CN113606125A - Cooling water pump diagnosis method and device and electronic equipment - Google Patents

Cooling water pump diagnosis method and device and electronic equipment Download PDF

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Publication number
CN113606125A
CN113606125A CN202110997756.8A CN202110997756A CN113606125A CN 113606125 A CN113606125 A CN 113606125A CN 202110997756 A CN202110997756 A CN 202110997756A CN 113606125 A CN113606125 A CN 113606125A
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temperature
water pump
cooling water
fault
threshold
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CN113606125B (en
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刘启胜
陈玉俊
柯炯
张伟
谢文
刘嘉璐
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Dongfeng Trucks Co ltd
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Dongfeng Trucks Co ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B51/00—Testing machines, pumps, or pumping installations
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/14—Safety means against, or active at, failure of coolant-pumps drives, e.g. shutting engine down; Means for indicating functioning of coolant pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2025/00—Measuring
    • F01P2025/08—Temperature

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Abstract

The application discloses cooling water pump diagnosis method, device and electronic equipment relates to fault diagnosis technical field, and the method is used for diagnosing the cooling water pump of motor, and motor, radiator and cooling water pump connect gradually and form cooling circulation circuit, and it includes the step: obtaining the required output of the cooling water pump after the diagnostic entry condition of the cooling water pump is met; when the temperature sensor at the water outlet of the radiator is not in fault and the duration time of the required output which is greater than or equal to the first output threshold reaches the first time threshold, the water outlet temperature starting from the duration time is used as the first initial temperature, the water outlet temperature is obtained and used as the first judgment temperature, and the fault of the cooling water pump is judged until the difference value between the first initial temperature and the first judgment temperature is smaller than the first temperature threshold. According to the method and the device, the working state of the cooling water pump can be timely and accurately judged, meanwhile, a diagnosis interface is not required to be additionally arranged on the cooling water pump, occupation of pin resources of the controller is reduced, and cost is reduced.

Description

Cooling water pump diagnosis method and device and electronic equipment
Technical Field
The application relates to the technical field of fault diagnosis, in particular to a cooling water pump diagnosis method and device and electronic equipment.
Background
At present, in the working process of a motor controller system and a driving motor, a lot of heat is generated due to winding loss, iron core loss, IGBT (Insulated Gate Bipolar Transistor) module loss and the like, and if the heat is always accumulated and cannot be dissipated, the temperature of the driving motor and the motor controller is increased. When the temperature is increased to the maximum temperature value allowed by the material, the physical properties of the material of the driving motor can be changed, so that the performance is deteriorated, and in addition, the insulating material of the driving motor can also lose the insulating capability, so that the safety performance of the system is influenced; for the motor controller module, the temperature rise not only affects the working efficiency, but also shortens the service life and even burns out, so that the motor and the motor controller system can not work.
The cooling liquid is used as a carrier for heat exchange in the motor cooling system and can circularly flow in the motor cooling system, so that the heat of the motor and the motor controller is taken away. The cooling water pump of motor provides power for the coolant liquid, and the power of cooling water pump is bigger, and then the flow of coolant liquid is also bigger. Under the effect of cooling water pump, the coolant liquid that has a large amount of heats gets into and flows out from the delivery port of radiator from the water inlet of radiator, and in this process, based on the water conservancy diversion effect of radiator's cooling fan to the air for heat in the coolant liquid can be abundant transmit to the air in, realize the cooling.
However, since the cooling fan and the cooling water pump both adopt independent electric control modes, once the cooling water pump does not work, the heat of the motor and the motor controller cannot be taken away, and serious consequences are caused; in addition, the cooling fan still works at this time, which results in waste of energy consumption. Therefore, it is necessary to perform a fault diagnosis of the cooling water pump of the motor.
In the related art, when the cooling water pump performs fault diagnosis, in order to output fault diagnosis, the circuit design needs to be changed, a diagnosis interface needs to be added, and a diagnosis output line is separately added for the controller, so that the working state of the cooling water pump is judged by using the newly added diagnosis interface of the cooling water pump. Not only does it increase the complexity of the cooling water pump, but it also increases the cost of use.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a cooling water pump diagnosis method, a cooling water pump diagnosis device and electronic equipment so as to solve the problems of high complexity and high use cost of a cooling water pump in the related art.
The present application provides in a first aspect a method for diagnosing a cooling water pump of a motor, the method comprising the steps of:
obtaining the required output of the cooling water pump after the diagnostic entry condition of the cooling water pump is met;
when the temperature sensor at the water outlet of the radiator has no fault and the duration time of the demand output which is greater than or equal to the first output threshold reaches the first time threshold, the water outlet temperature starting from the duration time is used as the first initial temperature, the water outlet temperature is obtained and used as the first judgment temperature, and the fault of the cooling water pump is judged until the difference value between the first initial temperature and the first judgment temperature is smaller than the first temperature threshold.
In some embodiments, an all-in-one controller and a motor controller are further connected between the cooling water pump and the motor;
when the temperature sensor at the water outlet of the radiator has a fault and the duration time of the required output which is greater than or equal to the first output threshold reaches a second time threshold, the motor temperature, the motor controller temperature and the all-in-one controller temperature which begin with the duration time are respectively used as a second initial temperature, a third initial temperature and a fourth initial temperature;
and obtaining the motor temperature, the motor controller temperature and the all-in-one controller temperature as a second judgment temperature, a third judgment temperature and a fourth judgment temperature respectively, and judging the fault of the cooling water pump until the difference value between the second initial temperature and the second judgment temperature is smaller than a second temperature threshold value, the difference value between the third initial temperature and the third judgment temperature is smaller than a third temperature threshold value, and the difference value between the fourth initial temperature and the fourth judgment temperature is smaller than a fourth temperature threshold value.
In some embodiments, before obtaining the second determination temperature, the third determination temperature, and the fourth determination temperature, the method further includes:
prestoring a corresponding table of the minimum value of the required reduction of the ambient temperature, the vehicle speed and the motor temperature;
prestoring a corresponding table of the minimum value of the environmental temperature, the vehicle speed and the temperature required to be reduced of the motor controller;
prestoring a corresponding table of the ambient temperature, the vehicle speed and the minimum value required to be reduced by the temperature of the all-in-one controller;
and acquiring the ambient temperature and the vehicle speed, respectively looking up a table, acquiring the minimum value required to be reduced by the motor temperature as a second temperature threshold value, acquiring the minimum value required to be reduced by the motor controller temperature as a third temperature threshold value, and acquiring the minimum value required to be reduced by the all-in-one controller temperature as a fourth temperature threshold value.
In some embodiments, after obtaining the required output of the cooling water pump, the method further includes:
starting timing when the required output of the cooling water pump is greater than or equal to a first output threshold value;
and if the timing time does not reach the first time threshold value, the required output is smaller than the first output threshold value, and the timing is finished.
In some embodiments, the first time threshold is greater than the second time threshold.
In some embodiments, before obtaining the water outlet temperature as the first judgment temperature, the method further includes:
prestoring a corresponding table of the minimum value of the required reduction of the ambient temperature and the temperature of the water outlet of the radiator;
and acquiring the ambient temperature, and acquiring the minimum value required to be reduced by the temperature of the water outlet of the radiator as the first temperature threshold value based on the table look-up of the ambient temperature.
In some embodiments, after determining that the cooling water pump is faulty, the method further includes:
continuously acquiring a first judgment temperature;
and when the difference value between the first initial temperature and the first judgment temperature is greater than a first temperature threshold value, judging that the fault of the cooling water pump is cleared.
In some embodiments, the diagnostic entry condition is a first entry condition or a second entry condition;
the first entry condition includes:
receiving a refrigeration signal;
the cooling water pump has no electrical fault and the required output is greater than or equal to a first output threshold;
the temperature sensor has no fault and the temperature of the water outlet is greater than a fifth temperature threshold value, or the temperature sensor has a fault;
the fan at the radiator has no fault and the output duty ratio is greater than a second output threshold value;
the liquid level of a liquid level sensor of a liquid supplementing tank of the radiator is higher than a liquid level threshold value;
the second entry condition is:
and the fault diagnosis forced start switch of the cooling water pump is set to be 1.
The second aspect of the present application provides a cooling water pump diagnostic apparatus based on the above method, including:
the first judgment module is used for judging whether the diagnosis entering condition of the cooling water pump is met or not;
an acquisition module for acquiring a demand output of the cooling water pump when a diagnostic entry condition of the cooling water pump is satisfied;
the second judgment module is used for judging whether the temperature sensor fails or not;
and the diagnosis module is used for judging the fault of the cooling water pump when the temperature sensor at the water outlet of the radiator has no fault and the duration time of the demand output which is greater than or equal to the first output threshold reaches a first time threshold, taking the water outlet temperature starting from the duration time as a first initial temperature, acquiring the water outlet temperature as a first judgment temperature, and judging the fault of the cooling water pump until the difference value between the first initial temperature and the first judgment temperature is less than the first temperature threshold.
A third aspect of the present application provides an electronic device for cooling water pump diagnosis, comprising a processor and a memory, wherein the processor executes code in the memory to implement the method.
The beneficial effect that technical scheme that this application provided brought includes:
according to the cooling water pump diagnosis method, the cooling water pump diagnosis device and the electronic equipment, after the diagnosis entry condition of the cooling water pump is met, the required output of the cooling water pump is obtained, when the temperature sensor at the water outlet of the radiator is free of faults and the duration time of the required output which is greater than or equal to a first output threshold reaches a first time threshold, the water outlet temperature starting from the duration time is used as a first initial temperature, the water outlet temperature is obtained as a first judgment temperature, and the fault of the cooling water pump is judged until the difference value between the first initial temperature and the first judgment temperature is smaller than the first temperature threshold; otherwise, judging that the cooling water pump has no fault; therefore, the working state of the cooling water pump can be timely and accurately judged, unnecessary energy consumption waste of the fan when the cooling water pump breaks down is avoided, meanwhile, an additional diagnosis interface does not need to be added to the cooling water pump, occupation of pin resources of the controller is reduced, and cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a first flowchart of a cooling water pump diagnosis method according to an embodiment of the present application.
FIG. 2 is a schematic view of a cooling system of an electric machine according to an embodiment of the present application;
fig. 3 is a second flowchart of a cooling water pump diagnosis method according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the application provides a cooling water pump diagnosis method, which can solve the problems of high complexity and high use cost of a cooling water pump in the related art.
The cooling water pump diagnosis method is used for diagnosing the cooling water pump of the motor. In this embodiment, motor, radiator and cooling water pump connect gradually and form cooling circulation circuit, and radiator delivery port department still is equipped with temperature sensor. The radiator is also provided with a fan for realizing air diversion.
As shown in fig. 1, the method for diagnosing a cooling water pump of the present embodiment specifically includes the following steps:
s1, obtaining the demand output of the cooling water pump after the diagnosis entering condition of the cooling water pump is met.
S2, when the temperature sensor at the water outlet of the radiator is not in fault and the duration time of the demand output which is greater than or equal to the first output threshold reaches a first time threshold, the water outlet temperature starting from the duration time is used as a first initial temperature, the water outlet temperature is obtained and used as a first judgment temperature, and the fault of the cooling water pump is judged until the difference value between the first initial temperature and the first judgment temperature is smaller than the first temperature threshold.
And if the difference value between the first initial temperature and the first judgment temperature is greater than or equal to a first temperature threshold value, judging that the cooling water pump has no fault.
According to the cooling water pump diagnosis method, after the diagnosis entry condition of the cooling water pump is met, the required output of the cooling water pump is obtained, when the temperature sensor at the water outlet of the radiator is free of faults and the duration time of the required output, which is greater than or equal to the first output threshold value, reaches the first time threshold value, the water outlet temperature starting from the duration time is used as the first initial temperature, the water outlet temperature is obtained as the first judgment temperature, and the fault of the cooling water pump is judged until the difference value between the first initial temperature and the first judgment temperature is smaller than the first temperature threshold value; otherwise, judging that the cooling water pump has no fault; therefore, the working state of the cooling water pump can be timely and accurately judged, unnecessary energy consumption waste of the fan when the cooling water pump breaks down is avoided, meanwhile, an additional diagnosis interface does not need to be added to the cooling water pump, occupation of pin resources of the controller is reduced, and cost is reduced.
As shown in fig. 2, an all-in-one controller and a motor controller are further connected between the cooling water pump and the motor to form a motor cooling system. In this embodiment, the radiator is further connected with a liquid replenishing tank, and a liquid level sensor is arranged in the liquid replenishing tank. The cooling liquid passes through the cooling water pump, the all-in-one controller, the motor controller and the motor in sequence from the water outlet of the radiator and then returns to the radiator through the water inlet of the radiator.
As shown in fig. 3, in this embodiment, the method further includes:
and S3, when the temperature sensor at the water outlet of the radiator has a fault and the duration of the required output of the cooling water pump which is greater than or equal to the first output threshold reaches a second time threshold, taking the motor temperature, the motor controller temperature and the all-in-one controller temperature which begin from the duration as a second initial temperature, a third initial temperature and a fourth initial temperature respectively. That is, the motor temperature at the start of the duration is set as the second initial temperature, the motor controller temperature at the start of the duration is set as the third initial temperature, and the all-in-one controller temperature at the start of the duration is set as the fourth initial temperature.
And S4, obtaining the motor temperature, the motor controller temperature and the all-in-one controller temperature as a second judgment temperature, a third judgment temperature and a fourth judgment temperature respectively, and judging the fault of the cooling water pump until the difference value between the second initial temperature and the second judgment temperature is smaller than a second temperature threshold, the difference value between the third initial temperature and the third judgment temperature is smaller than a third temperature threshold, and the difference value between the fourth initial temperature and the fourth judgment temperature is smaller than a fourth temperature threshold.
And if the difference value between the second initial temperature and the second judgment temperature is not less than the second temperature threshold, or the difference value between the third initial temperature and the third judgment temperature is not less than the third temperature threshold, or the difference value between the fourth initial temperature and the fourth judgment temperature is not less than the fourth temperature threshold, judging that the cooling water pump has no fault.
The diagnosis method of the embodiment judges whether the cooling water pump works abnormally based on the temperature signal of the motor cooling system; when the required output of the cooling water pump is greater than or equal to a first output threshold value, if the temperature sensor at the water outlet of the radiator has no fault, judging whether the cooling water pump has a fault according to the water outlet temperature detected by the water outlet temperature sensor; if the temperature sensor at the water outlet of the radiator has a fault, judging whether the cooling water pump has the fault according to the motor temperature, the motor controller temperature and the temperature of the all-in-one controller.
Further, before obtaining the motor temperature, the motor controller temperature, and the all-in-one controller temperature as the second determination temperature, the third determination temperature, and the fourth determination temperature, the method further includes the following steps:
firstly, prestoring a corresponding table of the minimum value of the required reduction of the ambient temperature, the vehicle speed and the motor temperature;
secondly, prestoring a corresponding table of the ambient temperature, the vehicle speed and the minimum value required to be reduced by the temperature of the motor controller;
then, prestoring a corresponding table of the ambient temperature, the vehicle speed and the minimum value required to be reduced by the temperature of the all-in-one controller;
and finally, acquiring the ambient temperature and the vehicle speed, respectively looking up the table, acquiring the minimum value required to be reduced by the motor temperature as a second temperature threshold value, acquiring the minimum value required to be reduced by the motor controller temperature as a third temperature threshold value, and acquiring the minimum value required to be reduced by the all-in-one controller temperature as a fourth temperature threshold value. Namely, the second temperature threshold is the minimum value of the required reduction of the motor temperature under the current environment temperature and the vehicle speed; the third temperature threshold value is the minimum value of the temperature required to be reduced of the motor controller under the current environment temperature and the vehicle speed; the fourth temperature threshold is the minimum value of the temperature required to be reduced of the all-in-one controller under the current ambient temperature and the vehicle speed.
On the basis of the above embodiment, in this embodiment, after obtaining the required output of the cooling water pump, the method further includes the following steps:
first, a time is counted from when the required output of the cooling water pump is greater than or equal to a first output threshold.
And then, when the temperature sensor at the water outlet of the radiator has no fault, if the timing time does not reach the first time threshold value, the required output is smaller than the first output threshold value, namely the duration time of the required output which is larger than or equal to the first output threshold value does not reach the first time threshold value, the timing is ended, and whether the diagnosis entering condition of the cooling water pump is met or not is judged again.
Optionally, when the timing time reaches a first time threshold, the water outlet temperature at which timing starts is taken as a first initial temperature TcooltAfter the timing time reaches a first time threshold value, only the first initial temperature T is required to be setcooltAnd comparing the temperature with the currently acquired water outlet temperature.
Further, when the temperature sensor at the water outlet of the radiator has a fault, if the timing time does not reach the second time threshold, the required output is smaller than the first output threshold, namely the duration time of the required output which is larger than or equal to the first output threshold does not reach the second time threshold, the timing is ended, and whether the diagnosis entering condition of the cooling water pump is met is judged again.
Optionally, when the timing time reaches a second time threshold, the temperature of the motor at the beginning of timing is taken as a second initial temperature TMotThe motor temperature at the beginning of the timing is used as the third initial temperature TMcuThe motor temperature at the beginning of the timing is used as the fourth initial temperature TPDU. After the timing time reaches a second time threshold, only the second initial temperature T is required to be setMotA third initial temperature TMcuFourth initial temperature TPDURespectively comparing the current motor temperature, the motor controller temperature and the all-in-one controller temperature one by one.
In addition, no matter whether the temperature sensor at the water outlet of the radiator is in fault or not, when the diagnosis entering condition of the cooling water pump is met and the diagnosis is started, the diagnosis is ended when the required output of the cooling water pump is smaller than the first output threshold value, and whether the diagnosis entering condition of the cooling water pump is met or not needs to be judged again.
Preferably, the first time threshold is greater than the second time threshold. Alternatively, the first time threshold may be set according to the time required for the coolant temperature to change significantly under normal conditions; the second time threshold can be set according to the motor temperature under normal conditions, the motor controller temperature and the time required for the three-in-one controller temperature to change significantly, and the time required for the cooling liquid temperature to change significantly is obviously longer than the time required for the motor temperature, the motor controller temperature and the three-in-one controller temperature to change significantly.
On the basis of the foregoing embodiment, in this embodiment, before acquiring the water outlet temperature as the first determination temperature in the step S2, the method further includes the following steps:
firstly, prestoring a corresponding table of the minimum value required to be reduced between the ambient temperature and the temperature of the water outlet of the radiator;
then, the ambient temperature is obtained, and the minimum value of the required drop of the temperature of the water outlet of the radiator is obtained as the first temperature threshold value based on the look-up table of the ambient temperature. That is, the first temperature threshold is the minimum value of the required drop in the coolant temperature at the current ambient temperature.
Preferably, after the step S2 of determining that the cooling water pump is faulty, the method further includes the following steps:
firstly, continuously acquiring a first judgment temperature, and calculating a difference value between the first initial temperature and the first judgment temperature.
And then, when the difference value between the first initial temperature and the first judgment temperature is larger than a first temperature threshold value, judging that the fault of the cooling water pump is cleared.
In other embodiments, a third time threshold may also be set, and the third time threshold is less than the first time threshold, or much less than the first time threshold. And if the duration that the difference value between the first initial temperature and the first judgment temperature is greater than the first temperature threshold reaches a third time threshold, judging that the fault of the cooling water pump is cleared, and further ensuring that the fault of the cooling water pump is cleared.
Correspondingly, after the temperature sensor at the water outlet of the radiator fails, the method for judging the failure of the cooling water pump further comprises the following steps:
firstly, continuously acquiring a second judgment temperature, a third judgment temperature and a fourth judgment temperature, and calculating a difference value between the second initial temperature and the second judgment temperature, a difference value between the third initial temperature and the third judgment temperature and a difference value between the fourth initial temperature and the fourth judgment temperature.
And then, when the difference value between the second initial temperature and the second judgment temperature is greater than a second temperature threshold value, or the difference value between the third initial temperature and the third judgment temperature is greater than a third temperature threshold value, or the difference value between the fourth initial temperature and the fourth judgment temperature is greater than a fourth temperature threshold value, judging that the fault of the cooling water pump is cleared.
In this embodiment, the diagnostic entry condition is a first entry condition or a second entry condition, and the diagnosis of the cooling water pump may be performed when either one of the first entry condition or the second entry condition is satisfied.
The first entry condition includes:
receiving a refrigeration signal; namely, the motor cooling system receives a refrigeration signal and needs refrigeration;
the cooling water pump has no electrical fault and the required output is greater than or equal to a first output threshold;
the temperature sensor has no fault and the temperature of the water outlet is greater than a fifth temperature threshold value, or the temperature sensor has a fault, and the output is 1 when the fault occurs;
the fan at the radiator has no fault and the output duty ratio is greater than a second output threshold value;
the liquid level of a liquid level sensor of a liquid supplementing tank of the radiator is higher than a liquid level threshold value.
Preferably, the first output threshold is set according to specifications of the cooling water pump. In this embodiment, the output duty ratio is used for judgment, when the cooling water pump has no electrical fault and the duty ratio output is greater than or equal to 23%, the water pump will work, and the first output threshold value at this time can be set to 23%.
In another embodiment, if the cooling water pump is a switch-type water pump, 0 indicates no output, 1 indicates output, and the cooling water pump is operated when there is no electrical fault and the required output is equal to 1, and is used as one of the first entry conditions for diagnosis.
Optionally, the fifth temperature threshold is used for diagnosing and judging the starting condition of the cooling water pump, and may be obtained by looking up a table according to the current ambient temperature. In this embodiment, the fifth temperature threshold is a minimum value of the temperature required to be detected by the temperature sensor at the current ambient temperature, so as to determine that the cooling water pump needs to be started for diagnosis.
Alternatively, the second output threshold may be set according to specifications of the radiator and the fan.
In this embodiment, the liquid level threshold value can be set according to the technical specification of fluid infusion case.
The second entry condition is:
and the fault diagnosis forced start switch of the cooling water pump is set to be 1.
The embodiment of the application also provides a cooling water pump diagnosis device based on the method, and the cooling water pump diagnosis device comprises a first judgment module, an acquisition module, a second judgment module and a diagnosis module.
The first judgment module is used for judging whether the diagnosis entering condition of the cooling water pump is met.
The acquisition module is used for acquiring the required output of the cooling water pump when the diagnosis entering condition of the cooling water pump is met.
The second judging module is used for judging whether the temperature sensor has faults or not.
The diagnosis module is used for judging the fault of the cooling water pump when the temperature sensor at the water outlet of the radiator has no fault and the duration time of the demand output which is greater than or equal to the first output threshold reaches the first time threshold, taking the water outlet temperature starting from the duration time as the first initial temperature, acquiring the water outlet temperature as the first judgment temperature, and judging the fault of the cooling water pump until the difference value between the first initial temperature and the first judgment temperature is smaller than the first temperature threshold.
Further, the diagnosis module is further configured to, when the temperature sensor has a fault and the duration that the required output is greater than or equal to the first output threshold reaches a second time threshold, take the motor temperature, the motor controller temperature, and the all-in-one controller temperature that start with the duration as a second initial temperature, a third initial temperature, and a fourth initial temperature, respectively; and acquiring the motor temperature, the motor controller temperature and the all-in-one controller temperature as a second judgment temperature, a third judgment temperature and a fourth judgment temperature respectively, and judging the fault of the cooling water pump until the difference value between the second initial temperature and the second judgment temperature is smaller than a second temperature threshold value, the difference value between the third initial temperature and the third judgment temperature is smaller than a third temperature threshold value, and the difference value between the fourth initial temperature and the fourth judgment temperature is smaller than a fourth temperature threshold value.
The cooling water pump diagnosis device of this embodiment is applicable to above-mentioned each cooling water pump diagnosis method, and all can diagnose when the temperature sensor of radiator delivery port department has the trouble, and need not additionally to increase cooling water pump's diagnosis physical interface, can effectively judge whether cooling water pump normally works, and increased the diagnosis rationality, still can inform the motor regulation in advance to protection motor and motor controller.
The embodiment of the application further provides an electronic device for diagnosing the cooling water pump, wherein the electronic device comprises a processor and a memory, and the processor executes codes in the memory to realize the following cooling water pump diagnosis method:
when the diagnosis entry condition of the cooling water pump is met, acquiring the required output of the cooling water pump;
starting timing when the required output of the cooling water pump is greater than or equal to a first output threshold value;
if the temperature sensor at the water outlet of the radiator has no fault, the water outlet temperature at the beginning of timing is taken as a first initial temperature, the water outlet temperature is obtained as a first judgment temperature after the timing time reaches a first time threshold, and the fault of the cooling water pump is judged when the difference value between the first initial temperature and the first judgment temperature is smaller than the first temperature threshold.
Optionally, the processor executing the code in the memory may further implement a cooling water pump diagnostic method as follows:
if the temperature sensor at the water outlet of the radiator has a fault, taking the motor temperature, the motor controller temperature and the all-in-one controller temperature which are counted at the beginning as a second initial temperature, a third initial temperature and a fourth initial temperature respectively;
and when the timing time reaches a second time threshold, acquiring the motor temperature, the motor controller temperature and the all-in-one controller temperature as a second judgment temperature, a third judgment temperature and a fourth judgment temperature respectively, and judging the fault of the cooling water pump when the difference value of the second initial temperature and the second judgment temperature is smaller than the second temperature threshold, the difference value of the third initial temperature and the third judgment temperature is smaller than the third temperature threshold, and the difference value of the fourth initial temperature and the fourth judgment temperature is smaller than the fourth temperature threshold.
Preferably, the processor executing the code in the memory may also implement other steps in the cooling water pump diagnostic method.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are 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 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present application and are presented to enable those skilled in the art to understand and practice the present application. 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 application. Thus, the present application 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. A cooling water pump diagnosis method is used for diagnosing a cooling water pump of a motor, and the motor, a radiator and the cooling water pump are sequentially connected to form a cooling circulation loop, and is characterized by comprising the following steps:
obtaining the required output of the cooling water pump after the diagnostic entry condition of the cooling water pump is met;
when the temperature sensor at the water outlet of the radiator is not in fault and the duration time of the demand output which is greater than or equal to the first output threshold reaches the first time threshold, the water outlet temperature starting from the duration time is used as the first initial temperature, the water outlet temperature is obtained and used as the first judgment temperature, and the fault of the cooling water pump is judged until the difference value between the first initial temperature and the first judgment temperature is smaller than the first temperature threshold.
2. The cooling water pump diagnostic method according to claim 1, wherein an all-in-one controller and a motor controller are further connected between the cooling water pump and the motor;
when the temperature sensor at the water outlet of the radiator has a fault and the duration time of the required output which is greater than or equal to the first output threshold reaches a second time threshold, the motor temperature, the motor controller temperature and the all-in-one controller temperature which begin with the duration time are respectively used as a second initial temperature, a third initial temperature and a fourth initial temperature;
and obtaining the motor temperature, the motor controller temperature and the all-in-one controller temperature as a second judgment temperature, a third judgment temperature and a fourth judgment temperature respectively, and judging the fault of the cooling water pump until the difference value between the second initial temperature and the second judgment temperature is smaller than a second temperature threshold, the difference value between the third initial temperature and the third judgment temperature is smaller than a third temperature threshold, and the difference value between the fourth initial temperature and the fourth judgment temperature is smaller than a fourth temperature threshold.
3. The cooling water pump diagnostic method according to claim 2, wherein before obtaining the second determination temperature, the third determination temperature, and the fourth determination temperature, further comprising:
prestoring a corresponding table of the minimum value of the required reduction of the ambient temperature, the vehicle speed and the motor temperature;
prestoring a corresponding table of the minimum value of the environmental temperature, the vehicle speed and the temperature required to be reduced of the motor controller;
prestoring a corresponding table of the ambient temperature, the vehicle speed and the minimum value required to be reduced by the temperature of the all-in-one controller;
and acquiring the ambient temperature and the vehicle speed, respectively looking up a table, acquiring the minimum value required to be reduced by the motor temperature as a second temperature threshold value, acquiring the minimum value required to be reduced by the motor controller temperature as a third temperature threshold value, and acquiring the minimum value required to be reduced by the all-in-one controller temperature as a fourth temperature threshold value.
4. The cooling water pump diagnostic method according to claim 1, further comprising, after obtaining the demand output of the cooling water pump:
starting timing when the required output of the cooling water pump is greater than or equal to a first output threshold value;
and if the timing time does not reach the first time threshold value, the required output is smaller than the first output threshold value, and the timing is finished.
5. The cooling water pump diagnostic method according to claim 2, characterized in that: the first time threshold is greater than a second time threshold.
6. The cooling water pump diagnostic method according to claim 1, before obtaining the water outlet temperature as the first judgment temperature, further comprising:
prestoring a corresponding table of the minimum value of the required reduction of the ambient temperature and the temperature of the water outlet of the radiator;
and acquiring the ambient temperature, and acquiring the minimum value required to be reduced by the temperature of the water outlet of the radiator as the first temperature threshold value based on the table look-up of the ambient temperature.
7. The cooling water pump diagnostic method according to claim 1, further comprising, after determining that the cooling water pump is malfunctioning:
continuously acquiring a first judgment temperature;
and when the difference value between the first initial temperature and the first judgment temperature is greater than a first temperature threshold value, judging that the fault of the cooling water pump is cleared.
8. The cooling water pump diagnostic method of claim 1, wherein the diagnostic entry condition is a first entry condition or a second entry condition;
the first entry condition includes:
receiving a refrigeration signal;
the cooling water pump has no electrical fault and the required output is greater than or equal to a first output threshold;
the temperature sensor is not in fault, the temperature of the water outlet is greater than a fifth temperature threshold value, or the temperature sensor is in fault;
the fan at the radiator has no fault and the output duty ratio is greater than a second output threshold value;
the liquid level of a liquid level sensor of a liquid supplementing tank of the radiator is higher than a liquid level threshold value;
the second entry condition is:
and the fault diagnosis forced start switch of the cooling water pump is set to be 1.
9. A cooling water pump diagnostic apparatus based on the method of claim 1, characterized by comprising:
the first judgment module is used for judging whether the diagnosis entering condition of the cooling water pump is met or not;
an acquisition module for acquiring a demand output of the cooling water pump when a diagnostic entry condition of the cooling water pump is satisfied;
the second judgment module is used for judging whether the temperature sensor fails or not;
and the diagnosis module is used for judging the fault of the cooling water pump when the temperature sensor at the water outlet of the radiator has no fault and the duration time of the demand output which is greater than or equal to the first output threshold reaches a first time threshold, taking the water outlet temperature starting from the duration time as a first initial temperature, acquiring the water outlet temperature as a first judgment temperature, and judging the fault of the cooling water pump until the difference value between the first initial temperature and the first judgment temperature is less than the first temperature threshold.
10. An electronic device for cooling water pump diagnostics, comprising a processor and a memory, the processor executing code in the memory implementing the method of any of claims 1 to 8.
CN202110997756.8A 2021-08-27 2021-08-27 Cooling water pump diagnosis method and device and electronic equipment Active CN113606125B (en)

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