CN114763763B - Cooperative control method for two-stage turbocharging, engine supercharging equipment and vehicle - Google Patents
Cooperative control method for two-stage turbocharging, engine supercharging equipment and vehicle Download PDFInfo
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- CN114763763B CN114763763B CN202110039806.1A CN202110039806A CN114763763B CN 114763763 B CN114763763 B CN 114763763B CN 202110039806 A CN202110039806 A CN 202110039806A CN 114763763 B CN114763763 B CN 114763763B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/16—Control of the pumps by bypassing charging air
- F02B37/162—Control of the pumps by bypassing charging air by bypassing, e.g. partially, intake air from pump inlet to pump outlet
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B2037/122—Control of rotational speed of the pump
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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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Abstract
The embodiment of the invention provides a cooperative control method for two-stage turbocharging, engine turbocharging equipment and a vehicle, which are characterized in that a request signal and an interrupt signal of an electric supercharger are obtained, whether the request signal meets a request condition is judged, whether the interrupt signal meets the interrupt condition is judged, when the request signal meets the request condition, namely, when the engine has turbo lag phenomenon, a cooperative working mode is started, the electric supercharger and the turbocharger are used for cooperatively boosting the engine, when the interrupt signal meets the preset interrupt condition, the working mode of the turbocharger is used for adjusting a bypass valve of the electric supercharger to be in an open state, and gas flows through the turbocharger, the bypass valve of the electric supercharger and an intercooler to a throttle valve, so that the engine can be directly boosted by the turbocharger, and the problem that the turbocharging efficiency of the turbocharger is reduced due to resistance caused when the electric supercharger directly works the engine is avoided.
Description
Technical Field
The invention relates to the technical field of engine supercharging, in particular to a cooperative control method of two-stage turbocharging, engine supercharging equipment and a vehicle.
Background
Turbocharger boost is a method of using engine exhaust energy to drive a turbocharger to achieve engine boost. The high-temperature and high-speed fuel gas exhausted by the cylinder of the internal combustion engine is fed into the turbine of the turbocharger through the exhaust pipe to push the turbine to rotate, and then the turbine drives the compressor impeller coaxial with the turbine to rotate. The air compressor compresses the sucked air, and the air with increased pressure flows through the air inlet pipe of the internal combustion engine and is supplied to the air cylinder, so that the aim of supercharging is fulfilled.
Turbo lag phenomenon is caused by the hardware characteristics of the turbocharger, and obviously occurs in the middle and low-speed working condition of the engine. The generation reason is that the kinetic energy of the exhaust gas is lower at a low rotating speed, the turbine blade at the exhaust end is difficult to be pushed at a high speed instantly due to the inertia effect, the work of the compressor is insufficient, the turbine rotating speed has a slow lifting process, and the air inlet pressure cannot be effectively and rapidly increased. The turbo lag phenomenon can directly cause the vehicle to accelerate in a short time without power when the driver suddenly steps on the accelerator, and the drivability of the vehicle is seriously affected.
The prior China patent document discloses a control method of an electronic supercharger of a vehicle, and specifically discloses a method for acquiring the required torque of an engine and obtaining the required supercharging pressure of the engine according to the required torque; determining exhaust energy according to an exhaust temperature and an exhaust amount of the engine; obtaining an expected rotation speed optimal increment of the turbocharger according to the current rotation speed and the exhaust energy of the turbocharger; obtaining a final expected rotation speed optimal increment according to the rotation speed limit value and the expected rotation speed optimal increment; obtaining the boost pressure of the turbocharger according to the required air inflow and the final expected rotation speed optimal increment; the boost pressure of the electronic supercharger is determined according to the required boost pressure and the boost pressure of the turbocharger so as to control the electronic supercharger and the drawing thereof.
According to the technical scheme, the problem of turbo lag is solved by determining that the boost pressure of the electronic supercharger directly acts on the turbocharger, but the technical scheme has the technical problems that the electronic supercharger is directly connected with the turbocharger, when the turbocharger works independently, the electronic supercharger becomes the resistance of the turbocharger to the engine boost, the difference between the pressure increased by the turbocharger and the pressure actually increased by the engine is large, and the efficiency of the turbocharger to the engine boost is reduced.
Disclosure of Invention
In order to solve the above problems, the present invention is to provide a cooperative control method of two-stage turbocharging, which is used for solving the technical problem in the prior art that the electronic supercharger is directly connected with the turbocharger, and when the turbocharger works alone, the electronic supercharger becomes the resistance of the turbocharger to the engine, so that the difference between the pressure increased by the turbocharger and the pressure actually increased by the engine is larger, and the efficiency of the turbocharger to the engine is reduced.
In order to solve the technical problems, the embodiment of the invention adopts the following technical scheme:
a cooperative control method of two-stage turbocharging, the cooperative control method comprising the steps of:
acquiring a request signal of an electric supercharger and an interrupt signal of the electric supercharger;
judging whether the request signal meets a preset request condition and whether the interrupt signal meets a preset interrupt condition;
when the request signal meets a preset request condition and the interrupt signal does not meet a preset interrupt condition, starting a cooperative working mode to boost the engine;
when the interrupt signal meets a preset interrupt condition or the request signal does not meet a preset request condition, the engine is boosted through a working mode of the turbocharger;
wherein:
the working mode of the turbocharger comprises the step that the bypass valve of the electric turbocharger is in an open state, and gas flows through the turbocharger, the bypass valve of the electric turbocharger and the intercooler to the throttle valve;
the cooperative working mode comprises that the bypass valve of the electric supercharger is in a closed state, the rotating speed of the electric supercharger is increased to a target rotating speed, and gas flows through the turbocharger, the electric supercharger and the intercooler to the throttle valve.
Further, the request signal of the electric supercharger includes: the gas circuit torque request, the gas circuit torque request change rate and the supercharging error value of the engine;
the preset request conditions comprise whether the gas circuit torque request, the gas circuit torque request change rate and the supercharging error value of the engine exceed corresponding preset thresholds or not.
Further, the electric supercharger request signal further comprises a gas circuit torque request, a gas circuit torque request change rate, a supercharging error value of the engine and last finishing time of the cooperative working mode;
the preset request conditions comprise the gas circuit torque request, the gas circuit torque request change rate, the supercharging error value of the engine and the difference between the last ending time and the current time of the cooperative working mode, and whether the difference exceeds a corresponding preset threshold value or not.
Further, the target rotation speed is:
acquiring a target supercharging pressure ratio of the electric supercharger, an upper end inlet temperature of the electric supercharger, a mass flow change of the upper end of the electric supercharger and a rotation speed limit value of the electric supercharger;
and obtaining a target rotating speed according to the target supercharging pressure ratio of the electric supercharger, the inlet temperature of the electric supercharger, the flow variation of the electric supercharger and the rotating speed limit value of the electric supercharger.
Further, the interrupt signal of the electric supercharger comprises a basic target supercharging pressure ratio of the electric supercharger;
the preset interrupt condition includes whether a base target boost pressure ratio of the electric supercharger is less than a target boost pressure ratio threshold of the electric supercharger for more than a preset first duration.
Further, the interrupt signal of the electric supercharger comprises a cooperative working mode duration;
the preset interrupt condition includes whether the cooperative working mode duration exceeds a preset second duration.
Further, the interrupt signal of the electric supercharger comprises a supercharging pressure overshoot of the engine;
the preset interrupt condition includes that the boost pressure of the engine exceeds a preset overshoot threshold.
Further, the interrupt signal of the electric supercharger comprises an electric supercharger fault flag bit and an electric supercharger surge flag bit;
the preset interrupt condition includes that the electric supercharger is positioned at the fault flag position of the electric supercharger or the surge flag position of the electric supercharger.
Further, the interrupt signal of the electric supercharger includes a rotational speed of the engine;
the preset interrupt condition includes that the rotational speed of the engine is less than a preset rotational speed.
Further, when the request signal of the electric supercharger meets a preset request condition and the interrupt signal of the electric supercharger does not meet a preset interrupt condition, starting the cooperative working mode to boost the engine further comprises:
acquiring target boost pressure of an engine and boost output pressure of a turbocharger;
judging whether the boost output pressure of the turbocharger is greater than or equal to the target boost pressure of the engine;
and when the output pressure of the turbocharger is larger than or equal to the target boost pressure of the engine, switching the cooperative working mode into the working mode of the turbocharger.
Further, when the boost output pressure of the turbocharger is equal to or greater than the target boost pressure of the engine, the switching the cooperative working mode to the turbocharger working mode further includes:
acquiring a supercharging error value of a current engine;
judging whether the current supercharging error value of the engine exceeds a preset limit supercharging error value or not;
and when the current supercharging error value of the engine exceeds a preset limit supercharging error value, starting a bypass valve of the turbocharger.
Further, before the step of obtaining the request signal of the electric supercharger and the interrupt signal of the electric supercharger, the method further comprises the following steps:
acquiring an idle speed request;
and adjusting the rotating speed of the electric supercharger to a preparation rotating speed according to the idle speed request.
Further, the method further comprises the step of before the idle speed request is acquired;
acquiring a self-checking signal;
and adjusting the rotating speed of the electric supercharger to the self-checking rotating speed according to the self-checking signal.
Further, in the turbocharger operation mode, the rotation speed of the electric supercharger is a preliminary rotation speed.
The embodiment of the invention also provides engine supercharging equipment, which comprises a controller, an electric supercharger bypass valve, a turbocharger, an intercooler and a throttle valve, wherein the turbocharger, the electric supercharger bypass valve, the intercooler and the throttle valve are sequentially connected, and two ends of the electric supercharger are respectively connected between the turbocharger and the electric supercharger and between the electric supercharger bypass valve and the intercooler;
the controller is used for controlling the electric supercharger, the electric supercharger bypass valve, the turbocharger, the intercooler and the throttle valve according to the cooperative control method of the two-stage turbocharging.
Embodiments of the present invention also provide a vehicle including an engine boosting apparatus as described above.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the embodiment of the invention provides a cooperative control method for two-stage turbocharging, engine charging equipment and a vehicle, which are characterized in that a request signal and an interrupt signal of an electric supercharger are obtained, whether the request signal meets a request condition is judged, whether the interrupt signal meets the interrupt condition is judged, when the request signal meets the request condition, namely, the engine has turbo lag phenomenon, a cooperative working mode is started, the rotating speed of the electric supercharger is increased to a target rotating speed by adjusting a bypass valve of the electric supercharger to be in a closed state, gas flows through the turbocharger, the electric supercharger and an intercooler to a throttle valve, the engine is boosted by the cooperation of the electric supercharger and the turbocharger, when the interrupt signal meets the preset interrupt condition, the working mode of the turbocharger is in an open state by adjusting the bypass valve of the electric supercharger, and the gas flows through the bypass valve of the electric supercharger and the intercooler to the throttle valve, so that the engine can be directly boosted by the turbocharger.
According to the embodiment of the invention, according to the working modes of the electric supercharger, which are actually different in request signal and interrupt signal, the turbocharger directly boosts the engine through the electric supercharger bypass valve in the opening state, so that the technical problem that in the prior art, the electronic supercharger is directly connected with the turbocharger, when the turbocharger works independently, the electronic supercharger becomes the resistance of the turbocharger to the engine boosting, the difference between the pressure of the turbocharger increased in working and the pressure of the engine increased in actual is larger, and the efficiency of the turbocharger to the engine boosting is reduced is solved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.
FIG. 1 is a flow chart of a two-stage turbocharged coordinated control method provided by an embodiment of the present invention;
FIG. 2 is a logic diagram of a two-stage turbocharger cooperative control method according to an embodiment of the present invention;
fig. 3 is a schematic structural view of an engine supercharging device according to an embodiment of the present invention.
Wherein:
100. a turbocharger; 101. a turbocharger bypass valve; 200. an electric supercharger; 201. an electric supercharger bypass valve; 300. an intercooler; 400. and a throttle valve.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the embodiments of the present application, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, interchangeably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediary, or in communication between two elements. The specific meaning of the terms in the embodiments of the present application will be understood by those of ordinary skill in the art in a specific context.
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
As shown in fig. 1 and 2, the present embodiment provides a cooperative control method of two-stage turbocharging, which includes the steps of:
acquiring a request signal of the electric supercharger 200 and an interrupt signal of the electric supercharger 200;
wherein, the request signal of the electric supercharger 200 may include a gas circuit torque request, a gas circuit torque request change rate and a supercharging error value of an engine; the gas circuit torque request can be directly measured according to a sensor, the gas circuit torque request change rate can be calculated according to the measured gas circuit torque request, and the engine supercharging error value can be obtained according to the difference between the target supercharging value of the engine and the current supercharging value of the engine.
The request signal of the electric supercharger 200 may further include a gas circuit torque request, a gas circuit torque request change rate, a supercharging error value of the engine, and a last end time of the cooperative working mode, where the gas circuit torque request, the gas circuit torque request change rate, and the supercharging error value of the engine may be obtained according to the above manner, and the last end time of the cooperative working mode may be directly read through a usage record of the electric supercharger 200.
The interrupt signal includes a base target boost pressure ratio of the electric supercharger 200, a cooperative working mode duration, an overshoot in boost pressure of the engine, a fault flag bit signal of the electric supercharger 200, a surge flag bit signal of the electric supercharger 200, or a rotational speed of the engine.
Judging whether the request signal meets a preset request condition and whether the interrupt signal meets a preset interrupt condition;
the preset request conditions comprise whether the gas circuit torque request, the gas circuit torque request change rate and the supercharging error value of the engine all exceed corresponding preset thresholds or not, or whether the preset request conditions comprise the gas circuit torque request, the gas circuit torque request change rate, the supercharging error value of the engine and the difference between the last ending time of the cooperative working mode and the current time exceed corresponding preset thresholds or not.
Wherein, the preset threshold value corresponding to the gas circuit torque request is 80Nm;
the preset threshold corresponding to the gas circuit torque request change rate is 1Nm/s;
the preset threshold corresponding to the supercharging error value of the engine is 0.1bar;
the supercharging error value of the engine and the preset threshold value corresponding to the difference between the last ending time of the cooperative working mode and the current time are 1s;
the preset interrupt conditions of the electric supercharger 200 include:
(1) Whether the basic target boost pressure ratio of the electric supercharger 200 is smaller than the target boost pressure ratio threshold of the electric supercharger 200 for more than a preset first period of time; the target boost pressure ratio threshold of the electric supercharger 200 is 1.1, and the preset first duration is 0.4s;
when the basic target boost pressure ratio of the electric supercharger 200 is less than the target boost pressure ratio threshold of the electric supercharger 200 for more than 0.4s, then there is no need to boost the rotation of the electric supercharger 200 to achieve the cooperative supercharging of the engine by the electric supercharger 200 and the turbocharger 100.
(2) Whether the cooperative working mode duration exceeds a preset second duration. The preset second time length is 10s; when the cooperative mode duration exceeds 10s, it can be basically judged that the turbo lag time has elapsed, and therefore, it is unnecessary to start the cooperative mode again.
(3) The boost pressure of the engine overshoots beyond a preset overshoot threshold. The preset overshoot threshold is 0.2bar; when the boost pressure of the engine exceeds 0.2bar, the engine needs to be protected, so that the engine does not need to be boosted in a cooperative working mode.
(4) And judging whether the electric supercharger 200 is in the electric supercharger 200 fault flag position or the electric supercharger 200 surge flag position according to the electric supercharger 200 fault flag position signal and the electric supercharger 200 surge flag position signal. When the electric supercharger 200 is in the fault flag position or the surge flag position, the electric supercharger 200 has a fault problem that the electric supercharger 200 cannot be accelerated.
The electric supercharger 200 failure flag position signal is generated by setting a boundary according to the characteristics of the electric supercharger 200, and the electric supercharger 200 surge flag position signal is generated by determining the front-rear pressure ratio and the intake air flow rate of the electric supercharger 200.
(5) The rotating speed of the engine is less than the preset rotating speed;
the preset rotating speed is 3500rpm; when the rotational speed of the engine is less than 3500rpm, the engine is not in an emergency acceleration state, i.e., there is no turbo lag phenomenon.
When the request signal meets all preset request conditions and the interrupt signal does not meet any preset interrupt condition, starting a cooperative working mode to boost the engine;
the cooperative operation mode includes the electric supercharger bypass valve 201 being in a closed state, raising the rotational speed of the electric supercharger 200 to a target rotational speed, and the gas flowing through the turbocharger 100, the electric supercharger 200, the intercooler 300 to the throttle valve 400.
The target rotational speed is:
acquiring a target boost pressure ratio of the electric supercharger 200, an upper end inlet temperature of the electric supercharger 200, a mass flow change of the upper end of the electric supercharger 200 and a rotation speed limit value of the electric supercharger 200;
a target rotation speed is obtained from a target supercharging pressure ratio of the electric supercharger 200, an inlet temperature of the electric supercharger 200, a flow rate variation amount of the electric supercharger 200, and a rotation speed limit value of the electric supercharger 200.
The rotational speed limit of the electric supercharger 200 is limited by the maximum power of the electric supercharger 200 itself, the PCB board temperature, the inlet temperature, and the maximum rotational speed.
Simultaneously, when the gas circuit torque request is more than 80Nm, the gas circuit torque request change rate is more than 1Nm/s and the supercharging error value of the engine is more than 0.1bar, the request signal is satisfied with the preset request condition;
or alternatively, the process may be performed,
meanwhile, when the gas circuit torque request is more than 80Nm, the gas circuit torque request change rate is more than 1Nm/s, the supercharging error value of the engine is more than 0.1bar, and the difference between the last end time of the cooperative working mode and the current time is more than 1s, the preset request condition is met for the request signal;
the difference between the last ending time and the current time of the cooperative working mode is greater than 1s, so as to prevent erroneous judgment from repeatedly switching to the cooperative working mode.
Meanwhile, when the basic target boost pressure ratio of the electric supercharger 200 is not smaller than the target boost pressure ratio threshold of the electric supercharger 200 and exceeds 0.4s, the duration of the cooperative working mode is not longer than 10s, the boost pressure overshoot of the engine is not longer than 0.2bar, the electric supercharger 200 is not positioned at the fault flag position of the electric supercharger 200, the electric supercharger 200 is not positioned at the surge flag position of the electric supercharger 200, and the rotating speed of the engine is not smaller than 3500rpm, the interrupt signal does not meet the preset interrupt condition.
By eliminating situations that may cause an interruption of the electric supercharger 200 and situations that satisfy the request of the electric supercharger 200, it is ensured that the electric supercharger 200 is able to accurately form a cooperative operating mode with the turbocharger 100 at turbo lag.
In the cooperative mode, the electric supercharger bypass valve 201 is closed and all of the gas flows through the turbocharger 100, the electric supercharger bypass valve 201, the intercooler 300 to the throttle 400 and finally to the engine.
In the cooperative operation mode, the electric supercharger 200 of the subsequent stage is controlled to operate in cooperation with the turbocharger 100 of the previous stage. In the case where the engine is stepped (suddenly accelerated) from a medium speed or a low speed load, turbo lag phenomenon may cause the boost pressure of the engine not to reach the target pressure value immediately. The turbo lag phenomenon can be judged through the supercharging error, the electric supercharger bypass valve 201 is controlled to be closed, the electric supercharger 200 can adjust the rotating speed of the blades according to the target supercharging pressure ratio, the flow variable quantity and the like, the blades rapidly respond to reach the target rotating speed under the driving of the motor of the electric supercharger 200, and the supercharging pressure rapidly reaches the target value required by the torque. The pressure output by the exhaust gas turbocharger 100 is gradually increased due to the gradual disappearance of the turbo lag phenomenon, and is slowly close to the target boost pressure of the engine, and the method provided by the embodiment can greatly shorten the turbo lag time of the turbocharger 100, and effectively improve the acceleration effect of the vehicle when the engine is at the medium or low rotation speed.
The dynamic air supplement of the electric supercharger 200 in the cooperative working mode enables the engine to reach the external characteristic area quickly, and the oxygen enrichment in the engine power under the dynamic working condition can be replaced, so that the oil consumption and the pollutant emission are reduced. In the cooperative working mode, the electric supercharger 200 and the turbocharger 100 can quickly provide supercharging pressure for the engine, so that the working environment capable of improving the thermal efficiency of the engine is quickly established, and the fuel economy and the power performance of the engine are improved.
When the interrupt signal meets a preset interrupt condition or the request signal does not meet a preset request condition, the engine is boosted through the working mode of the turbocharger 100;
the turbocharger 100 working mode includes that the electric turbocharger bypass valve 201 is in an open state, and gas flows through the turbocharger 100, the electric turbocharger bypass valve 201, the intercooler 300 and the throttle valve 400;
the basic target boost pressure ratio of the electric supercharger 200 is smaller than the target boost pressure ratio threshold of the electric supercharger 200 and exceeds a preset first duration, the cooperative working mode duration exceeds 10s, the boost pressure of the engine is over-regulated by more than 0.2bar, the electric supercharger 200 is positioned at the fault flag position of the electric supercharger 200, the electric supercharger 200 is positioned at the surge flag position of the electric supercharger 200, and the rotating speed of the engine is smaller than 3500rpm, and any one condition is established, and a preset interrupt condition is met for the interrupt signal.
If any one of the conditions that the gas path torque request is not more than 80Nm, the gas path torque request change rate is not more than 1Nm/s and the supercharging error value of the engine is not more than 0.1bar is met, the request signal does not meet the preset request condition;
or alternatively, the process may be performed,
if any one of the conditions that the gas circuit torque request is not more than 80Nm, the gas circuit torque request change rate is not more than 1Nm/s, the supercharging error value of the engine is not more than 0.1bar, the supercharging error value of the engine and the difference between the last end time and the current time of the cooperative working mode is not more than 1s is met, the request signal does not meet the preset request condition;
the working mode of the turbocharger 100 is that the electric turbocharger bypass valve 201 is opened, so that gas can flow through the turbocharger 100, the electric turbocharger bypass valve 201 and the intercooler 300 to the throttle 400 and finally flow into the engine, and the pressure output by the turbocharger 100 can directly act on the engine through the electric bypass valve, so that the technical problem that the efficiency of the turbocharger 100 for boosting the engine is reduced due to the fact that the electronic turbocharger is directly connected with the turbocharger 100 in the prior art is solved, when the turbocharger 100 works independently, the electronic turbocharger becomes the resistance of the turbocharger 100 for boosting the engine, the difference between the pressure increased by the turbocharger 100 and the pressure actually increased by the engine is large, and the efficiency of the turbocharger 100 for boosting the engine is reduced.
In this embodiment, by determining whether the request signal meets a preset request condition and whether the interrupt signal meets a preset interrupt condition, it can accurately determine whether the turbo lag occurs, whether the electric supercharger 200 needs to be started to superimpose the turbo supercharger 100 is determined by whether the request signal meets the preset request condition, and if not, the turbo lag may be determined to directly raise the rotation speed of the electric supercharger 200 to boost the power, but the turbo lag may be determined by a plurality of dimensions of the engine and time of sequentially working in a cooperative working mode, so as to avoid misjudgment of the turbo lag or repeated raising of the electric supercharger 200 to accelerate, resulting in excessive boost and excessive engine overshoot.
Whether the interrupt signal satisfies a preset interrupt condition is determined to determine whether the electric supercharger 200 is in a state in which it is possible to accelerate and operate in conjunction with the turbocharger 100, and also determine the condition of the engine, and determine whether it is necessary to operate in conjunction with the electric supercharger 200 and the turbocharger 100. When the interrupt signal satisfies any one of the preset interrupt conditions, the electric supercharger 200 does not accelerate, and the electric supercharger 200 and the turbocharger 100 are interrupted to enter a cooperative operation mode to protect the electric supercharger 200 and the engine.
The engine is supercharged by two operation mode adjustments of the cooperative operation mode and the operation mode of the turbocharger 100, in which the two operation modes are adjusted by switching the state of opening or closing the electric supercharger bypass valve 201 and the rotation speed increase of the electric supercharger 200 in accordance with the condition satisfied. The problem of turbo lag can be effectively solved by adjusting to the cooperative working mode.
The adjustment to the working mode of the turbocharger 100 can stop or reduce the use of the electric supercharger 200, save energy and reduce the loss of the electric supercharger 200, and meanwhile, when the situation that the turbocharger 100 is accelerated in the process of not generating turbo lag, for example, in the process of high-speed running is dealt with, the turbocharger 100 can be singly operated to complete the supercharging of the engine only by exhausting enough waste gas, and the increased pressure of the turbocharger 100 can be directly acted on the engine by opening the electric supercharger bypass valve 201, namely, the pressure output by the turbocharger 100 can directly meet the target supercharging value of the engine, so that the turbocharger 100 and the electric supercharger 200 are prevented from being directly connected in series, and the turbocharger 100 needs to consume a certain output pressure on the electric supercharger 200 to reach the target supercharging value of the engine. Even when the electric supercharger 200 rotates at a certain rotation speed, the electric supercharger 200 consumes energy, and the cooperative operation mode in the embodiment is completely equal to the operation mode which needs to be used at any time, and even when turbo lag does not occur, the engine cannot be supercharged in other ways, which is not beneficial to energy saving and reduces the working efficiency of the turbocharger 100.
When the request signal of the electric supercharger 200 meets the preset request condition and the interrupt signal of the electric supercharger 200 does not meet the preset interrupt condition, the starting the cooperative working mode to boost the engine further includes:
acquiring a target boost pressure of the engine and an boost output pressure of the turbocharger 100;
the target supercharging pressure of the engine is the pressure which needs to be increased by the engine to increase the target rotating speed of the engine;
the turbocharger 100 increases the output pressure, which is the value of the output pressure increased by the turbocharger 100.
Judging whether the boost output pressure of the turbocharger 100 is equal to or higher than the target boost pressure of the engine;
when the boost output pressure of the turbocharger 100 is equal to or higher than the target boost pressure of the engine, the cooperative operation mode is switched to the turbocharger 100 operation mode.
By determining whether the boost output pressure of the turbocharger 100 is equal to or greater than the target boost pressure of the engine, it is possible to know whether the current boost output pressure of the turbocharger 100 has already met the target boost pressure of the engine, and when the boost output pressure of the turbocharger 100 is equal to or greater than the target boost pressure of the engine, it is indicated that the engine is being boosted by the turbocharger 100 alone to meet the requirements of the engine, that is, the turbo lag time has elapsed. Therefore, the cooperative operation mode is switched to the turbocharger 100 operation mode, and the turbocharger 100 operation mode is directly used, so that the energy consumption of using the electric supercharger 200 is saved and the wear of the electric supercharger 200 is reduced.
Acquiring a supercharging error value of a current engine;
judging whether the current supercharging error value of the engine exceeds a preset limit supercharging error value or not;
when the current engine boost error value exceeds a preset limit boost error value, the turbocharger bypass valve 101 is actuated.
The step of acquiring the request signal of the electric supercharger 200 and the interrupt signal of the electric supercharger 200 further comprises:
acquiring a self-checking signal;
according to the self-checking signal, the rotation speed of the electric supercharger 200 is adjusted to the self-checking rotation speed.
The self-checking rotation speed of the electric supercharger 200 is set to be less than 2000rpm, the self-checking of the electric supercharger 200 does not have faults, the control signal is normal, and the electric supercharger 200 can work normally, and the self-checking of the electric supercharger 200 is performed in order to avoid problems occurring before the electric supercharger 200 works or works, so that the cooperative working mode cannot be implemented.
Acquiring an idle speed request;
according to the idle speed request, the rotation speed of the electric supercharger 200 is adjusted to the preliminary rotation speed.
The preliminary rotation speed is 2k-5k, the state that the electric supercharger 200 is in the preliminary rotation speed is to give the blade rotation inertia of the electric supercharger 200, and the preparation for accelerating the start of the cooperative working mode is made, so that the electric supercharger 200 can quickly reach the target rotation speed in the cooperative working mode, thereby achieving the purpose of quickly overcoming the turbo lag, and the energy consumption of the state that the electric supercharger 200 is in the preliminary rotation speed is lower.
In the operation mode of the turbocharger 100, the rotational speed of the electric supercharger 200 is a preliminary rotational speed. In the cooperative operation mode, when the electric supercharger 200 reaches the target rotation speed and the cooperative operation mode is switched to the turbo-charging operation mode, the target rotation speed of the electric supercharger 200 is gradually reduced to the preparation rotation speed, so that the electric supercharger 200 can be operated under the condition of stable low energy consumption, and the target rotation speed can be quickly reached when the cooperative operation mode is started next time.
There is further provided in this embodiment an engine supercharging apparatus, which includes a controller, an electric supercharger 200, an electric supercharger bypass valve 201, a turbocharger 100, an intercooler 300, and a throttle 400, the turbocharger 100, the electric supercharger bypass valve, the intercooler 300, and the throttle 400 being sequentially connected, two ends of the electric supercharger 200 being respectively connected between the turbocharger 100 and the electric supercharger 200 and between the electric supercharger bypass valve and the intercooler 300;
the controller is configured to control the electric supercharger 200, the electric supercharger bypass valve 201, the turbocharger 100, the intercooler 300 and the throttle valve 400 according to the cooperative control method of the two-stage turbocharging described above.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, which are not repeated herein.
There is also provided in this embodiment a vehicle characterized in that the vehicle includes an engine supercharging apparatus as described above.
In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (14)
1. A cooperative control method of two-stage turbocharging, characterized by comprising the steps of:
acquiring a request signal of an electric supercharger and an interrupt signal of the electric supercharger;
judging whether the request signal meets a preset request condition and whether the interrupt signal meets a preset interrupt condition;
when the request signal meets a preset request condition and the interrupt signal does not meet a preset interrupt condition, starting a cooperative working mode to boost the engine;
when the interrupt signal meets a preset interrupt condition or the request signal does not meet a preset request condition, the engine is boosted through a working mode of the turbocharger;
wherein:
the working mode of the turbocharger comprises the step that the bypass valve of the electric turbocharger is in an open state, and gas flows through the turbocharger, the bypass valve of the electric turbocharger and the intercooler to the throttle valve;
the cooperative working mode comprises the steps that the bypass valve of the electric supercharger is in a closed state, the rotating speed of the electric supercharger is increased to a target rotating speed, and gas flows through the turbocharger, the electric supercharger and the intercooler to the throttle valve;
the request signal of the electric supercharger comprises a gas circuit torque request, a gas circuit torque request change rate and a supercharging error value of an engine, and the preset request condition comprises whether the gas circuit torque request, the gas circuit torque request change rate and the supercharging error value of the engine exceed corresponding preset thresholds or not; or the request signal of the electric supercharger comprises a gas circuit torque request, a gas circuit torque request change rate, a supercharging error value of an engine and last time of a cooperative working mode, and the preset request condition comprises whether the difference between the gas circuit torque request, the gas circuit torque request change rate, the supercharging error value of the engine and last time of the cooperative working mode and the current time exceeds a corresponding preset threshold value.
2. The cooperative control method of two-stage turbocharging according to claim 1, characterized in that the target rotation speed is:
acquiring a target supercharging pressure ratio of the electric supercharger, an upper end inlet temperature of the electric supercharger, a mass flow change of the upper end of the electric supercharger and a rotation speed limit value of the electric supercharger;
and obtaining a target rotating speed according to the target supercharging pressure ratio of the electric supercharger, the inlet temperature of the electric supercharger, the flow variation of the electric supercharger and the rotating speed limit value of the electric supercharger.
3. The cooperative control method of two-stage turbocharging according to claim 1, wherein the interrupt signal of the electric supercharger includes a basic target supercharging pressure ratio of the electric supercharger;
the preset interrupt condition includes whether a base target boost pressure ratio of the electric supercharger is less than a target boost pressure ratio threshold of the electric supercharger and remains above a preset first duration.
4. The cooperative control method of two-stage turbocharging according to claim 1, wherein the interrupt signal of the electric supercharger includes a cooperative operation mode duration;
the preset interrupt condition includes whether the cooperative working mode duration exceeds a preset second duration.
5. The cooperative control method of two-stage turbocharging according to claim 1, wherein the interrupt signal of the electric supercharger includes a supercharging pressure overshoot of an engine;
the preset interrupt condition includes that the supercharging pressure overshoot of the engine exceeds a preset overshoot threshold.
6. The cooperative control method of two-stage turbocharging according to claim 1, wherein the interrupt signal of the electric supercharger includes an electric supercharger fault flag position signal and an electric supercharger surge flag position signal;
the preset interrupt condition comprises the step of judging whether the electric supercharger is positioned at the fault flag position of the electric supercharger or the surge flag position of the electric supercharger according to the fault flag position signal of the electric supercharger and the surge flag position signal of the electric supercharger.
7. The cooperative control method of two-stage turbocharging according to claim 1, characterized in that the interrupt signal of the electric supercharger includes a rotational speed of an engine;
the preset interrupt condition includes that the rotational speed of the engine is less than a preset rotational speed.
8. The cooperative control method of two-stage turbocharging according to any one of claims 1 to 7, wherein when the request signal of the electric supercharger satisfies a preset request condition and the interrupt signal of the electric supercharger does not satisfy a preset interrupt condition, the method further comprises the steps of, after starting the cooperative operation mode to boost the engine:
acquiring target boost pressure of an engine and boost output pressure of a turbocharger, wherein the boost output pressure of the turbocharger is an increased output pressure value of the turbocharger;
judging whether the boost output pressure of the turbocharger is greater than or equal to the target boost pressure of the engine;
and when the output pressure of the turbocharger is larger than or equal to the target supercharging pressure of the engine, switching the cooperative working mode into the working mode of the turbocharger.
9. The cooperative control method of two-stage turbocharging according to claim 8, wherein when the turbocharger boost output pressure is equal to or higher than a target turbocharging pressure of the engine, switching the cooperative operation mode to the turbocharger operation mode further includes:
acquiring a supercharging error value of a current engine;
judging whether the current supercharging error value of the engine exceeds a preset limit supercharging error value or not;
and when the current supercharging error value of the engine exceeds a preset limit supercharging error value, starting a bypass valve of the turbocharger.
10. The cooperative control method of two-stage turbocharging according to claim 1, wherein the acquiring the request signal of the electric supercharger and the interrupt signal of the electric supercharger is preceded by:
acquiring an idle speed request;
and adjusting the rotating speed of the electric supercharger to a preparation rotating speed according to the idle speed request.
11. The cooperative control method of two-stage turbocharging according to claim 10, further comprising the steps of, before the acquisition of the idle request;
acquiring a self-checking signal;
and adjusting the rotating speed of the electric supercharger to the self-checking rotating speed according to the self-checking signal.
12. The cooperative control method of two-stage turbocharging according to claim 10, wherein in the turbocharger operation mode, the rotation speed of the electric supercharger is a preliminary rotation speed.
13. The engine supercharging equipment is characterized by comprising a controller, an electric supercharger bypass valve, a turbocharger, an intercooler and a throttle valve, wherein the turbocharger, the electric supercharger bypass valve, the intercooler and the throttle valve are sequentially connected, and two ends of the electric supercharger are respectively connected between the turbocharger and the electric supercharger and between the electric supercharger bypass valve and the intercooler;
the controller is configured to control the electric supercharger, the electric supercharger bypass valve, the turbocharger, the intercooler and the throttle valve according to the cooperative control method of two-stage turbocharging of any one of claims 1 to 12.
14. A vehicle, characterized in that the vehicle comprises an engine supercharging device as claimed in claim 13.
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