CN116146330A - Supercharger cooling control method - Google Patents
Supercharger cooling control method Download PDFInfo
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- CN116146330A CN116146330A CN202111403685.0A CN202111403685A CN116146330A CN 116146330 A CN116146330 A CN 116146330A CN 202111403685 A CN202111403685 A CN 202111403685A CN 116146330 A CN116146330 A CN 116146330A
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- supercharger
- water 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
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
- F02B29/0493—Controlling the air charge temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/12—Arrangements for cooling other engine or machine parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump 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
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
- F02B29/04—Cooling of air intake supply
-
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Supercharger (AREA)
Abstract
The invention discloses a supercharger cooling control method, which comprises the specific steps that before a medium temperature system performs a cooling process, EMS of an engine needs to be self-inspected; if all the systems are normal, the EMS needs to judge whether the engine speed is higher than an idling threshold; if the engine speed is higher than the idling threshold, determining the electronic water pump speed required by meeting the target air inlet temperature under different working conditions of the engine and the electronic water pump speed required by the supercharger under different working conditions without overheating; the lower limit constraint is carried out on the output of the rotating speed of the electronic water pump in the last step; and if the engine speed is lower than the idling threshold, observing whether the change rate of the engine speed is lower than 0, and judging whether the supercharger needs to perform the steps of post-cooling treatment and the like. The invention does not need to increase the power electronic water pump, avoids the increase of cost, and can also avoid the boiling phenomenon in the expansion kettle after the automobile is shut down after flameout.
Description
Technical Field
The invention relates to the technical field of engine superchargers, in particular to a supercharger cooling control method.
Background
At present, a cooling system scheme used by the whole vehicle in the market is usually a mechanical water pump and a thermostat, and the regulation of two branches of the large circulation and the bypass small circulation of the radiator is realized through the thermostat. The thermostat is generally designed to gradually open a large cycle when the temperature reaches 80-90 ℃ so that the flow enters the radiator for heat dissipation. In such a cooling system, since the mechanical water pump speed is related to the engine speed, and the thermostat is physically regulated by melting paraffin alone, neither can actively control the cooling system too much.
Charge air cooling is now very common as the mainstream technology, which generally involves two sets of cooling systems, one of which is a high temperature cooling system, i.e. an engine cooling system. And secondly, a medium-temperature cooling system, namely an air inlet medium-temperature cooling system, is used for reducing the temperature of air inlet. Because the turbine of the supercharger is tolerant to the tail gas of 700-900 ℃ for a long time and the metal has the reliability problem of thermal fatigue, the supercharger is generally connected into a high-temperature cooling system of an engine according to the mainstream design and is cooled and controlled by using a common mechanical water pump and a thermostat.
In this case, the high temperature cooling water of the engine is still low compared with the exhaust gas up to 700-900 ℃ despite the 90-110 ℃, and can be cooled under the ordinary working condition. However, when the automobile is powered off, after the mechanical water pump stops working, the cooling liquid in the cooling water pipe near the turbine of the supercharger stops flowing, the cooling liquid is heated to boiling in a short time by the metal wall surface of the turbine, heat exchange cannot be effectively carried out on the metal wall surface at the moment, the turbine is invalid after long time, in addition, after the liquid is boiled, the pressure is quickly built in the expansion kettle and the air release valve is jacked up for decompression, part of water vapor overflows, the cooling liquid is reduced after long time, and the cooling effect of the engine is poor.
Disclosure of Invention
In view of the above, the invention provides a cooling control method for a supercharger, wherein the cooling of the supercharger is realized by a medium-temperature cooling system, and the supercharger is ensured to be over-cooled on the premise of ensuring that the intake air temperature meets the requirement of an engine by controlling an electronic water pump, and the cooling after flameout of an automobile can be realized, so that the turbine is prevented from being overheated, and the problem that the cooling liquid in an expansion kettle is easy to boil after flameout in the past is solved.
The invention provides a cooling control method of a supercharger, which comprises the following steps: judging whether the engine is in a normal working state or not; if the engine is in a normal working state, further determining the electronic water pump rotating speed required by meeting the target air inlet temperature of the engine under the current working condition and the electronic water pump rotating speed required by cooling the supercharger under the current working condition, and performing electronic water pump control by using the larger one of the electronic water pump rotating speed required by meeting the target air inlet temperature and the electronic water pump rotating speed required by cooling the supercharger; if the engine is in an abnormal working state, further judging whether the supercharger needs post-cooling treatment or not; if the supercharger needs after-cooling treatment, further determining the rotating speed of the electronic water pump required by the after-cooling treatment of the supercharger.
Further, determining whether the engine is in a normal operating state includes: judging whether the rotating speed of the engine is higher than an idling threshold value or not; if the engine speed is higher than the idling threshold, confirming that the engine is in a normal working state; and if the engine speed is lower than the idling threshold, confirming that the engine is in an abnormal working state.
Further, determining whether the supercharger requires post-cooling processing includes: judging whether the change rate of the engine speed is less than 0; if the change rate of the engine speed is greater than 0, judging that the supercharger does not need to be subjected to post-cooling treatment; if the change rate of the engine speed is less than 0, continuing to observe until the change rate of the engine speed is equal to 0; if the change rate of the engine speed is equal to 0, further judging whether the engine water temperature is higher than a rear running threshold at the moment; if the temperature of the water of the engine is lower than the rear operation threshold value at the moment, the electronic water pump is stopped; if the engine water temperature is higher than the post-operation threshold at the moment, determining that the supercharger needs to be subjected to post-cooling treatment.
Further, before judging whether the engine is in the normal working state, the method further comprises the following steps: the system self-checking object comprises sensors and actuators of all systems of the engine; if all the systems are normal, the cooling control of the supercharger is carried out, if the systems are abnormal, the alarm is given, and the engine is limited.
Further, determining the electronic water pump rotational speed required to meet the target intake air temperature under different engine operating conditions includes: determining the current working condition of the engine according to the current engine speed and the current engine load; obtaining a target air inlet temperature corresponding to the current working condition based on the table lookup of the current working condition, and an initial rotating speed of the electronic water pump; and performing PID closed-loop control on the rotating speed of the electronic water pump based on the temperature difference between the actual air inlet temperature and the target air inlet temperature until the actual air inlet temperature and the target air inlet temperature are matched.
Further, the calculation formula according to which PID closed-loop control is performed on the rotation speed of the electronic water pump based on the temperature difference between the actual air intake temperature and the target air intake temperature is as follows: the electronic water pump rotating speed required by meeting the target air inlet temperature in the current working condition=the electronic water pump initial rotating speed+P+I x t, wherein the P correction amount is a single correction amount, and the I correction amount is gradually accumulated along with the time t.
Further, the current working conditions comprise high, medium and low working conditions.
Further, determining the electronic water pump speed required for cooling the supercharger under the current working condition includes: obtaining the working condition of the current supercharger based on the engine speed and the engine load; and obtaining the minimum rotating speed of the electronic water pump required by cooling the supercharger under the current working condition based on the load of the supercharger and the actual inlet air temperature table, wherein the rotating speed is the rotating speed of the electronic water pump required by the non-overheating supercharger under the current working condition.
Further, when the time t1 and t2 are set and the trend of the change in the engine speed at the set time t1 and t2 is observed at a fixed frequency, the rate of change in the engine speed= (engine speed at time t 2-engine speed at time t 1)/(t 2-t 1) is monitored three times continuously.
Further, the rotation speed of the electronic water pump in the post-cooling treatment of the supercharger is determined based on a water temperature table of the current engine, and if the working time of the engine reaches a set value, the post-cooling mode is ended, and the working time of the engine is determined based on the water temperature table of the current engine.
Compared with the prior art, the invention has the following beneficial technical effects:
according to the cooling control method for the supercharger, based on the design characteristics of the engine cooling system, the supercharger cooling system is connected to the medium-temperature cooling system of the engine instead of being kept in the high-temperature cooling system, the small-power electronic water pump in the medium-temperature cooling system is used for cooling the supercharger, the new high-power electronic water pump is not needed, the increase of cost is avoided, and the boiling phenomenon in an expansion kettle can be avoided after the automobile is flameout and stopped. In addition, by the control method, when the medium-temperature cooling system executes the control of the electronic water pump, different working conditions of the supercharger are distinguished, the allowable lower limit of the electronic water pump is restrained, and the power of the electronic water pump does not need to be increased under the unnecessary condition.
Drawings
FIG. 1 is a system diagram of a method of controlling cooling of a supercharger according to the present invention;
FIG. 2 is a flow chart of a method of controlling cooling of a supercharger according to the present invention.
Detailed Description
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.
In the description of the present invention, it should be noted that the orientation or positional relationship indicated in the present description is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Referring to fig. 1, in the cooling control method for a supercharger provided by the invention, a cooling system of the supercharger is connected to a medium-temperature cooling system of an engine, a cooling liquid inlet of the supercharger is connected between an electronic water pump and an intercooler, and a cooling liquid outlet of the supercharger is connected between auxiliary expansion water tanks of the intercooler, so that the supercharger can be cooled by virtue of the electronic water pump stored in the medium-temperature cooling system. The cooling process of the whole system comprises control of the air inlet temperature during normal operation of the engine and cooling of the supercharger during normal operation of the engine, and post-cooling treatment of the supercharger after stopping. When the engine works normally, the rotating speed of the electronic water pump needs to meet the air inlet temperature control requirement and the cooling requirement of the supercharger at the same time, because when the air inlet temperature is cooled, the electronic water pump needs to consume work, such as the cooling requirement of the supercharger, the power consumption of the electronic water pump can be further improved, and finally the electronic water pump can be embodied on the increase of the oil consumption of the engine, so that the power of the electronic water pump is reduced as much as possible on the premise of meeting the air inlet temperature and the cooling requirement of the supercharger.
The main reason for controlling the intake air temperature is that the gas density is greatly changed along with the temperature, and when the temperature is high, the gas with the same volume flow rate has smaller mass, and after entering the engine, the corresponding fuel mass is difficult to match, and the influence on the performance of the engine is great. The reason for the post-cooling treatment of the supercharger after the shutdown is that the supercharger is not in a normal working state, the automobile is driven for a long time and is stopped suddenly when the temperature is high, the mechanical water pump is coupled with the rotating speed, the engine is stopped immediately, no flow exists in the system, heat of the supercharger is accumulated in a short time, and the boiling phenomenon of cooling liquid is caused, so that the supercharger is connected to a medium-temperature cooling system, and the post-cooling treatment after the engine is stopped is needed.
Referring to fig. 2, the present invention provides a cooling control method for a supercharger, which specifically includes the following steps:
s1, performing self-inspection on the system by the EMS of the engine, if all the system is normal, performing cooling control on the supercharger, and if the system is abnormal, alarming and limiting torsion of the engine.
Specifically, after the whole vehicle is electrified, the EMS of the engine needs to perform system self-checking first to judge whether the system has a fault, if the system has no fault, the cooling control process is started, if the system has a fault, the EMS reports the fault, and the engine is limited. The self-checking object comprises sensors (temperature sensors and the like) and actuators (a radiator, an electronic water pump and the like) of each system of the engine, if the individual sensors and actuators report faults in the self-checking process, the follow-up control can not be normally performed, and the engine can not enter a normal working state, so that the EMS needs to report faults under the condition, the engine is limited and twisted, and the engine is prevented from reaching higher power in an unexpected state to cause more serious mechanical damage.
S2, before the cooling control of the supercharger, the EMS judges whether the rotation speed of the engine is higher than an idle speed threshold value, and confirms whether the engine is in a normal working state according to a judging result.
Specifically, the engine speed is acquired by EMS, the idle speed threshold is a preset value obtained through a test, and the idle speed threshold can be obtained through table lookup. If the engine speed is higher than the idling threshold, the engine is in a normal working state, and the air inlet temperature needs to be controlled and the supercharger needs to be cooled; if the engine speed is lower than the idling threshold, the engine is in an abnormal working state and is started or is ready to stop, if the engine is started, additional treatment is not needed, and if the engine is ready to stop, whether the after-cooling treatment is needed or not is needed to be continuously judged.
And S3, if the engine speed is higher than the idling threshold, determining the electronic water pump speed required by meeting the target air inlet temperature and the electronic water pump speed required by meeting the cooling of the supercharger under different working conditions of the engine.
Specifically, the intake air temperature control of the engine is related to the working condition of the engine, in the invention, the working condition of the engine is divided into low, medium and high loads, the high load working condition is a working condition close to the external characteristic of the engine, the performance requirement is higher, the supercharger is generally required to work fully, the higher exhaust gas flow is required at the moment, and the higher exhaust gas temperature is the working condition with the worst temperature resistance of the supercharger due to the high heat load; and when the load is medium and low, the supercharger is not fully loaded, the tail gas is bypassed by the air release valve, the tail gas does not fully flow through the supercharger, the heat load of the engine is low, the temperature of the tail gas is low, and the temperature resistance of the supercharger is good. Therefore, the EMS needs to determine the electronic water pump speed required to meet the target intake air temperature for each operating condition based on the engine operating conditions.
Further, the EMS acquires the rotation speed and the load of the current engine, then the EMS can acquire what working condition the engine currently belongs to based on the rotation speed and the load of the engine, and then the target air inlet temperature and the initial rotation speed of the electronic water pump corresponding to the current working condition are acquired based on the table of the current working condition. However, the actual air intake temperature and the target air intake temperature generally do not coincide immediately, and a temperature difference=actual air intake temperature-target air intake temperature exists, so the EMS system needs to perform PID closed-loop control on the rotation speed of the electronic water pump based on the difference until the actual air intake temperature and the target air intake temperature coincide. After the EMS obtains a P correction amount and an I correction amount based on the temperature difference between the actual air inlet temperature and the target air inlet temperature by table lookup, the rotating speed of the electronic water pump is corrected, wherein the P correction amount is a single correction amount, and the I correction amount is gradually accumulated along with the time t, namely: electronic water pump rotation speed required for meeting target air intake temperature=electronic water pump initial rotation speed+p+i×t under current working condition.
As described above, the intake air temperature and the power consumption of the electronic water pump are both considered in actual control, and in this combination, the engine will cost the minimum power consumption cost, and the lowest intake air temperature is obtained, so as to realize the optimal fuel consumption. Therefore, the EMS can obtain the current working state of the supercharger based on the engine speed and the engine load, and in the present invention, the working state of the supercharger is divided into three states of bit=0, 1 and 2 based on the calibration test in the initial design stage, wherein 0 represents the low load of the supercharger, 1 represents the medium load, 2 represents the full load, and the essence of the three working conditions is that the cooling requirements of three levels of low, medium and high. Based on the low, medium and high three-gear loads of the supercharger, namely three states of bit=0, 1 and 2, respectively setting the lowest rotation speed of the electronic water pump matched with the low rotation speed of the electronic water pump, and obtaining the lowest rotation speed of the electronic water pump required by the cooling of the supercharger under the current working condition based on the engine load and the actual air inlet temperature table lookup (the load state of the supercharger and the air inlet temperature are test preset values), wherein the lowest rotation speed of the electronic water pump is the rotation speed of the electronic water pump required by the cooling of the supercharger.
S4, carrying out lower limit constraint on the output of the electronic water pump rotating speed required by meeting the target air inlet temperature and the electronic water pump rotating speed required by cooling the supercharger in S3.
When the electronic water pump works, before the air inlet temperature is optimized, the minimum cooling requirement of the supercharger is required to be met preferentially, so that the lower limit constraint is carried out on the electronic water pump rotating speed required by meeting the target air inlet temperature and the electronic water pump rotating speed required by cooling the supercharger in S3 and S4, and the electronic water pump rotating speed required by cooling the supercharger are required to be output, and the electronic water pump is controlled.
And S5, if the engine speed is lower than the idling threshold, observing whether the change rate of the engine speed at the set moment is smaller than 0, and judging whether the supercharger needs to be subjected to after-cooling treatment.
When the automobile is driven violently for a long time and the temperature is higher, the automobile is stopped suddenly, and the electronic water pump is coupled with the rotating speed, so that the automobile is stopped immediately, no flow exists in the system, heat of the supercharger is accumulated in a short time, and the boiling phenomenon of the cooling liquid is caused. Therefore, after the booster is connected into the medium-temperature cooling system, the hot-dip working condition is also required to be treated. If EMS judges that the engine speed is lower than the idling threshold, the engine is considered to be started at the moment, or is ready for flameout and stop, if the engine is started, no additional treatment is needed, and if the engine is ready for flameout and stop, whether post-cooling treatment is needed is judged. The judging method comprises the following steps: at this time, the EMS continuously observes the trend of the engine speed change at the set time at a fixed frequency, and if the set time t1 and t2 are set, the set change rate= (engine speed at time t 2-engine speed at time t 1)/(engine speed at time t2-t 1) is set, and continuously monitors three times.
And S6, if the change rate of the engine speed at the set moment is greater than 0, the supercharger is not required to be subjected to post-cooling treatment, and is in a normal starting state, and if the change rate of the engine speed at the set moment is less than 0, the engine is in a ready-to-stop state, and observation is required to be continued until the change rate of the engine speed at the set moment is equal to 0.
If the three monitored change rates are all smaller than 0, the engine speed is considered to continuously drop, the engine is ready to stop, at the moment, the stop state bit is set to be equal to 1, and otherwise, the stop state bit is set to be 0. In any state, when the EMS detects that the value is equal to 0, the stopping is considered to be finished, and the stopping state bit is set to be equal to 1. When the shutdown state bit is equal to 1, it is determined whether the engine is in a hot state or a cold state, i.e., whether an after-cooling process for the supercharger is necessary.
And S7, when the change rate of the engine speed at the set moment is equal to 0, judging whether the water temperature of the engine is higher than a rear operation threshold at the moment, if so, stopping the electronic water pump, and if so, carrying out post-cooling treatment on the supercharger, and determining the required electronic water pump speed of the supercharger at the moment.
Since the water temperature sensor is typically arranged only in the high-temperature cooling system, it is only possible to determine this based on the sensor in the high-temperature cooling system. Therefore, the EMS continues to determine whether the engine water temperature is higher than a post-operation threshold (the engine water temperature is acquired by the temperature sensor, and the post-operation threshold is a preset test value), if the engine water temperature is lower than the threshold, the electronic water pump is stopped, if the engine water temperature is higher than the threshold, it is determined that the supercharger needs post-cooling treatment, and the post-cooling requirement bit is equal to 1, otherwise, the post-cooling requirement bit is equal to 0.
When the supercharger carries out post-cooling treatment, the EMS maintains the electronic water pump to work regardless of other conditions, but the rotating speed of the electronic water pump is not carried out according to the working condition of the engine at the moment. The rotating speed and the working time are set based on the water temperature of the engine, and the working time is obtained through table lookup and generally does not exceed the post-operation allowable time of the EMS. And when the post-operation time length reaches a set value or no post-cooling requirement exists, the electronic water pump is stopped, and the post-cooling mode is ended.
The engine speed, the engine load, the actual air inlet temperature and the engine water temperature are all signals acquired or calculated by the EMS; the table is obtained based on a corresponding calibration experiment, and is prestored in the EMS, and the idling threshold, the initial rotating speed of the electronic water pump, the target air inlet temperature, the P correction amount, the I correction amount, the working condition of the engine, the working condition of the supercharger, the post-operation threshold, the post-operation rotating speed and the working time length can be obtained by inquiring the preset table.
In summary, according to the cooling control method for the supercharger, based on the characteristics of the design of the engine cooling system, the supercharger cooling system is connected to the medium-temperature cooling system of the engine instead of being kept in the high-temperature cooling system, the small-power electronic water pump in the medium-temperature cooling system is used for cooling the supercharger, and the new high-power electronic water pump is not required under the unnecessary condition, so that the increase of cost is avoided, and the boiling phenomenon in the expansion kettle can be avoided after the automobile is shut down. In addition, by the control method, when the medium-temperature cooling system executes the control of the electronic water pump, different working conditions of the supercharger are distinguished, the allowable lower limit of the electronic water pump is restrained, and the power of the electronic water pump does not need to be increased under the unnecessary condition.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A supercharger cooling control method, characterized by comprising: judging whether the engine is in a normal working state or not;
if the engine is in a normal working state, determining the electronic water pump rotating speed required by meeting the target air inlet temperature of the engine under the current working condition and the electronic water pump rotating speed required by cooling the supercharger under the current working condition, and controlling the electronic water pump by the larger one of the electronic water pump rotating speed required by meeting the target air inlet temperature of the engine and the electronic water pump rotating speed required by cooling the supercharger;
if the engine is in an abnormal working state, judging whether the supercharger needs post-cooling treatment or not;
if the supercharger needs after-cooling treatment, determining the rotating speed of the electronic water pump required by the after-cooling treatment of the supercharger.
2. The supercharger cooling control method of claim 1, wherein determining whether the engine is in a normal operating state comprises:
judging whether the rotating speed of the engine is higher than an idling threshold value or not;
if the engine speed is higher than the idling threshold, confirming that the engine is in a normal working state;
and if the engine speed is lower than the idling threshold, confirming that the engine is in an abnormal working state.
3. The supercharger cooling control method of claim 1, wherein determining whether the supercharger requires post-cooling processing comprises:
judging whether the change rate of the engine speed is less than 0;
if the change rate of the engine speed is greater than 0, judging that the supercharger does not need to be subjected to post-cooling treatment;
if the change rate of the engine speed is equal to 0, judging whether the water temperature of the engine is higher than a rear operation threshold value;
if the water temperature of the engine is lower than the rear operation threshold value, the electronic water pump is stopped;
if the engine water temperature is above the post-run threshold, it is determined that the supercharger needs to be post-cooled.
4. The supercharger cooling control method of claim 1, further comprising, prior to determining whether the engine is in a normal operating state:
the system self-checking object comprises sensors and actuators of all systems of the engine;
if all the systems are normal, the cooling control of the supercharger is carried out, if the systems are abnormal, the alarm is given, and the engine is limited.
5. The supercharger cooling control method of claim 1, wherein determining the electronic water pump speed required to meet the target intake air temperature for different engine operating conditions comprises:
determining the current working condition of the engine according to the current engine speed and the current engine load;
obtaining a target air inlet temperature corresponding to the current working condition based on the table lookup of the current working condition, and an initial rotating speed of the electronic water pump;
and performing PID closed-loop control on the rotating speed of the electronic water pump based on the temperature difference between the actual air inlet temperature and the target air inlet temperature until the actual air inlet temperature and the target air inlet temperature are matched.
6. The supercharger cooling control method according to claim 5, wherein the calculation formula according to which the PID closed-loop control of the rotation speed of the electronic water pump is performed based on the temperature difference between the actual intake air temperature and the target intake air temperature is:
the electronic water pump rotating speed required by meeting the target air inlet temperature in the current working condition=the electronic water pump initial rotating speed+P+I x t, wherein the P correction amount is a single correction amount, and the I correction amount is gradually accumulated along with the time t.
7. The method of claim 5, wherein the current operating conditions include a high, a medium, and a low operating condition.
8. The supercharger cooling control method of claim 1, wherein determining an electronic water pump speed required for supercharger cooling at a current operating condition comprises:
obtaining the working condition of the current supercharger based on the engine speed and the engine load;
and obtaining the minimum rotating speed of the electronic water pump required by cooling the supercharger under the current working condition based on the load of the supercharger and the actual inlet air temperature table, wherein the rotating speed is the rotating speed of the electronic water pump required by the non-overheating supercharger under the current working condition.
9. The supercharger cooling control method according to claim 3, wherein the set times t1, t2 are set, and the change trend of the engine speeds at the set times t1, t2 is observed at a fixed frequency, and the change rate of the engine speed= (engine speed at time t 2-engine speed at time t 1)/(engine speed at time t2-t 1) is monitored three times continuously.
10. The supercharger cooling control method of claim 1, wherein the electronic water pump rotational speed at which the supercharger post-cooling treatment is satisfied is determined based on a water temperature lookup table of a current engine, and if the operation period of the engine reaches a set value, the post-cooling mode is ended and the operation period of the engine is determined based on the water temperature lookup table of the current engine.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111403685.0A CN116146330A (en) | 2021-11-22 | 2021-11-22 | Supercharger cooling control method |
| PCT/CN2022/122601 WO2023087945A1 (en) | 2021-11-22 | 2022-09-29 | Cooling control method for supercharger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111403685.0A CN116146330A (en) | 2021-11-22 | 2021-11-22 | Supercharger cooling control method |
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| CN116146330A true CN116146330A (en) | 2023-05-23 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10022967B4 (en) * | 2000-05-11 | 2007-03-08 | Daimlerchrysler Ag | Liquid cooled turbocharger |
| JP6519390B2 (en) * | 2015-07-31 | 2019-05-29 | 三菱自動車工業株式会社 | Cooling controller |
| CN105673186A (en) * | 2016-01-28 | 2016-06-15 | 奇瑞汽车股份有限公司 | Cooling system of turbocharger and control method thereof |
| CN106014610B (en) * | 2016-05-14 | 2018-07-06 | 奇瑞汽车股份有限公司 | The electronic water pump control system and its control method of a kind of turbocharged engine |
| CN113027599A (en) * | 2021-03-30 | 2021-06-25 | 一汽奔腾轿车有限公司 | Cooling system of post-operation supercharger and control method thereof |
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2021
- 2021-11-22 CN CN202111403685.0A patent/CN116146330A/en active Pending
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