim 6, wherein after performing a fault pre-warning when the integrated value is greater than a fault threshold, the method further comprises:
continuously acquiring the running time of the engine after fault early warning is carried out;
and when the running time is longer than the preset time, triggering vehicle speed limiting protection.
8. An engine torque monitoring apparatus comprising:
the actual torque module is used for obtaining the actual torque of the engine according to the first stroke air inflow of the engine and the rotating speed of the engine, wherein the first stroke air inflow is the air inflow per stroke determined according to the pressure of an intake manifold;
the reference torque module is used for obtaining reference torque of the engine according to second stroke air inflow of the engine and the rotating speed of the engine, wherein the second stroke air inflow is the air inflow per stroke determined according to an ideal gas state equation and a manifold pressure model;
and the fault early warning module is used for determining whether fault early warning is carried out or not according to the actual torque and the reference torque, and the fault early warning is used for indicating that the actual torque of the engine is unreasonable.
9. An electronic device, comprising: a processor, and a memory communicatively coupled to the processor;
the memory stores computer-executable instructions;
the processor executes computer-executable instructions stored by the memory to implement the method of any of claims 1 to 7.
10. A computer readable storage medium having computer executable instructions stored thereon for implementing the engine torque monitoring apparatus method of any one of claims 1 to 7 when executed by a processor.
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| CN117932941A (en) * | 2024-01-29 | 2024-04-26 | 北京电子科技职业学院 | Deviation correction method and system based on torque prediction model |
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