CN111794872B - Surge identification and control method for engine supercharger - Google Patents
Surge identification and control method for engine supercharger Download PDFInfo
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- CN111794872B CN111794872B CN202010670613.1A CN202010670613A CN111794872B CN 111794872 B CN111794872 B CN 111794872B CN 202010670613 A CN202010670613 A CN 202010670613A CN 111794872 B CN111794872 B CN 111794872B
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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
- F02D41/0002—Controlling intake air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
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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
- F02D9/00—Controlling engines by throttling air or fuel-and-air induction conduits or exhaust conduits
- F02D9/08—Throttle valves specially adapted therefor; Arrangements of such valves in conduits
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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
- F02D2200/1012—Engine speed gradient
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/05—High pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust system upstream of the turbine and reintroduced into the intake system downstream of the compressor
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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
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a surge identification and control method of an engine supercharger, which comprises the following steps: 1) the ECU calculates various supercharger surge intervention conditions according to the input signals of the engine; 2) executing the step 3 when the surge intervention conditions of the supercharger are met, otherwise, executing the step 5; 3) the ECU outputs different anti-surge control signals according to different engine combustion modes to control the surge of the supercharger; 4) the ECU calculates various supercharger surge exit conditions according to the input signals of the engine; 5) if the surge exit condition of any supercharger is met, executing the step 6, otherwise, executing the step 1; 6) the ECU outputs a control signal so that the intake throttle valve, the EGR valve, and the exhaust throttle valve no longer execute the anti-surge target opening amounts. The invention can solve the problem of surge of the engine supercharger under different combustion modes without influencing the thermal management of the engine, the emission of the engine and the cost.
Description
Technical Field
The invention belongs to the field of engine control, and particularly relates to a surge identification and control method for an engine supercharger.
Background
The surge of the supercharger is the phenomenon that the blades of a diffuser and an impeller of the gas compressor have stall, and the reasons are mainly as follows: the intake air amount suddenly decreases; the rotational speed of the supercharger abnormally increases; the operation condition of the engine changes suddenly; the compressor efficiency enters the surge line, etc. The occurrence of surging can generate noise such as squeaking, the fuel economy is deteriorated, and parts of the compressor can be seriously damaged.
At present, the high-efficiency heat management technology of the engine is increasingly popularized and diversified, the heat management of the engine is improved by means of an air inlet throttle valve, an air outlet throttle valve, an Exhaust Gas Recirculation (EGR) valve and the like, and the emission of the engine is reduced to become a key choice of the current engine technical route; the traditional exhaust gas bypass type supercharger is selected to have higher surge risk under the technical route of high-efficiency heat management, and particularly for high-efficiency heat management, under the condition that an air inlet throttle valve is excessively closed, if the opening degree is insufficient, the heat management requirement cannot be met, so that the emission cannot meet the regulation requirement.
In the prior art, the judgment of the surge of the supercharger is carried out through a single condition of the pressure ratio of the supercharger, so that the risks of judgment leakage and misjudgment of the surge of the supercharger exist; the fully-opened EGR valve controls supercharger surge when the supercharger surges, the defects of low heat management and high emission exist, and the fully-opened EGR valve in a regenerative combustion mode can deteriorate the performance of an engine and the durability of the EGR valve; the surge of the supercharger is controlled by adding a pressure relief valve on the engine, so that the defects of complex structure and high cost exist; the prior art methods all suffer from certain limitations and complexities.
Disclosure of Invention
The invention aims to solve the supercharger surge risk and the problems in the prior art, and provides an engine supercharger surge identification and control method, which aims to solve the problem of the engine supercharger surge in different combustion modes without influencing the heat management of an engine, the emission of the engine and the cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a surge recognition and control method of an engine supercharger, which is characterized by being applied to an engine intake and exhaust system consisting of an engine, an electronic control unit ECU of the engine, the supercharger, an intake throttle valve, an EGR valve and an exhaust throttle valve, and comprising the following steps:
step 2, if the surge intervention conditions of the supercharger are all met, identifying that the engine is in a supercharger surge state, and executing step 3, otherwise, executing step 5;
step 3, the ECU outputs different anti-surge control signals to the air inlet throttle valve, the EGR valve and the exhaust throttle valve according to different engine combustion modes so as to control the surge of the supercharger;
Step 4, the ECU calculates various supercharger surge exit conditions according to the engine input signals;
step 5, when any supercharger surging quit condition is met, identifying that the engine is in a supercharger surging quit state, and executing step 6, otherwise, executing step 1;
and 6, outputting control signals to the air inlet throttle valve, the EGR valve and the exhaust throttle valve by the electronic control unit ECU of the engine, so that the air inlet throttle valve, the EGR valve and the exhaust throttle valve do not execute the anti-surge target opening degree in the step 3 any more.
The method for identifying and controlling the surge of the engine supercharger is also characterized in that the various supercharger surge intervening conditions in the step 1 comprise the following steps:
calculating the current torque change rate through the differential of the current torque of the engine to time, and taking the current torque change rate after filtering as a judgment condition 1 for the surge intervention of the supercharger when the current torque change rate is continuously smaller than a calibrated torque change rate intervention threshold;
calculating the current rotating speed change rate through the differential of the current rotating speed of the engine to time, and when the filtered current rotating speed change rate is continuously smaller than a calibrated rotating speed change rate threshold value, taking the filtered current rotating speed change rate as a judgment condition 2 for the surge intervention of the supercharger;
The method comprises the following steps that an ECU (electronic control unit) of the engine calibrates supercharging pressure ratio surge thresholds under different air inlet flow rates and different pre-supercharging pressures in advance, calculates the current supercharging pressure ratio according to the ratio of the real-time supercharging pressure of the engine to the pre-supercharging pressure, and takes the current supercharging pressure ratio as a judgment supercharger surge intervention condition 3 when the supercharging pressure ratio is greater than the supercharging pressure ratio surge threshold;
calculating the current pressure difference of the supercharger through the pressure after the current supercharger is supercharged and the pressure before the supercharger whirlpool, and taking the current pressure difference as a judgment condition 4 for the surging intervention of the supercharger when the current pressure difference of the supercharger is larger than the pressure difference threshold of the supercharger;
and when the current air inflow of the engine is smaller than the air inflow threshold value, the condition is used as a condition 5 for judging the surge intervention of the supercharger.
The plurality of supercharger surge exit conditions in step 4, comprising:
when any supercharger surge intervention condition is not met for more than a certain time, judging a supercharger surge exit condition 1;
calculating the current torque change rate by differentiating the current torque of the engine with respect to time, and taking the current torque change rate after filtering as a judgment condition 2 for judging the surge quitting of the supercharger when the current torque change rate is continuously greater than a calibrated torque change rate quitting threshold;
the method comprises the steps that safe threshold values of the supercharging pressure ratio under different air intake flows are preset by the ECU of the engine, the current supercharging pressure ratio is calculated according to the ratio of the pressure after the engine is supercharged in real time to the pressure before the engine is supercharged, and when the supercharging pressure ratio is smaller than the safe threshold value of the supercharging pressure ratio, the judgment of a supercharger surge exit condition 3 is carried out.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the input signal of the engine is obtained to the ECU, the ECU calculates various conditions which can cause the surge of the supercharger in real time, and the problem of misjudgment and missed judgment of the supercharger surge in the prior art is solved by comprehensively judging whether the supercharger surges or not according to all the conditions, so that the accurate recognition of the supercharger surge is realized;
2. according to the invention, the ECU outputs different control signals to the air inlet throttle valve, the EGR valve and the exhaust throttle valve according to different engine combustion modes, so that the air inlet throttle valve, the EGR valve and the exhaust throttle valve execute respective set target opening degrees, and the problems of supercharger surge prevention, engine thermal management and engine emission conflict in the prior art are solved;
3. the ECU calculates various supercharger surge exit conditions in real time, comprehensively judges whether the supercharger surge is eliminated or not by all the conditions, shortens the ECU surge control time, and optimizes the heat management and the discharge of the engine in the anti-surge process;
4. the invention does not need to add parts such as a pressure release valve and the like, and does not increase the cost.
Drawings
FIG. 1 is a flow chart of a method of identifying and controlling surge in an engine supercharger of the present invention;
FIG. 2 is a block diagram of an exemplary engine intake and exhaust system to which the present invention may be applied;
FIG. 3 is a flow chart of an intervening condition of surge in an engine supercharger of the present invention;
FIG. 4 is a flow chart of engine surge control for different combustion modes of the present invention;
FIG. 5 is a flow chart of an exit condition for surge of an engine supercharger of the present invention;
Detailed Description
In the present embodiment, a typical engine intake and exhaust system structure diagram to which the engine supercharger surge identification and control method is applied is shown in fig. 2, an engine S1 is provided with an intake throttle valve S5 on an intake pipe, an exhaust throttle valve S6 on an exhaust pipe, a supercharger S4 and an EGR valve S7 between the intake and exhaust pipes, and an electronic engine control unit ECU S3 outputs various control signals to the intake throttle valve S5, the exhaust throttle valve S6 and the EGR valve S7 by obtaining an engine input signal S2, so as to reduce engine emissions and realize normal engine operation. As shown in fig. 3, the engine input signal S2 is engine speed, pre-supercharging pressure, post-supercharging pressure, pre-whirling pressure, intake air flow rate, and engine torque obtained from engine ECU internal model values obtained from a plurality of sensors; specifically, as shown in fig. 1, the identification and control method includes:
S110, calculating various supercharger surge intervention conditions by an electronic control unit ECU (electronic control unit) according to an engine input signal;
s120, when the surge intervention conditions of the supercharger are met, identifying that the engine is in a supercharger surge state;
s130, the electronic control unit ECU of the engine outputs different anti-surge control signals to an air inlet throttle valve, an EGR valve and an exhaust throttle valve according to different combustion modes of the engine so as to control the surge of a supercharger;
s140, calculating various supercharger surge exit conditions by an electronic control unit ECU according to an engine input signal;
s150, when the surge quit condition of any supercharger is met, judging that the engine is in a supercharger surge quit state;
s160, the electronic control unit ECU of the engine outputs control signals to the air inlet throttle valve, the EGR valve and the exhaust throttle valve, so that the air inlet throttle valve, the EGR valve and the exhaust throttle valve do not execute the set target opening any more;
as shown in FIG. 3, various supercharger surge intervention conditions include:
s210, calculating the current torque change rate through the differential of the current torque of the engine to time, and taking the current torque change rate after filtering as a judgment condition 1 for the surge intervention of the supercharger when the current torque change rate is continuously smaller than a calibrated torque change rate intervention threshold;
S220, calculating the current rotating speed change rate through the differential of the current rotating speed of the engine to time, and taking the current rotating speed change rate after filtering as a judgment condition 2 for the surge intervention of the supercharger when the current rotating speed change rate is continuously smaller than a calibrated rotating speed change rate threshold value;
s230, presetting boost pressure ratio surge thresholds under different intake flows and different pre-boost pressures by an Electronic Control Unit (ECU) of the engine, calculating a current boost pressure ratio according to the ratio of the pressure after the real-time boost of the engine to the pressure before the boost, and taking the current boost pressure ratio as a judgment booster surge intervention condition 3 when the boost pressure ratio is greater than the boost pressure ratio surge threshold;
s240, calculating the current pressure difference of the supercharger according to the pressure after the current supercharger is supercharged and the pressure before the supercharger whirlpool, and when the pressure difference of the supercharger is greater than the pressure difference threshold of the supercharger, taking the pressure difference as a judgment condition 4 for the surging intervention of the supercharger;
s250, when the current air inflow of the engine is smaller than an air inflow threshold value, taking the current air inflow as a judgment condition 5 for the surge intervention of the supercharger;
specifically, the method for determining the torque change rate intervention threshold and the rotating speed change rate threshold comprises the steps of acquiring multiple groups of test data which enable the rotating speed of the supercharger to fluctuate violently and enable the supercharger to generate obvious squeaking sound by taking a plurality of external characteristic torques as initial torques through an engine test bench from an abrupt throttle to an idle speed, and finding out the maximum effective torque change rate and the rotating speed change rate when all surging occurs in the test data as the torque change rate intervention threshold and the rotating speed change rate threshold by calculating the multiple groups of torque change rates and rotating speed change rates.
The supercharging pressure ratio surge threshold value and the supercharger pressure difference threshold value are obtained by acquiring universal characteristic data of a supercharger test through an engine test bed, drawing a supercharger efficiency curve graph, calculating supercharging pressure ratio surge threshold values of different air inlet flows and different supercharging pressure pressures through interpolation of the efficiency curve graph, and calculating the supercharger pressure difference threshold value; it should be noted that surge does not occur at high flow, and the threshold value of the air intake amount is a surge line air intake amount critical value obtained in a supercharger efficiency curve chart through the external characteristics of the engine;
when the surge intervention conditions of the supercharger are all satisfied, identifying that the engine is in a supercharger surge state, namely a supercharger surge state S260 shown in FIG. 3 is 1;
as shown in fig. 4, the different engine combustion modes S300 are used for achieving the best performance and emissions of the engine, and mainly include a normal mode S310, a thermal management mode S320, and a regeneration mode S330; wherein, the normal mode S310 is the temperature when the exhaust temperature of the post-treatment reaches the high conversion efficiency of the post-treatment, and in order to improve the performance and the economy of the engine, the air inlet throttle valve is fully opened, the exhaust throttle valve is fully opened, and the EGR valve normally executes the action according to the calibrated MAP in the normal mode; the thermal management mode S320 is used for rapidly increasing the aftertreatment exhaust temperature of the engine and further reducing the emission of the engine, and at the moment, the air inlet throttle valve, the EGR valve and the exhaust throttle valve normally execute actions according to the calibrated MAP in the thermal management mode; the regeneration mode S330 is to process soot in the DPF (Diesel Particulate Filter, DPF for short), and at this time, the EGR valve is fully closed, and the intake throttle valve and the exhaust throttle valve normally perform operations according to the calibrated MAP in the regeneration mode;
When the engine is operated in different combustion modes, the intake throttle valve, the EGR valve and the exhaust throttle valve respectively perform different opening actions, and the engine may surge in different combustion modes. The invention provides that when a supercharger surge state is identified S260, an engine electronic control unit ECU outputs different anti-surge control signals to an air inlet throttle valve, an EGR valve and an exhaust throttle valve according to different engine combustion modes S300 so as to control the supercharger surge;
specifically, through engine performance and emission test verification results, opening degree set values of the air inlet throttle valve in different combustion modes are calibrated; when entering a surge state of the supercharger, the ECU outputs different calibrated opening setting values of the air inlet throttle valve to the air inlet throttle valve according to different combustion modes of the engine, so that the air inlet throttle valve executes different target opening of the air inlet throttle valve;
calibrating EGR valve opening set values under different combustion modes according to engine performance and emission test verification results; when entering a supercharger surge state, the ECU outputs different calibrated EGR valve opening degree set values to the EGR valve according to different combustion modes of the engine, so that the EGR valve executes different EGR valve target opening degrees;
Calibrating the opening set values of the exhaust throttle valve in different combustion modes according to the engine performance and emission test verification results; when entering a surge state of the supercharger, the ECU outputs different calibrated set values of the opening degree of the exhaust throttle valve to the exhaust throttle valve according to different combustion modes of the engine, so that the exhaust throttle valve executes different target opening degrees of the exhaust throttle valve;
as shown in FIG. 5, various supercharger surge exit conditions include:
s410, when any supercharger surge intervening condition is not met, namely the supercharger surge state S260 shown in FIG. 2 is 0 and exceeds a certain time, the condition is taken as a condition 1 for judging supercharger surge exit;
s420, calculating the current torque change rate through the differentiation of the current torque of the engine to time, and taking the current torque change rate after filtering as a judgment condition 2 for judging the surge quitting of the supercharger when the current torque change rate is continuously larger than a calibrated torque change rate quitting threshold value;
s430, presetting a safe supercharging pressure ratio threshold value under different air inflow rates by an electronic control unit ECU of the engine, calculating a current supercharging pressure ratio according to the ratio of the pressure after the real-time supercharging of the engine to the pressure before the supercharging, and taking the calculated value as a condition 3 for judging the surging and exiting of the supercharger when the supercharging pressure ratio is smaller than the safe supercharging pressure ratio threshold value;
Specifically, the torque change rate quitting threshold determining method comprises the steps of finding working condition points that the rotating speed of a supercharger fluctuates sharply and the squeaking of the supercharger is obvious after an accelerator is suddenly released to an idle speed through a plurality of external characteristics of an engine test bench, adding the accelerator to a set torque until the rotating speed of the supercharger is normal and the torque change rate is achieved when the squeaking of the supercharger is avoided, and finding out the minimum effective torque change rate for eliminating all surging in test data to serve as the torque change rate quitting threshold.
The supercharging pressure ratio safety threshold is obtained by acquiring all characteristic data of a supercharger test through an engine test bed, drawing a supercharger efficiency curve graph and carrying out interpolation calculation on the efficiency curve graph to obtain the supercharging pressure ratio safety threshold based on different air intake flows;
when any supercharger surge exit condition is satisfied, determining that the engine is in a supercharger surge exit state, namely a supercharger surge exit state S440 shown in FIG. 5 is 1;
when the supercharger surge quit state S440 is 1, indicating that the supercharger surge is eliminated, the engine electronic control unit ECU outputs control signals to the intake throttle valve, the EGR valve, and the exhaust throttle valve so that the intake throttle valve, the EGR valve, and the exhaust throttle valve are executed according to the target opening degrees of fig. 4.
Claims (1)
1. A surge recognition and control method for an engine supercharger is characterized by being applied to an engine intake and exhaust system consisting of an engine, an Electronic Control Unit (ECU) of the engine, the supercharger, an intake throttle valve, an EGR valve and an exhaust throttle valve, and comprising the following steps:
step 1, calculating various supercharger surge intervention conditions by an ECU (electronic control unit) of the engine according to an engine input signal; the plurality of supercharger surge intervention conditions comprising:
calculating the current torque change rate through the differential of the current torque of the engine to time, and taking the current torque change rate after filtering as a judgment condition 1 for the surge intervention of the supercharger when the current torque change rate is continuously smaller than a calibrated torque change rate intervention threshold;
calculating the current rotating speed change rate through the differential of the current rotating speed of the engine to time, and when the filtered current rotating speed change rate is continuously smaller than a calibrated rotating speed change rate threshold value, taking the filtered current rotating speed change rate as a judgment condition 2 for the surge intervention of the supercharger;
the method comprises the following steps that an ECU (electronic control unit) of the engine calibrates supercharging pressure ratio surge thresholds under different air inlet flow rates and different pre-supercharging pressures in advance, calculates the current supercharging pressure ratio according to the ratio of the real-time supercharging pressure of the engine to the pre-supercharging pressure, and takes the current supercharging pressure ratio as a judgment supercharger surge intervention condition 3 when the supercharging pressure ratio is greater than the supercharging pressure ratio surge threshold;
Calculating the current pressure difference of the supercharger through the pressure after the current supercharger is supercharged and the pressure before the supercharger whirlpool, and taking the current pressure difference as a judgment condition 4 for the surging intervention of the supercharger when the current pressure difference of the supercharger is larger than the pressure difference threshold of the supercharger;
when the current air inflow of the engine is smaller than an air inflow threshold value, judging a supercharger surge intervening condition 5;
step 2, if the surge intervention conditions of the supercharger are all met, identifying that the engine is in a supercharger surge state, and executing step 3, otherwise, executing step 5;
step 3, the ECU outputs different anti-surge control signals to the air inlet throttle valve, the EGR valve and the exhaust throttle valve according to different engine combustion modes so as to control the surge of the supercharger;
step 4, the ECU calculates various supercharger surge exit conditions according to the engine input signals; the plurality of supercharger surge exit conditions comprising:
judging a supercharger surge exit condition 1 when any supercharger surge intervention condition is not met for more than a certain time;
calculating the current torque change rate by differentiating the current torque of the engine with respect to time, and taking the current torque change rate after filtering as a judgment condition 2 for judging the surge quitting of the supercharger when the current torque change rate is continuously greater than a calibrated torque change rate quitting threshold;
The method comprises the steps that a safe supercharging pressure ratio threshold value under different air intake flows is preset by an electronic control unit ECU of the engine, the current supercharging pressure ratio is calculated according to the ratio of the pressure after the real-time supercharging of the engine to the pressure before the supercharging, and when the supercharging pressure ratio is smaller than the safe supercharging pressure ratio threshold value, a condition 3 for judging the surging and exiting of the supercharger is adopted;
step 5, when any supercharger surging quit condition is met, identifying that the engine is in a supercharger surging quit state, and executing step 6, otherwise, executing step 1;
and 6, the ECU outputs control signals to the air inlet throttle valve, the EGR valve and the exhaust throttle valve so that the air inlet throttle valve, the EGR valve and the exhaust throttle valve do not execute the step 3 any more.
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| CN114622984B (en) * | 2022-03-10 | 2023-03-21 | 潍柴动力股份有限公司 | Engine supercharger surge prediction and control method and system |
| CN115045771B (en) * | 2022-05-16 | 2023-11-17 | 潍柴动力股份有限公司 | Surge detection method and device of supercharger, storage medium and terminal |
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| CN110985200A (en) * | 2019-12-20 | 2020-04-10 | 潍柴动力股份有限公司 | Control method and device for eliminating surge |
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| CN104314668A (en) * | 2014-10-22 | 2015-01-28 | 哈尔滨工程大学 | Device and method for controlling surging prediction of sequential turbocharging system |
| WO2017154106A1 (en) * | 2016-03-08 | 2017-09-14 | 三菱重工業株式会社 | Surge avoidance control method and surge avoidance control device for exhaust turbine turbocharger |
| CN108952982A (en) * | 2018-06-06 | 2018-12-07 | 上海汽车集团股份有限公司 | Control method of the diesel engine with high pressure exhaust gas recycling booster anti-surge |
| CN110985200A (en) * | 2019-12-20 | 2020-04-10 | 潍柴动力股份有限公司 | Control method and device for eliminating surge |
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