CN115389053A - 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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- 238000003745 diagnosis Methods 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000001816 cooling Methods 0.000 title claims abstract description 54
- 239000000110 cooling liquid Substances 0.000 claims abstract description 53
- 239000002826 coolant Substances 0.000 claims description 32
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- 239000000446 fuel Substances 0.000 description 2
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- 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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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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- G—PHYSICS
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- 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
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Abstract
The invention provides a reliability diagnosis method and a reliability diagnosis device for a temperature sensor of a motor cooling system, wherein the method comprises the following steps: determining a diagnostic operating condition of the vehicle, the diagnostic operating condition including at least one of: starting diagnosis working conditions, constant speed diagnosis working conditions and stopping diagnosis working conditions; acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature which are acquired by a temperature sensor; judging whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets a preset condition 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 reliability fault exists in the temperature sensor. The invention solves the problems of complex model and huge calibration workload in the method for judging whether the temperature value acquired by the temperature sensor is credible in the prior art.
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
At present, the petroleum resources are gradually in shortage, and in the face of increasingly strict fuel consumption regulations, the cost of reducing the fuel consumption of a vehicle driven by a traditional pure internal combustion engine is higher and higher, and the difficulty is higher and higher; the pure electric vehicle can achieve zero emission, and the cost of pure electric drive electric power is far lower than that of a vehicle driven by an internal combustion engine, so that the pure electric vehicle is more and more favored by consumers in recent years.
For the current electric drive vehicle, the driving motor is mostly a permanent magnet synchronous motor, the permanent magnet is sensitive to temperature, and the permanent magnet can be demagnetized when working in a high-temperature environment for a long time, so that the performance of the motor is reduced, and the energy consumption of the vehicle is increased. Therefore, the electric automobile is generally provided with a motor and motor inverter cooling system, heat generated when the motor and the inverter work is taken away through circulation of cooling liquid, and the heat of the cooling liquid is dissipated through windward of the automobile; the present complexity that is limited by cost and cooling system, electric automobile's motor and dc-to-ac converter cooling system are mostly water cooling system, and be equipped with circulating water pump, simultaneously in order to calculate the aperture of water pump, the temperature at each position of cooling system needs to gather, like motor temperature, motor inverter temperature, motor entrance coolant temperature etc., therefore the temperature that whether temperature sensor can correctly gather each part is the key that cooling system can effectively work, present fault detection to temperature sensor is mostly open a way and short-circuit detection, the skew that takes place normal range to the sensor characteristic detects, present mostly calculate the temperature value that temperature sensor gathered the point through the temperature model, then judge whether credible with the temperature value of calculating value and actual value comparison temperature value that temperature sensor gathered, but this kind of method often faces the problem that the model is complicated and the demarcation work load is huge, the real-time degree of difficulty is higher.
Disclosure of Invention
The invention mainly aims to provide a reliability diagnosis method and a reliability diagnosis device for a temperature sensor of a motor cooling system, and aims to solve the problems of complex model and huge calibration workload in the prior art for judging whether the temperature value acquired by the temperature sensor is reliable.
In order to achieve the above object, according to an aspect of the present invention, there is provided a reliability diagnosis method of a temperature sensor of a motor cooling system, including: determining a diagnostic operating condition of the vehicle, the diagnostic operating condition including at least one of: starting diagnosis working conditions, constant speed diagnosis working conditions and stopping diagnosis working conditions; acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature which are acquired by a temperature sensor; judging whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets a preset condition 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 reliability fault exists in the temperature sensor.
Optionally, determining the diagnostic operating condition of the vehicle comprises: judging whether the vehicle is in a whole vehicle power-on state or not; if yes, acquiring a first deviation value delta T between the temperature of a volute of the engine turbocharger and the ambient temperature 1 (ii) a Determining the first deviation value Delta T 1 Whether the temperature is lower than a first preset temperature or not; if yes, the diagnosis working condition is determined as a starting diagnosis working condition.
Optionally, determining the diagnostic operating condition of the vehicle comprises: 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 constant-speed 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 operating condition of the vehicle comprises: judging whether the vehicle is in a shutdown state or not; if so, acquiring the continuous running time and the highest speed of the vehicle before the vehicle is stopped; judging whether the continuous operation time exceeds a preset time or not and whether the maximum vehicle speed is greater than a preset vehicle speed or not; 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 condition as a shutdown diagnosis 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 temperature of the motor, the temperature of the motor inverter and the temperature of the cooling liquid to obtain a comparison result; judging whether the comparison result meets a preset condition, wherein the preset condition comprises the following steps: 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: calculating a second deviation value delta T between the motor temperature and the motor inverter temperature under the condition that the diagnosis working condition is determined to be a starting diagnosis working condition and/or under the condition that the diagnosis working condition is determined to be a stopping diagnosis working condition 2 A third deviation value delta T of the temperature of the motor and the temperature of the cooling liquid 3 A fourth deviation value delta T of the temperature of the motor inverter and the temperature of the cooling liquid 4 (ii) a Judging the second deviation value delta T 2 The third deviation value delta T 3 And a fourth deviation value DeltaT 4 Whether the absolute value of any one of the values satisfies a preset condition; at the second deviation value DeltaT 2 The third deviation value delta T 3 And a fourth deviation value DeltaT 4 And determining that the temperature sensor has reliability fault when the absolute value of any one of the temperature sensors does not meet the preset condition.
According to another aspect of the embodiments of the present invention, there is provided a reliability diagnosis device of a temperature sensor of a motor cooling system, including: a first determination unit that determines a diagnostic condition of the vehicle, the diagnostic condition including at least one of: starting diagnosis working conditions, constant speed diagnosis working conditions and stopping diagnosis working conditions; the acquisition unit is used for acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature which are 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 a preset condition or not based on different diagnosis working conditions; and a second determination unit that determines that there is a reliability failure in the temperature sensor 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, the motor inverter is provided with an inverter temperature sensor, and a pipeline between the electronic water pump and the motor inverter is provided with a cooling liquid temperature sensor; 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 the motor is provided with a motor temperature sensor; the reliability of the cooling liquid temperature sensor, the reliability of the inverter temperature sensor and the reliability of the motor temperature sensor are diagnosed by the reliability diagnosis method of the temperature sensor of the motor cooling system.
According to another aspect of the embodiments of the present invention, a processor for executing a program is provided, wherein the program executes the above-mentioned reliability diagnosis method for the temperature sensor of the motor cooling system.
According to another aspect of the embodiment of the invention, a vehicle is provided, which comprises an electric motor cooling system, wherein the electric motor cooling system is the electric motor cooling system.
By applying the technical scheme of the invention, the diagnosis working conditions of the vehicle are determined, wherein the diagnosis working conditions comprise a start-up diagnosis working condition, a constant speed diagnosis working condition and a stop diagnosis working condition, then the motor temperature, the motor inverter temperature and the cooling liquid temperature which are acquired by the temperature sensor are acquired, whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets the preset condition or not is judged based on different diagnosis working conditions, and the reliability fault of the temperature sensor is determined under the condition that the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature of the temperature sensor does not meet the preset condition. The reliability diagnosis method for the temperature sensors of the motor cooling system is easy to implement and can easily screen the temperature sensors with reliability faults, so that the technical effect of identifying whether the temperature sensors among the plurality of temperature sensors of the motor cooling system are abnormal in advance is achieved, and the problems that a method for judging whether the temperature values acquired by the temperature sensors are reliable in the prior art is complex in model and large in calibration workload are solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiment(s) of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 shows a schematic flow diagram of a first exemplary embodiment of a method for diagnosing the plausibility of a temperature sensor of an electric machine cooling system according to the invention;
fig. 2 shows a schematic flow diagram of a second exemplary embodiment of a method for plausibility diagnosis of a temperature sensor of a motor cooling system according to the invention;
fig. 3 shows a schematic flow diagram of a third exemplary embodiment of a method for diagnosing the plausibility of a temperature sensor of a motor cooling system according to the invention;
fig. 4 shows a schematic flow chart of a fourth embodiment of a method for diagnosing the plausibility of a temperature sensor of a motor cooling system according to the present invention;
fig. 5 shows a schematic flow diagram of a fifth exemplary embodiment of a method for diagnosing the plausibility of a temperature sensor of an electric machine cooling system according to the invention;
fig. 6 shows a schematic flow chart of a sixth exemplary embodiment of a method for diagnosing the plausibility of a temperature sensor of a motor cooling system according to the present invention;
fig. 7 shows a schematic flow chart of a seventh embodiment of a method for diagnosing the plausibility of a temperature sensor of a motor cooling system according to the present invention;
fig. 8 is a block diagram showing the configuration of an embodiment of the reliability diagnosing apparatus of the temperature sensor of the motor cooling system according to the present invention;
fig. 9 shows a schematic structural diagram of an embodiment of the motor cooling system according to the invention.
Wherein the 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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
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 example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements 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 only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description 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 a motor cooling system, wherein the steps illustrated in the flowchart of the figure may be performed in a computer system, such as a set of computer-executable instructions, and wherein, although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different than presented 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 working condition of the vehicle, wherein the diagnosis working condition comprises at least one of the following conditions: starting diagnosis working conditions, constant speed diagnosis working conditions and stopping diagnosis working conditions;
step S102, acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature which are 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 a preset condition or not based on different diagnosis working conditions;
and step S104, determining that the reliability fault exists in the temperature sensor 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 diagnosis condition of the vehicle, the diagnosis condition includes a start-up diagnosis condition, a constant speed diagnosis condition and a stop diagnosis condition, and then obtains the motor temperature, the motor inverter temperature and the coolant temperature collected by the temperature sensor, based on different diagnosis conditions, it is determined whether the temperature relationship among the motor temperature, the motor inverter temperature and the coolant temperature satisfies the preset condition, and it is determined that the reliability fault exists in the temperature sensor when it is determined 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 for the temperature sensors of the motor cooling system is easy to implement and can easily screen the temperature sensors with reliability faults, so that the technical effect of identifying whether the temperature sensors among the plurality of temperature sensors of the motor cooling system are abnormal in advance is achieved, and the problems that a method for judging whether the temperature values acquired by the temperature sensors are reliable in the prior art is complex in model and large in calibration workload are solved. Wherein, under different diagnosis working conditions, the preset conditions are different.
Alternatively, as shown in FIG. 2, determining the diagnostic operating condition of the vehicle includes:
step S201, judging whether the vehicle is in a whole vehicle power-on state;
step S202, if yes, acquiring a first deviation value delta T between the temperature of a volute of an engine turbocharger and the ambient temperature 1 ；
Step S203, determining the first deviation value Delta T 1 Whether the temperature is lower than a first preset temperature or not;
in this step, the first preset temperature is 5 ℃.
And step S204, if yes, determining the diagnosis working condition as a starting diagnosis working condition.
Specifically, if the first deviation value delta T of the temperature of the volute of the engine turbocharger and the ambient temperature is detected when the whole vehicle is powered on 1 Satisfies Δ T 1 The whole vehicle is considered to be stationary for a long time and is determined at the temperature of less than 5 DEG CThe diagnosis working condition is a starting diagnosis working condition.
Optionally, as shown in fig. 3, determining the diagnostic operating condition of the vehicle further comprises:
step S301, acquiring the speed of the vehicle;
step S302, judging whether the vehicle speed meets a first preset condition;
in this step, the first preset condition is that the vehicle speed is more than 50km/h and less than 70km/h.
Step S303, if yes, judging whether the vehicle is in a constant speed running state;
and step S304, determining the diagnosis working condition to be a constant speed diagnosis working condition under the condition that the vehicle is in a constant speed running state.
Through the steps, the accurate judgment of the constant speed diagnosis working condition is realized.
Optionally, as shown in fig. 4, determining the diagnostic operating condition of the vehicle further comprises:
step S401, judging whether the vehicle is in a stop state;
step S402, if yes, acquiring the continuous running time and the highest speed of the vehicle before the vehicle is stopped;
step S403, judging whether the continuous operation time exceeds the preset time and whether the maximum 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, the average power of the driving motor in the running process of the vehicle before the vehicle stops is obtained;
step S405, judging whether the average power is larger than a preset power;
in this step, the preset power is set to 10kw.
And step S406, if so, determining the diagnosis working condition as a 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, comparing the temperature of the motor, the temperature of the inverter of the motor and the temperature of the cooling liquid to obtain a comparison result under the condition that the diagnosis working condition is determined to be a constant speed diagnosis working condition;
step S502, judging whether the comparison result meets preset conditions, 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 step S503, determining that the temperature sensor has reliability fault under the condition that the comparison result does not meet the preset condition.
In this embodiment, under the constant speed diagnosis condition, the preset condition is that the motor temperature is greater than or equal to the motor inverter temperature and greater than or equal to the coolant temperature. Specifically, because at the at uniform velocity diagnosis operating mode, calorific capacity of motor is greater than motor inverter, therefore the motor temperature is greater than motor inverter temperature, simultaneously because the coolant temperature reduces after the radiator heat dissipation, therefore the temperature relation between these three is: if the temperature relation acquired by the three temperature sensors is not the relation, the reliability fault of the temperature sensor is considered to occur.
Optionally, as shown in fig. 6, the method further includes:
step S601, under the condition that the diagnosis working condition is determined to be a starting diagnosis working condition and/or under the condition that the diagnosis working condition is determined to be a stopping diagnosis working condition, calculating a second deviation value delta T between the motor temperature and the motor inverter temperature 2 A third deviation value delta T of the temperature of the motor and the temperature of the cooling liquid 3 A fourth deviation value delta T of the temperature of the motor inverter and the temperature of the cooling liquid 4 ；
Step S602, determining the second deviation value Δ T 2 The third deviation value delta T 3 And a fourth deviation value DeltaT 4 Whether the absolute value of any one of the values meets a preset condition or not;
step S603, in the second deviation value delta T 2 The third deviation value delta T 3 And a fourth deviation value DeltaT 4 And determining that the temperature sensor has reliability fault when the absolute value of any one of the temperature sensors does not meet the preset condition.
In the present embodiment, in the case where the diagnosis operation condition is the start-up diagnosis operation condition or the stop diagnosis operation conditionThe preset conditions are as follows: | Δ T 2 |≤2℃、|ΔT 3 ≤2℃、|ΔT 4 The absolute value is less than or equal to 2 ℃. If the second deviation value Δ T 2 The third deviation value delta T 3 And a fourth deviation value DeltaT 4 If the absolute value of any one of the temperature sensors is greater than 2 ℃, the temperature sensor is considered to have reliability failure. Therefore, whether the sensors among the temperature sensors on the motor cooling system are abnormal or not can be identified in advance, and the abnormal temperature sensors can be screened accurately.
As shown in fig. 7, which is a flowchart illustrating a seventh embodiment of the reliability diagnosis method for a temperature sensor of a motor cooling system according to the present application, first, it is determined whether a vehicle meets a start-up diagnosis operating condition, and if so, the reliability diagnosis for the temperature sensor under the start-up diagnosis operating condition is performed. Specifically, since the vehicle has been standing for a long time, the temperatures of the respective components should be consistent, and if the absolute value of the deviation between 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 a reliability failure occurs in the temperature sensor. And if the vehicle does not meet the starting diagnosis working condition, judging whether the vehicle meets the constant speed diagnosis working condition, and specifically, if the vehicle speed is between 50km/h and 70km/h and the vehicle is in a constant speed driving state, the constant speed diagnosis working condition is met. The method for judging whether the vehicle is in the constant-speed running state comprises the following steps: and filtering two average values of 5 second time period and 1 second time period of the opening degree of the accelerator pedal of the vehicle, and if the absolute value of the deviation of the filtered result of the average value of the 1 second time period and the filtered result of the average value of the 5 second time period is not less than 2% of the opening degree, the accelerator pedal is considered to be in a stable state. And filtering two average values of the vehicle speed for a time period of 5 seconds and a time period of 2 seconds, and if the absolute value of the deviation of the result of filtering the average value for the time period of 2 seconds from the vehicle speed of the result of filtering the average value for the time period of 5 seconds is not less than 2km/h, the vehicle speed is considered to be in a stable state. And when the accelerator pedal and the vehicle speed are in a stable state, the vehicle is considered to be in a constant-speed running state. The accelerator pedal opening is defined as 0% when the driver does not step on the accelerator pedal, and 100% when the driver completely steps on the accelerator pedal. And when the fact that the vehicle meets the condition of the constant speed diagnosis working condition is determined, diagnosing the reliability of the temperature sensor under the condition of the constant speed diagnosis working condition. Set for motor cooling system's water pump rotational speed for the highest rotational speed, with the right side and the left side interface UNICOM of three-way valve, judge whether the relation between coolant temperature sensor, motor temperature sensor, the motor inverter temperature sensor three satisfies: if the temperature relation acquired by the three temperature sensors is not the relation, the reliability fault of the temperature sensor is considered to occur. And if the vehicle does not meet the starting diagnosis working condition and the uniform speed diagnosis working condition, judging whether the vehicle meets the stopping diagnosis working condition, specifically, when the vehicle stops, if the driving working condition of the whole vehicle before the vehicle stops meets a certain condition, the stopping diagnosis working condition is met. The driving working conditions of the whole vehicle before shutdown are as follows: the vehicle is continuously operated for more than 30 minutes before the shutdown, the maximum speed of the whole vehicle exceeds 60km/h, and the average power of the vehicle during the running process exceeds 10kw. The average power calculation method in the vehicle running process includes taking absolute values of the power of the driving motor, accumulating the absolute values of the power of the driving motor, and comparing the accumulated power values with accumulated duration to obtain the average power of the driving motor. And when the shutdown diagnosis working condition is met, diagnosing the credibility of the temperature sensor after shutdown. After the whole vehicle stops, the driving motor and the driving motor inverter do not work any more, therefore, 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 between the cooling liquid temperature sensor, the motor temperature sensor and the motor inverter temperature sensor is judged, after 5 minutes of delay, because the cooling liquid does not pass through a radiator for heat dissipation, after circulation of the water pump for a certain time, the motor and the motor inverter are fully cooled, the motor temperature and the motor inverter temperature tend to be consistent with the temperature of the cooling liquid, if the absolute value of deviation of any two temperature values of the collected motor temperature, the motor inverter temperature and the cooling liquid temperature exceeds 2 ℃, the temperature sensor is considered to have reliability fault. And when the motor cooling loop temperature sensor is diagnosed to have reliability fault under any one of the three working conditions, storing a relevant fault code and reminding a driver to maintain the vehicle. The difference of the temperature sensor reliability diagnosis after the whole vehicle is powered on and the whole vehicle is shut down is that: the whole vehicle is diagnosed after being electrified, the whole vehicle is in a long-time standing state, and the temperature of each part tends to the ambient temperature, so that the whole vehicle belongs to the low-temperature category. The diagnosis after the shutdown is the diagnosis after the whole vehicle runs for a long time, the temperature of each component is in a higher value and belongs to the high-temperature range, and the reliability diagnosis is carried out on the sensor in the low-temperature range and the high-temperature range through the two working conditions, 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 for a temperature sensor of a motor cooling system, as shown in fig. 8, the reliability diagnosis device for a temperature sensor of a motor cooling system includes a first determination unit 41, an acquisition unit 42, a judgment unit 43, and a second determination unit 44, the first determination unit 41 is configured to determine a diagnosis condition of a vehicle, and the diagnosis condition includes at least one of: a start-up diagnosis working condition, a constant speed diagnosis working condition and a stop diagnosis working condition. The acquisition unit 42 is configured to acquire the motor temperature, the motor inverter temperature, and the coolant temperature acquired by the temperature sensor. The determination unit 43 then determines 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. The second determination unit 44 is configured to determine that there is a reliability failure in the temperature sensor 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 diagnosis condition of the vehicle, the diagnosis condition includes a start-up diagnosis condition, a constant speed diagnosis condition and a stop diagnosis condition, and then obtains the motor temperature, the motor inverter temperature and the coolant temperature collected by the temperature sensor, based on different diagnosis conditions, it is determined whether the temperature relationship among the motor temperature, the motor inverter temperature and the coolant temperature satisfies the preset condition, and it is determined that the reliability fault exists in the temperature sensor when it is determined 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 for the temperature sensors of the motor cooling system is easy to implement and easy to screen the temperature sensors with reliability faults, so that the technical effect of identifying whether the temperature sensors among the plurality of temperature sensors of the motor cooling system are abnormal in advance is achieved, and the problems that in the prior art, a model is complex and the calibration workload is huge in a method for judging whether the temperature values acquired by the temperature sensors are reliable 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, electronic water pump 3, motor inverter 5 and motor 6. The first interface of three-way valve 2 communicates with the outlet end of radiator 1, the coolant inlet end of electronic water pump 3 communicates with the second interface of three-way valve 2, it is provided with expansion tank 9 to be located on the pipeline between three-way valve 2 and electronic water pump 3, the coolant inlet end of inverter 5 communicates with the coolant outlet end of electronic water pump 3, be provided with dc-to-ac converter temperature sensor 7 on the inverter 5, and be located and be provided with coolant temperature sensor 4 on the pipeline between electronic water pump 3 and inverter 5, the coolant inlet end of motor 6 communicates with the coolant outlet end of inverter 5, the coolant outlet end of motor 6 communicates with the third interface of three-way valve 2 and the inlet end of radiator 1, be provided with motor temperature sensor 8 on the 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 and right side interfaces of the three-way valve 2 are communicated, after the electronic water pump 3 rotates, the coolant 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 coolant, the heat in the coolant is taken away by the vehicle intake windward through the radiator 1, and the low-temperature coolant returns to the motor inverter 5 and the motor 6 again, and the process is repeated. When the lower part 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 the 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 collects the temperature inside the motor inverter 5, and the motor temperature sensor 8 collects the temperature inside the motor 6. And determining whether the electronic water pump 3 needs to be started for cooling according to the temperature of the motor inverter 5 and the temperature of the motor 6, and calculating the rotating speed of the electronic water pump 3 according to the temperature relationship 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, a processor for running a program is provided, where the program when running performs the method for diagnosing the reliability 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 the motor cooling system described above.
For ease of description, spatially relative terms such as "above … …", "above … …", "above … … upper surface", "above", etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition to the foregoing, it should be appreciated that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same 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 submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A reliability diagnosis method for a temperature sensor of a motor cooling system, comprising:
determining a diagnostic operating condition of the vehicle, the diagnostic operating condition comprising at least one of: starting diagnosis working conditions, constant speed diagnosis working conditions and stopping diagnosis working conditions;
acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature which are acquired by a temperature sensor;
judging whether the temperature relation among the motor temperature, the motor inverter temperature and the cooling liquid temperature meets a preset condition 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 reliability fault exists in the temperature sensor.
2. The method of claim 1, wherein determining the diagnostic operating condition of the vehicle comprises:
judging whether the vehicle is in a whole vehicle power-on state or not;
if yes, acquiring a first deviation value delta T between the temperature of a volute of a turbocharger of the engine and the ambient temperature 1 ；
Judging the first deviation value delta T 1 Whether the temperature is lower than a first preset temperature or not;
and if so, determining the diagnosis working condition as the starting diagnosis working condition.
3. The method of claim 1, wherein determining a diagnostic operating 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 constant-speed running state;
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 the diagnostic operating condition of the vehicle comprises:
judging whether the vehicle is in a shutdown state or not;
if so, acquiring the continuous running time and the highest speed of the vehicle before the vehicle is stopped;
judging whether the continuous operation time exceeds a preset time or not and whether the maximum vehicle speed is greater than a preset vehicle speed or not;
if so, acquiring the average power of a 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. The method of claim 3, further comprising:
under the condition that the diagnosis working condition is determined to be 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 motor temperature is more than or equal to the motor inverter temperature is more than or equal to the cooling liquid temperature;
and under the condition that the comparison result does not meet the preset condition, determining that the reliability fault exists in the temperature sensor.
6. The method according to claim 2 or 4, characterized in that 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 between the motor temperature and the motor inverter temperature 2 A third deviation value delta T between the motor temperature and the cooling liquid temperature 3 A fourth deviation value delta T between the temperature of the motor inverter and the temperature of the cooling liquid 4 ；
Judging the second deviation value delta T 2 The third deviation value delta T 3 And said fourth deviation value Δ T 4 Whether the absolute value of any one of the values satisfies the preset condition;
at the second deviation value DeltaT 2 The third deviation value Delta T 3 And said fourth deviation value Δ T 4 And determining that the reliability fault exists in the temperature sensor under the condition that the absolute value of any one of the temperature sensors does not meet the preset condition.
7. An apparatus for diagnosing reliability of a temperature sensor of a motor cooling system, comprising:
a first determination unit that determines a diagnostic condition of the vehicle, the diagnostic condition including at least one of: a starting diagnosis working condition, a constant speed diagnosis working condition and a stopping diagnosis working condition;
the acquisition unit is used for acquiring the motor temperature, the motor inverter temperature and the cooling liquid temperature which are 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 determination unit that determines that there is a reliability failure in the temperature sensor 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.
8. An electric machine cooling system, characterized by comprising:
a heat sink (1);
a 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 cooling liquid inlet end of the motor inverter (5) is communicated with the cooling liquid outlet end of the electronic water pump (3), an inverter temperature sensor (7) is arranged on the motor inverter (5), and a cooling liquid temperature sensor (4) is arranged on a pipeline between the electronic water pump (3) and the motor inverter (5);
a cooling liquid inlet end of the motor (6) is communicated with a cooling liquid outlet end of the motor inverter (5), a cooling liquid outlet end of the motor (6) is communicated with a third interface of the three-way valve (2) and an 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 using the reliability diagnosis method of the temperature sensor of the motor cooling system according to any one of claims 1 to 6.
9. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the method for diagnosing the reliability of the temperature sensor of the motor cooling system according to any one of claims 1 to 6.
10. A vehicle comprising an electric machine cooling system as recited in claim 8.
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