CN111911262A - Engine oil pressure control method and corresponding engine protection device - Google Patents

Engine oil pressure control method and corresponding engine protection device Download PDF

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Publication number
CN111911262A
CN111911262A CN202011000972.2A CN202011000972A CN111911262A CN 111911262 A CN111911262 A CN 111911262A CN 202011000972 A CN202011000972 A CN 202011000972A CN 111911262 A CN111911262 A CN 111911262A
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China
Prior art keywords
engine
engine oil
oil pressure
preset
control unit
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CN202011000972.2A
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CN111911262B (en
Inventor
吴杨
刘学敏
史华东
袁立春
潘天川
杨帆
吴犇
刘策
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Zhejiang Xinchai Co ltd
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Zhejiang Xinchai Co ltd
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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
    • F01M1/18—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
    • F01M1/18—Indicating or safety devices
    • F01M1/20—Indicating or safety devices concerning lubricant pressure
    • F01M1/22—Indicating or safety devices concerning lubricant pressure rendering machines or engines inoperative or idling on pressure failure
    • 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
    • F01M1/22—Indicating or safety devices concerning lubricant pressure rendering machines or engines inoperative or idling on pressure failure
    • F01M1/24—Indicating or safety devices concerning lubricant pressure rendering machines or engines inoperative or idling on pressure failure acting on engine fuel system
    • 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
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/10—Indicating devices; Other safety devices

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

The invention discloses an engine oil pressure control method and a corresponding engine protection device, wherein when an engine normally works, if the engine oil pressure is smaller than a first pressure threshold value, timing is started, when the time length is longer than a first preset time length, the engine is protected according to a first preset relation, and a buzzer and an alarm lamp are activated simultaneously; if the engine oil pressure is greater than or equal to the first pressure threshold and less than the second pressure threshold, and the engine oil temperature is greater than the preset temperature threshold, the timing unit starts timing, the timing length is greater than the second preset time length, the engine is protected according to the second preset relation, and the buzzer and the alarm lamp are activated at the same time; if the engine oil pressure is greater than the third pressure threshold, the engine is protected according to a third preset relation when the timing duration is greater than a third preset duration, and meanwhile, the buzzer and the alarm lamp are activated. The invention has the advantages that: the engine oil pressure of the engine is monitored in real time, the engine is protected according to a preset strategy, and the actual use requirements of the vehicle are better met.

Description

Engine oil pressure control method and corresponding engine protection device
Technical Field
The invention relates to the technical field of engines, in particular to an engine oil pressure control method and a protection device of an engine.
Background
When the engine works normally, a reasonable oil pressure range must be maintained. If the engine oil pressure is too high, parts such as engine oil pipelines, oil seals and the like are easily damaged; if the oil pressure is too low, the friction surfaces of the moving parts are not lubricated enough, so that the abrasion of the kinematic pair is accelerated, and an engine connecting rod is locked under extreme conditions to damage the engine.
The engine oil pressure alarm device of current adopts resistance-type alarm and instrument engine oil pressure alarm lamp to be connected mostly, when engine oil pressure is low, triggers instrument engine oil pressure alarm lamp and lights the suggestion driver. The device mainly focuses on detecting the engine oil pressure and feeding back the engine oil pressure to a driver, and the engine cannot be protected actively.
The engine oil pressure alarm that traditional engine oil pressure alarm device adopted gathers the precision lower, and self permissible deviation reaches 0.02Mpa to traditional engine oil pressure alarm adopts the on-off formula to trigger, only when the engine oil pressure is less than the setting value, just can closed circuit trigger instrument engine oil pressure alarm lamp light. The engine oil pressure monitoring device has the defects that the engine oil pressure cannot be monitored in real time, the engine cannot be actively protected, and the problem of abnormal engine oil pressure cannot be found when an instrument is damaged or a driver does not notice an alarm lamp.
Disclosure of Invention
The invention aims to provide an engine oil pressure control method and an engine oil pressure protection device, aiming at the technical problems that the existing engine oil pressure alarm device cannot monitor the engine oil pressure of an engine in real time and cannot actively protect the engine.
The technical scheme for solving the technical problems is as follows: an engine oil pressure control method comprises the following steps:
firstly, comparing an engine oil pressure value acquired by an engine oil pressure signal acquisition unit in real time with a first pressure threshold, a second pressure threshold and a third pressure threshold preset in a control unit respectively;
when the engine oil pressure value is smaller than a first pressure threshold value, timing the holding time of the engine oil pressure value by a timing unit, if the holding time of the engine oil pressure value is smaller than a first preset time preset in a control unit, continuously acquiring the engine oil pressure value in real time, and if the holding time of the engine oil pressure value is larger than or equal to the first preset time preset in the control unit, limiting the working state of the engine according to a first preset relation preset in the control unit;
when the engine oil pressure value is greater than or equal to the first pressure threshold but less than the second pressure threshold, timing the holding time of the engine oil pressure value by a timing unit, if the holding time of the engine oil pressure value is less than a second preset time preset in the control unit, continuously acquiring the engine oil pressure value in real time, and if the holding time of the engine oil pressure value is greater than or equal to the second preset time preset in the control unit, limiting the working state of the engine according to a second preset relation preset in the control unit;
and when the engine oil pressure value is greater than a third pressure threshold value, timing the holding time of the engine oil pressure value by a timing unit, continuously acquiring the engine oil pressure value in real time if the holding time of the engine oil pressure value is less than a third preset time preset in the control unit, and limiting the engine speed and torque output according to a third preset relation preset in the control unit if the holding time of the engine oil pressure value is greater than or equal to the third preset time preset in the control unit.
Preferably, the engine oil temperature signal acquisition unit acquires the temperature of the engine oil in real time, continues to acquire the temperature of the engine oil in real time if the temperature of the engine oil is less than or equal to a preset engine oil temperature threshold, and limits the working state of the engine according to a second preset relationship if the temperature of the engine oil is greater than the preset engine oil temperature threshold.
Preferably, the control unit limits the working state of the engine according to a first preset relationship, specifically, the engine is stopped by controlling the fuel injection quantity and the target rotating speed of the engine, so as to achieve the purpose of actively protecting the engine;
the control unit limits the working state of the engine according to a second preset relation, and specifically limits the engine to run at an idle speed by controlling the fuel injection quantity and the target rotating speed of the engine so as to achieve the purpose of actively protecting the engine;
the control unit limits the working state of the engine according to a third preset relation, specifically, limits the torque of the engine to be 50% output by controlling the fuel injection quantity and the target rotating speed of the engine, and limits the rotating speed to be 500rpm lower than the current rotating speed of the engine; when the target rotating speed is lower than the idle rotating speed, setting the target rotating speed as the idle rotating speed; the purpose of actively protecting the engine is achieved; the current rotating speed of the engine is acquired through an engine rotating speed signal acquisition unit.
Preferably, when the control unit controls the working state of the engine according to a first preset relation, the buzzer alarms, and the engine oil alarm lamp is normally on; when the control unit controls the working state of the engine according to a second preset relation, the buzzer alarms, and the engine oil alarm lamp flashes; when the control unit limits the rotating speed and the torque output of the engine according to a third preset relation, the buzzer alarms, and the engine oil alarm lamp flashes.
An engine protection device for realizing the engine oil pressure control method comprises an information acquisition unit, a timing unit and a control unit, wherein the information acquisition unit comprises an engine oil pressure signal acquisition unit which acquires the engine oil pressure in real time; the method specifically comprises the following steps: when the control unit judges that the engine oil pressure is extremely low (the engine oil pressure value is smaller than a first pressure threshold value), timing t1 is started and the timing duration is provided for the control unit; when the control unit schedules that the engine oil pressure is lower (the oil pressure value is greater than or equal to the first pressure threshold and less than the second pressure threshold), starting timing t2 and providing the timing duration to the control unit; when the control unit judges that the engine oil pressure is too high (the engine oil pressure value is larger than a third pressure threshold value), timing t3 is started and the timing duration is provided for the control unit;
the control unit controls the power output of the engine according to different preset relations according to the engine oil pressure information of the engine so as to achieve the purpose of actively protecting the engine; the method specifically comprises the following steps: limiting the torque output of the engine by controlling the fuel injection quantity of the engine; the actual operating speed of the engine is limited by controlling the target engine speed.
Preferably, the information acquisition unit further comprises an engine oil temperature signal acquisition unit; the engine oil temperature signal acquisition unit can acquire engine oil temperature information in real time and provide the information for the control unit to judge.
Preferably, the information acquisition unit further comprises an engine rotating speed signal acquisition unit; the engine rotating speed signal acquisition unit can acquire the rotating speed information of the engine in real time and provide the information to the control unit for judgment.
As the optimization of the technical scheme, the device also comprises an alarm unit; the alarm unit comprises a buzzer and an engine oil pressure lamp.
Preferably, the alarm unit can remind the abnormal state of the engine through sound and light modes and can distinguish the abnormal state of the engine according to the difference of sound or light.
The invention has the beneficial effects that: the engine oil pressure of the engine is monitored in real time, the engine is protected according to a preset strategy, and the actual use requirements of the vehicle are better met.
Drawings
FIG. 1 is a process flow diagram of a control method of the present invention;
FIG. 2 is a schematic diagram of a signal acquisition unit of the present invention;
FIG. 3 is a schematic diagram of a timing unit and a control unit according to the present invention;
FIG. 4 is a schematic view of an alarm unit of the present invention;
in the figure, a00, an oil pressure acquisition unit; b00, an engine oil temperature acquisition unit; c00, an engine speed acquisition unit; d00, a timing unit; an E00 control unit; s10, a buzzer; s30 and an engine oil alarm lamp.
Detailed Description
As shown in fig. 1, the engine oil pressure protection control method includes:
step A100, obtaining an engine oil pressure value P in real time. The process of obtaining the engine oil pressure value P can be immediately started when the engine is started, and the whole working process of the engine is effectively protected. Of course, the process of obtaining the engine oil pressure value P is allowed to be started after the engine is started for a period of time, and the embodiment of the invention does not specifically require the specific time for obtaining the engine oil pressure value P.
In order to more accurately acquire real-time information of the engine and completely and effectively protect the whole working process of the engine, the process of acquiring the engine oil pressure value P of the engine can be acquired by an engine oil pressure sensor arranged on the engine. The engine oil pressure sensor adopted in the embodiment of the invention can acquire the engine oil pressure value P of the engine in real time, and certainly, for the engine with low part requirement, a method for periodically acquiring the engine oil pressure P and reporting the engine oil pressure P to the control unit can be adopted.
And step B200, acquiring the temperature T (k) of the engine oil in real time. The process of obtaining the engine oil temperature T (k) can be immediately started when the engine is started, and the whole working process of the engine is effectively protected. Of course, the process of obtaining the engine oil temperature t (k) is allowed to start after the engine is started for a period of time, and the embodiment of the invention does not specifically require the specific time for obtaining the engine oil temperature t (k).
In order to more accurately acquire real-time information of the engine and completely and effectively protect the whole working process of the engine, the process of acquiring the engine oil temperature T (k) of the engine can be acquired by an engine oil temperature sensor arranged on the engine. The engine oil temperature sensor adopted in the embodiment of the invention can acquire the engine oil temperature T (k) of the engine in real time, and certainly, for the engine with low requirements, a method for periodically acquiring the engine oil temperature T (k) and reporting the engine oil temperature T (k) to the control unit can be adopted.
And C300, acquiring the rotating speed RPM of the engine in real time. The process of obtaining the rotating speed RPM of the engine can be immediately started when the engine is started, and the whole working process of the engine is effectively protected. Of course, the process of obtaining the engine RPM may be allowed to start after the engine is started for a period of time, and the embodiment of the present invention does not require any specific time for obtaining the engine RPM.
In order to more accurately acquire the real-time information of the engine and completely and effectively protect the whole working process of the engine, the process of acquiring the rotating speed RPM of the engine, which is disclosed by the embodiment of the invention, can be acquired by a rotating speed sensor arranged on the engine. The rotating speed sensor adopted in the embodiment of the invention can acquire the rotating speed RPM of the engine in real time, and certainly, for the engine with low requirements, a method for periodically acquiring the rotating speed RPM of the engine and reporting the rotating speed RPM to the control unit can be adopted, so that the cost of the rotating speed acquisition unit of the engine can be reduced, but the influence that data cannot be continuously acquired is brought, and the actual use is influenced to a certain extent.
Next, the engine oil pressure value P acquired in step a100 is determined.
The first stage, this stage is mainly to protect the engine when engine oil pressure is extremely low.
Step A110, if the obtained engine oil pressure value P is lower than the preset first pressure threshold, step D400 is executed.
Step D400, the timing unit starts timing t1 and determines whether the timing t1 meets the requirements set by step D410 or step D420.
And D410, if the timing t1 is smaller than the first preset time, judging that the obtained engine oil pressure value P is lower than the preset first pressure threshold, and only occasionally failing. Returning to the step A100, and continuously acquiring the engine oil pressure value P.
And D420, if the timing t1 is greater than or equal to the first preset time, determining that the engine oil pressure value P is lower than the first pressure threshold value and lasts for a certain time, and the engine is at risk of damage. Step S110, step S210, and step S310 are executed.
And step S110, the buzzer prompts an operator that the engine state is abnormal in a buzzing alarm mode.
And step S210, limiting the working state of the engine by the engine control unit in a mode of limiting the fuel injection quantity, controlling the rotating speed of the engine and the like according to the first preset relation.
In order to avoid unnecessary loss caused by the fact that the engine continues to operate under the condition of extremely low engine oil pressure or engine oil leakage, the first preset relation can be set to be used for forcibly stopping the engine.
And step S310, the engine oil alarm lamp prompts an operator that the engine state is abnormal in a normally-on mode.
Obviously, if the obtained engine oil pressure value P is no longer less than the first pressure threshold, the engine oil pressure protection control method exits the first stage. Namely, the protection method in the step S110 is released, and the buzzer stops alarming; the protection method in the step S210 is removed, the engine is removed from the protection state, and the engine can be restarted and the power output can be controlled according to the requirement of an operator; and (5) the protection method in the step S310 is removed, and the engine oil alarm lamp is turned off.
And a second stage, which is mainly used for protecting the engine when the engine oil pressure is lower and the normal working temperature is reached.
Step A120, if the obtained engine oil pressure value P is greater than or equal to the first pressure threshold and is less than the second pressure threshold, then step D500 is executed.
Step D500, the timing unit starts timing t2 and determines whether the timing t2 meets the requirements set in step D510 or step D520.
And D510, if the timing t2 is smaller than the second preset time, determining that the obtained engine oil pressure value P is greater than or equal to the first pressure threshold and is smaller than the second pressure threshold, and only occasionally faults occur. Returning to the step A100, and continuously acquiring the engine oil pressure value P.
And D520, if the timing t2 is greater than or equal to the second preset time, determining that the obtained engine oil pressure value P is greater than or equal to the first pressure threshold and is smaller than the second pressure threshold at the same time, and the engine is damaged after a certain time.
At this time, the acquired information of the engine oil temperature t (k) starts to intervene in the control process, and it is determined whether the engine oil temperature t (k) meets the requirements of step B210 or step B220.
Step B210, if the engine oil temperature T (k) is greater than the preset engine oil temperature threshold, determining that the engine oil temperature T (k) reaches the temperature of the engine in normal operation, and performing the next operation by a control program;
step B220, if the obtained engine oil temperature T (k) is less than or equal to the preset engine oil temperature threshold, judging that the engine oil temperature T (k) does not reach the temperature when the engine works normally, the engine is not fully preheated, and returning to the step B200 to obtain the engine oil temperature T (k);
next, when step D520 is satisfied simultaneously, the timing t2 is greater than or equal to a second preset time period, and step B210, the engine oil temperature t (k) is greater than the preset oil temperature threshold. The engine oil pressure protection control method can judge that the engine oil temperature reaches the temperature requirement in normal working, the engine oil pressure is at a lower level and continuously works for a certain time, and in order to avoid damage to the engine and potential safety hazards caused by heavy-load work of the engine under the lower engine oil pressure level, the engine oil pressure protection control method provided by the invention is used for carrying out the next operation.
Next, in step S110, the buzzer prompts the operator that the engine state is abnormal in a buzzer alarm manner.
And S220, limiting the working state of the engine by the engine control unit in a mode of limiting the fuel injection quantity, controlling the rotating speed of the engine and the like according to the second preset relation.
In order to avoid unnecessary loss caused by the engine running under a heavy load when the engine oil pressure is low, the second preset relationship may be set to limit the engine speed to the idle speed.
And step S320, the engine oil alarm lamp prompts an operator that the engine state is abnormal in a flashing mode.
Obviously, if the obtained engine oil pressure value P no longer satisfies the condition of being greater than or equal to the second pressure threshold, the engine oil pressure protection control method of the present invention exits the second stage. Namely, the protection method in the step S110 is released, and the buzzer stops alarming; the protection method in the step S220 is removed, the engine is removed from the protection state, and the engine can output power according to the requirement of a driver; and (5) the protection method in the step S320 is removed, and the engine oil alarm lamp is turned off.
And in the third stage, the engine is protected mainly when the engine oil pressure is too high.
Step A130, if the obtained engine oil pressure value P is larger than a third pressure threshold, executing step D600.
Step D600, the timing unit starts timing t3 and determines whether the timing t3 meets the requirements set by step D610 or step D620.
And D610, if the timing t3 is smaller than the third preset time, judging that the obtained engine oil pressure value P is larger than a third pressure threshold value, and only occasionally failing. Returning to the step A100, and continuously acquiring the engine oil pressure value P.
And D620, if the timing t3 is greater than or equal to the third preset time, judging that the obtained engine oil pressure value P is greater than a third pressure threshold value, the engine oil pressure value P is too high and lasts for a certain time, and the parts such as an engine oil pipeline system and an oil seal are damaged.
At this time, the acquired engine speed RPM information starts an intervention control process.
Next, aiming at the condition that the engine oil pressure value P is greater than the preset third pressure threshold value and lasts for a certain time (the time t3 is greater than the preset time), the engine oil pressure protection control method protects the engine according to the following steps.
And step S110, the buzzer prompts an operator that the engine state is abnormal in a buzzing alarm mode.
And step S320, limiting the working state of the engine by the engine control unit according to the third preset relation in a mode of limiting the fuel injection quantity, controlling the rotating speed of the engine and the like.
In order to avoid damage to parts such as engine oil pipelines and oil seals caused by continuous working of the engine under the condition of high engine oil pressure, the third preset relationship can be set as a mapping relationship between the current rotating speed and the target rotating speed.
The third preset relation is set as a mapping relation between the current rotating speed of the engine and the target rotating speed and torque output, and the current rotating speed RPM of the engine is acquired through the engine rotating speed acquisition unit. The target engine speed is usually set to be 500rpm lower than the current engine speed (when the target engine speed is lower than the idle speed, the target engine speed is set to be the idle speed), and meanwhile, the engine torque output is controlled to be 50% of the normal state by controlling the fuel injection quantity of the engine.
And step S320, the engine oil alarm lamp prompts an operator that the engine state is abnormal in a flashing mode.
Obviously, after the actual rotation speed of the engine is adjusted according to the third preset relationship, the obtained engine oil pressure value P of the engine will decrease, and if the obtained engine oil pressure value P no longer meets the condition that the value is greater than or equal to the second pressure threshold, the engine oil pressure protection control method of the invention exits the second stage. Namely, the protection method in the step S110 is released, and the buzzer stops alarming; the protection method in the step S220 is removed, the engine is removed from the protection state, and the engine can output power according to the requirement of a driver; and (5) the protection method in the step S320 is removed, and the engine oil alarm lamp is turned off.
In addition, it should be noted that the specific description of the engine oil pressure protection control method in this example is performed according to the first stage, the second stage, the third stage and different steps. However, during actual operation, the process of acquiring the engine oil pressure P and the process of determining the engine oil pressure P are continuously performed.
In summary, in a specific embodiment of the engine oil pressure protection control method of the present invention, on the basis of obtaining the engine oil pressure value P, the engine oil temperature t (k), and the engine speed RPM in real time, the obtained engine oil pressure value P is determined, the actual state of the engine oil pressure value P is confirmed, and a corresponding protection method and a warning measure are taken, so as to facilitate more active protection of the engine.
Fig. 2 is a diagram of the information acquisition unit including:
a00, an oil pressure collecting unit for collecting the engine oil pressure information.
And B00, an engine oil temperature acquisition unit for acquiring engine oil temperature information.
And C00, an engine speed acquisition unit for acquiring engine speed information.
Fig. 3 is a diagram of the timing and control unit including:
d00, a timing unit, configured to start timing when the obtained engine oil pressure value P satisfies the following conditions:
the obtained engine oil pressure value P is smaller than the first pressure threshold value;
the obtained engine oil pressure value P is greater than or equal to the first pressure threshold value and is less than a second pressure threshold value;
and the obtained engine oil pressure value P is greater than the third pressure threshold value.
E00, a control unit, configured to store the preset first pressure threshold, the second pressure threshold, and the third pressure threshold, store the preset engine oil temperature threshold, store the first preset duration, the second preset duration, and the third preset duration, and store the first preset relationship, the second preset relationship, and the third preset relationship.
Meanwhile, the control unit judges the actual engine oil pressure state of the engine according to the acquired engine oil pressure value P, the acquired engine oil temperature value T (k), the acquired engine speed RPM and the time length t1, t2 and t3 timed by the timing unit. And controlling the power output state of the engine by controlling the fuel injection quantity, the target rotating speed and the like according to the determined actual engine oil pressure state of the engine according to the preset relation. And meanwhile, the alarm unit is controlled to give an alarm.
The first pressure threshold is lower than the minimum engine oil pressure statistic value when the whole engine works and is set to be 0.03Mpa in the embodiment;
the second pressure threshold is slightly lower than the minimum engine oil pressure statistic value when the engine works normally, and is set to be 0.1Mpa in the embodiment;
the third pressure threshold is slightly lower than the maximum pressure value which can be borne by the oil seal in the engine oil pipeline and the system, and is set to be 0.8Mpa in the embodiment;
the first preset duration is set as the predicted damage duration when the engine is in an extreme working condition (for example, engine oil leakage) and the kinematic pair is not effectively lubricated, and is set as 5 seconds in the embodiment;
the second preset duration is set to 300s in the embodiment;
the third preset time is set to 60s in the present embodiment;
the first preset relationship is set as a mapping relationship between the engine oil pressure state and the actual power output of the engine, the adjustment is carried out by controlling the oil injection quantity and the target rotating speed, and in the embodiment, the control unit controls the engine to stop and triggers the alarm unit when the engine is judged to be in an extremely low engine oil pressure state, so that the purpose of actively protecting the engine is achieved.
In the present embodiment, the second preset relationship is set to control the fuel injection amount and the target rotation speed of the engine when the engine is determined to be in a state of low engine oil pressure, and limit the rotation speed of the engine to the idle rotation speed, so as to actively protect the engine.
In the present embodiment, the third preset relationship is set to limit the torque of the engine to 50% output and limit the rotation speed to be 500rpm lower than the current rotation speed of the engine (when the target rotation speed is lower than the idle rotation speed, the third preset relationship is set to be the idle rotation speed) by controlling the fuel injection amount and the target rotation speed of the engine when the engine is determined to be in a state of high engine oil pressure, so as to achieve the purpose of actively protecting the engine.
The specific implementation method comprises the following steps:
and when the obtained engine oil pressure value P is smaller than the first pressure threshold value and lasts for a certain time (the timing time t1 is greater than or equal to the first preset time). And (4) judging that the engine is in a state of extremely low oil pressure, and the engine is not suitable for continuously running. And the control unit limits the working state of the engine according to the first preset relation and controls the alarm unit to give an alarm prompt at the same time.
And when the obtained engine oil pressure value P is greater than or equal to the first pressure threshold value and less than the second pressure threshold value and lasts for a certain time (the timing time t2 is greater than or equal to the second preset time), and the obtained engine oil temperature is greater than the preset engine oil temperature threshold value. And judging that the engine is in a state of low engine oil pressure, the engine is not suitable for high-load operation, and the control unit limits the working state of the engine according to the second preset relation and controls the alarm unit to give an alarm.
And when the obtained engine oil pressure value P is greater than a third pressure threshold value and lasts for a certain time (the timing time t3 is greater than or equal to the third preset time), judging that the engine is in a state of high engine oil pressure, and limiting the working state of the engine by the control unit according to the third preset relation and simultaneously controlling the alarm unit to give an alarm prompt in order to avoid damage to oil seal parts in an engine oil pipeline and a system of the engine and make the engine unsuitable for high-speed high-load operation.
Fig. 4 is a diagram of the alarm unit including:
and S10, a buzzer is used for alarming and reminding in a sound mode.
And S20, an engine oil alarm lamp for alarming and reminding in a light mode.
In the present embodiment, the S20 oil warning lamp is set to be in two states, normally on and flashing, to distinguish between different states of an engine oil pressure fault.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, there are variations on the embodiment and the application scope according to the idea of the present invention, and the content of the present description should not be construed as a limitation to the present invention.

Claims (9)

1. An engine oil pressure control method is characterized in that: the method comprises the following steps:
firstly, comparing an engine oil pressure value acquired by an engine oil pressure signal acquisition unit in real time with a first pressure threshold, a second pressure threshold and a third pressure threshold preset in a control unit respectively;
when the engine oil pressure value is smaller than a first pressure threshold value, timing the holding time of the engine oil pressure value by a timing unit, if the holding time of the engine oil pressure value is smaller than a first preset time preset in a control unit, continuously acquiring the engine oil pressure value in real time, and if the holding time of the engine oil pressure value is larger than or equal to the first preset time preset in the control unit, limiting the working state of the engine according to a first preset relation preset in the control unit;
when the engine oil pressure value is greater than or equal to the first pressure threshold but less than the second pressure threshold, timing the holding time of the engine oil pressure value by a timing unit, if the holding time of the engine oil pressure value is less than a second preset time preset in the control unit, continuously acquiring the engine oil pressure value in real time, and if the holding time of the engine oil pressure value is greater than or equal to the second preset time preset in the control unit, limiting the working state of the engine according to a second preset relation preset in the control unit;
and when the engine oil pressure value is greater than a third pressure threshold value, timing the holding time of the engine oil pressure value by a timing unit, continuously acquiring the engine oil pressure value in real time if the holding time of the engine oil pressure value is less than a third preset time preset in the control unit, and limiting the engine speed and torque output according to a third preset relation preset in the control unit if the holding time of the engine oil pressure value is greater than or equal to the third preset time preset in the control unit.
2. The engine oil pressure control method according to claim 1, characterized in that: the engine oil temperature signal acquisition unit acquires the temperature of the engine oil in real time, if the temperature of the engine oil is less than or equal to a preset engine oil temperature threshold value, the temperature of the engine oil is continuously acquired in real time, and if the temperature of the engine oil is greater than the preset engine oil temperature threshold value, the working state of the engine is limited according to a second preset relation.
3. The engine oil pressure control method according to claim 1 or 2, characterized in that: the control unit limits the working state of the engine according to a first preset relation, and particularly stops the engine by controlling the fuel injection quantity and the target rotating speed of the engine so as to achieve the purpose of actively protecting the engine;
the control unit limits the working state of the engine according to a second preset relation, and specifically limits the engine to run at an idle speed by controlling the fuel injection quantity and the target rotating speed of the engine so as to achieve the purpose of actively protecting the engine;
the control unit limits the working state of the engine according to a third preset relation, specifically, limits the torque of the engine to be 50% output by controlling the fuel injection quantity and the target rotating speed of the engine, and limits the rotating speed to be 500rpm lower than the current rotating speed of the engine; when the target rotating speed is lower than the idle rotating speed, setting the target rotating speed as the idle rotating speed; the purpose of actively protecting the engine is achieved; the current rotating speed of the engine is acquired through an engine rotating speed signal acquisition unit.
4. A method of controlling engine oil pressure according to claim 3, characterized in that: when the control unit controls the working state of the engine according to the first preset relation, the buzzer alarms, and the engine oil alarm lamp is normally on; when the control unit controls the working state of the engine according to a second preset relation, the buzzer alarms, and the engine oil alarm lamp flashes; when the control unit limits the rotating speed and the torque output of the engine according to a third preset relation, the buzzer alarms, and the engine oil alarm lamp flashes.
5. An engine protection device that implements the engine oil pressure control method of claim 1, characterized in that: the system comprises an information acquisition unit, a timing unit and a control unit, wherein the information acquisition unit comprises an engine oil pressure signal acquisition unit, the engine oil pressure signal acquisition unit acquires the engine oil pressure in real time, and the timing unit starts timing and provides timing duration for the control unit when the control unit judges that the engine oil pressure is abnormal; the method specifically comprises the following steps: when the control unit judges that the engine oil pressure is extremely low (the engine oil pressure value is smaller than a first pressure threshold value), timing t1 is started and the timing duration is provided for the control unit; when the control unit schedules that the engine oil pressure is lower (the oil pressure value is greater than or equal to the first pressure threshold and less than the second pressure threshold), starting timing t2 and providing the timing duration to the control unit; when the control unit judges that the engine oil pressure is too high (the engine oil pressure value is larger than a third pressure threshold value), timing t3 is started and the timing duration is provided for the control unit;
the control unit controls the power output of the engine according to different preset relations according to the engine oil pressure information of the engine so as to achieve the purpose of actively protecting the engine; the method specifically comprises the following steps: limiting the torque output of the engine by controlling the fuel injection quantity of the engine; the actual operating speed of the engine is limited by controlling the target engine speed.
6. The engine protection device of claim 5, wherein: the information acquisition unit also comprises an engine oil temperature signal acquisition unit; the engine oil temperature signal acquisition unit can acquire engine oil temperature information in real time and provide the information for the control unit to judge.
7. The engine protection device of claim 5, wherein: the information acquisition unit also comprises an engine rotating speed signal acquisition unit; the engine rotating speed signal acquisition unit can acquire the rotating speed information of the engine in real time and provide the information to the control unit for judgment.
8. The engine protection device of claim 5, wherein: the device also comprises an alarm unit; the alarm unit comprises a buzzer and an engine oil pressure lamp.
9. The engine protection device of claim 8, wherein: the alarm unit can remind the abnormal state of the engine through sound and light modes and can distinguish the abnormal state of the engine according to the difference of sound and light.
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