CN114658512B - Detection method and device - Google Patents

Abstract

The application discloses a detection method, which comprises the following steps: measuring a first oil pressure when the engine is in an idle state; measuring a second oil pressure when the rotational speed of the engine reaches a target rotational speed, in a case where the first oil pressure satisfies a set condition; determining the working state of an engine oil pump of the engine according to the first engine oil pressure; and under the condition that the working state of the engine oil pump is a normal state, determining the working state of an engine oil pump relief valve of the engine according to the second engine oil pressure. In addition, the application also discloses a detection device.

Description

Detection method and device

Technical Field

The present application relates to the field of detection, and relates to, but is not limited to, a detection method and apparatus.

Background

In the related art, the engine oil pressure of the main oil duct of the engine is monitored through an engine oil pressure switch, and when the engine oil pressure of the main oil duct of the engine is lower than a set alarm value, the engine alarms. When the engine oil pressure of the main oil duct of the engine is monitored through the engine oil pressure switch and an alarm is given, the engine oil pump usually gives an alarm after a problem occurs, and the engine oil pump gives an alarm after the problem occurs, so that the problem cannot be found timely at the initial stage of the problem, and the problem of the fault cannot be predicted and processed in advance.

Disclosure of Invention

The embodiment of the application provides an information processing method and device for solving at least one problem in the related art, which can timely discover the problem at the early stage of the problem occurrence and predict and process faults in advance.

The technical scheme of the application is realized as follows:

in a first aspect, embodiments of the present application provide a detection method, where the method includes:

measuring a first oil pressure when the engine is in an idle state;

measuring a second oil pressure when the rotational speed of the engine reaches a target rotational speed, in a case where the first oil pressure satisfies a set condition;

determining the working state of an engine oil pump of the engine according to the first engine oil pressure;

and under the condition that the working state of the engine oil pump is a normal state, determining the working state of an engine oil pump relief valve of the engine according to the second engine oil pressure.

In a second aspect, embodiments of the present application provide a detection apparatus, the apparatus including:

a first measurement unit for measuring a first oil pressure when the engine is in an idle state;

a second measurement unit configured to measure a second oil pressure when a rotation speed of the engine reaches a target rotation speed, in a case where the first oil pressure satisfies a set condition;

A first determining unit configured to determine an operating state of an oil pump of the engine according to the first oil pressure;

and the second determining unit is used for determining the working state of an oil pump relief valve of the engine according to the second oil pressure under the condition that the working state of the oil pump is in a normal state.

The application provides a detection method and a detection device, wherein a first engine oil pressure is measured when an engine is in an idle state, a second engine oil pressure is measured when the rotating speed of the engine reaches a target rotating speed under the condition that the first engine oil pressure meets a set condition, the working state of an engine oil pump of the engine is determined according to the first engine oil pressure, and the working state of an engine oil pump relief valve of the engine is determined according to the second engine oil pressure under the condition that the working state of the engine oil pump is in a normal state. In this way, when the engine is in an idle state and the rotating speed of the engine reaches a target rotating speed, the first engine oil pressure and the second engine oil pressure are obtained, the working state of the engine oil pump is determined according to the first engine oil pressure, and the working state of the engine oil pump pressure relief valve is determined according to the second engine oil pressure, so that the working states of the engine oil pump and the engine oil pump pressure relief valve can be determined according to the engine oil pressures obtained by measuring the two states of the engine, and thus, problems can be found in time at the initial stage of the occurrence of the problems, and the problems of faults can be predicted and processed in advance.

Drawings

FIG. 1 is a schematic diagram of an alternative structure of a detection system according to an embodiment of the present disclosure;

FIG. 2 is a schematic flow chart of an alternative detection method according to an embodiment of the present disclosure;

FIG. 3 is a schematic flow chart of an alternative detection method according to an embodiment of the present disclosure;

FIG. 4 is a schematic flow chart of an alternative detection method according to an embodiment of the present disclosure;

FIG. 5 is a schematic flow chart of an alternative detection method according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of an alternative structure of a detection device according to an embodiment of the present disclosure;

fig. 7 is an alternative structural schematic diagram of an electronic device according to an embodiment of the present application.

Detailed Description

For the purposes, technical solutions and advantages of the embodiments of the present application to be more apparent, the specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are illustrative of the present application, but are not intended to limit the scope of the present application.

Embodiments of the present application may provide a detection method and apparatus, a device (e.g., an electronic device), and a storage medium (e.g., a computer-readable storage medium).

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In the following description, the term "first\second\third" is merely used for example to distinguish different objects, and does not represent a specific ordering for the objects, and does not have a limitation of precedence order. It will be appreciated that the "first-/second-/third-" may be interchanged with one another in the specific order or sequence of parts where appropriate to enable the embodiments of the present application described herein to be implemented in other than those illustrated or described herein.

In the following description, reference is made to "some embodiments" which describe a subset of all possible embodiments, but it is to be understood that "some embodiments" can be the same subset or different subsets of all possible embodiments and can be combined with one another without conflict.

The detection method of the embodiment of the present application may be applied to the detection system 100, where the detection system 100 includes: and a detection device 110, wherein the detection device 110 can measure a first oil pressure when the engine is in an idle state, and when the first oil pressure meets a set condition, measure a second oil pressure when the rotating speed of the engine reaches a target rotating speed, determine an operating state of an oil pump of the engine according to the first oil pressure, and determine an operating state of an oil pump relief valve of the engine according to the second oil pressure when the operating state of the oil pump is in a normal state.

In this embodiment, the detection apparatus may be used to detect an operating state of a lubrication system in an engine, where the lubrication system may include: the detection equipment can determine the working state of the oil pump and the working state of the oil pump relief valve under the condition that the lubrication system comprises the oil pump and the oil pump relief valve, and determine the working state of the lubrication system according to the determined working state of the oil pump and the determined working state of the oil pump relief valve.

Fig. 2 is a schematic implementation flow chart of a detection method according to an embodiment of the present application, where the method may include the following steps:

s201, the detection device measures first engine oil pressure when the engine is in an idle state.

Here, the idle state is a state in which the engine is operated under no load, and the idle range is generally 700 to 800 revolutions per minute.

For an engine that includes a main oil gallery, the detection device will measure a first oil pressure in the main oil gallery in the engine when the engine is in an idle state.

In an embodiment of the present application, before the detecting device measures the first oil pressure when the engine is in the idle state, the method further includes: and starting the engine, measuring the engine oil temperature and the environment temperature of the engine, and if the difference value between the engine oil temperature and the environment temperature is smaller than or equal to a set threshold value, determining that the engine is started by a cold engine. After determining that the engine is cold, the detection device will measure a first oil pressure when the engine is in an idle state. The specific value of the threshold is not limited in this embodiment. Such as: the threshold is set to 2.

In one example, the threshold value is set to 2, and after the engine is started, if the engine oil temperature measured by the detection device is 23 degrees celsius (°c), the measured ambient temperature is 25 ℃, and the difference between the oil temperature 23 ℃ and the ambient temperature 25 ℃ is 2 ℃ equal to the set threshold value of 2, the engine is determined to be cold-started.

For the ambient temperature, the ambient temperature range of most regions nationwide can be set to three temperature ranges of-30 degrees celsius (°c) to-20 ℃, -20 ℃ to 0 ℃ and 0 ℃ to 45 ℃.

For the engine oil temperature, the engine oil viscosity will be different due to different engine oil temperatures, and the engine oil pressure will be different due to different engine oil viscosities, so that the engine oil pressures corresponding to different engine oil temperatures are different, and the engine oil pressure ranges corresponding to different engine oil temperature ranges are different.

Here, the user may set an oil pressure range corresponding to the oil temperature range, and after the user sets the oil pressure range corresponding to the oil temperature range, the detection apparatus may store the set oil pressure range corresponding to the oil temperature range in the electronic control unit (Electronic Control Unit, ECU) for subsequent use.

The embodiment of the present application does not limit this in any way for different oil pressure ranges corresponding to different oil temperature ranges.

In one example, the oil temperature range is 45 ℃ to 50 ℃, which corresponds to an oil pressure range of 600 kilopascals (kPa) to 650kPa.

S202, when the first engine oil pressure meets a set condition, the detection device measures a second engine oil pressure when the rotating speed of the engine reaches a target rotating speed.

Here, the setting conditions include: the first oil pressure is within a first oil pressure range corresponding to the first oil temperature. The first engine oil temperature is the engine oil temperature measured by the detection system when the engine is in an idle state.

The target rotational speed is a rotational speed that is greater than the rotational speed at which the engine is in an idle state, and the specific value of the target rotational speed is not limited in this embodiment of the present application. Such as: the target rotation speed was 3000 revolutions per minute (rpm).

In an embodiment of the present application, before the detecting device measures the first oil pressure when the engine is in the idle state, the method further includes: the detection device measures a first oil temperature when the engine is in an idle state. After measuring the first oil temperature, the detection system will determine a first oil temperature range to which the first oil temperature belongs according to the first oil temperature, after determining the first oil temperature range, the detection device will determine a first oil pressure range corresponding to the first oil temperature range, determine whether the first oil pressure is within the first oil pressure range corresponding to the oil temperature range, if the first oil pressure is within the first oil pressure range, then determine that the first oil pressure meets a set condition, and the detection device will measure a second oil pressure when the rotation speed of the engine reaches a target rotation speed.

Here, the detection device may determine, in the ECU storing the oil pressure range corresponding to the oil temperature range, the first oil pressure range corresponding to the first oil temperature range, based on the first oil temperature range, after determining the first oil temperature range to which the first oil temperature belongs.

In one example, the first oil temperature range includes: the first oil temperature range is 45 ℃ to 50 ℃ and the corresponding oil pressure range is 600kPa to 650kPa. If the first oil temperature is 50 ℃, and the first oil temperature range to which the first oil temperature 50 ℃ belongs is 45 ℃ to 50 ℃, the detection equipment determines that the first oil pressure range corresponding to the first oil temperature range 45 ℃ to 50 ℃ is 600kPa to 650kPa according to the first oil temperature range 45 ℃ to 50 ℃ in the ECU.

S203, the detection equipment determines the working state of an engine oil pump of the engine according to the first engine oil pressure.

Here, after measuring the first oil pressure, the detecting device will determine an operation state of the oil pump of the engine based on the first oil pressure, which may include: normal and abnormal states. The normal state is used for representing that the oil pump can work normally, namely, the oil pump can suck oil from the oil pan and pump the sucked oil to various oil parts of the engine. The abnormal state is used for indicating that the oil pump cannot work normally, i.e., the oil pump cannot suck the oil from the oil pan and pump the sucked oil to various oil parts of the engine.

For the oil pump of the engine, the oil pump of the engine may be a fixed displacement oil pump or a variable displacement oil pump, which is not limited in any way in the embodiment of the present application.

In the case that the oil pump of the engine is a fixed displacement oil pump, the flow rate of the oil pumped by the fixed displacement oil pump is in direct proportion to the rotation speed of the oil pump. Under the condition that the engine oil pump of the engine is a variable displacement engine oil pump, the flow rate of engine oil pumped by the variable displacement engine oil pump can be adjusted, and the pressure of engine oil in a main oil duct of the engine can be adjusted by adjusting the flow rate of engine oil pumped by the engine oil pump, so that the pressure of engine oil in the main oil duct of the engine can meet the requirement.

And S204, under the condition that the working state of the engine oil pump is a normal state, the detection equipment determines the working state of an engine oil pump relief valve of the engine according to the second engine oil pressure.

Here, after measuring the second oil pressure, the detecting device will determine an operation state of an oil pump relief valve of the engine according to the second oil pressure, which may include: normal and abnormal states. The normal state is used for representing that the oil pump pressure relief valve can work normally, namely, when the oil flow is excessive, the oil pump pressure relief valve can be opened to discharge the excessive oil flow, so that the oil pressure is ensured to be at a reasonable level. The abnormal state is used for representing that the oil pump pressure relief valve cannot work normally, namely, when the oil flow is excessive, the oil pump pressure relief valve cannot be opened.

In the embodiment of the application, the flow of the engine oil pumped by the engine oil pump is in direct proportion to the rotating speed of the engine oil pump, and the rotating speed of the engine oil pump is in direct proportion to the rotating speed of the engine. When the engine is in an idle state, the rotation speed of the engine is low, so that the rotation speed of the oil pump is low, the oil flow pumped by the oil pump is low, and at the moment, the pressure relief valve of the oil pump can not be opened because the pumped oil flow is low. When the rotation speed of the engine reaches a higher target rotation speed, the rotation speed of the engine is higher, so that the rotation speed of the oil pump is higher, the oil flow pumped by the oil pump is more, and at the moment, a pressure relief valve of the oil pump can be opened to purge the redundant oil flow.

Under the condition that a pressure relief valve of the engine oil pump is not opened, the detection equipment can determine the working state of the engine oil pump of the engine according to the measured first engine oil pressure when the engine is in an idle state, and under the condition that the working state of the engine oil pump is determined to be in a normal state, the rotating speed of the engine is increased to a target rotating speed, after the rotating speed of the engine is increased to the target rotating speed, the pressure relief valve of the engine oil pump is opened, and the working state of the pressure relief valve of the engine oil pump of the engine is determined according to the measured second engine oil pressure when the rotating speed of the engine reaches the target rotating speed.

The embodiment of the application provides a detection method, which is used for measuring a first engine oil pressure when an engine is in an idle state, measuring a second engine oil pressure when the rotating speed of the engine reaches a target rotating speed under the condition that the first engine oil pressure meets a set condition, determining the working state of an engine oil pump of the engine according to the first engine oil pressure, and determining the working state of an engine oil pump relief valve of the engine according to the second engine oil pressure under the condition that the working state of the engine oil pump is in a normal state. In this way, when the engine is in an idle state and the rotating speed of the engine reaches a target rotating speed, the first engine oil pressure and the second engine oil pressure are obtained, the working state of the engine oil pump is determined according to the first engine oil pressure, and the working state of the engine oil pump pressure relief valve is determined according to the second engine oil pressure, so that the working states of the engine oil pump and the engine oil pump pressure relief valve can be determined according to the engine oil pressures obtained by measuring the two states of the engine, and thus, problems can be found in time at the initial stage of the occurrence of the problems, and the problems of faults can be predicted and processed in advance.

In some embodiments, in the case where the engine oil pump is a variable displacement oil pump, the displacement of the variable displacement oil pump includes: a first displacement and a second displacement, the first displacement being greater than the second displacement; correspondingly, the measuring the first oil pressure when the engine is in the idle state includes: measuring the oil pressure corresponding to the first displacement when the engine is in the idle state; and measuring the oil pressure corresponding to the second displacement when the engine is in the idle state.

Here, the first displacement is used to indicate a maximum displacement of the variable displacement oil pump, and the second displacement is used to indicate a minimum displacement of the variable displacement oil pump.

Under the condition that the engine is in an idle state and the oil pump is a variable displacement oil pump, the detection equipment measures the oil pressure of a main oil duct corresponding to the first displacement in the engine, measures the oil pressure of a main oil duct corresponding to the second displacement in the engine, and determines the working state of the oil pump of the engine according to the oil pressure of the main oil duct corresponding to the first displacement and the oil pressure of the main oil duct corresponding to the second displacement.

In some embodiments, prior to measuring the second oil pressure at which the rotational speed of the engine reaches the target rotational speed, the method further comprises: judging whether the first engine oil pressure is in a first engine oil pressure range corresponding to the first engine oil temperature, and if the first engine oil pressure is in the first engine oil pressure range, determining that the first engine oil pressure meets the set condition.

In one example, if the first oil temperature is 50 ℃, and the first oil temperature corresponds to a first oil pressure range of 600kPa to 650kPa and the first oil pressure is 620kPa, the first oil pressure 620kPa is within the first oil pressure range of 600kPa to 650kPa, and it is determined that the first oil pressure satisfies the set condition.

In some embodiments, before the determining the operating state of the oil pump of the engine according to the first oil pressure, the method further includes: and measuring a first engine oil temperature when the engine is in the idle state, and determining a first engine oil pressure range corresponding to the first engine oil temperature.

Here, before determining the operating state of the oil pump of the engine, the detecting device may measure a first oil temperature when the engine is in an idle state, and determine a first oil temperature range to which the first oil temperature belongs, and after determining the first oil temperature range, the detecting device may determine, in the ECU, a first oil pressure range corresponding to the first oil temperature range, based on the determined first oil temperature range.

In this embodiment of the present application, in a case where the oil pump of the engine is a fixed displacement oil pump, or in a case where the oil pump of the engine is a variable displacement oil pump, the step of determining the working state of the oil pump of the engine by the detection device is different. The case where the oil pump of the engine is a fixed displacement oil pump will be discussed in detail below.

In some embodiments, in a case where the oil pump of the engine is a fixed displacement oil pump, the determining, according to the first oil pressure, an operating state of the oil pump of the engine includes: the detection device judges whether the first engine oil pressure is in the first engine oil pressure range, and if the first engine oil pressure is in the first engine oil pressure range, the working state of an engine oil pump of the engine is determined to be a normal state.

After the first oil temperature and the first oil pressure are measured, the detecting device can determine a first oil pressure range corresponding to the first oil temperature according to the first oil temperature, judge whether the first oil pressure is in the first oil pressure range, and if the first oil pressure is in the first oil pressure range, the detecting device can determine that the working state of the oil pump of the engine is a normal state.

In one example, if the first oil temperature is 50 ℃, and the first oil pressure range corresponding to the first oil temperature 50 ℃ is 600kPa to 650kPa, and the first oil pressure is 630kPa, the detection device determines that the first oil pressure 630kPa is within the first oil pressure range of 600kPa to 650kPa, and at this time, the detection device determines that the operating state of the oil pump of the engine is a normal state.

In this embodiment of the present application, after measuring the first oil temperature and the first oil pressure, the detecting device may determine, according to the first oil temperature, a first oil pressure range corresponding to the first oil temperature, and determine whether the first oil pressure is located in the first oil pressure range, and if the first oil pressure is not located in the first oil pressure range, the detecting device may determine that an operating state of an oil pump of an engine is an abnormal state.

In one example, if the first oil temperature is 50 ℃, and the first oil pressure range corresponding to the first oil temperature 50 ℃ is 600kPa to 650kPa, and the first oil pressure is 700kPa, the detection device will determine that the first oil pressure 700kPa is not within the first oil pressure range of 600kPa to 650kPa, and at this time, the detection device will determine that the operating state of the oil pump of the engine is abnormal.

The case where the oil pump of the engine is a variable displacement oil pump will be discussed in detail below.

In some embodiments, in the case where the engine oil pump is a variable displacement oil pump, the displacement of the variable displacement oil pump includes: a first displacement and a second displacement, the first displacement being greater than the second displacement, the first oil pressure comprising: the engine oil pressure corresponding to the first displacement and the engine oil pressure corresponding to the second displacement, the determining the working state of the engine oil pump of the engine according to the first engine oil pressure includes: judging whether the oil pressure corresponding to the first displacement is in the first oil pressure range or not, judging whether the oil pressure corresponding to the second displacement is in the first oil pressure range or not, and if the oil pressure corresponding to the first displacement and the oil pressure corresponding to the second displacement are in the first oil pressure range, determining that the working state of an oil pump of the engine is a normal state.

Here, after the detection device measures the first oil temperature, the oil pressure corresponding to the first displacement, and the oil pressure corresponding to the second displacement, the detection device may determine, according to the first oil temperature, a first oil pressure range corresponding to the first oil temperature, and determine whether the oil pressure corresponding to the first displacement and the oil pressure corresponding to the second displacement are located in the first oil pressure range, and if the oil pressure corresponding to the first displacement and the oil pressure corresponding to the second displacement are located in the first oil pressure range, the detection device may determine that the working state of the oil pump of the engine is a normal state.

In an example, if the first oil temperature is 50 ℃, the first oil pressure range corresponding to the first oil temperature of 50 ℃ is 600kPa to 650kPa, the oil pressure corresponding to the first displacement is 610kPa, and the oil pressure corresponding to the second displacement is 620kPa, the detection device determines that the oil pressure corresponding to the first displacement 610kPa and the oil pressure corresponding to the second displacement 620kPa are located within the first oil pressure range of 600kPa to 650kPa, and at this time, the detection device determines that the operating state of the oil pump of the engine is a normal state.

In this embodiment, after measuring the first oil temperature, the oil pressure corresponding to the first displacement, and the oil pressure corresponding to the second displacement, the detection device may determine, according to the first oil temperature, a first oil pressure range corresponding to the first oil temperature, and determine whether the oil pressure corresponding to the first displacement and the oil pressure corresponding to the second displacement are located in the first oil pressure range, if the oil pressure corresponding to the first displacement is located in the first oil pressure range, the oil pressure corresponding to the second displacement is not located in the first oil pressure range, then the detection device may determine that the working state of the variable displacement oil pump is a normal state when the variable displacement oil pump is in the first displacement, and the working state of the variable displacement oil pump is an abnormal state when the variable displacement oil pump is in the second displacement. Similarly, if the oil pressure corresponding to the first displacement is not within the first oil pressure range, and the oil pressure corresponding to the second displacement is within the first oil pressure range, the detection device may determine that the working state of the variable displacement oil pump is an abnormal state when the variable displacement oil pump is at the first displacement, and that the working state of the variable displacement oil pump is a normal state when the variable displacement oil pump is at the second displacement.

In an example, if the first oil temperature is 50 ℃, the first oil pressure range corresponding to the first oil temperature of 50 ℃ is 600kPa to 650kPa, the oil pressure corresponding to the first displacement is 620kPa, the oil pressure corresponding to the second displacement is 700kPa, the detection device will determine that the oil pressure corresponding to the first displacement is 620kPa within the first oil pressure range of 600kPa to 650kPa, the oil pressure corresponding to the second displacement is 700kPa not within the first oil pressure range of 600kPa to 650kPa, at this time, the detection device will determine that the working state of the variable displacement oil pump is a normal state when the variable displacement oil pump is at the first displacement, and the working state of the variable displacement oil pump is an abnormal state when the variable displacement oil pump is at the second displacement.

In another example, if the first oil temperature is 50 ℃, the first oil pressure range corresponding to the first oil temperature of 50 ℃ is 600kPa to 650kPa, the oil pressure corresponding to the first displacement is 700kPa, the oil pressure corresponding to the second displacement is 620kPa, the detection device will determine that the oil pressure corresponding to the first displacement is 700kPa and not located within the first oil pressure range of 600kPa to 650kPa, the oil pressure corresponding to the second displacement is 620kPa and located within the first oil pressure range of 600kPa to 650kPa, at this time, the detection device will determine that the operating state of the variable displacement oil pump is an abnormal state when the variable displacement oil pump is at the first displacement, and the operating state of the variable displacement oil pump is a normal state when the variable displacement oil pump is at the second displacement.

In some embodiments, before the determining the operating state of the engine oil pump relief valve according to the second oil pressure, the method further includes: the detection equipment measures a second engine oil temperature when the rotating speed of the engine reaches the target rotating speed, and determines a second engine oil pressure range corresponding to the second engine oil temperature.

Here, before determining the operating state of the oil pump relief valve of the engine, the detection apparatus may measure a second oil temperature at which the rotational speed of the engine reaches the target rotational speed, and determine a second oil temperature range to which the second oil temperature belongs, and after determining the second oil temperature range, the detection apparatus may determine, in the ECU, a second oil pressure range corresponding to the second oil temperature range according to the determined second oil temperature range.

In this embodiment of the present application, when the oil pump of the engine is a fixed displacement oil pump, or when the oil pump of the engine is a variable displacement oil pump, the step of determining the working state of the oil pump relief valve of the engine by the detection device is different. The case where the oil pump of the engine is a fixed displacement oil pump will be discussed in detail below.

In some embodiments, in a case where the oil pump of the engine is a fixed displacement oil pump, the determining, according to the second oil pressure, the working state of an oil pump relief valve of the engine includes: and the detection equipment judges whether the second engine oil pressure is in the second engine oil pressure range, and if the second engine oil pressure is in the second engine oil pressure range, the working state of an engine oil pump relief valve of the engine is determined to be a normal state.

After the second oil temperature and the second oil pressure are measured, the detecting device can determine a second oil pressure range corresponding to the second oil temperature according to the second oil temperature, judge whether the second oil pressure is in the second oil pressure range, and if the second oil pressure is in the second oil pressure range, the detecting device can determine that the working state of the oil pump relief valve of the engine is a normal state.

In this embodiment of the present application, after the second oil temperature and the second oil pressure are measured by the detection device, the second oil pressure range corresponding to the second oil temperature may be determined according to the second oil temperature, and whether the second oil pressure is located in the second oil pressure range may be determined, and if the second oil pressure is not located in the second oil pressure range, the detection device may determine that the working state of the oil pump relief valve of the engine is an abnormal state.

The case where the oil pump of the engine is a variable displacement oil pump will be discussed in detail below.

In some embodiments, in the case where the engine oil pump is a variable displacement oil pump, the displacement of the variable displacement oil pump includes: the first displacement, the second oil pressure includes: and determining the working state of an oil pump relief valve of the engine according to the second oil pressure, wherein the working state of the oil pump relief valve of the engine comprises the following steps: the detection equipment judges whether the oil pressure corresponding to the first displacement is in the second oil pressure range, and if the oil pressure corresponding to the first displacement is in the second oil pressure range, the detection equipment determines that the working state of an oil pump relief valve of the engine is a normal state.

Here, after the detection device measures the second oil temperature and the oil pressure corresponding to the first displacement, the detection device may determine a second oil pressure range corresponding to the second oil temperature according to the second oil temperature, determine whether the oil pressure corresponding to the first displacement is within the second oil pressure range, and if the oil pressure corresponding to the first displacement is within the first oil pressure range, determine that the working state of the oil pump relief valve of the engine is a normal state.

In this embodiment of the present application, after measuring the second oil temperature and the oil pressure corresponding to the first displacement, the detecting device may determine, according to the second oil temperature, a second oil pressure range corresponding to the first oil temperature, and determine whether the oil pressure corresponding to the first displacement is located in the second oil pressure range, and if the oil pressure corresponding to the first displacement is not located in the first oil pressure range, the detecting device may determine that the working state of the oil pump relief valve of the engine is an abnormal state.

The engine lubrication system includes: an oil pump and an oil passage. The engine oil with certain pressure and flow is sucked from the oil pan through the engine oil pump and pumped to each oil-using part of the engine to lubricate and cool each oil-using part. The engine oil pressure and flow of each oil-using part are required to meet the limit value requirements so as to ensure the performance and reliability of the engine.

In the related art, an engine adopts an engine oil pressure or an engine oil pressure sensor to monitor the engine oil pressure of an engine main oil duct, the engine oil pressure of the engine main oil duct is measured under different working conditions of the engine, and if the measured oil pressure is lower than an alarm limit, an engine oil lamp on an instrument panel is lightened to alarm.

The engine oil pressure of the main oil duct of the engine is detected by the engine oil pressure or the engine oil pressure sensor to judge whether the engine lubricating system is faulty or not, and the engine working condition is not actively controlled, the displacement of the engine oil pump is not actively controlled, and the engine oil pressure in all engine oil temperature ranges is required to be actively covered, so that the engine oil pressure alarm value of the engine is very low, and the set engine oil pressure alarm value is required to cover the lowest oil pressure of all working conditions so as to avoid frequent alarm of the engine. When the oil pressure has been alerted, the oil pressure has been very low, which can lead to serious damage to the engine if the engine is re-operated. Typically, the lubrication system has a problem and can not continue running any more to give an alarm. This will result in failure to find the problem at the beginning of the problem and take corresponding measures to avoid the problem being exacerbated to a state where it cannot be driven.

In addition, in the case of the variable displacement oil pump adopted by the engine, when the engine oil flow requirement becomes large due to faults such as leakage of the lubricating system, the oil pump displacement can be adjusted to temporarily meet the engine main oil passage oil pressure, the main oil passage oil pressure is reduced only when the leakage amount of the lubricating system is too large, the oil pump displacement cannot be compensated, and the oil pressure is triggered to alarm only when the oil pressure is reduced below an alarm limit value, so that a driver finds out that the fault time is late, and usually the fault cannot be predicted and handled in advance after the fault is seriously damaged.

The embodiment of the application provides a detection method, after an engine is started, the engine is controlled to run under different working conditions, the engine oil pressure and the engine oil temperature of a main oil duct of the engine are measured, whether the measured engine oil pressure is in a normal range is compared, and if a lubricating system passes self-checking, the performance of an engine oil pump and the function of a pressure release valve of the engine oil pump are indicated to be normal; if the self-check of the lubrication system is failed, the engine oil pressure is indicated to be not alarmed, at the moment, the engine is limited, the speed of the vehicle is limited, and a driver is reminded of paying attention to the failure of the lubrication system and needing to go to a repair shop for maintenance and detection; if the engine oil pressure alarms, the driver is informed that the vehicle does not need to be moved, and the vehicle is stopped for rescue.

Here, the lubrication system is the detection system described in the above embodiment.

The detection method provided by the application can be suitable for the configuration conditions of different oil pumps, one is a fixed-displacement oil pump, the other is a variable-displacement oil pump, and the fixed-displacement oil pump and the variable-displacement oil pump are respectively described in detail below.

In the case of an engine using a fixed displacement oil pump, the flow rate of oil pumped by the oil pump is proportional to the rotational speed of the oil pump because the oil pump is of a fixed displacement. When the engine is at a high rotating speed, the oil pumped by the oil pump is excessive, and at the moment, the excessive oil flow is discharged through the oil pump pressure relief valve, so that the oil pressure of the engine lubricating system is ensured to be in a reasonable state.

Aiming at the situation, whether the oil pump function, the oil pump pressure relief valve function and the lubricating system oil way are faulty or not can be detected through the detection method provided by the application.

The detection method provided by the application will be described in detail below with reference to a flowchart shown in fig. 3, for the case where the engine employs a fixed displacement oil pump.

S301, starting the engine, and measuring the engine oil temperature and the ambient temperature.

Here, as for the oil temperature, since the oil viscosity differs at different oil temperatures, the oil viscosity differs to cause the oil pressure of the engine main gallery to differ, and a different oil pressure range may be set according to a different oil temperature range and stored in the ECU.

As for the ambient temperature, depending on the ambient temperature of most regions nationwide, the ambient temperature ranges of three temperature ranges of-30 degrees celsius (°c) to-20 ℃, -20 ℃ to 0 ℃ and 0 ℃ to 45 ℃ can be set.

For the above three temperature intervals, the normal oil pressure range of the engine main oil gallery is determined and recorded in the ECU with the rotational speed of the engine at idle and 3000 rotational speeds (rpm).

S302, judging whether the temperature difference between the engine oil temperature and the ambient temperature is within a limit value range.

Here, the limit value range is the set threshold value described in the above embodiment.

If the temperature difference between the engine oil temperature and the ambient temperature is within the limit value range, S303 is executed: judging that the engine is started by a cold engine, and starting the self-checking function of the engine lubricating system.

Here, if the temperature difference between the engine oil temperature and the ambient temperature is not within the limit value, S301 is re-executed at the next cold start.

S304, controlling the engine to be in an idle state, and measuring the engine oil temperature T1 and the engine main oil pressure P1.

Here, the oil temperature T1 is the first oil temperature described in the above embodiment, and the oil pressure P1 is the first oil pressure described in the above embodiment.

When the engine is in an idle state, a pressure relief valve of the oil pump is not opened.

S305, inquiring the normal pressure range stored by the ECU according to the engine oil temperature T1.

S306, judging whether the main oil gallery pressure P1 is in a normal pressure range.

If the main oil gallery pressure P1 is in the normal pressure range, S307 is executed: the engine speed was increased to 3000rpm and the oil temperature T2 and the engine main oil pressure P2 were recorded.

Here, if the main oil gallery pressure P1 is not in the normal pressure range, S308 is performed: a lubrication system fault is determined.

The oil temperature T2 is the second oil temperature described in the above embodiment, and the oil pressure P2 is the second oil pressure described in the above embodiment.

At this time, since the engine oil viscosity is high when the engine is started, the engine oil pressure is high, and the oil pump relief valve is opened.

S309, inquiring the normal pressure range stored by the ECU according to the engine oil temperature T2.

And S310, judging whether the main oil gallery oil pressure P2 is in a normal pressure range.

If the main oil pressure P2 is in the normal range, S311 is executed: and determining the self-checking passing of the lubrication system.

Here, if the main oil pressure P2 is not in the normal range, the above-described S308 is performed: a lubrication system fault is determined.

If P1 or P2 exceeds the normal oil pressure range, the self-test is not passed, the driver is notified of the lubrication system failure, and it is possible to determine which portion of the lubrication system fails. For example, if P1 is in the normal range, the oil pump performance is normal and the engine lubrication system oil circuit is normal; if P2 is in the normal range, the oil pump relief valve functions normally.

When the engine adopts the variable displacement oil pump, the oil pump displacement is adjustable, so that the oil pump can adjust the engine main oil pressure by adjusting the oil pump displacement in a certain range, so that the oil pressure of the engine main oil passage meets the requirement.

According to the detection method, whether the maximum displacement and the minimum displacement of the variable displacement oil pump meet requirements or not can be detected, whether the displacement adjusting function of the oil pump is normal or not is detected, whether the pressure relief valve of the oil pump is normal or not is detected, and whether the oil way of the engine lubricating system is normal or not is detected.

The detection method provided in the present application will be described in detail below with reference to a flowchart shown in fig. 4, for the case where the engine employs a variable displacement oil pump.

S401, starting the engine, and measuring the engine oil temperature and the ambient temperature.

Here, as for the oil temperature, since the oil viscosity differs at different oil temperatures, the oil viscosity differs to cause the oil pressure of the engine main gallery to differ, and a different oil pressure range may be set according to a different oil temperature range and stored in the ECU.

As for the ambient temperature, depending on the ambient temperature of most regions nationwide, the ambient temperature ranges of three temperature ranges of-30 degrees celsius (°c) to-20 ℃, -20 ℃ to 0 ℃ and 0 ℃ to 45 ℃ can be set.

For the above three temperature intervals, the normal oil pressure ranges of the engine main oil gallery at maximum displacement and minimum displacement of the oil pump were determined and recorded in the ECU, respectively, with the rotational speed of the engine at idle and 3000 rpm.

S402, judging whether the temperature difference between the engine oil temperature and the ambient temperature is within a limit value range.

And S403, if the temperature difference between the engine oil temperature and the ambient temperature is within the limit value range, judging that the engine is started by a cold engine, and starting the self-checking function of the engine lubricating system.

Here, if the temperature difference between the engine oil temperature and the ambient temperature is not within the limit value, S401 is re-executed at the next cold start.

S404, controlling the engine to be in an idle state, measuring the engine oil temperature T1, measuring the engine main oil pressure P11 when the oil pump is at the maximum displacement, and measuring the engine main oil pressure P12 when the oil pump is at the minimum displacement.

Here, when the oil pump is at the maximum displacement, the engine main oil pressure P11 is the oil pressure corresponding to the first displacement described in the above embodiment, and when the oil pump is at the minimum displacement, the engine main oil pressure P12 is the oil pressure corresponding to the second displacement described in the above embodiment.

When the engine is in an idle state, a pressure relief valve of the oil pump is not opened.

S405, inquiring the normal pressure range stored by the ECU according to the engine oil temperature T1.

S406, judging whether the main oil pressure P11 and the main oil pressure P12 are in a normal range.

If the main oil pressure P11 and the main oil pressure P12 are in the normal range, S407 is performed: the engine speed was increased to 3000rpm and the oil temperature T2 and the main oil pressure P2 of the maximum displacement of the oil pump were measured.

Here, the main oil pressure P2 is the oil pressure corresponding to the first displacement described in the above embodiment.

If the main oil pressure P11 and the main oil pressure P12 are not in the normal range, S408 is performed: a lubrication system fault is determined.

S409, inquiring the normal pressure range stored by the ECU according to the engine oil temperature T2.

S410, judging whether the main oil pressure P2 of the maximum displacement of the oil pump is in a normal pressure range.

If the main oil pressure P2 is within the normal pressure range, S411 is executed: and determining the self-checking passing of the lubrication system.

If the main oil pressure P2 is not within the normal pressure range, the above S408 is performed: a lubrication system fault is determined.

In this embodiment of the application, because engine oil viscosity is high when the engine is started, therefore, engine oil pressure will be high, and the oil pump is maximum discharge, and the oil pump relief valve is opened, at this time, whether the oil pump relief valve opening function is normal is judged through main oil duct oil pressure P2.

If P11, P12 and P2 are all within the normal oil pressure range, the engine lubrication system self-tests pass. If P11, P12 and P2 exceed the normal oil pressure range, the self-test is not passed, the driver is notified of the lubrication system failure, and it is possible to determine which part of the lubrication system fails. For example, if both P11 and P12 are in the normal range, it can be judged that the oil pump displacement regulating function is normal and the oil pump performance is normal, and the lubrication system oil line is normal; and if the P2 is in the normal range, judging that the oil pump relief valve is normal in function.

As shown in fig. 5, after determining a failure of the engine lubrication system, the following steps may be performed:

s501, judging whether the engine oil pressure is alarmed.

If the alarm is given, S502 is executed: the driver is informed that the vehicle is not to be moved, and the vehicle is stopped to wait for rescue.

If not, execution S503: engine torque limit, vehicle speed limit, and notify the driver to the repair shop for detection.

Fig. 6 is a schematic diagram of a detection device according to an embodiment of the present application, as shown in fig. 6, the detection device 600 includes:

a first measurement unit 601 for measuring a first oil pressure when the engine is in an idle state;

a second measurement unit 602 configured to measure a second oil pressure when a rotation speed of the engine reaches a target rotation speed, in a case where the first oil pressure satisfies a set condition;

A first determining unit 603 configured to determine an operating state of an oil pump of the engine according to the first oil pressure;

and a second determining unit 604, configured to determine an operating state of an oil pump relief valve of the engine according to the second oil pressure when the operating state of the oil pump is a normal state.

In some embodiments, in the case where the engine oil pump is a variable displacement oil pump, the displacement of the variable displacement oil pump includes: a first displacement and a second displacement, the first displacement being greater than the second displacement; the first measurement unit 601 is further configured to:

measuring the oil pressure corresponding to the first displacement when the engine is in the idle state;

and measuring the oil pressure corresponding to the second displacement when the engine is in the idle state.

In some embodiments, the detection apparatus 600 further comprises: a judging unit configured to:

before measuring a second oil pressure when the rotating speed of the engine reaches a target rotating speed, judging whether the first oil pressure is in a first oil pressure range corresponding to a first oil temperature;

and if the first oil pressure is within the first oil pressure range, determining that the first oil pressure meets the set condition.

In some embodiments, the first measurement unit 601 is further configured to:

measuring a first oil temperature of the engine in the idle state before the operating state of the oil pump of the engine is determined based on the first oil pressure;

and determining a first engine oil pressure range corresponding to the first engine oil temperature.

In some embodiments, the first determining unit 603 is further configured to:

judging whether the first oil pressure is in the first oil pressure range or not under the condition that an oil pump of the engine is a fixed displacement oil pump;

and if the first oil pressure is in the first oil pressure range, determining that the working state of the oil pump of the engine is a normal state.

In some embodiments, the second determining unit 604 is further configured to:

in the case where the oil pump of the engine is a variable displacement oil pump, the displacement of the variable displacement oil pump includes: a first displacement and a second displacement, the first displacement being greater than the second displacement, the first oil pressure comprising: judging whether the oil pressure corresponding to the first displacement is within the first oil pressure range or not;

Judging whether the oil pressure corresponding to the second displacement is in the first oil pressure range;

and if the oil pressure corresponding to the first displacement and the oil pressure corresponding to the second displacement are in the first oil pressure range, determining that the working state of the oil pump of the engine is a normal state.

In some embodiments, the second measurement unit 602 is further configured to:

before the working state of an oil pump relief valve of the engine is determined according to the second oil pressure, measuring a second oil temperature when the rotating speed of the engine reaches the target rotating speed;

and determining a second oil pressure range corresponding to the second oil temperature.

In some embodiments, the second determining unit 604 is further configured to:

judging whether the second oil pressure is in the second oil pressure range or not under the condition that the oil pump of the engine is a fixed displacement oil pump;

and if the second engine oil pressure is in the second engine oil pressure range, determining that the working state of an engine oil pump relief valve of the engine is a normal state.

In some embodiments, the second determining unit 604 is further configured to:

in the case where the oil pump of the engine is a variable displacement oil pump, the displacement of the variable displacement oil pump includes: the first displacement, the second oil pressure includes: judging whether the oil pressure corresponding to the first displacement is in the second oil pressure range or not;

And if the oil pressure corresponding to the first displacement is in the second oil pressure range, determining that the working state of an oil pump relief valve of the engine is a normal state.

The embodiment of the application also provides an electronic device, which comprises a memory and a processor, wherein the memory stores a computer program capable of running on the processor, and the processor executes the program to realize the detection method provided in the embodiment.

Here, the electronic device is, for example, the detection device described in the above embodiment.

The present embodiment also provides a storage medium, that is, a computer-readable storage medium, on which a computer program is stored, which when executed by a processor, implements the detection method provided in the above embodiment.

It should be noted here that: the description of the storage medium and apparatus embodiments above is similar to that of the method embodiments described above, with similar benefits as the method embodiments. For technical details not disclosed in the embodiments of the storage medium and the apparatus of the present application, please refer to the description of the method embodiments of the present application for understanding.

It should be noted that fig. 7 is a schematic diagram of a hardware entity of an electronic device according to an embodiment of the present application, as shown in fig. 7, the electronic device 700 includes: a processor 701, at least one communication bus 702, at least one external communication interface 704, and memory 705. Wherein the communication bus 702 is configured to enable connected communication between these components. In an example, the electronic device 700 further includes: user interface 703, wherein user interface 703 may comprise a display screen, and external communication interface 704 may comprise a standard wired interface and a wireless interface.

The memory 705 is configured to store instructions and applications executable by the processor 701, and may also cache data (e.g., image data, audio data, voice communication data, and video communication data) to be processed or processed by various modules in the processor 701 and the electronic device, which may be implemented by a FLASH memory (FLASH) or a random access memory (Random Access Memory, RAM).

It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application. The foregoing embodiment numbers of the present application are merely for describing, and do not represent advantages or disadvantages of the embodiments.

It should 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the units is only one logical function division, and there may be other divisions in practice, such as: multiple units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or units, whether electrically, mechanically, or otherwise.

The units described above as separate components may or may not be physically separate, and components shown as units may or may not be physical units; can be located in one place or distributed to a plurality of network units; some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may be separately used as one unit, or two or more units may be integrated in one unit; the integrated units may be implemented in hardware or in hardware plus software functional units.

Those of ordinary skill in the art will appreciate that: all or part of the steps for implementing the above method embodiments may be implemented by hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, where the program, when executed, performs steps including the above method embodiments; and the aforementioned storage medium includes: a mobile storage device, a Read Only Memory (ROM), a magnetic disk or an optical disk, or the like, which can store program codes.

Alternatively, the integrated units described above may be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product. Based on such understanding, the technical solutions of the embodiments of the present application may be essentially or partially contributing to the related art, and the computer software product may be stored in a storage medium, and include several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a removable storage device, a ROM, a magnetic disk, or an optical disk.

The foregoing is merely an embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A method of detection, the method comprising:

under the condition that a pressure relief valve of an oil pump is not opened, measuring first oil pressure when an engine is in an idle state;

when the first engine oil pressure meets a set condition, the rotating speed of the engine is increased to a target rotating speed, after the rotating speed of the engine is increased to the target rotating speed, the oil pump relief valve is opened, and the second engine oil pressure when the rotating speed of the engine reaches the target rotating speed is measured;

determining the working state of an engine oil pump of the engine according to the first engine oil pressure;

and under the condition that the working state of the engine oil pump is a normal state, determining the working state of an engine oil pump relief valve of the engine according to the second engine oil pressure.

2. The method of claim 1, wherein in the event that the engine oil pump is a variable displacement oil pump, the displacement of the variable displacement oil pump comprises: a first displacement and a second displacement, the first displacement being greater than the second displacement;

correspondingly, the measuring the first oil pressure when the engine is in the idle state includes:

measuring the oil pressure corresponding to the first displacement when the engine is in the idle state;

And measuring the oil pressure corresponding to the second displacement when the engine is in the idle state.

3. The method of claim 1, wherein prior to measuring the second oil pressure at which the rotational speed of the engine reaches a target rotational speed, the method further comprises:

judging whether the first engine oil pressure is in a first engine oil pressure range corresponding to the first engine oil temperature;

and if the first oil pressure is within the first oil pressure range, determining that the first oil pressure meets the set condition.

4. The method of claim 1, wherein prior to said determining an operating state of an oil pump of said engine based on said first oil pressure, said method further comprises:

measuring a first oil temperature of the engine while the engine is in the idle state;

and determining a first engine oil pressure range corresponding to the first engine oil temperature.

5. The method of claim 4, wherein, in the case where the engine oil pump is a fixed displacement engine oil pump, the determining the operating state of the engine oil pump according to the first engine oil pressure includes:

Judging whether the first engine oil pressure is in the first engine oil pressure range;

and if the first oil pressure is in the first oil pressure range, determining that the working state of the oil pump of the engine is a normal state.

6. The method of claim 4, wherein in the event that the engine oil pump is a variable displacement oil pump, the displacement of the variable displacement oil pump comprises: a first displacement and a second displacement, the first displacement being greater than the second displacement, the first oil pressure comprising: the engine oil pressure corresponding to the first displacement and the engine oil pressure corresponding to the second displacement, the determining the working state of the engine oil pump of the engine according to the first engine oil pressure includes:

judging whether the oil pressure corresponding to the first displacement is in the first oil pressure range;

judging whether the oil pressure corresponding to the second displacement is in the first oil pressure range;

and if the oil pressure corresponding to the first displacement and the oil pressure corresponding to the second displacement are in the first oil pressure range, determining that the working state of the oil pump of the engine is a normal state.

7. The method of claim 1, wherein prior to determining an operating state of an oil pump relief valve of the engine based on the second oil pressure, the method further comprises:

measuring a second oil temperature when the rotational speed of the engine reaches the target rotational speed;

and determining a second oil pressure range corresponding to the second oil temperature.

8. The method of claim 7, wherein, in the case where the engine oil pump is a fixed displacement engine oil pump, the determining the operating state of the engine oil pump relief valve according to the second engine oil pressure includes:

judging whether the second engine oil pressure is in the second engine oil pressure range;

and if the second engine oil pressure is in the second engine oil pressure range, determining that the working state of an engine oil pump relief valve of the engine is a normal state.

9. The method of claim 7, wherein in the event that the engine oil pump is a variable displacement oil pump, the displacement of the variable displacement oil pump comprises: the first displacement, the second oil pressure includes: and determining the working state of an oil pump relief valve of the engine according to the second oil pressure, wherein the working state of the oil pump relief valve of the engine comprises the following steps:

Judging whether the oil pressure corresponding to the first displacement is in the second oil pressure range;

and if the oil pressure corresponding to the first displacement is in the second oil pressure range, determining that the working state of an oil pump relief valve of the engine is a normal state.

10. A detection device, the device comprising:

a first measurement unit for measuring a first oil pressure when the engine is in an idle state without opening the oil pump relief valve;

the second measuring unit is used for increasing the rotating speed of the engine to a target rotating speed under the condition that the first engine oil pressure meets a set condition, and after the rotating speed of the engine is increased to the target rotating speed, the oil pump relief valve is opened to measure the second engine oil pressure when the rotating speed of the engine reaches the target rotating speed;

a first determining unit configured to determine an operating state of an oil pump of the engine according to the first oil pressure;

and the second determining unit is used for determining the working state of an oil pump relief valve of the engine according to the second oil pressure.

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