CN117432499A - Control method and control system of lubrication system - Google Patents

Control method and control system of lubrication system Download PDF

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Publication number
CN117432499A
CN117432499A CN202311460399.7A CN202311460399A CN117432499A CN 117432499 A CN117432499 A CN 117432499A CN 202311460399 A CN202311460399 A CN 202311460399A CN 117432499 A CN117432499 A CN 117432499A
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China
Prior art keywords
engine
oil
state
oil pressure
smaller
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CN202311460399.7A
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Chinese (zh)
Inventor
刘成
欧阳丹
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Dongfeng Motor Group Co Ltd
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Dongfeng Motor Group Co Ltd
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Priority to CN202311460399.7A priority Critical patent/CN117432499A/en
Publication of CN117432499A publication Critical patent/CN117432499A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • F01M1/02—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
    • F01M1/02—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)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

The invention provides a control method of a lubrication system, which is applied to an engine of a vehicle, wherein the lubrication system comprises an oil pump, and the oil pump is a pressure feedback type variable displacement oil pump driven by a crankshaft, and the control method comprises the following steps: acquiring state data of an engine and oil pressure in a lubrication system to determine an operating state of the engine; when the running state of the engine is a cold start state, the rotating speed of the engine is made to be smaller than a first rotating speed threshold until the oil pressure is smaller than the first oil pressure threshold, and the control method can enable normal ignition in the cold start process of the engine and reduce the possibility of oil leakage caused by overlarge oil pressure in a lubrication system. The invention also provides a control system for realizing the control method.

Description

Control method and control system of lubrication system
Technical Field
The invention relates to the field of engine lubrication, in particular to a control method and a control system of a lubrication system.
Background
During lubrication of an engine, engine oil needs to be led to kinematic pairs of the engine through a lubrication system to lubricate the kinematic pairs of the engine through the engine oil, and in a cold start state of the engine, the lubrication system may have a risk of engine oil leakage due to excessive oil pressure.
Disclosure of Invention
The invention provides a control method and a control system of a lubrication system, which are used for solving the technical problem of how to reduce the possibility of engine oil leakage in a cold start state of an engine.
The embodiment of the invention provides a control method of a lubrication system, which is applied to an engine of a vehicle, wherein the lubrication system comprises an oil pump, and the oil pump is a pressure feedback type variable displacement oil pump driven by a crankshaft, and the control method comprises the following steps: acquiring state data of the engine and oil pressure in the lubrication system to determine an operating state of the engine; and when the running state of the engine is a cold start state, the rotating speed of the engine is made to be smaller than a first rotating speed threshold value until the oil pressure is smaller than a first oil pressure threshold value.
Further, acquiring state data of the engine and oil pressure in the lubrication system to determine an operating state of the engine; and when the running state of the engine is a cold start state, the rotating speed of the engine is made to be smaller than a first rotating speed threshold value until the oil pressure is smaller than a first oil pressure threshold value.
Further, the vehicle is a fuel vehicle, and when the running state of the engine is a cold start state, driving the crankshaft of the engine to rotate by the motor includes: and controlling the starting motor to drive the crankshaft of the engine to rotate.
Further, the vehicle is a hybrid vehicle, and when the running state of the engine is a cold start state, driving the crankshaft of the engine to rotate by the motor includes: and controlling the driving motor to drive the crankshaft of the engine to rotate.
Further, the making the rotation speed of the engine smaller than the first rotation speed threshold value when the operation state of the engine is a cold start state includes: when the running state of the engine is a cold start state, limiting the single fuel injection quantity of a fuel supply system of the engine to be smaller than a fuel quantity threshold value so as to ensure that the rotating speed of the engine is smaller than the first rotating speed threshold value; the control method further includes, when the engine operating state is a cold start state, making the engine rotational speed smaller than a first rotational speed threshold until the oil pressure is smaller than a first oil pressure threshold: and canceling the limitation of the single injection quantity of the oil supply system.
Further, the limiting the single injection amount of the fuel supply system of the engine to be less than the fuel amount threshold so that the rotational speed of the engine is less than the first rotational speed threshold includes: and limiting the single fuel injection quantity of the fuel supply system of the engine to be smaller than a fuel quantity threshold value, and controlling the motor to drive the crankshaft of the engine to rotate.
Further, the state data of the engine includes a rotational speed of the engine, and the acquiring the state data of the engine and the oil pressure in the lubrication system to determine the operating state of the engine includes: and acquiring the rotating speed of the engine and the oil pressure in the lubrication system, and determining the running state of the engine to be a cold start state in a state that the rotating speed of the engine is lower than a second rotating speed threshold and the oil pressure of the lubrication system is higher than a second oil pressure threshold, wherein the second rotating speed threshold is smaller than the first rotating speed threshold and the second oil pressure threshold is larger than the first oil pressure threshold.
The embodiment of the invention also provides a control system of the lubrication system, which is used for realizing the control method described in the above embodiment, and the control system comprises: an acquisition module for acquiring state data of the engine and oil pressure in the lubrication system to determine an operating state of the engine; and the control module is used for enabling the rotating speed of the engine to be smaller than a first rotating speed threshold value until the oil pressure is smaller than the first oil pressure threshold value when the running state of the engine is a cold start state.
Further, the control module is further configured to control the motor to drive the crankshaft of the engine to rotate and control the oil supply system of the engine to stop oil injection when the running state of the engine is a cold start state; the control module is also used for controlling the oil supply system of the engine to start oil injection and canceling the rotation speed limitation of the engine.
Further, the vehicle is a fuel vehicle, and the control module is further used for controlling the starting motor to drive the crankshaft of the engine to rotate.
Further, the vehicle is a hybrid vehicle, and the control module is further used for controlling the driving motor to drive the crankshaft of the engine to rotate.
Further, the control module is further configured to limit a single fuel injection amount of a fuel supply system of the engine to be less than a fuel amount threshold value when the running state of the engine is a cold start state, so that a rotation speed of the engine is less than the first rotation speed threshold value; the control module is also used for canceling the limitation of the single injection quantity of the oil supply system.
Further, the control module is also used for limiting the single fuel injection quantity of the fuel supply system of the engine to be smaller than a fuel quantity threshold value and controlling the motor to drive the crankshaft of the engine to rotate.
Further, the state data of the engine comprises the rotating speed of the engine, and the acquisition module is further used for acquiring the rotating speed of the engine and the oil pressure in the lubrication system; the control module is further configured to determine that an operating state of the engine is a cold start state in a state in which a rotational speed of the engine is lower than a second rotational speed threshold and an oil pressure of the lubrication system is greater than a second oil pressure threshold, where the second rotational speed threshold is smaller than the first rotational speed threshold and the second oil pressure threshold is greater than the first oil pressure threshold.
The embodiment of the invention provides a control method of a lubrication system, which is applied to an engine of a vehicle, wherein the lubrication system comprises an oil pump, the oil pump is a pressure feedback type variable displacement oil pump driven by a crankshaft, and the control method comprises the following steps: acquiring state data of an engine and oil pressure in a lubrication system to determine an operating state of the engine; in the case where the operating state of the engine is a cold start state, the rotational speed of the engine is made to be smaller than the first rotational speed threshold until the oil pressure is smaller than the first oil pressure threshold, it is understood that in the case where it is determined that the engine is in a cold start state, the cold start stage of the engine is divided into two stages, in the first stage, by restricting the rotational speed of the engine to restrict the oil pressure in the lubrication oil passage and provide sufficient time for the oil to flow from the main oil passage into the feedback oil chamber of the variable displacement oil pump, in the case where the oil pressure in the lubrication oil passage is smaller than the first oil pressure threshold, it is determined that the oil has flowed into the feedback oil chamber, and the oil pressure in the main oil passage has been able to be regulated, in the case where it is determined that the oil pressure in the lubrication oil passage is smaller than the first oil pressure threshold, the second stage of cold start is entered, the rotational speed restriction of the engine is canceled to enable the engine to be normally raised to an idle rotational speed, so that the oil pressure of the lubrication oil passage in the cold start process is reduced, and the possibility of leakage of the oil due to the oil pressure being excessively high is reduced.
Drawings
FIG. 1 is a schematic flow chart of a control method of a lubrication system according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for controlling a lubrication system according to an embodiment of the present invention;
FIG. 3 is a flow chart of another method for controlling a lubrication system according to an embodiment of the present invention;
FIG. 4 is a flow chart of another method for controlling a lubrication system according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control system of a lubrication system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The individual features described in the specific embodiments can be combined in any suitable manner, without contradiction, for example by combination of different specific features, to form different embodiments and solutions. Various combinations of the specific features of the invention are not described in detail in order to avoid unnecessary repetition.
In the following description, references to the term "first/second/are merely to distinguish between different objects and do not indicate that the objects have the same or a relationship therebetween. It should be understood that references to orientations of "above", "below", "outside" and "inside" are all orientations in normal use, and "left" and "right" directions refer to left and right directions illustrated in the specific corresponding schematic drawings, and may or may not be left and right directions in normal use.
It should be noted that 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The term "coupled," unless specifically indicated otherwise, includes both direct and indirect coupling.
In the following detailed description, the lubrication system of the engine may be applied to any type of engine, and by way of example, the lubrication system may be applied to a gasoline engine as well as a diesel engine; the lubrication system may be applied to any vehicle driven by an engine, and, as an example, the lubrication system may be applied to a car driven directly by an engine, and the lubrication system may also be applied to a truck driven directly by an engine. For convenience of explanation, the control method of the lubrication system will be described below by taking an example in which the lubrication system is applied to an engine that burns gasoline.
In some embodiments, the control method of the lubrication system is applied to an engine of a vehicle, the lubrication system comprises an oil pump, the oil pump is used for driving engine oil to flow, the oil pump is a pressure feedback type variable displacement oil pump driven by a crankshaft, namely, the oil pump is connected with the crankshaft of the engine, the rotating speed of the oil pump is in positive correlation with the rotating speed of the crankshaft of the engine, the higher the rotating speed of the oil pump is, the higher the flow rate of oil pumped by the oil pump is, so that the rising speed of oil pressure in a lubrication oil way is higher, meanwhile, the oil pump is a feedback type oil pump, the feedback type oil cavity is provided with a feedback type oil cavity, and concretely, the feedback type oil cavity is communicated by a main lubrication oil way, the oil pressure in the feedback type oil cavity is in positive correlation with the oil pressure of the main oil way, and when the oil pressure in the feedback type oil cavity is too high, a slider of the feedback type oil cavity can push a pump oil structure of the oil pump to overcome the elastic force of a return spring, so that the slider can push the pump oil structure of the pump, so that the eccentricity of a pump oil rotor is reduced, and the oil pressure in the main oil way is reduced, namely, the oil pressure in the main oil way is dynamically regulated by the oil pressure in the main oil way, so that the oil pressure in the main oil way is kept near the target oil pressure.
As shown in fig. 1, fig. 1 is a flow chart of a control method of a lubrication system according to an embodiment of the present invention, where the control method includes:
step S101, acquiring state data of the engine and oil pressure in the lubrication system to determine an operation state of the engine.
It is understood that whether the engine is in a cold start state is determined by state data of the engine and oil pressure of the lubrication system, and a method of determining whether the engine is in a cold start state is different depending on the state data of the engine, and the state data of the engine includes, as an example, a temperature of cooling water in a cooling water jacket of an engine block, and the engine is determined to be in a cold start state in a state in which the temperature of the cooling water is lower than a preset temperature threshold and the oil pressure in the lubrication system is higher than the preset threshold; the state data of the engine includes, for example, a rotational speed of the engine, and the engine is determined to be in a cold start state in a state in which the rotational speed of the engine is lower than a preset rotational speed threshold value and the oil pressure in the lubrication oil passage is higher than a preset oil pressure threshold value.
Step S102, when the engine is in a cold start state, the rotating speed of the engine is made to be smaller than a first rotating speed threshold value until the oil pressure is smaller than the first oil pressure threshold value.
It can be understood that when the engine is in a cold start state, the oil temperature of the engine oil is low and the viscosity is high, if the engine is started normally and the rotation speed is quickly pulled up to the idle rotation speed, the rotation speed of the engine oil pump is quickly increased, so that the oil pressure in the engine oil path is excessively high, and the leakage of the engine oil is possibly caused, and because the viscosity of the engine oil is high, the flow speed of the engine oil is slow, so that the engine oil is not more than the oil pressure flowing into the feedback oil cavity of the engine oil pump from the main oil path in the cold start process, namely, the pressure feedback type variable displacement engine oil pump driven by the crankshaft needs a period of time to enable the oil pressure in the main oil path to be reduced.
The embodiment of the invention provides a control method of a lubrication system, which is applied to an engine of a vehicle, wherein the lubrication system comprises an oil pump, the oil pump is a pressure feedback type variable displacement oil pump driven by a crankshaft, and the control method comprises the following steps: acquiring state data of an engine and oil pressure in a lubrication system to determine an operating state of the engine; in the case where the operating state of the engine is a cold start state, the rotational speed of the engine is made to be smaller than the first rotational speed threshold until the oil pressure is smaller than the first oil pressure threshold, it is understood that in the case where it is determined that the engine is in a cold start state, the cold start stage of the engine is divided into two stages, in the first stage, by restricting the rotational speed of the engine to restrict the oil pressure in the lubrication oil passage and provide sufficient time for the oil to flow from the main oil passage into the feedback oil chamber of the variable displacement oil pump, in the case where the oil pressure in the lubrication oil passage is smaller than the first oil pressure threshold, it is determined that the oil has flowed into the feedback oil chamber, and the oil pressure in the main oil passage has been able to be regulated, in the case where it is determined that the oil pressure in the lubrication oil passage is smaller than the first oil pressure threshold, the second stage of cold start is entered, the rotational speed restriction of the engine is canceled to enable the engine to be normally raised to an idle rotational speed, so that the oil pressure of the lubrication oil passage in the cold start process is reduced, and the possibility of leakage of the oil due to the oil pressure being excessively high is reduced.
In some embodiments, as shown in fig. 2, fig. 2 is a flow chart of another control method of a lubrication system according to an embodiment of the present invention, where the control method shown in fig. 1 is different, and step S102 in fig. 1 includes:
step 201, when the running state of the engine is a cold start state, the motor is controlled to drive the crankshaft of the engine to rotate, and the oil supply system of the engine is controlled to stop oil injection until the oil pressure is less than a first oil pressure threshold.
It is understood that, when the engine is in a cold start state, the motor is controlled to drive the crankshaft of the engine to rotate, so that the oil pump can obtain power from the crankshaft of the engine, so that the oil pump can pump engine oil in the lubricating oil path to flow, and at the same time, the oil supply system of the engine is controlled to stop oil injection, that is, the oil supply system does not supply oil to the combustion chamber of the engine, so that the engine is temporarily in a non-ignition state and the crankshaft of the engine is driven to rotate by the motor connected with the crankshaft of the engine, and the rotating speed of the engine is lower than the first rotating speed threshold by limiting the rotating speed of the motor. The motor for driving the crankshaft of the engine to rotate can be of different types according to different types of vehicles, and in an exemplary state that the vehicle is a fuel vehicle, the vehicle is not provided with a driving motor directly connected with the crankshaft of the engine, the motor capable of driving the crankshaft of the engine to rotate is a starting motor, and the starting claw of the starting motor is controlled to pop up and be combined with a flywheel of the engine, so that the crankshaft of the engine can be driven to rotate; in an exemplary embodiment, in a state in which the vehicle is a hybrid vehicle, the hybrid vehicle has a drive motor connected to a crankshaft of the engine, and in a state in which the engine is cold-started, the crankshaft of the engine is rotated by controlling the drive motor, that is, the drive motor will be made to function as a starter motor during cold-starting of the engine, and the rotational speed of the engine is made to be lower than a first rotational speed threshold by limiting the rotational speed of the drive motor. Alternatively, in the state that the engine is a diesel engine, only the oil supply system of the engine is controlled to stop oil injection, and in the state that the engine is a gasoline engine, the oil supply system of the engine is controlled to stop oil injection, and the ignition system of the engine is also controlled to stop ignition.
Meanwhile, after step S201, the control method further includes:
in step S202, the oil supply system of the engine is controlled to start oil injection, and the rotation speed limitation of the engine is canceled.
It is understood that in a state where the oil pressure in the lubrication system falls below the first oil pressure threshold, the oil is considered to have flowed into the feedback chamber of the oil pump, and in this state, the oil pump can start to effectively regulate the oil pressure in the lubrication system, and in this state, the oil supply system is controlled to start to inject oil into the combustion system of the engine and cancel the rotational speed restriction of the engine, so that the engine can start to enter a steady light-off state, that is, the inertia of the crankshaft and flywheel of the engine can be made to satisfy the energy required for normally realizing the next stroke cycle, so that the engine can be made to operate steadily without rotating the crankshaft by the motor.
In some embodiments, as shown in fig. 3, fig. 3 is a flow chart of another control method of a lubrication system according to an embodiment of the present invention, unlike the control method shown in fig. 1, step S102 in fig. 1 includes:
in step S301, in a state where the engine is cold-started, a single injection amount of an oil supply system of the engine is limited to be smaller than a fuel amount threshold value, so that a rotation speed of the engine is smaller than a first rotation speed threshold value.
It is understood that the engine is initially brought into a light-off state by controlling the oil supply system of the engine to start oil injection, and at the same time, the energy generated by the combustion of fuel in a single stroke is limited by limiting the single oil injection amount of the oil supply system, so that the movement speed of the piston driven by the energy is limited, and the rotation speed of the crankshaft is limited below a first rotation speed threshold, that is, the rotation speed of the crankshaft of the engine is limited by limiting the oil amount provided by the single oil injection, so that the oil pressure in the lubrication system is limited.
In addition, when the first rotation speed threshold value can make the engine enter a stable ignition state, the starting motor of the engine is separated from the engine, or the driving motor stops to drive the crankshaft of the engine to rotate; when the first rotation speed can not make the engine enter a stable ignition state, the starting motor of the engine is combined with the flywheel of the engine or the driving motor drives the crankshaft of the engine to rotate while the single oil injection quantity of the oil supply system is limited, so that the crankshaft of the engine can continue to rotate in a state lower than the first rotation speed threshold value, and the engine is not flameout due to insufficient combustion energy.
Meanwhile, after step S301, the control method of the lubrication system further includes:
step S302, canceling the limitation of the single injection quantity of the oil supply system.
It is understood that by canceling the restriction of the single injection amount of the oil supply system, the engine can normally enter the steady light-off state, and canceling the restriction of the crankshaft rotation speed of the engine. Alternatively, in the case where the crankshaft of the engine needs to be rotated by the starter motor or the drive motor in step S301, the starter motor is separated from the flywheel of the engine or the drive motor is separated from the crankshaft of the engine while canceling the single injection amount to the oil supply system, so that the limitation of the rotational speed of the engine by the starter motor or the drive motor is canceled.
In some embodiments, the state data of the engine includes a rotational speed of the engine, as shown in fig. 4, fig. 4 is a flowchart of another control method of the lubrication system according to an embodiment of the present invention, unlike the control method shown in fig. 1, step S101 in fig. 1 includes:
step S401, acquiring the rotation speed of the engine and the oil pressure of the lubrication system, and determining that the operation state of the engine is a cold start state when the rotation speed of the engine is lower than a second rotation speed threshold and the oil pressure of the lubrication system is higher than the second oil pressure threshold.
Wherein the second rotational speed threshold is smaller than the first rotational speed threshold and the second oil pressure threshold is larger than the first oil pressure threshold, it is understood that in a state where the rotational speed of the engine is smaller than the second rotational speed threshold, the rotational speed of the engine is considered to be at an extremely low rotational speed so as to be considered to be in a starting state, the engine may be in a cold starting state or a hot starting state in this state, and in a hot starting state, the engine is restarted after a short stop period, the engine is in a hot starting state, the residual temperature of the engine still can keep the temperature of the engine oil at a higher level, and the viscosity of the engine oil is at a reduced level; restarting the engine after a long-time stop, wherein the engine is in a cold start state, the residual temperature of the engine is completely dissipated, the temperature of engine oil of the engine is in a low-temperature state, and the viscosity of the engine oil is at a very high level; in a state where the engine is at an extremely low rotational speed, if the engine is in a hot start state, the engine can quickly flow into the feedback chamber of the oil pump due to the low viscosity of the engine oil, so that the oil pressure in the lubrication system is not at a high level, and in a state where the engine is at an extremely low rotational speed and the oil pressure in the lubrication system is at a high level, it is determined that the engine is in a start state and that the engine is in a cold start state due to the high viscosity of the engine oil and the engine oil does not flow into the feedback chamber.
The embodiment of the invention also provides a control system of the lubrication system, which is used for the control method of the lubrication system shown in any one of fig. 1 to 4, wherein the control system can be a control unit of an engine, and the control system can also be a control unit of a whole vehicle.
In some embodiments, as shown in FIG. 5, the control system includes an acquisition module 100 and a control module 200, the acquisition module 100 being configured to acquire state data of the engine and oil pressure within the lubrication system to determine an operating state of the engine; the control module 200 is configured to cause the rotational speed of the engine to be less than a first rotational speed threshold until the oil pressure is less than a first oil pressure threshold when the engine is in a cold start condition. Optionally, in the case that the vehicle is a fuel vehicle, the control module 200 is further configured to control the starter motor to drive the crankshaft of the engine to rotate; optionally, in the case that the vehicle is a hybrid vehicle, the control module 200 is further configured to control the driving motor to rotate the crankshaft of the engine.
In some embodiments, as shown in fig. 5, the control module 200 is further configured to control the motor to rotate the crankshaft of the engine and control the oil supply system of the engine to stop injecting oil until the oil pressure is less than the first oil pressure threshold, and the control module 200 is further configured to control the oil supply system of the engine to start injecting oil and cancel the rotation speed limitation of the engine when the running state of the engine is a cold start state.
In some embodiments, as shown in fig. 5, the control module 200 is further configured to limit the single injection of the fuel supply system of the engine to less than the fuel amount threshold when the engine is in a cold start state, such that the rotational speed of the engine is less than the first rotational speed threshold; the control module 200 is also configured to cancel the restriction on the single injection amount of the oil supply system.
In some embodiments, as shown in FIG. 5, the acquisition module 100 is also used to acquire the rotational speed of the engine and the oil pressure of the lubrication system; the control module 200 is further configured to determine that the operating state of the engine is a cold start state in a state in which the rotational speed of the engine is below a second rotational speed threshold and the oil pressure of the lubrication system is greater than the second oil pressure threshold.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention.

Claims (10)

1. The control method of the lubrication system is characterized by being applied to an engine of a vehicle, wherein the lubrication system comprises an oil pump, and the oil pump is a pressure feedback type variable displacement oil pump driven by a crankshaft;
the control method comprises the following steps:
acquiring state data of the engine and oil pressure in the lubrication system to determine an operating state of the engine;
and when the running state of the engine is a cold start state, the rotating speed of the engine is made to be smaller than a first rotating speed threshold value until the oil pressure is smaller than a first oil pressure threshold value.
2. The control method according to claim 1, characterized in that said making the rotation speed of the engine smaller than a first rotation speed threshold value in a state where the operation state of the engine is a cold start state includes:
when the running state of the engine is a cold start state, controlling a motor to drive a crankshaft of the engine to rotate, and controlling an oil supply system of the engine to stop oil injection;
the control method further includes, when the engine operating state is a cold start state, making the engine rotational speed smaller than a first rotational speed threshold until the oil pressure is smaller than a first oil pressure threshold:
and controlling an oil supply system of the engine to start oil injection, and canceling the rotation speed limitation of the engine.
3. The control method according to claim 2, wherein the vehicle is a fuel vehicle, and wherein the rotating the crankshaft of the engine by the motor in the case where the running state of the engine is a cold start state includes:
and controlling the starting motor to drive the crankshaft of the engine to rotate.
4. The control method according to claim 2, wherein the vehicle is a hybrid vehicle, and wherein the rotating the crankshaft of the engine by the motor in the case where the running state of the engine is a cold start state includes:
and controlling the driving motor to drive the crankshaft of the engine to rotate.
5. The control method according to claim 1, characterized in that said making the rotation speed of the engine smaller than a first rotation speed threshold value in a state where the operation state of the engine is a cold start state includes:
when the running state of the engine is a cold start state, limiting the single fuel injection quantity of a fuel supply system of the engine to be smaller than a fuel quantity threshold value so as to ensure that the rotating speed of the engine is smaller than the first rotating speed threshold value;
the control method further includes, when the engine operating state is a cold start state, making the engine rotational speed smaller than a first rotational speed threshold until the oil pressure is smaller than a first oil pressure threshold:
and canceling the limitation of the single injection quantity of the oil supply system.
6. The control method according to claim 5, wherein the restricting the single injection amount of the fuel supply system of the engine to be smaller than the fuel amount threshold so that the rotation speed of the engine is smaller than the first rotation speed threshold includes:
and limiting the single fuel injection quantity of the fuel supply system of the engine to be smaller than a fuel quantity threshold value, and controlling the motor to drive the crankshaft of the engine to rotate.
7. The control method according to claim 1, wherein the state data of the engine includes a rotational speed of the engine, and the acquiring the state data of the engine and the oil pressure in the lubrication system to determine the operating state of the engine includes:
and acquiring the rotating speed of the engine and the oil pressure in the lubrication system, and determining the running state of the engine to be a cold start state in a state that the rotating speed of the engine is lower than a second rotating speed threshold and the oil pressure of the lubrication system is higher than a second oil pressure threshold, wherein the second rotating speed threshold is smaller than the first rotating speed threshold and the second oil pressure threshold is larger than the first oil pressure threshold.
8. A control system of a lubrication system, characterized in that the control system is adapted to implement the control method according to any one of claims 1 to 7, the control system comprising:
an acquisition module for acquiring state data of the engine and oil pressure in the lubrication system to determine an operating state of the engine;
and the control module is used for enabling the rotating speed of the engine to be smaller than a first rotating speed threshold value until the oil pressure is smaller than the first oil pressure threshold value when the running state of the engine is a cold start state.
9. The control system of claim 8, wherein the control module is further configured to control a motor to rotate a crankshaft of the engine and to control an oil supply system of the engine to stop injecting oil when the operating state of the engine is a cold start state;
the control module is also used for controlling the oil supply system of the engine to start oil injection and canceling the rotation speed limitation of the engine.
10. The control system of claim 9, wherein the vehicle is a fuel-fired vehicle, and wherein the control module is further configured to control a starter motor to rotate a crankshaft of the engine.
CN202311460399.7A 2023-11-03 2023-11-03 Control method and control system of lubrication system Pending CN117432499A (en)

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Application Number Priority Date Filing Date Title
CN202311460399.7A CN117432499A (en) 2023-11-03 2023-11-03 Control method and control system of lubrication system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311460399.7A CN117432499A (en) 2023-11-03 2023-11-03 Control method and control system of lubrication system

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CN117432499A true CN117432499A (en) 2024-01-23

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