CN117967463A - Method, apparatus, electronic device, and storage medium for controlling engine - Google Patents
Method, apparatus, electronic device, and storage medium for controlling engine Download PDFInfo
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Abstract
Embodiments of the present application disclose a method, apparatus, electronic device, and storage medium for controlling an engine, the method comprising: carrying out working condition identification on the engine to obtain a working condition identification result; acquiring the intensity of the oscillating wave of the air inlet of the engine under the condition that the condition identification result is that the surge condition is identified; determining whether a surge marker bit exists according to the intensity of the oscillating wave; under the condition that the existence of a surge zone bit is determined, acquiring the required torque of an engine gas circuit and the required torque of the engine gas circuit; and respectively controlling the engine gas circuit and the engine fire circuit according to the engine gas circuit required torque and the engine fire circuit required torque. Therefore, the engine gas circuit and the engine fire circuit are controlled through the engine gas circuit required torque and the engine fire circuit required torque respectively, the problem of battery overshoot during anti-surge control of the supercharger can be solved, and an air inlet pressure relief valve is not required to be additionally arranged when the supercharger is arranged, so that the cost can be prevented from being reduced.
Description
Technical Field
The present application relates to the field of hybrid electric vehicle control, and in particular, to a method, an apparatus, an electronic device, and a computer-readable storage medium for controlling an engine.
Background
Currently, extended range vehicles have become increasingly popular in the life of the public. The running mode of the range-extending vehicle can work in a pure electric mode, a range-extending mode or a hybrid power mode according to requirements, the existing range-extending vehicle and the traditional fuel vehicle are provided with a supercharged engine, the supercharged engine comprises an engine and a supercharger, and the output power of the engine is improved through the supercharger; under the condition that the load of the supercharged engine is identified to be rapidly reduced, the throttle valve is rapidly closed, at the moment, the inlet air pressure in front of the throttle valve is instantaneously increased to cause the increase of the compressor pressure ratio, and the supercharged engine can easily enter a compressor surge area with low flow and high pressure ratio, so that the problems of noise, supercharger surge and the like can be caused.
Currently, in the related art, when a supercharged engine is equipped with a supercharger, an air inlet pressure relief valve is usually additionally arranged to drain excessive air, or a throttle valve is closed in a torque reducing mode, so that the surge of the supercharger is prevented; however, the anti-surge mode of adding the intake pressure relief valve can cause cost increase, and the anti-surge mode of reducing torque can easily cause the engine to output excessive torque, thereby causing the problem of battery overshoot; it is difficult to solve the problem of battery overshooting due to anti-surge control of the supercharger while reducing the cost of the anti-surge control.
Disclosure of Invention
To solve the above technical problems, embodiments of the present application provide a method, apparatus, electronic device, and computer-readable storage medium for controlling an engine, so as to solve the problem of battery overshoot due to anti-surge control of a supercharger, while reducing the cost of the anti-surge control.
According to an aspect of an embodiment of the present application, there is provided a method for controlling an engine, including: carrying out working condition identification on the engine to obtain a working condition identification result; acquiring the intensity of the oscillating wave of the air inlet of the engine under the condition that the condition identification result is that the surge condition is identified; determining whether a surge zone bit exists according to the intensity of the oscillating wave; under the condition that the surge zone bit exists, acquiring the engine gas circuit required torque and the engine gas circuit required torque; and respectively controlling the engine gas circuit and the engine fire circuit according to the engine gas circuit required torque and the engine fire circuit required torque.
In some embodiments, the engine is subjected to working condition recognition to obtain a working condition recognition result, including: acquiring the rotation speed of an engine; detecting an accelerator state under the condition that the engine speed is greater than a preset idle speed threshold; and under the condition that the throttle state is detected to be in a preset throttle loss state, determining the working condition recognition result to be that a surge working condition is recognized.
In some embodiments, obtaining the oscillatory wave intensity of engine intake includes: acquiring the post-pressurization temperature and the post-pressurization pressure of a preset detection point; determining an air state parameter from the post-boost temperature and the post-boost pressure; the air state parameters include a gas insulation index and a gas constant; filtering the boosted pressure by using a preset band-pass filter to obtain a pulsating pressure, and filtering the boosted pressure by using a preset low-pass filter to obtain an average pressure; carrying out peak detection on the pulsating pressure to obtain a pulsating pressure peak curve, and determining a pressurized gas parameter according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters comprise the speed of sound of the pressurized gas and the density of the pressurized gas; and determining the intensity of the oscillating wave according to the peak pulsation pressure curve, the velocity of sound of the pressurized gas and the density of the pressurized gas.
In some embodiments, obtaining the oscillatory wave intensity of engine intake includes: acquiring the post-supercharging temperature, post-supercharging pressure and air inlet flow of a preset detection point; determining an air state parameter from the post-boost temperature and the post-boost pressure; the air state parameters include a gas insulation index and a gas constant; filtering the air inlet flow by using a preset band-pass filter to obtain pulsating flow, and filtering the boosted pressure by using a preset low-pass filter to obtain average pressure; carrying out peak detection on the pulsating flow to obtain a pulsating flow peak curve, and determining a pressurized gas parameter according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters comprise the speed of sound of the pressurized gas and the density of the pressurized gas; and determining the intensity of the oscillating wave according to the peak pulsation flow curve, the velocity of sound of the pressurized gas and the density of the pressurized gas.
In some embodiments, determining whether a surge flag is present based on the oscillating wave intensity comprises: detecting the intensity of the oscillating wave in real time under the condition that the intensity of the oscillating wave is in a preset threshold range; and under the condition that the intensity of the oscillating wave exceeds a preset threshold value, determining that a surge zone bit exists.
In some embodiments, obtaining the engine gas circuit demand torque and the engine gas circuit demand torque includes: judging a vehicle battery to obtain a judging result; acquiring the current required torque of the engine under the condition that the vehicle battery is full, or the ambient temperature of the vehicle battery is lower than the preset temperature, or the vehicle battery has a fault; and decoupling the current required torque to obtain the required torque of the engine gas circuit and the required torque of the engine fire circuit.
In some embodiments, controlling the engine gas circuit and the engine fire circuit according to the engine gas circuit demand torque and the engine fire circuit demand torque, respectively, includes: determining a throttle closing speed according to the engine gas circuit required torque, and determining an oil injection quantity and an ignition angle according to the engine gas circuit required torque; the throttle closing speed is lower than a preset speed threshold; and controlling the throttle valve to be closed according to the throttle valve closing speed so as to enable the air inflow to slowly decrease, controlling the fuel injector according to the fuel injection quantity so as to reduce the fuel injection quantity, and controlling the ignition advance angle to withdraw according to the ignition angle so as to enable the engine output torque to rapidly decrease.
According to an aspect of an embodiment of the present application, there is provided an apparatus for controlling an engine, including: the working condition identification module is configured to identify the working condition of the engine to obtain a working condition identification result; the first acquisition module is configured to acquire the intensity of the oscillating wave of the engine air intake under the condition that the condition identification result is that the surge condition is identified; a determining module configured to determine whether a surge flag bit exists according to the oscillating wave intensity; the second acquisition module is configured to acquire the engine gas circuit required torque and the engine gas circuit required torque under the condition that the existence of the surge zone bit is determined; and the control module is configured to control the engine gas circuit and the engine fire circuit according to the engine gas circuit required torque and the engine fire circuit required torque respectively.
According to an aspect of an embodiment of the present application, there is provided an electronic device including one or more processors; and a storage means for storing one or more programs which, when executed by the one or more processors, cause the electronic device to implement the method for controlling an engine as described above.
According to an aspect of an embodiment of the present application, there is provided a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements a method for controlling an engine as above.
According to the technical scheme provided by the embodiment of the application, the engine gas circuit can be controlled by the torque required by the engine gas circuit to realize indirect throttle control, so that the surge of the supercharger is avoided, and the actual output torque of the engine can be limited by controlling the engine gas circuit by the torque required by the engine gas circuit, so that the engine can not output excessive torque, the problem of battery overshoot when the anti-surge control is carried out on the supercharger is solved, and an air inlet pressure relief valve is not required to be additionally arranged when the supercharger is arranged, so that the cost can be prevented from being reduced. Therefore, the problem of battery overshoot when the anti-surge control is performed on the supercharger is solved, and meanwhile, the cost of the anti-surge control is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 is a schematic diagram of an extended range engine according to an exemplary embodiment of the present application;
FIG. 2 is a schematic diagram illustrating a method for controlling an engine according to an exemplary embodiment of the present application;
FIG. 3 is a flowchart of a method of acquiring the oscillatory wave intensity of engine intake in an exemplary embodiment at step S220 in the embodiment of FIG. 2;
FIG. 4 is a flowchart of a method of acquiring the oscillatory wave intensity of engine intake in another exemplary embodiment at step S220 in the embodiment shown in FIG. 2;
FIG. 5 is a flowchart of a method of obtaining engine gas circuit demand torque and engine gas circuit demand torque in an exemplary embodiment at step S240 in the embodiment of FIG. 2
FIG. 6 is a schematic structural view of an apparatus for controlling an engine according to an exemplary embodiment of the present application;
fig. 7 is a schematic structural view of a hybrid vehicle according to an exemplary embodiment of the present application.
Reference numerals:
1: an engine; 2: a throttle valve; 3: a supercharger; 4: an intercooler; 5: a generator; 6: a vehicle battery.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations identical to the present application. Rather, they are merely examples of apparatus and methods that are identical to some aspects of the present application as detailed in the appended claims.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in the form of an application program or in one or more hardware modules or integrated circuits or in different network and/or processor devices and/or microcontroller devices.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
In the present application, the term "plurality" means two or more. "and/or" describes an association relationship of an association object, meaning that there may be three relationships, e.g., a and/or B may represent: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
The embodiment of the application provides a method for controlling an engine, which can be applied to a hybrid electric vehicle provided with an extended-range engine and can be realized by electronic equipment in the hybrid electric vehicle.
The electronic device includes, but is not limited to, a tablet computer (Tablet Personal Computer), a personal computer (Personal Computer), or an in-vehicle terminal. In this embodiment, the electronic device may be a vehicle-mounted terminal
The vehicle-mounted terminal can be a processor, a memory and other components. The processor includes an EMS (ENGINE MANAGEMENT SYSTEM ), a VCU (Vehicle control unit, vehicle controller) and an ECU (Electronic Control Unit, electronic controller unit). The processor can be used for identifying the working condition of the engine and obtaining a working condition identification result; the method comprises the steps of obtaining the intensity of oscillation waves of air inlet of an engine, determining whether a surge zone exists according to the intensity of the oscillation waves, and obtaining the required torque of an engine air circuit and the required torque of an engine fire circuit under the condition that the surge zone exists is determined, so that the engine air circuit and the engine fire circuit are controlled according to the required torque of the engine air circuit and the required torque of the engine fire circuit respectively. The memory may be NVM (non-volatile memory), flash (Flash memory), etc., and may be used to store air state parameters, such as gas insulation index and gas constant, and may also be used to store a preset relationship table, where the preset relationship table stores a correspondence between the engine gas path required torque and the valve closing speed, and a correspondence between the engine gas path required torque, the fuel injection amount, and the ignition angle.
Referring to fig. 1, fig. 1 is a schematic diagram of an extended range engine according to an exemplary embodiment of the present application, and as shown in fig. 1, the engine includes an engine 1, a throttle valve 2, a supercharger 3, an intercooler 4, a generator 5, and a vehicle battery 6. The supercharger 3 comprises a turbine and a compressor, the turbine of the supercharger 3 is arranged on the engine 1, the compressor of the supercharger 3 is connected with the intercooler 4, the intercooler 4 is connected with the throttle valve 2, and the throttle valve 2 is connected with the engine 1; the engine 1 and the generator 5 are coupled by a mechanical structure, the generator 5 being connected with a vehicle battery 6. In the embodiment of the application, the engine 1 is an internal combustion engine, the throttle valve 2 is an electronic throttle valve, the supercharger 3 is a turbocharger, and the intercooler 4 is an air intercooler or a water air cooler. The generator 5 is a permanent magnet synchronous generator, and the vehicle battery 6 is a power battery.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for controlling an engine according to an exemplary embodiment of the present application.
The method for controlling the engine according to the embodiment of the present application is described in detail below with the vehicle-mounted terminal as a specific execution body.
As shown in fig. 2, in an exemplary embodiment, the method for controlling an engine includes at least steps S210 to S250, which are described in detail as follows:
step S210, carrying out working condition recognition on the engine to obtain a working condition recognition result.
In the embodiment of the application, before the working condition identification is performed on the engine, the method further comprises the following steps: under the condition that the power-on of the vehicle is detected, the vehicle-mounted terminal carries out self-detection through the EMS, and alarms are given if abnormal conditions exist; the self-checking object comprises sensors and actuators of various systems of the engine, such as individual sensors and actuators which report faults in the self-checking process, and the fault can possibly relate to the fact that follow-up control cannot be normally performed, if the engine cannot enter a normal working state, the EMS reports the faults, the engine is limited to be twisted, and the engine is prevented from reaching higher power in an unexpected state to cause more serious mechanical damage. And if the self-check is all normal, identifying the working condition of the engine to obtain a working condition identification result.
The condition identification results include identifying a surge condition and not identifying a surge condition.
Step S220, when the condition recognition result is that the surge condition is recognized, the intensity of the oscillating wave of the air intake of the engine is obtained. Wherein the oscillating wave intensity is used to characterize the wave intensity of the surge oscillations.
In the embodiment of the application, the intensity of the oscillating wave can be calculated according to the pressure after supercharging, and the intensity of the oscillating wave can also be calculated according to the air inlet flow and the pressure after supercharging.
The signal-to-noise ratio is better and thus more sensitive when the oscillating wave intensity is calculated by the intake air flow rate and the post-supercharging pressure, so that the accuracy of the calculated oscillating wave intensity can be improved.
Step S230, determining whether a surge zone bit exists according to the intensity of the oscillating wave.
The embodiment of the application is provided with a preset threshold range, wherein the preset threshold range comprises a lower limit value L and an upper limit value U; whether the actual surge occurs due to the throttle valve being closed or not can be determined by judging whether the oscillating wave intensity is within a preset threshold range.
Step S240, under the condition that the surge zone bit exists, the engine gas circuit required torque and the engine gas circuit required torque are obtained.
It will be appreciated that in the event that a surge flag is detected, the supercharger is deemed to be in surge at this time, and the engine gas circuit demand torque is used to control the supercharger to not surge by dividing the vehicle demand torque into an engine gas circuit demand torque and an engine gas circuit demand torque, the engine gas circuit demand torque being used to cope with a reduction in demand torque so that the actual engine output torque is rapidly reduced to the vehicle demand torque.
And step S250, controlling the engine gas circuit and the engine fire circuit according to the engine gas circuit required torque and the engine fire circuit required torque respectively.
Because the air inlet pressure relief valve is not arranged in the application, the air inlet pressure relief valve can be realized only by slowly closing the throttle valve in order to ensure that the supercharger does not surge, and the aim of controlling the engine air path according to the torque required by the engine air path is to ensure that the throttle valve is slowly closed to avoid the surge of the supercharger. The purpose of controlling the engine spark based on the engine spark demand torque is to allow the engine torque output to drop rapidly to accommodate the demand torque.
In some embodiments, the engine is subjected to working condition recognition to obtain a working condition recognition result, including: acquiring the rotation speed of an engine; detecting an accelerator state under the condition that the engine speed is greater than a preset idle speed threshold; and under the condition that the throttle state is detected to be in a preset throttle loss state, determining the working condition recognition result to be that the surge working condition is recognized.
In the embodiment of the application, the preset throttle loss state is a Tip out (fast throttle receiving) state.
When the working condition of the engine is identified, the VCU in the vehicle-mounted terminal needs to judge the throttle state first. The accelerator state can be generally classified into a Tip in (rapid accelerator pedal) state, a Tip out (rapid accelerator pedal) state, and a steady state. When the throttle state is the Tip in state, the engine required torque can be increased, and at the moment, the throttle valve can be rapidly opened to increase the air inflow so as to ensure the required torque. When the throttle state is the Tip out state, the torque required by the engine can be reduced, and at the moment, the throttle valve is conventionally closed to reduce the air inflow reducing torque, so that the surge of the supercharger can be easily caused in the process, and the compressor is very large in front-rear pressure ratio and very small in flow after the throttle valve is closed, so that the compressor can easily touch a surge line to cause the surge of the supercharger and the increase of noise. Various parameters of the engine will remain stable when the throttle is stationary. Therefore, the vehicle-mounted terminal needs to firstly judge whether the rotation speed of the engine is higher than a preset idle speed threshold value through the EMS, if not, the engine is considered to be in a starting state or a flameout state, and no additional processing is needed.
If the rotation speed of the engine is greater than a preset idle speed threshold, the engine is considered to work normally at the moment, the vehicle-mounted terminal judges the state of the accelerator through the EMS, and when the VCU detects that the accelerator is in a Tip in state or a stable state, the vehicle-mounted terminal controls the torque output flow direction of the engine through the VCU to generate power for the generator, and the power generated by the generator can drive the vehicle to advance or charge a battery of the vehicle according to the current state of the vehicle under the control of the VCU.
In some embodiments, obtaining the oscillatory wave intensity of engine intake includes: acquiring the post-pressurization temperature and the post-pressurization pressure of a preset detection point; determining an air state parameter according to the post-pressurization temperature and the post-pressurization pressure; the air state parameters include a gas insulation index and a gas constant; filtering the boosted pressure by using a preset band-pass filter to obtain pulsating pressure, and filtering the boosted pressure by using a preset low-pass filter to obtain average pressure; peak value detection is carried out on the pulsation pressure, a pulsation pressure peak value curve is obtained, and the pressurized gas parameters are determined according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters include the speed of sound of the pressurized gas and the density of the pressurized gas; and determining the intensity of the oscillating wave according to the peak pulsation pressure curve, the velocity of sound of the pressurized gas and the density of the pressurized gas.
It is understood that a plurality of sensors, such as a temperature sensor and a pressure sensor, are provided in the vehicle; the vehicle-mounted terminal detects the post-pressurization temperature of the preset detection point through the temperature sensor, and detects the post-pressurization pressure of the preset detection store through the pressure sensor. In the embodiment of the application, the preset detection point is arranged on a pipeline between the compressor and the engine.
Further, determining the air state parameter based on the post-boost temperature and the post-boost pressure includes: matching air state parameters which correspond to the temperature after pressurization and the pressure after pressurization together from a preset database according to the temperature after pressurization and the pressure after pressurization; the preset database stores the corresponding relation among the temperature after pressurization, the pressure after pressurization and the air state parameter. Wherein the air state parameters include a gas insulation index and a gas constant.
In the embodiment of the application, because the throttle state is a Tip out (quick throttle closing) state, the throttle valve and the throttle valve of the engine are in a linkage state, the throttle valve opening becomes smaller, so that the pressure after supercharging is in an unstable state, the pressure after supercharging can be approximately a first harmonic wave, and the amplitude of P0 surrounds the sinusoidal change of the average pressure; p0 is a pulsating pressure peak value curve, and the pulsating pressure is obtained by filtering treatment through a band-pass filter, so that the pulsating pressure peak value curve is obtained. The frequency ranges of the band pass filters are (the frequency of f 1,f2).f1 and f 2 can be given according to the frequency f when the engine is in surge, and f 1＜f＜f2 and f are the surge frequencies of the engine.
The low-pass filter is used for filtering the post-pressure, clutter, such as high-frequency harmonic waves, in the post-pressure can be filtered, so that average pressure is obtained, and the sound velocity and the post-pressure gas density of the pressurized gas can be calculated according to the average pressure and the air state parameters.
Further, peak detection is performed on the pulsating pressure to obtain a pulsating pressure peak curve, including: and carrying out peak detection according to the preset detection window length and the preset smoothing time to obtain a pulsation pressure peak curve. The length of a preset detection window is Tw, tw is more than or equal to 1/f, and f is the preset surge frequency; the preset smoothing time is tau, 0 < tau < 100ms. Detecting peaks requires attenuating asymmetric signals, such as non-oscillating engine dynamic signals in a bandpass.
The vehicle-mounted terminal performs peak detection on the pulsating pressure through a preset peak detector, wherein the peak detection window length is Tw, and performs smoothing by adopting a smoothing time tau to obtain a pulsating pressure peak curveWherein/>Is the pulsating pressure, t is the time.
Further, the post-boost gas parameters include post-boost gas sound velocity and post-boost gas density; determining the pressurized gas parameter from the average pressure, the gas insulation index, and the gas constant, comprising: by calculation ofAnd calculatingObtaining the velocity of sound and the density of the pressurized gas; wherein ρ is the gas density after pressurization,/>R is the gas constant, and T is the temperature after pressurization; c is the gas density after pressurization, and gamma is the gas insulation index.
Further, determining the oscillatory wave intensity from the pulsatile pressure peak profile, the post-boost gas sound velocity, and the post-boost gas density comprises: by calculation ofObtaining the intensity of an oscillating wave; wherein I is the intensity of the shock wave, ρ is the density of the pressurized gas, c is the density of the pressurized gas, and P 0 is the peak curve of the pulsating pressure.
In some embodiments, obtaining the oscillatory wave intensity of engine intake includes: acquiring the post-supercharging temperature, post-supercharging pressure and air inlet flow of a preset detection point; determining an air state parameter according to the post-pressurization temperature and the post-pressurization pressure; the air state parameters include a gas insulation index and a gas constant; filtering the air inlet flow by using a preset band-pass filter to obtain pulsating flow, and filtering the boosted pressure by using a preset low-pass filter to obtain average pressure; peak detection is carried out on the pulsating flow to obtain a pulsating flow peak curve, and the pressurized gas parameters are determined according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters include the speed of sound of the pressurized gas and the density of the pressurized gas; and determining the intensity of the oscillating wave according to the peak pulsation flow curve, the velocity of sound of the pressurized gas and the density of the pressurized gas.
In the embodiment of the application, because the signal to noise is better when the air inflow is used, the air inflow is used as input to calculate the intensity of the oscillating wave and judge the threshold range, and compared with the pressure after the pressure is boosted, the pressure is more sensitive.
Further, the post-boost gas parameters include post-boost gas sound velocity and post-boost gas density; determining the oscillatory wave intensity from the pulsatile flow peak profile, the post-boost gas sound velocity, and the post-boost gas density, comprising: by calculation ofObtaining the intensity of an oscillating wave; wherein I is the intensity of the shock wave, ρ is the density of the gas after pressurization, c is the density of the gas after pressurization, M 0 is the peak curve of the pulsating flow, and A is the cross-sectional area of a preset detection point.
In some embodiments, determining whether a surge flag is present based on the oscillating wave intensity includes: detecting the intensity of the oscillating wave in real time under the condition that the intensity of the oscillating wave is in a preset threshold range; and if the detected oscillating wave intensity exceeds the preset threshold value, determining that a surge zone bit exists. Therefore, by detecting the intensity of the oscillating wave in real time, when the surge zone bit is determined to exist, the engine gas circuit control and the fire circuit control can be conveniently and timely performed.
In the embodiment of the application, the preset threshold range is (L, U), L is the lower limit value of the preset threshold range, and U is the upper limit value of the preset threshold range.
For example, in the case that the oscillating wave intensity is within the preset threshold value range, detecting whether the oscillating wave intensity exceeds the preset threshold value in real time within a preset time period; the preset threshold is the upper limit value of the preset threshold range. If the detected oscillating wave intensity exceeds a preset threshold value, determining that a surge zone bit exists; if the intensity of the oscillation wave is detected not to exceed the preset threshold value, continuing to detect.
In some embodiments, obtaining the engine gas circuit demand torque and the engine gas circuit demand torque includes: judging a vehicle battery to obtain a judging result; acquiring the current required torque of the engine under the condition that the vehicle battery is full, or the ambient temperature of the vehicle battery is lower than the preset temperature, or the vehicle battery has a fault; and decoupling the current required torque to obtain the required torque of the engine gas circuit and the required torque of the engine fire circuit.
In the embodiment of the application, the current required torque of the engine can be obtained by monitoring the throttle depth. For example, under the condition that the change of the accelerator depth is detected, the accelerator depth is obtained, and the current required torque corresponding to the accelerator depth is matched from a preset database; the corresponding relation between the throttle depth and the current required torque is stored in a preset database.
For example, after the surge flag bit is determined, the impending surge needs to be dealt with, and at this time, the battery power, the ambient temperature and the battery state are detected through the vehicle terminal so as to determine whether the engine torque can be decoupled by charging the vehicle battery, and the vehicle battery is used for absorbing the excessive engine power caused by slow closing of the intake valve, so that the fuel consumption of the engine can be reduced. If the battery is not full of electricity, the ambient temperature is proper, and the battery state is good at the moment, the vehicle-mounted terminal controls the throttle valve to be slowly closed through the EMS, and simultaneously controls the engine to charge the battery through the VCU, so that the surge of the supercharger is avoided.
After the surge zone bit is determined, if the battery is in a full-power state or the battery state is abnormal, or the ambient temperature is low, the battery charging is limited, the VCU is used for telling the ECU to divide the engine required torque into the engine gas path required torque and the engine fire path required torque, the engine gas path required torque is used for controlling the supercharger to not surge, and the engine fire path required torque is used for coping with the reduction of the VCU torque requirement, so that the actual output torque of the engine is quickly reduced to the engine required torque.
Because the air inlet pressure relief valve is not additionally arranged in the embodiment of the application for reducing the cost, the air inlet pressure relief valve can only be realized by slowly closing the throttle valve in order to ensure that the supercharger does not surge, namely, the throttle valve is controlled to be closed at a speed lower than a preset threshold value; therefore, the purpose of the gas circuit torque control is to enable the throttle valve to be slowly closed so as to avoid the surge of the supercharger. The control of the spark torque is to make the engine torque output drop quickly to adapt to the engine demand torque, which is realized by reducing the engine fuel injection quantity and the back ignition advance angle.
In some embodiments, controlling the engine gas circuit and the engine fire circuit according to the engine gas circuit demand torque and the engine fire circuit demand torque, respectively, includes: determining a throttle closing speed according to the engine gas path required torque, and determining an oil injection quantity and an ignition angle according to the engine gas path required torque; the throttle closing speed is lower than a preset speed threshold; the throttle valve closing is controlled in accordance with the throttle valve closing speed so that the intake air amount is slowly decreased, and the injector is controlled in accordance with the injection amount so as to reduce the injection amount, and the ignition advance angle relief angle is controlled in accordance with the ignition angle so that the engine output torque is rapidly decreased.
Further, determining a throttle closing speed based on the engine gas path demand torque includes: matching a throttle closing speed corresponding to the engine gas circuit required torque from a preset database; the corresponding relation between the engine gas circuit required torque and the throttle closing speed is stored in a preset database. In the embodiment of the application, when the closing speed of the throttle valve is lower than the preset speed threshold, the throttle valve is regarded as being slowly closed, so that the surge of the supercharger can be avoided.
Referring to fig. 3, fig. 3 is a flowchart of a method for acquiring the oscillating wave intensity of engine intake air in an exemplary embodiment in step S220 in the embodiment shown in fig. 2, and includes at least steps S310 to S350, which are described in detail below:
Step S310, obtaining the post-pressurization temperature and the post-pressurization pressure of the preset detection point.
Step S320, determining air state parameters according to the post-pressurization temperature and the post-pressurization pressure; the air state parameters include a gas insulation index and a gas constant.
Step S330, filtering the boosted pressure by using a preset band-pass filter to obtain a pulsating pressure, and filtering the boosted pressure by using a preset low-pass filter to obtain an average pressure.
Step S340, carrying out peak detection on the pulsating pressure to obtain a pulsating pressure peak curve, and determining the pressurized gas parameters according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters include the speed of sound of the pressurized gas and the density of the pressurized gas.
Step S350, determining the intensity of the oscillating wave according to the peak curve of the pulsating pressure, the velocity of sound of the gas after pressurization and the density of the gas after pressurization.
In the embodiment of the application, the pressure after pressurization is directly used as input to perform threshold calculation, so that the intensity of the oscillating wave can be directly calculated.
Referring to fig. 4, fig. 4 is a flowchart of a method for acquiring the oscillating wave intensity of engine intake air in another exemplary embodiment at step S220 in the embodiment shown in fig. 2, and includes at least steps S410 to S450, which are described in detail below:
Step S410, obtaining the post-boost temperature, post-boost pressure and intake air flow at the preset detection point.
Step S420, determining air state parameters according to the post-pressurization temperature and the post-pressurization pressure; the air state parameters include a gas insulation index and a gas constant.
Step S430, filtering the intake air flow by using a preset band-pass filter to obtain a pulsating flow, and filtering the boosted pressure by using a preset low-pass filter to obtain an average pressure.
Step S440, carrying out peak detection on the pulsating flow to obtain a pulsating flow peak curve, and determining the pressurized gas parameters according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters include the speed of sound of the pressurized gas and the density of the pressurized gas.
Step S450, determining the intensity of the oscillating wave according to the peak curve of the pulsating flow, the velocity of sound of the pressurized gas and the density of the pressurized gas.
In the embodiment of the application, because the signal to noise is better when the air inflow is used, the air inflow is used as input to calculate the intensity of the oscillating wave and judge the threshold range, and compared with the pressure after the pressure is boosted, the pressure is more sensitive.
Referring to fig. 5, fig. 5 is a flowchart of a method for obtaining engine gas circuit demand torque and engine gas circuit demand torque in an exemplary embodiment in step S240 in the embodiment shown in fig. 2, and includes at least steps S501 to S510, which are described in detail below:
step S501, judging whether a vehicle system has a fault or not; in the event of a failure of the vehicle system, step S502 is executed; and/or, in the event that there is no failure of the vehicle system, step S503 is performed.
Step S502, performing speed and torque limiting on the engine. And then ends.
It can be understood that under the condition that the vehicle system has faults, the speed and torque of the engine are limited, so that the driving safety is conveniently ensured.
Step S503, judging whether the accelerator pedal of the vehicle is retracted; if the accelerator pedal of the vehicle is not retracted, step S504 is executed; and/or, in the case where the accelerator pedal of the vehicle is retracted, step S505 is executed.
Step S504, controlling the engine to normally ignite fuel injection. And then ends.
Step S505, judging whether a surge zone bit exists; in the absence of a surge flag, step S505 is performed; and/or, in the event that a surge flag is present, step S506 is performed.
Step S506, judging whether the vehicle battery is full, whether the ambient temperature of the vehicle battery is lower than a preset temperature, and whether the vehicle battery fails; if not, executing step S507; and/or, if any one of the three is yes, executing step S508.
And S507, controlling the throttle valve to be closed according to the speed lower than the preset speed threshold value, and controlling the engine to send out redundant power to charge the battery. And then ends.
According to the embodiment of the application, the throttle valve is controlled to be closed according to the speed lower than the preset speed threshold value, so that the throttle valve is slowly closed, the air inflow after supercharging is ensured to be reduced in a door changing manner, and the surge of the supercharger is avoided.
Step S508, the current required torque of the engine is obtained. Step S509 is then performed.
Step S509, filtering processing is performed on the current required torque. Step S510 is then performed.
Step S510, decoupling the current required torque after filtering processing to obtain the required torque of the engine gas circuit and the required torque of the engine fire circuit. Step S511 is then performed.
Step S511, the engine gas circuit and the engine fire circuit are controlled according to the engine gas circuit required torque and the engine fire circuit required torque respectively. Step S503 is then performed.
In the embodiment of the application, whether the surge occurs in the supercharger can be repeatedly detected by judging whether the accelerator pedal of the vehicle is retracted or not after the engine gas circuit and the engine fire circuit are respectively controlled, so that the surge can be avoided in time when the surge occurs. The method has the advantages that the range-extended vehicle is judged according to the vehicle battery state, the vehicle battery electric quantity, the ambient temperature and the like, the control strategy of slow closing of the throttle valve is realized, the required torque of the engine is divided into the required torque of the engine gas circuit and the required torque of the engine gas circuit, the purpose that the throttle valve is delayed to be closed is achieved due to the fact that the required torque of the engine gas circuit slowly drops, the pressure is smoothly reduced without continuous fluctuation after supercharging, the supercharging pressure ratio avoids a surge line area, the problem of compressor surge is effectively solved, meanwhile, the actual output torque of the engine is rapidly reduced, the electric quantity is not obviously increased, and the risk of battery overcharge is avoided.
There is also provided, in another exemplary embodiment of the present application, as shown in fig. 6, an apparatus for controlling an engine, including: the device comprises a working condition identification module 610, a first acquisition module 620, a determination module 630, a second acquisition module 640 and a control module 650; the working condition identification module 610 is configured to identify the working condition of the engine to obtain a working condition identification result; the first obtaining module 620 is configured to obtain an oscillating wave intensity of the engine intake air when the condition recognition result is that a surge condition is recognized; the determination module 630 is configured to determine whether a surge flag is present based on the oscillating wave intensity; the second acquisition module 640 is configured to acquire the engine gas circuit demand torque and the engine gas circuit demand torque if it is determined that the surge flag is present; the control module 650 is configured to control the engine gas circuit and the engine fire circuit, respectively, based on the engine gas circuit demand torque and the engine fire circuit demand torque.
Further, the condition identifying module 610 is configured to identify the condition of the engine by: acquiring the rotation speed of an engine; detecting an accelerator state under the condition that the engine speed is greater than a preset idle speed threshold; and under the condition that the throttle state is detected to be in a preset throttle loss state, determining the working condition recognition result to be that the surge working condition is recognized.
Further, the first acquisition module 620 is configured to acquire the oscillating wave intensity of the engine intake air by: acquiring the post-pressurization temperature and the post-pressurization pressure of a preset detection point; determining an air state parameter according to the post-pressurization temperature and the post-pressurization pressure; the air state parameters include a gas insulation index and a gas constant; filtering the boosted pressure by using a preset band-pass filter to obtain pulsating pressure, and filtering the boosted pressure by using a preset low-pass filter to obtain average pressure; peak value detection is carried out on the pulsation pressure, a pulsation pressure peak value curve is obtained, and the pressurized gas parameters are determined according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters include the speed of sound of the pressurized gas and the density of the pressurized gas; and determining the intensity of the oscillating wave according to the peak pulsation pressure curve, the velocity of sound of the pressurized gas and the density of the pressurized gas.
Further, the first acquisition module 620 is configured to acquire the oscillating wave intensity of the engine intake air by: acquiring the post-supercharging temperature, post-supercharging pressure and air inlet flow of a preset detection point; determining an air state parameter according to the post-pressurization temperature and the post-pressurization pressure; the air state parameters include a gas insulation index and a gas constant; filtering the air inlet flow by using a preset band-pass filter to obtain pulsating flow, and filtering the boosted pressure by using a preset low-pass filter to obtain average pressure; peak detection is carried out on the pulsating flow to obtain a pulsating flow peak curve, and the pressurized gas parameters are determined according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters include the speed of sound of the pressurized gas and the density of the pressurized gas; and determining the intensity of the oscillating wave according to the peak pulsation flow curve, the velocity of sound of the pressurized gas and the density of the pressurized gas.
Further, the determination module 630 is configured to determine whether a surge flag is present based on the oscillating wave intensity by: detecting the intensity of the oscillating wave in real time under the condition that the intensity of the oscillating wave is in a preset threshold range; and if the detected oscillating wave intensity exceeds the preset threshold value, determining that a surge zone bit exists.
Further, the second acquisition module 640 is configured to acquire the engine gas circuit demand torque and the engine gas circuit demand torque by: judging a vehicle battery to obtain a judging result; acquiring the current required torque of the engine under the condition that the vehicle battery is full, or the ambient temperature of the vehicle battery is lower than the preset temperature, or the vehicle battery has a fault; and decoupling the current required torque to obtain the required torque of the engine gas circuit and the required torque of the engine fire circuit.
Further, the control module 650 is configured to control the engine air circuit and the engine air circuit according to the engine air circuit demand torque and the engine air circuit demand torque, respectively, by: determining a throttle closing speed according to the engine gas path required torque, and determining an oil injection quantity and an ignition angle according to the engine gas path required torque; the throttle closing speed is lower than a preset speed threshold; the throttle valve closing is controlled in accordance with the throttle valve closing speed so that the intake air amount is slowly decreased, and the injector is controlled in accordance with the injection amount so as to reduce the injection amount, and the ignition advance angle relief angle is controlled in accordance with the ignition angle so that the engine output torque is rapidly decreased.
It should be noted that, the apparatus for controlling an engine provided in the foregoing embodiment and the method for controlling an engine provided in the foregoing embodiment belong to the same concept, and the specific manner in which each module and unit perform the operation has been described in detail in the method embodiment, which is not repeated herein. In practical applications, the device for controlling an engine provided in the above embodiment may be configured to distribute the functions according to needs, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above, which is not limited herein.
Referring to fig. 7, fig. 7 is a schematic view showing a structure of a hybrid vehicle according to an embodiment of the present application. As shown in fig. 7, the hybrid vehicle in the embodiment of the application includes a vehicle controller 700, and the vehicle controller 700 may include one or more of the following components: a processor 701, a memory 702, and one or more application programs. Wherein one or more application programs may be stored in the memory 702 and configured to be executed by the one or more processors 701, the one or more application programs being configured to perform the driving method of the hybrid vehicle as described in the foregoing method embodiments.
The processor 701 may include one or more processing cores. The processor 701 connects various parts of the entire hybrid vehicle using various interfaces and lines, performs various functions of the hybrid vehicle and processes data by running or executing instructions, programs, code sets, or instruction sets stored in the memory 702, and invoking data stored in the memory 702. Alternatively, the processor 701 may be implemented in at least one hardware form of digital signal Processing (DIGITAL SIGNAL Processing, DSP), field-Programmable gate array (Field-Programmable GATE ARRAY, FPGA), programmable logic array (Programmable Logic Array, PLA). The processor 701 may integrate one or a combination of several of a central processing unit (Central Processing Unit, CPU), an image processor (Graphics Processing Unit, GPU), a modem, etc. The CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for being responsible for rendering and drawing of display content; the modem is used to handle wireless communications. It will be appreciated that the modem may not be integrated into the processor 701 and may be implemented solely by a single communication chip.
Memory 702 may include random access Memory (Random Access Memory, RAM) or Read Only Memory (ROM). Memory 702 may be used to store instructions, programs, code, sets of codes, or instruction sets. The memory 702 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for implementing at least one function, instructions for implementing the various method embodiments described above, and the like. The stored data area may also store data created by the hybrid vehicle during use.
The embodiment of the application also provides electronic equipment, which comprises: one or more processors; and a memory for storing one or more programs that, when executed by the one or more processors, cause the electronic device to implement the methods for controlling an engine provided in the various embodiments described above.
The application also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor implements a network device flow control method as described above. The computer-readable storage medium may be included in the electronic device described in the above embodiment or may exist alone without being incorporated in the electronic device.
It should be noted that, the computer readable storage medium according to the embodiment of the present application may include, but is not limited to: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-Only Memory (ROM), an erasable programmable read-Only Memory (Erasable Programmable Read Only Memory, EPROM), a flash Memory, an optical fiber, a portable compact disc read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer program embodied on a computer readable storage medium may be transmitted using any appropriate medium, including but not limited to: wireless, wired, etc., or any suitable combination of the foregoing.
The foregoing is merely illustrative of the preferred embodiments of the present application and is not intended to limit the embodiments of the present application, and those skilled in the art can easily make corresponding variations or modifications according to the main concept and spirit of the present application, so that the protection scope of the present application shall be defined by the claims.
Claims (10)
1. A method for controlling an engine, comprising:
carrying out working condition identification on the engine to obtain a working condition identification result;
acquiring the intensity of the oscillating wave of the air inlet of the engine under the condition that the condition identification result is that the surge condition is identified;
determining whether a surge zone bit exists according to the intensity of the oscillating wave;
under the condition that the surge zone bit exists, acquiring the engine gas circuit required torque and the engine gas circuit required torque;
And respectively controlling the engine gas circuit and the engine fire circuit according to the engine gas circuit required torque and the engine fire circuit required torque.
2. The method of claim 1, wherein the engine is subjected to condition recognition to obtain a condition recognition result, comprising:
Acquiring the rotation speed of an engine;
detecting an accelerator state under the condition that the engine speed is greater than a preset idle speed threshold;
and under the condition that the throttle state is detected to be in a preset throttle loss state, determining the working condition recognition result to be that a surge working condition is recognized.
3. The method of claim 1, wherein obtaining the oscillatory wave intensity of the engine intake air comprises:
acquiring the post-pressurization temperature and the post-pressurization pressure of a preset detection point;
Determining an air state parameter from the post-boost temperature and the post-boost pressure; the air state parameters include a gas insulation index and a gas constant;
Filtering the boosted pressure by using a preset band-pass filter to obtain a pulsating pressure, and filtering the boosted pressure by using a preset low-pass filter to obtain an average pressure;
carrying out peak detection on the pulsating pressure to obtain a pulsating pressure peak curve, and determining a pressurized gas parameter according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters comprise the speed of sound of the pressurized gas and the density of the pressurized gas;
and determining the intensity of the oscillating wave according to the peak pulsation pressure curve, the velocity of sound of the pressurized gas and the density of the pressurized gas.
4. The method of claim 1, wherein obtaining the oscillatory wave intensity of the engine intake air comprises:
acquiring the post-supercharging temperature, post-supercharging pressure and air inlet flow of a preset detection point;
Determining an air state parameter from the post-boost temperature and the post-boost pressure; the air state parameters include a gas insulation index and a gas constant;
filtering the air inlet flow by using a preset band-pass filter to obtain pulsating flow, and filtering the boosted pressure by using a preset low-pass filter to obtain average pressure;
Carrying out peak detection on the pulsating flow to obtain a pulsating flow peak curve, and determining a pressurized gas parameter according to the average pressure, the gas insulation index and the gas constant; the pressurized gas parameters comprise the speed of sound of the pressurized gas and the density of the pressurized gas;
And determining the intensity of the oscillating wave according to the peak pulsation flow curve, the velocity of sound of the pressurized gas and the density of the pressurized gas.
5. The method of claim 1, wherein determining whether a surge flag is present based on the oscillating wave intensity comprises:
detecting the intensity of the oscillating wave in real time under the condition that the intensity of the oscillating wave is in a preset threshold range;
and under the condition that the intensity of the oscillating wave exceeds a preset threshold value, determining that a surge zone bit exists.
6. The method of claim 1, wherein obtaining the engine gas circuit demand torque and the engine gas circuit demand torque comprises:
Judging a vehicle battery to obtain a judging result;
Acquiring the current required torque of the engine under the condition that the vehicle battery is full, or the ambient temperature of the vehicle battery is lower than the preset temperature, or the vehicle battery has a fault;
and decoupling the current required torque to obtain the required torque of the engine gas circuit and the required torque of the engine fire circuit.
7. The method of claim 1, wherein controlling the engine gas circuit and the engine fire circuit based on the engine gas circuit demand torque and the engine fire circuit demand torque, respectively, comprises:
determining a throttle closing speed according to the engine gas circuit required torque, and determining an oil injection quantity and an ignition angle according to the engine gas circuit required torque; the throttle closing speed is lower than a preset speed threshold;
And controlling the throttle valve to be closed according to the throttle valve closing speed so as to enable the air inflow to slowly decrease, controlling the fuel injector according to the fuel injection quantity so as to reduce the fuel injection quantity, and controlling the ignition advance angle to withdraw according to the ignition angle so as to enable the engine output torque to rapidly decrease.
8. An apparatus for controlling an engine, comprising:
The working condition identification module is configured to identify the working condition of the engine to obtain a working condition identification result;
The first acquisition module is configured to acquire the intensity of the oscillating wave of the engine air intake under the condition that the condition identification result is that the surge condition is identified;
a determining module configured to determine whether a surge flag bit exists according to the oscillating wave intensity;
the second acquisition module is configured to acquire the engine gas circuit required torque and the engine gas circuit required torque under the condition that the existence of the surge zone bit is determined;
And the control module is configured to control the engine gas circuit and the engine fire circuit according to the engine gas circuit required torque and the engine fire circuit required torque respectively.
9. An electronic device, comprising:
one or more processors;
Storage means for storing one or more programs that, when executed by the one or more processors, cause the electronic device to implement the method for controlling an engine of any of claims 1-7.
10. A computer-readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method for controlling an engine according to any one of claims 1 to 7.
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| CN202410107515.5A CN117967463A (en) | 2024-01-25 | 2024-01-25 | Method, apparatus, electronic device, and storage medium for controlling engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410107515.5A CN117967463A (en) | 2024-01-25 | 2024-01-25 | Method, apparatus, electronic device, and storage medium for controlling engine |
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