CN214314567U - Power supply system for BRM motor and vehicle electrical system - Google Patents

Power supply system for BRM motor and vehicle electrical system Download PDF

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Publication number
CN214314567U
CN214314567U CN202021897719.7U CN202021897719U CN214314567U CN 214314567 U CN214314567 U CN 214314567U CN 202021897719 U CN202021897719 U CN 202021897719U CN 214314567 U CN214314567 U CN 214314567U
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China
Prior art keywords
brm
motor
power supply
voltage
electrical network
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CN202021897719.7U
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Chinese (zh)
Inventor
李庆丰
孙雪平
林超
章圣超
丁明峰
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Robert Bosch GmbH
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Robert Bosch GmbH
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Priority to CN202021897719.7U priority Critical patent/CN214314567U/en
Priority to DE102021208504.0A priority patent/DE102021208504A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/15—Control strategies specially adapted for achieving a particular effect
    • B60W20/19—Control strategies specially adapted for achieving a particular effect for achieving enhanced acceleration
    • 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B60L50/52—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells characterised by DC-motors
    • 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
    • B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
    • B60L58/20—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules having different nominal voltages
    • 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
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B60L2210/12—Buck converters
    • 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
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B60L2210/14—Boost converters
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Automation & Control Theory (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The utility model provides a power supply system for giving BRM motor power supply, it includes: a DCDC converter; the first power grid is connected with the high-voltage end of the DCDC converter, and at least a BRM motor and a first battery are connected with the first power grid; and a second power grid connected to the low-voltage end of the DCDC converter, wherein at least a second battery is connected. The DCDC converter comprises a step-up module for stepping up a second voltage at the low-voltage end of the DCDC converter to a first voltage at the high-voltage end of the DCDC converter, and in a first state of the BRM motor in which a predetermined input quantity of the BRM motor exceeds an input quantity threshold or a predetermined output quantity exceeds an output quantity threshold, a second electrical network of the power supply system is connected to the first electrical network via the step-up module of the DCDC converter and a second battery of the second electrical network supplies power to the BRM motor together with the first battery of the first electrical network. The utility model discloses still relate to corresponding vehicle electrical system. The utility model has the advantages of can full play BRM motor's performance to satisfy the high output demand and slow down the loss of 48V batteries.

Description

Power supply system for BRM motor and vehicle electrical system
Technical Field
The utility model relates to a power supply system and vehicle electrical system that is used for BRM motor (helping hand to retrieve the motor, and the english is Boost recovery Machine).
Background
The 48V light-mixed automobile has the advantages of good oil saving effect, low cost and the like, and is being popularized and developed by more and more automobile manufacturers. In a 48V mild hybrid vehicle, the 48V grid is connected to the 12V grid via a DCDC converter. DCDC converters are known that are capable of bidirectional power transmission, i.e. having both a buck function from 48V to 12V and a boost function from 12V to 48V. However, in the prior art, the boost function of the DCDC converter is used either at the start of the engine for precharging a load, for example an electric machine, in the 48V electrical system via the 12V electrical system; or when the 48V lithium battery is insufficient in electricity.
Because the power of the 48V lithium battery is limited, even if the 48V lithium battery is normal, the electric power input to the BRM motor is not enough to enable the BRM motor to operate fully, and the DCDC converter still outputs the energy of the 48V power grid to the 12V power grid in a voltage reduction mode at the moment, so that the output of the BRM motor is lower.
For this reason, corresponding improvements are required.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a power supply system and a vehicle electrical system for the BRM motor for can full play BRM motor's operational capability, in order to satisfy high BRM motor output demand.
According to the utility model discloses an aspect provides a power supply system for giving BRM motor power supply, and this power supply system includes: a DCDC converter; the first power grid is connected with the high-voltage end of the DCDC converter and is at a first voltage, and the BRM motor and the first battery are connected in the first power grid; and a second power grid connected to the low-voltage end of the DCDC converter and at a second voltage, wherein a second battery is connected to the second power grid, and the second voltage is lower than the first voltage. The DCDC converter comprises a step-up module for stepping up a second voltage at the low-voltage end of the DCDC converter to a first voltage at the high-voltage end of the DCDC converter, and in a first state of the BRM motor in which a predetermined input quantity of the BRM motor exceeds an input quantity threshold or a predetermined output quantity of the BRM motor exceeds an output quantity threshold, a second electrical network of the power supply system is connected to the first electrical network via the step-up module of the DCDC converter and a second battery of the second electrical network supplies power to the BRM motor together with the first battery of the first electrical network. The input quantity is, for example, the current or electric power input to the BRM motor, and the output quantity is, for example, the torque or power output by the BRM motor, but other quantities that will be considered as being of interest to those skilled in the art are also conceivable.
According to an optional embodiment of the utility model, the DCDC converter includes the step-down module of the second voltage of step-down to the low-voltage end of DCDC converter with the first voltage of the high-voltage end of DCDC converter, and in a BRM motor second state different with the first state of BRM motor, the first electric wire netting of power supply system is connected and first electric wire netting is transmitted power to the second electric wire netting via the step-down module of DCDC converter and second electric wire netting.
According to an optional embodiment of the present invention, when the predetermined input of the BRM motor is lower than the input threshold, or the predetermined output of the BRM motor is lower than the output threshold, or the voltage of the second battery is lower than a voltage threshold, the BRM motor is in the BRM motor second state, and at this time the first grid of the power supply system is connected to the second grid via the voltage reduction module of the DCDC converter and the first grid transmits power to the second grid.
According to an optional embodiment of the present invention, the power supply system further comprises a controller connected to the DCDC converter and adapted to switch the DCDC converter between a boost mode operating with the boost module and a buck mode operating with the buck module.
According to an optional embodiment of the present invention, the power supply system further comprises a control device for the boost module, when the control device is in the first state, the boost function of the boost module is activated, when the control device is in the second state, the boost function of the boost module is deactivated. The control device is, for example, a switching module, the boost function of which is active when the switching module is switched on and is inactive when the switching module is switched off.
According to an optional embodiment of the present invention, the controller is connected to or comprises the control device.
According to an optional embodiment of the present invention, when the control device is in the second state, the BRM motor is in the BRM motor second state, and at this time the first electric network of the power supply system is connected with the second electric network via the voltage-reducing module of the DCDC converter and the first electric network transmits power to the second electric network.
According to an optional embodiment of the present invention, the power supply system further comprises a second battery monitoring device, the second battery monitoring device being connected to the second battery and monitoring a voltage state of the second battery; and/or a starter is further connected in the second power grid, and the power supply system comprises a starter state monitoring device which is connected with the starter and monitors the state of the starter.
According to an optional embodiment of the invention, the controller is connected with the second battery monitoring device and/or the starter state monitoring device and receives a signal regarding a voltage state of the second battery and/or a state of the starter.
According to an optional embodiment of the present invention, the first electrical network is a 48V electrical network, the first battery is a 48V lithium battery, and/or the second electrical network is a 12V electrical network, the second battery is a 12V lead-acid battery.
According to a second aspect of the present invention, there is provided a vehicle electrical system comprising the aforementioned power supply system and comprising a BRM motor.
The utility model has the advantages of: the performance of the BRM motor can be improved; the BRM motor belt starting is more stable; higher peak power is obtained at recovery; furthermore, the hardware cost is not increased.
Drawings
The principles, features and advantages of the present invention may be better understood by describing the invention in more detail below with reference to the accompanying drawings. The drawings comprise:
fig. 1 shows an embodiment of a power supply system according to the invention.
Fig. 2 shows another embodiment of a power supply system according to the invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and a plurality of exemplary embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the invention.
Fig. 1 illustrates a power supply system for a BRM motor of a vehicle according to an exemplary embodiment of the present invention. As shown in fig. 1, the power supply system may include a first power grid 1, a second power grid 2, and a DCDC converter 3. The first electrical network 1 is electrically connected to the second electrical network 2 via a DCDC converter 3, wherein the first electrical network 1 is connected to the high-voltage side of the DCDC converter 3 and the second electrical network 2 is connected to the low-voltage side of the DCDC converter 3. The first electrical network 1 is, for example, a 48V network of a vehicle, and the second electrical network 2 is, for example, a 12V network of the vehicle. However, other values of the voltages of the first and second electrical network 1, 2 are also conceivable, as long as the voltage of the first electrical network 1 is higher than the voltage of the second electrical network 2. A BRM motor 11 and a first battery 12, which are, for example, a 48V BRM motor and a 48V lithium battery, are connected to the first power grid 1. Other power loads may also be connected to the first power network 1. At least a second battery 22 is connected to the second electrical network 2, the second battery 22 being, for example, a 12V lead-acid battery. The DCDC converter 3 includes a boost module 31, and the boost module 31 boosts the second voltage of the low voltage terminal of the DCDC converter 3 to the first voltage of the high voltage terminal of the DCDC converter 3. In a first state of the BRM motor in which the predefined input variable of the BRM motor 11 exceeds an input variable threshold or the predefined output variable of the BRM motor 11 exceeds an output variable threshold, the second electrical system 2 of the power supply system is connected to the first electrical system 1 via the step-up module 31 of the DCDC converter 3 and the second battery 22 of the second electrical system 2 supplies the BRM motor 11 together with the first battery 12 of the first electrical system 1. Thus, a higher input electric power can be provided to the BRM motor 11, so that a higher output can be provided by the BRM motor 11 to meet the vehicle demand. The input quantity may be, for example, electric current or electric power input to the BRM motor, and the output quantity may be, for example, torque or power output by the BRM motor. Here, the BRM motor first state occurs, for example, in a torque operating mode of the BRM motor 11, in which the BRM motor 11 supplies torque exactly as required.
A power supply system of another exemplary embodiment of the present invention is shown in fig. 2. Reference is made to the description of fig. 1 for features having the same reference numerals. For the sake of simplicity, the differences between the embodiment of fig. 2 and the embodiment of fig. 1 are mainly described below.
As shown in fig. 2, the DCDC converter 3 includes a step-down module 32 in addition to the step-up module 31, and the step-down module 32 steps down a first voltage at the high-voltage end of the DCDC converter 3 to a second voltage at the low-voltage end of the DCDC converter 3. In at least one second state of the BRM motor, which is different from the first state of the BRM motor, the first electrical network 1 of the power supply system is connected to the second electrical network 2 via the step-down module 32 of the DCDC converter 3 and the first electrical network 1 transmits power to the second electrical network 2.
According to an alternative embodiment, the power supply system further comprises a controller 4, said controller 4 being connected to the DCDC converter 3 and being able to switch the DCDC converter 3 between a boost mode operating in a boost module and a buck mode operating in a buck module.
According to an alternative embodiment, the power supply system further comprises a control means 311 for the boost module 31, e.g. a switch module, the boost function of the boost module 31 being active when the control means 311 is in a first state (e.g. the switch module is on) and the boost function of the boost module 31 being inactive when the control means 311 is in a second state (e.g. the switch module is off). Various types of control means, such as electrical or electronic switches, are conceivable here. When the second electrical system 2 is connected to the first electrical system 1 via the step-up module 31 of the DCDC converter 3, the control device 311 is to be in the first state.
According to an alternative embodiment, the controller 4 is connected to the control means 311 or comprises the control means 311. Here, the controller 4 can control the control device 311.
According to an alternative embodiment, the power supply system may further include a second battery monitoring device 221, the second battery monitoring device 221 being connected to the second battery 22 and monitoring a voltage status of the second battery 22. When the second electrical system 2 is connected to the first electrical system 1 via the step-up module 31 of the DCDC converter 3, the voltage state of the second battery 22 should not be too low, for example, should be at least above a voltage threshold.
A starter 21 is also generally connected to the second electrical network 2. According to an alternative embodiment, the power supply system may comprise a starter state monitoring device 211, said starter state monitoring device 211 being connected to the starter 21 and monitoring the state of the starter 21, for example monitoring whether the starter 21 is active or inactive.
According to an alternative embodiment, the controller 4 is communicatively connected to the second battery monitoring device 221 and/or the starter state monitoring device 211 and receives signals relating to the voltage state of the second battery 22 and/or the state of the starter 21.
According to an alternative embodiment, when the control device 311 is in the second state or the starter 21 is activated or the current or the electrical power to be supplied to the BRM motor is below a current threshold or an electrical power threshold, or the torque or the power to be supplied by the BRM motor 11 is below a torque threshold or a power threshold, or the voltage of the second battery 22 is too low, then the first electrical network 1 is connected to the second electrical network 2 via the step-down module 32 of the DCDC converter 3 and the first electrical network 1 transmits power to the second electrical network 2.
Although specific embodiments of the invention have been described herein in detail, they have been presented for purposes of illustration only and are not to be construed as limiting the scope of the invention. Various substitutions, alterations, and modifications may be devised without departing from the spirit and scope of the present invention.
List of reference numerals
1 first electric network
11 BRM motor
12 first battery
2 second grid
21 starter
211 starter state monitoring device
22 second battery
221 second battery state monitoring device
3 DCDC converter
31 boost module
311 control device
32 voltage reduction module
4 controller

Claims (10)

1. A power supply system for a BRM motor (11), the power supply system comprising:
-a DCDC converter (3);
-a first electrical network (1), the first electrical network (1) being connected to the high voltage side of the DCDC converter (3) and being at a first voltage, the first electrical network (1) having the BRM motor (11) and a first battery (12) connected therein;
-a second electrical network (2), the second electrical network (2) being connected to the low-voltage end of the DCDC converter (3) and being at a second voltage, a second battery (22) being connected in the second electrical network (2), the second voltage being lower than the first voltage,
it is characterized in that the preparation method is characterized in that,
the DCDC converter (3) comprises a step-up module (31) for stepping up a second voltage at the low-voltage end of the DCDC converter (3) to a first voltage at the high-voltage end of the DCDC converter (3), wherein in a first BRM motor state in which a predetermined input quantity of the BRM motor (11) exceeds an input quantity threshold or a predetermined output quantity of the BRM motor (11) exceeds an output quantity threshold, a second electrical network (2) of the power supply system is connected to the first electrical network (1) via the step-up module (31) of the DCDC converter (3) and a second battery (22) of the second electrical network (2) supplies power to the BRM motor (11) together with a first battery (12) of the first electrical network (1).
2. The power supply system according to claim 1,
the DCDC converter (3) comprises a buck module (32) for stepping down a first voltage at the high-voltage side of the DCDC converter (3) to a second voltage at the low-voltage side of the DCDC converter (3), the first electrical network (1) of the power supply system being connected to the second electrical network (2) via the buck module (32) of the DCDC converter (3) and the first electrical network (1) transmitting power to the second electrical network (2) in a second state of the BRM motor which is different from the first state of the BRM motor.
3. The power supply system of claim 2, wherein the BRM motor (11) is in the BRM motor second state when a predetermined input of the BRM motor (11) is below the input threshold, or a predetermined output of the BRM motor (11) is below the output threshold, or a voltage of the second battery (22) is below a voltage threshold.
4. The power supply system according to claim 2,
the power supply system further comprises a controller (4), the controller (4) being connected with the DCDC converter (3) and being adapted to switch the DCDC converter (3) between a boost mode operating with a boost module (31) and a buck mode operating with a buck module (32).
5. The power supply system according to claim 4,
the power supply system comprises a control means (311) for the boost module (31), the boost function of the boost module (31) being active when the control means (311) is in a first state, and the boost function of the boost module (31) being inactive when the control means (311) is in a second state.
6. The power supply system according to claim 5,
the controller (4) is connected to the control means (311) or comprises the control means (311); and/or
When the control device (311) is in a second state, the BRM motor (11) is in the BRM motor second state.
7. The power supply system according to claim 4,
the power supply system further comprises a second battery monitoring device (221), the second battery monitoring device (221) being connected with the second battery (22) and monitoring a voltage status of the second battery (22); and/or
A starter (21) is also connected in the second power grid (2), and the power supply system comprises a starter state monitoring device (211), wherein the starter state monitoring device (211) is connected with the starter (21) and monitors the state of the starter (21).
8. The power supply system according to claim 7,
the controller (4) is connected to the second battery monitoring device (221) and/or the starter state monitoring device (211) and receives signals relating to the voltage state of the second battery (22) and/or the state of the starter (21).
9. The power supply system according to claim 1 or 2,
the first electrical network (1) is a 48V electrical network, the first battery (12) is a 48V lithium battery; and/or
The second electrical network (2) is a 12V electrical network and the second battery (22) is a 12V lead acid battery.
10. A vehicle electrical system, characterized in that it comprises a BRM motor and a power supply system according to any one of claims 1 to 9.
CN202021897719.7U 2020-09-03 2020-09-03 Power supply system for BRM motor and vehicle electrical system Active CN214314567U (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202021897719.7U CN214314567U (en) 2020-09-03 2020-09-03 Power supply system for BRM motor and vehicle electrical system
DE102021208504.0A DE102021208504A1 (en) 2020-09-03 2021-08-05 Power supply system for a BRM engine and electrical system of a vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021897719.7U CN214314567U (en) 2020-09-03 2020-09-03 Power supply system for BRM motor and vehicle electrical system

Publications (1)

Publication Number Publication Date
CN214314567U true CN214314567U (en) 2021-09-28

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DE (1) DE102021208504A1 (en)

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