CN118500584A - Sensor diagnosis method, storage medium and vehicle - Google Patents
Sensor diagnosis method, storage medium and vehicle Download PDFInfo
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Abstract
The application provides a sensor diagnosis method, a storage medium and a vehicle, belonging to the technical field of vehicles, wherein the method comprises the following steps: acquiring a motor state of a target motor; determining a target diagnostic strategy for the target temperature sensor based on the motor status; acquiring inverter temperature information of a target motor acquired by a target temperature sensor; and diagnosing the inverter temperature information based on the target diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor. According to the embodiment of the application, a proper target diagnosis strategy can be dynamically matched according to the motor state of the target motor, and the target temperature sensor can be diagnosed in a targeted manner, so that the abnormal diagnosis can be simply and efficiently performed on the target temperature sensor on the premise of not increasing the hardware cost, the scheme is convenient to deploy and implement, a large calculation burden is not caused to the controller, and the diagnosis accuracy can be ensured.
Description
Technical Field
The present application relates to the field of vehicle technologies, and in particular, to a sensor diagnosis method, a storage medium, and a vehicle.
Background
With the rapid development of the vehicle industry, the traditional fuel oil vehicle is gradually advancing to new energy vehicles in response to the call of national energy conservation, emission reduction and carbon balance. The driving motor is used as one of the core components of the new energy vehicle and is responsible for converting electric energy into mechanical energy to drive the vehicle to advance or retreat, and the driving motor inverter is a device for converting direct current provided by the battery pack into alternating current required by the driving motor.
To ensure safe and reliable operation of the inverter, a temperature sensor is usually disposed on the inverter to monitor the temperature of the inverter. When the temperature sensor is abnormal, abnormal current output of the inverter can be caused, the torque calculated value is inaccurate, and finally abnormal power and torque output by the driving motor are caused.
In the related art, fault detection for a temperature sensor is generally to configure a plurality of temperature sensors for redundant monitoring, and whether the temperature sensors have faults or are unreliable is judged by comparing whether the readings of the plurality of temperature sensors are consistent; or calculating the calculated temperature value of the temperature sensor acquisition point through the temperature model, and then comparing the calculated value with the actual value to judge whether the temperature value acquired by the temperature sensor is credible. The method is often faced with the problems of hardware cost increase, complex model, huge calibration workload and the like, and the implementation difficulty is high.
Disclosure of Invention
The application provides a sensor diagnosis method, a storage medium and a vehicle, which are used for solving the problem that abnormality diagnosis of a temperature sensor cannot be simply and efficiently performed at present.
In order to solve the problems, the application adopts the following technical scheme:
In a first aspect, embodiments of the present application provide a sensor diagnosis method, the method including:
Acquiring a motor state of a target motor;
determining a target diagnostic strategy for a target temperature sensor based on the motor status; different motor states correspond to different diagnostic strategies;
acquiring inverter temperature information of the target motor acquired by the target temperature sensor;
And diagnosing the inverter temperature information based on the target diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
In an embodiment of the present application, the motor state includes an operating state and a non-operating state;
a step of determining a target diagnostic strategy for a target temperature sensor based on the motor status, comprising:
determining the target diagnostic strategy as a first diagnostic strategy if the motor state is the non-operating state; the first diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in a non-operating state;
Determining the target diagnostic strategy as a second diagnostic strategy when the motor state is the operating state; the second diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in an operating state.
In an embodiment of the present application, the step of diagnosing the inverter temperature information based on the target diagnosis strategy to obtain a diagnosis result for the target temperature sensor includes:
acquiring first state information of a vehicle under the condition that the target diagnosis strategy is the first diagnosis strategy;
And under the condition that the first state information meets a first diagnosis enabling condition, diagnosing the inverter temperature information based on the first diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
In an embodiment of the present application, the first state information includes first fault information of a motor controller, second fault information of the target temperature sensor, third fault information of a coolant temperature sensor, high-voltage state information of the vehicle, and/or parking duration of the vehicle;
The method further comprises the steps of:
and determining that the first state information meets the first diagnosis enabling condition under the condition that the first fault information indicates that the motor controller has no fault, the second fault information indicates that the target temperature sensor has no fault, the third fault information indicates that the cooling liquid temperature sensor has no fault, the high-voltage state information indicates that the vehicle is not in a high-voltage state, and/or the vehicle is parked with a time length longer than a time length threshold value.
In an embodiment of the present application, the inverter temperature information includes a first phase temperature, a second phase temperature, and a third phase temperature of the inverter;
Diagnosing the inverter temperature information based on the first diagnostic strategy, and obtaining a diagnostic result for the target temperature sensor, including:
determining the highest and lowest of the first, second and third phase temperatures;
Determining a first temperature difference between the maximum temperature and a coolant temperature and a second temperature difference between the minimum temperature and the coolant temperature;
Under the condition that the first temperature difference and the second temperature difference are smaller than a first temperature threshold value, determining that the diagnosis result is that the target temperature sensor is normal;
And determining that the diagnosis result is abnormal of the target temperature sensor when any one of the first temperature difference and the second temperature difference is greater than or equal to the first temperature threshold.
In an embodiment of the present application, the step of diagnosing the inverter temperature information based on the target diagnosis strategy to obtain a diagnosis result for the target temperature sensor includes:
acquiring second state information of the vehicle under the condition that the target diagnosis strategy is the second diagnosis strategy;
And under the condition that the second state information meets a second diagnosis enabling condition, diagnosing the inverter temperature information based on the second diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
In an embodiment of the present application, the second status information includes first fault information of the motor controller and/or second fault information of the target temperature sensor;
The method further comprises the steps of:
And determining that the second state information meets a second diagnosis enabling condition under the condition that the first fault information indicates that the motor controller has no fault and/or the second fault information indicates that the target temperature sensor has no fault.
In an embodiment of the present application, the inverter temperature information includes a first phase temperature, a second phase temperature, and a third phase temperature of the inverter;
Diagnosing the inverter temperature information based on the second diagnostic strategy, and obtaining a diagnostic result for the target temperature sensor, including:
Determining a third temperature difference between the first phase temperature and the second phase temperature, a fourth temperature difference between the first phase temperature and the third phase temperature, and a fifth temperature difference between the second phase temperature and the third phase temperature;
Determining that the diagnosis result is that the target temperature sensor is normal under the condition that the third temperature difference, the fourth temperature difference and the fifth temperature difference are smaller than or equal to a second temperature threshold value;
and determining that the diagnosis result is abnormal in the target temperature sensor when any one of the third temperature difference, the fourth temperature difference and the fifth temperature difference is greater than the second temperature threshold.
In an embodiment of the present application, after the step of diagnosing the inverter temperature information based on the target diagnosis strategy to obtain a diagnosis result for the target temperature sensor, the method further includes:
Outputting alarm information under the condition that the diagnosis result is that the target temperature sensor is abnormal; the alarm information is used for indicating that the target temperature sensor is abnormal.
In a second aspect, based on the same inventive concept, an embodiment of the present application provides a sensor diagnosis apparatus, the apparatus including:
the state acquisition module is used for acquiring the motor state of the target motor;
A strategy determination module for determining a target diagnostic strategy for a target temperature sensor based on the motor status; different motor states correspond to different diagnostic strategies;
The temperature acquisition module is used for acquiring the inverter temperature information of the target motor acquired by the target temperature sensor;
And the diagnosis module is used for diagnosing the inverter temperature information based on the target diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
In an embodiment of the present application, the motor state includes an operating state and a non-operating state; the policy determination module comprises:
A first strategy determination submodule for determining the target diagnostic strategy as a first diagnostic strategy in the case that the motor state is the non-operating state; the first diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in a non-operating state;
a second strategy determination submodule, configured to determine the target diagnostic strategy as a second diagnostic strategy in the case where the motor state is the operating state; the second diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in an operating state.
In one embodiment of the application, the diagnostic module comprises:
a first information obtaining sub-module, configured to obtain first state information of a vehicle when the target diagnostic strategy is the first diagnostic strategy;
And the first diagnosis sub-module is used for diagnosing the inverter temperature information based on the first diagnosis strategy under the condition that the first state information meets a first diagnosis enabling condition, and obtaining a diagnosis result aiming at the target temperature sensor.
In an embodiment of the present application, the first state information includes first fault information of a motor controller, second fault information of the target temperature sensor, third fault information of a coolant temperature sensor, high-voltage state information of the vehicle, and/or parking duration of the vehicle;
The sensor diagnostic device further includes:
The first enabling judging module is used for determining that the first state information meets the first diagnosis enabling condition under the condition that the first fault information represents that the motor controller has no fault, the second fault information represents that the target temperature sensor has no fault, the third fault information represents that the cooling liquid temperature sensor has no fault, the high-voltage state information represents that the vehicle is not in a high-voltage state, and/or the vehicle is parked at a time longer than a time length threshold value.
In an embodiment of the present application, the inverter temperature information includes a first phase temperature, a second phase temperature, and a third phase temperature of the inverter;
the first diagnostic submodule includes:
A first temperature determination unit configured to determine a highest temperature and a lowest temperature among the first phase temperature, the second phase temperature, and the third phase temperature;
A first temperature difference determining unit configured to determine a first temperature difference between the highest temperature and a coolant temperature and a second temperature difference between the lowest temperature and the coolant temperature;
A first diagnosis unit, configured to determine that the target temperature sensor is normal as a result of the diagnosis, when the first temperature difference and the second temperature difference are both smaller than a first temperature threshold;
And a second diagnosis unit configured to determine that the diagnosis result is abnormal in the target temperature sensor, in a case where any one of the first temperature difference and the second temperature difference is greater than or equal to the first temperature threshold.
In one embodiment of the application, the diagnostic module comprises:
A second information obtaining sub-module, configured to obtain second state information of a vehicle when the target diagnostic strategy is the second diagnostic strategy;
And the second diagnosis sub-module is used for diagnosing the inverter temperature information based on the second diagnosis strategy under the condition that the second state information meets a second diagnosis enabling condition, and obtaining a diagnosis result aiming at the target temperature sensor.
In an embodiment of the present application, the second status information includes first fault information of the motor controller and/or second fault information of the target temperature sensor;
The sensor diagnostic device further includes:
And the second enabling judging module is used for determining that the second state information meets a second diagnosis enabling condition under the condition that the first fault information represents that the motor controller has no fault and/or the second fault information represents that the target temperature sensor has no fault.
In an embodiment of the present application, the inverter temperature information includes a first phase temperature, a second phase temperature, and a third phase temperature of the inverter;
the second diagnostic submodule includes:
A second temperature difference determining unit configured to determine a third temperature difference between the first phase temperature and the second phase temperature, a fourth temperature difference between the first phase temperature and the third phase temperature, and a fifth temperature difference between the second phase temperature and the third phase temperature;
A third diagnosis unit configured to determine that the target temperature sensor is normal as a result of the diagnosis, when the third temperature difference, the fourth temperature difference, and the fifth temperature difference are all less than or equal to a second temperature threshold;
a fourth diagnosing unit configured to determine that the diagnosis result is abnormal in the target temperature sensor, in a case where any one of the third temperature difference, the fourth temperature difference, and the fifth temperature difference is greater than the second temperature threshold.
In an embodiment of the present application, the sensor diagnosis apparatus further includes:
the alarm module is used for outputting alarm information under the condition that the diagnosis result is that the target temperature sensor is abnormal; the alarm information is used for indicating that the target temperature sensor is abnormal.
In a third aspect, based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium having stored thereon an executable program that when executed by a processor implements the sensor diagnosis method set forth in the first aspect of the present application.
In a fourth aspect, based on the same inventive concept, an embodiment of the present application provides a vehicle including:
A memory for storing an executable program;
A processor;
the sensor diagnosis method proposed by the first aspect of the present application is implemented when the executable program is executed by the processor.
Compared with the prior art, the application has the following advantages:
According to the sensor diagnosis method provided by the embodiment of the application, firstly, the motor state of the target motor is obtained, the target diagnosis strategy for the target temperature sensor is determined based on the motor state, then the inverter temperature information of the target motor acquired by the target temperature sensor is obtained, and finally the inverter temperature information is diagnosed based on the target diagnosis strategy, so that the diagnosis result for the target temperature sensor is obtained. According to the embodiment of the application, a proper target diagnosis strategy can be dynamically matched according to the motor state of the target motor, and the target temperature sensor can be diagnosed in a targeted manner, so that the abnormal diagnosis can be simply and efficiently performed on the target temperature sensor on the premise of not increasing the hardware cost, and a large calculation burden can not be caused on a controller.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of steps of a sensor diagnostic method according to an embodiment of the present application.
FIG. 2 is a functional block diagram of a sensor diagnostic device according to an embodiment of the present application.
Fig. 3 is a schematic view of a vehicle according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that the inverter plays a key role in the new energy vehicle, and it converts the dc power provided by the battery pack into an ac power signal required for driving the motor, and controls the rotational speed and torque output of the motor. The inverter controls the operation of the driving motor by adjusting the frequency, amplitude and phase of the current, and performs real-time control and adjustment according to driving requirements and vehicle states.
In the process of controlling the operation of the driving motor, the inverter can acquire temperature information acquired by the temperature sensor of the inverter, and the driving motor is controlled according to the current temperature information so as to ensure the normal operation of the driving motor and protect the reliability of a system. For example, when the temperature reaches or exceeds a set point, the inverter may take steps to reduce power or limit maximum acceleration or maximum speed, etc., to reduce the load and heat generation of the inverter.
Under the condition that the accuracy of the temperature sensor is possibly reduced in the long-term use process, when the temperature deviation acquired by the temperature sensor is overlarge, abnormal current output of the inverter is caused, the torque calculation value is inaccurate, and finally, the output power and the torque of the driving motor are abnormal.
In order to ensure normal detection of the inverter temperature sensor, the accuracy of the inverter temperature sensor needs to be detected. However, in the related art, either the solution is complex, the workload is large, and the solution deployment and implementation are inconvenient, for example, the diagnosis is performed by using a model; or requires an additional hardware configuration, resulting in increased costs, such as configuring redundant temperature sensors for diagnostics.
Aiming at the problem that the abnormality diagnosis of the temperature sensor cannot be simply and efficiently carried out at present. The application aims to provide a sensor diagnosis method, which can match a proper target diagnosis strategy according to the motor state of a target motor, and can pertinently diagnose the target temperature sensor by combining the inverter temperature information acquired by the target temperature sensor, so that the abnormality diagnosis of the target temperature sensor is simply and efficiently performed on the premise of not increasing the hardware cost, the scheme deployment and implementation are convenient, the larger calculation burden is not caused to a controller, and the diagnosis accuracy is effectively ensured.
Referring to FIG. 1, a sensor diagnostic method of the present application is shown, which may include the steps of:
s101: and acquiring the motor state of the target motor.
The execution body of the present embodiment may be a computing service device having functions of data processing, network communication, and program running, or an electronic device having the above functions, such as a driving computer, a vehicle-mounted computer, etc., for example, an ECU (electronic control unit), a BCM (BodyControlModule, a vehicle body control module), a VCU (VehicleControlUnit, a vehicle controller), a MCU (MotorControlUnit, a motor controller), etc., and the present embodiment will be described with respect to the MCU as the execution body, and it should be noted that the present embodiment does not specifically limit the execution body.
It should be further noted that, if the vehicle is configured to include an electric four-wheel-drive architecture of a front axle motor and a rear axle motor, the MCU may specifically include an FMCU (front axle motor controller) and a P4MCU (rear axle motor controller), where the FMCU is configured to perform the sensor diagnosis method provided by the present application to diagnose a temperature sensor configured in the front axle motor; the P4MCU is used for executing the sensor diagnosis method provided by the application to diagnose the temperature sensor arranged on the rear axle motor. That is, for an electric four-wheel drive architecture vehicle, the target motor may be any one of a front axle motor and a rear axle motor. Correspondingly, the target temperature sensor can be any one of a front axle temperature sensor for acquiring the inverter temperature information of the front axle motor and a rear axle temperature sensor for acquiring the inverter temperature information of the rear axle motor. The present embodiment does not make specific restrictions on the type and mounting position of the target motor and the target temperature sensor.
In the present embodiment, the inverter temperature information acquired by the target temperature sensor is also greatly different in consideration of the fact that the operating state of the inverter of the target motor is also different in different motor states. Thus, the MCU will first obtain the motor status of the target motor to purposefully match the appropriate target diagnostic strategy.
S102: a target diagnostic strategy for the target temperature sensor is determined based on the motor status.
In this embodiment, different motor states correspond to different diagnostic strategies.
In a specific implementation, the MCU stores a comparison table comprising a plurality of diagnosis strategy libraries and a mapping relation between different motor states and different diagnosis strategies, so that after the motor states are determined, the MCU can determine a target diagnosis strategy in the diagnosis strategy library in a table look-up mode.
In the present embodiment, by matching an appropriate target diagnosis strategy according to the motor state of the target motor, the target temperature sensor can be diagnosed with pertinence, and the diagnosis accuracy can be improved.
S103: and acquiring inverter temperature information of the target motor acquired by the target temperature sensor.
It should be noted that the target temperature sensor may be disposed at an output end of the inverter of the target motor, and configured to collect temperature information of the inverter.
In a specific implementation, considering that the output of the inverter is typically three-phase alternating current, in order to accurately and comprehensively acquire temperature information of the inverter, the target temperature sensor may specifically include a first temperature sensor, a second temperature sensor, and a third temperature sensor; the first temperature sensor is used for collecting first temperature information of an A phase (also called U phase) of the inverter, the second temperature sensor is used for collecting second temperature information of a B phase (also called V phase) of the inverter, and the third temperature sensor is used for collecting third temperature information of a C phase (also called W phase) of the inverter.
S104: and diagnosing the inverter temperature information based on the target diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
In this embodiment, after the MCU acquires the inverter temperature information acquired by the target temperature sensor, the MCU may diagnose the inverter temperature information according to the target diagnosis policy, so as to obtain a diagnosis result for the target temperature sensor in the current motor state.
In this embodiment, the MCU performs dynamic diagnosis according to the motor state change of the target motor, that is, if the MCU detects that the motor state of the target motor changes, the MCU will re-match the corresponding target diagnosis policy to perform diagnosis on the target temperature sensor according to the changed motor state, so as to perform comprehensive diagnosis on the target temperature sensor under different motor states.
In the present embodiment, the diagnosis results may specifically include both of the target temperature sensor normal and the target temperature sensor abnormal results. Specifically, the target temperature sensor normally indicates that the target temperature sensor is reliable, the detection precision is still within an allowable error range, and the target temperature sensor can be continuously used; the abnormality of the target temperature sensor indicates that the target temperature sensor is unreliable, and the detection accuracy thereof exceeds the allowable error range, so that the detection and maintenance are required.
According to the sensor diagnosis method provided by the embodiment of the application, a proper target diagnosis strategy can be dynamically matched according to the motor state of the target motor, so that the target temperature sensor can be diagnosed in a targeted manner. On the one hand, the exception diagnosis of the target temperature sensor can be realized on the premise of not increasing the hardware cost without additionally arranging hardware equipment; on the other hand, the strategy is simple, the deployment and the implementation are convenient, the controller cannot be subjected to larger calculation load, the abnormality diagnosis can be simply and efficiently performed on the target temperature sensor, and meanwhile, the diagnosis accuracy is ensured.
In one possible embodiment, the MCU will set two diagnostic strategies specifically to diagnose the target temperature sensor when the target motor is operating and not operating, respectively, considering that the temperature characteristics of the inverter are greatly different when the target motor is operating and not operating.
In a specific implementation, S102 may specifically include the following sub-steps:
s102-1: and under the condition that the motor state is a non-working state, determining the target diagnosis strategy as a first diagnosis strategy.
The first diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in a non-operating state.
In the present embodiment, when the motor state is the non-operating state, the temperature of the inverter is generally relatively low, and gradually approaches the ambient temperature as the non-operating period of the motor increases. At this time, the MCU will diagnose the target temperature sensor by executing the first diagnostic strategy. Specifically, the first diagnostic strategy is used to determine whether the temperature detected by the target temperature sensor is accurate when the motor state is the non-operating state.
S102-2: and under the condition that the motor state is the working state, determining the target diagnosis strategy as a second diagnosis strategy.
The second diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in an operating state.
In the present embodiment, when the motor state is the operation state, the temperature of the inverter is generally relatively high, and generally increases with an increase in the operation period. At this time, the MCU will diagnose the target temperature sensor by executing the second diagnostic strategy. Specifically, the first diagnostic strategy is used to determine whether the temperature detected by the target temperature sensor is accurate when the motor state is an operating state.
In this embodiment, by setting the first diagnosis policy and the second diagnosis policy to diagnose the target temperature sensor when the target motor is not operating and when the target motor is operating, it is possible to diagnose whether the accuracy of the target temperature sensor in the low-temperature environment and the high-temperature environment meets the requirement, thereby realizing the overall diagnosis of the target temperature sensor and ensuring the reliability of the target temperature sensor in different motor states.
In this embodiment, various operation conditions may exist in consideration of the target motor being in an operating state, such as an idle operation condition, a light load condition, a normal operation condition, and an overload operation condition. Therefore, corresponding diagnosis strategies can be further set according to different operation conditions of the target motor in the working state, namely, different operation conditions correspond to different diagnosis strategies. Thus, a more accurate diagnosis of the target temperature sensor can be realized.
In a possible embodiment, S104 may specifically include the following substeps:
S104-A1: and under the condition that the target diagnosis strategy is the first diagnosis strategy, acquiring first state information of the vehicle.
In the present embodiment, considering that the target temperature sensor is diagnosed when the motor state is the non-operating state, the influence of the related factors on the diagnosis result needs to be eliminated, and therefore, the diagnosis enabling judgment is performed before the diagnosis is performed, so as to ensure the diagnosis accuracy.
In a specific implementation, the first diagnosis strategy is a diagnosis strategy aiming at the target temperature sensor when the target motor is in a non-working state, so that first state information of the vehicle when the target motor is in the non-working state is acquired, and diagnosis enabling judgment is further carried out according to the first state information.
In the present embodiment, the first state information may include first failure information of the motor controller, second failure information of the target temperature sensor, third failure information of the coolant temperature sensor, high-pressure state information of the vehicle, and/or a parking duration of the vehicle.
In a specific implementation, if the MCU detects that the first fault information indicates that the motor controller has no fault, the second fault information indicates that the target temperature sensor has no fault, the third fault information indicates that the cooling liquid temperature sensor has no fault, the high-voltage state information indicates that the vehicle is not in a high-voltage state, and/or the vehicle is parked with a time length greater than a time length threshold, it is determined that the first state information meets a first diagnosis enabling condition.
Preferably, all the first state information mentioned above may be comprehensively considered, that is, when the first fault information indicates that the motor controller has no fault, the second fault information indicates that the target temperature sensor has no fault, the third fault information indicates that the coolant temperature sensor has no fault, the high-voltage state information indicates that the vehicle is not in a high-voltage state, and the time period when the vehicle is parked is longer than the time period threshold value, it is determined that the first state information satisfies the first diagnosis enabling condition.
It should be noted that, the motor controller, that is, the MCU as the execution body needs to ensure that it performs diagnosis under the condition of no fault; the target temperature sensor is used as a main body to be diagnosed, if diagnosis is carried out under the condition that the target temperature sensor has faults, the diagnosis result is meaningless, and therefore, the fault-free report of the target temperature sensor is also required to be ensured; the cooling liquid temperature sensor has no fault to indicate that the temperature of the cooling liquid is accurate and reliable, and the accuracy of a diagnosis result can be ensured when a comparison object is diagnosed later; the high-voltage state information is to ensure that the vehicle is electrified and the target motor and the inverter are not in a working state; by setting the duration threshold, the vehicle can be ensured to be parked for a long time, for example, the duration threshold can be set to be 10 hours, and further, the problem that the diagnosis result is unreliable due to incomplete dissipation of heat of the inverter is effectively avoided.
In the present embodiment, by comprehensively considering the failure information of each component and the stay time of the vehicle, the accuracy and effectiveness of the diagnosis result can be sufficiently ensured.
S104-A2: and under the condition that the first state information meets the first diagnosis enabling condition, diagnosing the inverter temperature information based on the first diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
After the vehicle is started and the MCU is electrified and wakened, the MCU acquires first state information of the vehicle and judges the enabling conditions, and if the first state information is detected to meet the first diagnosis enabling conditions, a first diagnosis strategy is immediately executed to diagnose the temperature information of the inverter.
In a specific implementation, the inverter temperature information includes a first phase temperature, a second phase temperature, and a third phase temperature of the inverter. S104-A2 may specifically include the following sub-steps:
S104-A2-1: the highest and lowest temperatures of the first, second, and third phase temperatures are determined.
In this embodiment, the MCU compares the highest temperature and the lowest temperature selected among the first phase temperature, the second phase temperature, and the third phase temperature with the coolant temperature to determine whether the target temperature sensor is accurate and reliable, in order to reduce the amount of calculation.
S104-A2-2: a first temperature difference between the highest temperature and the coolant temperature and a second temperature difference between the lowest temperature and the coolant temperature are determined.
The coolant temperature is temperature information of the coolant collected by the coolant temperature sensor. The temperature of the cooling liquid corresponds to the ambient temperature of the vehicle, and under normal conditions, that is, under the condition that the first state information satisfies the first diagnosis enabling condition, the temperature acquired by the target temperature sensor should be the same as or similar to the temperature of the cooling liquid.
In the present embodiment, since the coolant temperature may be between the highest temperature and the lowest temperature, a first temperature difference between the highest temperature and the coolant temperature and a second temperature difference between the lowest temperature and the coolant temperature will be calculated, respectively. Wherein, the first temperature difference and the second temperature difference each represent an absolute value of the corresponding temperature difference.
S104-A2-3: and under the condition that the first temperature difference and the second temperature difference are smaller than the first temperature threshold value, determining that the diagnosis result is that the target temperature sensor is normal.
In the present embodiment, the first temperature threshold value indicates that a deviation between the inverter temperature and the coolant temperature is allowed when the motor state is the non-operating state, and may be set to 10 ℃. That is, if the first temperature difference and the second temperature difference are both less than 10 ℃, the diagnosis result is considered that the target temperature sensor is normal, the accuracy thereof is within an acceptable range, and the temperature detection result is reliable.
S104-A2-4: and determining that the diagnosis result is abnormal in the target temperature sensor when any one of the first temperature difference and the second temperature difference is greater than or equal to the first temperature threshold.
In this embodiment, if the first temperature difference is detected to be equal to or greater than the first temperature threshold value, or the second temperature difference is detected to be equal to or greater than the first temperature threshold value, the diagnosis result is considered to be abnormal in the target temperature sensor, the accuracy error is large, and the acquired inverter temperature information is unreliable.
In the present embodiment, in the case where the motor state is the non-operating state, by setting the first diagnosis enabling condition and comparing the maximum value and the minimum value in the inverter temperature information with the coolant temperature, it is possible to realize effective diagnosis of the target temperature sensor without additionally adding a sensor.
In a possible embodiment, S104 may specifically further comprise the following substeps:
S104-B1: and acquiring second state information of the vehicle under the condition that the target diagnosis strategy is the second diagnosis strategy.
In the present embodiment, considering that the target temperature sensor is diagnosed when the motor state is in the operating state, it is also necessary to exclude the influence of the related factors on the diagnosis result, and therefore, the diagnosis enable determination is performed before the diagnosis is performed, so as to ensure the diagnosis accuracy.
In a specific implementation, the second diagnosis strategy is a diagnosis strategy aiming at the target temperature sensor when the target motor is in a working state, so that second state information of the vehicle when the target motor is in the working state is acquired, and diagnosis enabling judgment is further carried out according to the second state information.
In this embodiment, the first state information may include first failure information of the motor controller and/or second failure information of the target temperature sensor.
In a specific implementation, if the MCU detects that the first fault information indicates that the motor controller has no fault and/or the second fault information indicates that the target temperature sensor has no fault, the MCU determines that the second state information meets a second diagnosis enabling condition.
Preferably, all the above-mentioned second state information may be taken into consideration in combination, i.e. in case the first fault information characterizes that the motor controller is fault-free and the second fault information characterizes that the target temperature sensor is fault-free, it is determined that the second state information fulfils the second diagnostic enabling condition.
It should be noted that, the motor controller, that is, the MCU as the execution body needs to ensure that it performs diagnosis under the condition of no fault; the target temperature sensor is used as a main body to be diagnosed, and if diagnosis is performed in the case that the target temperature sensor has a fault, the diagnosis result is meaningless, so that the target temperature sensor needs to be ensured to report no fault.
In the embodiment, the accuracy and effectiveness of the diagnosis result can be ensured by integrating the fault information of the MCU and the target temperature sensor.
S104-B2: and under the condition that the second state information meets the second diagnosis enabling condition, diagnosing the inverter temperature information based on a second diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
In this embodiment, after detecting that the motor state is the working state, the MCU may trigger the diagnostic procedure of the target temperature sensor for a preset period of time at each interval, so as to implement periodic diagnosis of the target temperature sensor, and ensure that the detection result of the target temperature sensor is reliable during long-time operation of the inverter.
In a specific implementation, the inverter temperature information includes a first phase temperature, a second phase temperature, and a third phase temperature of the inverter; S104-B2 may specifically comprise the following sub-steps:
S104-B2-1: a third temperature difference between the first phase temperature and the second phase temperature, a fourth temperature difference between the first phase temperature and the third phase temperature, and a fifth temperature difference between the second phase temperature and the third phase temperature are determined.
It should be noted that, under normal conditions, when the motor state is in the working state, the first phase temperature, the second phase temperature and the third phase temperature acquired by the first temperature sensor, the second temperature sensor and the third temperature sensor in the target temperature sensor should be the same or similar, so the MCU can directly diagnose the target temperature sensor according to the first phase temperature, the second phase temperature and the third phase temperature.
In a specific implementation, after detecting that the second state information meets the second diagnosis enabling condition, the MCU calculates a temperature difference of any two phases of the first phase temperature, the second phase temperature and the third phase temperature, and then diagnoses the target temperature sensor according to the temperature difference of any two phases. Wherein, the third temperature difference, the fourth temperature difference and the fifth temperature difference are all absolute values of the corresponding temperature differences.
S104-B2-2: and under the condition that the third temperature difference, the fourth temperature difference and the fifth temperature difference are smaller than or equal to the second temperature threshold value, determining that the diagnosis result is that the target temperature sensor is normal.
In the present embodiment, the second temperature threshold value represents a deviation that allows the temperature between any two phases in the inverter to exist when the motor state is the operation state, and may be set to 40 ℃. That is, if the third temperature difference, the fourth temperature difference, and the fifth temperature difference are all detected to be less than or equal to 40 ℃, the diagnosis result is considered to be that the target temperature sensor is normal, the accuracy thereof is within the acceptable range, and the temperature detection result is reliable.
S104-B2-3: and determining that the diagnosis result is abnormal in the target temperature sensor when any one of the third temperature difference, the fourth temperature difference and the fifth temperature difference is greater than the second temperature threshold.
In this embodiment, if the MCU detects that the temperature difference between any two phases is greater than 40 ℃, the diagnosis result is considered to be abnormal in the target temperature sensor, the accuracy error is large, and the acquired inverter temperature information is unreliable.
In the present embodiment, the second diagnosis enabling condition is set for the case where the motor state is the operation state, and the temperature difference between any two phases in the inverter temperature information is calculated and compared and analyzed in the case where the second diagnosis enabling condition is satisfied, so that the effective diagnosis of the target temperature sensor can be realized without increasing the hardware cost.
In one possible embodiment, after S104, the sensor diagnosis method may further include the steps of:
s105: and outputting alarm information under the condition that the diagnosis result is that the target temperature sensor is abnormal.
In this embodiment, if the MCU diagnoses that the target temperature sensor is abnormal, it will send alarm information to the driver and the after-sales server at the same time; the alarm information is used for indicating that the target temperature sensor is abnormal.
In a specific implementation, for the driver, the MCU may output warning information to the driver through a vehicle instrument, for example, a virtual fault light in a control display screen or a preset warning light.
Further, the MCU can also acquire the address information of the target maintenance point closest to the vehicle, output prompt information to the driver and provide the address information of the target maintenance point. The prompt information is used for prompting a driver to pay attention to safe driving and going to a target maintenance point for maintenance.
In a specific implementation, for the after-sales service end, the MCU can send alarm information to the after-sales service end through the vehicle-mounted terminal so as to remind maintenance personnel to check and maintain.
Further, the MCU can also send the position information of the vehicle and the contact way of the vehicle owner to the after-sales service end so that the after-sales service end contacts the vehicle owner in time, and actively provides maintenance service according to the position information of the vehicle, thereby improving the after-sales experience of a user.
In a second aspect, referring to fig. 2, based on the same inventive concept, an embodiment of the present application provides a sensor diagnosis apparatus 200, the sensor diagnosis apparatus 200 including:
a state acquisition module 201, configured to acquire a motor state of a target motor;
A strategy determination module 202 for determining a target diagnostic strategy for a target temperature sensor based on motor status; different motor states correspond to different diagnostic strategies;
the temperature acquisition module 203 is configured to acquire inverter temperature information of the target motor acquired by the target temperature sensor;
the diagnostic module 204 is configured to diagnose the inverter temperature information based on a target diagnostic strategy, and obtain a diagnostic result for the target temperature sensor.
In one embodiment of the application, the motor state includes an active state and an inactive state; the policy determination module 202 includes:
The first strategy determination submodule is used for determining a target diagnosis strategy as a first diagnosis strategy under the condition that the motor state is a non-working state; the first diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in a non-operating state;
The second strategy determination submodule is used for determining that the target diagnosis strategy is a second diagnosis strategy under the condition that the motor state is the working state; the second diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in an operating state.
In one embodiment of the application, the diagnostic module 204 includes:
the first information acquisition sub-module is used for acquiring first state information of the vehicle under the condition that the target diagnosis strategy is a first diagnosis strategy;
And the first diagnosis sub-module is used for diagnosing the temperature information of the inverter based on the first diagnosis strategy under the condition that the first state information meets the first diagnosis enabling condition, and obtaining a diagnosis result aiming at the target temperature sensor.
In an embodiment of the present application, the first state information includes first fault information of the motor controller, second fault information of the target temperature sensor, third fault information of the coolant temperature sensor, high-voltage state information of the vehicle, and/or a parking duration of the vehicle;
The sensor diagnostic apparatus 200 further includes:
The first enabling judging module is used for determining that the first state information meets the first diagnosis enabling condition under the condition that the first fault information indicates that the motor controller has no fault, the second fault information indicates that the target temperature sensor has no fault, the third fault information indicates that the cooling liquid temperature sensor has no fault, the high-voltage state information indicates that the vehicle is not in a high-voltage state, and/or the vehicle is parked with a time length longer than a time length threshold value.
In an embodiment of the present application, the inverter temperature information includes a first phase temperature, a second phase temperature, and a third phase temperature of the inverter;
The first diagnostic submodule includes:
A first temperature determination unit configured to determine a highest temperature and a lowest temperature among the first phase temperature, the second phase temperature, and the third phase temperature;
a first temperature difference determining unit for determining a first temperature difference between the highest temperature and the coolant temperature and a second temperature difference between the lowest temperature and the coolant temperature;
The first diagnosis unit is used for determining that the diagnosis result is that the target temperature sensor is normal under the condition that the first temperature difference and the second temperature difference are smaller than a first temperature threshold value;
And a second diagnosis unit configured to determine that the diagnosis result is abnormal in the target temperature sensor, in a case where any one of the first temperature difference and the second temperature difference is greater than or equal to the first temperature threshold.
In one embodiment of the application, the diagnostic module 204 includes:
the second information acquisition sub-module is used for acquiring second state information of the vehicle under the condition that the target diagnosis strategy is a second diagnosis strategy;
And the second diagnosis sub-module is used for diagnosing the temperature information of the inverter based on a second diagnosis strategy under the condition that the second state information meets a second diagnosis enabling condition, and obtaining a diagnosis result aiming at the target temperature sensor.
In an embodiment of the application, the second status information includes first fault information of the motor controller and/or second fault information of the target temperature sensor;
The sensor diagnostic apparatus 200 further includes:
And the second enabling judging module is used for determining that the second state information meets a second diagnosis enabling condition under the condition that the first fault information represents that the motor controller has no fault and/or the second fault information represents that the target temperature sensor has no fault.
In an embodiment of the present application, the inverter temperature information includes a first phase temperature, a second phase temperature, and a third phase temperature of the inverter;
The second diagnostic submodule includes:
A second temperature difference determining unit configured to determine a third temperature difference between the first phase temperature and the second phase temperature, a fourth temperature difference between the first phase temperature and the third phase temperature, and a fifth temperature difference between the second phase temperature and the third phase temperature;
A third diagnosis unit, configured to determine that the diagnosis result is that the target temperature sensor is normal, when the third temperature difference, the fourth temperature difference, and the fifth temperature difference are all less than or equal to the second temperature threshold;
And a fourth diagnosing unit configured to determine that the diagnosis result is abnormal in the target temperature sensor, in a case where any one of the third temperature difference, the fourth temperature difference, and the fifth temperature difference is greater than the second temperature threshold.
In an embodiment of the present application, the sensor diagnosis apparatus 200 further includes:
the alarm module is used for outputting alarm information under the condition that the diagnosis result is that the target temperature sensor is abnormal; the alarm information is used for indicating that the target temperature sensor is abnormal.
It should be noted that, the specific implementation of the sensor diagnosis apparatus 200 according to the embodiment of the present application refers to the specific implementation of the sensor diagnosis method set forth in the first aspect of the embodiment of the present application, and will not be described herein.
In a third aspect, based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium having stored thereon an executable program that when executed by a processor implements the sensor diagnosis method set forth in the first aspect of the present application.
It should be noted that, the specific implementation of the computer readable storage medium according to the embodiment of the present application refers to the specific implementation of the sensor diagnosis method set forth in the first aspect of the foregoing embodiment of the present application, and will not be described herein.
Fourth aspect, referring to fig. 3, based on the same inventive concept, an embodiment of the present application provides a vehicle 300 including:
a memory 301 for storing an executable program;
A processor 302;
The sensor diagnostic method proposed by the first aspect of the present application is implemented when the executable program is executed by the processor 302.
It should be noted that, the specific implementation of the vehicle 300 according to the embodiment of the present application refers to the specific implementation of the sensor diagnosis method set forth in the first aspect of the embodiment of the present application, and will not be described herein.
It will be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, apparatus, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.
Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, terminal devices (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing terminal device to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal device, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device that comprises the element.
The foregoing has outlined a detailed description of a sensor diagnostic method, storage medium and vehicle, wherein specific examples are provided herein to illustrate the principles and embodiments of the present invention, the above examples being provided solely to assist in the understanding of the method and core concepts of the present invention; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.
Claims (10)
1. A method of sensor diagnosis, the method comprising:
Acquiring a motor state of a target motor;
determining a target diagnostic strategy for a target temperature sensor based on the motor status; different motor states correspond to different diagnostic strategies;
acquiring inverter temperature information of the target motor acquired by the target temperature sensor;
And diagnosing the inverter temperature information based on the target diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
2. A sensor diagnostic method according to claim 1, wherein said motor conditions include an active condition and an inactive condition;
a step of determining a target diagnostic strategy for a target temperature sensor based on the motor status, comprising:
determining the target diagnostic strategy as a first diagnostic strategy if the motor state is the non-operating state; the first diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in a non-operating state;
Determining the target diagnostic strategy as a second diagnostic strategy when the motor state is the operating state; the second diagnostic strategy is a diagnostic strategy for the target temperature sensor when the target motor is in an operating state.
3. The sensor diagnosis method according to claim 2, characterized in that the step of diagnosing the inverter temperature information based on the target diagnosis strategy, to obtain a diagnosis result for the target temperature sensor, comprises:
acquiring first state information of a vehicle under the condition that the target diagnosis strategy is the first diagnosis strategy;
And under the condition that the first state information meets a first diagnosis enabling condition, diagnosing the inverter temperature information based on the first diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
4. A sensor diagnosis method according to claim 3, characterized in that the first state information includes first failure information of a motor controller, second failure information of the target temperature sensor, third failure information of a coolant temperature sensor, high-pressure state information of the vehicle, and/or a parking period of the vehicle;
The method further comprises the steps of:
and determining that the first state information meets the first diagnosis enabling condition under the condition that the first fault information indicates that the motor controller has no fault, the second fault information indicates that the target temperature sensor has no fault, the third fault information indicates that the cooling liquid temperature sensor has no fault, the high-voltage state information indicates that the vehicle is not in a high-voltage state, and/or the vehicle is parked with a time length longer than a time length threshold value.
5. A sensor diagnostic method according to claim 3, wherein the inverter temperature information comprises a first phase temperature, a second phase temperature and a third phase temperature of the inverter;
Diagnosing the inverter temperature information based on the first diagnostic strategy, and obtaining a diagnostic result for the target temperature sensor, including:
determining the highest and lowest of the first, second and third phase temperatures;
Determining a first temperature difference between the maximum temperature and a coolant temperature and a second temperature difference between the minimum temperature and the coolant temperature;
Under the condition that the first temperature difference and the second temperature difference are smaller than a first temperature threshold value, determining that the diagnosis result is that the target temperature sensor is normal;
And determining that the diagnosis result is abnormal of the target temperature sensor when any one of the first temperature difference and the second temperature difference is greater than or equal to the first temperature threshold.
6. The sensor diagnosis method according to claim 2, characterized in that the step of diagnosing the inverter temperature information based on the target diagnosis strategy, to obtain a diagnosis result for the target temperature sensor, comprises:
acquiring second state information of the vehicle under the condition that the target diagnosis strategy is the second diagnosis strategy;
And under the condition that the second state information meets a second diagnosis enabling condition, diagnosing the inverter temperature information based on the second diagnosis strategy to obtain a diagnosis result aiming at the target temperature sensor.
7. The sensor diagnosis method according to claim 6, wherein the second status information includes first failure information of a motor controller and/or second failure information of the target temperature sensor;
The method further comprises the steps of:
And determining that the second state information meets the second diagnosis enabling condition under the condition that the first fault information indicates that the motor controller has no fault and/or the second fault information indicates that the target temperature sensor has no fault.
8. The sensor diagnostic method of claim 6, wherein the inverter temperature information comprises a first phase temperature, a second phase temperature, and a third phase temperature of the inverter;
Diagnosing the inverter temperature information based on the second diagnostic strategy, and obtaining a diagnostic result for the target temperature sensor, including:
Determining a third temperature difference between the first phase temperature and the second phase temperature, a fourth temperature difference between the first phase temperature and the third phase temperature, and a fifth temperature difference between the second phase temperature and the third phase temperature;
Determining that the diagnosis result is that the target temperature sensor is normal under the condition that the third temperature difference, the fourth temperature difference and the fifth temperature difference are smaller than or equal to a second temperature threshold value;
and determining that the diagnosis result is abnormal in the target temperature sensor when any one of the third temperature difference, the fourth temperature difference and the fifth temperature difference is greater than the second temperature threshold.
9. A computer-readable storage medium, on which an executable program is stored, characterized in that the executable program, when executed by a processor, implements the sensor diagnosis method according to any one of claims 1-8.
10. A vehicle, characterized by comprising:
A memory for storing an executable program;
A processor;
the sensor diagnostic method according to any one of claims 1-8, when said executable program is executed by said processor.
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