CN112531826A - Vehicle-mounted low-voltage storage battery charging method and device and vehicle - Google Patents

Vehicle-mounted low-voltage storage battery charging method and device and vehicle Download PDF

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Publication number
CN112531826A
CN112531826A CN202011344786.0A CN202011344786A CN112531826A CN 112531826 A CN112531826 A CN 112531826A CN 202011344786 A CN202011344786 A CN 202011344786A CN 112531826 A CN112531826 A CN 112531826A
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China
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voltage
low
storage battery
vehicle
charging
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CN202011344786.0A
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Chinese (zh)
Inventor
胡海波
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Beijing CHJ Automotive Information Technology Co Ltd
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Beijing CHJ Automotive Information Technology Co Ltd
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Priority to CN202011344786.0A priority Critical patent/CN112531826A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/007—Regulation of charging or discharging current or voltage
    • H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
    • H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
    • 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

Abstract

The embodiment of the disclosure discloses a vehicle-mounted low-voltage storage battery charging method and device and a vehicle, and relates to the technical field of vehicle-mounted battery charging. The main technical scheme of the embodiment of the disclosure comprises the following steps: the storage battery detection unit detects whether a difference value between a design current of a low-voltage storage battery and a current charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery is within a preset range; if the storage battery detection unit detects that the difference value is not within the preset range, the storage battery detection unit sends a voltage adjustment request to the vehicle-mounted voltage transformation unit; and the vehicle-mounted voltage transformation unit adjusts the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit, and provides the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery.

Description

Vehicle-mounted low-voltage storage battery charging method and device and vehicle
Technical Field
The embodiment of the disclosure relates to the technical field of vehicle-mounted battery charging control, in particular to a vehicle-mounted low-voltage storage battery charging method and device and a vehicle.
Background
With the progress of society, vehicles such as electric vehicles and extended range vehicles gradually become the main vehicles for people to go out, so that the lives of people are more and more convenient. In order to enable a user to use some electrical equipment such as a car phone, a portable DVD, a mobile phone charger, etc. in a vehicle, a low-voltage battery is generally provided in the vehicle to supply power to the external electrical equipment by using the low-voltage battery.
In order to ensure that the low-voltage storage battery can have sufficient electric quantity to supply power to the electrical equipment to be used, the low-voltage storage battery needs to be charged in time. At present, a vehicle-mounted voltage transformation unit (DCDC) in a vehicle is generally used for charging a low-voltage storage battery, but the vehicle-mounted voltage transformation unit is a device for performing conversion between high-voltage and low-voltage Direct currents in the vehicle, and when the vehicle runs, the vehicle-mounted voltage transformation unit is also responsible for supplying power to other electric components in the vehicle besides charging the low-voltage storage battery. When the vehicle-mounted voltage transformation unit is used for charging the low-voltage storage battery, once the power requirements of other electric components in the vehicle find changes, the charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery can be greatly changed, and even impact is generated on the low-voltage storage battery, so that the chemical structure of the low-voltage storage battery is changed, and the service life of the low-voltage storage battery is influenced.
Disclosure of Invention
In view of this, embodiments of the present disclosure provide a method and an apparatus for charging a vehicle-mounted low-voltage battery, and a vehicle, and mainly aim to reduce impact of a charging current provided by a vehicle-mounted voltage transformation unit on the vehicle-mounted low-voltage battery, so as to prolong the service life of the vehicle-mounted low-voltage battery. The main technical scheme comprises:
in a first aspect, an embodiment of the present disclosure provides an on-vehicle low-voltage battery charging method, including:
the storage battery detection unit detects whether a difference value between a design current of a low-voltage storage battery and a current charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery is within a preset range;
if the storage battery detection unit detects that the difference value is not within the preset range, the storage battery detection unit sends a voltage adjustment request to the vehicle-mounted voltage transformation unit;
and the vehicle-mounted voltage transformation unit adjusts the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit, and provides the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery.
In a second aspect, embodiments of the present disclosure provide an onboard low-voltage battery charging apparatus, the apparatus including:
the storage battery detection unit is used for detecting whether a difference value between the design current of the low-voltage storage battery and the current charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery is within a preset range or not; if the difference value is detected not to be within the preset range, sending a voltage adjustment request to the vehicle-mounted voltage transformation unit;
and the vehicle-mounted voltage transformation unit is used for adjusting the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit and providing the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery.
In a third aspect, embodiments of the present disclosure provide a vehicle comprising: the vehicle-mounted low-voltage storage battery charging device comprises a low-voltage storage battery, a power interface and the vehicle-mounted low-voltage storage battery charging device of the second aspect, wherein the low-voltage storage battery is connected with the power interface;
the low-voltage storage battery is used for charging under the action of the vehicle-mounted low-voltage storage battery charging device; providing a voltage to the power interface when the power interface requests a voltage;
and the power interface is used for transmitting the voltage provided by the low-voltage storage battery to standby electric equipment connected with the low-voltage storage battery.
According to the charging method and device for the vehicle-mounted low-voltage storage battery and the vehicle, the charging of the low-voltage storage battery by the vehicle-mounted voltage transformation unit is completed through interaction between the storage battery detection unit and the vehicle-mounted voltage transformation unit. In the interaction process, the storage battery detection unit detects whether the difference value between the design current of the low-voltage storage battery and the current charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery is within a preset range. And if the storage battery detection unit detects that the difference value is within the preset range, the current charging current is used for charging the low-voltage storage battery. If the battery detection unit detects that the difference value is not within the preset range, the battery detection unit sends a voltage adjustment request to the vehicle-mounted voltage transformation unit. The vehicle-mounted voltage transformation unit adjusts the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit, and provides the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery. Therefore, when the vehicle-mounted voltage transformation unit charges the low-voltage storage battery, the vehicle-mounted voltage transformation unit is controlled to charge the low-voltage storage battery by using the charging current corresponding to the design current of the low-voltage storage battery, so that the charging of the low-voltage storage battery by using the stable charging current is realized, the impact of the charging current on the low-voltage storage battery is avoided, and the service life of the low-voltage storage battery is prolonged.
The foregoing description is only an overview of the embodiments of the present disclosure, and in order to make the technical means of the embodiments of the present disclosure more clearly understood, the embodiments of the present disclosure may be implemented in accordance with the content of the description, and in order to make the foregoing and other objects, features, and advantages of the embodiments of the present disclosure more clearly understood, the following detailed description of the embodiments of the present disclosure is given.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the embodiments of the present disclosure. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a flowchart of an on-board low-voltage battery charging method provided by an embodiment of the present disclosure;
FIG. 2 illustrates a flow chart of another on-board low-voltage battery charging method provided by an embodiment of the present disclosure;
fig. 3 shows a block diagram of a low-voltage battery charging apparatus provided in an embodiment of the present disclosure;
FIG. 4 is a block diagram illustrating the components of another low-voltage battery charging apparatus provided by an embodiment of the present disclosure;
fig. 5 shows a block diagram of a vehicle according to an embodiment of the present disclosure.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
At present, a vehicle in practical application is generally provided with a low-voltage storage battery so as to provide voltage for some electrical equipment such as a vehicle-mounted telephone, a portable DVD, a mobile phone charger and the like externally connected to the vehicle by using the low-voltage storage battery, thereby meeting the use requirements of some electrical equipment of a user in the vehicle. The voltage of the low-voltage storage battery and the battery type are determined based on the service requirement, and the embodiment is not limited. Illustratively, the low voltage battery is a 12 volt lithium battery.
In order to ensure that the low-voltage storage battery can have sufficient electric quantity to supply power to the electrical equipment to be used, the low-voltage storage battery needs to be charged in time. At present, a vehicle-mounted voltage transformation unit (DCDC) in a vehicle is generally used for charging a low-voltage battery, but the DCDC is a device for performing conversion between high-voltage and low-voltage Direct currents in the vehicle, and is also used for charging the low-voltage battery and supplying power to other electric components in the vehicle during the running of the vehicle. When the DCDC outputs power outwards, the output current of the DCDC is shunted, part of the output current is supplied to other electric components in the vehicle as the supply current of other electric components, and part of the output current is supplied to the low-voltage storage battery for charging as the charging current of the low-voltage storage battery. When the DCDC is used for charging the low-voltage storage battery, if other electric components in the vehicle stop working or the demand of the supply current is reduced, the charging current of the low-voltage storage battery becomes large, and the impact on the low-voltage storage battery may be generated, and if the demand of the supply current of other electric components in the vehicle is increased, the charging current of the low-voltage storage battery becomes small, and the charging efficiency of the low-voltage storage battery is reduced. It can be seen that when the DCDC is used for charging the low-voltage storage battery, once the power requirements of other electric components in the vehicle are changed, the charging current provided by the DCDC for the low-voltage storage battery is changed greatly, and even impact is generated on the low-voltage storage battery, so that the chemical structure of the low-voltage storage battery is changed, and the service life of the low-voltage storage battery is influenced. The embodiment of the disclosure is provided for prolonging the service life of the low-voltage storage battery, and can reduce the impact of the charging current on the vehicle-mounted low-voltage storage battery when the DCDC charges the vehicle-mounted low-voltage storage battery, so as to prolong the service life of the vehicle-mounted low-voltage storage battery. The charging method of the vehicle-mounted low-voltage storage battery provided by the embodiment of the disclosure is an interaction method applied between the storage battery detection unit LBMS and the DCDC, and the DCDC is controlled to charge the low-voltage storage battery in a constant current output mode through interaction between the LBMS and the DCDC.
In a first aspect, an embodiment of the present disclosure provides a vehicle-mounted low-voltage battery charging method, as shown in fig. 1, the method mainly includes:
101. the storage battery detection unit detects whether a difference value between a design current of the low-voltage storage battery and a current charging current provided to the low-voltage storage battery by the vehicle-mounted voltage transformation unit is within a preset range, and executes step 102 or step 103.
In practical applications, the magnitude of the current that impacts the low-voltage battery is not a constant value, and varies with the held charge of the low-voltage battery, that is, the magnitude of the current that impacts the low-voltage battery varies with the held charge of the low-voltage battery. Therefore, in order to protect the low-voltage storage battery from the impact of the charging current to the maximum extent, different held power intervals are set, and the held power in the different held power intervals corresponds to different design currents, namely, the maximum charging current which can be received when the low-voltage storage battery holds the held power corresponding to the design current.
In order to protect the low-voltage battery, the low-voltage battery is equipped with a corresponding battery test unit LBMS, which is used to manage the charging of the low-voltage battery. When DCDC charges for low-voltage battery, DCDC must provide charging current to low-voltage battery, and in order to avoid the charging current that DCDC provided to produce the impact to low-voltage battery, then LBMS need detect whether charging current produces the impact to low-voltage battery, and this detection process specifically is: the LBMS detects whether a difference between a design current of the low-voltage secondary battery and a current charging current supplied to the low-voltage secondary battery by the DCDC is within a preset range.
The preset range is determined based on the service requirement, and specifically includes the following two forms: one is a value which is 0, that is, when the difference between the current charging current and the design current is 0, the low-voltage battery can be charged by the current charging current; the second is a value range, which is composed of two values with different magnitudes, for example, the preset range is [0, 1.5], that is, the difference between the current charging current and the design current is within the preset range, so that the low-voltage battery can be charged by the current charging current.
The present charging current of the low-voltage battery described here includes the following two cases: firstly, the current charging current is the total current currently output by the on-board voltage transformation unit, that is, other power consuming components in the vehicle currently use the power supply of the on-board voltage transformation unit. The current charging current is a difference value between the total current currently output by the vehicle-mounted voltage transformation unit and the current used by other electric components in the vehicle, that is, the current charging current is a partial current in the total current currently output by the vehicle-mounted voltage transformation unit.
If the LBMS detects that the difference between the design current of the low-voltage battery and the current charging current provided by the DCDC to the low-voltage battery is within the preset range, it indicates that the current charging current does not impact the low-voltage battery, the probability of changing the chemical structure of the low-voltage battery is low, and at this time, the current charging current can be directly used to charge the low-voltage battery, and then step 102 is executed.
If the LBMS detects that the difference between the current charging current provided by the DCDC to the low-voltage battery and the design current of the low-voltage battery is not within the preset range, which indicates that the current charging current is larger than the design current corresponding to the currently held electric quantity, and may possibly cause a shock to the low-voltage battery, at this time, in order to not cause a shock to the low-voltage battery, the DCDC is requested to adjust the charging voltage output to the low-voltage battery so that the difference between the current charging current provided by the DCDC to the low-voltage battery and the design current of the low-voltage battery is within the preset range, so step 103 is performed.
102. And if the storage battery detection unit detects that the difference value is within the preset range, the current charging current is used for charging the low-voltage storage battery.
If the LBMS detects that the difference value between the current charging current provided by the DCDC to the low-voltage storage battery and the design current of the low-voltage storage battery is within the preset range, the current charging current does not impact the low-voltage storage battery, the probability of changing the chemical structure of the low-voltage storage battery is low, and the current charging current can be directly used for charging the low-voltage storage battery.
103. And if the storage battery detection unit detects that the difference value is not within the preset range, the storage battery detection unit sends a voltage adjustment request to the vehicle-mounted voltage transformation unit.
If the LBMS detects that the difference between the current charging current provided by the DCDC to the low-voltage battery and the design current of the low-voltage battery is not within the preset range, it indicates that the current charging current is larger than the design current corresponding to the current held power, and may possibly cause a shock to the low-voltage battery.
In the following, a voltage adjustment request is described, and the form of the voltage adjustment request includes at least the following two types:
first, the LBMS sends a voltage adjustment request to the DCDC, which is used to inform the DCDC that it needs to adjust the charging voltage it outputs to the low-voltage battery, but does not limit the specific voltage value of the charging voltage that the DCDC outputs.
Secondly, the LBMS determines a desired voltage value according to the design current of the low-voltage storage battery; a voltage adjustment request carrying a desired voltage value is sent to the DCDC. The method for determining the expected voltage value at least comprises the following steps: firstly, the current charging current is the total current currently output by the vehicle-mounted voltage transformation unit, and is determined according to the expected voltage value and the resistance of the DCDC, namely, the expected voltage value is the product of the design current and the resistance of the DCDC; secondly, if the current charging current is the difference value between the total current currently output by the vehicle-mounted voltage transformation unit and the current used by other electric components in the vehicle, and the design current is larger than the current charging current, the difference value between the design current and the current charging current is determined, the product of the difference value and the resistance of the DCDC is determined, and then the sum of the product and the voltage value of the voltage currently output by the vehicle-mounted voltage transformation unit is determined as an expected voltage value; and thirdly, if the current charging current is the difference value between the total current currently output by the vehicle-mounted voltage transformation unit and the current used by other electric components in the vehicle, and the design current is smaller than the current charging current, determining the difference value between the current charging current and the design current, determining the product of the difference value and the resistance of the DCDC, and then determining the difference value between the voltage value currently output by the vehicle-mounted voltage transformation unit and the product as an expected voltage value. In this way, the charging voltage output from the DCDC to the low-voltage battery can be quickly adjusted to a voltage that meets the charging requirement of the low-voltage battery.
No matter which of the two forms the voltage adjustment request is, the LBMS may send the voltage adjustment request to the DCDC through the following steps: the LBMS sends a voltage adjustment request to the VCU through the CAN bus, wherein the VCU represents the whole vehicle controller; the VCU forwards the voltage adjustment request sent by the LBMS to the DCDC.
104. And the vehicle-mounted voltage transformation unit adjusts the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit, and provides the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery.
The process of the DCDC adjusting the charging voltage output by the DCDC to the low-voltage storage battery is related to the form of the voltage adjustment request, and at least comprises the following steps:
first, when the voltage adjustment request is only used to inform the DCDC that it needs to adjust the charging voltage output by the DCDC to the low-voltage battery, but does not define the specific voltage value of the charging voltage output by the DCDC, the voltage adjustment request carries information that the design current is greater than the current charging current, and the specific process of the DCDC adjusting the charging voltage output by the DCDC to the low-voltage battery at the voltage adjustment request of LBMS is as follows: under the voltage regulation request of the LBMS, the sum of the voltage value of the charging voltage currently output to the low-voltage storage battery by the DCDC and a first preset step value is determined as a first target voltage value; the DCDC adjusts a charging voltage whose output voltage value is a first target voltage value to the low-voltage battery.
Specifically, if the LBMS detects that the difference is within the preset range and the current charging current provided by the DCDC to the low-voltage battery is smaller than the design current of the low-voltage battery, although the current charging current does not impact the low-voltage battery, the charging efficiency is not high, and the charging voltage output from the DCDC to the low-voltage battery needs to be increased to increase the charging current, thereby increasing the charging efficiency. At this time, the DCDC determines the sum of the voltage value of the charging voltage currently output to the low-voltage storage battery and the first preset step value as a first target voltage value, and then the DCDC adjusts the charging voltage with the voltage value output to the low-voltage storage battery as the first target voltage value, so that the purpose of increasing the charging current is achieved.
Secondly, when the voltage adjustment request is only used to inform the DCDC that it needs to adjust the charging voltage output by the DCDC to the low-voltage battery, but does not define the specific voltage value of the charging voltage output by the DCDC, the voltage adjustment request carries information that the design current is smaller than the current charging current, and the specific process of the DCDC adjusting the charging voltage output by the DCDC to the low-voltage battery at the voltage adjustment request of the LBMS is as follows: under the voltage regulation request of the LBMS, the DCDC determines the difference between the voltage value of the charging voltage currently output to the low-voltage storage battery and a second preset step value as a second target voltage value; the DCDC adjusts the charging voltage whose output voltage value is the second target voltage value to the low-voltage secondary battery.
Specifically, if the LBMS detects that the difference is within the preset range and the current charging current provided by the DCDC to the low-voltage battery is greater than the design current of the low-voltage battery, the current charging current may impact the low-voltage battery. At this time, in order to avoid the low-voltage battery from being impacted by the current, the DCDC determines the difference between the voltage value of the charging voltage currently output to the low-voltage battery and the second preset step value as a second target voltage value, and then the DCDC adjusts the charging voltage whose voltage value is output to the low-voltage battery as the second target voltage value, thereby achieving the purpose of reducing the charging current.
Thirdly, the LBMS determines an expected voltage value according to the design current of the low-voltage battery, and when the voltage adjustment request carries the expected voltage value, the DCDC adjusts the charging voltage output to the low-voltage battery according to the voltage adjustment request of the LBMS by the specific process of: the DCDC adjusts the charging voltage that it outputs to the low-voltage battery with a voltage value that is a desired voltage value. The adjustment mode is accurate, and the charging voltage output by the DCDC can be directly adjusted to the condition required by the low-voltage storage battery.
Specifically, the process of the DCDC adjusting the charging voltage whose voltage value is the desired voltage value to the low-voltage battery is related to the magnitude of the desired voltage value, and therefore, before the DCDC adjusting the charging voltage whose voltage value is the desired voltage value to the low-voltage battery, the following steps are required: the DCDC determines whether a difference between a voltage value of a charging voltage it currently outputs to the low-voltage battery and an expected voltage value is not greater than a preset difference, which is used to define a voltage adjustment manner of the on-vehicle voltage transforming unit.
Specifically, if the DCDC determines that the difference between the voltage value of the charging voltage currently output to the low-voltage battery and the expected voltage value is not greater than the preset difference, which indicates that the voltage regulation amplitude is not large, the DCDC adjusts the charging voltage whose voltage value is the expected voltage value to be output to the low-voltage battery.
Specifically, if the DCDC determines that the difference between the voltage value of the charging voltage currently output to the low-voltage battery and the expected voltage value is greater than the preset difference, it indicates that the voltage regulation amplitude is large, and if the charging voltage of the expected voltage value is directly regulated, the DCDC may be damaged to some extent, so that smooth voltage regulation is required. The voltage regulating process of the DCDC comprises the following steps: the DCDC determines the voltage adjustment times and the voltage value of each adjustment, and adjusts the output voltage of the DCDC for multiple times according to the voltage adjustment times and the voltage value of each adjustment until the voltage value of the charging voltage output by the DCDC is the expected voltage value. It should be noted that the number of voltage adjustments is at least two. When the voltage adjustment times are two times, the voltage values of voltage adjustment in each time are the same. When the voltage adjustment times are more than two times, except for the last voltage adjustment, the voltage values of the voltage adjustment in each time are the same, and the voltage value of the last voltage adjustment is the remaining voltage value to be adjusted.
Fourth, since the determined expected voltage value is a theoretical value, which may have a certain error, the third method may be used in combination with the first and second methods to adjust the charging voltage of the on-board voltage transforming unit in time when the expected voltage value has an error.
The LBMS determines a desired voltage value according to the design current of the low-voltage storage battery, and when the voltage adjustment request carries the desired voltage value, the DCDC adjusts the charging voltage which outputs the voltage value to the low-voltage storage battery to be the desired voltage value.
After the DCDC adjusts the charging voltage output by the DCDC to the low-voltage storage battery, if the LBMS detects that the difference value between the design current and the current charging current is not in the preset range and determines that the design current is larger than the current charging current provided by the DCDC, sending a voltage adjustment request carrying information that the design current is larger than the current charging current to the DCDC, and determining the sum of the voltage value of the charging voltage output by the DCDC to the low-voltage storage battery and a first preset step value as a first target voltage value under the voltage adjustment request of the LBMS; the DCDC adjusts a charging voltage whose output voltage value is a first target voltage value to the low-voltage battery.
After the DCDC adjusts the charging voltage output by the DCDC to the low-voltage storage battery, if the LBMS detects that the difference value between the design current and the current charging current is not in the preset range and determines that the design current is smaller than the current charging current, sending a voltage adjustment request carrying information that the design current is smaller than the current charging current to the DCDC, and determining the difference between the voltage value of the charging voltage output by the DCDC to the low-voltage storage battery currently and a second preset step length value as a second target voltage value by the DCDC under the voltage adjustment request of the LBMS; the DCDC adjusts the charging voltage whose output voltage value is the second target voltage value to the low-voltage secondary battery.
In practical application, the user can freely select the four voltage regulation modes based on the own requirements, which is not limited in this embodiment. However, it should be noted that the DCDC adjusts the charging voltage output to the low-voltage battery, and provides the charging current corresponding to the charging voltage as the current charging current to the low-voltage battery for charging the low-voltage battery, and the step 101 is continuously executed to protect the battery.
It should be noted that, after the DCDC adjusts the charging voltage output by the low-voltage battery, the current charging current provided by the DCDC to the low-voltage battery includes at least the following two forms: firstly, the current charging current is the total current currently output by the on-board voltage transformation unit, that is, other power consuming components in the vehicle currently use the power supply of the on-board voltage transformation unit. The current charging current is a difference value between the total current currently output by the vehicle-mounted voltage transformation unit and the current used by other electric components in the vehicle, that is, the current charging current is a partial current in the total current currently output by the vehicle-mounted voltage transformation unit.
According to the charging method of the vehicle-mounted low-voltage storage battery provided by the embodiment of the disclosure, the charging of the vehicle-mounted voltage transformation unit to the low-voltage storage battery is completed through the interaction between the storage battery detection unit and the vehicle-mounted voltage transformation unit. In the interaction process, the storage battery detection unit detects whether the difference value between the design current of the low-voltage storage battery and the current charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery is within a preset range. And if the storage battery detection unit detects that the difference value is within the preset range, the current charging current is used for charging the low-voltage storage battery. If the battery detection unit detects that the difference value is not within the preset range, the battery detection unit sends a voltage adjustment request to the vehicle-mounted voltage transformation unit. The vehicle-mounted voltage transformation unit adjusts the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit, and provides the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery. Therefore, when the vehicle-mounted voltage transformation unit charges the low-voltage storage battery, the vehicle-mounted voltage transformation unit is controlled to charge the low-voltage storage battery by using the charging current corresponding to the design current of the low-voltage storage battery, so that the charging of the low-voltage storage battery by using the stable charging current is realized, the impact of the charging current on the low-voltage storage battery is avoided, and the service life of the low-voltage storage battery is prolonged.
In a second aspect, according to the method of the first aspect, another embodiment of the present disclosure further provides an onboard low-voltage battery charging method, as shown in fig. 2, the method mainly includes:
201. the LBMS detects whether the current holding capacity of the low-voltage storage battery is smaller than a second capacity threshold value; if the current held electric quantity is detected to be smaller than the second electric quantity threshold value, executing step 202; and if the current held electric quantity is not smaller than the second electric quantity threshold value, continuing to execute the step.
In practical application, in order to charge the low-voltage battery in time when the low-voltage battery is low in power, the LBMS detects whether the currently held power of the low-voltage battery is smaller than the second power threshold.
Specifically, if it is detected that the currently held power of the low-voltage battery is smaller than the second power threshold, it indicates that the power of the low-voltage battery is insufficient, and if the low-voltage battery is used for voltage output at this time, the low-voltage battery may be overdischarged to cause damage to the low-voltage battery, so that the low-voltage battery needs to be charged at this time, and step 202 is executed.
Specifically, if it is detected that the currently held electric quantity of the low-voltage battery is not less than the second electric quantity threshold value, it indicates that the low-voltage battery is in a state of insufficient electric quantity, and it indicates that the low-voltage battery is in a state of sufficient electric quantity, at this time, the low-voltage battery can be used for voltage output to supply power to the standby electric equipment connected with the low-voltage battery in the vehicle.
202. And if the LBMS detects that the current held electric quantity is smaller than the second electric quantity threshold value, sending a power supply request to the DCDC.
The LBMS sends a power supply request to the DCDC for the purpose of informing the DCDC to charge the low-voltage battery, and the method for sending the power supply request to the DCDC includes at least the following two methods:
first, the LBMS sends a power supply request to the DCDC, which informs the DCDC that it needs a charging voltage to be output to the low-voltage battery, but does not limit a specific voltage value of the charging voltage output by the DCDC.
Secondly, the LBMS determines a third target voltage value of the charging voltage output by the DCDC to the low-voltage battery based on the design current with the low-voltage battery; and the LBMS sends a power supply request carrying the third target voltage value to the DCDC. Wherein the third target voltage value is determined according to the design current and the resistance of the DCDC, that is, the third target voltage value is a product of the design current and the resistance of the DCDC. In this way, when the DCDC starts to output the charging voltage to the low-voltage battery, the DCDC can output the charging voltage that meets the charging requirement of the low-voltage battery to the low-voltage battery.
203. The DCDC outputs a charging voltage to the low-voltage secondary battery at a power supply request of the LBMS.
The voltage value of the charging voltage output by the DCDC to the low-voltage storage battery is related to the power supply request of the LBMS, and the method comprises the following two conditions:
first, the power supply request is only for informing the DCDC of the charging voltage it needs to output to the low-voltage battery, but the specific voltage value of the charging voltage output by the DCDC is not limited. Then, the DCDC outputs the charging voltage to the low-voltage battery according to the power supply condition of the DCDC, the charging current corresponding to the design current and the charging voltage of the low-voltage battery may or may not be within the preset range, and the DCDC may receive the voltage adjustment request fed back by the LBMS at a high probability.
Secondly, the LBMS determines a third target voltage value of the charging voltage output by the DCDC to the low-voltage battery based on the design current of the low-voltage battery; the power supply request carries a third target voltage value. The DCDC outputs a charging voltage having a voltage value of the third target voltage value to the low-voltage secondary battery. In this way, when the DCDC starts to output the charging voltage to the low-voltage battery, the DCDC can output the charging voltage that meets the charging requirement of the low-voltage battery to the low-voltage battery.
204. Detecting whether a difference value between the design current of the low-voltage storage battery and the current charging current provided by the DCDC to the low-voltage storage battery is within a preset range; if the difference value is detected to be within the preset range, executing step 205; otherwise, step 206 is performed.
205. And if the LBMS detects that the difference value is within the preset range, the current charging current is used for charging the low-voltage storage battery.
206. The LBMS continuously detects whether the accumulated times of the difference value out of a preset range is greater than a preset time threshold value; if yes, go to 207; otherwise, 208 is performed.
Specifically, if the cumulative number of times that the LBMS continuously detects that the difference is not within the preset range is greater than the preset number threshold, the DCDC probability may not provide the charging current meeting the charging requirement of the low-voltage battery, which indicates that the DCDC may have a fault, and step 207 needs to be executed to enable the vehicle user to timely generate the DCDC fault problem.
Specifically, if the LBMS continuously detects that the accumulated number of times that the difference value is not within the preset range is not greater than the preset number threshold, the DCDC may further provide the charging current meeting the charging requirement of the low-voltage battery to the low-voltage battery in a voltage regulating manner, and continue to regulate the voltage of the DCDC, so step 208 is executed.
207. And if the LBMS continuously detects that the accumulated times of the difference value out of the preset range is greater than a preset time threshold value, sending alarm information to a specific alarm device, and finishing the current process.
Specifically, if the number of times that the LBMS continuously detects that the difference value is not within the preset range is greater than the preset number threshold, the DCDC rough rate cannot provide the charging current meeting the charging requirement of the low-voltage storage battery, which indicates that the DCDC may have a fault, and in order to enable a vehicle user to timely generate a DCDC fault problem, alarm information is sent to a specific alarm device.
Specifically, the specific alarm device is not specifically limited in this embodiment, and optionally, the specific alarm device may include, but is not limited to, a car machine in a vehicle and a mobile terminal such as a mobile phone of a user. The alert information may include, but is not limited to, the following forms: text information, voice information, vibration information.
208. And if the LBMS detects that the difference value is not in the preset range, the LBMS sends a voltage adjustment request to the DCDC.
209. And the DCDC adjusts the charging voltage output to the low-voltage storage battery by the DCDC under the voltage adjusting request of the LBMS, and provides the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery.
210. The LBMS detects whether the current holding capacity of the low-voltage storage battery is larger than a first capacity threshold value; if the LBMS detects that the current held power is greater than the first power threshold, go to step 211; otherwise, 204 is performed.
Specifically, to avoid the overcharge condition of the low-voltage battery, the LBMS needs to detect whether the currently held charge of the low-voltage battery is greater than a first charge threshold.
Specifically, if the LBMS detects that the current held power of the low-voltage battery is greater than the first power threshold, it indicates that the low-voltage battery has been charged, and if the low-voltage battery continues to be charged, the low-voltage battery is likely to be overcharged, and the low-voltage battery is lost, then step 211 is executed.
Specifically, if the LBMS detects that the currently held power of the low-voltage battery is not greater than the first power threshold, which indicates that the charging of the low-voltage battery is not completed, step 204 is executed.
211. And if the LBMS detects that the current held electric quantity is larger than the first electric quantity threshold value, controlling the low-voltage storage battery to stop charging, and sending a power supply stopping request to the DCDC.
Specifically, if the LBMS detects that the current held power of the low-voltage battery is greater than the first power threshold, it indicates that the low-voltage battery has been charged, and if the low-voltage battery continues to be charged, the low-voltage battery is likely to be overcharged, and loss is caused to the low-voltage battery, the LBMS controls the low-voltage battery to stop charging, and sends a power supply stop request to the DCDC, so that the DCDC stops outputting the charging voltage to the low-voltage battery.
212. The DCDC stops outputting the charging voltage to the low-voltage secondary battery in response to a power supply stop request of the LBMS.
In a third aspect, another embodiment of the present disclosure further provides an onboard low-voltage battery charging apparatus according to the method shown in fig. 1 or fig. 2, as shown in fig. 3, the apparatus mainly comprising:
a battery detection unit 31 for detecting whether a difference between a design current of a low-voltage battery and a current charging current supplied to the low-voltage battery by an on-board voltage transformation unit 32 is within a preset range; if the difference value is detected to be within the preset range, charging the low-voltage storage battery by using the current charging current; if the difference value is not detected to be within the preset range, sending a voltage adjustment request to the vehicle-mounted voltage transformation unit 32;
and an on-vehicle voltage transforming unit 32 configured to adjust a charging voltage output to the low-voltage battery by the on-vehicle voltage transforming unit in response to a voltage adjustment request from the battery detecting unit 31, and supply a charging current corresponding to the charging voltage as a present charging current to the low-voltage battery.
The vehicle-mounted low-voltage storage battery charging device provided by the embodiment of the disclosure completes charging of the low-voltage storage battery by the vehicle-mounted voltage transformation unit through interaction between the storage battery detection unit and the vehicle-mounted voltage transformation unit. In the interaction process, the storage battery detection unit detects whether the difference value between the design current of the low-voltage storage battery and the current charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery is within a preset range. And if the storage battery detection unit detects that the difference value is within the preset range, the current charging current is used for charging the low-voltage storage battery. If the battery detection unit detects that the difference value is not within the preset range, the battery detection unit sends a voltage adjustment request to the vehicle-mounted voltage transformation unit. The vehicle-mounted voltage transformation unit adjusts the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit, and provides the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery. Therefore, when the vehicle-mounted voltage transformation unit charges the low-voltage storage battery, the vehicle-mounted voltage transformation unit is controlled to charge the low-voltage storage battery by using the charging current corresponding to the design current of the low-voltage storage battery, so that the charging of the low-voltage storage battery by using the stable charging current is realized, the impact of the charging current on the low-voltage storage battery is avoided, and the service life of the low-voltage storage battery is prolonged.
In some embodiments, as shown in fig. 4, the on-board voltage transforming unit includes:
a first determining module 321, configured to determine, as a first target voltage value, a sum of a voltage value of a charging voltage currently output to the low-voltage battery and a first preset step value under a voltage adjustment request of the battery detection unit, where the voltage adjustment request carries information that the design current is greater than the current charging current;
and a first adjusting module 322, configured to adjust the charging voltage with the voltage value equal to the first target voltage value, output to the low-voltage battery by the vehicle-mounted voltage transforming unit.
In some embodiments, as shown in fig. 4, the on-board voltage transformation unit 32 includes:
a first determining module 321, configured to determine, as a second target voltage value, a difference between a voltage value of a charging voltage currently output to the low-voltage battery and a second preset step value in a voltage adjustment request of the battery detecting unit 31, where the voltage adjustment request carries information that the design current is smaller than the current charging current;
the first determining module 321 is configured to adjust the charging voltage, which is output to the low-voltage battery by the vehicle-mounted voltage transforming unit 32 and has the voltage value equal to the second target voltage value.
In some embodiments, as shown in fig. 4, the battery detection unit includes:
a second determination module 311 for determining a desired voltage value based on the design current associated with the low-voltage battery;
a sending module 312, configured to send a voltage adjustment request carrying the expected voltage value to the on-board voltage transforming unit 32;
the on-vehicle voltage transforming unit 32 includes:
and a second adjusting module 323, configured to adjust the charging voltage with the voltage value equal to the desired voltage value, output to the low-voltage battery by the vehicle-mounted voltage transforming unit 32.
In some embodiments, as shown in fig. 4, the on-board voltage transformation unit 32 further includes:
a third determining module 324, configured to determine whether a difference between a voltage value of the charging voltage currently output to the low-voltage battery by the vehicle voltage transforming unit 32 and the expected voltage value is not greater than a preset difference, where the preset difference is used to limit a voltage adjustment manner of the vehicle voltage transforming unit;
a second adjusting module 323, configured to adjust the charging voltage with the voltage value equal to the expected voltage value output to the low-voltage battery by the vehicle-mounted voltage transforming unit 32 if the third determining module 323 determines that the difference is not greater than the preset difference;
a third adjusting module 325, configured to determine the number of voltage adjustments and the voltage value of each adjustment if the third determining module 323 determines that the difference is greater than the preset difference, and adjust the output voltage of the vehicle-mounted voltage transforming unit 32 multiple times according to the number of voltage adjustments and the voltage value of each adjustment until the voltage value of the charging voltage output by the vehicle-mounted voltage transforming unit is the expected voltage value.
In some embodiments, as shown in fig. 4, the battery detection unit further includes:
the first detection module 313 is used for detecting whether the current held electric quantity of the low-voltage storage battery is larger than a first electric quantity threshold value before the difference value between the current charging current provided by the vehicle-mounted voltage transformation unit 32 to the low-voltage storage battery and the design current of the low-voltage storage battery is within a preset range; if the current held electric quantity is detected to be larger than the first electric quantity threshold value, controlling the low-voltage storage battery to stop charging, and sending a power supply stop request to the vehicle-mounted voltage transformation unit 32;
the vehicle-mounted voltage transforming unit 32 is configured to stop outputting the charging voltage to the low-voltage battery in response to a power supply stop request from the first detecting module 313.
In some embodiments, as shown in fig. 4, the battery detection unit 31 further includes:
a second detection module 314, configured to detect whether a currently held electric quantity of the low-voltage battery is smaller than a second electric quantity threshold; if the current held electric quantity is detected to be smaller than the second electric quantity threshold value, sending a power supply request to the vehicle-mounted voltage transformation unit 32;
the vehicle-mounted voltage transforming unit 32 is configured to output a charging voltage to the low-voltage battery under the power supply request of the second detecting module 314.
In some embodiments, as shown in fig. 4, a second detection module 314 for determining a third target voltage value of the charging voltage output by the on-board voltage transforming unit 32 to the low-voltage battery based on the design current of the low-voltage battery; and sending the power supply request carrying the third target voltage value to the vehicle-mounted voltage transformation unit 32.
In some embodiments, as shown in fig. 4, the battery detection unit 31 is configured to, after detecting that the difference value is not within the preset range, charge the low-voltage battery with the current charging current if it is determined that the design current is greater than the current charging current before sending a voltage adjustment request to the on-board voltage transformation unit 32; if the design current is determined to be less than the current charging current, a voltage adjustment request is sent to the vehicle-mounted voltage transformation unit 32.
In some embodiments, as shown in fig. 4, the vehicle-mounted voltage transforming unit 32 is configured to output the charging voltage with the second target voltage value to the low-voltage battery.
In some embodiments, as shown in fig. 4, the apparatus further comprises:
the vehicle control unit 33 is configured to receive the voltage adjustment request sent by the battery detection unit S31 through a CAN bus, and forward the voltage adjustment request to the vehicle-mounted voltage transformation unit 32.
In some embodiments, as shown in fig. 4, the battery detection unit 31 is further configured to send an alarm message to a specific alarm device if the accumulated number of times that the difference value is continuously detected not to be within the preset range is not less than the preset number threshold.
In some embodiments, as shown in fig. 4, the battery detection unit 31 is further configured to determine the design current according to a current holding capacity of the low-voltage battery, where the holding capacities in different holding capacity intervals correspond to different design currents.
The vehicle-mounted low-voltage battery charging device provided by the embodiment of the third aspect can be used for executing the vehicle-mounted low-voltage battery charging method provided by the embodiment of the first aspect or the second aspect, and the related meanings and specific implementation manners can be referred to the related descriptions in the embodiment of the first aspect or the second aspect, and are not described in detail herein.
In a fourth aspect, another embodiment of the present disclosure also provides a vehicle mounted with, as shown in fig. 5, the vehicle mainly including:
a low-voltage battery 41, a power interface 42, and the vehicle-mounted low-voltage battery charging device 43 according to the third aspect, wherein the low-voltage battery 41 is connected to the power interface 42;
the low-voltage storage battery 41 is used for receiving the charging effect of the vehicle-mounted low-voltage storage battery charging device 43 and charging; providing a voltage to the power interface 42 when the power interface 42 requests a voltage;
the power interface 42 is used for transmitting the voltage provided by the low-voltage storage battery 41 to the standby electric equipment connected with the low-voltage storage battery.
Specifically, the power interface is used for connecting with a standby electric device, wherein the standby electric device may include, but is not limited to, any one of the following: car carried telephone, portable DVD, mobile phone charger.
The vehicle provided by the embodiment of the disclosure completes the charging of the low-voltage storage battery by the vehicle-mounted voltage transformation unit through the interaction between the storage battery detection unit and the vehicle-mounted voltage transformation unit in the vehicle-mounted low-voltage storage battery charging device. In the interaction process, the storage battery detection unit detects whether the difference value between the design current of the low-voltage storage battery and the current charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery is within a preset range. And if the storage battery detection unit detects that the difference value is within the preset range, the current charging current is used for charging the low-voltage storage battery. If the battery detection unit detects that the difference value is not within the preset range, the battery detection unit sends a voltage adjustment request to the vehicle-mounted voltage transformation unit. The vehicle-mounted voltage transformation unit adjusts the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit, and provides the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery. Therefore, when the vehicle-mounted voltage transformation unit charges the low-voltage storage battery, the vehicle-mounted voltage transformation unit is controlled to charge the low-voltage storage battery by using the charging current corresponding to the design current of the low-voltage storage battery, so that the charging of the low-voltage storage battery by using the stable charging current is realized, the impact of the charging current on the low-voltage storage battery is avoided, and the service life of the low-voltage storage battery is prolonged.
The vehicle provided by the embodiment of the fourth aspect may be used to execute the vehicle-mounted low-voltage battery charging method provided by the embodiment of the first aspect or the second aspect, and the related meanings and specific implementation manners may be referred to the related descriptions in the embodiment of the first aspect or the second aspect, and will not be described in detail herein.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, embodiments of the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, embodiments of the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present disclosure may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and so forth) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims (16)

1. A method of charging an on-board low voltage battery, the method comprising:
the storage battery detection unit detects whether a difference value between a design current of a low-voltage storage battery and a current charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery is within a preset range;
if the storage battery detection unit detects that the difference value is not within the preset range, the storage battery detection unit sends a voltage adjustment request to the vehicle-mounted voltage transformation unit;
and the vehicle-mounted voltage transformation unit adjusts the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit, and provides the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery.
2. The method according to claim 1, wherein the voltage adjustment request carries information that the design current is greater than the current charging current, and the on-board voltage transformation unit adjusts the charging voltage output to the low-voltage battery by the on-board voltage transformation unit in response to the voltage adjustment request of the battery detection unit, and comprises:
the vehicle-mounted voltage transformation unit determines the sum of the voltage value of the charging voltage currently output to the low-voltage storage battery and a first preset step value as a first target voltage value under the voltage adjustment request of the storage battery detection unit;
and the vehicle-mounted voltage transformation unit adjusts the charging voltage of which the voltage value is the first target voltage value and outputs the charging voltage to the low-voltage storage battery.
3. The method according to claim 1, wherein the voltage adjustment request carries information that the design current is less than the current charging current, and the on-board voltage transformation unit adjusts the charging voltage output to the low-voltage battery by the on-board voltage transformation unit in response to the voltage adjustment request of the battery detection unit, and comprises:
the vehicle-mounted voltage transformation unit determines the difference between the voltage value of the charging voltage currently output to the low-voltage storage battery and a second preset step value as a second target voltage value under the voltage adjustment request of the storage battery detection unit;
and the vehicle-mounted voltage transformation unit adjusts the charging voltage of which the voltage value is the second target voltage value to be output to the low-voltage storage battery.
4. The method according to claim 1, wherein the step of sending a voltage adjustment request to the on-board voltage transforming unit by the battery detecting unit if the difference is not within the preset range comprises:
the storage battery detection unit determines an expected voltage value according to the design current of the low-voltage storage battery;
sending a voltage adjustment request carrying the expected voltage value to the vehicle-mounted voltage transformation unit;
the vehicle-mounted voltage transformation unit adjusts the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit, and the vehicle-mounted voltage transformation unit comprises:
and the vehicle-mounted voltage transformation unit adjusts the charging voltage of which the voltage value is the expected voltage value to be output to the low-voltage storage battery.
5. The method according to claim 4, wherein before the on-board voltage transforming unit adjusts the charging voltage whose output voltage value to the low-voltage battery is the desired voltage value, the method further comprises:
the vehicle-mounted voltage transformation unit determines whether the difference value between the voltage value of the charging voltage currently output to the low-voltage storage battery and the expected voltage value is not greater than a preset difference value, and the preset difference value is used for limiting the voltage adjustment mode of the vehicle-mounted voltage transformation unit;
if the difference value is not larger than the preset difference value, the vehicle-mounted voltage transformation unit adjusts the charging voltage of which the voltage value is the expected voltage value to be output to the low-voltage storage battery;
if the difference is larger than the preset difference, the vehicle-mounted voltage transformation unit determines the voltage adjustment times and the voltage value adjusted each time, and adjusts the output voltage of the vehicle-mounted voltage transformation unit for multiple times according to the voltage adjustment times and the voltage value adjusted each time until the voltage value of the output charging voltage is the expected voltage value.
6. The method of claim 1, wherein before the battery detection unit detects whether a difference between a design current of a low-voltage battery and a current charging current supplied to the low-voltage battery by an on-board voltage transformation unit is within a preset range, the method further comprises:
the storage battery detection unit detects whether the current held electric quantity of the low-voltage storage battery is larger than a first electric quantity threshold value;
if the storage battery detection unit detects that the current held electric quantity is larger than the first electric quantity threshold value, the storage battery detection unit controls the low-voltage storage battery to stop charging and sends a power supply stop request to the vehicle-mounted voltage transformation unit;
and the vehicle-mounted voltage transformation unit stops outputting the charging voltage to the low-voltage storage battery under the power supply stopping request of the storage battery detection unit.
7. The method of claim 1, further comprising:
the storage battery detection unit detects whether the current held electric quantity of the low-voltage storage battery is smaller than a second electric quantity threshold value;
if the storage battery detection unit detects that the current held electric quantity is smaller than the second electric quantity threshold value, a power supply request is sent to the vehicle-mounted voltage transformation unit;
and the vehicle-mounted voltage transformation unit outputs charging voltage to the low-voltage storage battery under the power supply request of the storage battery detection unit.
8. The method according to claim 7, wherein the battery detection unit sends a power supply request to the vehicle-mounted transformer unit if it detects that the currently held power amount is smaller than the second power amount threshold, and the method comprises:
the storage battery detection unit determines a third target voltage value of the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit based on the design current of the low-voltage storage battery;
and the storage battery detection unit sends a power supply request carrying the third target voltage value to the vehicle-mounted voltage transformation unit.
9. The method according to claim 8, wherein the on-board voltage transforming unit outputs a charging voltage to the low-voltage battery upon a power supply request of the battery detecting unit, including:
and the voltage value output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit is the charging voltage of the third target voltage value.
10. The method according to claim 1, wherein the battery detection unit, after detecting that the difference value is not within the preset range, before sending a voltage adjustment request to the on-board voltage transformation unit, further comprises:
if the storage battery detection unit determines that the design current is larger than the current charging current, the current charging current is used for charging the low-voltage storage battery;
and if the storage battery detection unit determines that the design current is smaller than the current charging current, sending a voltage adjustment request to the vehicle-mounted voltage transformation unit.
11. The method according to any one of claims 1 to 10, wherein the step of sending a voltage adjustment request to the on-board voltage transforming unit by the battery detecting unit if the difference is not within the preset range comprises:
the storage battery detection unit sends the voltage adjustment request to a vehicle control unit through a CAN bus;
and the vehicle control unit forwards the voltage adjustment request sent by the storage battery detection unit to the vehicle-mounted voltage transformation unit.
12. The method according to any one of claims 1-10, further comprising:
and if the storage battery detection unit continuously detects that the accumulated times of the difference value out of the preset range is greater than a preset time threshold value, sending alarm information to a specific alarm device.
13. The method according to any one of claims 1-10, further comprising:
and determining the design current according to the current held electric quantity of the low-voltage storage battery, wherein the held electric quantities in different held electric quantity intervals correspond to different design currents.
14. An on-board low-voltage battery charging apparatus, comprising:
the storage battery detection unit is used for detecting whether a difference value between the design current of the low-voltage storage battery and the current charging current provided by the vehicle-mounted voltage transformation unit for the low-voltage storage battery is within a preset range or not; if the difference value is detected not to be within the preset range, sending a voltage adjustment request to the vehicle-mounted voltage transformation unit;
and the vehicle-mounted voltage transformation unit is used for adjusting the charging voltage output to the low-voltage storage battery by the vehicle-mounted voltage transformation unit under the voltage adjustment request of the storage battery detection unit and providing the charging current corresponding to the charging voltage as the current charging current for the low-voltage storage battery.
15. The apparatus of claim 14, further comprising:
and the vehicle control unit is used for receiving the voltage adjustment request sent by the storage battery detection unit through a CAN bus and forwarding the voltage adjustment request to the vehicle-mounted voltage transformation unit.
16. A vehicle, characterized in that the vehicle comprises: a low-voltage battery, a power interface and an onboard low-voltage battery charging device according to claim 14 or 15, wherein the low-voltage battery is connected to the power interface;
the low-voltage storage battery is used for charging under the action of the vehicle-mounted low-voltage storage battery charging device; providing a voltage to the power interface when the power interface requests a voltage;
and the power interface is used for transmitting the voltage provided by the low-voltage storage battery to standby electric equipment connected with the low-voltage storage battery.
CN202011344786.0A 2020-11-25 2020-11-25 Vehicle-mounted low-voltage storage battery charging method and device and vehicle Pending CN112531826A (en)

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