CN107587912A - A kind of oil cooler working condition diagnostic method and system - Google Patents
A kind of oil cooler working condition diagnostic method and system Download PDFInfo
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- CN107587912A CN107587912A CN201711075460.0A CN201711075460A CN107587912A CN 107587912 A CN107587912 A CN 107587912A CN 201711075460 A CN201711075460 A CN 201711075460A CN 107587912 A CN107587912 A CN 107587912A
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Abstract
The application, which provides a kind of oil cooler working condition diagnostic method and system, diagnostic method, to be included：The first temperature and second temperature are obtained, wherein, the first temperature is the temperature that machine oil passes through before oil cooler, and second temperature is temperature of the machine oil after oil cooler；Judge whether the difference of the first temperature and second temperature meets preparatory condition；If so, the working condition for then judging oil cooler is operation irregularity state.Because the present invention is combined before machine oil enters oil cooler, oil temperature when not cooled down, and the temperature of the machine oil after oil cooler out, it is normal condition or failure or deterioration state so as to obtain the working condition of oil cooler to judge the cooling capacity of oil cooler.For the working condition diagnostic method of oil cooler in the prior art, the diagnostic method of the application much sooner and accurately, and then can improve the reliability of engine.
Description
Technical field
The present invention relates to engine cool circulating technology field, more particularly to a kind of oil cooler working condition diagnosis side
Method and system.
Background technology
For diesel engine in operation process, machine oil absorbs certain heat when flowing through the friction surface of movement parts.With machine
The reciprocation cycle of oil, oil temperature can gradually rise, if oil temperature exceedes certain temperature, it may appear that engine oil viscosity is too low and loses profit
Sliding effect, does not play the cooling effect to friction pair yet, while oil temperature is too high will also result in machine oil oxidation deterioration.
The function of oil cooler is exactly that pressure cooling is carried out to machine oil, but cooler for engine oil work a period of time
After there is deterioration, or the failure such as oil cooler water route failure bypass, this can all cause oil temperature too high, Wu Faqi
To the effect to be cooled to engine friction pair, the problems such as causing aeronautic ATE, carbon distribution, friction pair serious wear.
Therefore, the working condition of oil cooler is extremely important, prior art mainly according to main oil gallery oil temperature (i.e.
Oil temperature after oil cooler) judge the working condition of oil cooler, but this method can not judge accurately and in time
Oil cooler working condition, influence to diagnose ageing and accuracy.
The content of the invention
In view of this, the present invention provides a kind of oil cooler working condition diagnostic method and system, to solve existing skill
Oil cooler working condition can not be judged in art accurately and in time, the problem of influenceing to diagnose ageing and accuracy.
To achieve the above object, the present invention provides following technical scheme：
A kind of oil cooler working condition diagnostic method, including：
The first temperature and second temperature are obtained, wherein, first temperature is the temperature that machine oil passes through before oil cooler,
The second temperature is temperature of the machine oil after the oil cooler；
Judge whether the difference of first temperature and the second temperature meets preparatory condition；
If so, the working condition for then judging the oil cooler is operation irregularity state.
Preferably, in addition to：
If it is not, then return to the first temperature of the acquisition and second temperature.
Preferably,
The preparatory condition is less than preset temperature range.
Preferably, in addition to：
Judge whether engine is equipped with machine oil thermostat.
Preferably, it is described to judge whether engine is equipped with machine oil thermostat positioned at the first temperature of the acquisition and second temperature
Before.
Preferably, it is described judge engine whether equipped with machine oil thermostat it is described acquisition the first temperature and second temperature it
Afterwards, and before whether the difference for judging first temperature and the second temperature meets preparatory condition.
Preferably, if the engine is equipped with machine oil thermostat, in addition to：
Judge whether first temperature is more than the opening temperature of the machine oil thermostat；
If so, the machine oil thermostat is in open mode, and judge the difference of first temperature and the second temperature
Whether preparatory condition is met；
If it is not, the machine oil thermostat is closed, and terminate.
The present invention also provides a kind of oil cooler working condition diagnostic system, for realizing machine oil cooling recited above
Device working condition diagnostic method, the oil cooler working condition diagnostic system include：
First temperature acquisition module, for obtaining first temperature；
Second temperature acquisition module, for obtaining the second temperature；
First judge module, for judging whether the difference of first temperature and the second temperature meets preparatory condition.
Preferably, first temperature acquisition module is the first TEMP of oil temperature in detection engine sump tank
Device；
Wherein, first temperature sensor is the oil sump temperature sensor with heater, or is electronic machine
The temperature sensor of dipstick bottom, or increase the temperature sensor in the engine sump tank newly.
Preferably, the second temperature acquisition module is second temperature sensor in main oil gallery, the main oil gallery
Export and connect with the oil cooler.
Understood via above-mentioned technical scheme, oil cooler working condition diagnostic method provided by the invention, including：Obtain
The first temperature and second temperature are taken, wherein, first temperature is the temperature that machine oil passes through before oil cooler, second temperature
Spend the temperature after the oil cooler for the machine oil；Judge first temperature and the second temperature difference whether
Meet preparatory condition；If so, the working condition for then judging the oil cooler is operation irregularity state.
Due to oil cooler working condition diagnostic method provided by the invention, combine machine oil and enter oil cooler
Before, oil temperature when not cooled down, and the temperature of the machine oil after oil cooler out, cooled down according to by machine oil
The front and rear oil temperature of device cooling is poor, the cooling capacity of oil cooler is judged, so as to obtain the working condition of oil cooler
For normal condition or failure or deterioration state.Judge relative to the temperature after being cooled down in the prior art according only to machine oil
The working condition of oil cooler, the diagnostic method of the application much sooner and accurately, and then can improve engine
Reliability.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
The embodiment of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is a kind of oil cooler working condition diagnostic method schematic flow sheet provided in an embodiment of the present invention；
Fig. 2 is a kind of oil cooler working condition diagnostic method schematic flow sheet that another embodiment of the present invention provides；
Fig. 3 is a kind of function structure chart of oil cooler working condition diagnostic system provided in an embodiment of the present invention；
Fig. 4 is a kind of structural representation of oil cooler working condition diagnostic system provided in an embodiment of the present invention.
Embodiment
Just as described in the background section, the working condition of oil cooler can not obtain accurately and in time in the prior art
Arrive.
Inventor has found, causes above-mentioned phenomenon reason, in the prior art, generally use main oil gallery inner engine oil temperature
(oil temperature i.e. after oil cooler) judges the working condition of oil cooler to be abnormal or normal, specifically, working as
When main oil gallery temperature is too high, then oil cooler possible breakdown or deterioration are judged.
But inventor is in practice, it has been found that main oil gallery temperature is too high, reason have it is a variety of, for example, it is possible to be engine
Overload operation, the fit clearance of each lubricant housings are improper, cooling system goes wrong, not necessarily oil cooler work(
Can decline or failure；And when engine other systems are normal, low speed and load or environment temperature than it is relatively low when, typically will not
There is the too high situation of main oil gallery temperature, even if oil cooler operation irregularity, because main oil gallery temperature will not be too high, then judge
As a result and oil cooler is working properly, and can not monitor the failure of oil cooler.Therefore, merely according in main oil gallery
Oil temperature can not judge oil cooler working condition accurately and in time.
Based on this, the present invention provides a kind of oil cooler working condition diagnostic method, including：
The first temperature and second temperature are obtained, wherein, first temperature is the temperature that machine oil passes through before oil cooler,
The second temperature is temperature of the machine oil after the oil cooler；
Judge whether the difference of first temperature and the second temperature meets preparatory condition；
If so, the working condition for then judging the oil cooler is operation irregularity state.
Due to oil cooler working condition diagnostic method provided by the invention, combine machine oil and enter oil cooler
Before, oil temperature when not cooled down, and the temperature of the machine oil after oil cooler out, cooled down according to by machine oil
The front and rear oil temperature of device cooling is poor, the cooling capacity of oil cooler is judged, so as to obtain the working condition of oil cooler
For normal condition or failure or deterioration state.Judge relative to the temperature after being cooled down in the prior art according only to machine oil
The working condition of oil cooler, the diagnostic method of the application much sooner and accurately, and then can improve engine
Reliability.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Fig. 1 is referred to, Fig. 1 is that a kind of oil cooler working condition diagnostic method flow provided in an embodiment of the present invention is shown
It is intended to, oil cooler working condition diagnostic method provided in an embodiment of the present invention, including：
S101：The first temperature and second temperature are obtained, wherein, first temperature is before machine oil passes through oil cooler
Temperature, the second temperature are temperature of the machine oil after the oil cooler；
The machine oil that the oil temperature before oil cooler is specifically which part of engine is not defined through in the application
Temperature, likewise, the oil temperature not also being defined through after oil cooler is specifically the machine oil of which part of engine.Can
Select, the oil temperature passed through for the accurate acquisition of guarantee before and after oil cooler, select to disembark oil cooler most in the present embodiment
Two near engine components are used as the oil temperature before and after oil cooler, be also by the oil temperature in main oil gallery equivalent to
For the oil temperature after cooler for engine oil, by the oil temperature in oil sump equivalent to before for cooler for engine oil
Oil temperature.
In addition, also not limiting the acquisition sequencing of the first temperature and second temperature in the present embodiment, the first temperature is obtained
Can after second temperature is obtained, can also before second temperature is obtained, have or, the first temperature and second temperature are simultaneously
Obtain.To improve detection efficiency, detection time is saved, the first temperature and second temperature can obtain simultaneously；In its of the present invention
In his embodiment, optionally, the first temperature is first obtained, obtaining second temperature.
S102：Judge whether the difference of first temperature and the second temperature meets preparatory condition；
Preparatory condition described in the present embodiment be less than preset temperature range, wherein, do not limited in the present embodiment described pre-
If the actual temp scope of temperature range, can be limited according to the cooling capacity during normal work of actual engine oil cooler.
The cooling performance of different oil cooler can with different, such as the oil cooler of different process manufacture cooling performance not
Together.Therefore, the preparatory condition in the present embodiment is also to change therewith.Such as, by the normal cold of data statistics oil cooler
But ability is that oil temperature cooling is declined into 15 DEG C -20 DEG C, then the preset temperature range is set into 15 DEG C -20 DEG C.If that is,
Machine oil is 110 DEG C before oil cooler is entered, then after oil cooler, when the temperature of machine oil is reduced to 95 DEG C -90 DEG C
For the normal operating conditions of oil cooler.And when machine oil chilling temperature is not up to standard, when the temperature also just reduced is less than 15 DEG C,
It is then abnormal for the working condition of oil cooler.
That is, if S102 judged result is yes, S103：Judge that the working condition of the oil cooler is different to work
Normal state.
It should be noted that the working condition for not limiting oil cooler in the present embodiment is specifically any situation extremely,
As long as the situation that cooling effect declines is the abnormal operation of oil cooler, optional in the present embodiment, the machine
The working condition of oil cooler includes failure or deterioration, specially cooler for engine oil work a period of time extremely
After occur deterioration or oil cooler water route failure bypass.
If S102 judged result is no, that is, when judging first temperature and the second temperature in the present embodiment
Difference when being unsatisfactory for preparatory condition, then the working condition for illustrating oil cooler is the normal state of cooling, and function is normal, because
This, then continue to obtain first temperature and the second temperature.That is, if it is not, then return to the first temperature of the acquisition and the
Two temperature.
That is, in the embodiment of the present invention, the first temperature and second temperature persistently obtain, and then judge that both differences are
It is no to meet preparatory condition, if so, then judging that working condition exception occurs in oil cooler.If it is not, then obtaining again, and judge,
So as to realize the timely detection of the working condition of oil cooler, and due to reference to the oil temperature before oil cooler and
Oil temperature after oil cooler, it is whether problematic so as to more be accurately judged to oil cooler.That is, the present invention is real
Apply the oil cooler working condition diagnostic method provided in example in terms of existing technologies, can be also more accurate much sooner
Really.
Due to oil cooler working condition diagnostic method provided in an embodiment of the present invention, combine machine oil and enter machine oil
Before cooler, oil temperature when not cooled down, and the temperature of the machine oil after oil cooler out, according to by machine
The front and rear oil temperature of oil cooler cooling is poor, the cooling capacity of oil cooler is judged, so as to obtain the work of oil cooler
It is normal condition or failure or deterioration state to make state.Relative to the temperature after being cooled down in the prior art according only to machine oil
Degree judges the working condition of oil cooler, and the diagnostic method of the application can much sooner and accurately.
In another embodiment of the present invention, a kind of oil cooler working condition diagnostic method is also disclosed, implements upper one
Also include on the basis of example：
Judge whether engine is equipped with machine oil thermostat.
It should be noted that machine oil thermostat is act as：Oil temperature than it is relatively low when, machine oil thermostat close, machine
Oil flows directly into oil filter through bleed off circuit, without oil cooler；When oil temperature is higher, machine oil thermostat is beaten
Open, machine oil flows to oil filter through oil cooler.In the case that engine includes machine oil thermostat, oil temperature and machine
Oily thermostat is relevant, it is possible to causes machine oil by oil cooler, therefore, in the present embodiment not include also judging that engine is
No the step of machine oil thermostat is housed.
Do not limited in the present embodiment and judge the step of whether engine is equipped with machine oil thermostat with obtaining the first temperature and the
Precedence relationship between the step of two temperature, judge engine whether equipped with machine oil thermostat can be located at obtain the first temperature and
Before second temperature, it can also be arranged on after obtaining the first temperature and second temperature, or, two steps perform simultaneously, this
This is not construed as limiting in embodiment.
For convenience of description, it is located in the present embodiment with " judging whether engine is equipped with machine oil thermostat " and " obtains the first temperature
Exemplified by after degree and second temperature ", a specific example is provided, to be described in detail, as shown in Fig. 2 Fig. 2 is real for the present invention
A kind of oil cooler working condition diagnostic method schematic flow sheet of example offer, the oil cooler working condition diagnosis are provided
Method includes：
S201：The first temperature and second temperature are obtained, wherein, first temperature is before machine oil passes through oil cooler
Temperature, the second temperature are temperature of the machine oil after the oil cooler；
Which part that the oil temperature before oil cooler is specifically engine is not defined through in the embodiment of the present invention
Oil temperature, likewise, the oil temperature not also being defined through after oil cooler is specifically which part of engine
Machine oil.Optionally, the oil temperature passed through before and after oil cooler is accurately obtained for guarantee, oil cooling of disembarking is selected in the present embodiment
But two nearest engine components of device are as the oil temperature before and after oil cooler, also i.e. by the oil temperature in main oil gallery
Equivalent to for the oil temperature after cooler for engine oil, by the oil temperature in oil sump equivalent to for engine motor oil it is cold
But the oil temperature before device.
In addition, also not limiting the acquisition sequencing of the first temperature and second temperature in the present embodiment, the first temperature is obtained
Can after second temperature is obtained, can also before second temperature is obtained, have or, the first temperature and second temperature are simultaneously
Obtain.To improve detection efficiency, detection time is saved, the first temperature and second temperature can obtain simultaneously；In its of the present invention
In his embodiment, optionally, the first temperature is first obtained, obtaining second temperature.
S202：Judge whether engine is equipped with machine oil thermostat；
If so, then perform S203；If it is not, then skipping S203, S204 is directly performed.
That is, if engine is equipped with machine oil thermostat, need to determine whether that machine oil thermostat is in unlatching
State, or closed mode, if closing, the bypass of oil cooler is opened, and machine oil is without oil cooler, machine oil cooling
Device is in off working state, it is therefore not necessary to be diagnosed to the working condition of oil cooler.And beaten when machine oil thermostat is in
During open state, machine oil is by oil cooler, and oil cooler is in running order, now, just to the work of oil cooler
State is diagnosed.
S203：Judge whether first temperature is more than the opening temperature of the machine oil thermostat；
If so, the machine oil thermostat is in open mode, and perform S204；
If it is not, the machine oil thermostat is closed, and terminate.
S204：Judge whether the difference of first temperature and the second temperature meets preparatory condition；
Preparatory condition described in the present embodiment be less than preset temperature range, wherein, do not limited in the present embodiment described pre-
If the actual temp scope of temperature range, can be limited according to the cooling capacity during normal work of actual engine oil cooler.
The cooling performance of different oil cooler can with different, such as the oil cooler of different process manufacture cooling performance not
Together.Therefore, the preparatory condition in the present embodiment is also to change therewith.Such as, by the normal cold of data statistics oil cooler
But ability is that oil temperature cooling is declined into 15 DEG C -20 DEG C, then the preset temperature range is set into 15 DEG C -20 DEG C.If that is,
Machine oil is 110 DEG C before oil cooler is entered, then after oil cooler, when the temperature of machine oil is reduced to 95 DEG C -90 DEG C
For the normal operating conditions of oil cooler.And when machine oil chilling temperature is not up to standard, when the temperature also just reduced is less than 15 DEG C,
It is then abnormal for the working condition of oil cooler.
I.e., if the determination result is YES, then into S205:The working condition for judging the oil cooler is operation irregularity shape
State.
The working condition for not limiting oil cooler in the present embodiment is specifically any situation extremely, as long as cooling effect
The situation of decline is the abnormal operation of oil cooler, optional in the present embodiment, the work of the oil cooler
Abnormal state includes failure or deterioration, and specially cooler for engine oil deterioration occurs after work a period of time
Or oil cooler water route failure bypass.
It should be noted that when the difference for judging first temperature and the second temperature is unsatisfactory for presetting in the present embodiment
During condition, then the working condition for illustrating oil cooler is the normal state of cooling, and function is normal, therefore, then continues to obtain institute
State the first temperature and the second temperature.That is, if it is not, then return to the first temperature of the acquisition and second temperature.
Even judged result is no then to return to the first temperature of the acquisition and second temperature.
In above example, the acquisition order of the first temperature and second temperature is not limited, however, it is desirable to explanation
It is, if judging whether engine is located at before obtaining the first temperature and second temperature equipped with machine oil thermostat, to judge hair
Whether motivation is equipped with after machine oil thermostat, it is necessary at least obtain the first temperature, could judge whether first temperature is more than machine
The opening temperature of oily thermostat, then could perform follow-up corresponding steps, and therefore, no matter whether engine is equipped with machine oil section temperature
Device, it is required at least first obtaining the first temperature, as long as now the obtaining step of second temperature is judging first temperature and institute
Whether the difference for stating second temperature meets that preparatory condition before, is not construed as limiting in the present embodiment to this.
Due to oil cooler working condition diagnostic method provided in an embodiment of the present invention, combine machine oil and enter machine oil
Before cooler, oil temperature when not cooled down, and the temperature of the machine oil after oil cooler out, according to by machine
The front and rear oil temperature of oil cooler cooling is poor, the cooling capacity of oil cooler is judged, so as to obtain the work of oil cooler
It is normal condition or failure or deterioration state to make state.Relative to the temperature after being cooled down in the prior art according only to machine oil
Degree judges the working condition of oil cooler, and the diagnostic method of the application can much sooner and accurately.
In addition, the judgment step of machine oil thermostat is also added into the present embodiment so that the working condition of oil cooler
Diagnostic method is more perfect.
A kind of working condition diagnostic system of oil cooler is provided in yet another embodiment of the invention, as shown in figure 3, should
Diagnostic system includes：
First temperature acquisition module 11, for obtaining first temperature；
Second temperature acquisition module 12, for obtaining the second temperature；
Whether the first judge module 13, the difference for judging first temperature and the second temperature meet default bar
Part.
The concrete structure of first temperature acquisition module and second temperature acquisition module is not limited in the present embodiment, as long as
First temperature and the second temperature can be obtained.Namely by the oil temperature before oil cooler and by machine
Oil temperature after oil cooler.
To ensure the accuracy of oil temperature before and after oil cooler, selection oil cooler of disembarking is nearest in the present embodiment
Two engine components are as the oil temperature before and after oil cooler, also i.e. by the oil temperature in main oil gallery equivalent to for hair
Oil temperature after motivation oil cooler, by the oil temperature in oil sump equivalent to for the machine before cooler for engine oil
Oil temperature.
Due to being also equipped with temperature sensor in engine main oil gallery in the prior art, for the machine oil for judging to enter in body
Whether temperature is normal, and what the sensor detected is the equal of the oil temperature after oil cooler.And main oil gallery cools down with machine oil
The outlet connection of device, namely the temperature that there is temperature sensor can be used in detecting the machine oil of main oil gallery inside main oil gallery, so
The second temperature acquisition module can be the second temperature sensor in main oil gallery.
The first temperature acquisition module is the first TEMP of oil temperature in detection engine sump tank in the present embodiment
Device does not have temperature sensor, at this point it is possible in oil sump, it is necessary to explanation in the engine sump tank of some vehicles
Mounting temperature sensor is newly increased as first temperature sensor.
And with commonly used, the raising that user is required comfortableness of sensor technology, in certain areas, electronics machine oil
Chi turns into heavy truck standard configuration, electronics oil rule：Hot wire type liquid level sensor, can detect engine oil level, and bottom passes equipped with temperature
Sensor；The bottom of hot wire type electronics oil rule is equipped with temperature sensor, for correcting engine oil level.In addition, there is heater
Engine sump tank is typically also equipped with temperature sensor, for controlling the start and stop of heater.The detection of these temperature sensors
It is the oil temperature of oil sump, is the equal of the oil temperature before cooler for engine oil.
That is, first temperature sensor is the oil sump temperature sensor with heater, or it is electronic machine
The temperature sensor of dipstick bottom, or increase the temperature sensor in the engine sump tank newly.
The oil temperature before and after oil cooler can be obtained using these temperature sensors, without changing hardware configuration.
Oil cooler working condition diagnostic system structure is as shown in Figure 4.
In the present embodiment, by the use of the temperature sensor in the existing oil sump of engine as the first temperature sensor 41,
For detecting oil sump oil temperature T1, and temperature sensor in main oil gallery is used for as second temperature sensor 42
Main oil gallery oil temperature T2 is detected, and these detection signals are transferred to ECU (Electronic Control Unit, electronics control
Unit processed) oil temperature (T1 and T2) before and after oil cooler make the difference and is calculated (T1-T2) by 43, ECU43, and is incited somebody to action
Obtained (T1-T2) compares with the preset temperature range for pre-setting and being stored in ECU43, warm before and after oil cooler
When difference is less than preset temperature range, then judges oil cooler operation irregularity, send warning.
Namely it is used to judge whether the difference of first temperature and the second temperature meets preparatory condition in the present embodiment
The first judge module be judge module in the ECU.
In addition, ECU can also include the second judge module, for judging whether machine oil thermostat is housed on engine, such as
Machine oil thermostat is housed on fruit engine, then also includes the 3rd judge module in ECU, the 3rd judge module is used to judging the
Whether one temperature is more than the opening temperature of machine oil thermostat, if so, then machine oil thermostat is in open mode, carries out follow-up first
The judgement action of judge module.If it is not, then machine oil thermostat is closed, and now, in the case that oil cooler bypasses,
The working condition of oil cooler is not diagnosed.
Due to oil cooler working condition diagnostic system provided in an embodiment of the present invention, for realizing in above example
The oil cooler working condition diagnostic method of offer, and diagnostic method above combines machine oil and enters oil cooler
Before, oil temperature when not cooled down, and the temperature of the machine oil after oil cooler out, cooled down according to by machine oil
The front and rear oil temperature of device cooling is poor, the cooling capacity of oil cooler is judged, so as to obtain the working condition of oil cooler
For normal condition or failure or deterioration state.Judge relative to the temperature after being cooled down in the prior art according only to machine oil
The working condition of oil cooler, the diagnostic method of the application much sooner and accurately, and then can improve engine
Reliability.
By the machine oil temperature difference before and after oil cooler in the embodiment of the present invention, the working condition of oil cooler is judged,
So that the working condition diagnosis of oil cooler is more accurate, timely, so as to improve engine reliability；Also, at certain
In a little engine structures, using the existing temperature sensor of engine, without increasing temperature sensor, without changing hardware knot
Structure, namely the application provide oil cooler working condition diagnostic method and system can utilize it is more of the prior art
Structure, without re-starting structure setting.
It should be noted that each embodiment in this specification is described by the way of progressive, each embodiment weight
Point explanation is all difference with other embodiment, between each embodiment identical similar part mutually referring to.
The foregoing description of the disclosed embodiments, professional and technical personnel in the field are enable to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (10)
- A kind of 1. oil cooler working condition diagnostic method, it is characterised in that including：The first temperature and second temperature are obtained, wherein, first temperature is the temperature that machine oil passes through before oil cooler, described Second temperature is temperature of the machine oil after the oil cooler；Judge whether the difference of first temperature and the second temperature meets preparatory condition；If so, the working condition for then judging the oil cooler is operation irregularity state.
- 2. oil cooler working condition diagnostic method according to claim 1, it is characterised in that also include：If it is not, then return to the first temperature of the acquisition and second temperature.
- 3. oil cooler working condition diagnostic method according to claim 2, it is characterised in thatThe preparatory condition is less than preset temperature range.
- 4. oil cooler working condition diagnostic method according to claim 1, it is characterised in that also include：Judge whether engine is equipped with machine oil thermostat.
- 5. oil cooler working condition diagnostic method according to claim 4, it is characterised in thatIt is described to judge whether engine is located at before the first temperature of the acquisition and second temperature equipped with machine oil thermostat.
- 6. oil cooler working condition diagnostic method according to claim 4, it is characterised in thatIt is described to judge whether engine is equipped with machine oil thermostat after the first temperature of the acquisition and second temperature, and described Before judging whether the difference of first temperature and the second temperature meets preparatory condition.
- 7. oil cooler working condition diagnostic method according to claim 6, it is characterised in that if the engine fills Organic oil thermostat, then also include：Judge whether first temperature is more than the opening temperature of the machine oil thermostat；If so, then the machine oil thermostat is in open mode, and judge that the difference of first temperature and the second temperature is It is no to meet preparatory condition；If it is not, then the machine oil thermostat is closed, and terminate.
- 8. a kind of oil cooler working condition diagnostic system, it is characterised in that for realizing that the machine oil described in claim 1 is cold But device working condition diagnostic method, the oil cooler working condition diagnostic system include：First temperature acquisition module, for obtaining first temperature；Second temperature acquisition module, for obtaining the second temperature；First judge module, for judging whether the difference of first temperature and the second temperature meets preparatory condition.
- 9. oil cooler working condition diagnostic system according to claim 8, it is characterised in that first temperature obtains Modulus block is the first temperature sensor of oil temperature in detection engine sump tank；Wherein, first temperature sensor is the oil sump temperature sensor with heater, or is electronics oil rule The temperature sensor of bottom, or increase the temperature sensor in the engine sump tank newly.
- 10. oil cooler working condition diagnostic system according to claim 8, it is characterised in that the second temperature Acquisition module is the second temperature sensor in main oil gallery, and the main oil gallery connects with oil cooler outlet.
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