CN111267603A - New energy automobile hybrid power system and control method thereof - Google Patents

New energy automobile hybrid power system and control method thereof Download PDF

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Publication number
CN111267603A
CN111267603A CN202010092980.8A CN202010092980A CN111267603A CN 111267603 A CN111267603 A CN 111267603A CN 202010092980 A CN202010092980 A CN 202010092980A CN 111267603 A CN111267603 A CN 111267603A
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China
Prior art keywords
engine
battery
electric
motor
automobile
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CN202010092980.8A
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Chinese (zh)
Inventor
阳林
刘高辉
陈日东
梁绍臻
陈德升
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Guangdong University of Technology
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Guangdong University of Technology
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Priority to CN202010092980.8A priority Critical patent/CN111267603A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/38—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the driveline clutches
    • B60K6/387—Actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K13/00—Arrangement in connection with combustion air intake or gas exhaust of propulsion units
    • B60K13/04—Arrangement in connection with combustion air intake or gas exhaust of propulsion units concerning exhaust
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/24—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/26—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the motors or the generators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K6/00—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00
    • B60K6/20—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs
    • B60K6/22—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs
    • B60K6/28—Arrangement or mounting of plural diverse prime-movers for mutual or common propulsion, e.g. hybrid propulsion systems comprising electric motors and internal combustion engines ; Control systems therefor, i.e. systems controlling two or more prime movers, or controlling one of these prime movers and any of the transmission, drive or drive units Informative references: mechanical gearings with secondary electric drive F16H3/72; arrangements for handling mechanical energy structurally associated with the dynamo-electric machine H02K7/00; machines comprising structurally interrelated motor and generator parts H02K51/00; dynamo-electric machines not otherwise provided for in H02K see H02K99/00 the prime-movers consisting of electric motors and internal combustion engines, e.g. HEVs characterised by apparatus, components or means specially adapted for HEVs characterised by the electric energy storing means, e.g. batteries or capacitors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/04—Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using kinetic energy
    • 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
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies
    • 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

Abstract

The invention discloses a new energy automobile hybrid power system, which comprises an electric auxiliary driving system, an engine, an electromagnetic clutch, an exhaust control system, a generator and a controller, wherein the power output end of the electric auxiliary driving system is in transmission connection with a flywheel of the engine through the electromagnetic clutch, and the controller controls the separation or connection of the electromagnetic clutch; the power input end of the generator is connected with the exhaust control system; the controller detects the battery power in the electric auxiliary driving system and the fuel consumption rate in the working process of the engine through the sensor; the invention also discloses a control method. The electric auxiliary driving system drives the flywheel to rotate so as to assist the engine to start, start and run, so that the engine is positioned in the lowest fuel consumption rate area in the running process of the automobile, the fuel consumption of the automobile is reduced, a starting motor does not need to be independently arranged to drive the engine to start, the structural design is ingenious, and the fuel consumption and the cost investment of the starting motor are saved.

Description

New energy automobile hybrid power system and control method thereof
Technical Field
The invention belongs to the technical field of automobile hybrid power, and particularly relates to a new energy automobile hybrid power system and a control method thereof.
Background
With the development of social economy and the rapid increase of automobile holding capacity, the petroleum energy crisis is increasingly prominent, the automobile holding capacity is more and more, and the proportion of the energy consumption of the automobile in the total energy consumption proportion is higher and higher. Therefore, the automobile energy-saving problem is paid attention by various countries and is the subject of the development of the current automobile industry. One aspect of solving the energy problem is the development of new or alternative energy sources, such as electric vehicles, fuel cell vehicles or hybrid vehicles, and alcohol fuels or biofuels; another aspect is to make modifications or improvements to the structure of the vehicle for saving fuel consumption or recycling of the energy consumed by the emissions, like turbocharging, recuperation of braking energy, and utilization of engine exhaust energy.
However, the conventional hybrid power system does not have an auxiliary driving function, so that the engine cannot work in a low fuel consumption rate region to achieve the purposes of energy conservation and emission reduction, and for the conventional widely-used turbocharging system, although the exhaust gas energy utilization rate is high, because the exhaust gas energy utilization rate is high, an oil ring and a gas ring of a piston of the engine are easily damaged, the service life of the engine is further influenced.
Disclosure of Invention
The invention aims to solve the problems and provides a hybrid power system of a new energy automobile and a control method thereof. The system can save the original generator and starter of the automobile, is beneficial to the light weight of the automobile, recycles the waste gas energy to a large extent, and the electric quantity obtained by the waste gas power generation enables the engine to be in the area near the lowest fuel consumption rate, thereby achieving the aim of energy saving.
The purpose of the invention can be achieved by adopting the following technical scheme:
a hybrid power system of a new energy automobile comprises an electric auxiliary driving system, an engine, an electromagnetic clutch, an exhaust control system, a generator and a controller, wherein the power output end of the electric auxiliary driving system is in transmission connection with a flywheel of the engine through the electromagnetic clutch, and the controller controls the separation or connection of the electromagnetic clutch; the power input end of the generator is connected with the airflow output end of the exhaust control system; the controller detects the electric quantity of a battery in the electric auxiliary driving system and the fuel consumption rate of the engine in the working process through a sensor;
when the automobile starts, the controller controls the electromagnetic clutch to be connected, when the sensor detects that the electric quantity of the battery of the electric auxiliary driving system is not lower than a set value, the controller controls the motor of the electric auxiliary driving system to be started and drives the engine to be started through the flywheel, and the engine is driven to start and accelerate in an auxiliary mode; when the battery electric quantity of the electric auxiliary driving system is lower than a set value, the controller controls the motor to start the engine; the motor assists the engine to start and accelerate with low power, or the controller controls the electromagnetic clutch to be disconnected and the motor to stop, and the starting and accelerating of the automobile are completed by the engine alone;
when the fuel consumption rate of the engine is higher than a set value and the electric quantity of the battery is not lower than the set value in the running process of the automobile, the motor drives the engine in an auxiliary mode so that the engine is located in a lowest fuel consumption rate area; if the fuel consumption rate of the engine is higher than the set value and the electric quantity of the battery is lower than the set value, the electric motor assists the engine to work in a low power mode or does not work, and meanwhile the controller controls the exhaust control system to drive the generator to generate electricity to charge the battery.
Further, the electric auxiliary driving system comprises a rectifying and voltage-stabilizing control device, an electric motor and a battery for providing electric energy for the rectifying and voltage-stabilizing control device and the electric motor, wherein the rectifying and voltage-stabilizing control device is electrically connected with the battery, the electric motor and the generator; the controller controls the charging or discharging of the battery and the working state of the motor through the rectifying and voltage-stabilizing control device.
Further, exhaust control system includes turbine assembly, planetary gear reduction mechanism and discharge valve, the pivot of generator is passed through planetary gear reduction mechanism and is connected with turbine assembly, discharge valve's air inlet and the gas vent intercommunication of engine, the external air in discharge valve's gas outlet, when discharge valve opened, the waste gas of engine was discharged to the external world through discharge valve.
Furthermore, cooling liquid channel loops which are communicated with each other are arranged on the planetary gear speed reducing mechanism, the generator and the turbine assembly.
Further, the controller is a single chip microcomputer or a PLC.
A control method of a hybrid power system of a new energy automobile comprises the following steps:
s1, detecting the electric quantity of a battery in the electric auxiliary driving system and the fuel consumption rate of the engine in the working process through a sensor by the controller;
s2, when the automobile starts, the controller controls the electromagnetic clutch to be connected, when the sensor detects that the electric quantity of the battery of the electric auxiliary driving system is not lower than a set value, the controller controls the motor of the electric auxiliary driving system to start and drives the engine to start through the flywheel, and the auxiliary driving engine starts to accelerate; when the battery electric quantity of the electric auxiliary driving system is lower than a set value, the controller controls the motor to start the engine; the motor assists the engine to start and accelerate with low power, or the controller controls the electromagnetic clutch to be disconnected and the motor to stop, and the starting and accelerating of the automobile are completed by the engine alone;
s3, when the fuel consumption rate of the engine is higher than a set value and the electric quantity of the battery is not lower than the set value in the running process of the automobile, the motor drives the engine in an auxiliary mode so that the engine is in a lowest fuel consumption rate area; if the fuel consumption rate of the engine is higher than a set value and the electric quantity of the battery is lower than the set value, the motor assists the engine to work in a low-power mode or does not work, and meanwhile the controller controls the exhaust control system to drive the generator to generate electricity to charge the battery;
when the automobile is temporarily stopped and waits, the automobile ECU controls the engine to be shut down, the battery for the electric equipment of the automobile is supplied, and the steps S2 and S3 are repeated after the automobile is green.
The implementation of the invention has the following beneficial effects:
1. the electric auxiliary driving system drives the flywheel to rotate so as to assist the engine to start, start and run, so that the engine is positioned in the lowest fuel consumption rate area in the running process of the automobile, the fuel consumption of the automobile is reduced, a starting motor does not need to be independently arranged to drive the engine to start, the structural design is ingenious, and the fuel consumption and the cost investment of the starting motor are saved.
2. The invention utilizes the exhaust gas discharged by the engine to drive the engine to work to generate electric energy, abandons the structure that the engine is connected to the power output end of the engine through the transmission mechanism of the belt wheel and the belt, reduces the load of the engine, maximally utilizes and recovers the energy of the exhaust gas discharged by the engine, and further reduces the oil consumption of the engine.
3. The invention arranges the exhaust valve on the exhaust port of the engine, when the exhaust valve is closed (namely the engine exhaust energy is used for generating power): 1) the turbine speed does not exceed the maximum allowable generator speed, and the battery capacity does not reach a full state. Partially open state of exhaust valve: 1) the turbine speed exceeds the allowable highest speed of the generator and the battery capacity does not reach a full state; 2) the turbine speed does not exceed the maximum allowable generator speed but the battery reaches a full-power state, and the power generation amount of the generator is used for auxiliary driving and automobile electric appliances. Fully opening the exhaust valve: this condition typically occurs when the engine is started with the exhaust valve fully open to reduce exhaust resistance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a hybrid power system of a new energy automobile.
FIG. 2 is a schematic plane connection structure diagram of the hybrid power system of the new energy automobile.
Fig. 3 is a graph showing all characteristics of the engine.
FIG. 4 is a control flow block diagram of the hybrid power system of the new energy automobile.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Examples
Referring to fig. 1 and 2, the present embodiment relates to a hybrid power system of a new energy automobile, including an electric auxiliary driving system 1, an engine 2, an electromagnetic clutch 3, an exhaust control system 4, a generator 5, and a controller, wherein a power output end of the electric auxiliary driving system 1 is in transmission connection with a flywheel 10 of the engine 2 through the electromagnetic clutch 3, and the controller controls the separation or engagement of the electromagnetic clutch 3; the power input end of the generator 5 is connected with the airflow output end of the exhaust control system 4; the controller detects the electric quantity of a battery in the electric auxiliary driving system 1 and the fuel consumption rate of the engine 2 in the working process through sensors;
when the automobile starts, the controller controls the electromagnetic clutch 3 to be connected, when the sensor detects that the electric quantity of the battery of the electric auxiliary driving system 1 is not lower than a set value, the controller controls the motor of the electric auxiliary driving system 1 to be started, the engine 2 is driven to be started through the flywheel 10, and the auxiliary driving engine 2 starts to accelerate; when the battery power of the electric auxiliary driving system 1 is lower than a set value, the controller controls the electric motor 12 to start the engine; the motor 12 assists the engine to start and accelerate with low power, or the controller controls the electromagnetic clutch 3 to be disconnected and the motor 12 to stop, and the starting and accelerating of the automobile is completed by the engine 2 alone;
when the fuel consumption rate of the engine 2 is higher than a set value and the electric quantity of the battery is not lower than the set value during the running of the automobile, the motor 12 assists to drive the engine 2 so that the engine 2 is in a lowest fuel consumption rate area; if the fuel consumption rate of the engine 2 is higher than the set value and the electric quantity of the battery is lower than the set value, the electric motor 12 assists the engine 2 to work with low power, or the electric motor 12 does not work, and the controller controls the exhaust control system 4 to drive the generator 5 to generate power to charge the battery 13.
The structure assists the engine 2 to start, start and run by driving the flywheel 10 to rotate through the electric auxiliary driving system 1, so that the engine 2 is in the lowest fuel consumption area in the running process of the automobile, the fuel consumption of the automobile is reduced, the starting motor does not need to be independently arranged to drive the engine 2 to start, the structural design is ingenious, and the fuel consumption and the cost investment of the starting motor are saved. In addition, the exhaust gas discharged by the engine 2 is used for driving the engine to work to generate electric energy, the structure that the engine is connected to the power output end of the engine through a transmission mechanism with a belt wheel and a belt is abandoned, the load of the engine is reduced, the energy of the exhaust gas discharged by the engine is utilized and recovered to the maximum extent, and the oil consumption of the engine is further reduced.
The electric auxiliary driving system 1 comprises a rectification voltage-stabilizing control device 11, an electric motor 12 and a battery 13 for supplying electric energy to the rectification voltage-stabilizing control device 11 and the electric motor 12, wherein the rectification voltage-stabilizing control device 11 is electrically connected with the battery 13, the electric motor 12 and the generator 12; the controller controls the charging or discharging of the battery 13 and the operating state of the motor 12 through the rectifying and voltage-stabilizing control device 11.
The exhaust control system 4 comprises a turbine assembly 41, a planetary gear speed reducing mechanism 42 and an exhaust valve 43, a rotating shaft of the generator 5 is connected with the turbine assembly 41 through the planetary gear speed reducing mechanism 42, an air inlet of the exhaust valve 43 is communicated with an air outlet of the engine 2, air is externally connected to an air outlet of the exhaust valve 43, and when the exhaust valve 43 is opened, waste gas of the engine 2 is exhausted to the outside through the exhaust valve 43.
By providing the exhaust valve 43 on the exhaust port of the engine 2, when the exhaust valve 43 is closed (i.e., the engine exhaust energy is used for power generation): 1) the turbine speed does not exceed the maximum allowable speed of the generator 5, and the battery 13 is not charged to a full state. Partially opened state of the exhaust valve 43: 1) the turbine speed exceeds the maximum allowable speed of the generator 5 and the battery 13 is not fully charged; 2) the turbine speed does not exceed the maximum speed allowed by the generator 5 but the battery 13 reaches a full state, and the power generation amount of the generator 5 is used for auxiliary driving and automobile electric appliances, and fig. 2 is a schematic diagram of partial opening of the exhaust valve 43. Fully open exhaust valve 43: this condition typically occurs at engine start-up with the exhaust valve 43 fully open to reduce exhaust resistance.
The planetary gear speed reducing mechanism 42, the generator 5 and the turbine assembly 41 are all provided with mutually communicated cooling liquid channel loops. The planetary gear reduction mechanism 42 can reduce the resistance of the exhaust gas of the engine 2.
The controller is a single chip microcomputer or a PLC. Of course, other devices with functions of a single chip microcomputer or a PLC can also be used as the controller of the invention.
The embodiment also provides a control method of the hybrid power system of the new energy automobile, which comprises the following steps:
s1, the controller detects the electric quantity of the battery 13 in the electric auxiliary driving system 1 and the fuel consumption rate of the engine 2 in the working process through the sensors;
s2, when the automobile starts, the controller controls the electromagnetic clutch 3 to be connected, when the sensor detects that the electric quantity of the battery 13 of the electric auxiliary driving system 1 is not lower than a set value, the controller controls the motor 12 of the electric auxiliary driving system 1 to be started, the engine 2 is driven to be started through the flywheel 10, and the auxiliary driving engine 2 starts to accelerate; when the electric quantity of the battery 13 of the electric auxiliary driving system 1 is lower than a set value, the controller controls the electric motor 12 to start the engine; the motor 12 assists the engine to start and accelerate with low power, or the controller controls the electromagnetic clutch 3 to be disconnected and the motor 12 to stop, and the starting and accelerating of the automobile is completed by the engine 2 alone;
s3, when the fuel consumption rate of the engine 2 is higher than the set value and the electric quantity of the battery 13 is not lower than the set value in the running process of the automobile, the motor 12 assists to drive the engine 2 to enable the engine 2 to be in the lowest fuel consumption rate area; if the fuel consumption rate of the engine 2 is higher than the set value and the electric quantity of the battery 13 is lower than the set value, the electric motor 12 assists the engine to work with low power, or the electric motor 12 does not work, and meanwhile the controller controls the exhaust control system 4 to drive the generator 5 to generate electricity to charge the battery 13;
when the vehicle is temporarily stopped and waiting, the vehicle ECU controls the engine to be turned off, the electric battery 13 for the vehicle electric equipment is supplied, and steps S2 and S3 are repeated after the vehicle is turned green.
For the detection of the fuel consumption rate of the engine, the controller of the hybrid system detects the fuel consumption rate b of the engine at any momenteWherein the fuel consumption b of the internal combustion engineeThe unit is g/kW.h, which means the mass of fuel consumed by the internal combustion engine per output of 1 kW.h.
Fuel consumption b of engineeThe determination of (1):
according to engine power expression
Figure BDA0002384333380000061
In the formula Pe-engine power, kW;
Ttq-engine crankshaft torque, N · m;
n is the engine crankshaft speed, r/min;
torque sensor and speed sensor mounted on engine cylinder block for measuring torque T of engine crankshafttqA flow meter mounted on the fuel pipeline of the engine 2 measures the fuel consumption △ b of the engine 2 in g/h and transmits the signal to a hybrid system controller which calculates the fuel consumption b of the engine 2 according to the obtained informatione。
For the purpose of saving energy in a hybrid systemThe hybrid control system is required to control the operation of the driving motor 12 according to the fuel consumption rate of the engine in combination with the remaining capacity SOC of the battery 13, the exhaust turbine rotation speed, the engine operating condition, etc. according to the universal characteristic curve of the engine, so as to adjust the fuel consumption rate of the engine such that the fuel consumption rate b of the engine is adjustedeIn the low fuel consumption region in the figure, fig. 3 is a graph showing all characteristics of the engine; the control logic of the control system is designed on the basis of the above idea. Fig. 4 shows a control logic diagram of the control system.
Description of the case where the motor 12 is driven:
form in rotational motion according to newton's second law:
Figure BDA0002384333380000071
Figure BDA0002384333380000072
the equation describes a dynamic process, when the left side of the equation is 0, the whole system is in a steady state, that is, the output torque of the driving motor 12 is the same as the load torque, the speed of the system rotation is constant, the acceleration of the rotation speed is 0, and the system is in a steady state operation. Discussing the operation condition under load (suitable for the high-low power condition of the motor 12), under the condition, setting the power of the motor 12 to be constant, the power of the whole vehicle driving system (the sum of the power of the engine and the power of the motor 12) to be constant, and the fuel consumption rate of the engine to be in a higher fuel consumption rate area, wherein the engine can be regarded as the system load at the moment; at this time, the hybrid system controls the motor 12 to run at a certain constant power, the motor 12 is in a no-load mode at the initial starting stage, the motor 12 is in a no-load mode (in the no-load mode, the motor 12 continuously accelerates to a set maximum rotating speed or to a maximum rotating speed limited by a back electromotive force of the motor 12, wherein the maximum rotating speed is far higher than the maximum rotating speed of an engine), when the rotating speed of the motor 12 is lower, the rotating speed of the motor 12 is increased until the rotating speed reaches a specified joint rotating speed (at this time, the rotating speed of the motor 12 is still increased; the joint rotating speed of the motor 12 is greater than the rotating speed of the engine, specific rotating speed values are given according to different working conditions); in the initial stage of the load working condition, the output torque of the motor 12 is greater than the load torque, the power of the whole vehicle driving system is constant, and the hybrid system must control the fuel injection quantity of the engine to decrease in order to decrease the fuel consumption rate of the engine, namely the power of the engine decreases and the rotating speed of the engine does not change greatly, so that the fuel consumption rate of the engine can be known to be optimized by the universal characteristic curve diagram of the engine; at this time, the driving power of the whole vehicle is compensated by the motor 12, the rotating speed of the motor 12 is continuously increased to balance the torque of the driving motor 12 with the load torque, and at this time, the system is balanced, and the system torque and the rotating speed are kept stable.
For the logical analysis of the opening and closing of the exhaust valve 43, the fully closed condition of the exhaust valve 43 (i.e. the engine exhaust energy is fully used for power generation): 1) the turbine speed does not exceed the maximum allowable speed of the generator 5, and the battery 13 is not charged to a full state. Partially opened state of the exhaust valve 43: 1) the turbine speed exceeds the maximum allowable speed of the generator 5 and the battery 13 is not fully charged; 2) the turbine speed does not exceed the maximum speed allowed by the generator 5 but the battery 13 reaches a full state, and the power generation amount of the generator 5 is used for auxiliary driving and automobile electric appliances, and fig. 2 is a schematic diagram of partial opening of the exhaust valve 43. Fully open exhaust valve 43: this condition typically occurs at engine start-up with the exhaust valve 43 fully open to reduce exhaust resistance.
While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiment, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims (6)

1. The hybrid power system of the new energy automobile is characterized by comprising an electric auxiliary driving system, an engine, an electromagnetic clutch, an exhaust control system, a generator and a controller, wherein the power output end of the electric auxiliary driving system is in transmission connection with a flywheel of the engine through the electromagnetic clutch, and the controller controls the separation or connection of the electromagnetic clutch; the power input end of the generator is connected with the airflow output end of the exhaust control system; the controller detects the electric quantity of a battery in the electric auxiliary driving system and the fuel consumption rate of the engine in the working process through a sensor;
when the automobile starts, the controller controls the electromagnetic clutch to be connected, when the sensor detects that the electric quantity of the battery of the electric auxiliary driving system is not lower than a set value, the controller controls the motor of the electric auxiliary driving system to be started and drives the engine to be started through the flywheel, and the engine is driven to start and accelerate in an auxiliary mode; when the battery electric quantity of the electric auxiliary driving system is lower than a set value, the controller controls the motor to start the engine; the motor assists the engine to start and accelerate with low power, or the controller controls the electromagnetic clutch to be disconnected and the motor to stop, and the starting and accelerating of the automobile are completed by the engine alone;
when the fuel consumption rate of the engine is higher than a set value and the electric quantity of the battery is not lower than the set value in the running process of the automobile, the motor drives the engine in an auxiliary mode so that the engine is located in a lowest fuel consumption rate area; if the fuel consumption rate of the engine is higher than the set value and the electric quantity of the battery is lower than the set value, the electric motor assists the engine to work in a low power mode or does not work, and meanwhile the controller controls the exhaust control system to drive the generator to generate electricity to charge the battery.
2. The hybrid power system of the new energy automobile according to claim 1, wherein the electric auxiliary driving system comprises a rectifying and voltage-stabilizing control device, an electric motor and a battery for supplying electric energy to the rectifying and voltage-stabilizing control device and the electric motor, and the rectifying and voltage-stabilizing control device is electrically connected with the battery, the electric motor and a generator; the controller controls the charging or discharging of the battery and the working state of the motor through the rectifying and voltage-stabilizing control device.
3. The hybrid power system of the new energy automobile according to claim 1, wherein the exhaust control system comprises a turbine assembly, a planetary gear speed reduction mechanism and an exhaust valve, a rotating shaft of the generator is connected with the turbine assembly through the planetary gear speed reduction mechanism, an air inlet of the exhaust valve is communicated with an air outlet of the engine, an air outlet of the exhaust valve is externally connected with air, and when the exhaust valve is opened, exhaust gas of the engine is exhausted to the outside through the exhaust valve.
4. The hybrid power system of the new energy automobile as claimed in claim 3, wherein the planetary gear reduction mechanism, the generator and the turbine assembly are provided with mutually communicated cooling fluid passage circuits.
5. The hybrid power system of the new energy automobile as claimed in claim 1, wherein the controller is a single chip microcomputer or a PLC.
6. The control method of the hybrid power system of the new energy automobile according to any one of claims 1 to 5, characterized by comprising the following steps:
s1, detecting the electric quantity of a battery in the electric auxiliary driving system and the fuel consumption rate of the engine in the working process through a sensor by the controller;
s2, when the automobile starts, the controller controls the electromagnetic clutch to be connected, when the sensor detects that the electric quantity of the battery of the electric auxiliary driving system is not lower than a set value, the controller controls the motor of the electric auxiliary driving system to start and drives the engine to start through the flywheel, and the auxiliary driving engine starts to accelerate; when the battery electric quantity of the electric auxiliary driving system is lower than a set value, the controller controls the motor to start the engine; the motor assists the engine to start and accelerate with low power, or the controller controls the electromagnetic clutch to be disconnected and the motor to stop, and the starting and accelerating of the automobile are completed by the engine alone;
s3, when the fuel consumption rate of the engine is higher than a set value and the electric quantity of the battery is not lower than the set value in the running process of the automobile, the motor drives the engine in an auxiliary mode so that the engine is in a lowest fuel consumption rate area; if the fuel consumption rate of the engine is higher than a set value and the electric quantity of the battery is lower than the set value, the motor assists the engine to work in a low-power mode or does not work, and meanwhile the controller controls the exhaust control system to drive the generator to generate electricity to charge the battery;
when the automobile is temporarily stopped and waits, the automobile ECU controls the engine to be shut down, the battery for the electric equipment of the automobile is supplied, and the steps S2 and S3 are repeated after the automobile is green.
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