CN113635783A - Vehicle combined power electric transmission system and method - Google Patents

Vehicle combined power electric transmission system and method Download PDF

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Publication number
CN113635783A
CN113635783A CN202111131405.5A CN202111131405A CN113635783A CN 113635783 A CN113635783 A CN 113635783A CN 202111131405 A CN202111131405 A CN 202111131405A CN 113635783 A CN113635783 A CN 113635783A
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CN
China
Prior art keywords
preset
alternating current
battery pack
vehicle
power battery
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Pending
Application number
CN202111131405.5A
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Chinese (zh)
Inventor
张维建
赵涛
王兴刚
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Sany Heavy Equipment Co Ltd
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Sany Heavy Equipment Co Ltd
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Priority to CN202111131405.5A priority Critical patent/CN113635783A/en
Publication of CN113635783A publication Critical patent/CN113635783A/en
Pending legal-status Critical Current

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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
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/13—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines using AC generators and AC 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
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/10—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines
    • B60L50/15—Electric propulsion with power supplied within the vehicle using propulsion power supplied by engine-driven generators, e.g. generators driven by combustion engines with additional electric power supply
    • 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
    • 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
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • B60L7/14—Dynamic electric regenerative braking for vehicles propelled by ac 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
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • B60L7/16—Dynamic electric regenerative braking for vehicles comprising converters between the power source and the motor
    • 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
    • B60L2200/00—Type of vehicles
    • B60L2200/36—Vehicles designed to transport cargo, e.g. trucks
    • 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
    • B60L2210/40—DC to AC converters
    • B60L2210/44—Current source inverters
    • 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
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors

Abstract

The application discloses a vehicle combined power electric transmission system and a method, wherein the system comprises: the system comprises an engine, a main generator, a traction converter, a power battery pack and an electric wheel combination; wherein, the engine is used for doing main generator output mechanical energy is in order to drive main generator rotates, main generator be used for with mechanical energy turns into first alternating current, and to the traction converter provides first alternating current, power battery group be used for when satisfying preset vehicle load threshold value and preset battery power threshold value, to the traction converter provides the second direct current to charge when the vehicle brakes, the traction converter be used for with first alternating current turns into first direct current, and with first direct current and/or the second direct current turns into the second alternating current, and to the electric wheel combination provides the second alternating current, the electric wheel combination is used for driving the vehicle under the effect of second alternating current and traveles.

Description

Vehicle combined power electric transmission system and method
Technical Field
The application relates to the technical field of vehicle transmission, in particular to a vehicle combined power electric transmission system and a vehicle combined power electric transmission method.
Background
The prior off-highway rigid mining dump truck mainly has two power transmission modes, one is mechanical transmission and the other is electric transmission. The electric drive mining dump truck is mainly used in large-tonnage mining dump trucks due to the technical superiority.
In the prior art, the electric drive mining dump truck mainly provides driving force for a vehicle through the whole-process output of an engine, on one hand, the engine of the electric drive mining dump truck in the form is low in working efficiency, and on the other hand, electric energy generated when the electric drive dump truck brakes is completely wasted. Therefore, how to reduce the electric energy waste generated when the electric drive mining dump truck brakes while improving the working efficiency of the engine of the electric drive mining dump truck becomes a technical problem to be solved urgently in the field.
Disclosure of Invention
In view of this, the present application provides a vehicle combined power electric transmission system and method, in which a power battery pack is configured to be charged when a vehicle is braked, and if a preset vehicle load threshold and a preset battery power threshold are met during vehicle traction, auxiliary power can be provided to the vehicle, so that an engine can keep the working efficiency at the highest, and the waste of electric energy generated during vehicle braking is reduced while the working efficiency of the vehicle engine is improved.
According to one aspect of the present application, there is provided a vehicle combined power electric drive system comprising:
the system comprises an engine, a main generator, a traction converter, a power battery pack and an electric wheel combination;
wherein, the engine with the main generator mechanical connection, the engine be used for main generator output mechanical energy is in order to drive the main generator rotates, the main generator with traction converter cable junction, the main generator be used for with mechanical energy turns into first alternating current, and provide first alternating current to traction converter, power battery group with traction converter cable junction, power battery group be used for when satisfying preset vehicle load threshold and preset battery power threshold, to provide second direct current to traction converter, and charge when the vehicle brakes, traction converter with electronic round of combination cable connection, traction converter be used for with first alternating current turns into first direct current, and with first direct current and/or the second direct current turns into second alternating current, and supplying the second alternating current to the electric wheel combination, wherein the electric wheel combination is used for driving the vehicle to run under the action of the second alternating current.
Optionally, the engine, the main generator and the electric wheel assemblies respectively comprise two, wherein each engine is mechanically connected to one main generator, and the two electric wheel assemblies are respectively connected to the traction converter cable.
Optionally, the traction converter specifically includes:
the system comprises two rectifying modules, two inverting modules and a voltage transformer;
each rectification module is connected with one main generator cable and is used for converting the first alternating current provided by the main generator into a first direct current;
each inverter module is connected with one rectifier module and one electric wheel combination cable, and is used for converting the first direct current and/or the second direct current into second alternating current and providing the second alternating current for the electric wheel combination;
the voltage transformer is connected with the power battery pack, the rectifying module and the inversion module through cables, and is used for boosting the second direct current provided by the power battery pack and providing the boosted second direct current to the inversion module.
Optionally, the electric wheel combination comprises a traction motor and a speed reducer combination;
the traction motor is connected with the inverter module through a cable, and is used for converting the second alternating current into mechanical energy and driving the reducer assembly through the mechanical energy;
the speed reducer combination is mechanically connected with the traction motor and comprises a speed reducer and a tire, and the speed reducer combination is used for acting the mechanical energy on the tire according to a preset speed reduction ratio so as to drive the tire to rotate.
Optionally, the traction converter further comprises a chopping module;
the chopping module is connected with the rectifying module and the inverting module through cables, and is used for enabling the braking current in the traction converter to act on a braking resistor based on the residual electric quantity of the power battery pack when the vehicle is in a braking state;
the brake resistor is connected with the chopping module through a cable, and the brake resistor is used for consuming brake current provided by the chopping module.
Optionally, the engine is further configured to, when the vehicle is in a braking state, provide mechanical energy to the main generator when a real vehicle load value corresponding to the vehicle is smaller than a preset vehicle load threshold, a remaining power amount corresponding to the power battery pack is smaller than a preset battery charging threshold, and a voltage value corresponding to the traction converter is smaller than a preset chopping threshold;
the main generator is also used for converting the mechanical energy into first charging alternating current;
the rectifying module is also used for converting the first charging alternating current into a first charging direct current;
the voltage transformer is also used for reducing the first charging direct current and providing the reduced first charging direct current to the power battery pack so as to charge the power battery pack;
the electric wheel combination is also used for generating a second charging alternating current when the vehicle is in a braking state;
the inversion module is further used for converting the second charging alternating current into a second charging direct current, and providing the second charging direct current to the power battery pack and/or the chopping module based on the residual electric quantity of the power battery pack and the preset battery charging threshold;
the engine is also used for providing mechanical energy for the main generator based on the residual capacity of the power battery pack when the vehicle is in a parking state.
According to another aspect of the present application, there is provided a vehicle combined power electric transmission method including:
receiving a vehicle starting signal, determining a target power source from preset power sources based on a preset vehicle load threshold and a preset battery electric quantity threshold, and providing current for a traction converter through the target power source, wherein the preset power sources comprise an engine, a main generator and a power battery pack;
converting the current provided by the target power source into a second alternating current according to the traction converter, and providing the second alternating current to an electric wheel combination;
and converting the second alternating current into mechanical energy through the electric wheel combination so as to drive the vehicle to run.
Optionally, the engine, the main generator and the electric wheel combination respectively comprise two; the method comprises the following steps of determining a target power source from preset power sources based on a preset vehicle load threshold and a preset battery power threshold, and specifically comprises the following steps:
when the actual vehicle load value is smaller than a preset vehicle load threshold value and the corresponding residual electric quantity of the power battery pack is larger than a preset battery electric quantity threshold value, taking one of the engine, one of the main generators and the power battery pack as the target power source;
when the actual vehicle load value is smaller than a preset vehicle load threshold value and the corresponding residual electric quantity of the power battery pack is smaller than a preset battery electric quantity threshold value, taking one of the engines and one of the main generators as the target power sources;
when the actual load value of the vehicle is larger than a preset load threshold value of the vehicle and the corresponding residual electric quantity of the power battery pack is larger than a preset battery electric quantity threshold value, taking the two engines, the two main generators and the power battery pack as the target power sources;
and when the actual load value of the vehicle is greater than a preset load threshold value of the vehicle and the corresponding residual electric quantity of the power battery pack is less than a preset battery electric quantity threshold value, taking the two engines and the two main generators as the target power sources.
Optionally, the traction converter comprises two rectifying modules, two inverting modules and a voltage transformer; the converting the current provided by the target power source into a second alternating current according to the traction converter specifically comprises:
when the target power source comprises an engine, a main generator and a power battery pack, converting first alternating current provided by the main generator into first direct current through the rectification module, boosting second direct current provided by the power battery pack through the voltage transformer, and converting the first direct current and the boosted second direct current into second alternating current through the inversion module;
when the target power source comprises an engine and a main generator, the first alternating current provided by the main generator is converted into a first direct current through the rectifying module, and the first direct current is converted into a second alternating current through the inverting module.
Optionally, the method further comprises:
receiving a vehicle braking signal, and judging the relation between the real vehicle load value and the preset vehicle load threshold value and the relation between the residual electric quantity corresponding to the power battery pack and the preset battery charging threshold value;
when the real vehicle load value is smaller than the preset vehicle load threshold value and the residual electric quantity corresponding to the power battery pack is smaller than a preset battery charging threshold value, judging the relation between the voltage value in the traction converter and the preset chopping threshold value, and when the voltage value in the traction converter is smaller than the preset chopping threshold value, combining the engine, the main generator and the electric wheel into the power battery pack for charging;
when the residual electric quantity corresponding to the power battery pack is larger than the preset battery charging threshold value, second charging alternating current generated by the electric wheel combination is provided to the chopping module, and the second charging alternating current is consumed through a brake resistor;
when the residual electric quantity corresponding to the power battery pack is smaller than the preset battery charging threshold value and the voltage value in the traction converter is larger than the preset chopping threshold value, the second charging alternating current generated by the electric wheel combination is supplied to the voltage transformer for voltage reduction, the power battery pack is charged through the second charging alternating current after voltage reduction, and the second charging alternating current generated by the electric wheel combination is supplied to the chopping module after charging is finished, and the second charging alternating current is consumed through the brake resistor.
The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
FIG. 1 is a schematic diagram illustrating a combined powertrain system of a vehicle according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating an alternate combined powertrain-electric powertrain of the vehicle provided by an embodiment of the present application;
FIG. 3 is a flow chart illustrating a method for combining a power electric transmission of a vehicle according to an embodiment of the present application.
Detailed Description
The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
In the present embodiment, there is provided a vehicle combined power-electric transmission system, as shown in fig. 1, comprising:
the system comprises an engine, a main generator, a traction converter, a power battery pack and an electric wheel combination; wherein, the engine with the main generator mechanical connection, the engine be used for main generator output mechanical energy is in order to drive the main generator rotates, the main generator with traction converter cable junction, the main generator be used for with mechanical energy turns into first alternating current, and provide first alternating current to traction converter, power battery group with traction converter cable junction, power battery group be used for when satisfying preset vehicle load threshold and preset battery power threshold, to provide second direct current to traction converter, and charge when the vehicle brakes, traction converter with electronic round of combination cable connection, traction converter be used for with first alternating current turns into first direct current, and with first direct current and/or the second direct current turns into second alternating current, and supplying the second alternating current to the electric wheel combination, wherein the electric wheel combination is used for driving the vehicle to run under the action of the second alternating current.
The vehicle combined power electric transmission system can be applied to off-highway rigid mining dump trucks and other vehicles, and is not required here. The vehicle combined power electric transmission system mainly comprises an engine, a main generator, a traction converter, a power battery pack and an electric wheel combination. The engine and the main generator in the vehicle combined power electric transmission system are connected in a mechanical connection mode, so that the engine can start to rotate after receiving a vehicle starting signal, electric energy is converted into mechanical energy, the mechanical energy is output to the main generator, and the main generator is driven to rotate. The main generator, when rotated, may again generate a first alternating current and supply the first alternating current to a traction converter which is connected to its cable. In addition, besides the main generator can provide power for the vehicle, when the power battery pack meets a preset vehicle load threshold and a preset battery electric quantity threshold, the power battery pack can also provide certain power for the vehicle. For example, when the load of the mining dump truck is smaller than the preset vehicle load threshold value and the remaining capacity of the power battery pack is larger than the preset battery capacity threshold value, the power battery pack can be used as the auxiliary power output of the mining dump truck, and the power battery pack can be specifically connected with the traction converter in a cable mode, so that the power battery pack can provide the output second direct current to the traction converter. The traction converter can be connected with the electric wheel combination in a cable mode, the traction converter can convert first alternating current of the main generator into first direct current, and can convert second direct current provided by the first direct current and/or the power battery pack into second alternating current and provide the second alternating current for the electric wheel combination, so that the electric wheel combination can drive a vehicle to run under the action of the second alternating current. Besides, the power battery pack can provide certain auxiliary power for the running of the vehicle, and can store electric energy generated during the braking of the vehicle.
By applying the technical scheme of the embodiment, the vehicle combined power electric transmission system comprises an engine, a main generator, a traction converter, a power battery pack and an electric wheel combination. The engine can output mechanical energy for the main generator, the main generator can convert the mechanical energy into first alternating current and provide the first alternating current for the traction converter, the power battery pack can provide auxiliary power for the vehicle under the condition that a preset vehicle load threshold value and a preset battery charge threshold value are met, the power battery pack can be used for charging when the vehicle brakes, the traction converter can convert the first alternating current of the main generator into first direct current, and can convert the first direct current and/or second direct current provided by the power battery pack into second alternating current and provide the second alternating current for the electric wheel combination so as to drive the vehicle to run through the electric wheel combination. This application charges when the vehicle braking through setting up the power battery group to if satisfy when the vehicle pulls predetermine vehicle load threshold value and predetermine the battery power threshold value and can provide auxiliary power to the vehicle, make the engine can keep work efficiency at the highest, when promoting vehicle engine work efficiency, the electric energy waste that produces when reducing the vehicle braking.
In the above embodiment of the present application, optionally, the engine, the main generator and the electric wheel assemblies respectively include two, wherein each of the engine is mechanically connected to one of the main generators, and the two electric wheel assemblies are respectively connected to the traction converter cable.
In this embodiment, each vehicle combined power electric transmission system may include two engines, two main generators and two electric wheel combinations, each engine is connected with one main generator, for example, two engines are engine a and engine B, the main generators are main generator 1 and main generator 2, respectively, then engine a may be mechanically connected with main generator 1, engine B may be mechanically connected with main generator 2, and then main generator 1 and main generator 2 are respectively connected with a traction converter cable. The two electric wheel combinations are also respectively connected with a traction converter cable. The two engines and the two main generators are arranged, so that the driving of a vehicle is not influenced when one of the engines and the main generators are in failure, and the usability of the vehicle is improved.
In the above embodiment of the present application, optionally, the traction converter specifically includes: the system comprises two rectifying modules, two inverting modules and a voltage transformer; each rectification module is connected with one main generator cable and is used for converting the first alternating current provided by the main generator into a first direct current; each inverter module is connected with one rectifier module and one electric wheel combination cable, and is used for converting the first direct current and/or the second direct current into second alternating current and providing the second alternating current for the electric wheel combination; the voltage transformer is connected with the power battery pack, the rectifying module and the inversion module through cables, and is used for boosting the second direct current provided by the power battery pack and providing the boosted second direct current to the inversion module.
In this embodiment, the traction converter may be composed of two rectifying modules, two inverting modules and one voltage transformer. The two rectifying modules can be respectively connected with the two main generators in a one-to-one correspondence mode through cables, and the rectifying modules can convert first alternating current provided by the main generators into first direct current. The two inversion modules can be respectively connected with the two rectification modules through cables one by one, and can also be connected with the electric wheels through cables one by one. After the inversion module is connected with the rectification module, the first direct current output by the rectification module can be converted into second alternating current, and in addition, the second direct current provided by the power battery pack can be converted into second alternating current which is then provided for the electric wheel combination. The traction converter can also comprise a voltage transformer, the voltage transformer can be connected with a power battery pack cable or connected with two rectifying modules and two inversion modules in the traction converter by cables, the voltage transformer can boost the second direct current provided by the power battery pack firstly, and the boosted second direct current is provided for the inversion modules after the second direct current is boosted to a preset voltage value.
In the above embodiments of the present application, optionally, the electric wheel combination includes a traction motor and a speed reducer combination; the traction motor is connected with the inverter module through a cable, and is used for converting the second alternating current into mechanical energy and driving the reducer assembly through the mechanical energy; the speed reducer combination is mechanically connected with the traction motor and comprises a speed reducer and a tire, and the speed reducer combination is used for acting the mechanical energy on the tire according to a preset speed reduction ratio so as to drive the tire to rotate.
In this embodiment, the electric wheel combination in the combined power-electric transmission system of the vehicle may be constituted by a traction motor and reducer combination. The traction motor in each electric wheel combination can be connected with one inversion module in the traction converter due to the fact that the two electric wheel combinations are arranged. The traction motor can convert the second alternating current of the inverter module into mechanical energy to be output, and then the mechanical energy drives the reducer combination. The speed reducer combination can be mechanically connected with the traction motor, wherein the speed reducer combination can comprise a speed reducer and a tire. The speed reducer combination can rotate under the driving of the traction motor, and can reduce the speed according to a preset speed reduction ratio, and the speed reduced speed acts on the tire to drive the tire to rotate, so that the vehicle is driven to run.
In the above embodiments of the present application, optionally, the traction converter further includes a chopper module; the chopping module is connected with the rectifying module and the inverting module through cables, and is used for enabling the braking current in the traction converter to act on a braking resistor based on the residual electric quantity of the power battery pack when the vehicle is in a braking state; the brake resistor is connected with the chopping module through a cable, and the brake resistor is used for consuming brake current provided by the chopping module.
In this embodiment, the traction converter may further comprise a chopping module. The chopper module can be connected to two rectifier modules and two inverter modules in the traction converter by means of cables. The chopper module may function when the vehicle is in a braking state. For example, when the remaining capacity of the power battery pack is large and charging is not required, the chopper module may apply the electric energy generated when the vehicle is braked to the brake resistor, so that the brake resistor connected to the chopper module via a cable consumes the electric energy. When the residual electric quantity of the power battery is not much needed to be charged, the chopper module can also apply the residual electric energy of the power battery pack to the brake resistor.
In the above embodiment of the present application, optionally, the engine is further configured to, when the vehicle is in a braking state, provide mechanical energy to the main generator when a real vehicle load value corresponding to the vehicle is smaller than a preset vehicle load threshold value, a remaining power amount corresponding to the power battery pack is smaller than a preset battery charging threshold value, and a voltage value corresponding to the traction converter is smaller than a preset chopping threshold value; the main generator is also used for converting the mechanical energy into first charging alternating current; the rectifying module is also used for converting the first charging alternating current into a first charging direct current; the voltage transformer is also used for reducing the first charging direct current and providing the reduced first charging direct current to the power battery pack so as to charge the power battery pack; the electric wheel combination is also used for generating a second charging alternating current when the vehicle is in a braking state; the inversion module is further used for converting the second charging alternating current into a second charging direct current, and providing the second charging direct current to the power battery pack and/or the chopping module based on the residual electric quantity of the power battery pack and the preset battery charging threshold; the engine is also used for providing mechanical energy for the main generator based on the residual capacity of the power battery pack when the vehicle is in a parking state.
In this embodiment, when the vehicle is in a braking state, if the actual vehicle load value corresponding to the vehicle is smaller than the preset vehicle load threshold value, and the remaining power corresponding to the power battery pack is smaller than the preset battery charging threshold value, and the voltage value in the traction converter is smaller than the preset chopping threshold value, the mechanical energy of the engine rotating during the idling is provided to the main generator. For example, when the real value of the vehicle load is smaller than the preset vehicle load threshold value and the remaining capacity of the power battery pack is smaller than the preset battery charging threshold value, it indicates that the power battery pack needs to be charged, and at this time, if the voltage value in the traction converter is smaller than the preset chopping threshold value, the electric energy for charging the power battery pack is provided by the engine, in addition to the braking current of the electric wheel combination, the engine can also drive the main generator to provide mechanical energy for the main generator, and then the main generator converts the mechanical energy into the first charging alternating current. A rectifying module in the traction converter is connected with a main generator, the rectifying module can convert first charging alternating current into first charging direct current, then a voltage transformer connected with the rectifying module reduces the voltage of the first charging direct current, and the first charging direct current is supplied to a power battery pack after being reduced, so that the power battery pack is charged. In addition to the engine and the main generator providing electric energy for the power battery pack, the electric wheel assembly can also generate a second charging alternating current when the vehicle is in a braking state, then the inverter module connected with the electric wheel assembly cable can convert the second charging alternating current into a second charging direct current, and then the second charging direct current can be provided to the power battery pack and/or the chopper module based on a preset vehicle load threshold and the residual electric quantity of the power battery pack. For example, when the remaining capacity of the power battery pack is less than the preset battery charging threshold, which indicates that the power battery pack needs to be charged, at this time, a part of the second charging direct current may be used for charging the power battery pack, and a part of the second charging direct current acts on the braking resistor through the chopper module and is consumed through the braking resistor. When the residual electric quantity of the power battery pack is larger than the preset battery charging threshold value, the power battery pack does not need to be charged, and at the moment, the second charging direct current can be completely acted on the brake resistor through the chopper module and is consumed through the brake resistor. When a part of the second charging direct current is used for charging the power battery pack, the voltage can be reduced through the voltage transformer, and then the power battery pack is charged. When the vehicle is in a parking state, if the residual electric quantity in the power battery pack is not in a full-charge state, one of the two engines can be selected to charge the power battery pack on the basis of the residual electric quantity in the power battery pack. Specifically, one of the engines can provide mechanical energy for the main generator, the main generator converts the mechanical energy into first charging alternating current, the rectifying module converts the first charging alternating current into first charging direct current, then the voltage transformer reduces the first charging direct current, and provides the reduced first charging direct current to the power battery pack, so that charging of the power battery pack is achieved.
In addition, when one of two engines and one power battery pack in the preset power source is in a failure state, the target power source of the vehicle can be adjusted according to actual conditions. For example, the two engines are the engine 1 and the engine 2 respectively, when the engine 1 or the engine 2 or the power battery pack has a fault, the fault power source can be cut off, the power supply can be continued without the fault, the work of the vehicle is not influenced, and the usability of the vehicle is improved.
Further, as an embodiment of the present application, as shown in fig. 2, the vehicle combined power electric transmission system of the present application mainly includes two engines, two main generators, a traction converter, a power battery set, a brake resistor, and two electric wheel combinations. The traction converter can comprise two rectifying modules, two inverter modules, a chopper module and a DC/DC transformer (voltage transformer), and the electric wheel combination can comprise a traction motor and a reducer combination. The engine and the main generator in the vehicle combined power electric transmission system are connected in a mechanical connection mode, so that the engine can start to rotate after receiving a vehicle starting signal, electric energy is converted into mechanical energy, the mechanical energy is output to the main generator, and the main generator is driven to rotate. The main generator can generate first alternating current after rotating, the first alternating current is supplied to a rectifying module connected with a cable of the main generator, and then the rectifying module converts the first alternating current into first direct current. In addition, besides the main generator can provide power for the vehicle, when the power battery pack meets a preset vehicle load threshold and a preset battery electric quantity threshold, the power battery pack can also provide certain power for the vehicle. The power battery pack may be connected to the DC/DC converter by a cable, so that the power battery pack may provide the second DC power to the DC/DC converter. After the DC/DC transformer boosts the second direct current, the boosted second direct current can be provided to the inversion module, the inversion module can convert the second direct current provided by the first direct current and/or the power battery pack into a second alternating current and provide the second alternating current to the traction motor, the traction motor can convert the second alternating current of the inversion module into mechanical energy to be output, and then the mechanical energy drives the speed reducer assembly. The speed reducer combination can be mechanically connected with the traction motor, wherein the speed reducer combination can comprise a speed reducer and a tire. The speed reducer combination can rotate under the driving of the traction motor, and can reduce the speed according to a preset speed reduction ratio, and the speed reduced speed acts on the tire to drive the tire to rotate, so that the vehicle is driven to run. Besides, the power battery pack can provide certain auxiliary power for the running of the vehicle, and can store electric energy generated during the braking of the vehicle. The traction converter can further comprise a chopping module, the vehicle combined power electric transmission system further comprises a brake resistor, and electric energy generated when the vehicle is braked can be consumed through the chopping module and the brake resistor.
Further, as a specific implementation of the method in fig. 1, an embodiment of the present application provides a vehicle combined power electric transmission method, as shown in fig. 3, including:
step 101, receiving a vehicle starting signal, determining a target power source from preset power sources based on a preset vehicle load threshold and a preset battery electric quantity threshold, and providing current for a traction converter through the target power source, wherein the preset power sources comprise an engine, a main generator and a power battery pack;
step 102, converting the current provided by the target power source into a second alternating current according to the traction converter, and providing the second alternating current to an electric wheel combination;
and 103, converting the second alternating current into mechanical energy through the electric wheel combination to drive the vehicle to run.
In this embodiment, a power source is preset, and the preset power source includes an engine, a main generator, and a power battery pack. After the vehicle receives the starting signal, the target power source can be determined according to a preset vehicle load threshold and a preset battery power threshold, and specifically, the power source can be selected from the preset power sources to serve as the target power source. For example, when the real vehicle load value is greater than a preset vehicle load threshold value and the residual electric quantity of the power battery pack is greater than a preset battery electric quantity threshold value, the engine, the main generator and the power battery pack are all determined as target power sources and provide driving force for the vehicle; when the real load value of the vehicle is greater than a preset load threshold value of the vehicle and the residual electric quantity of the power battery pack is less than a preset battery electric quantity threshold value, determining the engine and the main generator as target power sources; when the real vehicle load value is smaller than the preset vehicle load threshold value and the residual electric quantity of the power battery pack is larger than the preset battery electric quantity threshold value, the engine, the main generator and the power battery pack are all determined as target power sources, wherein the engine is adjusted to be in the state of the highest working efficiency, and the residual driving force is provided by the power battery pack. Then, the current provided by the target power source is converted into a second alternating current according to the traction converter, and the second alternating current is provided for the electric wheel combination, wherein the current provided by the target power source can be the first alternating current provided by the main generator or the second direct current provided by the power battery pack. When the current provided by the target power source is the first alternating current provided by the main generator, the first alternating current can be converted into a first direct current through the traction converter, and then the first direct current is converted into a second alternating current; when the current provided by the target power source is the second direct current provided by the power battery pack, the traction converter can directly convert the second direct current into second alternating current; when the current provided by the target power source includes both the first ac power provided by the main generator and the second dc power provided by the power battery, the traction converter may convert the first ac power into the first dc power, and then convert the first dc power and the second dc power into the second ac power together. After the second ac power is supplied to the electric wheel assembly, the electric wheel assembly may convert the second ac power into mechanical power to drive the vehicle to travel.
In the above-described embodiment of the present application, optionally, the engine, the main generator, and the electric wheel combination respectively include two; in step 101, the "determining a target power source from preset power sources based on a preset vehicle load threshold and a preset battery power threshold" specifically includes: when the actual vehicle load value is smaller than a preset vehicle load threshold value and the corresponding residual electric quantity of the power battery pack is larger than a preset battery electric quantity threshold value, taking one of the engine, one of the main generators and the power battery pack as the target power source; when the actual vehicle load value is smaller than a preset vehicle load threshold value and the corresponding residual electric quantity of the power battery pack is smaller than a preset battery electric quantity threshold value, taking one of the engines and one of the main generators as the target power sources; when the actual load value of the vehicle is larger than a preset load threshold value of the vehicle and the corresponding residual electric quantity of the power battery pack is larger than a preset battery electric quantity threshold value, taking the two engines, the two main generators and the power battery pack as the target power sources; and when the actual load value of the vehicle is greater than a preset load threshold value of the vehicle and the corresponding residual electric quantity of the power battery pack is less than a preset battery electric quantity threshold value, taking the two engines and the two main generators as the target power sources.
In the above embodiments of the present application, optionally, the traction converter includes two rectifying modules, two inverting modules and a voltage transformer; in step 102, the step of converting the current provided by the target power source into a second alternating current according to the traction converter specifically includes: when the target power source comprises an engine, a main generator and a power battery pack, converting first alternating current provided by the main generator into first direct current through the rectification module, boosting second direct current provided by the power battery pack through the voltage transformer, and converting the first direct current and the boosted second direct current into second alternating current through the inversion module; when the target power source comprises an engine and a main generator, the first alternating current provided by the main generator is converted into a first direct current through the rectifying module, and the first direct current is converted into a second alternating current through the inverting module.
In the above embodiments of the present application, optionally, the method further includes: receiving a vehicle braking signal, and judging the relation between the real vehicle load value and the preset vehicle load threshold value and the relation between the residual electric quantity corresponding to the power battery pack and the preset battery charging threshold value; when the real vehicle load value is smaller than the preset vehicle load threshold value and the residual electric quantity corresponding to the power battery pack is smaller than a preset battery charging threshold value, judging the relation between the voltage value in the traction converter and the preset chopping threshold value, and when the voltage value in the traction converter is smaller than the preset chopping threshold value, combining the engine, the main generator and the electric wheel into the power battery pack for charging; when the residual electric quantity corresponding to the power battery pack is larger than the preset battery charging threshold value, second charging alternating current generated by the electric wheel combination is provided to the chopping module, and the second charging alternating current is consumed through a brake resistor; when the residual electric quantity corresponding to the power battery pack is smaller than the preset battery charging threshold value and the voltage value in the traction converter is larger than the preset chopping threshold value, the second charging alternating current generated by the electric wheel combination is supplied to the voltage transformer for voltage reduction, the power battery pack is charged through the second charging alternating current after voltage reduction, and the second charging alternating current generated by the electric wheel combination is supplied to the chopping module after charging is finished, and the second charging alternating current is consumed through the brake resistor.
In the embodiment, when the power battery pack is charged through the combination of the engine, the main generator and the electric wheel, the main generator converts the first charging alternating current into the first charging direct current through the rectifying module, then the voltage of the first charging direct current is reduced through the voltage transformer, and the reduced first charging direct current is provided to the power battery pack so as to charge the power battery pack; and the second charging alternating current generated by the electric wheel combination is converted into second charging direct current through the inversion module, the second charging direct current is reduced in voltage through the voltage transformer, and the reduced second charging direct current is provided to the power battery pack so as to charge the power battery pack.
It should be noted that other corresponding descriptions of the functional units related to the vehicle combined power-electric transmission system provided in the embodiment of the present application may refer to the corresponding descriptions in the methods of fig. 1 to fig. 2, and are not repeated herein.
Those skilled in the art will appreciate that the figures are merely schematic representations of one preferred implementation scenario and that the blocks or flow diagrams in the figures are not necessarily required to practice the present application. Those skilled in the art will appreciate that the modules in the devices in the implementation scenario may be distributed in the devices in the implementation scenario according to the description of the implementation scenario, or may be located in one or more devices different from the present implementation scenario with corresponding changes. The modules of the implementation scenario may be combined into one module, or may be further split into a plurality of sub-modules.
The above application serial numbers are for description purposes only and do not represent the superiority or inferiority of the implementation scenarios. The above disclosure is only a few specific implementation scenarios of the present application, but the present application is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present application.

Claims (10)

1. A vehicle combined-power electric drive system, comprising:
the system comprises an engine, a main generator, a traction converter, a power battery pack and an electric wheel combination;
wherein, the engine with the main generator mechanical connection, the engine be used for main generator output mechanical energy is in order to drive the main generator rotates, the main generator with traction converter cable junction, the main generator be used for with mechanical energy turns into first alternating current, and provide first alternating current to traction converter, power battery group with traction converter cable junction, power battery group be used for when satisfying preset vehicle load threshold and preset battery power threshold, to provide second direct current to traction converter, and charge when the vehicle brakes, traction converter with electronic round of combination cable connection, traction converter be used for with first alternating current turns into first direct current, and with first direct current and/or the second direct current turns into second alternating current, and supplying the second alternating current to the electric wheel combination, wherein the electric wheel combination is used for driving the vehicle to run under the action of the second alternating current.
2. The system of claim 1 wherein said engine, said primary generator and said electric wheel assemblies are each comprised of two, wherein each of said engines is mechanically coupled to one of said primary generators and wherein both of said electric wheel assemblies are each cabled to said traction converter.
3. The system according to claim 2, characterized in that said traction converter comprises in particular:
the system comprises two rectifying modules, two inverting modules and a voltage transformer;
each rectification module is connected with one main generator cable and is used for converting the first alternating current provided by the main generator into a first direct current;
each inverter module is connected with one rectifier module and one electric wheel combination cable, and is used for converting the first direct current and/or the second direct current into second alternating current and providing the second alternating current for the electric wheel combination;
the voltage transformer is connected with the power battery pack, the rectifying module and the inversion module through cables, and is used for boosting the second direct current provided by the power battery pack and providing the boosted second direct current to the inversion module.
4. The system of claim 3, wherein the motorized wheel assembly includes a traction motor and a speed reducer assembly;
the traction motor is connected with the inverter module through a cable, and is used for converting the second alternating current into mechanical energy and driving the reducer assembly through the mechanical energy;
the speed reducer combination is mechanically connected with the traction motor and comprises a speed reducer and a tire, and the speed reducer combination is used for acting the mechanical energy on the tire according to a preset speed reduction ratio so as to drive the tire to rotate.
5. The system of claim 4, wherein the traction converter further comprises a chopper module;
the chopping module is connected with the rectifying module and the inverting module through cables, and is used for enabling the braking current in the traction converter to act on a braking resistor based on the residual electric quantity of the power battery pack when the vehicle is in a braking state;
the brake resistor is connected with the chopping module through a cable, and the brake resistor is used for consuming brake current provided by the chopping module.
6. The system of claim 5,
the engine is also used for providing mechanical energy for the main generator when the vehicle is in a braking state, the real vehicle load value corresponding to the vehicle is smaller than a preset vehicle load threshold value, the residual electric quantity corresponding to the power battery pack is smaller than a preset battery charging threshold value, and the voltage value corresponding to the traction converter is smaller than a preset chopping threshold value;
the main generator is also used for converting the mechanical energy into first charging alternating current;
the rectifying module is also used for converting the first charging alternating current into a first charging direct current;
the voltage transformer is also used for reducing the first charging direct current and providing the reduced first charging direct current to the power battery pack so as to charge the power battery pack;
the electric wheel combination is also used for generating a second charging alternating current when the vehicle is in a braking state;
the inversion module is further used for converting the second charging alternating current into a second charging direct current, and providing the second charging direct current to the power battery pack and/or the chopping module based on the residual electric quantity of the power battery pack and the preset battery charging threshold;
the engine is also used for providing mechanical energy for the main generator based on the residual capacity of the power battery pack when the vehicle is in a parking state.
7. A method of combined-power electric transmission for a vehicle, comprising:
receiving a vehicle starting signal, determining a target power source from preset power sources based on a preset vehicle load threshold and a preset battery electric quantity threshold, and providing current for a traction converter through the target power source, wherein the preset power sources comprise an engine, a main generator and a power battery pack;
converting the current provided by the target power source into a second alternating current according to the traction converter, and providing the second alternating current to an electric wheel combination;
and converting the second alternating current into mechanical energy through the electric wheel combination so as to drive the vehicle to run.
8. The method of claim 7, wherein the engine, the main generator, and the motorized wheel combination each comprise two; the method comprises the following steps of determining a target power source from preset power sources based on a preset vehicle load threshold and a preset battery power threshold, and specifically comprises the following steps:
when the actual vehicle load value is smaller than a preset vehicle load threshold value and the corresponding residual electric quantity of the power battery pack is larger than a preset battery electric quantity threshold value, taking one of the engine, one of the main generators and the power battery pack as the target power source;
when the actual vehicle load value is smaller than a preset vehicle load threshold value and the corresponding residual electric quantity of the power battery pack is smaller than a preset battery electric quantity threshold value, taking one of the engines and one of the main generators as the target power sources;
when the actual load value of the vehicle is larger than a preset load threshold value of the vehicle and the corresponding residual electric quantity of the power battery pack is larger than a preset battery electric quantity threshold value, taking the two engines, the two main generators and the power battery pack as the target power sources;
and when the actual load value of the vehicle is greater than a preset load threshold value of the vehicle and the corresponding residual electric quantity of the power battery pack is less than a preset battery electric quantity threshold value, taking the two engines and the two main generators as the target power sources.
9. The method of claim 8, wherein the traction converter comprises two rectification modules, two inversion modules, and a voltage transformer; the converting the current provided by the target power source into a second alternating current according to the traction converter specifically comprises:
when the target power source comprises an engine, a main generator and a power battery pack, converting first alternating current provided by the main generator into first direct current through the rectification module, boosting second direct current provided by the power battery pack through the voltage transformer, and converting the first direct current and the boosted second direct current into second alternating current through the inversion module;
when the target power source comprises an engine and a main generator, the first alternating current provided by the main generator is converted into a first direct current through the rectifying module, and the first direct current is converted into a second alternating current through the inverting module.
10. The method of claim 9, further comprising:
receiving a vehicle braking signal, and judging the relation between the real vehicle load value and the preset vehicle load threshold value and the relation between the residual electric quantity corresponding to the power battery pack and the preset battery charging threshold value;
when the real vehicle load value is smaller than the preset vehicle load threshold value and the residual electric quantity corresponding to the power battery pack is smaller than a preset battery charging threshold value, judging the relation between the voltage value in the traction converter and the preset chopping threshold value, and when the voltage value in the traction converter is smaller than the preset chopping threshold value, combining the engine, the main generator and the electric wheel into the power battery pack for charging;
when the residual electric quantity corresponding to the power battery pack is larger than the preset battery charging threshold value, second charging alternating current generated by the electric wheel combination is provided to the chopping module, and the second charging alternating current is consumed through a brake resistor;
when the residual electric quantity corresponding to the power battery pack is smaller than the preset battery charging threshold value and the voltage value in the traction converter is larger than the preset chopping threshold value, the second charging alternating current generated by the electric wheel combination is supplied to the voltage transformer for voltage reduction, the power battery pack is charged through the second charging alternating current after voltage reduction, and the second charging alternating current generated by the electric wheel combination is supplied to the chopping module after charging is finished, and the second charging alternating current is consumed through the brake resistor.
CN202111131405.5A 2021-09-26 2021-09-26 Vehicle combined power electric transmission system and method Pending CN113635783A (en)

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CN202111131405.5A CN113635783A (en) 2021-09-26 2021-09-26 Vehicle combined power electric transmission system and method

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Application Number Priority Date Filing Date Title
CN202111131405.5A CN113635783A (en) 2021-09-26 2021-09-26 Vehicle combined power electric transmission system and method

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