CN112202380A - Electric vehicle temperature protection method, electric vehicle controller and electric vehicle - Google Patents
Electric vehicle temperature protection method, electric vehicle controller and electric vehicle Download PDFInfo
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- CN112202380A CN112202380A CN202010904267.9A CN202010904267A CN112202380A CN 112202380 A CN112202380 A CN 112202380A CN 202010904267 A CN202010904267 A CN 202010904267A CN 112202380 A CN112202380 A CN 112202380A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention discloses an electric vehicle temperature protection method, a controller of an electric vehicle and the electric vehicle, wherein the electric vehicle temperature protection method comprises the following steps: comparing the motor temperature of the motor with a preset first temperature threshold, comparing the controller temperature of the controller with a preset second temperature threshold, selecting the minimum value as an adjusting reference value according to the motor temperature and the controller temperature under the condition that the motor temperature is greater than the first temperature threshold or the controller temperature is greater than the second temperature threshold, carrying out PI (proportional integral) adjustment on the phase current of the motor based on the adjusting reference value to obtain a target phase current, outputting the target phase current to the motor, and enabling the motor to obtain corresponding torque according to the target phase current, wherein the target phase current is less than or equal to the preset current threshold. Through the application, the problem that the running efficiency of the electric vehicle is low due to the fact that temperature protection is carried out on the motor and the controller is solved, and the running efficiency of the electric vehicle is improved.
Description
Technical Field
The invention relates to the technical field of electric vehicle control, in particular to an electric vehicle temperature protection method, an electric vehicle controller and an electric vehicle.
Background
The motor control of the electric vehicle is usually realized by performing vector control on the phase current, and when the phase current is a large current for a long time, the temperatures of the motor and the controller arranged on the electric vehicle are increased, so that the motor or the controller is easily damaged. In order to avoid damage to the motor or the controller caused by the above situations, in the related art, temperature protection of the motor and the controller is triggered by detecting the temperature of the controller and the temperature of the motor, once the temperature of the controller or the temperature of the motor reaches a preset temperature threshold value, the electric vehicle can be directly powered off to give an alarm, but the number of times of starting and stopping the electric vehicle is increased when the electric vehicle climbs a mountain area or runs in a city road section with a lot of traffic lights, and the running efficiency of the electric vehicle is low.
Aiming at the problem that the running efficiency of the electric vehicle is low due to the fact that temperature protection is carried out on a motor and a controller in the related technology, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the application provides an electric vehicle temperature protection method, a controller of an electric vehicle and the electric vehicle, and aims to at least solve the problem that the electric vehicle running efficiency is low due to the fact that temperature protection is carried out on a motor and the controller in the related technology.
In a first aspect, an embodiment of the present application provides a method for protecting temperature of an electric vehicle, where the method includes:
comparing the motor temperature of the motor with a preset first temperature threshold, comparing the controller temperature of the controller with a preset second temperature threshold, and selecting the minimum value as an adjusting reference value according to the motor temperature and the controller temperature under the condition that the motor temperature is greater than the first temperature threshold or the controller temperature is greater than the second temperature threshold;
and performing PI adjustment on the phase current of the motor based on the adjustment reference value to obtain a target phase current, outputting the target phase current to the motor, and enabling the motor to obtain corresponding torque according to the target phase current, wherein the target phase current is less than or equal to a preset current threshold.
In some embodiments, before comparing the motor temperature of the motor with the preset first temperature threshold, the method includes:
obtaining a pedal instruction of an electric vehicle to which the motor and the controller belong, wherein the pedal instruction comprises a voltage AD value of pedal work;
comparing the voltage AD value with a preset voltage threshold value;
and acquiring the motor temperature and the controller temperature when the voltage AD value is larger than or equal to the voltage threshold value.
In some embodiments, after comparing the controller temperature of the controller with the preset second temperature threshold, the method includes:
starting a detection timer when the motor temperature is less than or equal to the first temperature threshold and the controller temperature is less than or equal to the second temperature threshold;
acquiring the controller temperature of the controller within the designated time of the detection timer, and comparing the controller temperature with the second temperature threshold;
and performing PI adjustment on the phase current of the motor based on the controller temperature to obtain the target phase current when the controller temperature is greater than the second temperature threshold.
In some of these embodiments, after said comparing the controller temperature to the second temperature threshold, the method comprises:
and adjusting the phase current of the motor to the phase current corresponding to the maximum power level of the controller under the condition that the temperature of the controller is less than or equal to the second temperature threshold.
In some of these embodiments, after the starting of the detection timer, the method includes: and regulating the phase current of the motor to a preset normal working current threshold value under the condition that the execution time of PI regulation on the phase current of the motor exceeds the specified time.
In some embodiments, after the phase current of the motor is adjusted to the preset normal operating current threshold, the method further includes:
acquiring the controller temperature of the controller, and comparing the controller temperature with the second temperature threshold;
and performing PI adjustment on the phase current of the motor based on the controller temperature to obtain the target phase current when the controller temperature is greater than the second temperature threshold.
In some of these embodiments, after said comparing the controller temperature to the second temperature threshold, the method comprises:
and adjusting the phase current of the motor to the phase current corresponding to the maximum power level of the controller under the condition that the temperature of the controller is less than or equal to the second temperature threshold.
In a second aspect, an embodiment of the present application provides a controller of an electric vehicle, including a temperature measurement circuit, a temperature sensor and a main control chip, where the main control chip is connected to the temperature measurement circuit and the temperature sensor respectively, and the main control chip and the temperature sensor are connected to a motor on the electric vehicle to which the controller belongs respectively;
the temperature sensor is used for collecting the motor temperature of the motor;
the temperature measuring circuit is used for collecting the controller temperature of the controller;
the main control chip is configured to obtain the motor temperature and the controller temperature, and execute the method for protecting the temperature of the electric vehicle according to the first aspect.
In some embodiments, the temperature measuring circuit includes a resistance-capacitance filter circuit and a controller temperature sensor, and the controller temperature sensor is connected to the main control chip through the resistance-capacitance filter circuit.
In a third aspect, an embodiment of the present application provides an electric vehicle, which includes a motor and the controller as described in the second aspect, where the motor is connected to the controller;
the controller is used for acquiring phase current of the motor, adjusting the phase current of the motor according to the motor temperature of the motor and the controller temperature of the controller, and sending the adjusted phase current to the motor;
and the motor is used for obtaining corresponding torque according to the adjusted phase current.
Compared with the prior art, according to the electric vehicle temperature protection method provided by the embodiment of the application, the motor temperature of the motor is compared with the preset first temperature threshold, the controller temperature of the controller is compared with the preset second temperature threshold, the minimum value is selected as the regulation reference value according to the motor temperature and the controller temperature under the condition that the motor temperature is greater than the first temperature threshold or the controller temperature is greater than the second temperature threshold, the phase current of the motor is subjected to PI regulation based on the regulation reference value to obtain the target phase current, the target phase current is output to the motor, the motor obtains the corresponding torque according to the target phase current, and the target phase current is smaller than or equal to the preset current threshold, so that the problem that the electric vehicle running efficiency is low due to the fact that the temperature protection is performed on the motor and the controller is solved, and the running efficiency of the electric vehicle is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram of an application environment of a temperature protection method for an electric vehicle according to an embodiment of the application;
FIG. 2 is a flow chart of a method for temperature protection of an electric vehicle according to an embodiment of the present application;
FIG. 3 is a flow chart of another method for temperature protection of an electric vehicle according to an embodiment of the present application;
FIG. 4 is a schematic flow chart diagram of a method for protecting the temperature of an electric vehicle according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a controller of an electric vehicle according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments provided in the present application without any inventive step are within the scope of protection of the present application.
It is obvious that the drawings in the following description are only examples or embodiments of the present application, and that it is also possible for a person skilled in the art to apply the present application to other similar contexts on the basis of these drawings without inventive effort. Moreover, it should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions must be made to achieve the developers' specific goals, such as compliance with system-related and business-related constraints, which may vary from one implementation to another.
Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of ordinary skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments without conflict.
Unless defined otherwise, technical or scientific terms referred to herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which this application belongs. Reference to "a," "an," "the," and similar words throughout this application are not to be construed as limiting in number, and may refer to the singular or the plural. The present application is directed to the use of the terms "including," "comprising," "having," and any variations thereof, which are intended to cover non-exclusive inclusions; for example, a process, method, system, article, or apparatus that comprises a list of steps or modules (elements) is not limited to the listed steps or elements, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus. Reference to "connected," "coupled," and the like in this application is not intended to be limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The term "plurality" as referred to herein means two or more. "and/or" describes an association relationship of associated objects, meaning that three relationships may exist, for example, "A and/or B" may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. Reference herein to the terms "first," "second," "third," and the like, are merely to distinguish similar objects and do not denote a particular ordering for the objects.
Fig. 1 is a schematic view of an application environment of a method for protecting a temperature of an electric vehicle according to an embodiment of the present application, and the method for protecting a temperature of an electric vehicle provided by the present application can be applied to the application environment shown in fig. 1. The motor controller is a controller installed on the electric vehicle, and the controller can perform segmented control on the phase current of the motor installed on the electric vehicle. The controller regulates the phase current of the limiting motor through the linear PI according to the motor temperature of the motor and the controller temperature of the controller, so that the phase current skips a large-current demand section of the motor, the motor torque response is met, the problem that the running efficiency of the electric vehicle is low due to the fact that the temperature protection is carried out on the motor and the controller is solved, the running efficiency of the electric vehicle is improved, the cruising mileage of the electric vehicle can be increased, and the safety of the electric vehicle is improved.
The embodiment provides a method for protecting the temperature of an electric vehicle, and fig. 2 is a flowchart of the method for protecting the temperature of an electric vehicle according to the embodiment of the application, and as shown in fig. 2, the flowchart includes the following steps:
s210, comparing the motor temperature of the motor with a preset first temperature threshold value. The first temperature threshold may be determined according to a motor power level actually used by the electric vehicle.
And S220, if the motor temperature is greater than the first temperature threshold value, selecting the minimum value as an adjusting reference value according to the motor temperature and the controller temperature of the controller.
And S230, if the temperature of the motor is less than or equal to the first temperature threshold, comparing the controller temperature of the controller with a preset second temperature threshold. The first temperature threshold may be determined according to a controller power level actually used by the electric vehicle.
And S240, if the temperature of the controller is greater than the second temperature threshold value, selecting the minimum value as an adjusting reference value according to the temperature of the motor and the temperature of the controller.
Through steps S220 to S240, when the motor temperature is greater than the first temperature threshold or the controller temperature is greater than the second temperature threshold, a motor limitation result is obtained based on the inverse temperature ratio limitation according to the motor temperature, a controller limitation result is obtained based on the inverse temperature ratio limitation according to the controller temperature, and the minimum value is selected from the motor limitation result and the controller limitation result as the adjustment reference value.
And S250, carrying out PI adjustment on the phase current of the motor based on the adjustment reference value to obtain a target phase current, and outputting the target phase current to the motor. The target phase current is less than or equal to a preset current threshold, the current threshold meets the requirement of the electric vehicle on the torque of the motor during slow running, and the motor can obtain corresponding torque according to the target phase current.
When the phase current of the motor is a large current for a long time, under the condition that the temperature of the motor or the temperature of the controller is detected to exceed a preset temperature threshold, the temperature protection method of the electric vehicle does not trigger the power-off of the electric vehicle to prevent the motor or the controller from being damaged, but obtains an adjusting reference value according to the temperature of the motor and the temperature of the controller. And performing linear PI regulation limitation on the phase current of the motor based on the regulation reference value, and regulating the phase current with a larger value to a target phase current. This target phase current protects stably under the prerequisite that satisfies motor torque response for the motor is comparatively slow in the operation before phase current adjustment, still can guarantee that the electric motor car is in the state of traveling, thereby has reduced opening of electric motor car and has stopped the number of times, has solved and has carried out the problem that temperature protection can lead to electric motor car operating efficiency to motor and controller to hang, has improved the operating efficiency of electric motor car. And the power consumption of the electric vehicle caused by the starting and stopping times can be reduced, the endurance mileage of the electric vehicle can be increased, road accidents caused by frequent starting and stopping can be avoided, and the safety is improved.
In some embodiments, before comparing the motor temperature with a preset first temperature threshold, a pedal instruction of the electric vehicle to which the motor and the controller belong is obtained, and the pedal instruction comprises a voltage AD value of pedal work. And comparing the voltage AD value with a preset voltage threshold value. The voltage threshold may be determined according to the output range of the pedal accessory itself of the electric vehicle, and is generally 0.8V to 1.1V. It is to be noted that the voltage threshold is not limited to the above-mentioned voltage values. And under the condition that the voltage AD value is smaller than the voltage threshold value, the phase current is not output to the motor, the pedal instruction is not enough to drive the motor to run, and the electric vehicle is static. Under the condition that the voltage AD value is larger than or equal to the voltage threshold value, the pedal instruction can drive the motor to run, the electric vehicle is in a running state, and the motor temperature and the controller temperature are acquired at the moment. The timeliness of adjusting the phase current of the motor can be ensured by acquiring the temperature of the motor and the temperature of the controller in real time in the running state of the electric vehicle.
The present embodiment provides another method for protecting the temperature of an electric vehicle, and fig. 3 is a flowchart of another method for protecting the temperature of an electric vehicle according to an embodiment of the present application, and as shown in fig. 3, the flowchart includes the following steps:
s310, comparing the motor temperature of the motor with a preset first temperature threshold value, and comparing the controller temperature of the controller with a preset second temperature threshold value.
And S320, starting a detection timer when the temperature of the motor is less than or equal to the first temperature threshold and the temperature of the controller is less than or equal to the second temperature threshold.
S330, acquiring the controller temperature of the controller within the designated time of the detection timer, and comparing the controller temperature with a second temperature threshold value.
And S340, performing PI adjustment on the phase current of the motor based on the controller temperature to obtain a target phase current under the condition that the controller temperature is greater than the second temperature threshold.
Under the condition that the temperatures of the motor and the controller do not exceed a preset temperature threshold, within the specified time of the detection timer, the controller temperature of the controller is limited based on the inverse temperature ratio to obtain a controller limiting result, the controller limiting result is used as an adjusting reference value, the phase current of the motor is limited by linear PI adjustment, the phase current of the motor is adjusted to a target phase current, the operation efficiency and the safety of the electric vehicle are improved, and the endurance mileage of the electric vehicle is increased.
In some embodiments, in the case that the temperature of the controller is less than or equal to the second temperature threshold within the specified time of the detection timer, the phase current of the motor is adjusted to the phase current corresponding to the maximum power level of the controller, so that the operation efficiency and safety of the electric vehicle can be improved, and the driving range of the electric vehicle can be increased.
In some embodiments, after comparing the controller temperature of the controller with a preset second temperature threshold, the detection timer is started if the motor temperature is less than or equal to the first temperature threshold and the controller temperature is less than or equal to the second temperature threshold. And when the execution time of PI adjustment on the phase current of the motor exceeds the specified time of the detection timer, namely the phase current of the motor is not adjusted within the specified time, the phase current of the motor is adjusted to a preset normal working current threshold value. The normal working current threshold value meets the requirement of normal running of the electric vehicle on the motor torque.
Although the phase current of the motor is not adjusted within the designated time, the phase current of the motor can be limited under the normal working current threshold value through the method, so that the phase current cannot be a long-time large current, the temperature rise of the motor or a controller is slowed down, the normal running of the electric vehicle is further ensured, the running efficiency of the electric vehicle is further improved, and the endurance mileage of the electric vehicle is increased or decreased.
In some embodiments, after the phase current of the motor is adjusted to the preset normal operating current threshold, the controller temperature of the controller is obtained, and the controller temperature is compared with the second temperature threshold. And under the condition that the temperature of the controller is greater than a second temperature threshold value, carrying out PI adjustment on the phase current of the motor based on the temperature of the controller to obtain a target phase current. And adjusting the phase current of the motor to the phase current corresponding to the maximum power level of the controller under the condition that the temperature of the controller is less than or equal to the second temperature threshold value. The phase current is controlled in a segmented manner at a proper stage by combining the temperature of the controller, so that the torque response of the motor can be met, the phase current is kept stable, the running efficiency and the safety of the electric vehicle are improved, and the endurance mileage of the electric vehicle is increased.
In some embodiments, fig. 4 is a flowchart illustrating a method for protecting temperature of an electric vehicle according to an embodiment of the present application, and as shown in fig. 4, a voltage AD value in a pedal command is first detected and compared with a preset voltage threshold. If the voltage AD is larger than or equal to the voltage threshold value, the phase current is not output. And if the voltage AD value is smaller than the voltage threshold, detecting the motor temperature of the motor, and comparing the motor temperature with a preset first temperature threshold. If the motor temperature is larger than the first temperature threshold value, obtaining a motor limiting result based on temperature inverse ratio limitation according to the motor temperature, obtaining a controller limiting result based on temperature inverse ratio limitation according to the controller temperature, selecting a smaller value from the motor limiting result and the controller limiting result as an adjusting reference value, carrying out PI (proportional integral) adjustment limitation on the phase current of the motor according to the adjusting reference value, and obtaining and outputting a target phase current.
And if the temperature of the motor is less than or equal to the first temperature threshold, detecting the temperature of a controller of the controller, and comparing the temperature of the controller with a preset second temperature threshold. If the temperature of the controller is larger than the second temperature threshold value, a controller limiting result is obtained according to the temperature of the controller based on temperature inverse ratio limitation, a motor limiting result is obtained according to the temperature of the motor based on temperature inverse ratio limitation, a smaller value is selected from the motor limiting result and the controller limiting result to serve as an adjusting reference value, PI adjusting limitation is carried out on the phase current of the motor according to the adjusting reference value, and the target phase current is obtained and output.
And if the temperature of the controller is less than or equal to the second temperature threshold value, starting a detection timer. And within the specified time of the detection timer, when the temperature of the controller is greater than a second temperature threshold value, obtaining a controller limiting result according to the temperature of the controller based on temperature inverse ratio limitation, and carrying out PI regulation limitation on the phase current of the motor according to the controller limiting result to obtain and output a target phase current. And adjusting the phase current of the motor to the phase current corresponding to the maximum power level of the controller when the temperature of the controller is less than or equal to the second temperature threshold within the designated time of the detection timer.
And when the execution time for adjusting the phase current of the motor exceeds the specified time of the detection timer, namely the phase current of the motor is not adjusted within the specified time, adjusting the phase current of the motor to a preset normal working current threshold value, and executing the detection of the controller temperature of the controller.
According to the invention, according to the motor temperature of the motor and the controller temperature of the controller, the phase current of the motor is limited through PI regulation, so that the phase current skips a large-current demand section of the motor, the torque response of the motor is satisfied, the problem of low running efficiency of the electric vehicle caused by temperature protection of the motor and the controller is solved, the running efficiency of the electric vehicle is improved, the cruising mileage of the electric vehicle can be increased, and the safety of the electric vehicle is improved.
This embodiment also provides a controller of an electric vehicle, fig. 5 is a schematic structural diagram of the controller of the electric vehicle according to the embodiment of the present application, and as shown in fig. 5, the temperature measuring circuit of the controller, the temperature sensor and the main control chip are respectively connected to the temperature measuring circuit and the temperature sensor, and the main control chip and the temperature sensor are respectively connected to a motor on the electric vehicle to which the controller belongs. The temperature sensor is used for acquiring the motor temperature of the motor; the temperature measuring circuit is used for acquiring the controller temperature of the controller; the main control chip is used for obtaining the motor temperature and the controller temperature and executing the steps in any method embodiment, so that the phase current of the motor is adjusted according to the motor temperature and the controller temperature, and the adjusted phase current is sent to the motor, so that the motor obtains corresponding torque according to the adjusted phase current.
In this embodiment, the main control chip adopts RX 62T. A pin 7 and a pin 30 of the main control chip are connected with a temperature sensor, a pin 33 of the main control chip is connected with a temperature measuring circuit, a pin 1 of the main control chip is connected with a key switch, a pin 12, a pin 23 and a pin 35 of the main control chip are connected with 8 pulse rotating speed signals, a pin 8, a pin 19, a pin 20 and a pin 31 of the main control chip are connected with an electronic throttle, a pin 26 of the main control chip is connected with a brake switch and a brake lamp, a pin 27 of the main control chip is connected with a vehicle-mounted DC ground wire, and a pin 6, a pin 17, a pin 18 and a pin 29 of.
In some embodiments, in order to avoid the interference signal from affecting the controller temperature acquisition signal, the temperature measurement circuit includes a resistance-capacitance filter circuit and a controller temperature sensor, the controller temperature sensor is connected to the pin 33 of the main control chip through the resistance-capacitance filter circuit, the interference signal is filtered by adding the resistance-capacitance filter circuit, and the accurate acquisition of the controller temperature can be realized by combining with software filtering processing. The resistance-capacitance filter circuit comprises a resistor and a capacitor which are connected in series, a node between the resistor and the capacitor is connected with a pin 33 of the main control chip, and the capacitor is grounded.
Those skilled in the art will appreciate that the configuration shown in fig. 5 is a block diagram of only a portion of the configuration associated with the present application and does not constitute a limitation on the controller to which the present application is applied, and that a particular controller may include more or fewer components than those shown, or combine certain components, or have a different arrangement of components.
The embodiment also provides an electric vehicle which comprises a motor and the controller in any one of the above method embodiments, wherein the motor is connected with the controller. The controller obtains the phase current of the motor, adjusts the phase current of the motor according to the motor temperature of the motor and the controller temperature of the controller, and sends the adjusted phase current to the motor, and the motor obtains corresponding torque according to the adjusted phase current, so that the running efficiency and safety of the electric vehicle are improved, and the cruising mileage of the electric vehicle is increased.
It should be understood by those skilled in the art that various features of the above-described embodiments can be combined in any combination, and for the sake of brevity, all possible combinations of features in the above-described embodiments are not described in detail, but rather, all combinations of features which are not inconsistent with each other should be construed as being within the scope of the present disclosure.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for temperature protection of an electric vehicle, the method comprising:
comparing the motor temperature of the motor with a preset first temperature threshold, comparing the controller temperature of the controller with a preset second temperature threshold, and selecting the minimum value as an adjusting reference value according to the motor temperature and the controller temperature under the condition that the motor temperature is greater than the first temperature threshold or the controller temperature is greater than the second temperature threshold;
and performing PI adjustment on the phase current of the motor based on the adjustment reference value to obtain a target phase current, outputting the target phase current to the motor, and enabling the motor to obtain corresponding torque according to the target phase current, wherein the target phase current is less than or equal to a preset current threshold.
2. The method of claim 1, wherein prior to comparing the motor temperature of the motor to the preset first temperature threshold, the method comprises:
obtaining a pedal instruction of an electric vehicle to which the motor and the controller belong, wherein the pedal instruction comprises a voltage AD value of pedal work;
comparing the voltage AD value with a preset voltage threshold value;
and acquiring the motor temperature and the controller temperature when the voltage AD value is larger than or equal to the voltage threshold value.
3. The method of claim 1, wherein after comparing the controller temperature of the controller to a preset second temperature threshold, the method comprises:
starting a detection timer when the motor temperature is less than or equal to the first temperature threshold and the controller temperature is less than or equal to the second temperature threshold;
acquiring the controller temperature of the controller within the designated time of the detection timer, and comparing the controller temperature with the second temperature threshold;
and performing PI adjustment on the phase current of the motor based on the controller temperature to obtain the target phase current when the controller temperature is greater than the second temperature threshold.
4. The method of claim 3, wherein after comparing the controller temperature to the second temperature threshold, the method comprises:
and adjusting the phase current of the motor to the phase current corresponding to the maximum power level of the controller under the condition that the temperature of the controller is less than or equal to the second temperature threshold.
5. The method of claim 3, wherein after the starting of the detection timer, the method comprises: and regulating the phase current of the motor to a preset normal working current threshold value under the condition that the execution time of PI regulation on the phase current of the motor exceeds the specified time.
6. The method of claim 5, wherein after the phase current of the motor is adjusted down to a preset normal operating current threshold, the method further comprises:
acquiring the controller temperature of the controller, and comparing the controller temperature with the second temperature threshold;
and performing PI adjustment on the phase current of the motor based on the controller temperature to obtain the target phase current when the controller temperature is greater than the second temperature threshold.
7. The method of claim 6, wherein after comparing the controller temperature to the second temperature threshold, the method comprises:
and adjusting the phase current of the motor to the phase current corresponding to the maximum power level of the controller under the condition that the temperature of the controller is less than or equal to the second temperature threshold.
8. The controller of the electric vehicle is characterized by comprising a temperature measuring circuit, a temperature sensor and a main control chip, wherein the main control chip is respectively connected with the temperature measuring circuit and the temperature sensor, and the main control chip and the temperature sensor are respectively connected with a motor on the electric vehicle to which the controller belongs;
the temperature sensor is used for collecting the motor temperature of the motor;
the temperature measuring circuit is used for collecting the controller temperature of the controller;
the main control chip is used for acquiring the motor temperature and the controller temperature and executing the electric vehicle temperature protection method according to any one of claims 1 to 7.
9. The controller of claim 8, wherein the temperature measuring circuit comprises a resistance-capacitance filter circuit and a controller temperature sensor, and the controller temperature sensor is connected with the main control chip through the resistance-capacitance filter circuit.
10. An electric vehicle comprising an electric motor and the controller of claim 8, the electric motor being connected to the controller;
the controller is used for acquiring phase current of the motor, adjusting the phase current of the motor according to the motor temperature of the motor and the controller temperature of the controller, and sending the adjusted phase current to the motor;
and the motor is used for obtaining corresponding torque according to the adjusted phase current.
Priority Applications (1)
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| CN112202380B (en) | 2022-05-20 |
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