CN111734520B - Piston cooling nozzle control method and system after engine shutdown and vehicle - Google Patents
Piston cooling nozzle control method and system after engine shutdown and vehicle Download PDFInfo
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- CN111734520B CN111734520B CN202010591437.2A CN202010591437A CN111734520B CN 111734520 B CN111734520 B CN 111734520B CN 202010591437 A CN202010591437 A CN 202010591437A CN 111734520 B CN111734520 B CN 111734520B
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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
- F01P3/06—Arrangements for cooling pistons
- F01P3/08—Cooling of piston exterior only, e.g. by jets
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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
- F01P2050/00—Applications
- F01P2050/22—Motor-cars
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The invention discloses a method and a system for controlling a piston cooling nozzle after an engine is stopped and a vehicle, belonging to the technical field of automobiles, wherein the method for controlling the piston cooling nozzle after the engine is stopped comprises the following steps: s1, judging that the engine is in a stop state; s2, judging whether the piston cooling nozzle is opened or not, if so, executing S3; if not, go to S4; s3, acquiring reference delay time, and closing the piston cooling nozzle after the piston cooling nozzle is opened for the reference delay time; s4, obtaining the current water temperature of the engine, judging whether the water temperature of the engine is smaller than the preset water temperature, and if so, keeping the piston cooling nozzle in a closed state; if not, the piston cooling nozzle is opened and S3 is executed. After the engine is stopped, lubricating oil can be continuously sprayed to the piston through the piston cooling nozzle, so that the cooling speed of the piston and the engine is accelerated, the piston and the engine are prevented from being damaged, and the service lives of the piston and the engine are prolonged.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a piston cooling nozzle control method and system after an engine is stopped and a vehicle.
Background
With the development of the automobile industry, in order to reduce the weight of the whole automobile, the weight and the size of an engine are smaller and smaller, which requires that the power per liter of the engine is increased continuously (the power per liter represents the work capacity per unit working volume, the power per unit working volume is larger if the power per liter is larger), the power per liter of the engine directly affects the heat load of the engine, the increase of the power per liter also means the increase of the heat load of the engine, so that the temperature of a combustion chamber and a piston of the engine is increased, and the temperature of the piston is too high, which may cause the engine to knock.
In order to reduce the temperature of the piston, most engines currently have piston cooling nozzles in the vicinity of the piston, which are in communication with the lubricating oil gallery. During the running of the automobile, lubricating oil is sprayed onto the piston through the piston cooling nozzle, and the lubricating oil has a temperature lower than that of the piston, so that the effect of cooling the piston can be achieved. The existing piston cooling nozzle stops injecting lubricating oil when an automobile engine stops, but the temperature of the piston is still relatively high, the natural cooling speed of the piston is slow, and the piston and the engine can still be damaged.
Disclosure of Invention
The invention aims to provide a piston cooling nozzle control method and a control system after an engine is stopped and a vehicle, and aims to solve the problems that in the prior art, a piston cooling nozzle stops injecting lubricating oil when an automobile engine is stopped, but the temperature of a piston is still relatively high, the natural cooling speed of the piston is slow, and the piston and the engine are possibly damaged.
As the conception, the technical scheme adopted by the invention is as follows:
a piston cooling nozzle control method after engine shutdown, comprising:
s1, judging that the engine is in a stop state;
s2, judging whether the piston cooling nozzle is opened or not, if so, executing S3; if not, go to S4;
s3, acquiring reference delay time, and closing the piston cooling nozzle after the piston cooling nozzle is opened for the reference delay time;
s4, obtaining the current water temperature of the engine, judging whether the water temperature of the engine is smaller than the preset water temperature, and if so, keeping the piston cooling nozzle in a closed state; if not, the piston cooling nozzle is opened and S3 is executed.
Further, the process of obtaining the reference delay time includes:
acquiring the current water temperature of an engine and the average power of the engine in a set time before the engine is stopped;
a map1 of the relation between the current water temperature and the average power and the basic delay time is prestored in the controller, and the controller inquires the basic delay time corresponding to the current water temperature and the average power according to the map 1;
acquiring an ambient temperature;
a relation map2 of the environmental temperature and the environmental factor correction factor is prestored in the controller, and the controller inquires the basic delay time corresponding to the environmental temperature according to the map 2;
and determining the reference delay time according to the environmental factor correction factor and the basic delay time.
Further, the determining the reference delay time according to the modified delay time includes:
multiplying the environmental factor correction factor by the basic delay time to obtain a corrected delay time;
acquiring a voltage signal of a vehicle storage battery;
a relation map3 of the voltage signal and the maximum opening time of the battery allowing the piston cooling nozzle to be continuously opened is prestored in the controller, and the controller inquires the maximum opening time corresponding to the voltage signal according to map 3;
and comparing the maximum opening time with the correction delay time, wherein the smaller value is the reference delay time.
Further, in S4, if the engine water temperature is greater than or equal to the preset water temperature, determining whether the piston cooling nozzle is in a closed state under a protection mechanism, if so, keeping the piston cooling nozzle continuously closed until a preset protection duration is reached, then opening the piston cooling nozzle, and executing S3; if not, the piston cooling nozzle is opened and S3 is executed.
Further, in S2, if the piston cooling nozzle is not opened, it is determined whether the piston cooling nozzle is in a closed state under a protection mechanism, if so, the piston cooling nozzle is kept continuously closed until a preset protection duration is reached, and then S4 is executed; if not, S4 is executed.
Further, the judging whether the piston cooling nozzle is in a closed state under a protection mechanism comprises the following steps:
acquiring the actual opening time before the piston cooling nozzle is closed, judging whether the actual opening time is greater than or equal to the preset opening time, and if so, keeping the piston cooling nozzle in a closed state under a protection mechanism; if not, the piston cooling nozzle is not in a closed state under a protection mechanism.
Further, the judging whether the piston cooling nozzle is opened includes:
judging whether an electromagnetic valve in the lubricating oil channel is opened or not, and if so, opening the piston cooling nozzle; if not, the piston cooling nozzle is closed.
To achieve the above object, the present invention further provides a piston cooling nozzle control system, comprising:
the information acquisition module is used for acquiring the current water temperature of the engine;
the judging module is used for judging whether the engine is in a stop state, whether a piston cooling nozzle is opened or not and whether the current water temperature of the engine is smaller than the preset water temperature or not;
and the reference delay time determining module is used for determining the reference delay time.
And the output execution module is used for outputting execution control signals to realize the piston cooling nozzle control method in any scheme.
In order to achieve the above object, the present invention further provides a vehicle, wherein the piston cooling nozzle is controlled by using the piston cooling nozzle control method according to any one of the above aspects.
The invention has the beneficial effects that:
the invention provides a method and a system for controlling a piston cooling nozzle after an engine is stopped and a vehicle, wherein the method for controlling the piston cooling nozzle after the engine is stopped comprises the following steps: s1, judging that the engine is in a stop state; s2, judging whether the piston cooling nozzle is opened or not, if so, executing S3; if not, go to S4; s3, acquiring reference delay time, and closing the piston cooling nozzle after the piston cooling nozzle is opened for the reference delay time; s4, obtaining the current water temperature of the engine, judging whether the water temperature of the engine is smaller than the preset water temperature, and if so, keeping the piston cooling nozzle in a closed state; if not, the piston cooling nozzle is opened and S3 is executed. According to the piston cooling nozzle control method, after the engine is stopped, lubricating oil can be continuously sprayed to the piston through the piston cooling nozzle, so that the cooling speed of the piston and the engine is accelerated, the piston and the engine are prevented from being damaged, and the service lives of the piston and the engine are prolonged.
Drawings
FIG. 1 is a flow chart of a method for controlling a piston cooling nozzle after an engine shutdown according to an embodiment of the invention;
FIG. 2 is a flowchart of a calculation process of a reference delay time after an engine shutdown according to an embodiment of the present invention;
FIG. 3 is a flow chart of a piston cooling nozzle control method after engine shutdown according to a second embodiment of the present invention;
fig. 4 is a schematic diagram of a piston cooling nozzle control system after an engine is shut down according to a third embodiment of the invention.
In the figure:
10. an information acquisition module; 20. the device comprises a judging module, a judging module 30 and a reference delay time determining module; 40. and outputting the execution module.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
Example one
Fig. 1 is a flowchart of a piston cooling nozzle control method after an engine is stopped according to the present embodiment. As shown in fig. 1, the present embodiment provides a method for controlling a piston cooling nozzle after an engine is stopped, and the method for controlling a piston cooling nozzle after an engine is stopped specifically includes the following steps:
and S1, judging that the engine is in a stop state.
Specifically, it can be understood that the temperature of the piston is high during the working process of the engine, and the piston cooling nozzle continuously or discontinuously injects lubricating oil to the piston so as to cool the piston. After the engine is stopped, the piston cooling nozzle is closed, but the temperature of the piston is still relatively high, and the natural cooling speed of the piston is slow, so that the lubricating oil needs to be continuously sprayed to the piston through the piston cooling nozzle.
Whether the engine is in the stop state can be judged through detection of the crankshaft position sensor, and whether the engine is in the stop state is judged through the crankshaft position sensor, which is mature in the prior art and is not repeated herein.
S2, judging whether the piston cooling nozzle is opened or not, if so, executing S3; if not, S4 is executed.
In this embodiment, the piston cooling nozzle is communicated with the lubricating oil passage, and an electromagnetic valve is arranged in the lubricating oil passage. Whether the piston cooling nozzle is in an open state or a closed state is judged by the electromagnetic valve. If the electromagnetic valve is in an open state, the piston cooling nozzle is in an open state, and if the electromagnetic valve is in a closed state, the piston cooling nozzle is in a closed state. Specifically, for a normally closed solenoid valve that is open when energized and closed when de-energized, the piston cooling nozzle is in an open state when the solenoid valve is energized and in a closed state when the solenoid valve is de-energized. For a normally open type electromagnetic valve which is closed when power is supplied and opened when power is off, the cooling nozzle is in a closed state when the electromagnetic valve is supplied with power, and the cooling nozzle is in an open state when the electromagnetic valve is off. The present embodiment will be described by taking a normally open type solenoid valve as an example.
And S3, acquiring the reference delay time, and closing the piston cooling nozzle after the piston cooling nozzle is opened for the reference delay time.
And when the engine is in a stop state and the piston cooling nozzle is in an open state, enabling the piston cooling nozzle to continuously spray lubricating oil to the piston, and closing the piston cooling nozzle after the reference delay time. It can be understood that after the piston cooling nozzle continues to inject the reference delay time to the piston, the temperature of the piston is already reduced to a relatively low temperature, thereby protecting the piston and the engine.
S4, obtaining the current water temperature of the engine, judging whether the water temperature of the engine is smaller than the preset water temperature, and if so, keeping the piston cooling nozzle in a closed state; if not, the piston cooling nozzle is opened and S3 is executed.
In S2, if it is determined that the piston cooling nozzle is in the closed state, there may be two cases, one being that the piston temperature is relatively low and the piston cooling nozzle is in the closed state; the other is when the piston temperature is relatively high, but the piston cooling nozzle is in a closed state. Therefore, it is necessary to determine whether or not it is necessary to continue to open the piston cooling nozzle to inject the lubricating oil. Specifically, the current water temperature of the engine is obtained, whether the water temperature of the engine is smaller than a preset water temperature or not is judged, if the water temperature of the engine is smaller than or equal to the preset water temperature, the temperature of the piston is relatively low at the moment, lubricating oil does not need to be sprayed through the piston cooling nozzle any more, and the piston cooling nozzle does not need to be opened any more at the moment. If the water temperature of the engine is larger than the preset water temperature, the temperature of the piston is still relatively high at the moment, lubricating oil needs to be sprayed through the piston cooling nozzle, at the moment, the piston cooling nozzle is opened, and the piston cooling nozzle is closed after the reference delay time, so that the piston is cooled.
In summary, according to the piston cooling nozzle control method, after the engine is stopped, the lubricating oil can be continuously sprayed to the piston through the piston cooling nozzle to accelerate the cooling speed of the piston and the engine, so that the piston and the engine are prevented from being damaged, and the service lives of the piston and the engine are prolonged.
Fig. 2 is a flowchart of a calculation process of the reference delay time according to the embodiment. Referring to fig. 2, the process of acquiring the reference delay time includes the following steps:
acquiring the current water temperature of an engine and the average power of the engine in a set time before the engine is stopped;
a relation map1 of the current water temperature and the average power and the corresponding basic delay time is prestored in the controller, and the controller inquires the basic delay time corresponding to the current water temperature and the average power according to the map 1;
acquiring an ambient temperature;
a relation map2 of the environmental temperature and the environmental factor correction factor is prestored in the controller, and the controller inquires the environmental factor correction factor corresponding to the environmental temperature according to the map 2;
and determining the reference delay time according to the environmental factor correction factor and the basic delay time.
Specifically, the current water temperature of the engine and the average power of the engine within the set time before the engine is stopped are obtained, and the purpose is to consider that the water temperature tends to be stable after the engine is warmed up and does not fluctuate too much, so the average power is introduced to reflect the heat load of the engine before the engine is stopped, the larger the average power is, the longer the basic delay time is, and when the water temperature does not reach the stable value after the engine is warmed up, the water temperature can directly reflect the cooling condition of the piston, and a basis is provided for the basic delay time.
It can be understood that if the current water temperature after the engine is stopped is higher and the average power is higher, the time for the piston cooling nozzle to continue injecting the lubricating oil is longer, so that the cooling temperature of the piston and the engine is reduced. If the current water temperature after the engine is stopped is lower and the average power is smaller, the time for the piston cooling nozzle to continuously spray lubricating oil is shorter, and the working time of the piston nozzle is shortened while the piston and the engine are cooled. The map1 can be obtained by a large number of experiments in the early period.
In addition, it can be understood that the natural cooling speed of the piston is relatively slow when the ambient temperature is high, and is relatively fast when the ambient temperature is low, so that the ambient temperature and the correction factor of the environmental factor are in a positive correlation, and if the ambient temperature is relatively high, the correction factor of the environmental factor is relatively large, and if the ambient temperature is relatively low, the correction factor of the environmental factor is relatively small. The map2 can be obtained by a large number of experiments in the early period.
The correction delay time is obtained through the basic delay time and the environmental factor correction factor, so that the piston and the engine can be fully cooled, and meanwhile, the opening time of a piston cooling nozzle can be shortened, the circulation frequency of lubricating oil is reduced, and the service life of the lubricating oil is prolonged. In this embodiment, the setting time is 60s, but in other embodiments, the specific value of the setting time may be set according to actual needs.
Further, in this embodiment, the determining the reference delay time according to the environmental factor correction factor and the basic delay time includes:
multiplying the environmental factor correction factor by the basic delay time to obtain a corrected delay time;
acquiring a voltage signal of a vehicle storage battery;
a relation map3 of the voltage signal and the maximum opening time of the piston cooling nozzle allowed to be continuously opened by the storage battery is prestored in the controller, and the controller inquires the maximum opening time corresponding to the voltage signal according to map 3;
and comparing the maximum opening time with the correction delay time, wherein the smaller value is the reference delay time.
It should be noted that the solenoid valve referred to herein is a normally closed solenoid valve, and the opening or closing of the piston cooling nozzle is realized by opening or closing the solenoid valve. Under normal conditions, the storage battery can meet the requirement that the electromagnetic valve continues to be opened after the engine stops, but if the electric quantity of the storage battery of the vehicle is low at the moment, the electromagnetic valve cannot continue to be opened and corrected delay time, so that the corrected delay time needs to be compared with the maximum opening time, and the minimum value of the corrected delay time and the maximum opening time is the reference delay time so as to protect the storage battery and avoid the power shortage of the storage battery. Among them, the map3 can be obtained by a large number of experiments in the early stage. It can be understood that, for a normally open type solenoid valve, the query of obtaining a voltage signal and the maximum opening time of a vehicle storage battery can be omitted, and the corrected delay time at this time is the reference delay time.
In summary, the method for controlling the piston cooling nozzle after the engine is stopped according to the present embodiment includes step S1, determining whether the engine is in a stopped state, if yes, executing step S2; s2, judging whether the piston cooling nozzle is opened or not, if so, executing S3; if not, go to S4; s3, acquiring reference delay time, and closing the piston cooling nozzle after the piston cooling nozzle is opened for the reference delay time; s4, obtaining the current water temperature of the engine, judging whether the water temperature of the engine is smaller than the preset water temperature, and if so, keeping the piston cooling nozzle in a closed state; if not, the piston cooling nozzle is opened and S3 is executed. After the engine is stopped, lubricating oil can be continuously sprayed to the piston through the piston cooling nozzle so as to accelerate the cooling speed of the piston and the engine, thereby avoiding the damage of the piston and the engine and prolonging the service life of the piston and the engine.
Example two
Fig. 3 is a flowchart of a piston cooling nozzle control method provided in this example. Referring to fig. 3, the piston cooling nozzle control method provided in this embodiment is substantially the same as the piston cooling nozzle control method in the first embodiment, except that: in this embodiment, in S4, if the engine water temperature is greater than or equal to the preset water temperature, it is determined whether the piston cooling nozzle is in a closed state under the protection mechanism, if so, the piston cooling nozzle is kept closed continuously until a preset protection duration is reached, then the piston cooling nozzle is opened, and S3 is executed; if not, the piston cooling nozzle is opened and S3 is executed.
Further, determining whether the piston cooling nozzle is in a closed state under a protection mechanism includes:
acquiring the actual opening time before the piston cooling nozzle is closed, judging whether the actual opening time is greater than or equal to the preset opening time, if so, enabling the piston cooling nozzle to be in a closed state under a protection mechanism, and if not, enabling the piston cooling nozzle not to be in a closed state under the protection mechanism.
It should be noted that, in this embodiment, in order to avoid the electromagnetic valve in the lubricating oil passage from generating excessive heat when working for a long time, the piston cooling nozzle needs to be forcibly closed after the preset opening duration of the work, that is, after the preset opening duration of the electromagnetic valve is opened, so that the electromagnetic valve is cooled, and the service life of the electromagnetic valve is prolonged. Therefore, whether the piston cooling nozzle is in the closed state under the protection mechanism can be judged by comparing the actual opening time length of the piston cooling nozzle, namely the electromagnetic valve before being closed with the preset opening time length. Therefore, when the piston cooling nozzle is in a closed state under a protection mechanism, the piston cooling nozzle is continuously closed until a preset protection duration is reached so that the temperature of the electromagnetic valve is not too high, and then the electromagnetic valve is opened to open the piston cooling nozzle so as to spray lubricating oil to the piston. The preset protection time length and the preset opening time length can be set according to actual needs.
Of course, in other embodiments, it may also be determined whether the piston cooling nozzle is in the closed state under the protection mechanism in S2. Specifically, in S2, if the piston cooling nozzle is not opened, it is determined whether the piston cooling nozzle is in a closed state under a protection mechanism, if so, the piston cooling nozzle is kept continuously closed until a preset protection duration is reached, and then S4 is executed; if not, S4 is executed.
EXAMPLE III
Fig. 4 is a structural diagram of a piston cooling nozzle control system after an engine is stopped according to the present embodiment, where the piston cooling nozzle control system may execute a piston cooling nozzle control method, specifically, the piston cooling nozzle control system includes:
the information acquisition module 10 is used for acquiring the current water temperature of the engine, acquiring the rotating speed of the engine, acquiring opening or closing signals of a piston cooling nozzle, acquiring average power in a set time before the engine stops and acquiring ambient temperature;
the judging module 20 is used for judging whether the engine is in a shutdown state, whether a piston cooling nozzle is opened or not and whether the current water temperature of the engine is smaller than a preset water temperature or not;
a reference delay time determination module 30, configured to determine a reference delay time;
and the output execution module 40 is used for outputting an execution signal so as to realize the piston cooling nozzle control method.
The control system for the piston cooling nozzle after the engine is stopped provided by the embodiment can be used for executing the control method for the piston cooling nozzle after the engine is stopped provided by the embodiment, and has corresponding functions and beneficial effects.
Example four
The present embodiment provides a vehicle that controls a piston cooling nozzle using the piston cooling nozzle control method after engine stop provided in the above embodiment. Specifically, the vehicle includes a controller, an engine speed detection mechanism, a temperature detection mechanism, a solenoid valve, and a piston cooling nozzle, all connected to the controller 410. In the present embodiment, the engine speed detection structure is preferably a crank position sensor for detecting whether the engine is in a stopped state. The temperature detection means is preferably a temperature sensor for detecting the current water temperature of the engine. The solenoid valve is used to open or close the piston cooling nozzle. The controller comprises the information acquisition module 10, the judgment module 20, the reference delay time determination module 30 and the output execution module 40 in the third embodiment, namely, the controller can control and execute the piston cooling nozzle control method after the engine is stopped provided by the embodiment.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A method of controlling a piston cooling nozzle after engine shutdown, comprising:
s1, judging that the engine is in a stop state;
s2, judging whether the piston cooling nozzle is opened or not, if so, executing S3; if not, go to S4;
s3, acquiring reference delay time, and closing the piston cooling nozzle after the piston cooling nozzle is opened for the reference delay time;
the process of obtaining the reference delay time comprises the following steps:
acquiring the current water temperature of an engine and the average power of the engine in a set time before the engine is stopped;
a map1 of the relation between the current water temperature and the average power and the basic delay time is prestored in the controller, and the controller inquires the basic delay time corresponding to the current water temperature and the average power according to the map 1;
acquiring an ambient temperature;
a relation map2 of the environmental temperature and the environmental factor correction factor is prestored in the controller, and the controller inquires the environmental factor correction factor corresponding to the environmental temperature according to the map 2;
determining the reference delay time according to the environmental factor correction factor and the basic delay time;
s4, obtaining the current water temperature of the engine, judging whether the water temperature of the engine is smaller than the preset water temperature, and if so, keeping the piston cooling nozzle in a closed state; if not, the piston cooling nozzle is opened and S3 is executed.
2. The piston-cooled nozzle control method after engine shutdown as recited in claim 1, wherein the determining the reference delay time by the environmental factor correction factor and a base delay time comprises:
multiplying the environmental factor correction factor by the basic delay time to obtain a corrected delay time;
acquiring a voltage signal of a vehicle storage battery;
a relation map3 of the voltage signal and the maximum opening time of the piston cooling nozzle allowed to be continuously opened by the storage battery is prestored in the controller, and the controller inquires the maximum opening time corresponding to the voltage signal according to map 3;
and comparing the maximum opening time with the correction delay time, wherein the smaller value is the reference delay time.
3. The piston cooling nozzle control method in accordance with claim 1, wherein said set time is 60 s.
4. The method of controlling a piston cooling nozzle after an engine stop according to claim 1, wherein in S4, if the current water temperature of the engine is equal to or higher than a preset water temperature, it is determined whether the piston cooling nozzle is in a closed state under a protection mechanism, if so, the piston cooling nozzle is opened after the piston cooling nozzle is kept closed continuously until a preset protection duration is reached, and S3 is executed; if not, the piston cooling nozzle is opened and S3 is executed.
5. The method for controlling the piston cooling nozzle after the engine stop according to claim 1, wherein in S2, if the piston cooling nozzle is not opened, it is determined whether the piston cooling nozzle is in a closed state under a protection mechanism, if so, the piston cooling nozzle is kept closed continuously until a preset protection duration is reached, and then S4 is executed; if not, S4 is executed.
6. The piston cooling nozzle control method after engine stop according to claim 4 or 5, wherein said judging whether or not the piston cooling nozzle is in the closed state under the protection mechanism includes:
acquiring the actual opening time before the piston cooling nozzle is closed, judging whether the actual opening time is greater than or equal to the preset opening time, and if so, keeping the piston cooling nozzle in a closed state under a protection mechanism; if not, the piston cooling nozzle is not in a closed state under a protection mechanism.
7. The piston cooling nozzle control method after engine stop according to claim 1, wherein said judging whether or not the piston cooling nozzle is open includes:
judging whether an electromagnetic valve in the lubricating oil channel is opened or not, and if so, opening the piston cooling nozzle; if not, the piston cooling nozzle is closed.
8. A piston cooling nozzle control system after engine shutdown, comprising:
the information acquisition module (10) is used for acquiring the current water temperature of the engine;
the judging module (20) is used for judging whether the engine is in a stop state, whether the piston cooling nozzle is opened or not and whether the current water temperature of the engine is smaller than the preset water temperature or not;
a reference delay time determination module (30) for determining a reference delay time;
an output execution module (40) for outputting an execution control signal to implement the piston cooling nozzle control method after engine shutdown as claimed in any one of claims 1-7.
9. A vehicle characterized in that a piston cooling nozzle is controlled by the piston cooling nozzle control method after engine stop according to any one of claims 1 to 7.
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| CN202010591437.2A CN111734520B (en) | 2020-06-24 | 2020-06-24 | Piston cooling nozzle control method and system after engine shutdown and vehicle |
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| CN202010591437.2A CN111734520B (en) | 2020-06-24 | 2020-06-24 | Piston cooling nozzle control method and system after engine shutdown and vehicle |
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