CN114763764B - Control method, system and equipment of electric supercharger - Google Patents
Control method, system and equipment of electric supercharger Download PDFInfo
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- CN114763764B CN114763764B CN202110051769.6A CN202110051769A CN114763764B CN 114763764 B CN114763764 B CN 114763764B CN 202110051769 A CN202110051769 A CN 202110051769A CN 114763764 B CN114763764 B CN 114763764B
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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
- F02B37/04—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
- F02B37/14—Control of the alternation between or the operation of exhaust drive and other drive of a pump, e.g. dependent on speed
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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
Abstract
The embodiment of the invention provides a control method, a control system and control equipment for an electric supercharger, which are used for acquiring an acceleration request; judging whether the acceleration request meets a request condition, and when the acceleration request meets the request condition, enabling the electric supercharger to enter an enabling state and enabling the engine to enter a turbocharger and electric supercharger composite supercharger mode; acquiring a target supercharging pressure ratio of an electric supercharger and front-rear actual pressure ratios of the current electric supercharger; acquiring the actual control pressure ratio of the electric supercharger according to the target supercharging pressure ratio of the electric supercharger and the front-rear actual pressure ratio of the current electric supercharger; acquiring the current air inlet mass flow mshfm and the temperature at an upstream inlet of the electric supercharger; and acquiring a target control rotating speed of the electric supercharger according to the current air inlet mass flow mshfm, the actual control pressure ratio of the electric supercharger and the temperature at the upstream inlet of the electric supercharger.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a control method, a control system and control equipment of an electric supercharger.
Background
The electric supercharger can realize rapid air supplementing, and reduce the inherent turbo lag phenomenon of the exhaust gas turbocharged engine, thereby improving the dynamic response of the engine and the drivability.
By adding the electric supercharging technology into the traditional turbo-supercharged engine, the torque response time of the engine can be remarkably improved, the problem of acceleration weakness caused by the exhaust turbo hysteresis phenomenon is avoided, and the drivability is improved. The hysteresis characteristics of the turbo-charging affect not only the establishment of the boost pressure but also the control of the boost pressure. Meanwhile, if the electric supercharger is improperly controlled, the problems of overshoot of the supercharging pressure (overlarge supercharging pressure), drop of the engine speed (over-fast ESC exit and abrupt change of the supercharging pressure) and the like are easily caused, and the driving experience is affected.
In the prior art, a gasoline engine compound supercharging control method is provided, wherein a motor supercharger is used for working in cooperation with a turbocharger. When the automobile starts or accelerates, the ESC directly enters the highest rotation speed and cooperates with the exhaust gas turbocharger to work at the same time, and the boost pressure can quickly reach the target value under the drive of the ESC high-speed motor. The electric supercharger will immediately exit operation after the target boost pressure is established, and the full authority of the exhaust gas turbocharger is given over the pressure control. ESC and exhaust gas turbocharger simultaneously exit operating state when accelerator pedal is released or brake is engaged
The combined double-turbo control method is simpler, and the ESC has only two working modes: the first is the highest speed operation, and the second is closing exit. Over time, the "turbo lag" phenomenon at the exhaust-gas turbocharger end gradually disappears, and the output pressure becomes higher and higher. Because the ESC is always operating at the highest rotational speed, even if the ESC is immediately withdrawn after the target boost pressure is established, the boost pressure still exceeds the target range under the inertia of blade rotation, causing overshoot.
Disclosure of Invention
In order to solve the above problems, the present invention is to provide a control method of an electric supercharger, which is used to solve the technical problem in the prior art that the electric supercharger always works at the highest rotation speed, and even if the electric supercharger exits immediately after the target supercharging pressure is established, the supercharging pressure still exceeds the target range under the inertia of blade rotation, so as to cause an overshoot phenomenon.
In order to solve the technical problems, the embodiment of the invention adopts the following technical scheme:
a control method of an electric supercharger, the control method comprising the steps of:
the energy distribution method for acquiring the battery temperature and respectively combining the battery temperature with the preheating temperature threshold value and the heating temperature comprises the following steps:
acquiring an acceleration request;
determining whether the acceleration request satisfies a request condition,
when the acceleration request meets a request condition, the electric supercharger enters an enabling state and the engine enters a turbocharger and electric supercharger compound supercharger mode;
obtaining a target boost pressure ratio PR of an electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act ；
According to the target boost pressure ratio PR of the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act Obtaining an actual control pressure ratio PR of the electric supercharger pid ；
Obtaining a current intake mass flow mshfm and a temperature T at an upstream inlet of the electric supercharger upstream ；
Actual control pressure ratio PR of electric supercharger according to current intake mass flow mshfm pid And temperature T at the upstream inlet of the electric supercharger upstream Acquiring a target electric supercharger control rotation speed N esc 。
Further, the step of obtaining the target control rotation speed of the electric supercharger according to the current air intake mass flow mshfm and the actual control pressure ratio of the electric supercharger specifically includes:
acquiring the temperature at an upstream inlet of the electric supercharger;
acquiring corrected mass flow according to the temperature at an upstream inlet of the electric supercharger and the current air inlet mass flow mshfm;
acquiring a corrected rotating speed according to the corrected mass flow and the actual control pressure ratio of the electric supercharger;
and acquiring the control rotating speed of the target electric supercharger according to the corrected rotating speed.
Further, the actual control pressure ratio PR of the electric supercharger according to the current air intake mass flow mshfm pid And temperature T at the upstream inlet of the electric supercharger upstream Acquiring a target electric supercharger control rotation speed N esc The steps of (a) further comprise:
acquiring the rotating speed of an engine;
for said engineRotational speed, current intake mass flow rate, and electric supercharger target supercharging pressure ratio PR tar Respectively making the judgment of the exit condition,
when the rotational speed of the engine, the current intake mass flow rate and the electric supercharger target supercharging pressure ratio PR tar When any one of the conditions satisfies the exit condition, the electric supercharger exits the operation and enters a turbocharger independent operation mode.
Further, the exit condition specifically includes:
target boost pressure ratio PR of electric supercharger tar Reducing the target pressure ratio to be within a first preset ratio, wherein the target pressure ratio in the continuous first preset time period is smaller than a second preset ratio;
the rotating speed of the engine exceeds a preset rotating speed;
the current intake mass flow exceeds the upper bound of the electric supercharger blockage flow.
Further, the acceleration request specifically includes:
a requested torque request, a torque request rate of change, and a current engine speed.
Further, the acceleration request satisfies a request condition specifically:
the demand torque request is greater than a first threshold;
the torque request rate of change is greater than the second threshold,
the engine speed is lower than a third threshold value;
the exit flag bit of the electric supercharger is not set;
and when all the conditions are met, the acceleration request meets the request conditions.
Further, the target supercharging PR according to the electric supercharger tar Pressure ratio and front-to-rear actual pressure ratio PR of the current electric supercharger act Obtaining an actual control pressure ratio PR of the electric supercharger pid The method comprises the following steps:
target supercharging PR of the electric supercharger tar Pressure ratio and front-to-rear actual pressure ratio PR of the current electric supercharger act Calculating by PID algorithm to obtain the actual control pressure ratio of the electric superchargerPR pid 。
Further, an air inlet path of the turbocharger and electric supercharger compound supercharger mode sequentially flows through the turbocharger, the electric supercharger, the intercooler and the throttle valve;
the independent working mode air inlet path of the turbocharger is that the turbocharger, the electric supercharger bypass valve, the intercooler and the throttle valve flow in sequence.
The embodiment of the invention also provides a control system of the electric supercharger, which comprises the following modules:
the request module is used for acquiring an acceleration request;
a judging module for judging whether the acceleration request meets the request condition,
when the acceleration request meets a request condition, the electric supercharger enters an enabling state and the engine enters a turbocharger and electric supercharger compound supercharger mode;
a first acquisition module for acquiring a target boost pressure ratio PR of the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act ；
A control pressure ratio module for controlling the target supercharging pressure ratio PR of the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act Obtaining an actual control pressure ratio PR of the electric supercharger pid ；
A second acquisition module for acquiring a current intake mass flow mshfm and a temperature T at an upstream inlet of the electric supercharger upstream ；
A rotating speed module for controlling the pressure ratio PR of the electric supercharger according to the current air intake mass flow mshfm pid And temperature T at the upstream inlet of the electric supercharger upstream Acquiring a target electric supercharger control rotation speed N esc And controlling the rotation speed N according to the target electric supercharger esc The rotational speed of the electric supercharger is controlled.
The embodiment of the invention also provides control equipment of the electric supercharger, which comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the control method of the electric supercharger according to the instructions in the program code.
Compared with the prior art, the embodiment of the invention has the beneficial effects that:
the control method of the electric supercharger provided by the embodiment of the invention obtains an acceleration request; judging whether the acceleration request meets a request condition, and when the acceleration request meets the request condition, enabling the electric supercharger to enter an enabling state and enabling the engine to enter a turbocharger and electric supercharger composite supercharger mode; acquiring a target supercharging pressure ratio of an electric supercharger and front-rear actual pressure ratios of the current electric supercharger; acquiring the actual control pressure ratio of the electric supercharger according to the target supercharging pressure ratio of the electric supercharger and the front-rear actual pressure ratio of the current electric supercharger; acquiring the current air inlet mass flow mshfm and the temperature at an upstream inlet of the electric supercharger; and acquiring a target control rotating speed of the electric supercharger according to the current air inlet mass flow mshfm, the actual control pressure ratio of the electric supercharger and the temperature at the upstream inlet of the electric supercharger.
In the control method of the electric supercharger provided by the embodiment of the invention, through judging the acceleration request, when the request condition is met, the target supercharging pressure ratio PR of the electric supercharger is obtained tar And the current electric supercharger front-to-rear actual pressure ratio PR act Calculating to obtain the actual control pressure ratio PR of the electric supercharger pid Based on the current air intake mass flow mshfm and the temperature T at the upstream inlet of the electric supercharger upstream Calculating to obtain the control rotating speed N of the target electric supercharger esc And controlling the rotation speed N according to the target electric supercharger esc Controlling the rotation speed of the electric supercharger; according to the actual control pressure ratio PR of the electric supercharger pid To actually calculate the control rotation speed N of the target electric supercharger esc After the target electric supercharger control rotation is obtained through calculationSpeed N esc To control the rotational speed of the electric supercharger;
compared with the prior art, the control method of the electric supercharger realizes the accurate control of the electric supercharger on the supercharging pressure, can quickly and accurately establish the supercharging curve of the electric supercharger, accurately manages the supercharging pressure of the engine through the rotating speed of the electric supercharger, effectively avoids the phenomenon of overshoot of the supercharging pressure, stabilizes the output torque of the engine and improves the drivability of the vehicle; the method effectively avoids the addition of the electric supercharger, leads to abrupt change of supercharging pressure, realizes smooth connection between the turbocharger and the electric supercharger, stably provides supercharging pressure for the engine, and is favorable for improving the thermal efficiency of the engine, thereby improving the fuel economy and the dynamic property of the engine.
The technical problem that in the prior art, as the electric supercharger always works at the highest rotating speed, after the target supercharging pressure is established, even if the electric supercharger is immediately withdrawn, the supercharging pressure still exceeds the target range under the inertia of rotation of the blades, and the overshoot phenomenon is caused is solved.
The invention also provides a control system of the electric supercharger, which realizes the accurate control of the electric supercharger on the supercharging pressure, can quickly and accurately establish the supercharging curve of the electric supercharger, accurately manages the supercharging pressure of the engine through the rotating speed of the electric supercharger, effectively avoids the overshoot phenomenon of the supercharging pressure, stabilizes the output torque of the engine and improves the drivability of the vehicle.
The invention also provides light mixing equipment, which realizes the accurate control of the electric supercharger on the supercharging pressure, can quickly and accurately establish the supercharging curve of the electric supercharger, accurately manages the supercharging pressure of the engine through the rotating speed of the electric supercharger, effectively avoids the overshoot phenomenon of the supercharging pressure, stabilizes the output torque of the engine and improves the drivability of the vehicle.
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 flowchart of a control method of an electric supercharger provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of an engine boosting device according to a control method of an electric supercharger according to an embodiment of the present invention;
FIG. 3 is a system block diagram of a control system for an electric supercharger provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control device for an electric supercharger 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, the present embodiment provides a control method of an electric supercharger, the control method including the steps of:
as shown in fig. 2, the engine supercharging apparatus in the present embodiment includes a controller, an electric supercharger 200, an electric supercharger bypass valve 201, a turbocharger 100, an intercooler 300, and a throttle valve 400, the turbocharger 100, the electric supercharger bypass valve 201, the intercooler 300, and the throttle valve 400 are connected in this order, and both ends of the electric supercharger 200 are connected between the turbocharger 100 and the electric supercharger 200 and between the electric supercharger bypass valve 201 and the intercooler 300, respectively;
the controller is an Electronic Control Unit (ECU);
acquiring an acceleration request;
when the driver rapidly presses the accelerator pedal, the ECU acquires an instruction of an acceleration request, and the ECU calculates a required torque request under the current opening degree of the pedal of the driver and a torque request change rate in a table-look-up mode, so that the acceleration request is obtained, namely the acceleration request comprises the required torque request, the torque request change rate and the current engine speed.
Determining whether the acceleration request satisfies a request condition,
the acceleration request satisfies request conditions specifically as follows:
the demand torque request is greater than a first threshold;
the torque request rate of change is greater than the second threshold,
the engine speed is lower than a third threshold value;
the exit flag bit of the electric supercharger is not set;
and when all the conditions are met, the acceleration request meets the request conditions.
When any request condition is not satisfied, the request condition is not satisfied.
The exit zone bit of the electric supercharger is not set, namely the electric supercharger is in a normal working state, specifically:
avoiding stall of the electric supercharger: the use of an electric supercharger should not cause the electric supercharger to stall, resulting in loss of function or damage to the electric supercharger during an acceleration event.
Prevent the electric supercharger from overheating: the use of an electric supercharger should not cause the electric supercharger to overheat, resulting in loss of function or damage to the electric supercharger during an acceleration event.
If during use of the electric supercharger any vehicle component affecting the function of the electric supercharger is found to have a fault that may lead to damage or malfunction, use of the electric supercharger should be inhibited.
The electric supercharger should be suitable for use in cold ambient conditions. In this case, the available power of the 48V battery may be zero, and thus power needs to be obtained from other sources such as BSG or DCDC converters.
When using power sources other than 48V batteries, the electric booster should reduce peak power consumption,
the method comprises the steps of,
if any one of the following devices fails, the electric booster is restrained, namely the electric booster exits the flag position;
BSG controller, 48vBMS, ESC controller, ECU affecting hybrid operation, and ECU affecting boost control
The electric supercharger will be disabled when any of the following conditions are met
The electric supercharger pressure ratio is below a first calibrated value;
the electric supercharger activation time exceeds a second calibration value;
the engine boost pressure exceeds the demand by more than a third calibrated value;
when a failure to suppress the electric supercharger is detected;
when a surge in boost pressure of the electric supercharger is detected.
The first, second, and third calibration values may be set according to the type of the electric supercharger and the performance of the electric supercharger itself.
In this embodiment, the first threshold is 100Nm, the second threshold is 1Nm/s, the third threshold is 3500r, and the first threshold, the second threshold and the third threshold may be adjusted according to actual situations.
In addition, the electric supercharger detects that the self rotating speed control has larger deviation and reports faults to stop working according to the self protection requirement of the electric supercharger hardware.
When the acceleration request meets a request condition, the electric supercharger enters an enabling state and the engine enters a turbocharger and electric supercharger compound supercharger mode;
the air inlet path of the turbocharger and electric supercharger compound supercharger mode sequentially flows through the turbocharger, the electric supercharger, the intercooler and the throttle valve; the turbocharger and the electric supercharger cooperatively control the boost pressure, at which time the electric supercharger bypass valve is closed, thereby enabling the turbocharger and the electric supercharger cooperatively to effectively control the boost pressure.
Obtaining a target boost pressure ratio PR of an electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act ；
Calculating a target boost pressure ratio PR of an electric supercharger tar ，
Calculating the front-rear actual pressure ratio PR of the current electric supercharger act ，
Wherein pvds is the target boost pressure (hpa) of the ECU, pvd is the actual boost pressure (hpa) actually measured by the sensor received by the ECU, and P upstream Is the pressure (hpa) at the inlet upstream of the electric supercharger;
according to the target boost pressure ratio PR of the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act Obtaining an actual control pressure ratio PR of the electric supercharger pid ；
The method comprises the following steps: target supercharging PR of the electric supercharger tar Pressure ratio and front-to-rear actual pressure ratio PR of the current electric supercharger act Calculating by PID algorithm to obtain actual control pressure ratio PR of the electric supercharger pid 。
The PID algorithm is a motion proportional-integral-derivative (PID) control method, and in this embodiment, the proportional-integral-derivative (PID) control method is used to adjust and calibrate the corresponding parameters of the P term or the I term to optimize the control, thereby realizing:
(1) Under the condition that the actual pressure meets 80% of the target pressure, the response time of the electric booster pressure in the blade tip is ensured to be less than 1s. The actual pressure is the actual boost pressure measured by the sensor, and the target boost pressure is the required boost pressure judged by the ECU according to the current working condition.
(2) The use of an electric supercharger does not cause the boost pressure to overshoot more than 40kPa at any time.
(3) The use of an electric supercharger does not result in a boost pressure exceeding 20kPa for a period of time exceeding 1000 msec.
Obtaining a current intake mass flow mshfm and a temperature T at an upstream inlet of the electric supercharger upstream ；
The current intake mass flow mshfm may be obtained from the ECU, T upstream The temperature (k) at the upstream inlet of the electric supercharger can be measured directly by a temperature and pressure sensor.
Actual control pressure ratio PR of electric supercharger according to current intake mass flow mshfm pid And temperature T at the upstream inlet of the electric supercharger upstream Acquiring a target electric supercharger control rotation speed N esc And controlling the rotation speed N according to the target electric supercharger esc The rotational speed of the electric supercharger is controlled.
According to the actual control pressure ratio PR of the electric supercharger pid The current air inlet mass flow mshfm can be checked into an electric supercharger characteristic map table to finally obtain the current target electric supercharger control rotating speed N esc 。
After the air intake mass flow is corrected by utilizing a temperature and pressure sensor at the upstream of the electric supercharger, the electric supercharger characteristic map is used for checking a table, and the table checking speed value is converted to obtain the actual speed.
The method comprises the following steps:
acquiring temperature T at upstream inlet of electric supercharger upstream ；
According to the temperature T at the upstream inlet of the electric supercharger upstream And the current intake mass flow mshfm, obtaining a corrected mass flow m corrected ；
Wherein T is ref And P ref The reference temperature and pressure are respectively 298K and 1000hpa, which are known fixed values;
according to the corrected mass flow m corrected And the actual control pressure ratio PR of the electric supercharger pid Obtaining a corrected rotational speed rpm corrected ；
In the map table of the electric supercharger characteristics, the corrected mass flow rate m correc t ed And a target control pressure ratio PR pid Look-up table is performed to directly obtain the corrected rotational speed rpm corrected The actual control rotation speed N can be obtained after the secondary conversion esc (rpm)；
According to the corrected rotational speed rpm corrected Acquiring a target electric supercharger control rotation speed N esc And controlling the rotation speed N according to the target electric supercharger esc Controlling the rotation speed of the electric supercharger;
controlling the rotating speed N according to the obtained target electric supercharger esc The rotating speed of the electric supercharger is controlled, so that the electric supercharger can be controlled in real time as required, a supercharging curve of the electric supercharger can be quickly and accurately established, the supercharging pressure of the engine is accurately managed through the rotating speed of the electric supercharger, the overshoot phenomenon of the supercharging pressure is effectively avoided, the output torque of the engine is stabilized, and the drivability of a vehicle is improved; the method effectively avoids the addition of the electric supercharger, leads to abrupt change of supercharging pressure, realizes smooth connection between the turbocharger and the electric supercharger, stably provides supercharging pressure for the engine, and is favorable for improving the thermal efficiency of the engine, thereby improving the fuel economy and the dynamic property of the engine.
In addition, the control of the supercharging ratio of the electric supercharger is realized by controlling the rotation speed of the electric supercharger in real time, and after the electric supercharger exits, the torque change is not more than 15Nm, the engine rotation speed change is more than 50 revolutions per minute, and the supercharging pressure change is more than 8kPa; the target boost pressure is stabilized, the vehicle drivability is improved, and the problem of boost pressure fluctuation caused by the change of the working state of the electric supercharger is solved while the quick response of the boost pressure is ensured.
And the problem that the control error is caused by the influence of calculation fluctuation and the like of an engine torque model when the working state of the electric supercharger is ambiguous is avoided.
Further, the actual control pressure ratio PR of the electric supercharger according to the current air intake mass flow mshfm pid And upstream of the electric superchargerTemperature T at inlet upstream Acquiring a target electric supercharger control rotation speed N esc And controlling the rotation speed N according to the target electric supercharger esc The step of controlling the rotational speed of the electric supercharger further includes:
acquiring the rotating speed of an engine;
the engine speed, the current intake mass flow rate, and the electric supercharger target supercharging pressure ratio PR tar Respectively making the judgment of the exit condition,
when the rotational speed of the engine, the current intake mass flow rate and the electric supercharger target supercharging pressure ratio PR tar When any one of the conditions satisfies the exit condition, the electric supercharger exits the operation and enters a turbocharger independent operation mode.
Electric superchargers are integrated with the base engine to improve performance and vehicle drivability. However, the energy efficiency of the turbocharger is significantly higher than that of the electric turbocharger, and therefore, as the turbocharger accelerates, the ECU control should phase out the work done by the electric turbocharger to maximize the overall efficiency.
When the turbocharger is capable of providing the desired boost pressure to meet the driver's demand, the electric supercharger should be deactivated; a condition for the electric supercharger to be deactivated, i.e., an exit condition for the electric supercharger;
the exit condition is specifically as follows:
target boost pressure ratio PR of electric supercharger tar Reducing the target pressure ratio to be within a first preset ratio, wherein the target pressure ratio in the continuous first preset time period is smaller than a second preset ratio; the first preset ratio is 1.1, the first preset time length is 0.2s, and the second preset ratio is 1.1; the first preset ratio, the second preset ratio and the first preset duration can be calibrated according to actual conditions.
The rotating speed of the engine exceeds a preset rotating speed; the preset rotating speed is 3500rpm, and the preset rotating speed can be set correspondingly when different acceleration requests are met.
The current intake mass flow exceeds the upper bound of the electric supercharger blockage flow.
The independent working mode air inlet path of the turbocharger is that the turbocharger, the electric supercharger bypass valve, the intercooler and the throttle valve flow in sequence. At this time, the bypass valve of the electric supercharger is instantly fully opened, the electric supercharger returns to a standby state, and the rotating speed is kept near 3000rpm, so that preparation is made for the next speed increase.
When the electric supercharger is in an active state, the electric supercharger bypass valve should be closed. The electric supercharger bypass valve is commanded to gradually close over a period of time that reaches a calibrated value for electric supercharger exit.
The electric supercharger bypass valve closing request should occur after the electric supercharger indication decides to be enabled.
When the ESC is no longer active, the ESC bypass valve should be opened. During normal operation, the ESC bypass valve should be commanded to gradually open over a period of time to change the engine intake path to reduce pumping losses.
If a severe surge condition is detected, the electric supercharger bypass valve should be commanded fully open immediately.
When the turbocharger air intake relief valve is in an active state, the electric turbocharger bypass valve should be opened quickly.
The end of the working state of the electric supercharger is defined by the target supercharging pressure ratio [ (target supercharging pressure + medium-cooling pressure loss)/inlet pressure]Judging that the rotation speed is also according to the target supercharging pressure ratio PR tar To calculate and control, thus, the target boost pressure ratio PR tar When the speed is reduced, the corresponding rotating speed is reduced, so that a deceleration transition period exists from the stable operation to the exit stage, the turbocharger is effectively cooperated, and the phenomenon of sudden drop of the boost pressure is avoided.
Wherein the target engine manifold air pressure is received from an ECU controlling base engine operation. The ECU may also measure the pressure and temperature of the intake air, the electric supercharger, the turbocharger, and the junction between the intake manifold.
In order to achieve the desired boost pressure on the engine intake manifold, the target electric supercharger pressure ratio should be determined from measurements of the turbocharger pressure ratio and the barometric pressure; the electric supercharger target pressure ratio is set to control electric supercharger power consumption to prevent overheating.
As shown in fig. 3, an embodiment of the present invention further provides a control system of an electric supercharger, the control system including the following modules:
a request module 210, where the request module 210 is configured to obtain an acceleration request;
a judging module 220, wherein the judging module 220 is used for judging whether the acceleration request meets the request condition,
when the acceleration request meets a request condition, the electric supercharger enters an enabling state and the engine enters a turbocharger and electric supercharger compound supercharger mode;
a first acquisition module 230, where the first acquisition module 230 is configured to acquire a target boost pressure ratio PR of the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act ；
A control pressure ratio module 240, the control pressure ratio module 240 being configured to control a target boost pressure ratio PR according to the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act Obtaining an actual control pressure ratio PR of the electric supercharger pid ；
A second acquisition module 250, wherein the second acquisition module 250 is configured to acquire a current intake mass flow mshfm and a temperature T at an upstream inlet of the electric supercharger upstream ；
A rotation speed module 260, wherein the rotation speed module 260 is used for controlling the pressure ratio PR of the electric supercharger according to the current air intake mass flow mshfm pid And temperature T at the upstream inlet of the electric supercharger upstream Acquiring a target electric supercharger control rotation speed N esc And controlling the rotation speed N according to the target electric supercharger esc The rotational speed of the electric supercharger is controlled.
The invention also provides a control system of the electric supercharger, which realizes the accurate control of the electric supercharger on the supercharging pressure, can quickly and accurately establish the supercharging curve of the electric supercharger, accurately manages the supercharging pressure of the engine through the rotating speed of the electric supercharger, effectively avoids the overshoot phenomenon of the supercharging pressure, stabilizes the output torque of the engine and improves the drivability of the vehicle.
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.
As shown in fig. 4, an embodiment of the present invention further provides a control apparatus of an electric supercharger, including a processor 303 and a memory 301;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the control method of the electric supercharger according to the instructions in the program code.
As shown in fig. 3, a control device of an electric supercharger, the device includes a processor 303 and a memory 301;
the memory 301 is used for storing a program code 302 and transmitting the program code 302 to the processor;
the processor 303 is configured to execute the steps of the control method of an electric supercharger according to the instructions in the program code 302.
The invention also provides control equipment of the electric supercharger, which realizes the accurate control of the electric supercharger on the supercharging pressure, can quickly and accurately establish the supercharging curve of the electric supercharger, accurately manages the supercharging pressure of the engine through the rotating speed of the electric supercharger, effectively avoids the overshoot phenomenon of the supercharging pressure, stabilizes the output torque of the engine and improves the drivability of the vehicle.
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.
Illustratively, the computer program 302 may be partitioned into one or more modules/units that are stored in the memory 301 and executed by the processor 303 to complete the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing the specified functions, which instruction segments are used for describing the execution of the computer program 302 in the terminal device 30.
The terminal device 30 may be a computing device such as a desktop computer, a notebook computer, a palm computer, and a cloud server. The terminal device may include, but is not limited to, a processor 303, a memory 301. It will be appreciated by those skilled in the art that fig. 3 is merely an example of the terminal device 30 and is not meant to be limiting as to the terminal device 30, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., the terminal device may also include input and output devices, network access devices, buses, etc.
The processor 303 may be a central processing unit (CentralProcessingUnit, CPU), other general purpose processors, digital signal processors (DigitalSignalProcessor, DSP), application specific integrated circuits (ApplicationSpecificIntegratedCircuit, ASIC), off-the-shelf programmable gate arrays (Field-ProgrammaBleGateArray, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 301 may be an internal storage unit of the terminal device 30, such as a hard disk or a memory of the terminal device 30. The memory 301 may also be an external storage device of the terminal device 30, such as a plug-in hard disk, a smart memory card (SmartMediaCard, SMC), a secure digital (SecureDigital, SD) card, a flash memory card (FlashCard), etc. provided on the terminal device 30. Further, the memory 301 may also include both an internal storage unit and an external storage device of the terminal device 30. The memory 301 is used for storing the computer program and other programs and data required by the terminal device. The memory 301 may also be used to temporarily store data that has been output or is to be output.
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.
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 usb disk, a removable hard disk, a Read-only memory (ROM), a random access memory (RAM, randomAccessMemory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
According to the embodiment of the invention, a request for acquiring the labeling task picture is sent to a labeling platform server through a client; after the labeling platform server receives the request, the distributed buffer area carries out registration service to the coordination module;
after the registration service is completed, the coordination module reads and writes the picture index information with the time stamp in the index library, and sends the picture index information to the distributed buffer area; the distributed buffer zone feeds back concurrent access quantity to the coordination module;
the coordination module adjusts and distributes the picture index information to the distributed buffer according to the concurrent access quantity; the client reads the picture index information of the distributed buffer area and downloads the labeling task picture according to the picture index information;
and the client submits the labeling information to the labeling platform server, and the labeling platform server updates the labeling state of the index information of the labeling task picture. The embodiment of the invention solves the problem of high concurrency read-write by adding the memory buffer area under the distributed storage of big data, provides a high throughput concurrency marking service method, and solves the technical problem that the high concurrency read-write of the data marking service occurs due to the fact that a strategy of a high concurrency read-write lock is not provided when the data is marked in the prior art.
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 (10)
1. A control method of an electric supercharger, characterized by comprising the steps of:
acquiring an acceleration request;
determining whether the acceleration request satisfies a request condition,
when the acceleration request meets a request condition, the electric supercharger enters an enabling state and the engine enters a turbocharger and electric supercharger compound supercharger mode;
obtaining a target boost pressure ratio PR of an electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act ；
According to the target boost pressure ratio PR of the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act Obtaining an actual control pressure ratio PR of the electric supercharger pid ；
Obtaining a current intake mass flow mshfm and a temperature T at an upstream inlet of the electric supercharger upstream ；
Actual control pressure ratio PR of electric supercharger according to current intake mass flow mshfm pid And temperature T at the upstream inlet of the electric supercharger upstream Acquiring a target electric supercharger control rotation speed N esc And controlling the rotation speed N according to the target electric supercharger esc The rotational speed of the electric supercharger is controlled.
2. The control method of an electric supercharger according to claim 1, wherein the actual control pressure ratio PR of the electric supercharger is based on the current intake mass flow rate mshfm pid And temperature T at the upstream inlet of the electric supercharger upstream Acquiring a target electric supercharger control rotation speed N esc The method comprises the following steps:
acquiring temperature T at upstream inlet of electric supercharger upstream ；
According to the temperature T at the upstream inlet of the electric supercharger upstream And the current intake mass flow mshfm, obtaining a corrected mass flow m corrected ；
According to the corrected mass flow m corrected And the actual control pressure ratio PR of the electric supercharger pid Obtaining a corrected rotational speed rpm corrected ；
According to the corrected rotational speed rpm corrected Acquiring a target electric supercharger control rotation speed N esc 。
3. The control method of an electric supercharger according to claim 1, wherein the actual control pressure ratio PR of the electric supercharger is based on the current intake mass flow rate mshfm pid And temperature T at the upstream inlet of the electric supercharger upstream Acquiring a target electric supercharger control rotation speed N esc And controlling the rotation speed N according to the target electric supercharger esc The step of controlling the rotational speed of the electric supercharger further includes:
acquiring the rotating speed of an engine;
the engine speed, the current intake mass flow rate, and the electric supercharger target supercharging pressure ratio PR tar Respectively making the judgment of the exit condition,
when the rotational speed of the engine, the current intake mass flow rate and the electric supercharger target supercharging pressure ratio PR tar When any one of the conditions satisfies the exit condition, the electric supercharger exits the operation and enters a turbocharger independent operation mode.
4. The control method of an electric supercharger according to claim 3, wherein the exit condition is specifically:
target boost pressure ratio PR of electric supercharger tar The target supercharging pressure ratio PR of the electric supercharger is reduced to be within a first preset ratio and continuously within a first preset time period tar Less than a second preset ratio;
the rotating speed of the engine exceeds a preset rotating speed;
the current intake mass flow exceeds the upper bound of the electric supercharger blockage flow.
5. The method for controlling an electric supercharger according to claim 1, wherein,
the acceleration request specifically includes:
a requested torque request, a torque request rate of change, and a current engine speed.
6. The method for controlling an electric supercharger according to claim 5 wherein,
the request conditions satisfied by the acceleration request are specifically as follows:
the demand torque request is greater than a first threshold;
the torque request rate of change is greater than the second threshold,
the engine speed is lower than a third threshold value;
the exit flag bit of the electric supercharger is not set;
and when all the conditions are met, the acceleration request meets the request conditions.
7. The control method of an electric supercharger according to claim 1, wherein the target supercharging pressure ratio PR according to the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act Obtaining an actual control pressure ratio PR of the electric supercharger pid The method comprises the following steps:
the target boost pressure ratio PR of the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act Calculating by PID algorithm to obtain actual control pressure ratio PR of the electric supercharger pid 。
8. The control method of an electric supercharger according to claim 3 wherein,
the air inlet path of the turbocharger and electric supercharger compound supercharger mode sequentially flows through the turbocharger, the electric supercharger, the intercooler and the throttle valve;
the independent working mode air inlet path of the turbocharger is that the turbocharger, the electric supercharger bypass valve, the intercooler and the throttle valve flow in sequence.
9. A control system for an electric supercharger, the control system comprising the following modules:
the request module is used for acquiring an acceleration request;
a judging module for judging whether the acceleration request meets the request condition,
when the acceleration request meets a request condition, the electric supercharger enters an enabling state and the engine enters a turbocharger and electric supercharger compound supercharger mode;
a first acquisition module for acquiring a target boost pressure ratio PR of the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act ；
A control pressure ratio module for controlling the target supercharging pressure ratio PR of the electric supercharger tar And the current electric supercharger front-to-rear actual pressure ratio PR act Obtaining an actual control pressure ratio PR of the electric supercharger pid ；
A second acquisition module for acquiring a current intake mass flow mshfm and a temperature T at an upstream inlet of the electric supercharger upstream ；
A rotating speed module for controlling the pressure ratio PR of the electric supercharger according to the current air intake mass flow mshfm pid And temperature T at the upstream inlet of the electric supercharger upstream Acquiring a target electric supercharger control rotation speed N esc 。
10. A control device of an electric supercharger, characterized by comprising a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the control method of the electric supercharger according to any one of claims 1 to 8 according to instructions in the program code.
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| JP5853403B2 (en) * | 2011-04-25 | 2016-02-09 | 日産自動車株式会社 | Control device for internal combustion engine |
| CN102230418B (en) * | 2011-06-17 | 2012-08-08 | 北京理工大学 | Electricity-auxiliary two-stage supercharging system capable of reusing exhaust gas |
| JP5719257B2 (en) * | 2011-09-02 | 2015-05-13 | ダイムラー・アクチェンゲゼルシャフトＤａｉｍｌｅｒ ＡＧ | Supercharger control device |
| JP6377340B2 (en) * | 2013-12-04 | 2018-08-22 | 三菱重工業株式会社 | Control device for supercharging system |
| JP6227086B1 (en) * | 2016-10-11 | 2017-11-08 | 三菱電機株式会社 | Control device and control method for internal combustion engine with supercharger |
| CN106368804B (en) * | 2016-11-04 | 2019-02-15 | 广州汽车集团股份有限公司 | Engine booster method and system |
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