CN112277618B - Method and device for controlling electric balance of 48V electric system of automobile - Google Patents
Method and device for controlling electric balance of 48V electric system of automobile Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
- B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
- B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
- B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
- B60K6/28—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the electric energy storing means, e.g. batteries or capacitors
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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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
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/92—Energy efficient charging or discharging systems for batteries, ultracapacitors, supercapacitors or double-layer capacitors specially adapted for vehicles
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Abstract
The application relates to an electric balance control method and device for a 48V electric system of an automobile, relating to the technical field of electronic control of automobile, wherein the method comprises the following steps: monitoring the current vehicle operating state and the 48V electrical system operating load of the target vehicle; according to the current working state of the target vehicle and the preset power supply priority of the 48V electrical system, and in combination with a preset electric balance rule, the 48V electrical system is supplied with power by using an external power supply device, a BSG motor or a power battery of the target vehicle; among the power supply priorities of the 48V electric system, the power supply priorities of the external power supply device, the BSG motor and the power battery are sequentially reduced. This application carries out electric balance control to the vehicle, realizes the stable controllable parallel output of many constant voltage sources for external power supply unit obtains make full use of in whole car operating mode distribution, has promoted power supply unit's reliability.
Description
Technical Field
The invention relates to the technical field of automobile electronic control, in particular to an electric balance control method and device for an automobile 48V electric system.
Background
A48V hybrid electric vehicle is developed by mixing on the basis of a traditional vehicle, and is additionally provided with a Belt-Driven Starter Generator (BSG) motor and a 48V battery on the basis of the traditional vehicle in order to realize some functions specific to a hybrid system.
The conventional automobile has no high-voltage component similar to that of the hybrid automobile, and the power Management of the conventional automobile is mainly weak current Management of a 24V/12V low-voltage System, while the power System of the hybrid automobile is compared with the power System of the conventional automobile, on the basis of the former and the latter, complex power electronic devices such as a motor (BSG), a Motor Controller (MCU), a power Battery pack and a Battery Controller (BMS) are added.
For the electrical balance of the traditional vehicle, the electrical balance is to discuss that the energy types among an engine, a storage battery and vehicle electrical appliances (loads) are relatively single, and the storage battery is equivalent to a charging and discharging capacitor, so that the condition that double constant voltage sources are connected in parallel does not exist.
For the design of a 48V hybrid electric vehicle with a solar energy and other external power supply devices, the electrical balance condition is more complicated than that of a traditional vehicle because the BSG motor has a power generation state and an electric state and is additionally provided with solar energy and other external constant voltage sources.
A48V hybrid electric vehicle usually uses solar energy under special working conditions, and a plurality of constant voltage sources are prevented from being connected in parallel; or under the condition that solar energy and the BSG generator are output in parallel, the output voltage is reduced by full-load output with lower power in the parallel power supply by utilizing the electrical performance of the power supply, and the output energy is supplemented by another power supply. However, the following problems are liable to occur in such a process:
1. an external power supply device such as solar energy is not fully utilized in the working condition distribution of the whole vehicle, and the energy-saving advantage of new energy is not fully exerted;
2. when multiple constant voltage sources are directly connected in parallel for output, the electric energy output state may be frequently switched under a critical working condition, so that the reliability and the durability of the system are reduced;
3. when the monitoring output voltage of a part of power supply controllers is inconsistent with the self control strategy setting, misdiagnosis is possible, and the reliability of the part is reduced.
Therefore, in order to obtain a stable and reliable electric balance effect, an electric balance control technology is provided to meet the current demand.
Disclosure of Invention
The application provides an electric balance control method and device for a 48V electric system of an automobile, which are used for carrying out electric balance control on the automobile, realizing stable and controllable parallel output of multiple constant voltage sources, fully utilizing an external power supply device in the distribution of the working conditions of the whole automobile and improving the reliability of power supply components.
In a first aspect, the present application provides a method for electrical balance control of a 48V electrical system of a vehicle, the method comprising the steps of:
monitoring the current vehicle operating state and the 48V electrical system operating load of the target vehicle;
according to the current working state of the target vehicle and the preset power supply priority of the 48V electrical system, combining with a preset electric balance rule, and utilizing an external power supply device, a BSG motor or a power battery of the target vehicle to supply power to the 48V electrical system; wherein,
in the power supply priority of the 48V electrical system, the power supply priority of the external power supply device, the BSG motor and the power battery is sequentially reduced;
the electrical balancing rules include: and when the current vehicle working state simultaneously meets the power generation conditions of the external power supply device and the BSG motor and the working load of the 48V electrical system is greater than the output capacity of the external power supply device, jointly supplying power to the 48V electrical system by using the external power supply device and the BSG motor.
Specifically, the external power supply device is a solar power generation device.
Specifically, the electrical balance rule includes:
and when the current vehicle working state meets the power generation condition of an external power supply device and the working load of the 48V electrical system is not greater than the output capacity of the external power supply device, performing single-power supply on the 48V electrical system by using the external power supply device.
Specifically, the electrical balance rule includes:
and when the current vehicle working state meets the power generation conditions of the external power supply device and the BSG motor and the power battery, and the working load of the 48V electrical system is greater than the sum of the output capacities of the external power supply device and the BSG motor, jointly supplying power to the 48V electrical system by using the external power supply device, the BSG motor and the power battery.
Further, the electrical balance rule further comprises:
and when the current vehicle working state does not meet the external power supply device but meets the power generation condition of the BSG motor and the working load of the 48V electrical system is not greater than the output capacity of the BSG motor, performing single power supply on the 48V electrical system by using the BSG motor.
Further, the electrical balance rule further comprises:
and when the current vehicle working state does not meet the power generation condition of an external power supply device, but meets the power generation conditions of the BSG motor and the power battery, and the working load of the 48V electrical system is greater than the output capacity of the BSG motor, jointly supplying power to the 48V electrical system by using the BSG motor and the power battery.
Further, the electrical balance rule further comprises:
and when the current vehicle working state does not meet the power generation conditions of the external power supply device and the BSG motor but meets the power generation condition of the power battery, performing single-power supply on the 48V electric system by using the power battery.
In a second aspect, the present application provides an automotive 48V electrical system electrical balance control apparatus, the apparatus comprising:
the work monitoring module is used for monitoring the current vehicle working state of the target vehicle and the 48V electric system work load;
the electric balance regulation and control module is used for supplying power to the 48V electrical system by utilizing an external power supply device, a BSG motor or a power battery of the target vehicle according to the current working state of the target vehicle and the preset power supply priority of the 48V electrical system and combining with a preset electric balance rule; wherein,
in the power supply priority of the 48V electrical system, the power supply priority of the external power supply device, the BSG motor and the power battery is sequentially reduced;
the electrical balancing rules include: and when the current vehicle working state simultaneously meets the power generation conditions of the external power supply device and the BSG motor and the working load of the 48V electrical system is greater than the output capacity of the external power supply device, jointly supplying power to the 48V electrical system by using the external power supply device and the BSG motor.
Specifically, the external power supply device is a solar power generation device.
The beneficial effect that technical scheme that this application provided brought includes:
this application carries out electric balance control to the vehicle, realizes the stable controllable parallel output of many constant voltage sources for external power supply unit obtains make full use of in whole car operating mode distribution, has promoted power supply unit's reliability.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flowchart illustrating steps of a method for controlling electrical balance in a 48V electrical system of a vehicle according to an embodiment of the present invention;
FIG. 2 is a schematic block diagram of an electrical balance control method for a 48V electrical system of an automobile according to an embodiment of the present invention;
fig. 3 is a schematic diagram of an electrical balance architecture of an electrical balance control method for a 48V electrical system of an automobile according to an embodiment of the present application;
fig. 4 is a block diagram of a structure of an electric balance control device of an automotive 48V electrical system according to a second embodiment of the present application.
Detailed Description
Interpretation of terms:
BSG, Belt-drive Starter Generator, Belt drive and start and power generation integrated machine;
TEG, Thermo Electric Generator, thermoelectric Generator, also known as thermoelectric Generator;
MCU, Micro Controller Unit, motor Controller;
BMS, Battery Management System, Power Battery pack and Battery controller;
SOC, State Of Charge, State Of Charge;
VCU, Vehicle Control Unit;
HCU, Hybrid Control Unit, Hybrid vehicle Control Unit;
PCU, Power Control Unit, energy management controller;
EECU, Engine Electronic Control Unit, Engine controller;
BCM, Body Control Module, Body controller.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
The embodiment of the invention provides an electric balance control method and device for a 48V electric system of an automobile, which are used for carrying out electric balance control on the automobile and realizing stable and controllable parallel output of multiple constant voltage sources, so that an external power supply device is fully utilized in the distribution of the working conditions of the whole automobile, and the reliability of power supply components is improved.
In order to achieve the technical effects, the general idea of the application is as follows:
a method of controlling the electrical balance of a 48V electrical system of a vehicle, the method comprising the steps of:
s1, monitoring the current vehicle working state of the target vehicle and the 48V electric system working load;
s2, supplying power to the 48V electrical system by using an external power supply device, a BSG motor or a power battery of the target vehicle according to the current working state of the target vehicle and the preset power supply priority of the 48V electrical system and in combination with a preset electric balance rule; wherein,
in the power supply priority of the 48V electric system, the power supply priority of the external power supply device, the BSG motor and the power battery is reduced in sequence.
Embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
Example one
Referring to fig. 1 to 3, an embodiment of the present invention provides an electric balance control method for a 48V electrical system of an automobile, including the following steps:
s1, monitoring the current vehicle working state of the target vehicle and the 48V electric system working load;
s2, supplying power to the 48V electrical system by using an external power supply device, a BSG motor or a power battery of the target vehicle according to the current working state of the target vehicle and the preset power supply priority of the 48V electrical system and in combination with a preset electric balance rule; wherein,
in the power supply priority of the 48V electric system, the power supply priority of the external power supply device, the BSG motor and the power battery is reduced in sequence.
When an external power supply device such as a solar power generation device is connected to a corresponding 48V electrical system, a corresponding DC-DC is disposed in each device
Specifically, the external power supply device is a solar power generation device.
In the embodiment of the application, the electric balance control is carried out on the vehicle, the stable and controllable parallel output of multiple constant voltage sources is realized, the external power supply device is fully utilized in the distribution of the working conditions of the whole vehicle, and the reliability of a power supply part is improved.
The embodiment of the application particularly relates to multi-energy management of a 48V electric system of a vehicle, and the energy management system comprises a power battery, a BSG motor, external power supply devices such as a solar power generation device and the like, wherein the number of energy sources is more than 3;
the PCU dynamically monitors the power generation conditions of external power supply devices such as a solar power generation device and the like, the working state of the existing energy and load of a 48V system, the vehicle speed state, the engine rotating speed state, the electronic accelerator state, the brake pedal state, the main power switch state and the ignition lock key state in real time.
The energy power supply priority principle in the embodiment of the application is as follows: external power supply devices such as a solar power generation device, etc. > BSG motor > power battery.
The energy in the embodiment of the present application is turned on in sequence: and the PCU controls the power supply of the single power supply firstly according to the priority order by combining the monitoring of the power generation condition of the power supply part, and controls the supplementary power supply of the related power supply by combining the monitoring of the power generation condition of the next-stage power supply part according to the priority order when the single power supply does not meet the load requirement.
The working state of the energy component in the embodiment of the application is as follows: an external power supply device such as solar energy is adopted, the output mode is a constant-voltage mode by default, and the current maximum capacity is adopted for output;
when the BSG motor supplies power independently or outputs power together with the power battery, a constant voltage module is adopted by default.
In the embodiment of the application, when two constant voltage sources are adopted to supply power in parallel (in the embodiment of the application, the solar power generation device and the BSG motor), a dual constant voltage source control mode is adopted, the PCU sets the output mode of the BSG motor to be constant voltage output, sets the output mode of the solar power generation device to be constant voltage output, and sets the output values of the two to be the maximum value of the current solar output capacity;
when more than two constant voltage sources are adopted for parallel power supply, if the number of the connected additional energy sources is more than 1 (such as a solar power generation device and a TEG tail gas power generation device), all external power supply devices adopt the same voltage and constant voltage output, and are regarded as a large power supply in a control strategy, and the control mode is finally equal to the double constant voltage source control mode.
Specifically, the electrical balance rule includes:
when the current vehicle working state meets the power generation condition of the external power supply device and the working load of the 48V electrical system is not greater than the output capacity of the external power supply device, the external power supply device is used for carrying out single-power supply on the 48V electrical system;
at this time, the 48V electrical system has a small workload, so that the normal operation of the 48V electrical system can be maintained only by using the external power supply device.
Further, the electrical balance rule further comprises:
when the current vehicle working state simultaneously meets the power generation conditions of the external power supply device and the BSG motor and the working load of the 48V electrical system is greater than the output capacity of the external power supply device, the external power supply device and the BSG motor are used for carrying out combined power supply on the 48V electrical system;
at this time, since the 48V electrical system has a large workload but does not exceed the range commonly borne by the external power supply device and the BSG motor, the normal operation of the 48V electrical system can be maintained by using the external power supply device and the BSG motor at the same time.
Further, the electrical balance rule further comprises:
when the current working state of the vehicle meets the power generation conditions of the external power supply device and the power generation conditions of the BSG motor and the power battery, and the working load of the 48V electrical system is greater than the sum of the output capacities of the external power supply device and the BSG motor, the 48V electrical system is supplied with power jointly by the external power supply device, the BSG motor and the power battery;
at this time, because the work load of the 48V electrical system is too large, the external power supply device, the BSG motor and the power battery are required to jointly supply power to bear the work load of the current 48V electrical system.
Further, the electrical balance rule further comprises:
when the current vehicle working state does not meet the external power supply device but meets the power generation condition of the BSG motor and the working load of the 48V electric system is not greater than the output capacity of the BSG motor, the BSG motor is used for carrying out single-power supply on the 48V electric system;
at this time, since the external power supply device cannot supply power and the load is low at this time, it is possible to supply power separately using the BSG motor.
Further, the electrical balance rule further comprises:
when the current vehicle working state does not meet the power generation condition of the external power supply device but meets the power generation condition of the BSG motor and the power battery, and the working load of the 48V electrical system is greater than the output capacity of the BSG motor, the BSG motor and the power battery are utilized to carry out combined power supply on the 48V electrical system;
at this time, the external power supply device cannot supply power, and the load is large at this time and exceeds the range independently borne by the BSG motor, so that the BSG motor and the power battery are jointly supplied with power.
Further, the electrical balance rule further comprises:
when the current vehicle working state does not meet the power generation conditions of the external power supply device and the BSG motor but meets the power generation condition of the power battery, the single power supply is carried out on the 48V electric system by using the power battery.
In the embodiment of the present application, the electrical balance state table of the 48V electrical system is shown in table 1:
TABLE 1
In the embodiment of the present application, the specific control rule is as follows:
1. when an external power supply device such as a solar power generation device has a power generation condition, that is, the input voltage of the DC-DC of the external power supply device such as the solar power generation device is greater than or equal to a first input voltage, denoted by X1, which can be calibrated, for example, 50V, and the load is not greater than the output capability of the external power supply device, that is, the output current of the DC-DC of the external power supply device is less than the first output current, denoted by Y1, which can be calibrated, for example, 50A;
at this time, the PCU preferentially controls the external power supply device to supply power, and adopts a single power supply system of the external power supply device such as the solar power generation device, as in state 1, state 2, state 3, and state 4 in table 1. The solar energy adopts a constant voltage output mode.
2. When the power generation conditions of external power supply devices such as the solar power generation device and the like are not met, namely the DC-DC input voltage of the external power supply devices such as the solar power generation device and the like is smaller than the first input voltage, further judging according to the working condition of the whole vehicle:
2.1, when one of the following conditions is met, the BSG motor is indicated to have the power generation condition, and the PCU controls the BSG motor to supply power:
A) when the brake pedal is stepped down in the running process and the braking energy is recovered,
B) when the accelerator is released during running and the vehicle slides forwards,
C) when the engine speed is greater than the first speed value, denoted as Z, which can be calibrated, for example 400rpm, and the SOC of the power battery is below 50%,
at this time, as in state 5 and state 6 in table 1, the BSG motor adopts a constant torque output mode;
when the BSG motor is singly powered and cannot meet the load power supply requirement, namely the output current of the BSG motor is larger than or equal to the second output current at the moment, the output current is marked as Y2, the output current can be calibrated, generally, the output current is an external characteristic table obtained according to a BSG motor bench test, the upper limit of the current output current is checked according to the current rotating speed during table checking, the PCU controls the power battery to supply power additionally, and if the state is 7, the BSG motor adopts a constant-torque output mode.
And 2.2, when the power generation condition of the BSG motor is not available or the BSG motor is in an electric state, the PCU controls the power battery to supply power, such as the state 8 and the state 9 in the table 1.
When the power generation conditions of an external power supply device such as a solar power generation device are met and the load is larger than the output capacity of the external power supply device, the output current of the DC-DC of the external power supply device is smaller than the first output current, and the PCU controls the BSG motor or the power battery to supply power besides controlling the external power supply device to supply power.
3.1, when one of the following conditions is met, the BSG motor has the power generation condition:
A) when the brake pedal is stepped down in the running process and the braking energy is recovered,
B) when the accelerator is released during running and the vehicle slides forwards,
C) when the engine speed is greater than Z (which can be calibrated, such as 400rpm), and the SOC of the power battery is below 50 percent,
the PCU controls the BSG motor to supply power in conjunction with an external power supply, as in states 10, 11,
the external power supply devices such as the solar power generation device and the BSG motor adopt a constant voltage output mode, and the output values of the external power supply devices and the BSG motor are set to be the maximum value of the output capacity of the current external power supply devices such as the solar power generation device.
And 3.2, when the power generation condition of the BSG motor is not met or the BSG motor is in an electric state, the PCU controls the power battery to be matched with an external power supply device to supply power, such as a state 12 and a state 13.
4. When the power generation conditions of external power supply devices such as a solar power generation device and the like and the power generation conditions of a BSG motor are both met and two energy sources cannot meet the 48V load requirement of the whole vehicle,
at this time, the output current of the BSG motor is greater than or equal to the third output current, which is recorded as Y3, and the value can be calibrated, generally, according to the external characteristic table obtained by the bench test of the BSG motor, the upper limit of the current output current is checked according to the current rotating speed when the table is checked,
the PCU controls the power battery to supply power cooperatively, as in state 14,
and the external power supply devices such as the solar power generation device and the BSG motor adopt a constant voltage output mode, and the output values of the external power supply devices and the BSG motor are set to be the maximum value of the output capacity of the current external power supply devices such as the solar power generation device.
It should be noted that the software carrier of the control method in the embodiment of the present application may be integrated in the vehicle control unit VCU or HCU, or integrated in the energy management controller PCU, or internal to the engine controller EECU or the vehicle body controller BCM, and the related components are controlled by bus signals or hard wires, which are all within the scope of the embodiment of the present application;
the vehicle in the embodiment of the application is in a 48V hybrid electric system form, and is both the implementation manner of the embodiment of the application, wherein a 12V electrical system traditional storage battery is in a 12V specification, high-low voltage conversion DC-DC is in a 48V to 12V specification, a 24V electrical system traditional storage battery is in a 24V specification, and high-low voltage conversion DC-DC is in a 48V to 24V specification;
the external power supply device is a solar power generation device which is only one example of the embodiment of the application, and a TEG tail gas power generation device and the like can provide electric energy to a 48V system in a mode of generating electricity by utilizing waste gas;
when more than two constant voltage sources are adopted for parallel power supply, if the number of the connected additional energy sources is more than 1 (such as a solar power generation device and a tail gas TEG tail gas power generation device), all external power supply devices adopt the same voltage and constant voltage output, and are regarded as a large power supply in a control strategy and finally equal to the double constant voltage source control mode;
the 48V electric air conditioner is only one example of the load in the embodiment of the present application, and the 48V loads such as electric turbocharging and electric power steering are all specific examples of the realized load.
Example two
Referring to fig. 4, an embodiment of the present invention provides an electrical balance control device for a 48V electrical system of an automobile, including:
the work monitoring module is used for monitoring the current vehicle working state of the target vehicle and the 48V electric system work load;
the electric balance regulation and control module is used for supplying power to the 48V electrical system by utilizing an external power supply device, a BSG motor or a power battery of the target vehicle according to the current working state of the target vehicle and the preset power supply priority of the 48V electrical system and combining with a preset electric balance rule; wherein,
in the power supply priority of the 48V electric system, the power supply priority of the external power supply device, the BSG motor and the power battery is reduced in sequence.
When an external power supply device such as a solar power generation device is connected to a corresponding 48V electrical system, a corresponding DC-DC is disposed in each device
Specifically, the external power supply device is a solar power generation device.
In the embodiment of the application, the electric balance control is carried out on the vehicle, the stable and controllable parallel output of multiple constant voltage sources is realized, the external power supply device is fully utilized in the distribution of the working conditions of the whole vehicle, and the reliability of a power supply part is improved.
The embodiment of the application particularly relates to multi-energy management of a 48V electric system of a vehicle, and the energy management system comprises a power battery, a BSG motor, external power supply devices such as a solar power generation device and the like, wherein the number of energy sources is more than 3;
the PCU dynamically monitors the power generation conditions of external power supply devices such as a solar power generation device and the like, the working state of the existing energy and load of a 48V system, the vehicle speed state, the engine rotating speed state, the electronic accelerator state, the brake pedal state, the main power switch state and the ignition lock key state in real time.
The energy power supply priority principle in the embodiment of the application is as follows: external power supply devices such as a solar power generation device, etc. > BSG motor > power battery.
The energy in the embodiment of the present application is turned on in sequence: and the PCU controls the power supply of the single power supply firstly according to the priority order by combining the monitoring of the power generation condition of the power supply part, and controls the supplementary power supply of the related power supply by combining the monitoring of the power generation condition of the next-stage power supply part according to the priority order when the single power supply does not meet the load requirement.
The working state of the energy component in the embodiment of the application is as follows: an external power supply device such as solar energy is adopted, the output mode is a constant-voltage mode by default, and the current maximum capacity is adopted for output;
when the BSG motor supplies power independently or outputs power together with the power battery, a constant voltage module is adopted by default.
In the embodiment of the application, when two constant voltage sources are adopted to supply power in parallel (in the embodiment of the application, the solar power generation device and the BSG motor), a dual constant voltage source control mode is adopted, the PCU sets the output mode of the BSG motor to be constant voltage output, sets the output mode of the solar power generation device to be constant voltage output, and sets the output values of the two to be the maximum value of the current solar output capacity;
when more than two constant voltage sources are adopted for parallel power supply, if the number of the connected additional energy sources is more than 1 (such as a solar power generation device and a TEG tail gas power generation device), all external power supply devices adopt the same voltage and constant voltage output, and are regarded as a large power supply in a control strategy, and the control mode is finally equal to the double constant voltage source control mode.
Specifically, the electrical balance rule includes:
when the current vehicle working state meets the power generation condition of the external power supply device and the working load of the 48V electrical system is not greater than the output capacity of the external power supply device, the external power supply device is used for carrying out single-power supply on the 48V electrical system;
at this time, the 48V electrical system has a small workload, so that the normal operation of the 48V electrical system can be maintained only by using the external power supply device.
Further, the electrical balance rule further comprises:
when the current vehicle working state simultaneously meets the power generation conditions of the external power supply device and the BSG motor and the working load of the 48V electrical system is greater than the output capacity of the external power supply device, the external power supply device and the BSG motor are used for carrying out combined power supply on the 48V electrical system;
at this time, since the 48V electrical system has a large workload but does not exceed the range commonly borne by the external power supply device and the BSG motor, the normal operation of the 48V electrical system can be maintained by using the external power supply device and the BSG motor at the same time.
Further, the electrical balance rule further comprises:
when the current working state of the vehicle meets the power generation conditions of the external power supply device and the power generation conditions of the BSG motor and the power battery, and the working load of the 48V electrical system is greater than the sum of the output capacities of the external power supply device and the BSG motor, the 48V electrical system is supplied with power jointly by the external power supply device, the BSG motor and the power battery;
at this time, because the work load of the 48V electrical system is too large, the external power supply device, the BSG motor and the power battery are required to jointly supply power to bear the work load of the current 48V electrical system.
Further, the electrical balance rule further comprises:
when the current vehicle working state does not meet the external power supply device but meets the power generation condition of the BSG motor and the working load of the 48V electric system is not greater than the output capacity of the BSG motor, the BSG motor is used for carrying out single-power supply on the 48V electric system;
at this time, since the external power supply device cannot supply power and the load is low at this time, it is possible to supply power separately using the BSG motor.
Further, the electrical balance rule further comprises:
when the current vehicle working state does not meet the power generation condition of the external power supply device but meets the power generation condition of the BSG motor and the power battery, and the working load of the 48V electrical system is greater than the output capacity of the BSG motor, the BSG motor and the power battery are utilized to carry out combined power supply on the 48V electrical system;
at this time, the external power supply device cannot supply power, and the load is large at this time and exceeds the range independently borne by the BSG motor, so that the BSG motor and the power battery are jointly supplied with power.
Further, the electrical balance rule further comprises:
when the current vehicle working state does not meet the power generation conditions of the external power supply device and the BSG motor but meets the power generation condition of the power battery, the single power supply is carried out on the 48V electric system by using the power battery.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present application and are presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. An electric balance control method for a 48V electric system of an automobile is characterized by comprising the following steps:
monitoring the current vehicle operating state and the 48V electrical system operating load of the target vehicle;
according to the current working state of the target vehicle and the preset power supply priority of the 48V electrical system, combining with a preset electric balance rule, and utilizing an external power supply device, a BSG motor or a power battery of the target vehicle to supply power to the 48V electrical system; wherein,
in the power supply priority of the 48V electrical system, the power supply priority of the external power supply device, the BSG motor and the power battery is sequentially reduced;
the electrical balancing rules include: and when the current vehicle working state simultaneously meets the power generation conditions of the external power supply device and the BSG motor and the working load of the 48V electrical system is greater than the output capacity of the external power supply device, jointly supplying power to the 48V electrical system by using the external power supply device and the BSG motor.
2. The method of claim 1, wherein the external power supply is a solar power generator.
3. The automotive 48V electrical system electrical balance control method of claim 1, wherein the electrical balance rules comprise:
and when the current vehicle working state meets the power generation condition of an external power supply device and the working load of the 48V electrical system is not greater than the output capacity of the external power supply device, performing single-power supply on the 48V electrical system by using the external power supply device.
4. The automotive 48V electrical system electrical balance control method of claim 1, wherein the electrical balance rules comprise:
and when the current vehicle working state meets the power generation conditions of the external power supply device and the BSG motor and the power battery, and the working load of the 48V electrical system is greater than the sum of the output capacities of the external power supply device and the BSG motor, jointly supplying power to the 48V electrical system by using the external power supply device, the BSG motor and the power battery.
5. The automotive 48V electrical system electrical balance control method of claim 1, wherein the electrical balance rules further comprise:
and when the current vehicle working state does not meet the external power supply device but meets the power generation condition of the BSG motor and the working load of the 48V electrical system is not greater than the output capacity of the BSG motor, performing single power supply on the 48V electrical system by using the BSG motor.
6. The automotive 48V electrical system electrical balance control method of claim 1, wherein the electrical balance rules further comprise:
and when the current vehicle working state does not meet the power generation condition of an external power supply device, but meets the power generation conditions of the BSG motor and the power battery, and the working load of the 48V electrical system is greater than the output capacity of the BSG motor, jointly supplying power to the 48V electrical system by using the BSG motor and the power battery.
7. The automotive 48V electrical system electrical balance control method of claim 1, wherein the electrical balance rules further comprise:
and when the current vehicle working state does not meet the power generation conditions of the external power supply device and the BSG motor but meets the power generation condition of the power battery, performing single-power supply on the 48V electric system by using the power battery.
8. An automotive 48V electrical system electrical balance control apparatus, said apparatus comprising:
the work monitoring module is used for monitoring the current vehicle working state of the target vehicle and the 48V electric system work load;
the electric balance regulation and control module is used for supplying power to the 48V electrical system by utilizing an external power supply device, a BSG motor or a power battery of the target vehicle according to the current working state of the target vehicle and the preset power supply priority of the 48V electrical system and combining with a preset electric balance rule; wherein,
in the power supply priority of the 48V electrical system, the power supply priority of the external power supply device, the BSG motor and the power battery is sequentially reduced;
the electrical balancing rules include: and when the current vehicle working state simultaneously meets the power generation conditions of the external power supply device and the BSG motor and the working load of the 48V electrical system is greater than the output capacity of the external power supply device, jointly supplying power to the 48V electrical system by using the external power supply device and the BSG motor.
9. The automotive 48V electrical system electrical balance control of claim 8 wherein said external power supply is a solar power generation device.
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| KR20150111662A (en) * | 2014-03-26 | 2015-10-06 | 김흥태 | Intelligent power management system for electric propulsion system |
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| CN110978991A (en) * | 2019-12-18 | 2020-04-10 | 东风商用车有限公司 | Hybrid power commercial vehicle electrical system for power generation by solar energy and waste gas waste heat |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20150111662A (en) * | 2014-03-26 | 2015-10-06 | 김흥태 | Intelligent power management system for electric propulsion system |
| CN107433856A (en) * | 2016-05-25 | 2017-12-05 | 长城汽车股份有限公司 | Pure electric automobile energy management method and system |
| CN108515961A (en) * | 2018-03-29 | 2018-09-11 | 吉利汽车研究院（宁波）有限公司 | The DCDC control methods and system of 48V hybrid power systems |
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