CN117175759B - Charging circuit, method, device, vehicle and storage medium for low-voltage battery - Google Patents

Charging circuit, method, device, vehicle and storage medium for low-voltage battery Download PDF

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CN117175759B
CN117175759B CN202311445104.9A CN202311445104A CN117175759B CN 117175759 B CN117175759 B CN 117175759B CN 202311445104 A CN202311445104 A CN 202311445104A CN 117175759 B CN117175759 B CN 117175759B
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module
output
target
charging
actual
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CN117175759A (en
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王鹏
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Xiaomi Automobile Technology Co Ltd
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Xiaomi Automobile Technology Co Ltd
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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
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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Abstract

The disclosure relates to a charging circuit, a charging method, a charging device, a charging vehicle and a charging medium of a low-voltage battery, and belongs to the technical field of batteries. The charging circuit of the low-voltage battery comprises a first winding of the motor, a second winding of the motor, a rectifying module and a whole vehicle controller, wherein the first winding and the second winding are mutually coupled, energy transmission can be carried out between the first winding and the second winding, the input end of the rectifying module is connected with the first winding, the output end of the rectifying module is connected with the low-voltage battery, and the actual output torque of the rectifying module is negative torque. Therefore, the mutual coupling between the motor windings can be utilized to realize energy transmission between the motor windings so as to realize the charging of the low-voltage battery, improve the integration level of a charging circuit of the low-voltage battery and be beneficial to reducing the charging cost of the low-voltage battery.

Description

Charging circuit, method, device, vehicle and storage medium for low-voltage battery
Technical Field
The disclosure relates to the technical field of batteries, and in particular relates to a charging circuit, a charging method, a charging device, a charging vehicle and a charging storage medium for a battery.
Background
At present, most vehicles are provided with a high-voltage battery and a low-voltage battery, wherein the high-voltage battery is used for supplying power to a high-voltage load, and the low-voltage battery is used for supplying power to a low-voltage load. In the charging circuits of the low-voltage batteries in the related art, an independent DC-DC (Direct Current-Direct Current) converter is mostly adopted to convert the electric energy of the high-voltage battery into low-voltage electric energy so as to realize the charging of the low-voltage battery, and the problems of low circuit integration level and high charging cost of the low-voltage battery exist.
Disclosure of Invention
The disclosure provides a charging circuit, a method, a device, a vehicle and a computer readable storage medium for a low-voltage battery, which at least solve the problems of low integration level of the charging circuit of the low-voltage battery and high charging cost of the low-voltage battery in the related art. The technical scheme of the present disclosure is as follows:
according to a first aspect of embodiments of the present disclosure, there is provided a charging circuit of a low-voltage battery, including: the motor comprises a first winding of a motor, a second winding of the motor, a rectifying module and a whole vehicle controller; the first winding and the second winding are mutually coupled, energy transmission can be carried out between the first winding and the second winding, the input end of the rectifying module is connected with the first winding, the output end of the rectifying module is connected with the low-voltage battery, and the actual output torque of the rectifying module is negative torque.
In one embodiment of the present disclosure, further comprising: a first driving module; the output end of the first driving module is connected with the driving end of the rectifying module.
In one embodiment of the present disclosure, further comprising: an inverter module and a high-voltage battery; the input end of the inversion module is connected with the high-voltage battery, and the output end of the inversion module is connected with the second winding.
In one embodiment of the present disclosure, further comprising: a second driving module; the output end of the second driving module is connected with the driving end of the inversion module.
According to a second aspect of the embodiments of the present disclosure, a charging method for a low-voltage battery is provided, where a charging circuit for the low-voltage battery includes a first winding of a motor, a second winding of the motor, a rectifying module, and a vehicle controller, where the first winding and the second winding are coupled to each other, energy transmission can be performed between the first winding and the second winding, an input end of the rectifying module is connected with the first winding, an output end of the rectifying module is connected with the low-voltage battery, and an actual output torque of the rectifying module is a negative torque;
the method comprises the following steps: acquiring a charging signal output by the whole vehicle controller, wherein the charging signal is used for indicating a target charging parameter of the low-voltage battery; and adjusting the actual output parameter of the rectifying module based on the target charging parameter, wherein the actual output parameter of the rectifying module is the actual charging parameter of the low-voltage battery.
In one embodiment of the disclosure, the adjusting the actual output parameter of the rectifying module based on the target charging parameter includes: collecting actual output parameters of the rectifying module; and adjusting the actual output parameter of the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module.
In one embodiment of the disclosure, the adjusting the actual output parameter of the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module includes: obtaining a target direct-axis current and a target quadrature-axis current output by the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module; and adjusting the actual output parameters of the rectifying module based on the target direct-axis current and the target quadrature-axis current output by the rectifying module.
In one embodiment of the present disclosure, the target direct current output by the rectifying module is zero.
In one embodiment of the disclosure, the charging circuit of the low-voltage battery further comprises a first driving module, wherein an output end of the first driving module is connected with a driving end of the rectifying module;
the adjusting the actual output parameter of the rectifying module based on the target direct-axis current and the target quadrature-axis current output by the rectifying module includes: based on the actual output parameters of the rectifying module, obtaining the actual direct-axis current and the actual quadrature-axis current output by the rectifying module; obtaining a driving signal output by the first driving module based on the actual direct-axis current and the actual quadrature-axis current output by the rectifying module and the target direct-axis current and the target quadrature-axis current output by the rectifying module; and controlling the on-off of a switch in the rectifying module based on a driving signal output by the first driving module so as to adjust the actual output parameter of the rectifying module.
In one embodiment of the disclosure, the charging circuit of the low-voltage battery further comprises an inverter module and a high-voltage battery, wherein an input end of the inverter module is connected with the high-voltage battery, and an output end of the inverter module is connected with the second winding;
the method further comprises the steps of: acquiring a torque signal output by the whole vehicle controller, wherein the torque signal is used for indicating the target output torque of the motor; and adjusting the actual output parameters of the inverter module based on the target output torque of the motor so as to adjust the actual output torque of the inverter module.
In one embodiment of the present disclosure, the adjusting the actual output parameter of the inverter module based on the target output torque of the motor includes: acquiring the actual output torque of the rectifying module; acquiring the absolute value of the actual output torque of the rectifying module and the sum of the target output torque of the motor as the target output torque of the inversion module; and adjusting the actual output parameters of the inversion module based on the target output torque of the inversion module.
According to a third aspect of the embodiments of the present disclosure, a charging device for a low-voltage battery is provided, where a charging circuit for the low-voltage battery includes a first winding of a motor, a second winding of the motor, a rectifying module, and a vehicle controller, where the first winding and the second winding are coupled to each other, energy transmission can be performed between the first winding and the second winding, an input end of the rectifying module is connected with the first winding, an output end of the rectifying module is connected with the low-voltage battery, and an actual output torque of the rectifying module is a negative torque;
The device comprises: the acquisition module is configured to acquire a charging signal output by the whole vehicle controller, wherein the charging signal is used for indicating a target charging parameter of the low-voltage battery; and the adjusting module is configured to perform adjustment on the actual output parameter of the rectifying module based on the target charging parameter, wherein the actual output parameter of the rectifying module is the actual charging parameter of the low-voltage battery.
In one embodiment of the present disclosure, the adjustment module is further configured to perform: collecting actual output parameters of the rectifying module; and adjusting the actual output parameter of the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module.
In one embodiment of the present disclosure, the adjustment module is further configured to perform: obtaining a target direct-axis current and a target quadrature-axis current output by the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module; and adjusting the actual output parameters of the rectifying module based on the target direct-axis current and the target quadrature-axis current output by the rectifying module.
In one embodiment of the present disclosure, the target direct current output by the rectifying module is zero.
In one embodiment of the disclosure, the charging circuit of the low-voltage battery further comprises a first driving module, wherein an output end of the first driving module is connected with a driving end of the rectifying module;
the adjustment module is further configured to perform: based on the actual output parameters of the rectifying module, obtaining the actual direct-axis current and the actual quadrature-axis current output by the rectifying module; obtaining a driving signal output by the first driving module based on the actual direct-axis current and the actual quadrature-axis current output by the rectifying module and the target direct-axis current and the target quadrature-axis current output by the rectifying module; and controlling the on-off of a switch in the rectifying module based on a driving signal output by the first driving module so as to adjust the actual output parameter of the rectifying module.
In one embodiment of the disclosure, the charging circuit of the low-voltage battery further comprises an inverter module and a high-voltage battery, wherein an input end of the inverter module is connected with the high-voltage battery, and an output end of the inverter module is connected with the second winding;
The adjustment module is further configured to perform: acquiring a torque signal output by the whole vehicle controller, wherein the torque signal is used for indicating the target output torque of the motor; and adjusting the actual output parameters of the inverter module based on the target output torque of the motor so as to adjust the actual output torque of the inverter module.
In one embodiment of the present disclosure, the adjustment module is further configured to perform: acquiring the actual output torque of the rectifying module; acquiring the absolute value of the actual output torque of the rectifying module and the sum of the target output torque of the motor as the target output torque of the inversion module; and adjusting the actual output parameters of the inversion module based on the target output torque of the inversion module.
According to a fourth aspect of embodiments of the present disclosure, there is provided a vehicle comprising a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the steps of the method according to the first aspect of the embodiments of the present disclosure.
According to a fifth aspect of the disclosed embodiments, there is provided a computer readable storage medium having stored thereon computer program instructions which when executed by a processor implement the steps of the method of the first aspect of the disclosed embodiments.
The technical scheme provided by the embodiment of the disclosure at least brings the following beneficial effects: the mutual coupling between the motor windings can be utilized to realize energy transmission between the motor windings so as to realize the charging of the low-voltage battery, improve the integration level of a charging circuit of the low-voltage battery and be beneficial to reducing the charging cost of the low-voltage battery.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure and do not constitute an undue limitation on the disclosure.
Fig. 1 is a block diagram illustrating a charging circuit of a low-voltage battery according to an exemplary embodiment.
Fig. 2 is a block diagram illustrating a charging circuit of a low-voltage battery according to another exemplary embodiment.
Fig. 3 is a block diagram illustrating a charging circuit of a low-voltage battery according to another exemplary embodiment.
Fig. 4 is a schematic diagram illustrating a charging method of a low-voltage battery according to an exemplary embodiment.
Fig. 5 is a flowchart illustrating a charging method of a low-voltage battery according to another exemplary embodiment.
Fig. 6 is a flowchart illustrating a charging method of a low-voltage battery according to another exemplary embodiment.
Fig. 7 is a block diagram illustrating a charging device of a low-voltage battery according to an exemplary embodiment.
Fig. 8 is a block diagram of a vehicle, according to an exemplary embodiment.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings.
It should be noted that the terms "first," "second," and the like in the description and claims of the present disclosure and in the foregoing figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the disclosure described herein may be capable of operation in sequences other than those illustrated or described herein. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with some aspects of the present disclosure as detailed in the accompanying claims.
Fig. 1 is a block diagram illustrating a charging circuit of a low-voltage battery according to an exemplary embodiment, and as shown in fig. 1, a charging circuit 100 of a low-voltage battery according to an embodiment of the present disclosure includes a first winding 1 of a motor, a second winding 2 of the motor, a rectifying module 3, and a VCU (Vehicle Control Unit, vehicle controller) 4. The first winding 1 and the second winding 2 are coupled with each other, energy transmission can be performed between the first winding 1 and the second winding 2, the input end of the rectifying module 3 is connected with the first winding 1, the output end of the rectifying module 3 is connected with the low-voltage battery 5, and the actual output torque of the rectifying module 3 is negative torque.
In one embodiment, as shown in fig. 3, the first winding 1 and the second winding 2 are three-phase windings, and the turns ratio of the turns of the first winding 1 to the turns of the second winding 2 is not limited to 1:96.
In one embodiment, taking fig. 1 as an example, the output of the vehicle control unit 4 is connected to the drive end of the rectifier module 3.
It should be noted that, energy transmission between the first winding 1 and the second winding 2 may be performed based on the electromagnetic induction principle. The actual output torque of the rectifying module 3 is negative torque, that is, the energy in the second winding 2 can be transmitted to the first winding 1 based on the electromagnetic induction principle, and the energy in the first winding 1 is transmitted to the low-voltage battery 5 through the rectifying module 3 to charge the low-voltage battery 5.
According to the charging circuit of the low-voltage battery, the mutual coupling between the motor windings can be utilized to realize energy transmission between the motor windings so as to realize charging of the low-voltage battery, the integration level of the charging circuit of the low-voltage battery is improved, and the charging cost of the low-voltage battery is reduced.
In one embodiment, as shown in fig. 2, the charging circuit 100 of the low-voltage battery further includes a first driving module 6, wherein an output terminal of the first driving module 6 is connected to the driving terminal of the rectifying module 3. It should be noted that the driving signal output by the first driving module 6 is used to control on or off of the switch in the rectifying module 3, so as to adjust the actual output parameter of the rectifying module 3.
In one embodiment, taking fig. 2 as an example, the output of the vehicle control unit 4 is connected to the input of the first drive module 6.
In one embodiment, as shown in fig. 2, the charging circuit 100 for a low-voltage battery further includes an inverter module 7 and a high-voltage battery 8, wherein an input terminal of the inverter module 7 is connected to the high-voltage battery 8, and an output terminal of the inverter module 7 is connected to the second winding 2. The energy in the high-voltage battery 8 can be transmitted to the second winding 2 through the inversion module 7, the energy in the second winding 2 is transmitted to the first winding 1 based on the electromagnetic induction principle, and the energy in the first winding 1 is transmitted to the low-voltage battery 5 through the rectification module 3 so as to charge the low-voltage battery 5, namely, the high-voltage battery 8 is used for charging the low-voltage battery 5.
In one embodiment, as shown in fig. 2, the charging circuit 100 of the low-voltage battery further includes a second driving module 9, wherein an output terminal of the second driving module 9 is connected to a driving terminal of the inverter module 7. It should be noted that the driving signal output by the second driving module 9 is used to control on or off of the switch in the inverter module 7, so as to adjust the actual output parameter of the inverter module 7.
In one embodiment, taking fig. 2 as an example, the output of the vehicle control unit 4 is connected to the input of the second drive module 9.
It should be noted that the rectifying module 3 is not limited thereto, and for example, the rectifying module 3 may include a three-phase rectifier (e.g., a three-phase bridge rectifier, a three-phase half-wave rectifier). For example, as shown in fig. 3, the rectifying module 3 is a three-phase bridge rectifier.
It should be noted that the inverter module 7 is not limited thereto, and for example, the inverter module 7 may include a three-phase inverter (e.g., a three-phase bridge inverter, a three-phase half-wave inverter). For example, as shown in fig. 3, the inverter module 7 is a three-phase bridge rectifier.
The voltage of the high-voltage battery 8 is 760V (volts) and the voltage of the low-voltage battery 5 is 12V (volts), for example, without excessively limiting the voltage of the high-voltage battery 8 and the low-voltage battery 5.
The first drive module 6 and the second drive module 9 are not limited to any particular one.
For example, as shown in fig. 3, the first driving module 6 includes a control unit a, a control unit B, a detection unit a, and an arithmetic unit. The output of the control unit B is connected to the drive end of the rectifying module 3 (not shown in the figure). For the relevant content of each unit, see the following embodiments, which are not described herein.
For example, as shown in fig. 3, the second driving module 9 includes an MTPA (Maximum Torque per Ampere, maximum torque to current ratio) unit, a detecting unit B, and a control unit C. An output terminal of the control unit C is connected to a driving terminal of the inverter module 7 (not shown in the drawing). For the relevant content of each unit, see the following embodiments, which are not described herein.
In FIG. 3, ""is used to denote an arithmetic unit, and for example, may be used to denote an addition unit, a comparison unit, a subtraction unit, and the like, and is not excessively limited herein.
Note that the charging circuit of the low-voltage battery shown in fig. 1 to 3 is merely an example of the charging circuit of the low-voltage battery according to the embodiments of the present disclosure, and is not limited to the charging circuit of the low-voltage battery according to the embodiments of the present disclosure. The charging circuit of the low-voltage battery shown in fig. 1 to 3 is suitable for the charging method of the low-voltage battery shown in fig. 4 to 6.
Fig. 4 is a flowchart illustrating a method of charging a low-voltage battery according to an exemplary embodiment, and as shown in fig. 4, the method of charging a low-voltage battery according to an embodiment of the present disclosure includes the following steps.
S401, acquiring a charging signal output by the vehicle controller, wherein the charging signal is used for indicating a target charging parameter of the low-voltage battery.
It should be noted that, the implementation main body of the charging method of the low-voltage battery in the embodiment of the disclosure is an electronic device, and the electronic device includes a mobile phone, a notebook computer, a desktop computer, a vehicle-mounted terminal (such as a vehicle-mounted wireless module), an intelligent household appliance, and the like. The charging method of the low-voltage battery according to the embodiment of the present disclosure may be performed by the charging device of the low-voltage battery according to the embodiment of the present disclosure, and the charging device of the low-voltage battery according to the embodiment of the present disclosure may be configured in any electronic device to perform the charging method of the low-voltage battery according to the embodiment of the present disclosure.
The generation of the charging signal may be implemented by any method for generating a charging signal for a low-voltage battery in the related art, which is not limited herein.
It should be noted that the target charging parameter is not limited too much, and may include, for example, a target charging current, a target charging voltage, and the like.
In one embodiment, a charging signal is generated if the charging condition of the low voltage battery is currently met. It should be noted that the charging condition Of the low-voltage battery is not limited too much, and for example, it may include that the SOC (State Of Charge) Of the low-voltage battery is smaller than a set threshold value, and/or the current time reaches the charging time Of the low-voltage battery, or the like.
In one embodiment, the target charging parameters may be preset.
In one embodiment, the target charging parameter may be determined based on the SOC of the low-voltage battery.
S402, adjusting the actual output parameter of the rectifying module based on the target charging parameter, wherein the actual output parameter of the rectifying module is the actual charging parameter of the low-voltage battery.
It should be noted that the actual output parameters of the rectifying module are not limited too much, and may include, for example, an actual output current, an actual output voltage, and the like of the rectifying module. The actual charging parameters are not excessively limited, and may include, for example, an actual charging current, an actual charging voltage, and the like. For example, the actual output current of the rectifying module is the actual output current of the low-voltage battery, and the actual output voltage of the rectifying module is the actual output voltage of the low-voltage battery.
In one embodiment, adjusting the actual output parameter of the rectifier module based on the target charging parameter includes adjusting the actual output parameter of the rectifier module to the target charging parameter to adjust the actual charging parameter of the low voltage battery to the target charging parameter.
For example, taking the target charging parameter as the target charging current, the actual output parameter of the rectifying module as the actual output current, and the actual charging parameter as the actual charging current as an example, if the target charging current is 6A (amperes), the actual output current of the rectifying module and the actual charging current are 2A, the actual output current of the rectifying module can be adjusted to 6A, so as to adjust the actual charging current to 6A.
According to the charging method for the low-voltage battery, the charging circuit of the low-voltage battery comprises a first winding of a motor, a second winding of the motor, a first rectifying module and a whole vehicle controller, wherein the first winding and the second winding are mutually coupled, energy transmission can be conducted between the first winding and the second winding, the input end of the first rectifying module is connected with the first winding, the output end of the first rectifying module is connected with the low-voltage battery, the actual output torque of the first rectifying module is negative torque, the method comprises the steps of obtaining a charging signal output by the whole vehicle controller, the charging signal is used for indicating target charging parameters of the low-voltage battery, the actual output parameters of the first rectifying module are adjusted based on the target charging parameters, and the actual output parameters of the first rectifying module are the actual charging parameters of the low-voltage battery. Therefore, the mutual coupling between the motor windings can be utilized to realize energy transmission between the motor windings so as to realize the charging of the low-voltage battery, the integration level of a charging circuit of the low-voltage battery is improved, the charging cost of the low-voltage battery is reduced, the actual output parameters of the rectification module can be regulated based on the target charging parameters, the actual charging parameters of the low-voltage battery are regulated, and the charging reliability of the low-voltage battery is improved.
Fig. 5 is a flowchart illustrating a method of charging a low-voltage battery according to another exemplary embodiment, and as shown in fig. 5, the method of charging a low-voltage battery according to an embodiment of the present disclosure includes the following steps.
S501, acquiring a charging signal output by the vehicle controller, wherein the charging signal is used for indicating a target charging parameter of the low-voltage battery.
The relevant content of step S501 may be referred to the above embodiments, and will not be described herein.
S502, collecting actual output parameters of the rectifying module.
In one embodiment, if the actual output parameter of the rectifying module is the actual output current, the actual output current of the rectifying module may be collected by the current sensor.
In one embodiment, if the actual output parameter of the rectifying module is the actual output voltage, the actual output voltage of the rectifying module may be acquired by the voltage sensor.
S503, based on the target charging parameter and the actual output parameter of the rectifying module, the actual output parameter of the rectifying module is adjusted.
In one embodiment, adjusting the actual output parameter of the rectification module based on the target charging parameter and the actual output parameter of the rectification module may include obtaining a difference between the target charging parameter and the actual output parameter of the rectification module, and adjusting the actual output parameter of the rectification module based on the difference.
In some examples, adjusting the actual output parameter of the rectification module based on the difference value includes taking the difference value as an adjustment amount of the actual output parameter of the rectification module, and adjusting the actual output parameter of the rectification module according to the adjustment amount.
For example, taking the target charging parameter as the target charging current, the actual output parameter of the rectifying module as the actual output current, and the actual charging parameter as the actual charging current as an example, if the target charging current is 6A, the actual output current of the rectifying module and the actual charging current are 2A, the difference between the target charging current and the actual output current of the rectifying module is 4A, and the actual output current of the rectifying module can be improved by 4A.
In one embodiment, adjusting the actual output parameter of the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module may include obtaining a target direct current and a target quadrature current output by the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module, and adjusting the actual output parameter of the rectifying module based on the target direct current and the target quadrature current output by the rectifying module. Therefore, the target direct-axis current and the target quadrature-axis current output by the rectifying module can be obtained by comprehensively considering the target charging parameter and the actual output parameter of the rectifying module, so that the actual output parameter of the rectifying module is regulated.
For example, as shown in fig. 3, the control unit a may obtain the target direct axis output by the rectifying module based on the target charging parameter and the actual charging parameter of the low-voltage battery (i.e. the actual output parameter of the rectifying module)Electric currentAnd target quadrature axis current +.>。
In one embodiment, the target direct-axis current and the target quadrature-axis current output by the rectifying module are obtained based on the target charging parameter and the actual output parameter of the rectifying module, including the following possible embodiments:
mode 1, obtaining a target direct-axis current and a target quadrature-axis current output by a rectifying module based on a target charging current and an actual output current of the rectifying module, or obtaining a target direct-axis current and a target quadrature-axis current output by the rectifying module based on a target charging voltage and an actual output voltage of the rectifying module.
In some examples, the target direct current and the target quadrature current output by the rectifying module are obtained based on the target charging current and the actual output current of the rectifying module, including obtaining the target current output by the rectifying module based on the target charging current and the actual output current of the rectifying module, and decoupling the target current output by the rectifying module to obtain the target direct current and the target quadrature current output by the rectifying module.
In some examples, the target charging current and the actual output current of the rectifying module may be input to a set model, which outputs the target direct current and the target quadrature current output by the rectifying module. It should be noted that the setting model is not limited too much, and for example, a deep learning model may be included.
It should be noted that, based on the target charging voltage and the actual output voltage of the rectifying module, the target direct-axis current and the target quadrature-axis current output by the rectifying module are obtained, and the related content of the target direct-axis current and the target quadrature-axis current output by the rectifying module can be obtained by referring to the actual output current based on the target charging current and the rectifying module, which is not described herein.
And 2, acquiring a flux weakening parameter of the motor, and obtaining a target direct-axis current and a target quadrature-axis current which are output by the rectifying module based on the target charging parameter, the actual output parameter of the rectifying module and the flux weakening parameter.
Therefore, the target direct-axis current and the target quadrature-axis current output by the rectifying module can be obtained by comprehensively considering the target charging parameter, the actual output parameter of the rectifying module and the flux weakening parameter.
In some examples, the target charging current, the actual output current of the rectifying module, and the field weakening parameter may be input into a setting model, and the target direct-axis current and the target quadrature-axis current output by the rectifying module may be output by the setting model.
In one embodiment, the target direct current output by the rectifier module is zero, i.e., the rectifier module is engaged only in torque control and not in magnetic field control.
In one embodiment, the charging circuit of the low-voltage battery further comprises a first drive module, wherein an output end of the first drive module is connected with the drive end of the rectifying module.
The method comprises the steps of obtaining actual direct-axis current and actual quadrature-axis current output by a rectifying module based on actual output parameters of the rectifying module, obtaining driving signals output by a first driving module based on the actual direct-axis current and the actual quadrature-axis current output by the rectifying module and the target direct-axis current and the target quadrature-axis current output by the rectifying module, and controlling on or off of a switch in the rectifying module based on the driving signals output by the first driving module so as to regulate the actual output parameters of the rectifying module. Therefore, the actual direct-axis current and the actual quadrature-axis current output by the rectifying module, the target direct-axis current and the target quadrature-axis current output by the rectifying module can be comprehensively considered, and the driving signal output by the first driving module is obtained so as to adjust the actual output parameter of the rectifying module, and direct-axis and quadrature-axis double closed-loop control of the actual output parameter of the rectifying module can be realized.
In some examples, the driving signal output by the first driving module is obtained based on the actual direct current and the actual quadrature current output by the rectifying module, and the target direct current and the target quadrature current output by the rectifying module, including obtaining the driving signal output by the first driving module based on a difference value between the actual direct current and the actual quadrature current output by the rectifying module, and a difference value between the target direct current and the target quadrature current output by the rectifying module.
As another possible embodiment, as shown in fig. 3, the detecting unit a may detect the actual output parameters (such as three-phase current), the direct axis direction and the quadrature axis direction of the first winding 1, and obtain the actual direct axis current Id2 and the actual quadrature axis current Iq2 output by the rectifying module based on the actual output parameters, the direct axis direction and the quadrature axis direction of the first winding 1.
The control unit B can be based on the actual direct current Id2 and the actual quadrature current Iq2 output by the rectifying module and the target direct current output by the rectifying moduleAnd target quadrature axis current +.>And obtaining a driving signal of the rectifying module as a driving signal output by the first driving module.
According to the charging method for the low-voltage battery, the actual output parameters of the first rectifying module are collected, and the actual output parameters of the first rectifying module are adjusted based on the target charging parameters and the actual output parameters of the first rectifying module. Therefore, the target charging parameter and the actual output parameter of the first rectifying module can be comprehensively considered, the actual output parameter of the first rectifying module is adjusted, the actual charging parameter of the low-voltage battery is adjusted, and the charging reliability of the low-voltage battery is improved.
Fig. 6 is a flowchart illustrating a method of charging a low-voltage battery according to another exemplary embodiment, and as shown in fig. 6, the method of charging a low-voltage battery according to an embodiment of the present disclosure includes the following steps.
S601, acquiring a torque signal output by the whole vehicle controller, wherein the torque signal is used for indicating the target output torque of the motor.
The generation of the torque signal may be implemented by any method of generating a torque signal of a motor in the related art, which is not limited herein. For example, the target output torque of the motor may be determined based on a user's operation of the accelerator pedal, the brake pedal (such as displacement of the accelerator pedal, displacement of the brake pedal, etc.), to generate the torque signal.
S602, based on the target output torque of the motor, adjusting the actual output parameter of the inverter module to adjust the actual output torque of the inverter module.
It is understood that the actual output parameter of the inverter module affects the actual output torque of the inverter module, i.e., the actual output torque of the inverter module is determined based on the actual output parameter of the inverter module. The actual output parameters of the inverter module are not excessively limited, and may include, for example, an actual output current, an actual output voltage, and the like.
In one embodiment, the actual output parameters of the inverter module are adjusted based on the target output torque of the motor, including determining the target output parameters of the inverter module based on the target output torque of the motor, and adjusting the actual output parameters of the inverter module based on the target output parameters of the inverter module.
In some examples, determining the target output parameter of the inverter module based on the target output torque of the motor includes inputting the target output torque of the motor to a set model, and outputting the target output parameter of the inverter module by the set model.
In some examples, adjusting the actual output parameter of the inverter module based on the target output parameter of the inverter module includes adjusting the actual output parameter of the inverter module to the target output parameter of the inverter module.
In one embodiment, the actual output parameters of the inverter module are adjusted based on the target output torque of the motor, including obtaining the actual output torque of the rectifier module, obtaining the absolute value of the actual output torque of the rectifier module and the sum of the target output torques of the motor, and adjusting the actual output parameters of the inverter module based on the target output torque of the inverter module. Therefore, the absolute value of the actual output torque of the rectifying module and the sum of the target output torque of the motor can be obtained and used as the target output torque of the inversion module, so that the actual output parameters of the inversion module can be adjusted.
It should be noted that, in the embodiment of the disclosure, the output torque of the motor is a sum of the output torque of the rectifying module and the output torque of the inverter module, and the output torque of the rectifying module is a negative torque. For example, if the target output torque of the motor is 1000 The actual output torque of the rectifier module is-100 +.>The target output torque of the inverter module=1000+100=1100 +>。
It should be noted that, the actual output torque of the rectifying module may be obtained by any method for obtaining the motor torque in the related art, which is not limited herein. For example, the actual output torque of the rectifying module is obtained, and the actual output torque of the rectifying module is obtained based on the actual direct-axis current and the actual quadrature-axis current output by the rectifying module and the motor parameters.
It should be noted that, based on the target output torque of the inverter module, the adjustment of the actual output parameter of the inverter module may be implemented by using any adjustment method of the inverter module in the related art, for example, the related content of adjusting the actual output parameter of the rectifier module based on the target charging parameter in the above embodiment may be referred to, which is not described herein again,
in some examples, adjusting the actual output parameter of the inverter module based on the target output torque of the inverter module includes obtaining the actual output torque of the inverter module, and adjusting the actual output parameter of the inverter module based on the target output torque and the actual output torque of the inverter module.
For example, the actual output parameters of the inverter module are adjusted based on the target output torque and the actual output torque of the inverter module, including obtaining a target direct-axis current and a target quadrature-axis current output by the inverter module based on the target output torque and the actual output torque of the inverter module, and adjusting the actual output parameters of the inverter module based on the target direct-axis current and the target quadrature-axis current output by the inverter module.
As another possible implementation, as shown in fig. 3, the MTPA unit may obtain the target direct-axis current output by the inverter module based on the target output torque of the inverter moduleAnd target quadrature axis current +.>。
For example, the charging circuit of the low-voltage battery further comprises a second driving module, wherein the output end of the second driving module is connected with the driving end of the inversion module. The method comprises the steps of adjusting actual output parameters of an inversion module based on target straight-axis current and target quadrature-axis current output by the inversion module, obtaining actual straight-axis current and actual quadrature-axis current output by the inversion module based on the actual output parameters of the inversion module, obtaining a driving signal output by a second driving module based on the actual straight-axis current and the actual quadrature-axis current output by the inversion module and the target straight-axis current and the target quadrature-axis current output by the inversion module, and controlling on or off of a switch in the inversion module based on the driving signal output by the second driving module so as to adjust the actual output parameters of the inversion module.
For example, as shown in fig. 3, the detecting unit B may detect the actual output parameters, the direct axis direction and the quadrature axis direction of the inverter module, and obtain the actual direct output of the inverter module based on the actual output parameters (such as three-phase current), the direct axis direction and the quadrature axis direction of the inverter moduleAn axis current Id1 and an actual quadrature axis current Iq1. The control unit C can be based on the actual direct current Id1 and the actual quadrature current Iq1 output by the inverter module, and the target direct current output by the inverter moduleAnd target quadrature axis current +.>And obtaining a driving signal of the inversion module as a driving signal output by the second ear driving module.
According to the charging method for the low-voltage battery, the charging circuit for the low-voltage battery further comprises an inversion module and a high-voltage battery, wherein the input end of the inversion module is connected with the high-voltage battery, the output end of the inversion module is connected with the second winding, the method further comprises the step of obtaining a torque signal output by the whole vehicle controller, the torque signal is used for indicating target output torque of a motor, and the actual output parameters of the inversion module are adjusted based on the target output torque of the motor so as to adjust the actual output torque of the inversion module. Therefore, the mutual coupling between the motor windings can be utilized to realize energy transmission between the motor windings so as to charge the high-voltage battery, and the actual output parameters of the inverter module can be adjusted based on the target output torque of the motor so as to adjust the actual output torque of the inverter module.
Fig. 7 is a block diagram illustrating a charging device of a low-voltage battery according to an exemplary embodiment. The charging circuit of the low-voltage battery comprises a first winding of the motor, a second winding of the motor, a rectifying module and a whole vehicle controller, wherein the first winding is mutually coupled with the second winding, energy transmission can be carried out between the first winding and the second winding, the input end of the rectifying module is connected with the first winding, the output end of the rectifying module is connected with the low-voltage battery, and the actual output torque of the rectifying module is negative torque.
Referring to fig. 7, a charging device 200 of a low voltage battery according to an embodiment of the present disclosure includes: an acquisition module 210 and an adjustment module 220.
An acquisition module 210 configured to perform acquisition of a charging signal output by the vehicle controller, where the charging signal is used to indicate a target charging parameter of the low-voltage battery;
the adjusting module 220 is configured to perform adjustment of an actual output parameter of the rectifying module based on the target charging parameter, wherein the actual output parameter of the rectifying module is an actual charging parameter of the low-voltage battery.
In one embodiment of the present disclosure, the adjustment module 220 is further configured to perform: collecting actual output parameters of the rectifying module; and adjusting the actual output parameter of the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module.
In one embodiment of the present disclosure, the adjustment module 220 is further configured to perform: obtaining a target direct-axis current and a target quadrature-axis current output by the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module; and adjusting the actual output parameters of the rectifying module based on the target direct-axis current and the target quadrature-axis current output by the rectifying module.
In one embodiment of the present disclosure, the target direct current output by the rectifying module is zero.
In one embodiment of the disclosure, the charging circuit of the low-voltage battery further comprises a first driving module, wherein an output end of the first driving module is connected with a driving end of the rectifying module;
the adjustment module 220 is further configured to perform: based on the actual output parameters of the rectifying module, obtaining the actual direct-axis current and the actual quadrature-axis current output by the rectifying module; obtaining a driving signal output by the first driving module based on the actual direct-axis current and the actual quadrature-axis current output by the rectifying module and the target direct-axis current and the target quadrature-axis current output by the rectifying module; and controlling the on-off of a switch in the rectifying module based on a driving signal output by the first driving module so as to adjust the actual output parameter of the rectifying module.
In one embodiment of the disclosure, the charging circuit of the low-voltage battery further comprises an inverter module and a high-voltage battery, wherein an input end of the inverter module is connected with the high-voltage battery, and an output end of the inverter module is connected with the second winding;
the adjustment module 220 is further configured to perform: acquiring a torque signal output by the whole vehicle controller, wherein the torque signal is used for indicating the target output torque of the motor; and adjusting the actual output parameters of the inverter module based on the target output torque of the motor so as to adjust the actual output torque of the inverter module.
In one embodiment of the present disclosure, the adjustment module 220 is further configured to perform: acquiring the actual output torque of the rectifying module; acquiring the absolute value of the actual output torque of the rectifying module and the sum of the target output torque of the motor as the target output torque of the inversion module; and adjusting the actual output parameters of the inversion module based on the target output torque of the inversion module.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
The charging device for the low-voltage battery, provided by the embodiment of the disclosure, comprises a first winding of a motor, a second winding of the motor, a first rectifying module and a whole vehicle controller, wherein the first winding and the second winding are mutually coupled, energy transmission can be performed between the first winding and the second winding, the input end of the first rectifying module is connected with the first winding, the output end of the first rectifying module is connected with the low-voltage battery, the actual output torque of the first rectifying module is negative torque, the method comprises the steps of obtaining a charging signal output by the whole vehicle controller, the charging signal is used for indicating target charging parameters of the low-voltage battery, and the actual output parameters of the first rectifying module are adjusted based on the target charging parameters, wherein the actual output parameters of the first rectifying module are the actual charging parameters of the low-voltage battery. Therefore, the mutual coupling between the motor windings can be utilized to realize energy transmission between the motor windings so as to realize the charging of the low-voltage battery, the integration level of a charging circuit of the low-voltage battery is improved, the charging cost of the low-voltage battery is reduced, the actual output parameters of the rectification module can be regulated based on the target charging parameters, the actual charging parameters of the low-voltage battery are regulated, and the charging reliability of the low-voltage battery is improved.
Fig. 8 is a block diagram of a vehicle, according to an exemplary embodiment. For example, the vehicle 300 may be a hybrid vehicle, or may be a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other type of vehicle. The vehicle 300 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.
Referring to fig. 8, a vehicle 300 may include various subsystems, such as an infotainment system 310, a perception system 320, a decision control system 320, a drive system 340, and a computing platform 350. Wherein the vehicle 300 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, interconnections between each subsystem and between each component of the vehicle 300 may be achieved by wired or wireless means.
In some embodiments, the infotainment system 310 may include a communication system, an entertainment system, a navigation system, and the like.
The perception system 320 may include several types of sensors for sensing information of the environment surrounding the vehicle 300. For example, the perception system 320 may include a global positioning system (which may be a GPS system, or may be a beidou system or other positioning system), an inertial measurement unit (inertial measurement unit, IMU), a lidar, millimeter wave radar, an ultrasonic radar, and a camera device.
Decision control system 330 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.
The drive system 340 may include components that provide powered movement of the vehicle 300. In one embodiment, the drive system 340 may include an engine, an energy source, a transmission, and wheels. The engine may be one or a combination of an internal combustion engine, an electric motor, an air compression engine. The engine is capable of converting energy provided by the energy source into mechanical energy.
Some or all of the functions of the vehicle 300 are controlled by the computing platform 350. The computing platform 350 may include at least one processor 351 and a memory 352, the processor 351 may execute instructions 353 stored in the memory 352.
The processor 351 may be any conventional processor, such as a commercially available CPU. The processor may also include, for example, an image processor (Graphic Process Unit, GPU), a field programmable gate array (Field Programmable Gate Array, FPGA), a System On Chip (SOC), an application specific integrated Chip (Application Specific Integrated Circuit, ASIC), or a combination thereof.
The memory 352 may be implemented by any type or combination of volatile or nonvolatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.
In addition to instructions 353, memory 352 may store data such as road maps, route information, vehicle location, direction, speed, and the like. The data stored by memory 352 may be used by computing platform 350.
In an embodiment of the present disclosure, the processor 351 may execute the instructions 353 to implement all or part of the steps of the method for charging a low voltage battery provided by the present disclosure.
According to the vehicle disclosed by the embodiment of the disclosure, the mutual coupling between the motor windings can be utilized to realize energy transmission between the motor windings so as to realize charging of the low-voltage battery, the integration level of the charging circuit of the low-voltage battery is improved, the charging cost of the low-voltage battery is reduced, the actual output parameters of the rectifying module can be regulated based on the target charging parameters, the actual charging parameters of the low-voltage battery are regulated, and the charging reliability of the low-voltage battery is improved.
In order to implement the above-described embodiments, the present disclosure also proposes a computer-readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the steps of the method for charging a low-voltage battery provided by the present disclosure.
Alternatively, the computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This disclosure is intended to cover any adaptations, uses, or adaptations of the disclosure following the general principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (8)

1. A method of charging a low voltage battery, the method comprising:
the device comprises a first winding of a motor, a second winding of the motor, a rectifying module, a first driving module, an inversion module, a high-voltage battery, a second driving module and a whole vehicle controller; wherein,
the first winding is mutually coupled with the second winding, energy transmission is carried out between the first winding and the second winding, the input end of the rectifying module is connected with the first winding, the output end of the rectifying module is connected with the low-voltage battery, and the actual output torque of the rectifying module is negative torque;
The output end of the first driving module is connected with the driving end of the rectifying module, and the input end of the first driving module is connected with the output end of the whole vehicle controller;
the output end of the inversion module is connected with the second winding, the input end of the inversion module is connected with the high-voltage battery, the driving end of the inversion module is connected with the output end of the second driving module, and the input end of the second driving module is connected with the output end of the whole vehicle controller;
the charging method comprises the following steps:
acquiring a charging signal output by the whole vehicle controller, wherein the charging signal is used for indicating a target charging parameter of the low-voltage battery;
based on the target charging parameter, adjusting an actual output parameter of the rectifying module, wherein the actual output parameter of the rectifying module is an actual charging parameter of the low-voltage battery;
the charging method further includes:
acquiring a torque signal output by the whole vehicle controller and an actual output torque of the rectifying module, wherein the torque signal is used for indicating a target output torque of the motor;
acquiring the absolute value of the actual output torque of the rectifying module and the sum of the target output torque of the motor as the target output torque of the inversion module;
And adjusting the actual output parameters of the inverter module based on the target output torque of the inverter module so as to adjust the actual output torque of the inverter module.
2. The method of claim 1, wherein the adjusting the actual output parameter of the rectifier module based on the target charging parameter comprises:
collecting actual output parameters of the rectifying module;
and adjusting the actual output parameter of the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module.
3. The method of claim 2, wherein the adjusting the actual output parameter of the rectifier module based on the target charging parameter and the actual output parameter of the rectifier module comprises:
obtaining a target direct-axis current and a target quadrature-axis current output by the rectifying module based on the target charging parameter and the actual output parameter of the rectifying module;
and adjusting the actual output parameters of the rectifying module based on the target direct-axis current and the target quadrature-axis current output by the rectifying module.
4. A method according to claim 3, wherein the target direct current output by the rectifying module is zero.
5. A method according to claim 3, wherein said adjusting the actual output parameters of the rectifying module based on the target direct current and the target quadrature current output by the rectifying module comprises:
based on the actual output parameters of the rectifying module, obtaining the actual direct-axis current and the actual quadrature-axis current output by the rectifying module;
obtaining a driving signal output by the first driving module based on the actual direct-axis current and the actual quadrature-axis current output by the rectifying module and the target direct-axis current and the target quadrature-axis current output by the rectifying module;
and controlling the on-off of a switch in the rectifying module based on a driving signal output by the first driving module so as to adjust the actual output parameter of the rectifying module.
6. A charging device for a low-voltage battery, characterized by being applied to a charging circuit for a low-voltage battery, the charging circuit comprising:
the device comprises a first winding of a motor, a second winding of the motor, a rectifying module, a first driving module, an inversion module, a high-voltage battery, a second driving module and a whole vehicle controller; wherein,
the first winding is mutually coupled with the second winding, energy transmission is carried out between the first winding and the second winding, the input end of the rectifying module is connected with the first winding, the output end of the rectifying module is connected with the low-voltage battery, and the actual output torque of the rectifying module is negative torque;
The output end of the first driving module is connected with the driving end of the rectifying module, and the input end of the first driving module is connected with the output end of the whole vehicle controller;
the output end of the inversion module is connected with the second winding, the input end of the inversion module is connected with the high-voltage battery, the driving end of the inversion module is connected with the output end of the second driving module, and the input end of the second driving module is connected with the output end of the whole vehicle controller;
the charging device includes:
the acquisition module is configured to acquire a charging signal output by the whole vehicle controller, wherein the charging signal is used for indicating a target charging parameter of the low-voltage battery;
an adjustment module configured to perform adjustment of an actual output parameter of the rectification module based on the target charging parameter, wherein the actual output parameter of the rectification module is an actual charging parameter of the low-voltage battery;
the charging device further includes:
acquiring a torque signal output by the whole vehicle controller and an actual output torque of the rectifying module, wherein the torque signal is used for indicating a target output torque of the motor;
Acquiring the absolute value of the actual output torque of the rectifying module and the sum of the target output torque of the motor as the target output torque of the inversion module;
and adjusting the actual output parameters of the inverter module based on the target output torque of the inverter module so as to adjust the actual output torque of the inverter module.
7. A vehicle, characterized by comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
a method for carrying out the method of any one of claims 1-5.
8. A computer readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the steps of the method of any of claims 1-5.
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