CN115389053B - Reliability diagnosis method and device for temperature sensor of motor cooling system - Google Patents
Reliability diagnosis method and device for temperature sensor of motor cooling system Download PDFInfo
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- CN115389053B CN115389053B CN202210999348.0A CN202210999348A CN115389053B CN 115389053 B CN115389053 B CN 115389053B CN 202210999348 A CN202210999348 A CN 202210999348A CN 115389053 B CN115389053 B CN 115389053B
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 127
- 238000001816 cooling Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 52
- 239000000110 cooling liquid Substances 0.000 claims abstract description 56
- 239000002826 coolant Substances 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 238000010586 diagram Methods 0.000 description 8
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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Abstract
The invention provides a reliability diagnosis method and a device for a temperature sensor of a motor cooling system, wherein the method comprises the following steps: determining a diagnostic condition of the vehicle, the diagnostic condition including at least one of: a start-up diagnosis working condition, a constant-speed diagnosis working condition and a shutdown diagnosis working condition; acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature acquired by a temperature sensor; judging whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets preset conditions or not based on different diagnosis working conditions; and under the condition that the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature does not meet the preset condition, determining that the temperature sensor has reliability fault. The method solves the problems of complex model and huge calibration workload in the prior art in the method for judging whether the temperature value acquired by the temperature sensor is credible.
Description
Technical Field
The invention relates to the technical field of electric automobile cooling systems, in particular to a reliability diagnosis method and device for a temperature sensor of a motor cooling system.
Background
Today, the shortage of petroleum resources is growing, and the cost and difficulty of the traditional pure internal combustion engine driven vehicles are higher and higher in reducing the fuel consumption facing the stricter fuel consumption regulations; the electric vehicle can achieve zero emission, and the electric cost of the electric vehicle is far lower than that of the vehicle driven by the internal combustion engine, so that the electric vehicle is popular with consumers in recent years.
For the current electric drive vehicle, most of driving motors are permanent magnet synchronous motors, the permanent magnets are sensitive to temperature, and the permanent magnets can be demagnetized after long-term working in a high-temperature environment, so that the motor performance is reduced, and the energy consumption of the vehicle is increased. Therefore, the electric automobile is commonly provided with a motor and a motor inverter cooling system, heat generated during the operation of the motor and the inverter is taken away through the circulation of cooling liquid, and the heat of the cooling liquid is dissipated through windward of the automobile; the method is characterized in that the current cost and the complexity of a cooling system are limited, the motor and an inverter cooling system of the electric automobile are mostly water-cooling systems and are provided with circulating water pumps, meanwhile, in order to calculate the opening of the water pumps, the temperatures of all parts of the cooling system, such as the motor temperature, the motor inverter temperature and the motor inlet cooling liquid temperature, are required to be collected, so that whether a temperature sensor can accurately collect the temperatures of all parts is a key that the cooling system can effectively work, the current fault detection of the temperature sensor is mainly open circuit and short circuit detection, the normal range offset detection of the sensor characteristic is mainly carried out, the calculated temperature value of the temperature sensor collecting point is calculated through a temperature model, and then the calculated value is compared with an actual value to judge whether the temperature value collected by the temperature sensor is reliable or not.
Disclosure of Invention
The invention mainly aims to provide a reliability diagnosis method and device for a temperature sensor of a motor cooling system, which are used for solving the problems of complex model and huge calibration workload in the prior art of judging whether the temperature value acquired by the temperature sensor is reliable or not.
In order to achieve the above object, according to one aspect of the present invention, there is provided a reliability diagnosis method of a temperature sensor of a motor cooling system, comprising: determining a diagnostic condition of the vehicle, the diagnostic condition including at least one of: a start-up diagnosis working condition, a constant-speed diagnosis working condition and a shutdown diagnosis working condition; acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature acquired by a temperature sensor; judging whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets preset conditions or not based on different diagnosis working conditions; and under the condition that the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature does not meet the preset condition, determining that the temperature sensor has reliability fault.
Optionally, determining the diagnostic condition of the vehicle includes: judging whether the vehicle is in a whole vehicle power-on state or not; if so, obtaining a first deviation value delta T 1 between the temperature of a volute of the engine turbocharger and the ambient temperature; judging whether the first deviation value delta T 1 is smaller than a first preset temperature or not; if so, determining the diagnosis working condition as the starting diagnosis working condition.
Optionally, determining the diagnostic condition of the vehicle includes: acquiring the speed of a vehicle; judging whether the vehicle speed meets a first preset condition or not; if so, judging whether the vehicle is in a uniform running state; and under the condition that the vehicle is in a constant-speed running state, determining the diagnosis working condition as a constant-speed diagnosis working condition.
Optionally, determining the diagnostic condition of the vehicle includes: judging whether the vehicle is in a stop state or not; if so, acquiring continuous running time and highest vehicle speed before the vehicle is stopped; judging whether the continuous running time exceeds the preset time and whether the highest vehicle speed is greater than the preset vehicle speed; if so, acquiring the average power of the driving motor in the running process of the vehicle before the vehicle stops; judging whether the average power is larger than a preset power or not; if so, determining the diagnosis working condition as a shutdown diagnosis working condition.
Optionally, the method further comprises: under the condition that the diagnosis working condition is determined to be a constant-speed diagnosis working condition, comparing the motor temperature, the motor inverter temperature and the cooling liquid temperature to obtain a comparison result; judging whether the comparison result meets preset conditions or not, wherein the preset conditions comprise: the temperature of the motor is more than or equal to that of the motor inverter and more than or equal to that of the cooling liquid; and under the condition that the comparison result does not meet the preset condition, determining that the temperature sensor has reliability fault.
Optionally, the method further comprises: under the condition that the diagnosis working condition is determined to be the starting diagnosis working condition and/or under the condition that the diagnosis working condition is determined to be the stopping diagnosis working condition, calculating a second deviation value delta T 2 of the motor temperature and the motor inverter temperature, a third deviation value delta T 3 of the motor temperature and the cooling liquid temperature and a fourth deviation value delta T 4 of the motor inverter temperature and the cooling liquid temperature; judging whether the absolute value of any one of the second deviation value delta T 2, the third deviation value delta T 3 and the fourth deviation value delta T 4 meets a preset condition; in the case where the absolute value of any one of the second deviation value Δt 2, the third deviation value Δt 3, and the fourth deviation value Δt 4 does not satisfy the preset condition, it is determined that the temperature sensor has a reliability failure.
According to another aspect of the embodiment of the present invention, there is provided a reliability diagnosis apparatus of a temperature sensor of a motor cooling system, including: the first determining unit determines a diagnosis condition of the vehicle, the diagnosis condition including at least one of: a start-up diagnosis working condition, a constant-speed diagnosis working condition and a shutdown diagnosis working condition; the acquisition unit acquires the motor temperature, the motor inverter temperature and the cooling liquid temperature acquired by the temperature sensor; the judging unit is used for judging whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets preset conditions or not based on different diagnosis working conditions; and a second determining unit that determines that the temperature sensor has a reliability failure in a case where a temperature relationship among the motor temperature, the motor inverter temperature, and the coolant temperature does not satisfy a preset condition.
According to another aspect of an embodiment of the present invention, there is provided a motor cooling system including: a heat sink; the first interface of the three-way valve is communicated with the outlet end of the radiator; the cooling liquid inlet end of the electronic water pump is communicated with the second interface of the three-way valve, and an expansion water tank is arranged on a pipeline between the three-way valve and the electronic water pump; the cooling liquid inlet end of the motor inverter is communicated with the cooling liquid outlet end of the electronic water pump, an inverter temperature sensor is arranged on the motor inverter, and a cooling liquid temperature sensor is arranged on a pipeline between the electronic water pump and the motor inverter; the cooling liquid inlet end of the motor is communicated with the cooling liquid outlet end of the motor inverter, the cooling liquid outlet end of the motor is communicated with the third interface of the three-way valve and the inlet end of the radiator, and a motor temperature sensor is arranged on the motor; the reliability of the cooling liquid temperature sensor, the inverter temperature sensor and the motor temperature sensor is diagnosed by adopting the reliability diagnosis method of the temperature sensor of the motor cooling system.
According to another aspect of the embodiments of the present invention, there is provided a processor for running a program, wherein the program runs to perform the above-described reliability diagnosis method for the temperature sensor of the motor cooling system.
According to another aspect of an embodiment of the present invention, there is provided a vehicle including a motor cooling system, the motor cooling system being the motor cooling system described above.
By means of the technical scheme, through determining the diagnosis working conditions of the vehicle, the diagnosis working conditions comprise a start-up diagnosis working condition, a constant-speed diagnosis working condition and a shutdown diagnosis working condition, then the motor temperature, the motor inverter temperature and the cooling liquid temperature acquired by the temperature sensor are acquired, whether the temperature relationship among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets preset conditions is judged based on different diagnosis working conditions, and under the condition that the temperature relationship among the motor temperature, the motor inverter temperature and the cooling liquid temperature does not meet the preset conditions, reliability faults of the temperature sensor are determined. The reliability diagnosis method of the temperature sensor of the motor cooling system is easy to implement and screen, so that the technical effect of identifying whether the temperature sensor among the temperature sensors of the motor cooling system is abnormal in advance is achieved, and the problems of complex model and huge calibration workload in the method for judging whether the temperature value acquired by the temperature sensor is reliable in the prior art are solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 shows a flow diagram of a first embodiment of a method of reliability diagnosis of a temperature sensor of a motor cooling system according to the present invention;
FIG. 2 shows a flow diagram of a second embodiment of a method of reliability diagnosis of a temperature sensor of a motor cooling system according to the invention;
FIG. 3 shows a flow diagram of a third embodiment of a method of reliability diagnosis of a temperature sensor of a motor cooling system according to the present invention;
FIG. 4 shows a flow diagram of a fourth embodiment of a method of reliability diagnosis of a temperature sensor of a motor cooling system according to the present invention;
FIG. 5 shows a flow diagram of a fifth embodiment of a method of reliability diagnosis of a temperature sensor of a motor cooling system according to the present invention;
FIG. 6 shows a flow diagram of a sixth embodiment of a method of reliability diagnosis of a temperature sensor of a motor cooling system according to the present invention;
FIG. 7 shows a flow diagram of a seventh embodiment of a method of reliability diagnosis of a temperature sensor of a motor cooling system according to the present invention;
FIG. 8 shows a block diagram of an embodiment of a reliability diagnostic device of a temperature sensor of a motor cooling system according to the present invention;
Fig. 9 shows a schematic structural view of an embodiment of a motor cooling system according to the present invention.
Wherein the above figures include the following reference numerals:
1. A heat sink; 2. a three-way valve; 3. an electronic water pump; 4. a coolant temperature sensor; 5. a motor inverter; 6. a motor; 7. an inverter temperature sensor; 8. a motor temperature sensor; 9. an expansion tank.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.
In accordance with an embodiment of the present invention, there is provided a method embodiment of a method for diagnosing the trustworthiness of a temperature sensor of an electric motor cooling system, it being noted that the steps illustrated in the flow chart of the drawings may be performed in a computer system such as a set of computer executable instructions, and, although a logical sequence is illustrated in the flow chart, in some cases, the steps illustrated or described may be performed in a different order than that herein.
As shown in fig. 1, which is a flowchart of a first embodiment of a control method of a rotational speed of an engine of a hybrid vehicle according to the present application, as shown in fig. 1, a reliability diagnosis method of a temperature sensor of a motor cooling system includes the steps of:
Step S101, determining a diagnosis condition of the vehicle, where the diagnosis condition includes at least one of: a start-up diagnosis working condition, a constant-speed diagnosis working condition and a shutdown diagnosis working condition;
step S102, acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature acquired by a temperature sensor;
Step S103, judging whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets preset conditions or not based on different diagnosis working conditions;
Step S104, determining that the temperature sensor has reliability fault under the condition that the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature does not meet the preset condition.
In this embodiment, by determining the diagnostic conditions of the vehicle, the diagnostic conditions include a start-up diagnostic condition, a constant-speed diagnostic condition, and a shutdown diagnostic condition, and then acquiring the motor temperature, the motor inverter temperature, and the coolant temperature acquired by the temperature sensor, determining whether the temperature relationship among the motor temperature, the motor inverter temperature, and the coolant temperature satisfies a preset condition based on different diagnostic conditions, and determining that the temperature sensor has a reliability fault under the condition that the temperature relationship among the motor temperature, the motor inverter temperature, and the coolant temperature does not satisfy the preset condition. The reliability diagnosis method of the temperature sensor of the motor cooling system is easy to implement and screen, so that the technical effect of identifying whether the temperature sensor among the temperature sensors of the motor cooling system is abnormal in advance is achieved, and the problems of complex model and huge calibration workload in the method for judging whether the temperature value acquired by the temperature sensor is reliable in the prior art are solved. Under different diagnosis working conditions, preset conditions are different.
Optionally, as shown in fig. 2, determining the diagnostic conditions of the vehicle includes:
step S201, judging whether the vehicle is in a whole vehicle power-on state;
Step S202, if yes, obtaining a first deviation value delta T 1 between the temperature of a volute of the engine turbocharger and the ambient temperature;
Step S203, judging whether the first deviation value DeltaT 1 is smaller than a first preset temperature;
in this step, the first preset temperature is 5 ℃.
Step S204, if yes, determining the diagnosis working condition as the start-up diagnosis working condition.
Specifically, when the whole vehicle is electrified, if a first deviation value delta T 1 between the temperature of a volute of the engine turbocharger and the ambient temperature meets delta T 1 < 5 ℃, the whole vehicle is considered to be stationary for a long time, and the diagnosis working condition is determined to be an engine starting diagnosis working condition.
Optionally, as shown in fig. 3, determining the diagnostic condition of the vehicle further includes:
step S301, acquiring the speed of a vehicle;
step S302, judging whether the vehicle speed meets a first preset condition or not;
in this step, the first preset condition is that the vehicle speed is greater than 50km/h and less than 70km/h.
Step S303, if yes, judging whether the vehicle is in a uniform speed running state;
Step S304, under the condition that the vehicle is in a constant speed running state, determining the diagnosis working condition as a constant speed diagnosis working condition.
Through the steps, accurate judgment of uniform-speed diagnosis working conditions is achieved.
Optionally, as shown in fig. 4, determining the diagnostic condition of the vehicle further includes:
step S401, judging whether the vehicle is in a stop state or not;
step S402, if yes, acquiring continuous running time and highest vehicle speed before the vehicle is stopped;
Step S403, judging whether the continuous running time exceeds the preset time and the highest vehicle speed is greater than the preset vehicle speed;
In this step, the preset time is set to 30 minutes and the preset vehicle speed is set to 60km/h.
Step S404, if yes, obtaining the average power of the driving motor in the running process of the vehicle before the vehicle stops;
step S405, judging whether the average power is larger than a preset power;
in this step, the preset power is set to 10kw.
Step S406, if yes, determining the diagnosis working condition as the shutdown diagnosis working condition.
Through the steps, the accurate judgment of the shutdown diagnosis working condition is realized.
Optionally, as shown in fig. 5, the method further includes:
Step S501, under the condition that the diagnosis working condition is determined to be a constant-speed diagnosis working condition, comparing the motor temperature, the motor inverter temperature and the cooling liquid temperature to obtain a comparison result;
Step S502, judging whether the comparison result meets the preset conditions, where the preset conditions include: the temperature of the motor is more than or equal to that of the motor inverter and more than or equal to that of the cooling liquid;
in step S503, if the comparison result does not meet the preset condition, it is determined that the temperature sensor has a reliability fault.
In the embodiment, under the constant-speed diagnosis working condition, the preset condition is that the temperature of the motor is more than or equal to the temperature of the motor inverter is more than or equal to the temperature of the cooling liquid. Specifically, under the constant-speed diagnosis working condition, the heating value of the motor is larger than that of the motor inverter, so that the temperature of the motor is larger than that of the motor inverter, and meanwhile, the temperature of the cooling liquid is reduced after heat dissipation of the radiator, so that the temperature relationship among the three is as follows: if the temperature relation acquired by the three temperature sensors is not the above relation, the reliability fault of the temperature sensors is considered to occur.
Optionally, as shown in fig. 6, the method further includes:
Step S601, under the condition that the diagnosis condition is determined to be the start-up diagnosis condition, and/or under the condition that the diagnosis condition is determined to be the stop diagnosis condition, calculating a second deviation value Δt 2 of the motor temperature and the motor inverter temperature, a third deviation value Δt 3 of the motor temperature and the coolant temperature, and a fourth deviation value Δt 4 of the motor inverter temperature and the coolant temperature;
Step S602, determining whether the absolute value of any one of the second deviation value Δt 2, the third deviation value Δt 3 and the fourth deviation value Δt 4 meets a preset condition;
In step S603, in the case where the absolute value of any one of the second deviation value Δt 2, the third deviation value Δt 3, and the fourth deviation value Δt 4 does not satisfy the preset condition, it is determined that the temperature sensor has a reliability failure.
In this embodiment, when the diagnosis condition is a start-up diagnosis condition or a shutdown diagnosis condition, the preset conditions are: and the temperature of the T 2|≤2℃、|ΔT3≤2℃、|ΔT4 is less than or equal to 2 ℃. If the absolute value of any one of the second, third and fourth deviation values Δt 2, Δt 3, Δt 4 is greater than 2 ℃, it is considered that the temperature sensor has a reliability failure. Therefore, whether the abnormality occurs among the plurality of temperature sensors on the motor cooling system can be recognized in advance, and the abnormal temperature sensor can be accurately screened.
Fig. 7 is a flowchart of a seventh embodiment of a reliability diagnosis method for a temperature sensor of a motor cooling system according to the present application, wherein it is first determined whether a vehicle meets a start-up diagnosis condition, and if so, reliability diagnosis for the temperature sensor under the start-up diagnosis condition is performed. Specifically, since the vehicle has been left standing for a long time, the temperatures of the respective components should be uniform in area, and if the absolute value of the deviation of any two temperature values of the motor temperature, the motor inverter temperature, and the coolant temperature collected at this time exceeds 2 ℃, it is considered that there is a reliability failure of the temperature sensor. If the vehicle does not meet the starting diagnosis working condition, judging whether the vehicle meets the constant speed diagnosis working condition, specifically, if the vehicle speed is between 50km/h and 70km/h and the vehicle is in a constant speed running state, the constant speed diagnosis working condition is met. The method for judging the vehicle in the uniform running state comprises the following steps: the vehicle accelerator pedal opening is subjected to two average value filtering for a 5 second period and a 1 second period, and if the absolute value of the deviation of the opening from the average value filtering result for the 1 second period is not less than 2% of the opening, the accelerator pedal is considered to be in a steady state. And performing two average value filtering for the vehicle speed for 5 seconds and 2 seconds, and if the absolute value of the deviation of the average value filtering result for 2 seconds from the vehicle speed for 5 seconds is not less than 2km/h, then the vehicle speed is considered to be in a stable state. When the accelerator pedal and the vehicle speed are both in a stable state, the vehicle is considered to be in a constant-speed running state. Wherein the accelerator pedal opening is defined as 0% when the driver does not step on the accelerator pedal, and 100% when the driver fully steps on the accelerator pedal. And after the vehicle is determined to meet the constant-speed diagnosis working condition, performing reliability diagnosis of the temperature sensor under the constant-speed diagnosis working condition. Setting the rotation speed of a water pump of a motor cooling system to be the highest rotation speed, connecting the right side and the left side of a three-way valve with a port of the left side, and judging whether the relation among a cooling liquid temperature sensor, a motor temperature sensor and a motor inverter temperature sensor is satisfied: if the temperature relation acquired by the three temperature sensors is not the above relation, the reliability fault of the temperature sensors is considered to occur. If the vehicle does not meet the start-up diagnosis working condition and the uniform speed diagnosis working condition, judging whether the vehicle meets the stop diagnosis working condition, specifically, if the driving working condition of the whole vehicle before stopping meets a certain condition when the vehicle stops, the stop diagnosis working condition is met. The driving working condition of the whole vehicle before stopping is as follows: the vehicle is continuously operated for more than 30 minutes before stopping, the highest speed of the whole vehicle is more than 60km/h, and the average power during the running of the vehicle is more than 10kw. The average power calculation method in the running process of the vehicle comprises the steps of taking the absolute value of the power of the driving motor, accumulating the absolute value of the power of the driving motor, and comparing the accumulated power value with the accumulated duration time to obtain the average power of the driving motor. And when the shutdown diagnosis working condition is met, performing reliability diagnosis on the temperature sensor after shutdown. After the whole vehicle is stopped, the driving motor and the driving motor inverter are not operated any more, so that heat is not generated any more, the rotating speed of the water pump is set to be the highest rotating speed, the right side of the three-way valve is communicated with the lower interface, the relation among the cooling liquid temperature sensor, the motor temperature sensor and the motor inverter temperature sensor is judged, after the delay of 5 minutes, the cooling liquid does not radiate through the radiator, after the circulation of the water pump for a certain time, the motor and the motor inverter are fully cooled, the temperature of the motor and the temperature of the motor inverter tend to be consistent with the temperature of the cooling liquid, if the absolute value of the deviation of any two temperature values of the collected motor temperature, the motor inverter temperature and the cooling liquid temperature exceeds 2 ℃, then a temperature sensor is considered to have a plausibility failure. And after diagnosing that the reliability fault exists in the temperature sensor of the motor cooling circuit under any one of the three working conditions, storing relevant fault codes and reminding a driver of maintaining the vehicle. The difference of the reliability diagnosis of the temperature sensor after the whole vehicle is electrified and the whole vehicle is stopped is that: the diagnosis after the whole vehicle is electrified is that the whole vehicle is kept for a long time, and the temperature of each part tends to the ambient temperature and belongs to the low-temperature category. The diagnosis after the shutdown is performed after the whole vehicle runs for a long time, the temperature of each part is in a higher value and belongs to the high Wen Fanchou, and through the two working conditions, the reliability diagnosis is performed on the sensor in a low-temperature zone and a high-temperature zone, so that the temperature coverage range of the diagnosis is wider.
According to another embodiment of the present application, there is provided a reliability diagnosis device of a temperature sensor of a motor cooling system, as shown in fig. 8, the reliability diagnosis device of the temperature sensor of the motor cooling system including a first determination unit 41, an acquisition unit 42, a judgment unit 43, and a second determination unit 44, the first determination unit 41 being configured to determine a diagnosis condition of a vehicle, the diagnosis condition including at least one of: the method comprises the steps of starting a machine to diagnose working conditions, diagnosing working conditions at a constant speed and diagnosing working conditions at a shutdown. The acquisition unit 42 is used for acquiring the motor temperature, the motor inverter temperature and the coolant temperature acquired by the temperature sensor. The judging unit 43 judges whether the temperature relationship among the motor temperature, the motor inverter temperature and the coolant temperature satisfies the preset condition based on different diagnosis conditions. The second determining unit 44 is configured to determine that the temperature sensor has a reliability failure in a case where a temperature relationship among the motor temperature, the motor inverter temperature, and the coolant temperature does not satisfy a preset condition.
In this embodiment, by determining the diagnostic conditions of the vehicle, the diagnostic conditions include a start-up diagnostic condition, a constant-speed diagnostic condition, and a shutdown diagnostic condition, and then acquiring the motor temperature, the motor inverter temperature, and the coolant temperature acquired by the temperature sensor, determining whether the temperature relationship among the motor temperature, the motor inverter temperature, and the coolant temperature satisfies a preset condition based on different diagnostic conditions, and determining that the temperature sensor has a reliability fault under the condition that the temperature relationship among the motor temperature, the motor inverter temperature, and the coolant temperature does not satisfy the preset condition. The reliability diagnosis method of the temperature sensor of the motor cooling system is easy to implement and screen, so that the technical effect of identifying whether the temperature sensor among the temperature sensors of the motor cooling system is abnormal in advance is achieved, and the problems of complex model and huge calibration workload in the method for judging whether the temperature value acquired by the temperature sensor is reliable in the prior art are solved.
According to another embodiment of the present application, there is provided a motor cooling system, as shown in fig. 9, including: radiator 1, three-way valve 2, electron water pump 3, motor inverter 5 and motor 6. The first interface of three-way valve 2 communicates with the exit end of radiator 1, the coolant inlet end of electronic water pump 3 communicates with the second interface of three-way valve 2, be provided with expansion tank 9 on the pipeline between three-way valve 2 and electronic water pump 3, the coolant inlet end of motor inverter 5 communicates with the coolant outlet end of electronic water pump 3, be provided with inverter temperature sensor 7 on motor inverter 5, and be provided with coolant temperature sensor 4 on the pipeline between electronic water pump 3 and motor inverter 5, the coolant inlet end of motor 6 communicates with the coolant outlet end of motor inverter 5, the coolant outlet end of motor 6 communicates with the third interface of three-way valve 2 and the entrance end of radiator 1, be provided with motor temperature sensor 8 on motor 6. The reliability of the coolant temperature sensor 4, the inverter temperature sensor 7, and the motor temperature sensor 8 is diagnosed by the reliability diagnosis method of the temperature sensor of the motor cooling system in the above embodiment. In this embodiment, when the left side and the right side of the three-way valve 2 are connected to each other, after the electronic water pump 3 rotates, the cooling liquid circulates among the radiator 1, the motor inverter 5 and the motor 6, the heat generated by the motor inverter 5 and the motor 6 during operation is taken away by the cooling liquid, the heat in the cooling liquid is taken away by the vehicle air intake through the radiator 1, and the low-temperature cooling liquid returns to the motor inverter 5 and the motor 6 again, so that the operation is repeated. When the lower side of the three-way valve 2 is communicated with the right side interface, after the electronic water pump 3 rotates, the cooling liquid does not pass through the radiator 1 and only circulates between the motor inverter 5 and the motor 6, and heat generated when the motor inverter 5 and the motor 6 work is only transferred between the two parts. The coolant temperature sensor 4 collects the temperature of the coolant before entering the motor inverter 5, the inverter temperature sensor 7 is used for collecting the temperature inside the motor inverter 5, and the motor temperature sensor 8 is used for collecting the temperature inside the motor 6. And decides whether to start the electronic water pump 3 for cooling according to the temperature of the motor inverter 5 and the motor 6, and calculates the rotation speed of the electronic water pump 3 according to the temperature relation of the three sampling points so as to cool the temperatures of the motor inverter and the motor to reasonable values.
According to another specific embodiment of the present application, there is provided a processor for running a program, wherein the program runs to perform the reliability diagnosis method of the temperature sensor of the motor cooling system in the above embodiment.
According to another embodiment of the present application, there is provided a vehicle including a motor cooling system, the motor cooling system being the motor cooling system described above.
Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., indicate that the particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application, as generally described. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the application.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method of diagnosing reliability of a temperature sensor of a motor cooling system, comprising:
Determining a diagnostic condition of the vehicle, the diagnostic condition comprising at least one of: a start-up diagnosis working condition, a constant-speed diagnosis working condition and a shutdown diagnosis working condition;
acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature acquired by a temperature sensor;
Judging whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets preset conditions or not based on different diagnosis working conditions; under the condition that the diagnosis working condition is the constant-speed diagnosis working condition, comparing the motor temperature, the motor inverter temperature and the cooling liquid temperature to obtain a comparison result; judging whether the comparison result meets the preset conditions or not, wherein the preset conditions comprise: the temperature of the motor is more than or equal to that of the motor inverter is more than or equal to that of the cooling liquid; under the condition that the comparison result does not meet the preset condition, determining that the temperature sensor has reliability fault;
Calculating a second deviation value Δt 2 of the motor temperature and the motor inverter temperature, a third deviation value Δt 3 of the motor temperature and the coolant temperature, and a fourth deviation value Δt 4 of the motor inverter temperature and the coolant temperature when the diagnostic condition is determined to be the start-up diagnostic condition and/or when the diagnostic condition is determined to be the stop diagnostic condition; judging whether the absolute value of any one of the second deviation value delta T 2, the third deviation value delta T 3 and the fourth deviation value delta T 4 meets the preset condition; determining that the temperature sensor has the reliability fault when the absolute value of any one of the second deviation value Δt 2, the third deviation value Δt 3 and the fourth deviation value Δt 4 does not meet the preset condition;
and under the condition that the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature does not meet the preset condition, determining that the temperature sensor has the reliability fault.
2. The method of claim 1, wherein determining a diagnostic condition of the vehicle comprises:
Judging whether the vehicle is in a whole vehicle power-on state or not;
If so, obtaining a first deviation value delta T 1 between the temperature of a volute of the engine turbocharger and the ambient temperature;
Judging whether the first deviation value delta T 1 is smaller than a first preset temperature or not;
if yes, determining the diagnosis working condition as the starting diagnosis working condition.
3. The method of claim 1, wherein determining a diagnostic condition of the vehicle comprises:
Acquiring the speed of the vehicle;
judging whether the vehicle speed meets a first preset condition or not;
if so, judging whether the vehicle is in a uniform-speed running state or not;
And under the condition that the vehicle is in the constant-speed running state, determining the diagnosis working condition as the constant-speed diagnosis working condition.
4. The method of claim 1, wherein determining a diagnostic condition of the vehicle comprises:
Judging whether the vehicle is in a stop state or not;
if so, acquiring continuous running time and highest vehicle speed before stopping the vehicle;
judging whether the continuous running time exceeds a preset time and whether the highest vehicle speed is greater than a preset vehicle speed;
If yes, acquiring the average power of the driving motor in the running process of the vehicle before the vehicle stops;
judging whether the average power is larger than a preset power or not;
And if so, determining the diagnosis working condition as the shutdown diagnosis working condition.
5. A reliability diagnostic device of a temperature sensor of a motor cooling system, comprising:
The first determining unit determines a diagnostic condition of the vehicle, the diagnostic condition including at least one of: a start-up diagnosis working condition, a constant-speed diagnosis working condition and a shutdown diagnosis working condition;
the acquisition unit acquires the motor temperature, the motor inverter temperature and the cooling liquid temperature acquired by the temperature sensor;
The judging unit is used for judging whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets preset conditions or not based on different diagnosis working conditions;
Under the condition that the diagnosis working condition is the constant-speed diagnosis working condition, comparing the motor temperature, the motor inverter temperature and the cooling liquid temperature to obtain a comparison result; judging whether the comparison result meets the preset conditions or not, wherein the preset conditions comprise: the temperature of the motor is more than or equal to that of the motor inverter is more than or equal to that of the cooling liquid; under the condition that the comparison result does not meet the preset condition, determining that the temperature sensor has reliability fault;
Calculating a second deviation value Δt 2 of the motor temperature and the motor inverter temperature, a third deviation value Δt 3 of the motor temperature and the coolant temperature, and a fourth deviation value Δt 4 of the motor inverter temperature and the coolant temperature when the diagnostic condition is determined to be the start-up diagnostic condition and/or when the diagnostic condition is determined to be the stop diagnostic condition; judging whether the absolute value of any one of the second deviation value delta T 2, the third deviation value delta T 3 and the fourth deviation value delta T 4 meets the preset condition; determining that the temperature sensor has the reliability fault when the absolute value of any one of the second deviation value Δt 2, the third deviation value Δt 3 and the fourth deviation value Δt 4 does not meet the preset condition;
and a second determination unit that determines that the temperature sensor has the reliability failure in a case where a temperature relationship among the motor temperature, the motor inverter temperature, and the coolant temperature does not satisfy the preset condition.
6. An electric machine cooling system, the electric machine cooling system comprising:
a radiator (1);
The first interface of the three-way valve (2) is communicated with the outlet end of the radiator (1);
The cooling liquid inlet end of the electronic water pump (3) is communicated with the second interface of the three-way valve (2), and an expansion water tank (9) is arranged on a pipeline between the three-way valve (2) and the electronic water pump (3);
the motor inverter (5), the coolant inlet end of the motor inverter (5) is communicated with the coolant outlet end of the electronic water pump (3), an inverter temperature sensor (7) is arranged on the motor inverter (5), and a coolant temperature sensor (4) is arranged on a pipeline between the electronic water pump (3) and the motor inverter (5);
the cooling liquid inlet end of the motor (6) is communicated with the cooling liquid outlet end of the motor inverter (5), the cooling liquid outlet end of the motor (6) is communicated with the third interface of the three-way valve (2) and the inlet end of the radiator (1), and a motor temperature sensor (8) is arranged on the motor (6);
Wherein the reliability of the coolant temperature sensor (4), the inverter temperature sensor (7) and the motor temperature sensor (8) is diagnosed by the reliability diagnosis method of the temperature sensor of the motor cooling system according to any one of the above claims 1 to 4.
7. A processor for running a program, wherein the program when run performs the method of diagnosing the reliability of the temperature sensor of the motor cooling system according to any one of the preceding claims 1 to 4.
8. A vehicle comprising an electric machine cooling system, the electric machine cooling system being the electric machine cooling system of claim 6.
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