CN111255542A - Device and method for detecting dilution rate of engine oil - Google Patents
Device and method for detecting dilution rate of engine oil Download PDFInfo
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- CN111255542A CN111255542A CN201910091775.7A CN201910091775A CN111255542A CN 111255542 A CN111255542 A CN 111255542A CN 201910091775 A CN201910091775 A CN 201910091775A CN 111255542 A CN111255542 A CN 111255542A
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- Prior art keywords
- heat shield
- engine oil
- oil
- dilution rate
- liquid level
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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
- 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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- 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
- F01M11/12—Indicating devices; Other safety devices concerning lubricant level
-
- 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
- F01M2011/14—Indicating devices; Other safety devices for indicating the necessity to change the oil
- F01M2011/148—Indicating devices; Other safety devices for indicating the necessity to change the oil by considering viscosity
Abstract
The invention discloses a device and a method for detecting the dilution rate of engine oil, wherein the device comprises: a measurement assembly and a connector assembly; the measurement assembly includes: resistance wire, heat shield, switch; the resistance wire is arranged in the heat shield and connected with the bottom of the heat shield, the switch is arranged at the bottom of the heat shield, and the interior of the heat shield is communicated with the engine oil sump through the switch; the measuring assembly is connected with an Electronic Control Unit (ECU) through the connector assembly. Wherein, under the condition of insulating heat exchanger and engine oil pan intercommunication, guaranteed that the liquid level in the engine oil pan is the same with the liquid level in the insulating heat exchanger to, after the engine oil liquid level is stable, through the change of the resistance of the interior resistance wire of insulating heat exchanger, realize the detection to the liquid level change, and then obtain the engine oil dilution rate. Therefore, automatic measurement of the dilution rate of the engine oil is realized, and real-time monitoring of the dilution rate of the engine oil is realized.
Description
This application claims priority from a domestic application filed on 03.12.2018, entitled "a device for detecting oil dilution rate", by the Bureau of Chinese patent office, application No. 201822019557.6, the entire contents of which are incorporated herein by reference.
Technical Field
The invention relates to the technical field of engine control, in particular to a device and a method for detecting engine oil dilution rate.
Background
At present, light vehicles are generally in a DPF regeneration mode of far-back injection, and the principle of the mode is that Diesel oil is far-back injected from an oil injector, the injected Diesel oil does not participate in combustion in a cylinder, stays in the cylinder for a period of time, is discharged into a DOC (Diesel particulate filter) for post-treatment along with exhaust gas through an exhaust valve, reacts with oxygen here to release heat, and the temperature in front of the DPF (Diesel particulate filter, Chinese Diesel particulate filter) is raised, so that the regeneration purpose is achieved.
However, a part of the diesel oil sprayed into the cylinder is adhered to the cylinder wall and flows to the oil pan of the engine oil through the gap between the diesel oil and the piston, so that the engine oil in the oil pan is mixed with certain diesel oil, the dilution rate of the engine oil is increased, the viscosity value is reduced, the lubricating performance of the engine oil and the service life of the engine oil are affected, and even the risk of cylinder scuffing is possibly caused.
In the prior art, whether the engine oil dilution rate changes is usually judged by manually observing the change of the liquid level, so that the real-time monitoring of the engine oil dilution rate cannot be realized.
Disclosure of Invention
In view of this, the invention discloses a device for detecting the dilution rate of engine oil, which realizes the real-time monitoring of the dilution rate of engine oil.
The invention discloses a device for detecting the dilution rate of engine oil, which comprises:
a measurement assembly and a connector assembly;
the measurement assembly includes: resistance wire, heat shield, switch;
the resistance wire is arranged in the heat shield and connected with the bottom of the heat shield, the switch is arranged at the bottom of the heat shield, and the interior of the heat shield is communicated with the engine oil sump through the switch;
the measuring assembly is connected with an Electronic Control Unit (ECU) through the connector assembly.
Optionally, the switch is a flow valve.
Optionally, the heat transfer coefficient of the heat shield is below a preset threshold.
Optionally, the heat shield is plastic.
Optionally, the resistance wire is a thermistor.
Optionally, the thermistor is a positive temperature coefficient thermistor.
Optionally, the height of the heat shield is the same as the height of the oil pan.
Optionally, the height of the resistance wire is higher than the maximum value of the oil level.
The embodiment of the invention also discloses a method for detecting the dilution rate of the engine oil, wherein the method is applied to the device for detecting the dilution rate of the engine oil, and comprises the following steps:
when the rotating speed of the engine is detected to be zero, the heat shield is switched to a closed state;
a preset current signal is acted on a resistance wire of the heat shield;
detecting the voltage value or the resistance value of a resistance wire in the heat shield;
calculating the current liquid level value according to the relation between a preset voltage value and the liquid level or the relation between a resistance value and the liquid level;
and calculating the oil dilution rate according to the current level value and the initial level value.
Optionally, after calculating the oil dilution ratio according to the current level value and the initial level value, the method further includes:
and opening the switch to enable the heat shield to be communicated with the oil sump.
The embodiment of the invention discloses a device and a method for detecting the dilution rate of engine oil, which comprises the following steps: a measurement assembly and a connector assembly; the measurement assembly includes: resistance wire, heat shield, switch; the resistance wire is arranged in the heat shield and connected with the bottom of the heat shield, the switch is arranged at the bottom of the heat shield, and the interior of the heat shield is communicated with the engine oil sump through the switch; the measuring assembly is connected with an Electronic Control Unit (ECU) through the connector assembly. Wherein, under the condition of insulating heat exchanger and engine oil pan intercommunication, guaranteed that the liquid level in the engine oil pan is the same with the liquid level in the insulating heat exchanger to, after the engine oil liquid level is stable, through the change of the resistance of the interior resistance wire of insulating heat exchanger, realize the detection to the liquid level change, and then obtain the engine oil dilution rate. Therefore, automatic measurement of the dilution rate of the engine oil is realized, and real-time monitoring of the dilution rate of the engine oil is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating an apparatus for detecting a dilution rate of engine oil according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a measurement assembly according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of another structure of an apparatus for detecting a dilution rate of engine oil according to an embodiment of the present invention;
FIG. 4 is a flow chart illustrating a method for detecting a dilution ratio of engine oil according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1 to fig. 3, there are shown schematic structural diagrams of an apparatus for detecting a dilution rate of engine oil according to an embodiment of the present invention, in this embodiment, the apparatus includes:
a measurement assembly 100 and an insert assembly 200;
the measurement assembly 100 is connected to an ECU (Electronic Control Unit) through a plug-in assembly 200.
Wherein the card assembly 200 receives signals from the ECU and sends signals from the measurement assembly 100 to the ECU.
Referring to fig. 2, the measurement assembly 100 includes: resistance wire 101, heat shield 102, switch 103;
the resistance wire 101 is arranged inside the heat shield 102 and connected with the bottom of the heat shield 102, the switch 103 is arranged at the bottom of the heat shield, and the inside of the heat shield is communicated with an oil sump through the switch;
in this embodiment, when detecting the machine oil liquid level in the machine oil drain pan to being in under the power-on state at ECU, the switch is in the closed condition, under other operating mode conditions, the switch is in the open mode, like this, when the switch was opened, the measurement assembly was in the connected state with the machine oil drain pan, and the machine oil liquid level in the heat shield was unanimous with the machine oil liquid level in the machine oil drain pan. In this embodiment, under the normal driving condition, the liquid level of oil pan can take place undulantly, is difficult to the accurate measurement liquid level this moment, and only at the in-process of parking electricity, the oil pan is static, and the liquid level is stable, can carry out the measurement of liquid level.
The specific measurement process may include:
when the rotating speed of the engine is zero and the ECU is powered on, the ECU sends a preset current signal to the measuring assembly through the plug-in assembly, the measuring assembly acts the current signal on the resistance wire, the resistance wire can generate heat due to the action of current, but the heat generated by the resistance wire immersed in the engine oil can be cooled by the engine oil, the temperature cannot rise, and the resistance wire on the liquid level of the engine oil can rise due to the temperature rise of the resistance wire. The measuring assembly can send the current resistance value or the current and the voltage value corresponding to the resistance value to the ECU through the plug-in assembly. And determining the current oil level according to the relation between the resistance or the voltage obtained by experiments in advance and the oil level.
And comparing the current oil level with the initial oil level to obtain the oil dilution rate.
In this embodiment, in order to ensure the heat insulation performance of the heat shield, the heat transfer coefficient of the heat shield needs to be lower than a preset threshold, and the selected material may be plastic, and preferably, the selected material may be plastic with a lower heat transfer coefficient.
In this embodiment, the switch 103 may be in any form, and preferably may be a flow valve.
In this embodiment, the resistance wire 101 may be a thermistor, and specifically, may be a thermistor with a positive temperature coefficient.
In this embodiment, in order to guarantee that the liquid level in the heat shield is the same with the liquid level in the oil pan, the height of heat shield is the same with the height of oil pan.
In addition, in the embodiment, the height of the resistance wire is higher than that of the oil liquid level.
In this embodiment, the device that detects machine oil dilution rate includes: a measurement assembly and a connector assembly; the measurement assembly includes: resistance wire, heat shield, switch; the resistance wire is arranged in the heat shield and connected with the bottom of the heat shield, the switch is arranged at the bottom of the heat shield, and the interior of the heat shield is communicated with the engine oil sump through the switch; the measuring assembly is connected with an Electronic Control Unit (ECU) through the connector assembly. Wherein, under the condition of separating heat exchanger and engine oil sump intercommunication, guaranteed that the liquid level in the engine oil sump is the same with the liquid level in the heat exchanger to, through the change of the resistance of resistance wire in the heat exchanger, realize the detection to the liquid level change, and then obtain the engine oil dilution rate. Therefore, automatic measurement of the dilution rate of the engine oil is realized, and real-time monitoring of the dilution rate of the engine oil is realized.
Referring to fig. 4, a flow chart of a method for detecting an oil dilution rate according to an embodiment of the present invention is shown, where the method is applied to the apparatus for detecting an oil dilution rate, and in this embodiment, the method includes:
s401: when the rotating speed of the engine is detected to be zero, the heat shield is switched to a closed state;
in this embodiment, in the running process of the vehicle, that is, in the running process of the engine, the oil level in the oil pan may be in a floating state, and in this case, the oil level cannot be measured. Therefore, it is necessary to ensure that the oil dilution ratio device measures the oil dilution ratio when the engine speed is zero and the ECU is powered on at this time.
And, when the engine speed is zero, as shown in fig. 1, the switch 103 may be turned off, so that the heat shield and the oil pan are in a relatively closed state, and at this time, the oil level in the heat shield and the oil level in the oil pan are leveled, so that the liquid level in the oil pan can be known by measuring the liquid level in the heat shield.
S402: a preset current signal is acted on a resistance wire of the heat shield;
in this embodiment, the ECU sends a preset current signal to the measurement assembly, wherein the preset current signal may be represented as that the magnitude of the current signal is preset. After the ECU sends the current signal to the measuring assembly, the current signal is acted in the resistance wire of the heat shield.
As shown in figure 1, when the switch is turned off, part of the resistance wire in the heat shield is immersed in the engine oil, and when a current value acts on the resistance wire, the part immersed in the engine oil generates heat which is cooled by the engine oil, and the temperature cannot rise. However, the resistance wire at the liquid level will increase in resistance value with increasing temperature.
S403: detecting the voltage value or the resistance value of a resistance wire in the heat shield;
s404: calculating the current liquid level value according to the relation between a preset voltage value and the liquid level or the relation between a resistance value and the liquid level;
in this embodiment, a technician obtains, through a large number of experiments, a relationship between a voltage value on the resistance wire and a liquid level, or a relationship between a resistance value on the resistance wire and a liquid level value, in advance according to a voltage value or a change in the resistance value on the resistance wire.
Therefore, after the resistance value of the resistance wire in the heat shield is changed, the resistance value of the resistance wire or the voltage value acting on the resistance wire can be obtained, and the liquid level value can be obtained according to the relation between the voltage value and the liquid level or the relation between the resistance value and the liquid level.
The calculation process of the voltage value is as follows: the product of the resistance value of the resistance wire and the value of the current acting on the resistance wire.
S405: and calculating the oil dilution rate according to the current level value and the initial level value.
For example, the following steps are carried out: suppose that the current level value is H1The initial level value is H2The dilution ratio of engine oil is D, then
And when the engine oil dilution rate is obtained, opening the switch to communicate the heat shield with the engine oil sump.
In this embodiment, the engine oil dilution rate is monitored based on the above-described apparatus, and the monitoring method includes: when the rotating speed of the engine is detected to be zero, the heat shield is switched to a closed state; and applying a preset current signal to the resistance wire of the heat shield to obtain a current resistance value or a current voltage value, calculating a current liquid level value according to the relation between the preset voltage value and the liquid level or the relation between the resistance value and the liquid level, and calculating the engine oil dilution rate according to the current liquid level value and the initial liquid level value. Like this, through the change of resistance wire resistance in the heat exchanger, realized the change to the interior machine oil liquid level of machine oil drain pan, and then realized the real-time supervision to the machine oil dilution rate.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an 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 article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An apparatus for detecting a dilution rate of engine oil, comprising:
a measurement assembly and a connector assembly;
the measurement assembly includes: resistance wire, heat shield, switch;
the resistance wire is arranged in the heat shield and connected with the bottom of the heat shield, the switch is arranged at the bottom of the heat shield, and the interior of the heat shield is communicated with the engine oil sump through the switch;
the measuring assembly is connected with an Electronic Control Unit (ECU) through the connector assembly.
2. The device of claim 1, wherein the switch is a flow valve.
3. The apparatus of claim 1, wherein the heat transfer coefficient of the heat shield is below a predetermined threshold.
4. The apparatus of claim 1, wherein the heat shield is plastic.
5. The device of claim 1, wherein the resistive wire is a thermistor.
6. The apparatus of claim 5, wherein the thermistor is a positive temperature coefficient thermistor.
7. The apparatus of claim 1, wherein the heat shield has a height that is the same as a height of an oil pan.
8. The device according to claim 1, characterized in that the height of the resistance wire is higher than the maximum value of the oil level.
9. A method for detecting a dilution rate of engine oil, the method being applied to the apparatus for detecting a dilution rate of engine oil, the method comprising:
when the rotating speed of the engine is detected to be zero, the heat shield is switched to a closed state;
a preset current signal is acted on a resistance wire of the heat shield;
detecting the voltage value or the resistance value of a resistance wire in the heat shield;
calculating the current liquid level value according to the relation between a preset voltage value and the liquid level or the relation between a resistance value and the liquid level;
and calculating the oil dilution rate according to the current level value and the initial level value.
10. The method of claim 9, further comprising, after calculating the oil dilution ratio based on the current level value and the initial level value:
and opening the switch to enable the heat shield to be communicated with the oil sump.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018220195576 | 2018-12-03 | ||
| CN201822019557 | 2018-12-03 |
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| CN111255542A true CN111255542A (en) | 2020-06-09 |
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| CN201910091775.7A Pending CN111255542A (en) | 2018-12-03 | 2019-01-30 | Device and method for detecting dilution rate of engine oil |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112160815A (en) * | 2020-09-21 | 2021-01-01 | 北京车和家信息技术有限公司 | Method and device for delaying engine oil dilution and vehicle |
| CN114272503A (en) * | 2021-12-15 | 2022-04-05 | 珠海格力电器股份有限公司 | Water tank, water level reminding method and device thereof, storage medium and hand sterilizer |
| CN115324684A (en) * | 2022-08-18 | 2022-11-11 | 中国第一汽车股份有限公司 | Engine fuel dilution monitoring device and method and automobile |
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