CN113415163A - Low-voltage power supply system of hybrid electric vehicle, control method and hybrid electric vehicle - Google Patents
Low-voltage power supply system of hybrid electric vehicle, control method and hybrid electric vehicle Download PDFInfo
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- CN113415163A CN113415163A CN202110874568.6A CN202110874568A CN113415163A CN 113415163 A CN113415163 A CN 113415163A CN 202110874568 A CN202110874568 A CN 202110874568A CN 113415163 A CN113415163 A CN 113415163A
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- 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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- 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
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/61—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
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- 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
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- 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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- 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
Abstract
The application relates to a low-voltage power supply system of a hybrid electric vehicle, a control method and the hybrid electric vehicle, wherein the system comprises a power assembly, a high-voltage unit and a low-voltage unit, wherein the power assembly comprises an engine, an ISG motor, a gearbox and a drive axle; the high-voltage unit comprises a distribution box and a power battery, and the distribution box is connected with the power battery and the ISG motor; the low-voltage unit comprises a whole vehicle DCDC, a whole vehicle low-voltage load and a storage battery, the whole vehicle DCDC is connected with the whole vehicle low-voltage load and the distribution box, and the storage battery is electrically connected with the whole vehicle DCDC and the whole vehicle low-voltage load. The application cancels the original engine accessory generator, generates electricity through the ISG motor, and the generated electric energy is stored in the power battery through the distribution box or is supplied to the low-voltage load of the whole vehicle or charges the storage battery after being converted by the DCDC of the whole vehicle. The low-voltage load power supply system utilizes the energy recovered by braking to supply power to the whole vehicle low-voltage load, is efficient, energy-saving and environment-friendly, simultaneously cancels the original generator, reduces the power consumption of the engine, reduces the weight and the cost, and improves the working efficiency and the economic benefit of the whole vehicle.
Description
Technical Field
The application relates to the technical field of hybrid electric vehicles, in particular to a low-voltage power supply system of a hybrid electric vehicle, a control method and the hybrid electric vehicle.
Background
With the continuous development of new energy technology, the development of new energy automobiles is in a trend, the development of hybrid electric automobiles, electric automobiles and fuel cell automobiles is continuously supported, the core technology of low carbon of the automobiles and the like is mastered, and the development is the target of various manufacturers.
At present, the hybrid technology in the field of commercial vehicles is still in a primary commercialization stage, and no matter a P1 structure (a motor is directly connected with an engine and a clutch is arranged between the motor and a gearbox) or a P2 structure (a clutch is arranged between the motor and the engine and no clutch is arranged between the motor and the gearbox), engine accessories and interfaces of the traditional fuel vehicle are still used, wherein a generator which provides a low-voltage power supply for the whole vehicle is used as one of the engine accessories, and the function, the structure and the interfaces of the generator are consistent with those of the traditional fuel vehicle.
In the related technology, the engine drives the generator to generate electricity through the belt wheel system, and provides electricity demand for the storage battery or the low-voltage load of the whole vehicle, although the technical scheme has simple structure and mature technology, the defects shown in the hybrid vehicle model with increasingly improved electrification degree are obvious: the power generation efficiency is low, and low-voltage electric energy is completely converted through fuel oil, so that the power consumption of engine accessories is increased, and the energy-saving and economical effects are achieved.
Disclosure of Invention
The embodiment of the application provides a low-voltage power supply system and a control method of a hybrid electric vehicle and the hybrid electric vehicle, and aims to solve the problems that in the related art, because an engine is adopted to drive a generator to generate electricity through a belt wheel train, so as to provide electricity demand for a storage battery or a low-voltage load of the whole vehicle, the generating efficiency is low, the power consumption of engine accessories is increased, energy is not saved, and the hybrid electric vehicle is not economical.
In a first aspect, a low voltage power supply system for a hybrid electric vehicle is provided, which includes:
the power assembly comprises an engine, an ISG motor, a gearbox and a drive axle which are mechanically connected in sequence;
the high-voltage unit comprises a power distribution box and a power battery, and the power distribution box is electrically connected with the power battery and the ISG motor;
the low voltage unit, the low voltage unit includes whole car DCDC, whole car low pressure load and battery, whole car DCDC with whole car low pressure load and block terminal electrical connection, the battery with whole car DCDC and whole car low pressure load electrical connection.
The application provides a hybrid vehicle type low pressure power supply system, this scheme is different from traditional fuel vehicle low pressure power supply scheme, and the engine passes through the belt train promptly and drives the generator electricity generation to charge or whole car low pressure load power supply for the battery. According to the scheme, an original engine accessory generator is omitted, and power is generated through an ISG motor by means of a whole vehicle hybrid power system, wherein the power generation comprises braking energy recovery and partial driving power generation. The generated electric energy is stored in a power battery through a distribution box, or is converted into a low-voltage power supply required by the whole vehicle through the whole vehicle DCDC, and the low-voltage power supply is used for supplying power to a low-voltage load of the whole vehicle or charging a storage battery. The energy of this application make full use of braking recovery to satisfy whole car low pressure load power consumption demand, not only high-efficient but also energy-concerving and environment-protective, cancel former generator simultaneously, reduce the engine consumption, also subtract heavy reduce cost, thereby improved the work efficiency and the economic benefits of whole car.
In some embodiments, the vehicle low-voltage load comprises a vehicle controller, a chassis controller, an air conditioner controller, an electronic instrument, a headlamp, a fan and an electromagnetic valve on the chassis; and/or the presence of a gas in the gas,
the gearbox is connected with the drive axle through a transmission shaft.
In a second aspect, a control method of the low-voltage power supply system of the hybrid electric vehicle is provided, which includes the following steps:
judging the working condition type of the hybrid electric vehicle;
when the working condition type is a braking and decelerating working condition, the ISG motor converts mechanical energy transmitted by the drive axle through the gearbox into electric energy, and the electric energy is provided for a low-voltage load of the whole vehicle through the distribution box and the DCDC of the whole vehicle;
when the working condition type is a normal driving working condition, judging whether the electric quantity of the power battery is sufficient, if so, supplying electric energy to the whole vehicle low-voltage load by the power battery through the distribution box and the whole vehicle DCDC; if the electric quantity of the power battery is insufficient, the ISG motor converts part of mechanical energy transmitted by the engine into electric energy, and the electric energy is provided for the low-voltage load of the whole vehicle through the distribution box and the DCDC of the whole vehicle;
when the working condition type is a parking working condition, judging whether the electric quantity of the storage battery is sufficient, and if the electric quantity of the storage battery is sufficient, providing electric energy to the whole vehicle low-voltage load through the storage battery; and if the electric quantity of the storage battery is insufficient, the power battery provides electric energy for the low-voltage load of the whole vehicle through the distribution box and the whole vehicle DCDC.
In some embodiments, when the operating condition type is a braking deceleration operating condition, the ISG motor further charges the power battery after passing through the distribution box, the electric energy being obtained by converting mechanical energy of the drive axle.
In some embodiments, when the operating mode is a braking deceleration operating mode, the ISG motor converts mechanical energy of the drive axle to obtain electric energy, and the electric energy further charges the storage battery after passing through the distribution box and the finished vehicle DCDC.
In some embodiments, when the operating mode type is a normal driving operating mode and the electric quantity of the power battery is sufficient, the power battery further charges the storage battery through the distribution box and the finished vehicle DCDC.
In some embodiments, when the operating condition type is a normal driving operating condition and the electric quantity of the power battery is insufficient, the ISG motor converts the mechanical energy of the engine to obtain electric energy, and the electric energy passes through the distribution box and then charges the power battery.
In some embodiments, when the operating mode is a normal driving operating mode and the electric quantity of the power battery is insufficient, the ISG motor converts the mechanical energy of the engine to obtain electric energy, and the electric energy is used for charging the storage battery after passing through the distribution box and the finished vehicle DCDC.
In some embodiments, when the operating mode type is a parking operating mode and the electric quantity of the storage battery is insufficient, the power battery is charged through the distribution box and the whole vehicle DCDC.
In a third aspect, a hybrid electric vehicle is provided, which adopts the low-voltage power supply system of the hybrid electric vehicle.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the application provides a low-voltage power supply system and a control method of a hybrid electric vehicle and the hybrid electric vehicle, wherein when the low-voltage power supply system is used, low-voltage power supply is carried out according to the working condition type of the hybrid electric vehicle.
When the working condition type is a braking and decelerating working condition, the hybrid electric vehicle is in a braking energy recovery state, mechanical energy transmitted from a drive axle and a gearbox is converted into electric energy through an ISG motor, a part of the electric energy is stored in a power battery through a distribution box, and a part of the electric energy is charged for a storage battery through a finished vehicle DCDC and/or is provided for a finished vehicle low-voltage load, so that the recovered energy is fully utilized.
When the working condition type is a normal driving working condition, the output power of the engine is transmitted to the drive axle through the ISG motor and the gearbox, and the ISG motor only plays a role in transmitting power. When the electric energy of the power battery is sufficient, the power battery supplies electric energy to the low-voltage load of the whole vehicle through the distribution box and the DCDC of the whole vehicle; when the electric energy of the power battery is insufficient, the ISG motor transmits the mechanical energy transmitted by the engine to the gearbox and simultaneously participates in power generation, and the electric energy of the ISG motor supplies power to a low-voltage load of the whole vehicle and/or charges the storage battery through the whole vehicle DCDC through the power distribution box, and part of the electric energy is also used for charging the power battery.
When the working condition type is a parking working condition, if the electric energy of the storage battery is sufficient, the storage battery preferentially supplies power to the low-voltage load of the whole vehicle, and when the electric energy of the storage battery is insufficient, the power battery supplies power to the low-voltage load of the whole vehicle through the distribution box and the DCDC of the whole vehicle and simultaneously supplements and charges the storage battery.
The application provides a hybrid vehicle type low pressure power supply system, this scheme is different from traditional fuel vehicle low pressure power supply scheme, and the engine passes through the belt train promptly and drives the generator electricity generation to charge or whole car low pressure load power supply for the battery. According to the scheme, an original engine accessory generator is omitted, and power is generated through an ISG motor by means of a whole vehicle hybrid power system, wherein the power generation comprises priority of braking energy recovery and auxiliary of partial driving power generation. The generated electric energy is stored in a power battery through a distribution box, or is converted into a low-voltage power supply required by the whole vehicle through the whole vehicle DCDC, and the low-voltage power supply is used for supplying power to a low-voltage load of the whole vehicle or charging a storage battery. The energy of this application make full use of braking recovery to satisfy whole car low pressure load power consumption demand, not only high-efficient but also energy-concerving and environment-protective, cancel former generator simultaneously, reduce the engine consumption, also subtract heavy reduce cost, thereby improved the work efficiency and the economic benefits of whole car.
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 schematic structural diagram of a low-voltage power supply system of a hybrid electric vehicle according to an embodiment of the present application;
FIG. 2 is a schematic power supply diagram of a low-voltage power supply system of a hybrid electric vehicle under a braking and decelerating working condition according to an embodiment of the application;
fig. 3 is a power supply schematic diagram (with sufficient power battery) of a low-voltage power supply system of a hybrid electric vehicle under a normal driving condition according to an embodiment of the present application;
fig. 4 is a power supply schematic diagram (power battery is insufficient) of a low-voltage power supply system of a hybrid electric vehicle under a normal driving condition according to an embodiment of the present application;
fig. 5 is a power supply schematic diagram of a low-voltage power supply system of a hybrid electric vehicle under a parking condition according to an embodiment of the present application.
In the figure: 1. an engine; 2. an ISG motor; 3. a gearbox; 4. a drive axle; 5. a distribution box; 6. a power battery; 7. a whole vehicle DCDC; 8. the low-voltage load of the whole vehicle; 9. a storage battery; 10. a drive shaft.
Detailed Description
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.
The embodiment of the application provides a low-voltage power supply system and a control method of a hybrid electric vehicle and the hybrid electric vehicle, which can solve the problems that the power generation efficiency is low, the power consumption of engine accessories is increased, energy is not saved and the hybrid electric vehicle is not economical because an engine is adopted to drive a generator to generate power through a belt wheel system so as to provide power consumption requirements for a storage battery or a low-voltage load of the whole vehicle.
An ISG motor: refers to an integrated starting/generating integrated motor.
DCDC: refers to a device for converting a dc power supply of a certain voltage class into a dc power supply of another voltage class.
Referring to fig. 1, the low-voltage power supply system of the hybrid electric vehicle provided in the embodiment of the present application includes a power assembly, a high-voltage unit, and a low-voltage unit, where the power assembly includes an engine 1, an ISG motor 2, a transmission 3, and a drive axle 4, which are mechanically connected in sequence; the high-voltage unit comprises a distribution box 5 and a power battery 6, and the distribution box 5 is electrically connected with the power battery 6 and the ISG motor 2; the low-voltage unit comprises a whole vehicle DCDC7, a whole vehicle low-voltage load 8 and a storage battery 9, the whole vehicle DCDC7 is electrically connected with the whole vehicle low-voltage load 8 and the distribution box 5, and the storage battery 9 is electrically connected with the whole vehicle DCDC7 and the whole vehicle low-voltage load 8.
The whole vehicle low-voltage load 8 comprises a whole vehicle controller, a chassis controller, an air conditioner controller, an electronic instrument, a headlamp, a fan and an electromagnetic valve on the chassis.
Referring to fig. 1, the transmission case 3 and the transaxle 4 are connected by a propeller shaft 10.
The low-voltage power supply system for the hybrid electric vehicle provided by the embodiment supplies power at low voltage according to the working condition type of the hybrid electric vehicle when in use.
Specifically, the types of operating conditions of the hybrid vehicle include a braking deceleration operating condition, a normal running operating condition, and a parking operating condition. The braking deceleration comprises braking deceleration on a downhill and normal braking, and the parking comprises temporary parking and long-time parking.
Referring to fig. 2, when the operating mode is a braking deceleration operating mode, the hybrid electric vehicle is in a braking energy recovery state, mechanical energy transmitted from the drive axle 4, the transmission shaft 10 and the gearbox 3 is converted into electric energy through the ISG motor 2, a part of the electric energy is stored in the power battery 6 through the distribution box 5, and a part of the electric energy is used for charging the storage battery 9 through the whole vehicle DCDC7 and/or is provided for the whole vehicle low-voltage load 8, so that the recovered energy is fully utilized.
Referring to fig. 3 and 4, when the operating mode is a normal driving operating mode, the engine 1 outputs power to the drive axle 4 through the ISG motor 2, the gearbox 3 and the transmission shaft 10, and the ISG motor 2 only plays a role in transmitting power. When the electric energy of the power battery 6 is sufficient, the power battery 6 supplies the electric energy to the low-voltage load 8 of the whole vehicle through the distribution box 5 and the DCDC7 of the whole vehicle, and the energy flows to the state shown in FIG. 3; when the power battery 6 is insufficient in electric energy, the ISG motor 2 transmits the mechanical energy transmitted by the engine 1 to the gearbox 3 and simultaneously participates in power generation, the electric energy of the ISG motor passes through the distribution box 5, and not only is the power supplied to the low-voltage load 8 of the whole vehicle and/or the storage battery 9 charged through the DCDC7 of the whole vehicle, but also a part of the electric energy is used for charging the power battery 6, and the energy flow direction of the electric energy is shown in fig. 4.
Referring to fig. 5, when the type of the operating mode is a parking operating mode, if the electric energy of the storage battery 9 is sufficient, the storage battery 9 preferentially supplies power to the low-voltage load 8 of the whole vehicle, and when the electric energy of the storage battery 9 is insufficient, the power battery 6 supplies power to the low-voltage load 8 of the whole vehicle through the distribution box 5 and the DCDC7 of the whole vehicle, and meanwhile, the storage battery 9 is charged in a supplementary mode, and the energy flow direction is as shown in fig. 4.
The application provides a hybrid vehicle type low pressure power supply system, this scheme is different from traditional fuel vehicle low pressure power supply scheme, and the engine passes through the belt train promptly and drives the generator electricity generation to charge or whole car low pressure load power supply for the battery. According to the scheme, an original engine accessory generator is omitted, and power is generated through an ISG motor by means of a whole vehicle hybrid power system, wherein the power generation comprises priority of braking energy recovery and auxiliary of partial driving power generation. The generated electric energy is stored in a power battery through a distribution box, or is converted into a low-voltage power supply required by the whole vehicle through the whole vehicle DCDC, and the low-voltage power supply is used for supplying power to a low-voltage load of the whole vehicle or charging a storage battery. The energy of this application make full use of braking recovery to satisfy whole car low pressure load power consumption demand, not only high-efficient but also energy-concerving and environment-protective, cancel former generator simultaneously, reduce the engine consumption, also subtract heavy reduce cost, thereby improved the work efficiency and the economic benefits of whole car.
Referring to fig. 2, 3, 4 and 5, in some preferred embodiments, the present application further provides a control method of a low voltage power supply system of a hybrid vehicle, which includes the following steps:
101: judging the working condition type of the hybrid electric vehicle, wherein the working condition type comprises a braking and decelerating working condition, a normal driving working condition and a parking working condition, executing a judging process through an ECU (electronic control Unit), a VCU (video control unit) or an MCU (microprogrammed control Unit), and sending a corresponding control instruction to the power battery 6, the ISG (integrated starter generator) motor 2 or the storage battery 9 so as to enable related components to execute the control instruction;
102: when the working condition type is a braking and decelerating working condition, the ISG motor 2 converts mechanical energy transmitted by the drive axle 4 through the gearbox 3 into electric energy, and the electric energy is provided for the low-voltage load 8 of the whole vehicle through the distribution box 5 and the DCDC7 of the whole vehicle, so that the energy recovered by braking is fully utilized to meet the power demand of the low-voltage load 8 of the whole vehicle, and the electric energy-saving braking system is efficient, energy-saving and environment-friendly;
when the working condition type is a normal driving working condition, judging whether the electric quantity of the power battery 6 is sufficient, if the electric quantity of the power battery 6 is sufficient, the power battery 6 supplies electric energy to a low-voltage load 8 of the whole vehicle through the distribution box 5 and the DCDC7 of the whole vehicle; if the electric quantity of the power battery 6 is insufficient, the ISG motor 2 converts part of the mechanical energy transmitted by the engine 1 into electric energy, and supplies the electric energy to the low-voltage load 8 of the whole vehicle through the distribution box 5 and the DCDC7 of the whole vehicle;
when the working condition type is a parking working condition, judging whether the electric quantity of the storage battery 9 is sufficient, and if the electric quantity of the storage battery 9 is sufficient, supplying electric energy to the whole vehicle low-voltage load 8 through the storage battery 9; if the electric quantity of the storage battery 9 is insufficient, the power battery 6 supplies electric energy to the low-voltage load 8 of the whole vehicle through the distribution box 5 and the DCDC7 of the whole vehicle.
Referring to fig. 2, in some preferred embodiments, when the operating mode is a braking deceleration operating mode, if the electric energy of the power battery 6 is not full, the ISG motor 2 converts the mechanical energy of the transaxle 4 into electric energy, and then the electric energy passes through the distribution box 5 to charge the power battery 6, so as to further fully utilize the energy recovered by braking and improve the power supply capacity of the power battery 6.
Referring to fig. 2, in some preferred embodiments, when the operating mode is a braking deceleration operating mode, if the electric energy of the storage battery 9 is not full, the ISG motor 2 converts the mechanical energy of the transaxle 4 into electric energy, and the electric energy passes through the distribution box 5 and the vehicle DCDC7, and then charges the storage battery 9, so as to further fully utilize the energy recovered by braking, and improve the power supply capability of the storage battery 9.
Referring to fig. 3, in some preferred embodiments, when the operating condition type is a normal driving operating condition and the power battery 6 is sufficiently charged, if the power of the storage battery 9 is not full, the power battery 6 also charges the storage battery 9 through the distribution box 5 and the whole vehicle DCDC7, so as to preferably supply power to the whole vehicle low-voltage load 8 through the storage battery 9 when the vehicle is parked.
Referring to fig. 4, in some preferred embodiments, when the operating condition type is a normal driving operating condition and the electric quantity of the power battery 6 is insufficient, the ISG motor 2 converts the mechanical energy of the engine 1 into electric energy, and then charges the power battery 6 after passing through the distribution box 5.
Referring to fig. 4, in some preferred embodiments, when the operating condition type is a normal driving operating condition and the power battery 6 is insufficient in power, the ISG motor 2 converts the mechanical energy of the engine 1 into electric energy, and the electric energy is used for charging the storage battery 9 after passing through the distribution box 5 and the vehicle DCDC 7.
Referring to fig. 5, in some preferred embodiments, when the type of the operating condition is a parking condition and the battery 9 is not sufficiently charged, the power battery 6 also charges the battery 9 through the distribution box 5 and the entire vehicle DCDC 7.
The embodiment of the application also provides a hybrid electric vehicle, and the hybrid electric vehicle adopts the low-voltage power supply system of the hybrid electric vehicle provided by any one of the above embodiments.
Specifically, referring to fig. 1, the low-voltage power supply system of the hybrid electric vehicle includes a power assembly, a high-voltage unit and a low-voltage unit, wherein the power assembly includes an engine 1, an ISG motor 2, a transmission 3 and a drive axle 4 which are mechanically connected in sequence; the high-voltage unit comprises a distribution box 5 and a power battery 6, and the distribution box 5 is electrically connected with the power battery 6 and the ISG motor 2; the low-voltage unit comprises a whole vehicle DCDC7, a whole vehicle low-voltage load 8 and a storage battery 9, the whole vehicle DCDC7 is electrically connected with the whole vehicle low-voltage load 8 and the distribution box 5, and the storage battery 9 is electrically connected with the whole vehicle DCDC7 and the whole vehicle low-voltage load 8. The whole vehicle low-voltage load 8 comprises a whole vehicle controller, a chassis controller, an air conditioner controller, an electronic instrument, a headlamp, a fan and an electromagnetic valve on the chassis.
Referring to fig. 1, the transmission case 3 and the transaxle 4 are connected by a propeller shaft 10.
In this embodiment, the hybrid vehicle type low-voltage power supply system is different from a traditional fuel vehicle low-voltage power supply scheme, namely, an engine drives a generator to generate power through a belt wheel train so as to charge a storage battery or supply power to a low-voltage load of the whole vehicle. Meanwhile, the electric energy generated by the electricity generation of the ISG motor is stored in a power battery through a distribution box, or is converted into a low-voltage power supply required by the whole vehicle through the whole vehicle DCDC and is used for supplying power to the low-voltage load of the whole vehicle or charging a storage battery. Therefore, the hybrid electric vehicle provided by the embodiment can cancel the original generator after using the set of low-voltage power supply system of the hybrid electric vehicle, so as to reduce weight and cost, and reduce power consumption of the engine, and meanwhile, can utilize energy recovered by braking so as to meet the power demand of low-voltage load of the whole vehicle, so that the hybrid electric vehicle has higher working efficiency and economic benefit, and the competitiveness of the hybrid electric vehicle in the market is enhanced.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
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 above description is merely exemplary of the present application and is 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 (10)
1. A low-voltage power supply system of a hybrid electric vehicle is characterized by comprising:
the power assembly comprises an engine (1), an ISG motor (2), a gearbox (3) and a drive axle (4) which are mechanically connected in sequence;
a high voltage unit comprising a distribution box (5) and a power battery (6), the distribution box (5) being electrically connected with the power battery (6) and the ISG motor (2);
the low voltage unit, the low voltage unit includes whole car DCDC (7), whole car low pressure load (8) and battery (9), whole car DCDC (7) with whole car low pressure load (8) and block terminal (5) electrical connection, battery (9) with whole car DCDC (7) and whole car low pressure load (8) electrical connection.
2. The low-voltage power supply system for hybrid electric vehicle according to claim 1, characterized in that:
the whole vehicle low-voltage load (8) comprises a whole vehicle controller, a chassis controller, an air conditioner controller, an electronic instrument, a headlamp, a fan and an electromagnetic valve on the chassis; and/or the presence of a gas in the gas,
the gearbox (3) is connected with the drive axle (4) through a transmission shaft (10).
3. A control method of a low-voltage power supply system of a hybrid vehicle according to claim 1 or 2, characterized in that it comprises the following steps:
judging the working condition type of the hybrid electric vehicle;
when the working condition type is a braking and decelerating working condition, the ISG motor (2) converts mechanical energy transmitted by the drive axle (4) through the gearbox (3) into electric energy, and the electric energy is provided for a low-voltage load (8) of the whole vehicle through the distribution box (5) and the DCDC (7) of the whole vehicle;
when the working condition type is a normal driving working condition, judging whether the electric quantity of the power battery (6) is sufficient, if so, providing electric energy for a whole vehicle low-voltage load (8) by the power battery (6) through the distribution box (5) and the whole vehicle DCDC (7); if the electric quantity of the power battery (6) is insufficient, the ISG motor (2) converts part of the mechanical energy transmitted by the engine (1) into electric energy, and the electric energy is provided for a low-voltage load (8) of the whole vehicle through the distribution box (5) and the DCDC (7) of the whole vehicle;
when the working condition type is a parking working condition, judging whether the electric quantity of the storage battery (9) is sufficient, and if the electric quantity of the storage battery (9) is sufficient, providing electric energy to a low-voltage load (8) of the whole vehicle through the storage battery (9); if the electric quantity of the storage battery (9) is not sufficient, the power battery (6) provides electric energy for a whole vehicle low-voltage load (8) through the distribution box (5) and the whole vehicle DCDC (7).
4. The low-voltage power supply system for hybrid vehicles according to claim 3, characterized in that: when the working condition type is a braking and decelerating working condition, the ISG motor (2) converts the mechanical energy of the drive axle (4) to obtain electric energy, and the electric energy is used for charging the power battery (6) after passing through the distribution box (5).
5. The low-voltage power supply system for hybrid vehicles according to claim 3, characterized in that: when the working condition type is a braking and decelerating working condition, the ISG motor (2) converts the mechanical energy of the drive axle (4) into electric energy, and the electric energy is used for charging the storage battery (9) after passing through the distribution box (5) and the whole vehicle DCDC (7).
6. The low-voltage power supply system for hybrid vehicles according to claim 3, characterized in that: when the working condition type is a normal driving working condition, and the electric quantity of the power battery (6) is sufficient, the power battery (6) is charged by the storage battery (9) through the distribution box (5) and the whole vehicle DCDC (7).
7. The low-voltage power supply system for hybrid vehicles according to claim 3, characterized in that: when the working condition type is a normal running working condition and the electric quantity of the power battery (6) is insufficient, the ISG motor (2) converts the mechanical energy of the engine (1) to obtain electric energy, and the electric energy is used for charging the power battery (6) after passing through the distribution box (5).
8. The low-voltage power supply system for hybrid vehicles according to claim 3, characterized in that: and when the working condition type is a normal running working condition and the electric quantity of the power battery (6) is insufficient, the ISG motor (2) converts the mechanical energy of the engine (1) to obtain electric energy, and the electric energy is used for charging the storage battery (9) after passing through the distribution box (5) and the whole vehicle DCDC (7).
9. The low-voltage power supply system for hybrid vehicles according to claim 3, characterized in that: when the working condition type is a parking working condition and the electric quantity of the storage battery (9) is not sufficient, the power battery (6) is charged in the storage battery (9) through the distribution box (5) and the whole vehicle DCDC (7).
10. A hybrid vehicle, characterized in that: which adopts the low-voltage power supply system of the hybrid electric vehicle as claimed in claim 1 or 2.
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