CN114575958A - Control method of engine oil pump and Electronic Control Unit (ECU) - Google Patents
Control method of engine oil pump and Electronic Control Unit (ECU) Download PDFInfo
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- CN114575958A CN114575958A CN202011373330.7A CN202011373330A CN114575958A CN 114575958 A CN114575958 A CN 114575958A CN 202011373330 A CN202011373330 A CN 202011373330A CN 114575958 A CN114575958 A CN 114575958A
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- oil pressure
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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
- F01M1/16—Controlling lubricant pressure or quantity
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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
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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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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
The application discloses a control method for reducing engine emission and an Electronic Control Unit (ECU), wherein the method comprises the following steps: controlling the oil pump to work at the maximum capacity within the first time after the engine is started; after the first time, continuously controlling the discharge capacity of the oil pump according to the rotating speed of the engine, the load of the engine and the actually measured oil pressure value so as to enable the pressure of the oil pump to reach a target oil pump pressure value; the target oil pressure value is determined from a speed of the engine and a load of the engine. Therefore, the method provided by the application has the advantages that the oil discharge capacity of the oil pump is continuously controlled, so that the matching degree of the oil discharge capacity of the oil pump and the requirements of various lubricating parts of the engine is high, and the waste of engine oil of the engine is reduced.
Description
Technical Field
The application relates to the field of engine control, in particular to a control method of an engine oil pump of an engine and an Electronic Control Unit (ECU).
Background
The displacement of the fixed displacement oil pump is determined by the rotating speed of the engine and cannot be adjusted according to the actual running condition of the engine. This means that the oil displacement of the fixed displacement oil pump and the requirements of various lubricated parts of the engine cannot be completely matched, resulting in waste of oil.
With the stricter emission and oil consumption of the engine in the market, various methods for reducing the emission of the engine are applied by various manufacturers. At present, in order to solve the problem of a fixed displacement oil pump, a two-stage variable oil pump is provided, the oil displacement of the two-stage variable oil pump can be changed in two stages, and compared with the fixed displacement oil pump, the variable oil pump has a changing space, but still has a larger difference with the requirement of each lubricating part of an engine which changes along with the time connection. This results in a certain amount of oil waste in the use of the two-stage variable oil pump.
Disclosure of Invention
In order to solve the technical problem, the application provides a control method of an engine oil pump and an Electronic Control Unit (ECU), and waste of engine oil is reduced.
In order to achieve the above purpose, the technical solutions provided in the embodiments of the present application are as follows:
the embodiment of the application provides a control method of an engine oil pump, which comprises the following steps:
controlling the oil pump to work at the maximum capacity within the first time after the engine is started;
after the first time, continuously controlling the discharge capacity of the oil pump according to the rotating speed of the engine, the load of the engine and the actually measured oil pressure value so as to enable the pressure of the oil pump to reach a target oil pump pressure value; the target oil pressure value is determined from a speed of the engine and a load of the engine.
Optionally, the controlling the displacement of the oil pump to be continuously changed according to the rotating speed of the engine, the load of the engine, the pressure of the oil and the temperature of the oil comprises:
obtaining the target engine oil pressure value according to the rotating speed of the engine and the load of the engine;
obtaining a first duty ratio value according to the target engine oil pressure value and the actual engine oil pressure value;
obtaining a second duty ratio value according to the target engine oil pressure value and the engine speed;
obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value;
and according to the actual duty ratio value, enabling the pressure of the oil pump to reach the pressure of the target oil pump.
Optionally, after obtaining the second duty ratio value according to the target engine oil pressure and the engine speed, the method further includes:
correcting the second duty ratio value according to the temperature of the engine oil to obtain a second duty ratio correction value;
obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value specifically includes:
and obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value correction value.
Optionally, the method further comprises:
obtaining a mapping relation among the rotating speed, the load and the target engine oil pressure value;
the obtaining the target engine oil pressure value according to the rotation speed of the engine and the load of the engine includes:
and obtaining a corresponding target engine oil pressure value according to the mapping relation, the rotating speed of the engine and the load of the engine.
Optionally, after the first time, the oil pump is controlled to operate at maximum capacity when any one of the following conditions occurs:
the system voltage is not within the preset working voltage range of the oil pump; alternatively, the first and second liquid crystal display panels may be,
the engine oil pressure sensor is out of order; alternatively, the first and second electrodes may be,
the temperature of the engine oil is greater than the safe temperature threshold of the engine oil; alternatively, the first and second electrodes may be,
and the actually measured engine oil pressure value is always lower than the engine oil pressure limit value within a second time threshold value, or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value.
Optionally, the measured engine oil pressure value is always lower than the engine oil pressure limit value within the second time threshold, or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value, and the engine oil pump is controlled to operate at the maximum capacity, including:
the measured engine oil pressure value is always lower than the engine oil pressure limit value in unit time or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value, and the engine oil pump is controlled to work at the maximum capacity in the next unit time;
when the actual engine oil pressure value is always lower than the engine oil pressure limit value or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value within N continuous unit time, the engine oil pump is controlled to work at the maximum capacity all the time; the N unit times are equal to the second time threshold.
Optionally, the method further comprises:
the piston cooling nozzle is controlled based on the coolant temperature, the intake air temperature, and the engine firing angle retard value.
Optionally, the controlling an electronically controlled piston cooling injector based on coolant temperature, intake air temperature, and engine firing angle retard value comprises:
(1) after the engine is started, when the temperature of the cooling liquid is smaller than a first temperature threshold value, controlling the piston cooling nozzle to be closed, and returning to the step (1); otherwise, entering the step (2);
(2) when the inlet air temperature is lower than a second temperature threshold value, controlling the opening and closing of the piston cooling nozzle by a preset normal temperature control strategy, and entering the step (3); otherwise, controlling the opening and closing of the piston cooling nozzle by a preset high-temperature control strategy, and entering the step (3);
(3) when the ignition angle retarding value of the engine is larger than or equal to a first threshold value, controlling the piston cooling nozzle to be opened, and returning to the step (3); otherwise, returning to the step (1).
The embodiment of the application also provides an Electronic Control Unit (ECU) on the vehicle, wherein the ECU is used for:
by adopting the method, the oil pressure of the oil pump is controlled.
Optionally, the ECU is further configured to:
and controlling the opening and closing of the piston cooling nozzle by adopting the method.
According to the technical scheme, the method has the following beneficial effects:
the embodiment of the application provides a control method for reducing engine emission, which comprises the following steps: controlling the oil pump to work at the maximum capacity within the first time after the engine is started; after the first time, continuously controlling the discharge capacity of the oil pump according to the rotating speed of the engine, the load of the engine and the actually measured oil pressure value so as to enable the pressure of the oil pump to reach a target oil pump pressure value; the target oil pressure value is determined from a speed of the engine and a load of the engine. Therefore, the method provided by the application has the advantages that the oil pump discharge capacity is continuously controlled, so that the matching degree of the oil discharge capacity of the oil pump and the requirements of various lubricating parts of the engine is high, and the waste of engine oil of the engine is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for controlling an engine oil pump according to an embodiment of the present disclosure;
FIG. 2 is a flow chart of a method for controlling the continuous variation of the displacement of the oil pump according to an embodiment of the present disclosure;
fig. 3 is a mapping relationship diagram of a rotation speed, a load and a target engine oil pressure value according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram illustrating a method for controlling continuous variation of a displacement of an oil pump according to an embodiment of the present disclosure;
FIG. 5 is a flow chart of a method of controlling a piston cooling nozzle provided in an embodiment of the present application;
FIG. 6 is a line graph illustrating a control strategy for a piston cooling nozzle according to an embodiment of the present disclosure;
fig. 7 is a structural diagram of an electronic control unit ECU on a vehicle according to an embodiment of the present application;
fig. 8 is a structural diagram of an electronic control unit ECU in a vehicle according to an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the drawings are described in detail below.
It should be understood that the terms "first", "second", "third", and "fourth" in the embodiments of the present application are for convenience of description only, and do not limit the present application.
The application provides a control method of an engine oil pump, which enables the oil displacement of the engine oil pump to be higher in matching degree with the requirements of various lubricating parts of an engine, so that the waste of engine oil of the engine is reduced, and the method provided by the embodiment of the application is introduced by combining with the attached drawings.
Referring to fig. 1, a flow chart of a control method of an engine oil pump according to the present application is schematically shown.
In the present embodiment, the method shown in FIG. 1 can be implemented, for example, by the following steps S101-S102.
S101: and controlling the oil pump to work at the maximum capacity in the first time after the engine is started.
It will be appreciated that in order to quickly build up oil pressure, the safety of the engine is ensured. In the first time before each start of the engine, the engine will be forced to operate at maximum capacity. Wherein the first time is related to the oil temperature at the moment of start-up, for example: when the engine oil temperature at the starting time is-40 ℃, the first time can be set to 40 s; when the engine oil temperature at the starting time is-20 ℃, the first time can be set to be 20 s; when the engine oil temperature at the starting time is-10 ℃, the first time can be set to 10 s; the first time may be set to 5s when the engine oil temperature at the start time is 0 ℃; when the engine oil temperature at the starting time is 130 ℃, the first time may be set to 5 s; when the temperature at the time of activation is between the two temperatures exemplified above, the first time may be set to a value between the first times to which the two temperatures respectively correspond.
In step S101, the control oil pump is operated at maximum capacity as the control oil pump is operated at maximum displacement, so that the pressure of the oil is rapidly increased.
S102: after the first time, continuously controlling the discharge capacity of the oil pump according to the rotating speed of the engine, the load of the engine and the actually measured oil pressure so as to enable the pressure of the oil pump to reach a target oil pump pressure value; the target oil pressure value is determined from a speed of the engine and a load of the engine.
In addition, the engine speed and the engine load described above are continuously changed in actual use. Therefore, the target oil pressure determined by both of these is also continuously changed. Therefore, according to the technical scheme of the application, the discharge capacity of the oil pump is continuously controlled according to the rotating speed of the engine, the load of the engine and the actually measured oil pressure, so that the pressure of the oil pump can be continuously changed, and the pressure of the oil pump can be consistent with the continuously changed pressure value of the target oil pump as far as possible.
The control method of the engine oil pump is an oil pump control method in the conventional operation of the engine. Next, the control method of the engine oil pump in 4 special cases will be described:
in the embodiment of the application, after the first time after the engine is started, the oil pump is controlled to work at the maximum capacity when any one of the following conditions occurs:
1. the system voltage is not within the preset working voltage range of the oil pump; alternatively, the first and second liquid crystal display panels may be,
2. the engine oil pressure sensor is out of order; alternatively, the first and second electrodes may be,
3. the engine oil temperature is greater than the engine oil safety temperature threshold; alternatively, the first and second liquid crystal display panels may be,
4. and the engine oil pressure is always lower than the engine oil pressure limit value within the second time threshold value, or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value.
It should be noted that, when the above four situations occur, the engine oil pump is forced to work at the maximum capacity, i.e. the maximum displacement, so as to ensure the pressure of the engine oil, thereby ensuring the safety of the engine,
as a possible implementation manner, the above case 4: the actually measured engine oil pressure value is always lower than the engine oil pressure limit value within the second time threshold value, or is always higher than the sum of the target engine oil pressure value and the preset target engine oil pressure fluctuation limit value, the engine oil pump is controlled to work with the maximum capacity, and the engine oil pressure value can be:
the measured engine oil pressure value is always lower than the engine oil pressure limit value in unit time or is always higher than the sum of the target engine oil pressure value and the preset target engine oil pressure fluctuation limit value, and the engine oil pump is controlled to work at the maximum capacity in the next unit time; when the actual engine oil pressure value is always lower than the engine oil pressure limit value or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value within N continuous unit time, the engine oil pump is controlled to work at the maximum capacity all the time; the N unit times are equal to the second time threshold.
The preset target oil pressure fluctuation limit value is an upper limit of a fluctuation value that is higher than the target oil pressure value for a long time in a normal state of the measured oil value. And if the measured engine oil pressure value is always lower than the engine oil pressure limit value or is always higher than the sum of the target engine oil pressure value and the preset target engine oil pressure fluctuation limit value in unit time, controlling the oil pump to work at the maximum capacity in the next unit time and counting to be 1. And judging again according to the actually measured engine oil pressure value in the next unit time, and circulating. If the measured engine oil pressure value is always higher than the sum of the target engine oil pressure value and the preset target engine oil pressure fluctuation limit value within N continuous unit time, namely the accumulated count reaches N, the continuous variable displacement engine oil pump is judged to have a fault, and in order to ensure the safety of the engine, the engine oil pump is forced to work at the maximum capacity all the time to ensure the engine oil pressure. As an example, the above-mentioned N unit times may be 5 unit times. The preset target oil pressure fluctuation limit may be 50 kPa.
Therefore, according to the method provided by the embodiment of the application, the discharge capacity of the oil pump is continuously controlled according to the rotating speed of the engine, the load of the engine and the actually measured oil pressure value, and the oil pump is controlled to work at the maximum capacity under special conditions so as to protect the safety of the engine. According to the embodiment of the application, the discharge capacity of the oil pump is continuously controlled, so that the pressure of the oil pump reaches the pressure of the target oil pump, the matching degree of the discharge capacity of the oil pump and the requirements of various lubricating parts of an engine is high, and the waste of engine oil of the engine is reduced.
Next, as a possible implementation manner, the embodiment of the present application will describe a specific implementation manner of step S102:
as shown in fig. 2, the figure is a flowchart of a method for controlling the continuous variation of the displacement of the oil pump according to the present application.
In the present embodiment, the method shown in fig. 2 can be implemented by the following steps S201 to S205, for example:
s201: and obtaining the target engine oil pressure value according to the rotating speed of the engine and the load of the engine.
The target oil pressure value is an ideal oil pressure value that is calculated from the engine speed and the engine load and that matches the requirements of the various lubricated parts of the engine.
As a possible implementation manner, step S201 may further include: and obtaining the mapping relation among the rotating speed, the load and the target engine oil pressure value.
When the mapping relationship among the rotation speed, the load, and the target oil pressure value is obtained, step S201 in the embodiment of the present application specifically includes:
and obtaining a corresponding target engine oil pressure value according to the mapping relation, the rotating speed of the engine and the load of the engine. Referring to fig. 3, the map is a mapping relationship diagram of the rotational speed, the load and the target oil pressure value provided by the present application. As shown in fig. 3, the abscissa represents the engine speed, the ordinate represents the engine load, the oil pressure zones corresponding to the engine speed and the engine load are different, the broken line represents the target oil pressure value, and the target oil pressure values are different in different oil pressure zones. Six zones are included in the graph, with different zones having different target oil pressure values. Therefore, the map can be used to determine the partition corresponding to the engine speed and the load of the engine, and the target oil pressure value of the partition can be obtained.
It should be noted that, in practical applications, the method provided in the embodiment of the present application is not limited to six partitions, and may also be other numbers of partitions, for example, three or seven partitions. The partition dividing manner may be determined according to actual requirements, and is not limited herein.
S202: and obtaining a first duty ratio value according to the target engine oil pressure value and the actual engine oil pressure value.
Specifically, in the embodiment of the present application, the first duty ratio is obtained according to a difference value between a target oil pressure value and a measured oil pressure value. The measured oil pressure value is obtained by reading real-time oil pressure measured by an oil pressure sensor in real time according to an Electronic Control Unit (ECU).
As a possible implementation manner, PID closed-loop adjustment may be performed on a difference value between the target engine oil pressure value and the actual engine oil pressure value, so as to obtain a first duty ratio value of the engine oil pump that needs to be changed by the PID closed-loop adjustment. It should be noted that, because the first duty ratio value only considers the target oil pressure value and the measured oil pressure value, and does not consider other factors affecting the displacement and the oil pressure of the oil pump, the first duty ratio value is a reference oil pump duty ratio value.
S203: and obtaining a second duty ratio value according to the target engine oil pressure value and the engine speed.
In the application, the target oil pressure and the engine speed are combined to obtain the preset second duty ratio value of the continuous variable displacement oil pump. It should be noted that the second duty ratio value is obtained by combining the target oil pressure and the engine speed, so that the second duty ratio value is an ideal value at a predetermined pressure and engine speed, but in an exemplary application, because a real system has a certain delay and other influencing factors, the pressure of the oil pump cannot be well reached to the target oil pump pressure value if the system is directly applied to the system.
As a possible implementation manner, in the embodiment of the present application, after the second duty ratio value is obtained, the second duty ratio value may be further corrected according to the temperature of the engine oil, so as to obtain a second duty ratio correction value. In practical applications, the inventors of the present application have found that the influence of the oil temperature on the oil pressure is also relatively large. In the embodiment of the present application, the second duty ratio value obtained in step S203 is corrected by using the oil temperature, and the second duty ratio that can be obtained is based on the correction value of the oil temperature.
S204: and obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value.
In the present application, combining the first duty value obtained in step S202 and the second duty value obtained in step S203 can make the obtained actual duty value take account of the timeliness of the first duty value and the accuracy of the second duty value.
As a possible implementation manner, when the oil temperature is adopted to correct the second duty ratio value in step S203, step S204 may be: and obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value correction value. The method also adds the engine oil temperature to the regulation of the oil pump discharge capacity, so that the engine can adapt to the environment with larger temperature change.
S205: and according to the actual duty ratio value, enabling the pressure of the oil pump to reach the pressure of the target oil pump.
In the embodiment of the present application, the actual duty ratio value obtained in step S204 is sent to the ECU unit, and then the ECU unit controls the output displacement of the oil pump according to the actual duty ratio value, so that the pressure of the oil pump reaches the target pressure of the oil pump.
As shown in fig. 4, fig. 4 is a schematic diagram of a method for controlling continuous variation of displacement of an oil pump according to an embodiment of the present disclosure.
In the embodiment of the present application, the method in fig. 4 may be embodied by steps S201 to S205. Fig. 4 is merely an aid to understanding as one possible implementation, and details of fig. 4 of the present application are not described herein.
Therefore, according to the method provided by the embodiment of the application, the first duty ratio value and the second duty ratio value are respectively obtained through different calculation methods according to the rotating speed of the engine, the load of the engine and the actually measured oil pressure value, and then the two duty ratio values are integrated to obtain the actual duty ratio value. According to the embodiment of the application, the discharge capacity of the oil pump is controlled according to the actual duty ratio value, so that the pressure of the oil pump reaches the pressure of the target oil pump, the matching degree of the discharge capacity of the oil pump and the requirements of various lubricating parts of an engine is high, and the waste of engine oil of the engine is reduced.
Based on the control method of the engine oil pump, the embodiment of the application further provides a control method of the piston cooling nozzle.
Referring to fig. 5, a flow chart of a method for controlling a piston cooling nozzle is provided.
In this embodiment, the method shown in fig. 5 can be summarized as follows: the piston cooling nozzle is controlled based on the coolant temperature, the intake air temperature, and the engine firing angle retard value.
It should be noted that, when the control method of the engine oil pump is used in combination with the control method of the piston cooling nozzle provided in the embodiment of the present application, efficient thermal management is achieved, and the oil discharge capacity of the engine oil pump can be more closely matched with the requirements of various lubricating parts of the engine, so that the waste of engine oil of the engine is reduced.
Specifically, the control method for the piston cooling nozzle provided by the embodiment of the application comprises the following steps:
(1) after the engine is started, when the temperature of the cooling liquid is smaller than a first temperature threshold value, controlling the piston cooling nozzle to be closed, and returning to the step (1); otherwise, step (2) is entered.
After the engine is started, for quick warming-up, when the temperature of the coolant is lower than a first temperature threshold value, the piston cooling nozzle is controlled to be closed. If the temperature of the coolant is greater than or equal to the first temperature threshold value, the engine and the warming-up are judged to be finished, and the step (2) is carried out. As one example, the first temperature threshold may be 40 ℃.
(2) When the inlet air temperature is lower than a second temperature threshold value, controlling the opening and closing of the piston cooling nozzle by a preset normal temperature control strategy, and entering the step (3); otherwise, controlling the opening and closing of the piston cooling nozzle by a preset high-temperature control strategy, and entering the step (3).
In the embodiment of the application, the control strategy of the piston cooling nozzle is judged according to the inlet air temperature.
FIG. 6 is a line graph illustrating a control strategy for a piston cooling nozzle according to an embodiment of the present application, as shown in FIG. 6.
Wherein, the solid line represents the target engine oil pressure, and the broken line represents the normal temperature control strategy control of the piston cooling nozzle; the dashed line represents the high temperature control curve for the piston cooling nozzle. The vertical axis of the line graph represents the engine load and the horizontal axis represents the engine speed.
When the point represented by the running state of the engine is above the corresponding control strategy curve, the piston cooling nozzle is controlled to be opened, and the nozzle performs oil injection; when the point represented by the operating state of the engine is below its corresponding control strategy curve, the control or plug-cooling nozzle is closed and no injection is performed by the nozzle. The normal-temperature control strategy curve and the high-temperature control strategy curve are determined jointly according to an engine piston temperature field experiment and a performance development experiment, and are designed to ensure that the piston temperature is within a bearable temperature range and reduce waste of engine oil of an engine. As one example, the second temperature threshold may be 35 ℃.
(3) When the ignition angle retarding value of the engine is larger than or equal to a first threshold value, controlling the piston cooling nozzle to be opened, and returning to the step (3); otherwise, returning to the step (1).
It should be noted that, in the normal operation process of the engine, the ignition angle retardation value of the engine is obtained, if the ignition angle retardation value is greater than or equal to the first threshold value, the piston nozzle is controlled to be opened so as to reduce the temperature of the piston, the combustion condition is changed, and the step (3) is returned; and (4) if the threshold value is smaller than the first threshold value, returning to the step (1).
Therefore, the method provided by the embodiment of the application controls the piston cooling nozzle through the temperature of the cooling liquid, the temperature of the intake air and the ignition angle delay value of the engine, and is combined with the control method of the engine oil pump provided by the embodiment of the application for use, so that the efficient thermal management is achieved, the matching degree of the oil discharge capacity of the oil pump and the requirements of various lubricating parts of the engine is higher, and the waste of the engine oil is reduced.
Based on the control method of the engine oil pump, the embodiment of the application also provides an electronic control unit ECU on the vehicle.
Fig. 7 is a structural view of an ECU in a vehicle according to the present application, as shown in fig. 7.
The electronic control unit ECU100 is configured to control the oil pressure of the oil pump 200 by the above-described control method for the engine oil pump.
Specifically, the method for controlling the engine oil pump 200 includes:
controlling the oil pump 200 to work at maximum capacity in the first time after the engine is started;
after the first time, continuously controlling the discharge capacity of the oil pump according to the rotating speed of the engine, the load of the engine and the actually measured oil pressure value so as to enable the pressure of the oil pump to reach a target oil pump pressure value; the target oil pressure value is determined from a speed of the engine and a load of the engine.
In this embodiment, the controlling the displacement of the oil pump to be continuously changed according to the rotation speed of the engine, the load of the engine, the pressure of the oil and the temperature of the oil includes:
obtaining the target engine oil pressure value according to the rotating speed of the engine and the load of the engine;
obtaining a first duty ratio value according to the target engine oil pressure value and the actual engine oil pressure value;
obtaining a second duty ratio value according to the target engine oil pressure and the engine rotating speed;
obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value;
and enabling the pressure of the oil pump to reach the pressure of the target oil pump according to the actual duty ratio value.
As a possible implementation manner, after obtaining the second duty ratio value according to the target engine oil pressure and the engine speed, the method further includes:
correcting the second duty ratio value according to the temperature of the engine oil to obtain a second duty ratio correction value;
obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value specifically includes:
and obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value correction value.
The method described above, further comprising:
obtaining a mapping relation among the rotating speed, the load and the target engine oil pressure value;
the obtaining the target engine oil pressure value according to the rotation speed of the engine and the load of the engine includes:
and obtaining a corresponding target engine oil pressure value according to the mapping relation, the rotating speed of the engine and the load of the engine.
Further, after the first time, the oil pump is controlled to operate at maximum capacity when any one of the following occurs:
the system voltage is not within the preset working voltage range of the oil pump; alternatively, the first and second electrodes may be,
the engine oil pressure sensor is out of order; alternatively, the first and second electrodes may be,
the temperature of the engine oil is greater than the safe temperature threshold of the engine oil; alternatively, the first and second electrodes may be,
and the actually measured engine oil pressure value is always lower than the engine oil pressure limit value within a second time threshold value, or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value.
Specifically, the measured engine oil pressure value is always lower than the engine oil pressure limit value within the second time threshold value, or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value, and the engine oil pump is controlled to work at the maximum capacity, including:
the measured engine oil pressure value is always lower than an engine oil pressure limit value in unit time or is always higher than the sum of a target engine oil pressure value and a preset target engine oil pressure fluctuation limit value, and the engine oil pump is controlled to work at the maximum capacity in the next unit time;
when the actual engine oil pressure value is always lower than the engine oil pressure limit value or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value within N continuous unit time, the engine oil pump is controlled to work at the maximum capacity all the time; the N unit times are equal to the second time threshold.
Based on the control method of the piston cooling nozzle, the embodiment of the application also provides an electronic control unit ECU on the vehicle.
Fig. 8 is a structural diagram of an ECU of a vehicle according to the present application, as shown in fig. 8.
The ECU100 is used to control the piston cooling nozzle 300 by the above-described control method of the piston cooling nozzle, in addition to the connection of the modules described with reference to fig. 7.
A method of controlling a piston cooling nozzle 300, comprising:
the piston cooling nozzle 300 is controlled according to the coolant temperature, the intake air temperature, and the engine ignition angle retard value.
Specifically, the method provided by this embodiment includes:
(1) after the engine is started, when the temperature of the cooling liquid is smaller than a first temperature threshold value, controlling the piston cooling nozzle 300 to be closed, and returning to the step (1); otherwise, entering the step (2);
(2) when the inlet air temperature is lower than a second temperature threshold value, controlling the piston cooling nozzle 300 to be opened and closed by a preset normal temperature control strategy, and entering the step (3); otherwise, controlling the piston cooling nozzle 300 to be opened and closed according to a preset high-temperature control strategy, and entering the step (3);
(3) when the engine ignition angle retardation value is greater than or equal to a first threshold value, controlling the piston cooling nozzle 300 to be opened, and returning to the step (3); otherwise, returning to the step (1).
As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that all or part of the steps in the above embodiment methods can be implemented by software plus a necessary general hardware platform. Based on such understanding, the technical solution of the present application may be essentially or partially implemented in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network communication device such as a media gateway, etc.) to execute the method according to the embodiments or some parts of the embodiments of the present application.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
It should also be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method of controlling an engine oil pump, the method comprising:
controlling the oil pump to work at the maximum capacity within the first time after the engine is started;
after the first time, continuously controlling the discharge capacity of the oil pump according to the rotating speed of the engine, the load of the engine and the actually measured oil pressure value so as to enable the pressure of the oil pump to reach a target oil pump pressure value; the target oil pressure value is determined from a speed of the engine and a load of the engine.
2. The method of claim 1, wherein said controlling the oil pump displacement to vary continuously as a function of engine speed, engine load, oil pressure, and oil temperature comprises:
obtaining the target engine oil pressure value according to the rotating speed of the engine and the load of the engine;
obtaining a first duty ratio value according to the target engine oil pressure value and the actual engine oil pressure value;
obtaining a second duty ratio value according to the target engine oil pressure value and the engine speed;
obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value;
and enabling the pressure of the oil pump to reach the pressure of the target oil pump according to the actual duty ratio value.
3. The method of claim 2, wherein after obtaining the second duty cycle value based on the target oil pressure and engine speed, further comprising:
correcting the second duty ratio value according to the temperature of the engine oil to obtain a second duty ratio correction value;
obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value specifically includes:
and obtaining an actual duty ratio value according to the first duty ratio value and the second duty ratio value correction value.
4. The method of claim 2, further comprising:
obtaining a mapping relation among the rotating speed, the load and the target engine oil pressure value;
the obtaining the target engine oil pressure value according to the rotation speed of the engine and the load of the engine includes:
and obtaining a corresponding target engine oil pressure value according to the mapping relation, the rotating speed of the engine and the load of the engine.
5. The method of claim 1, after the first time, controlling the oil pump to operate at maximum capacity when any one of:
the system voltage is not within the preset working voltage range of the oil pump; alternatively, the first and second electrodes may be,
the engine oil pressure sensor is out of order; alternatively, the first and second electrodes may be,
the temperature of the engine oil is greater than the safe temperature threshold of the engine oil; alternatively, the first and second electrodes may be,
and the actually measured engine oil pressure value is always lower than the engine oil pressure limit value within a second time threshold value, or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value.
6. The method of claim 5, wherein the measured oil pressure value is consistently below the oil pressure limit or consistently above a target oil pressure value and a preset target oil pressure fluctuation limit for a second time threshold, and controlling the oil pump to operate at maximum capacity comprises:
the measured engine oil pressure value is always lower than the engine oil pressure limit value in unit time or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value, and the engine oil pump is controlled to work at the maximum capacity in the next unit time;
when the actual engine oil pressure value is always lower than the engine oil pressure limit value or is always higher than the sum of the target engine oil pressure value and a preset target engine oil pressure fluctuation limit value within N continuous unit time, the engine oil pump is controlled to work at the maximum capacity all the time; the N unit times are equal to the second time threshold.
7. The method according to any one of claims 1-6, further comprising:
the piston cooling nozzle is controlled based on the coolant temperature, the intake air temperature, and the engine firing angle retard value.
8. The method of claim 7, wherein said controlling an electronically controlled piston cooling injector based on coolant temperature, intake air temperature, and engine firing angle retard value comprises:
(1) after the engine is started, when the temperature of the cooling liquid is smaller than a first temperature threshold value, controlling the piston cooling nozzle to be closed, and returning to the step (1); otherwise, entering the step (2);
(2) when the inlet air temperature is lower than a second temperature threshold value, controlling the opening and closing of the piston cooling nozzle by a preset normal temperature control strategy, and entering the step (3); otherwise, controlling the opening and closing of the piston cooling nozzle by a preset high-temperature control strategy, and entering the step (3);
(3) when the ignition angle retarding value of the engine is larger than or equal to a first threshold value, controlling the piston cooling nozzle to be opened, and returning to the step (3); otherwise, returning to the step (1).
9. An Electronic Control Unit (ECU) on a vehicle, the ECU configured to:
the method according to any one of claims 1 to 6, wherein the oil pressure of the oil pump is controlled.
10. The electronic control unit ECU of claim 9, wherein the ECU is further configured to:
the method of any one of claims 7 to 8, wherein the piston cooling nozzle is controlled to open and close.
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| CN114575958B (en) | 2023-03-31 |
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