CN113135092B - Fault judgment method and device for vehicle and motor temperature sensor - Google Patents
Fault judgment method and device for vehicle and motor temperature sensor Download PDFInfo
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- CN113135092B CN113135092B CN202010054684.9A CN202010054684A CN113135092B CN 113135092 B CN113135092 B CN 113135092B CN 202010054684 A CN202010054684 A CN 202010054684A CN 113135092 B CN113135092 B CN 113135092B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0038—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to sensors
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Abstract
The invention relates to a fault judgment method and a device of a vehicle and a motor temperature sensor, wherein the judgment method comprises a first judgment step and a second judgment step, the first judgment step compares the motor temperature with a set temperature T1, the motor temperature is obtained by the motor temperature sensor, subsequent judgment is carried out under the condition that the T1 is less than the T1, the second judgment step is subsequent judgment, the second judgment step compares the temperature T2 of a motor controller with a set temperature T2, the temperature of the motor controller is obtained by the motor controller temperature sensor, and the judgment result of the second judgment step is needed when the motor temperature sensor fails: whether T2 is greater than T2. The invention takes the temperature of the motor controller as the criterion for the motor temperature sensor to have faults, and can improve the reliability of the fault judgment result of the motor temperature sensor.
Description
Technical Field
The invention relates to the technical field of motor equipment, in particular to a fault judgment method and device of a motor temperature sensor.
Background
The motor of the pure electric vehicle or the hybrid electric vehicle for providing the driving force determines the power level of the whole vehicle. But the motor needs to be constantly exposed to frequent momentary overloads and shocks. Therefore, various fault diagnoses are carried out in the running process of the motor, and corresponding protection strategies are adopted, so that the reliability of the motor can be improved. For example, a motor temperature sensor is arranged to monitor the temperature of the motor in real time during the operation of the motor, and corresponding cooling measures are executed when the temperature exceeds a limit, for example, a motor cooling system increases power to prevent the temperature from being too high during the operation of the motor.
However, because the motor as a power source is usually installed on a suspension system on a vehicle, the motor temperature sensor for detecting the temperature of the motor is directly installed on the motor or is installed on the suspension close to the position of the motor, in short, the motor temperature sensor has large shaking amplitude and frequency due to vehicle bumping in the driving process of the vehicle, and thus the fault condition that the wiring of the motor temperature sensor is disconnected or broken can be caused; under the condition that a temperature sensor does not correctly monitor the motor and a controller does a corresponding cooling control means, the motor can continuously heat up or even be at a high temperature in the long-time running process, and the safety of the whole vehicle is influenced. Therefore, it is necessary to determine the failure of the temperature sensor to avoid the above-mentioned situation.
However, the prior art has already appeared a technology for determining the fault of the temperature sensor, for example, in the chinese patent application publication No. CN105599700A, it relates to a method for detecting the fault of the temperature sensor of the electric machine, which outputs the fault based on the temperature of the coil of the motor being lower than the motor temperature threshold value and the transmission oil temperature being higher than the oil temperature threshold value. Although the method can judge the fault of the motor temperature sensor, the method avoids the misjudgment based on the oil temperature of the transmission device, when the vehicle is started in an extremely low temperature environment, the vehicle does not walk, the oil temperature of the transmission device can not be basically increased or the temperature increasing range is limited, and in the case, when the motor temperature sensor outputs a signal for representing low temperature, the fault of the temperature sensor can be judged mistakenly, namely the fault misjudgment is carried out.
Disclosure of Invention
The invention aims to provide a fault judgment method of a motor temperature sensor, which aims to reduce the problem of misjudgment of the motor temperature sensor in a high and cold environment; the invention also provides a fault judgment device of the motor temperature sensor, which is used for executing the fault judgment method of the motor temperature sensor and improving the reliability of the judgment; the invention also provides a vehicle, and the control device of the vehicle executes the fault judgment method of the motor temperature sensor so as to improve the working reliability of the vehicle.
In order to solve the above technical problem, a method for determining a fault of a motor temperature sensor is provided, which comprises the following steps:
judging one: comparing a motor temperature signal value a output by a motor temperature sensor with a first set threshold value A, wherein a and A respectively correspond to temperature values T1 and T1 sensed by the motor temperature sensor; judging whether the comparison of a and A reflects that T1 is smaller than T1;
under the condition that the T1 is not smaller than the T1, determining that the temperature sensor has no fault;
when the T1 is smaller than the T1, at least one subsequent judgment is carried out, when only one subsequent judgment is carried out and the judgment result is true, the motor temperature sensor is determined to be in fault, and when more than two subsequent judgments are carried out and the judgment results are true, the motor temperature sensor is determined to be in fault; when one of the judgment results of the subsequent judgments is false, determining that the temperature sensor does not have a fault;
the subsequent judgment comprises:
and II, judging: comparing a motor controller temperature signal value B output by a motor controller temperature sensor with a second set threshold value B, wherein the B and the B respectively correspond to motor controller temperature values T2 and T2, and judging whether the comparison of the B and the B reflects that the T2 is greater than the T2;
when the judgment result that T2 is not smaller than T2 is judged, the judgment result of the second judgment is true;
when the T2 is larger than the T2, judging that the judgment result of the second judgment is false;
the heat exchange part of the motor controller and the heat exchange part of the motor are connected with the same heat exchange system through pipelines, so that heat emitted by the motor and the motor controller is exchanged with heat exchange media in the heat exchange system.
The beneficial effects are that: according to the fault judgment method for the motor temperature sensor, the temperature detected by the motor controller temperature sensor is used as a supplementary judgment condition, and the heat exchange part of the motor controller and the heat exchange part of the motor are connected with the same heat exchange system through the pipeline, so that the motor controller and the motor can be heated together in the same heat exchange system when the motor runs, and the motor controller and the motor realize temperature association through the heat exchange system, thereby reducing the situation of misjudgment in a high-cold environment in the prior art and improving the reliability of a judgment result.
Optionally, the subsequent determination further includes a third determination: judging whether a is maintained in a set range within a set time; when the judgment result a is maintained in the set range within the set time, the judgment result of the third judgment is true; judging the judgment result of the third step is false under the condition that the a is not maintained in the set range within the set time; and the starting time of the set time of the third judgment is the time when the first judgment result is true.
Optionally, the subsequent determination further includes determining four: after judging that T2 is greater than T2, judging whether b is maintained within a set range within a set time; if the judgment result of b is maintained in the set range within the set time, judging the judgment result of the fourth step to be true; judging whether the judgment result of the fourth step is false under the condition that the judgment result of the second step is not maintained in the set range within the set time; the start time of the set time of the fourth judgment is the time when the second judgment result is true.
Optionally, the subsequent determination further includes determining: after judging that T2 is greater than T2, judging whether a is maintained within a set range within a set time; if the judgment result of the step a is judged to be maintained in the set range within the set time, the judgment result of the step five is judged to be true; if the judgment result a is not maintained in the set range within the set time, judging the judgment result of the fifth step to be false; the start time of the set time of the fifth judgment is the time when the fourth judgment result is true.
Optionally, when a temperature range of the motor temperature sensor is considered, the temperature T1= Tmin + δ, where Tmin is a lower limit value of the temperature range of the motor temperature sensor; and delta is a fixed value and is used for increasing T1 so as to enable T1 to be close to the temperature of the normal low-temperature environment outside.
Optionally, the subsequent determination further includes determining: judging whether the motor continuously operates within a set time; judging that the judgment result of the sixth judgment is true under the condition that the motor is judged to continuously run within the set time; judging that the judgment result of the sixth judgment is false under the condition that the motor does not continuously run within the set time; the starting time of the set time of the judgment six is the time when the first result is judged to be true or the time when the third result is judged to be true.
Optionally, the temperature T2= T1+5 ℃.
The invention provides a fault judgment device of a motor temperature sensor, which comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the computer program executes the fault judgment method of the motor temperature sensor when running.
The invention provides a vehicle, comprising: the fault judgment device comprises a motor, a motor temperature sensor, a motor controller temperature sensor and a motor temperature sensor; the heat exchange part of the motor controller and the heat exchange part of the motor are connected with the same heat exchange system through pipelines so that heat emitted by the motor and the motor controller exchanges heat with a heat exchange medium in the heat exchange system; the fault judgment device of the motor temperature sensor comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, wherein the computer program executes the fault judgment method of the motor temperature sensor when running.
The present invention provides another vehicle including: the motor, the motor temperature sensor, the motor controller and the motor controller temperature sensor; the heat exchange part of the motor controller and the heat exchange part of the motor are connected with the same heat exchange system through pipelines so that heat emitted by the motor and the motor controller is exchanged with a heat exchange medium in the heat exchange system; the motor controller comprises a memory, a processor and a computer program which is stored in the memory and can run on the processor, and the computer program executes the fault judgment method of the motor temperature sensor when running.
Drawings
FIG. 1 is a schematic illustration of a drive system for a vehicle embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a motor control system in a vehicle of the present invention;
FIG. 3 is a schematic illustration of a motor and motor controller cooling system in an embodiment of the vehicle of the present invention;
FIG. 4 is a logic flow diagram of a first embodiment of a method for determining a fault in a motor temperature sensor according to the present invention;
fig. 5 is a logic flow diagram of a second embodiment of the method for determining a fault of a motor temperature sensor according to the present invention.
Detailed Description
Embodiments of the vehicle of the invention:
the vehicle of the embodiment is a pure electric vehicle, and may be a hybrid vehicle in other embodiments, for example, the vehicle driving system shown in fig. 1 includes a motor, a motor temperature sensor (not shown), a motor controller temperature sensor (not shown), a power battery pack, and a cooling system.
The power battery pack outputs voltage to the motor to enable the motor to provide power for a vehicle, the motor controller is used for controlling the motor, the motor controller is in communication connection with the motor temperature sensor and the motor controller temperature sensor, the motor temperature sensor is used for sensing the temperature of the motor and outputting the temperature to the motor controller through the CAN network, the motor controller temperature sensor is used for sensing the temperature of the motor controller and outputting the temperature to the motor controller through the CAN network, and a current schematic diagram of the motor control system is shown in figure 2.
As shown in fig. 3, the cooling system includes a water pump, a radiator and a pipeline, wherein cooling water flows in a circulating manner, the cooling water is a cooling medium, and the cooling system is actually a heat exchange system for exchanging heat between the heat generated by the motor and the motor controller and the heat exchange medium in the heat exchange system, so as to ensure that the temperatures of the motor controller and the motor do not exceed the threshold range of normal operation.
The motor controller comprises a memory and a processor, wherein the memory stores a computer program running on the processor so as to execute the fault judgment method of the motor temperature sensor. The specific method for determining the fault of the motor temperature sensor is described in detail in the following embodiments of methods for determining the fault of the motor temperature sensor. In this embodiment, the motor controller is a failure determination device of the motor temperature sensor, but in other embodiments, the failure determination device of the motor temperature sensor, which executes the failure determination method of the motor temperature sensor, may also be another controller besides the motor controller, such as a controller of a cooling system or a vehicle controller.
In the embodiment of the vehicle, the installation positions of the motor controller and the temperature sensor thereon are on the frame far away from the motor on the vehicle, and compared with the installation of the motor temperature sensor on the vehicle suspension (as described in the background technology), the probability that the motor controller temperature sensor is damaged due to bumping is extremely low, so that the failure rate of the motor controller temperature sensor is extremely low and the reliability is higher compared with the failure rate of the motor temperature sensor, and therefore, the reliability of failure judgment of the motor temperature sensor is higher based on the motor controller temperature sensor as a supplementary judgment condition. Of course, in other embodiments of the present invention, the motor controller is not limited to the vehicle frame for the above description of the effect, and it can also improve the reliability of the failure determination.
It should be noted that the motor temperature sensor in the present embodiment of the vehicle is a positive temperature coefficient sensor (PTC), and for the temperature sensor, there are two main types of signals output by the current temperature sensor according to the sensor: one is a traditional thermistor temperature sensor, the output signal value of which is a voltage signal, and the voltage signal can determine the temperature value of the motor through analog-to-digital conversion and data processing processes thereof, for example, the working temperature of a PT1000 platinum thermistor is-40 ℃ to 85 ℃; the other is an improved intelligent temperature sensor, the output signal value of which is a temperature value, and because the improved intelligent temperature sensor is internally provided with an integrated chip and can directly process the voltage signal acquired by the temperature sensor and convert the voltage signal into a corresponding temperature value, the output signal value of the improved intelligent temperature sensor is a temperature value, for example, the DS18B20 of DALLAS semiconductor company in America, and the working temperature is-40 ℃ to 85 ℃.
Therefore, in the context of the present invention, a temperature signal value (motor temperature sensor or motor control temperature sensor) is a voltage value when a different type of temperature sensor is used; in another case, the signal value output by the temperature sensor is directly the temperature value. In the following embodiments of the method for determining a fault of a motor temperature sensor, a signal value output by the temperature sensor is taken as a temperature value as an example, and the following description is made specifically.
The temperature sensor using the thermistor includes a positive temperature coefficient sensor (PTC, which is a thermistor having a resistance that decreases with decreasing temperature and increases with increasing temperature) and a negative temperature coefficient sensor (NTC, which is a thermistor having a resistance that increases with increasing temperature and decreases with increasing temperature). Therefore, in a low-temperature environment (lower than zero degrees centigrade), the output temperature signal of the PTC will be close to the temperature signal in the short-circuit (small resistance even close to 0) fault, and the NTC is just the opposite, and the output temperature signal of the PTC in the low-temperature environment is very close to the temperature signal in the open-circuit (large open resistance close to infinity) fault. The temperature signal here may be a voltage value or a temperature value.
Therefore, the motor temperature sensor fault determination presented herein in the present invention, whether a method or a device, for employing a positive temperature coefficient sensor (PTC), refers to the determination of "motor temperature sensor short circuit fault". The negative temperature coefficient sensor (NTC) is used to determine a "motor temperature sensor open circuit fault". However, in the determination of any kind of fault, since it is possible to occur only in a low-temperature environment, the correct actual temperature signal value is difficult to distinguish from the error signal at the time of the fault, and therefore the determination logics of both are the same.
The first embodiment of the method for judging the fault of the motor temperature sensor comprises the following steps:
as shown in fig. 4, the method comprises the steps of:
step 1, controlling an ON ignition switch of a whole vehicle to be turned ON, and completing electrification of a motor controller;
step 2, acquiring a motor temperature signal value a output by a motor temperature sensor in real time, wherein the motor temperature signal value a is used for representing the temperature t1 of the motor; the motor temperature sensor is arranged close to the motor so as to monitor the temperature of the motor in real time, and the temperature t1 of the motor can be obtained through the acquired motor temperature signal value a output by the motor temperature sensor;
step 3, comparing the motor temperature signal value a with a first set value A, and carrying out prejudgment control on a motor temperature sensor;
the first set value a corresponds to the temperature T1, the first set value a corresponding to the temperature signal value a may be a voltage value or may directly be a temperature value, when the first set value a is the voltage value, the temperature value may be determined to be T1 according to a corresponding relationship between the voltage value and the temperature value, and when the first set value a is directly the temperature value, the first set value a is the temperature T1.
T1 corresponding to the first set value a may be set only according to the ambient temperature of the area where the vehicle is located, that is, only a fixed value; the temperature T1= Tmin + delta can also be set according to the temperature range of the temperature sensor, wherein Tmin is the lower limit value of the temperature range of the motor temperature sensor; delta is a fixed value and is used for increasing T1 so as to enable the T1 to be close to the temperature of the external normal low-temperature environment; delta =5 ℃ to 10 ℃. In the present embodiment, tmin = -40 ℃, δ =5 ℃, and thus, the temperature T1= -35 ℃.
Comparing the motor temperature signal value a with the first set value A, judging whether the result that the temperature T1 is less than or equal to the temperature T1 can be reflected, taking the output motor temperature signal value a as the temperature value T1 directly as an example in the step 2, taking the first set value A as the temperature T1 directly as an example in the step for convenient direct comparison, and continuing to execute the comparison step.
When the temperature T1 is judged to be less than or equal to the temperature T1, continuously judging the change of the temperature T1 within a certain time (for example, 5 s), and if the temperature T1 is kept unchanged or the temperature T1 is kept within a set range (T1 +/-0.05 ℃), prejudging that the motor temperature sensor has a fault; when the motor temperature sensor is judged to be in fault, executing the step 4; otherwise, it is directly determined that the motor temperature sensor is not malfunctioning, and step 7 is performed.
The step 3 is the first judgment and the third judgment in the embodiment of the fault judgment method, and has the significance of performing prejudgment, namely prejudging whether the motor temperature sensor is likely to have a fault. The judgment of the temperature T1 which is less than or equal to the temperature T1 is a first judgment, other judgments are subsequent judgments of the first judgment (the subsequent judgments in the invention are two to six, which will be explained later), and when more than two subsequent judgments exist and the judgment results are true, the motor temperature sensor is determined to be in fault; and when one of the judgment results of the subsequent judgments is false, determining that the temperature sensor does not have a fault. The third judgment that whether the signal value a is maintained in the set range within the set time is a third judgment for improving the accuracy of the judgment, and the third judgment is a subsequent judgment of the first judgment, and the sequence of the third judgment can also be shifted backwards, for example, in the second fault judgment method, the last judgment can be performed.
And 4, acquiring a signal value b output by the temperature sensor of the motor controller, wherein the signal value b is used for representing the temperature t2 of the motor controller. Referring to the analysis of the temperature sensor in step 2, it can be known that the signal value b is only used for representing the temperature t2 of the motor controller, and the signal value b does not directly refer to a temperature value, and according to the type of the temperature sensor used, the signal value b output by the signal value b may be a voltage value, the voltage value is converted to obtain the temperature t2, and the signal value b output by the signal value b may also be directly a temperature value t2. In the present embodiment, the present embodiment will be described specifically by taking as an example that the signal value b output from the temperature sensor of the motor controller is directly the temperature value t2.
Step 5, comparing the signal value B with a second set value B; the second set value B corresponds to the temperature T2, the second set value B may be a voltage value or may be directly a temperature value, when the second set value B is a voltage value, the temperature value may be determined to be T2 according to a corresponding relationship between the voltage value and the temperature value, and when the second set value B is directly a temperature value, the second set value B is the temperature T2.
Comparing the signal value B with the second set value B, determining whether the result that the temperature T2 is greater than or equal to the temperature T2 can be reflected, taking the example that the output signal value B is the temperature value T2 directly in the step 2 as an example, in the step, taking the example that the second set value B is the temperature T2 directly in order to facilitate direct comparison, and continuing to execute the comparison step.
When the temperature T2 is judged to be not less than the temperature T2, directly judging that the motor temperature sensor has a fault, and executing the step 6; or when the temperature T2 is judged to be more than or equal to the temperature T2, continuously judging the change of the temperature T2 within 5s, if the temperature T2 is kept unchanged or the temperature T2 is kept within a set range (T2 +/-0.05 ℃), judging that the motor temperature sensor has a fault, and executing the step 6; otherwise, it is determined that the motor temperature sensor is not malfunctioning, and step 7 is performed.
The comparison and determination in steps 4 and 5 are determination two and determination four in the embodiment of the fault determination method, wherein the determination that the temperature T2 is greater than or equal to the temperature T2 is determination two, and the determination that whether the temperature b is maintained within the set range within the set time is determination four. The significance lies in that:
as described above, in the cooling system of the vehicle, specifically, as shown in fig. 4, the motor controller and the motor share the cooling system, and since the motor and the motor controller exchange generated heat to the cooling medium in the cooling system during operation, after the motor is started when the motor temperature sensor fails, the temperature T2 corresponding to the second set value B should be set to be greater than the temperature T1 (T2 ≧ T1) because the temperatures of the motor, and the motor controller should be higher than the temperature threshold T1 of the motor controller after the motor is started because the temperature of the cooling medium. In the present embodiment, T2= T1+5, and the temperature T1= -35 ℃, so T2= -30 ℃.
For example, setting T1= -35 ℃, T2= -30 ℃; when the environmental temperature is lower than-35 ℃, the temperature of the motor and the motor controller is lower than-35 ℃ before the vehicle is started, the motor controller and the motor are heated after the vehicle is started, the water temperature of the cooling system is continuously increased, the temperature of the motor and the motor controller is supposed to be gradually increased under the normal condition, after the motor system continuously works for 5min, if the temperature t2 of the motor controller is higher than-30 ℃ and the temperature of the motor is still lower than-35 ℃, the motor temperature sensor is in short circuit fault, and the step 6 is executed; and if the temperature t2 of the motor controller is not higher than-30 ℃, the short-circuit fault of the motor temperature sensor is not generated, and the step 7 is executed.
Step 6, reporting the fault;
the signal that the motor temperature sensor breaks down is sent to a driver instrument desk of the whole vehicle through a signal wire, and alarm display is carried out, for example, a display lamp of the working state of the motor temperature sensor changes from green to red, or alarm is realized through voice reminding. Then the driver can reduce the output power of the motor or slowly control the stop according to the actual running condition.
Step 7, the motor controller normally executes output control;
and the motor controller formulates a corresponding control strategy according to the reported motor temperature T1 and controls and executes the output motor temperature T1 required normally according to the control strategy.
The second embodiment of the method for judging the fault of the motor temperature sensor comprises the following steps:
as shown in fig. 5, the difference from the first embodiment of the method for determining a fault of a motor temperature sensor of the present invention is that the second embodiment of the method for determining a fault of a motor temperature sensor of the present invention considers the detection of whether a motor is running, that is, after the first embodiment of the method for determining a fault of a motor of the present invention, another subsequent determination is added: and sixthly, detecting and judging the running state of the motor after the motor temperature sensor is judged to be in fault in advance and before a signal value output by the temperature sensor of the motor controller is acquired. The detection and judgment means of the running state of the motor is as follows: and judging whether the output power P of the motor is greater than zero. If the maintaining time of P >0 is more than 5min, judging the operation of the motor, continuously executing the acquisition of the signal value B, and comparing and judging with a second set value B; otherwise, the motor is judged to be stopped, and the control of the motor is stopped. The judgment of the battery running state is to detect the current of the motor through a motor current sensor, the output power of the motor can be calculated through the current, and then the judgment of whether the motor runs or not can be realized.
In addition, considering that the time for judging the running state of the motor is relatively long, the output value a of the motor temperature sensor can be judged once again so as to ensure the accuracy of the judgment of the motor temperature sensor. Namely, the first judgment of the already mentioned judgment method of the present invention in the first embodiment of the failure judgment method of the motor temperature sensor is taken as the fifth judgment in the subsequent judgment. The fifth determination may occur after the sixth determination or after the fourth determination. That is, the present invention does not specifically limit the order of the subsequent judgments.
The invention relates to a fault judgment device of a motor temperature sensor, which comprises:
the fault judgment device of the motor temperature sensor comprises a memory, a processor and a computer program which is stored in the memory and can be run on the processor, wherein the processor realizes the steps in the two method embodiments when running the computer program, and the specific comparison and judgment process of different signal values is described in detail in the two method embodiments and is not described in detail herein. The failure determination device of the motor temperature sensor for executing the failure determination method of the motor temperature sensor on the vehicle may be a motor controller, or may be another controller other than the motor controller, such as a controller of a cooling system or a vehicle controller.
It should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope thereof, and although the present application has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that various changes, modifications or equivalents of the embodiments of the present application can be made after reading the present application, but these changes, modifications or equivalents are all within the protection scope of the claims of the present invention.
Claims (10)
1. A fault judgment method of a motor temperature sensor is characterized by comprising the following steps:
judging one: comparing a motor temperature signal value a output by a motor temperature sensor with a first set threshold value A, wherein the motor temperature signal value a corresponds to a temperature value T1 sensed by the motor temperature sensor, and the first set threshold value A corresponds to a temperature value T1 sensed by the motor temperature sensor; judging whether the comparison result of the a and the A reflects that T1 is smaller than T1 or not;
under the condition that T1 is not smaller than T1, determining that the temperature sensor does not have a fault;
when the T1 is smaller than the T1, at least one subsequent judgment is carried out, when only one subsequent judgment is carried out and the judgment result is true, the motor temperature sensor is determined to have a fault, and when more than two subsequent judgments are carried out and the judgment result of each subsequent judgment is true, the motor temperature sensor is determined to have a fault; when one of the judgment results of the subsequent judgments is false, determining that the temperature sensor does not have a fault;
the subsequent judgment comprises:
and II, judging: comparing a motor controller temperature signal value B output by a motor controller temperature sensor with a second set threshold value B, wherein the motor controller temperature signal value B corresponds to a motor controller temperature value T2, the second set threshold value B corresponds to a motor controller temperature value T2, and judging whether the comparison result of B and B reflects that T2 is greater than T2;
when the judgment result T2 is larger than the judgment result T2, judging that the judgment result of the second judgment is true;
under the condition that T2 is not larger than T2, judging that the judgment result of the second judgment is false;
the heat exchange part of the motor controller and the heat exchange part of the motor are connected with the same heat exchange system through pipelines, so that heat emitted by the motor and the motor controller is exchanged with heat exchange media in the heat exchange system.
2. The method of determining a fault in a motor temperature sensor of claim 1, wherein said subsequent determination further comprises determining three:
judging whether a is maintained in a set range within a set time;
when the judgment result a is maintained in the set range within the set time, the judgment result of the third judgment is true;
judging whether the judgment result of the third judgment is false under the condition that the judgment result of the third judgment is not maintained in the set range within the set time;
the starting time of the set time of the third judgment is the time when the first judgment result is true.
3. The method of determining a malfunction of a motor temperature sensor according to claim 1 or 2, wherein the subsequent determination further includes determining four:
after the T2 is judged to be larger than the T2, judging whether the b is maintained in the set range within the set time;
if the judgment result of b is maintained in the set range within the set time, judging the judgment result of the fourth step to be true;
if the b is not maintained within the set range within the set time, judging the judgment result of the fourth step is false;
the start time of the set time of the fourth judgment is the time when the second judgment result is true.
4. The method of claim 3, wherein said subsequent determination further comprises determining five:
after the T2 is judged to be larger than the T2, judging whether a is maintained in a set range within a set time;
if the judgment result a is maintained in the set range within the set time, judging that the judgment result of the fifth judgment is true;
if the judgment result of the step a is judged to be not maintained in the set range within the set time, judging that the judgment result of the step five is false;
the start time of the set time of the fifth judgment is the time when the fourth judgment result is true.
5. The method for determining a malfunction of a motor temperature sensor according to claim 1, wherein the temperature value T1= Tmin + δ, where Tmin is a lower limit value of a temperature range of the motor temperature sensor; and delta is a fixed value and is used for increasing T1 so as to enable T1 to be close to the temperature of the normal low-temperature environment outside.
6. The method of determining a failure of a temperature sensor of an electric motor according to claim 1, wherein the subsequent determination further includes determining six:
judging whether the motor continuously operates within a set time;
judging that the judgment result of the sixth judgment is true under the condition that the motor is judged to continuously run within the set time;
judging that the judgment result of the sixth judgment is false under the condition that the motor does not continuously run within the set time;
the starting time of the set time of the judgment six is the time when the judgment result is true.
7. The failure determination method of the motor temperature sensor according to claim 1, wherein the temperature value T2= T1+5 ℃.
8. A failure judgment apparatus of a motor temperature sensor, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is executed to perform the failure judgment method of the motor temperature sensor according to any one of claims 1 to 7.
9. A vehicle, characterized by comprising:
the motor, a motor temperature sensor, a motor controller temperature sensor and a fault judgment device of the motor temperature sensor; the heat exchange part of the motor controller and the heat exchange part of the motor are connected with the same heat exchange system through pipelines so that heat emitted by the motor and the motor controller is exchanged with a heat exchange medium in the heat exchange system;
a failure determination apparatus for a motor temperature sensor, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program when running executing the failure determination method for a motor temperature sensor according to any one of claims 1 to 7.
10. A vehicle, characterized by comprising:
the system comprises a motor, a motor temperature sensor, a motor controller and a motor controller temperature sensor; the heat exchange part of the motor controller and the heat exchange part of the motor are connected with the same heat exchange system through pipelines so that heat emitted by the motor and the motor controller exchanges heat with a heat exchange medium in the heat exchange system;
motor controller comprising a memory, a processor and a computer program stored in said memory and executable on said processor, said computer program when running executing a method for fault diagnosis of a motor temperature sensor according to any of claims 1-7.
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| CN202010054684.9A CN113135092B (en) | 2020-01-17 | 2020-01-17 | Fault judgment method and device for vehicle and motor temperature sensor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH07312802A (en) * | 1994-05-16 | 1995-11-28 | Hitachi Ltd | Drive control apparatus of motor-driven vehicle |
| JPH08214402A (en) * | 1995-02-03 | 1996-08-20 | Hitachi Ltd | Protective device and control method of motor car |
| JP3189701B2 (en) * | 1996-10-03 | 2001-07-16 | 日産自動車株式会社 | Abnormality determination device for vehicle temperature sensor |
| JP3931833B2 (en) * | 2003-04-15 | 2007-06-20 | アイシン・エィ・ダブリュ株式会社 | Electric vehicle drive control device, electric vehicle drive control method, and program thereof |
| US8244427B2 (en) * | 2010-05-24 | 2012-08-14 | GM Global Technology Operations LLC | Modular temperature performance diagnostic for a vehicle |
| JP2012165564A (en) * | 2011-02-07 | 2012-08-30 | Toyota Motor Corp | Apparatus and method for diagnosis of failure of vehicle |
| US9815456B2 (en) * | 2014-11-13 | 2017-11-14 | Ford Global Technologies, Llc | Methods and systems for temperature sensor fault detection |
| CN110247373B (en) * | 2018-03-07 | 2021-10-12 | 郑州宇通客车股份有限公司 | False alarm prevention control method and system for over-temperature protection of driving motor |
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