CN110454252B - Variable displacement oil pump control method - Google Patents

Variable displacement oil pump control method Download PDF

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CN110454252B
CN110454252B CN201910676142.2A CN201910676142A CN110454252B CN 110454252 B CN110454252 B CN 110454252B CN 201910676142 A CN201910676142 A CN 201910676142A CN 110454252 B CN110454252 B CN 110454252B
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engine
working condition
temperature
ecu
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CN110454252A (en
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张蒙
刘正勇
张国宇
李安
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FAW Group Corp
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FAW Group Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/18—Indicating or safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/18—Indicating or safety devices
    • F01M1/20—Indicating or safety devices concerning lubricant pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0246—Adjustable pumps

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

The invention relates to the technical field of automobiles, in particular to a variable displacement oil pump control method which comprises the steps that after an engine is started, if the actual temperature value of cooling liquid is smaller than the preset cooling liquid temperature value and the actual temperature value of engine oil is between the first preset engine oil temperature value and the second preset engine oil temperature value, an ECU (electronic control Unit) obtains the normal-temperature working condition corresponding to the percentage a1 of the current load of the engine and the maximum design load of the engine and the current rotating speed n1 of the engine, adjusts the pump oil pressure of the variable displacement oil pump according to the normal-temperature working condition, and can enable the pump oil pressure of the variable displacement oil pump to adapt to different normal-temperature working conditions, so that the economy of fuel oil is realized, after the time T, the ECU obtains the actual engine oil pressure P of a main oil duct and compares the actual engine oil pressure P with the preset normal
Figure DDA0002143343930000011
The method is repeated, and the normal temperature working condition is the corresponding relation between different a1 and different n1 and different P10.

Description

Variable displacement oil pump control method
Technical Field
The invention relates to the technical field of automobiles, in particular to a variable displacement oil pump control method.
Background
The fuel economy is an important index for evaluating the technical advancement of the engine, in the process of engine development in the past, a constant displacement pump is often adopted, the displacement of an oil pump is determined according to the limit working condition of the engine, and the displacement is invariable, so when the engine works under the conventional working condition, on one hand, the pressure of the oil is far higher than the requirement of the engine, and on the other hand, a large amount of oil flows back to an oil pan from a relief valve of an oil pump because the oil does not participate in lubrication; the two aspects lead to the problem of high oil consumption caused by the excessive capability of the oil pump when the engine works under the conventional working condition.
The variable displacement oil pump is adopted to replace the existing quantitative oil pump in the prior art, but after the variable displacement oil pump is adopted, the pump oil quantity of the variable displacement oil pump can be adjusted, so that a foundation is provided for ensuring the fuel economy, but how to set the displacement of the variable displacement oil pump according to the actual situation enables the fuel economy to be reflected to the maximum extent, and no relevant solution is provided in the prior art.
Disclosure of Invention
The invention aims to: the control method of the variable displacement oil pump is provided, and the fuel economy is reflected to the maximum extent by controlling the pump oil pressure of the variable displacement oil pump.
The invention provides a variable displacement oil pump control method, which comprises the following steps:
after the engine is started, the ECU acquires an actual temperature value T1 of the coolant and compares the actual temperature value T1 with a preset coolant temperature value T1, if T1 is smaller than T1, the ECU acquires an actual temperature value T2 of the engine oil and judges whether T2 is located between a first preset engine oil temperature value T2 and a second preset engine oil temperature value T3, if T2 is smaller than T2 and smaller than T3, the ECU executes a normal temperature control strategy, wherein T1 is 115 ℃, T2 is 20 ℃, and T3 is 120 ℃;
the normal temperature control strategy comprises the following steps: the ECU acquires the percentage a1 of the current load of the engine and the maximum design load of the engine and the normal-temperature working condition corresponding to the current rotating speed n1 of the engine, adjusts the pumping pressure of the variable displacement oil pump according to the normal-temperature working condition, and after a preset time T, the ECU acquires the actual oil pressure P of the main oil gallery and compares the actual oil pressure P with the preset normal-temperature pumping pressure P10, and if the actual oil pressure P is not equal to the preset normal-temperature pumping pressure P10
Figure BDA0002143343910000021
The ECU retrieves the actual temperature value T1 of the coolant and compares it with the preset coolant temperature value T1, where the normal temperature condition is the correspondence between different a1 and different n1 and different P10.
As a preferred technical scheme of the variable displacement oil pump control method, the normal temperature working condition comprises the following steps:
under the first normal temperature working condition, wherein a1 is less than 54.5%, n1 is less than 3300r/min, and P10 is 1.7 bar;
under the second normal temperature working condition, a1 is more than or equal to 54.5 percent, n1 is less than 3000r/min, and P10 is 2.6 bar;
a third normal temperature working condition, wherein a1 is less than 45.5%, 3300r/min is not less than n1 and is less than 4500r/min, and P10 is 2.8 bar;
under the fourth normal temperature working condition, a1 is more than or equal to 54.5 percent, n1 is more than or equal to 3000r/min and is more than 3300r/min, and P10 is 3.3 bar;
under a fifth normal temperature working condition, wherein a1 is more than or equal to 45.5 percent, 3300r/min is more than or equal to n1 and less than 4500r/min, and P10 is 3.3 bar;
and in the sixth normal-temperature working condition, a1 is an arbitrary value, n is more than or equal to 4500r/min, and P10 is 3.8 bar.
As a preferable technical scheme of the variable displacement oil pump control method,
if it is
Figure BDA0002143343910000022
The ECU executes a security protection strategy;
the security protection policy includes: the ECU acquires the percentage a2 of the current load of the engine and the maximum design load of the engine and the safety protection working condition corresponding to the current rotating speed n2 of the engine, and adjusts the pump oil pressure of the variable displacement oil pump to the preset safety protection pump oil pressure P20 according to the safety protection working condition, wherein the safety protection working condition is the corresponding relation between different a2 and different n2 and different P20.
As a preferred technical scheme of the variable displacement oil pump control method, the safety protection working condition comprises the following steps:
a first safety protection working condition, wherein a2 is less than 54.5%, n2 is less than 3300r/min, and P20 is 1.7 bar;
and under the second safety protection working condition, a2 is more than or equal to 54.5 percent, n2 is more than 3300r/min, and P20 is 4.3 bar.
As a preferable technical scheme of the variable displacement oil pump control method,
the ECU acquires an actual temperature value T1 of the cooling liquid and compares the actual temperature value T1 with a preset cooling liquid temperature value T1, and if T1 is not less than T1, the ECU executes an overheating protection strategy;
the over-temperature protection strategy comprises: the ECU acquires the percentage a3 of the current load of the engine and the maximum design load of the engine and the overheat protection working condition corresponding to the current rotating speed n3 of the engine, and adjusts the pump oil pressure of the variable displacement oil pump to the preset overheat protection pump oil pressure P30 according to the overheat protection working condition, wherein the overheat protection working condition is the corresponding relation between different a3 and different n3 and different P30.
As a preferable technical scheme of the variable displacement oil pump control method, the overheat protection working condition comprises the following steps:
a first overheat protection working condition, wherein a3 is less than 54.5%, n3 is less than 3300r/min, and P30 is 2.2 bar;
under a second overheat protection working condition, wherein a3 is more than or equal to 54.5%, n3 is less than 3000r/min, and P30 is 3.1 bar;
a third overheat protection working condition, wherein a3 is less than 45.5%, 3300r/min is less than or equal to n3 and less than 4500r/min, and P30 is 3.3 bar;
under the fourth overheat protection working condition, a3 is more than or equal to 54.5 percent, n3 is more than or equal to 3000r/min and is more than 3300r/min, and P30 is 3.8 bar;
under the fifth overheat protection working condition, at the moment, a3 is more than or equal to 45.5 percent, 3300r/min is more than or equal to n3 and less than 4500r/min, and P30 is 3.8 bar;
and in the sixth overheat protection working condition, a3 is an arbitrary value, n3 is more than or equal to 4500r/min, and P30 is 4.3 bar.
As a preferred technical scheme of the variable displacement oil pump control method, if the ECU judges that T2 is not more than T2, the ECU executes a low-temperature control strategy;
the low temperature control strategy comprises: the ECU acquires the percentage a4 of the current load of the engine and the maximum design load of the engine and the low-temperature working condition corresponding to the current rotating speed n4 of the engine, adjusts the pumping pressure of the variable displacement oil pump according to the low-temperature working condition, and after a preset time T, the ECU acquires the actual oil pressure P of the main oil gallery and compares the actual oil pressure P with the preset low-temperature pumping pressure P40, and if the actual oil pressure P is not equal to the preset low-temperature pumping pressure P40, the ECU calculates the maximum
Figure BDA0002143343910000031
The ECU reacquires the actual temperature value T1 of the coolant and compares it with the preset coolant temperature value T1; if it is
Figure BDA0002143343910000032
The ECU executes a security protection strategy.
As a preferred technical scheme of the variable displacement oil pump control method, if the ECU determines that T2 is not less than T3, the ECU continuously determines the sizes of T2 and a third preset oil temperature value T4, wherein T4 is 140 ℃, and if T2 is less than T4, the ECU executes a high-temperature control strategy;
the high temperature control strategy comprises: the ECU acquires the percentage a5 of the current load of the engine and the maximum design load of the engine and the high-temperature working condition corresponding to the current rotating speed n5 of the engine, adjusts the pumping pressure of the variable displacement oil pump according to the high-temperature working condition, after the interval time T, the ECU acquires the actual oil pressure P of the main oil gallery and compares the actual oil pressure P with the preset high-temperature pumping pressure P50, and if the actual oil pressure P is not equal to the preset high-temperature pumping pressure P50
Figure BDA0002143343910000041
The ECU reacquires the actual temperature value T1 of the coolant and compares it with the preset coolant temperature value T1; if it is
Figure BDA0002143343910000042
The ECU executes a safety protection strategy, and the high-temperature working condition is the correspondence between different a5 and different n5 and different P50.
As a preferable technical scheme of the variable displacement oil pump control method, if the ECU judges that T2 is more than or equal to T4, the ECU gives an alarm through an alarm device.
As a preferable technical scheme of the variable displacement oil pump control method, in the process of starting the engine, when the ECU executes the safety protection strategy for the first time, the ECU records and stores the execution records of the ECU on the safety protection strategy once, if the ECU stores the execution records in the process of starting the engine for N times continuously, the ECU gives an alarm through an alarm device, and N is more than or equal to 5.
The invention has the beneficial effects that:
the invention provides a variable displacement oil pump control method, which comprises the following steps:
after the engine is started, the ECU acquires the actual temperature value of the cooling liquidT1 is compared with a preset coolant temperature value T1, if T1 is smaller than T1, the ECU obtains an actual temperature value T2 of the engine oil and judges whether T2 is located between a first preset engine oil temperature value T2 and a second preset engine oil temperature value T3, if T2 is smaller than T2 and smaller than T3, the ECU executes a normal temperature control strategy, wherein T1 is 115 ℃, T2 is 20 ℃ and T3 is 120 ℃; the normal temperature control strategy comprises the following steps: the ECU obtains the percentage a1 of the current load of the engine and the maximum design load of the engine and the normal temperature working condition corresponding to the current rotating speed n1 of the engine, adjusts the pumping pressure of the variable displacement oil pump according to the normal temperature working condition, after the preset time T is spaced, the ECU obtains the actual oil pressure P of the main oil gallery and compares the actual oil pressure P with the preset normal temperature pumping pressure P10, and if the actual oil pressure P is not equal to the preset normal temperature pumping pressure P10, the ECU obtains the percentage
Figure BDA0002143343910000051
The ECU retrieves the actual temperature value T1 of the coolant and compares it with the preset coolant temperature value T1, and the normal temperature condition is the corresponding relationship between different a1 and different n1 and different P10. When the engine oil temperature value is in a normal temperature state and the coolant temperature is below 115 ℃, the pump oil pressure of the variable oil pump is adjusted according to different engine speeds and engine loads, so that the pump oil pressure of the variable oil pump can adapt to different normal temperature working conditions, and the fuel economy is favorably realized.
Drawings
FIG. 1 is a schematic structural diagram of a variable displacement oil pump control system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a variable displacement oil pump control method in an embodiment of the invention;
FIG. 3 is a map of a normal temperature condition in the variable displacement oil pump control method according to the embodiment of the invention;
FIG. 4 is a map of the safety protection condition in the variable displacement oil pump control method according to the embodiment of the invention;
FIG. 5 is a map of the overheat protection condition in the variable displacement oil pump control method according to the embodiment of the present invention;
FIG. 6 is a map of low temperature conditions in the variable displacement oil pump control method in an embodiment of the present invention;
FIG. 7 is a map of high temperature conditions in the variable displacement oil pump control method in an embodiment of the present invention.
In the figure:
1. a variable displacement oil pump; 2. a proportional solenoid valve; 3. a main oil gallery; 4. an ECU; 5. an engine speed sensor; 6. an engine oil temperature sensor; 7. an engine oil pressure sensor; 8. a crankcase.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means 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 invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a variable displacement oil pump control system according to an embodiment of the present invention. The present embodiment provides a variable displacement oil pump control system that includes an ECU4, a proportional solenoid valve 2, an oil pressure sensor 7, an oil temperature sensor 6, an engine speed sensor 5, and a variable displacement oil pump 1. It is to be noted that the variable displacement oil pump 1 in the embodiment is specifically the map variable displacement oil pump 1.
Specifically, the ECU4 is connected to the proportional solenoid valve 2, the port P of the proportional solenoid valve 2 is connected to the main oil gallery 3, the port T of the proportional solenoid valve 2 is connected to the crankcase 8, the port a of the proportional solenoid valve 2 is connected to the signal oil port of the variable displacement oil pump 1, and the ECU4 performs stepless regulation on the pump oil pressure of the variable displacement oil pump 1 by controlling the opening degree of the proportional solenoid valve 2.
The ECU4 is further connected with an oil pressure sensor 7 and an oil temperature sensor 6 respectively, the oil pressure sensor 7 and the oil temperature sensor 6 are both disposed in the main oil gallery 3, the oil pressure sensor 7 is used for collecting the oil pressure in the main oil gallery 3 and sending the oil pressure to the ECU4, and the oil temperature sensor 6 is used for collecting the oil temperature in the main oil gallery 3 and sending the oil temperature to the ECU 4.
The ECU4 is also connected to the engine speed sensor 5, and measures the actual engine speed by the engine speed sensor 5 and sends it to the ECU 4. In the present embodiment, the ECU4 is also capable of reading engine load data of the engine through the CAN bus.
This variable displacement engine oil pump control system still includes alarm device, and ECU4 still is connected with alarm device, and the steerable alarm device of ECU4 sends out the warning, and alarm device can be alarm lamp and/or stereo set etc. and ECU4 accessible light and/or pronunciation send out warning prompt for warning driver lubricating system work appears unusually.
Referring to fig. 2, fig. 2 is a flowchart of a method for controlling a variable displacement oil pump according to an embodiment of the present invention. The present embodiment also provides a control method of the above-mentioned variable displacement oil pump control system, where the control method of the variable displacement oil pump includes:
after the engine is started, the ECU4 obtains an actual temperature value T1 of the coolant and compares the actual temperature value T1 with a preset coolant temperature value T1, if T1 is less than T1, the ECU4 obtains an actual temperature value T2 of the engine oil and judges whether T2 is located between a first preset engine oil temperature value T2 and a second preset engine oil temperature value T3, if T2 is less than T2 is less than T3, the ECU4 executes a normal temperature control strategy, wherein T1 is 115 ℃, T2 is 20 ℃, and T3 is 120 ℃. The normal temperature control strategy comprises the following steps: the ECU4 obtains the normal temperature working condition corresponding to the percentage a1 of the current load of the engine and the maximum design load of the engine and the current rotating speed n1 of the engine, the pump oil pressure of the variable displacement oil pump 1 is adjusted according to the normal temperature working condition, after the preset time T, the ECU4 obtains the actual oil pressure P of the main oil gallery 3 and compares the actual oil pressure P with the preset normal temperature pump oil pressure P10, and if the actual oil pressure P is not equal to the preset normal temperature pump oil pressure P10, the ECU 35
Figure BDA0002143343910000081
The ECU4 retrieves the actual temperature value T1 of the coolant and compares it with the preset coolant temperature value T1, i.e., enters the next control cycle. The normal temperature working conditions are the corresponding relations between different a1 and different n1 and different P10.
It is understood that the maximum design load of the engine, which is one of the specific parameters of the engine, may be stored in the ECU4 in advance. The ECU4 obtains a specific numerical value t2 through the oil temperature sensor 6, obtains a numerical value P through the oil pressure sensor 7, and obtains a normal numerical value through the engine speed sensor 5The current rotating speed value n1 of the engine under the warm working condition, and the specific load of the engine under the normal temperature working condition is obtained through the CAN bus. If it is
Figure BDA0002143343910000082
At this time, the ECU4 has adjusted the pump pressure of the variable displacement oil pump 1 to P10 or very close to P10, which can be regarded as the ECU4 has successfully adjusted the pump pressure of the variable displacement oil pump 1.
According to the control method of the variable displacement oil pump provided by the embodiment, when the oil temperature value is in a normal temperature state and the temperature of the cooling liquid is below 115 ℃, the pump oil pressure of the variable oil pump is adjusted according to different engine speeds and engine loads, so that the pump oil pressure of the variable oil pump can adapt to different normal temperature working conditions, and the fuel economy is favorably realized.
Referring to fig. 3, fig. 3 is a map of a normal temperature condition in the variable displacement oil pump control method according to the embodiment of the present invention. In fig. 3, the abscissa represents the rotational speed of the engine, the ordinate represents the load of the engine, and the maximum design load of the engine is 22bar, and the broken line in fig. 3 represents the actual maximum load of the engine for each engine rotational speed. In this embodiment, the normal temperature condition includes:
under the first normal temperature working condition, wherein a1 is less than 54.5%, n1 is less than 3300r/min, and P10 is 1.7 bar;
under the second normal temperature working condition, a1 is more than or equal to 54.5 percent, n1 is less than 3000r/min, and P10 is 2.6 bar;
a third normal temperature working condition, wherein a1 is less than 45.5%, 3300r/min is not less than n1 and is less than 4500r/min, and P10 is 2.8 bar;
under the fourth normal temperature working condition, a1 is more than or equal to 54.5 percent, n1 is more than or equal to 3000r/min and is more than 3300r/min, and P10 is 3.3 bar;
under a fifth normal temperature working condition, wherein a1 is more than or equal to 45.5 percent, 3300r/min is more than or equal to n1 and less than 4500r/min, and P10 is 3.3 bar;
and in the sixth normal temperature working condition, a1 is an arbitrary value, n1 is more than or equal to 4500r/min, and P10 is 3.8 bar.
It is understood that the specific values of a1, n1 and P10 can be set according to actual conditions for different engines and variable displacement oil pumps 1. In this embodiment, under the normal temperature condition, the oil saving effect of the WLTC (world light-duty test cycle) and the NEDC (new european driving) can be maximized by adjusting the pump oil pressure of the variable displacement oil pump 1 according to the actual engine speed and the actual engine load.
Alternatively, please continue to refer to fig. 2, if
Figure BDA0002143343910000091
The ECU4 implements a security protection strategy.
The security protection policy comprises: the ECU4 obtains a safety protection working condition corresponding to the percentage a2 of the current load of the engine and the maximum design load of the engine and the current rotating speed n2 of the engine, and adjusts the pump oil pressure of the variable displacement oil pump 1 to a preset safety protection pump oil pressure P20 according to the safety protection working condition, wherein the safety protection working condition is the corresponding relation between different a2 and different n2 and different P20.
Referring to fig. 4, fig. 4 is a map of a safety protection condition in the variable displacement oil pump control method according to the embodiment of the present invention. In fig. 4, the abscissa represents the rotational speed of the engine, the ordinate represents the load of the engine, and the maximum design load of the engine is 22bar, and the broken line in fig. 4 represents the actual maximum load of the engine for each engine rotational speed. In this embodiment, the safety protection operating mode includes:
a first safety protection working condition, wherein a2 is less than 54.5%, n2 is less than 3300r/min, and P20 is 1.7 bar;
and under the second safety protection working condition, a2 is more than or equal to 54.5 percent, n2 is more than 3300r/min, and P20 is 4.3 bar.
It should be noted that the present embodiment does not limit the specific values of a2, n2 and P20. Under the normal temperature condition, if
Figure BDA0002143343910000092
Indicating that the ECU4 has not successfully adjusted P to P10, the oil provided by the variable displacement oil pump 1 control system is able to support normal engine operation, but the system has a fault when it is in operationUnder the condition of ensuring that the NEDC meets the requirements of the regulations, the reliability of the engine is ensured as much as possible to be taken as the key point of control, and the engine is prevented from being damaged.
Optionally, with continued reference to fig. 2, the ECU4 obtains an actual temperature value T1 of the coolant and compares the actual temperature value with a preset coolant temperature value T1, and if T1 is greater than or equal to T1, the ECU4 executes an overheat protection strategy. The overheat protection strategy comprises: the ECU4 obtains the percentage a3 of the current load of the engine and the maximum design load of the engine and the overheat protection working condition corresponding to the current rotating speed n3 of the engine, and adjusts the pump oil pressure of the variable displacement oil pump 1 to the preset overheat protection pump oil pressure P30 according to the overheat protection working condition, wherein the overheat protection working condition is the corresponding relation between different a3 and different n3 and different P30.
Referring to fig. 5, fig. 5 is a map of the overheat protection condition in the control method of the variable displacement oil pump 1 according to the embodiment of the present invention. In fig. 5, the abscissa represents the rotational speed of the engine, the ordinate represents the load of the engine, and the maximum design load of the engine is 22bar, and the broken line in fig. 5 represents the actual maximum load of the engine for each engine rotational speed. In this embodiment, the overheat protection operating mode includes:
a first overheat protection working condition, wherein a3 is less than 54.5%, n3 is less than 3300r/min, and P30 is 2.2 bar;
under a second overheat protection working condition, wherein a3 is more than or equal to 54.5%, n3 is less than 3000r/min, and P30 is 3.1 bar;
a third overheat protection working condition, wherein a3 is less than 45.5%, 3300r/min is less than or equal to n3 and less than 4500r/min, and P30 is 3.3 bar;
under the fourth overheat protection working condition, a3 is more than or equal to 54.5 percent, n3 is more than or equal to 3000r/min and is more than 3300r/min, and P30 is 3.8 bar;
under the fifth overheat protection working condition, at the moment, a3 is more than or equal to 45.5 percent, 3300r/min is more than or equal to n3 and less than 4500r/min, and P30 is 3.8 bar;
and in the sixth overheat protection working condition, a3 is an arbitrary value, n3 is more than or equal to 4500r/min, and P30 is 4.3 bar.
When an overheat protection working condition occurs, the internal temperature of the engine is over-high, the pumping pressure of the variable displacement oil pump 1 is correspondingly increased, the control system of the variable displacement oil pump 1 is ensured to meet the lubricating requirement of the engine, the reliability of the engine is ensured, and the economical efficiency of fuel is also considered.
It should be noted that the present embodiment does not limit the specific values of a3, n3 and P30.
Alternatively, with continued reference to FIG. 2, if the ECU4 determines that T2 ≦ T2, the ECU4 executes the low temperature control strategy. The low temperature control strategy comprises: the ECU4 obtains the percentage a4 of the current load of the engine and the maximum design load of the engine and the low-temperature working condition corresponding to the current rotating speed n4 of the engine, the pumping pressure of the variable displacement oil pump 1 is adjusted according to the low-temperature working condition, after the preset time T, the ECU4 obtains the actual oil pressure P of the main oil gallery 3 and compares the actual oil pressure P with the preset low-temperature pumping pressure P40, and if the actual oil pressure P is not equal to the preset low-temperature pumping pressure P40, the ECU
Figure BDA0002143343910000111
The ECU4 retrieves the actual temperature value T1 of the coolant and compares it with the preset coolant temperature value T1; if it is
Figure BDA0002143343910000112
The ECU4 implements a security protection strategy.
Referring to fig. 6, fig. 6 is a map of low temperature operating conditions in the variable displacement oil pump control method according to the embodiment of the present invention. In fig. 6, the abscissa represents the rotational speed of the engine, the ordinate represents the load of the engine, and the maximum design load of the engine is 22bar, and the broken line in fig. 6 represents the actual maximum load of the engine for each engine rotational speed. In this embodiment, the low temperature conditions include:
a first low-temperature working condition, wherein a4 is less than 54.5%, n4 is less than 3300r/min, and P40 is 2.7 bar;
under the second low-temperature working condition, a4 is more than or equal to 54.5 percent, n4 is less than 3000r/min, and P40 is 3.6 bar;
a third low-temperature working condition, wherein a4 is less than 45.5%, 3300r/min is less than or equal to n4 and less than 4500r/min, and P40 is 3.8 bar;
a fourth low-temperature working condition, wherein a4 is more than or equal to 54.5 percent, n4 is more than or equal to 3000r/min and 3300r/min, and P40 is 4.3 bar;
under the fifth low-temperature working condition, at the moment, a4 is more than or equal to 45.5 percent, 3300r/min is more than or equal to n4 and less than 4500r/min, and P40 is 4.3 bar;
and in the sixth low-temperature working condition, a is an arbitrary value, n is more than or equal to 4500r/min, and P40 is 4.8 bar.
At this time, it is indicated that the engine oil temperature is low, and the engine temperature may need to be raised as soon as possible when the engine is just started, and the engine oil pressure needs to be increased correspondingly compared with the normal-temperature working condition. It should be noted that the present embodiment does not limit the specific values of a4, n4 and P40.
Alternatively, with continued reference to fig. 2, if the ECU4 determines that T2 is greater than or equal to T3, the ECU4 continues to determine the magnitudes of T2 and a third preset oil temperature value T4, T4 is 140 ℃, and if T2 < T4, the ECU4 executes the high temperature control strategy. The high temperature control strategy comprises: the ECU4 obtains the percentage a5 of the current load of the engine and the maximum design load of the engine and the high-temperature working condition corresponding to the current rotating speed n5 of the engine, the pumping pressure of the variable displacement oil pump 1 is adjusted according to the high-temperature working condition, after the interval time T, the ECU4 obtains the actual oil pressure P of the main oil gallery 3 and compares the actual oil pressure P with the preset high-temperature pumping pressure P50, and if the actual oil pressure P is not equal to the preset high-temperature pumping pressure P50, the
Figure BDA0002143343910000121
The ECU4 retrieves the actual temperature value T1 of the coolant and compares it with the preset coolant temperature value T1; if it is
Figure BDA0002143343910000122
The ECU4 executes a safing strategy with high temperature conditions being the correspondence between different a5 and different n5 and different P50.
Referring to fig. 7, fig. 7 is a map of a high-temperature working condition in the control method of the variable displacement oil pump 1 according to the embodiment of the present invention. In fig. 7, the abscissa represents the rotational speed of the engine, the ordinate represents the load of the engine, and the maximum design load of the engine is 22bar, and the broken line in fig. 7 represents the actual maximum load of the engine for each engine rotational speed. In this embodiment, the high temperature conditions include:
a first high-temperature working condition, wherein a5 is less than 54.5%, n5 is less than 3300r/min, and P50 is 2.2 bar;
under the second high-temperature working condition, a5 is more than or equal to 54.5 percent, n5 is less than 3000r/min, and P50 is 3.1 bar;
under the third high-temperature working condition, a5 is less than 45.5%, 3300r/min is less than or equal to n5 and less than 4500r/min, and P50 is 3.3 bar;
under the fourth high-temperature working condition, a5 is more than or equal to 54.5 percent, n5 is more than or equal to 3000r/min and is more than 3300r/min, and P50 is 3.8 bar;
under the fifth high-temperature working condition, a5 is more than or equal to 45.5 percent, 3300r/min is more than or equal to n5 and less than 4500r/min, and P50 is 3.8 bar;
and in the sixth high-temperature working condition, a5 is an arbitrary value, n5 is more than or equal to 4500r/min, and P50 is 4.3 bar.
At this time, it is stated that the engine temperature is high and normal operation of the engine needs to be ensured, but the pump oil pressure of the variable displacement oil pump 1 is not opened to the maximum in comparison with the normal temperature conditions corresponding to the specific conditions a5 and n5, and at this time, the normal operation of the engine is ensured while the oil consumption is also considered. It should be noted that the present embodiment does not limit the specific values of a5, n5 and P50.
Alternatively, with continued reference to FIG. 2, if the ECU4 determines that T2 ≧ T4, the ECU4 issues a warning via a warning device. At this time, the oil temperature exceeds the allowable upper limit temperature, and normal lubrication cannot be provided, so the ECU4 warns the driver of a failure of the control system of the variable displacement oil pump 1 through a warning device.
Optionally, with continued reference to fig. 2, during the engine start, when the ECU4 executes the safety protection strategy for the first time, the ECU4 records and stores the execution record of the safety protection strategy executed by the ECU4, and if the execution records are stored in the ECU4 during N consecutive engine starts, the ECU4 sends an alarm through the alarm device, where N is greater than or equal to 5. Although the normal operation of the engine is not affected by the fault of the control system of the variable displacement oil pump 1 when the engine is in the safety protection working condition, after the engine is started and stopped for N times continuously, the control system of the variable displacement oil pump 1 needs to execute the safety protection working condition, and the fault of the control system of the variable displacement oil pump 1 is considered not accidental and needs to be thoroughly checked to prevent a safety accident in the driving process. It will be appreciated that if ECU4 does not store an execution record at least once during N consecutive engine starts, ECU4 does not issue a warning via a warning device.
According to the variable displacement oil pump control method provided by the embodiment, when the ECU4 executes a normal temperature control strategy, the pumping pressure of the variable oil pump 1 can adapt to different normal temperature working conditions, so that the fuel economy is favorably realized, when the ECU4 executes a low temperature control strategy, the temperature of the engine can be raised as soon as possible on the premise of ensuring the fuel economy, and when the ECU4 executes a high temperature control strategy, the normal work of the engine is ensured, and the fuel economy is also considered.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (6)

1. A variable displacement oil pump control method is characterized by comprising the following steps:
after the engine is started, the ECU acquires an actual temperature value T1 of the cooling liquid and compares the actual temperature value T1 with a preset cooling liquid temperature value T1, and if T1 is not less than T1, the ECU executes an overheating protection strategy; if T1 is less than T1, the ECU acquires an actual temperature value T2 of the engine oil and judges whether T2 is located between a first preset engine oil temperature value T2 and a second preset engine oil temperature value T3, if T2 is less than T2 is less than T3, the ECU executes a normal-temperature control strategy, and if the ECU judges that T2 is less than or equal to T2, the ECU executes a low-temperature control strategy, wherein T1 is 115 ℃, T2 is 20 ℃, and T3 is 120 ℃; if the ECU judges that T2 is not less than T3, the ECU continuously judges the sizes of T2 and a third preset engine oil temperature value T4, wherein T4 is 140 ℃, and if T2 is less than T4, the ECU executes a high-temperature control strategy;
the normal temperature control strategy comprises the following steps: the ECU acquires the percentage a1 of the current load of the engine and the maximum design load of the engine and the normal-temperature working condition corresponding to the current rotating speed n1 of the engine, adjusts the pump oil pressure of the variable displacement oil pump according to the normal-temperature working condition, and after the preset time T is spaced, the ECU acquiresThe actual oil pressure P of the main oil gallery is compared with the preset normal-temperature pump oil pressure P10, and if the actual oil pressure P is not the same as the preset normal-temperature pump oil pressure P
Figure FDA0002454411560000011
The ECU acquires the actual temperature value T1 of the cooling liquid again and compares the actual temperature value T1 with a preset cooling liquid temperature value T1, wherein the normal temperature working condition is the corresponding relation between different a1 and different n1 and different P10; if it is
Figure FDA0002454411560000012
The ECU executes a security protection strategy; the security protection policy includes: the ECU acquires the percentage a2 of the current load of the engine and the maximum design load of the engine and the safety protection working condition corresponding to the current rotating speed n2 of the engine, and adjusts the pump oil pressure of the variable displacement oil pump to the preset safety protection pump oil pressure P20 according to the safety protection working condition, wherein the safety protection working condition is the corresponding relation between different a2 and different n2 and different P20;
the over-temperature protection strategy comprises: the ECU acquires the percentage a3 of the current load of the engine and the maximum design load of the engine and the overheat protection working condition corresponding to the current rotating speed n3 of the engine, and adjusts the pump oil pressure of the variable displacement oil pump to the preset overheat protection pump oil pressure P30 according to the overheat protection working condition, wherein the overheat protection working condition is the corresponding relation between different a3 and different n3 and different P30;
the low temperature control strategy comprises: the ECU acquires the percentage a4 of the current load of the engine and the maximum design load of the engine and the low-temperature working condition corresponding to the current rotating speed n4 of the engine, adjusts the pumping pressure of the variable displacement oil pump according to the low-temperature working condition, and after a preset time T, the ECU acquires the actual oil pressure P of the main oil gallery and compares the actual oil pressure P with the preset low-temperature pumping pressure P40, and if the actual oil pressure P is not equal to the preset low-temperature pumping pressure P40, the ECU calculates the maximum
Figure FDA0002454411560000021
The ECU reacquires the actual temperature value T1 of the coolant and compares it with the preset coolant temperature value T1; if it is
Figure FDA0002454411560000022
The ECU executes a security protection strategy;
the high temperature control strategy comprises: the ECU acquires the percentage a5 of the current load of the engine and the maximum design load of the engine and the high-temperature working condition corresponding to the current rotating speed n5 of the engine, adjusts the pumping pressure of the variable displacement oil pump according to the high-temperature working condition, after the interval time T, the ECU acquires the actual oil pressure P of the main oil gallery and compares the actual oil pressure P with the preset high-temperature pumping pressure P50, and if the actual oil pressure P is not equal to the preset high-temperature pumping pressure P50
Figure FDA0002454411560000023
The ECU reacquires the actual temperature value T1 of the coolant and compares it with the preset coolant temperature value T1; if it is
Figure FDA0002454411560000024
The ECU executes a safety protection strategy, and the high-temperature working condition is the correspondence between different a5 and different n5 and different P50.
2. The variable displacement oil pump control method of claim 1, wherein the normal temperature condition comprises:
under the first normal temperature working condition, wherein a1 is less than 54.5%, n1 is less than 3300r/min, and P10 is 1.7 bar;
under the second normal temperature working condition, a1 is more than or equal to 54.5 percent, n1 is less than 3000r/min, and P10 is 2.6 bar;
a third normal temperature working condition, wherein a1 is less than 45.5%, 3300r/min is not less than n1 and is less than 4500r/min, and P10 is 2.8 bar;
under the fourth normal temperature working condition, a1 is more than or equal to 54.5 percent, n1 is more than or equal to 3000r/min and is more than 3300r/min, and P10 is 3.3 bar;
under a fifth normal temperature working condition, wherein a1 is more than or equal to 45.5 percent, 3300r/min is more than or equal to n1 and less than 4500r/min, and P10 is 3.3 bar;
and in the sixth normal temperature working condition, a1 is an arbitrary value, n1 is more than or equal to 4500r/min, and P10 is 3.8 bar.
3. The variable displacement oil pump control method of claim 1, wherein the safety protection condition comprises:
a first safety protection working condition, wherein a2 is less than 54.5%, n2 is less than 3300r/min, and P20 is 1.7 bar;
and under the second safety protection working condition, a2 is more than or equal to 54.5 percent, n2 is more than 3300r/min, and P20 is 4.3 bar.
4. The variable displacement oil pump control method of claim 1, wherein the over-temperature protection condition comprises:
a first overheat protection working condition, wherein a3 is less than 54.5%, n3 is less than 3300r/min, and P30 is 2.2 bar;
under a second overheat protection working condition, wherein a3 is more than or equal to 54.5%, n3 is less than 3000r/min, and P30 is 3.1 bar;
a third overheat protection working condition, wherein a3 is less than 45.5%, 3300r/min is less than or equal to n3 and less than 4500r/min, and P30 is 3.3 bar;
under the fourth overheat protection working condition, a3 is more than or equal to 54.5 percent, n3 is more than or equal to 3000r/min and is more than 3300r/min, and P30 is 3.8 bar;
under the fifth overheat protection working condition, at the moment, a3 is more than or equal to 45.5 percent, 3300r/min is more than or equal to n3 and less than 4500r/min, and P30 is 3.8 bar;
and in the sixth overheat protection working condition, a3 is an arbitrary value, n3 is more than or equal to 4500r/min, and P30 is 4.3 bar.
5. The variable displacement oil pump control method according to claim 1, wherein if the ECU determines that T2 is greater than or equal to T4, the ECU gives an alarm through an alarm device.
6. The variable displacement oil pump control method according to claim 1, wherein during the starting process of the engine, when the ECU executes the safety protection strategy for the first time, the ECU records and stores the execution record of the safety protection strategy by the ECU once, if the ECU stores the execution record during N times of continuous starting of the engine, the ECU gives an alarm through an alarm device, and N is larger than or equal to 5.
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