CN104553740A - Six-drive hybrid power system and control method thereof - Google Patents
Six-drive hybrid power system and control method thereof Download PDFInfo
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- CN104553740A CN104553740A CN201510023978.4A CN201510023978A CN104553740A CN 104553740 A CN104553740 A CN 104553740A CN 201510023978 A CN201510023978 A CN 201510023978A CN 104553740 A CN104553740 A CN 104553740A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/84—Data processing systems or methods, management, administration
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Abstract
The invention discloses a six-drive hybrid power system and a control method thereof. The six-drive hybrid power system is characterized by comprising a power system and an electricity supply system of each of a front axle, an intermediate axle and a rear axle; the front axle power system comprises an engine, an engine controller, a starter, an ISG motor, an ISG motor controller, a speed changing box, a speed changing box controller and a front axle body; according to the intermediate axle power system, an intermediate axis motor provides drive power for the intermediate axle; according to the rear axle power system, a rear axis motor provides drive power for the rear axle; the electricity supply systems respectively supply electricity for the ISG motor, the middle axis motor and the rear axis motor. The six-drive hybrid power system and the control method thereof are capable of effectively improving the fuel economy of an automobile; the six-drive hybrid power system realizes low-noise driving when needed, the all-condition use performance of the automobile is improved, the control precision is improved, the real-time control is realized, and a driver can directly select a proper drive mode.
Description
Technical field
The invention belongs to new-energy automobile control field, is more particularly a kind of six driving mixed power system and control methods thereof.
Background technology
Drive automobile when the first six and be generally traditional ICE-powered all-wheel driven vehicle, driving system adopts and entirely drives design in real time.For meeting the specific demand of cross country car, generally select the driving engine that power is larger.And in the condition of normal use, the demand power of automobile is less, driving engine is often operated in low load region, causes the problems such as power dissipation, fuel consumption rate are high, discharge is high.Meanwhile, adopt engine-driven cross-country car to be difficult to realize low noise and travel, therefore can not meet and have the special occasions of low noise requirement to use.In addition, six driving mixed power systems comprise propons power system, jackshaft power system, rear axle power system and electric power supply system, as long as generally there is a place impaired, whole automobile and in paralyzed state, is difficult to the operating needs meeting full working scope.Be in the torque co-ordinated control method of transition mode at hybrid vehicle, the general driving engine dynamic torque that adopts is estimated to add the method that motor torque compensates.But dynamic torque is estimated to there is calculation of complex, is difficult to realize controlling in real time and the problem chosen of evaluated error dependence design accuracy.In addition, adopt the data reflection Dynamic Torque Characteristic of driving engine and the engagement characteristics of power-transfer clutch testing and obtain, very high to the requirement of test, and process of the test labour intensity is large, wastes time and energy.
General Control Strategy for Hybrid Electric Vehicle is built in automobile chip, and user cannot revise and can not realize manually selecting according to the subjective judgement of chaufeur; What current sphere of learning adopted have self adaptation, the control policy of self study often exists and can only be used for off-line simulation, can not realize the problem that controls in real time.
Summary of the invention
The present invention is the weak point for avoiding existing for above-mentioned prior art, provides a kind of six driving mixed power system and control methods thereof, with improve automobile fuel economy, realize when needs low noise travel; Improve automobile full working scope in-use performance; Improve high also realization of control accuracy to control in real time; And applicable type of drive can be selected according to the subjective judgement of navigating mate.
The present invention is that technical solution problem adopts following technical scheme:
The feature of the present invention six driving mixed power system is: described hybrid power system comprises propons power system, jackshaft power system, rear axle power system and electric power supply system;
Described propons power system comprises driving engine and engine controller, starter for fire an engine, ISG motor and ISG electric machine controller, change speed gear box and gearbox control, and propons; Described driving engine is connected for coaxial with described ISG motor, described driving engine and described ISG motor are independent or jointly drive propons, power-transfer clutch one is set between the output shaft and the input shaft of ISG motor of described driving engine, for engaging or interrupt the outputting power of driving engine; Power-transfer clutch two is set between the output shaft and the input shaft of change speed gear box of described ISG motor, for engaging or interrupting propons power;
Described jackshaft power system comprises central-shaft motor, central-shaft motor controller, and is provided the jackshaft of propulsive effort by central-shaft motor;
Described rear axle power system comprises rear spindle motor, rear axle electric machine controller, and is provided the back axle of propulsive effort by rear spindle motor;
Described electric power supply system comprises electrokinetic cell, electrokinetic cell controller, A-battery, battery charger, inverter one, inverter two and inverter three; Described electrokinetic cell by the first inverter for ISG motor provides electric power, by the second inverter for central-shaft motor provides electric power, by the 3rd inverter for rear spindle motor provides electric power; Described electrokinetic cell can also be powered for external equipment, and is that described A-battery is powered by DC/DC, and described battery charger is power battery charging by external source.
The feature of the present invention six driving mixed power system is also: the mode of operation arranging described system comprises:
4 wheel driven electric-only mode: jointly driven by described central-shaft motor and rear spindle motor; Power-transfer clutch one disconnects, and power-transfer clutch two disconnects, and jackshaft power system engages, rear axle power system engages, and provide chaufeur request torque by central-shaft motor and rear spindle motor, central-shaft motor and the ratio of the Driving Torque of rear spindle motor equal the axle load ratio of axis, rear axle;
Six drive electric-only mode: jointly driven by described ISG motor, central-shaft motor and rear spindle motor; Power-transfer clutch one disconnects, and power-transfer clutch two engages, and jointly provides chaufeur request torque by ISG motor and central-shaft motor, rear spindle motor, and the ratio of the Driving Torque of described ISG motor, central-shaft motor and rear spindle motor equals the axle load ratio of front axle, axis, rear axle;
Six driving mixed power patterns one: jointly driven by described driving engine, ISG motor, central-shaft motor and rear spindle motor; Power-transfer clutch one and power-transfer clutch two are joint, jointly provide chaufeur request torque by driving engine, ISG motor, central-shaft motor and rear spindle motor; Wherein, central-shaft motor and rear spindle motor all provide the maximum torque under current rotating speed, and extra demand torque is supplemented by propons power system; ISG motor is for regulating the rate of load condensate of driving engine, and preferential guarantee engine operation is at best fuel oil consumption district lower limit; If the maximum output torque that ISG motor output torque reaches under current rotating speed still cannot meet chaufeur request torque, then improve the Driving Torque of driving engine to meet chaufeur request torque, until the upper limit in engine output torque best fuel-economy district under reaching its current rotating speed.
Six driving mixed power patterns two: jointly driven by described driving engine, ISG motor, central-shaft motor and rear spindle motor; Power-transfer clutch one and power-transfer clutch two are joint, jointly provide chaufeur request torque by driving engine, ISG motor, central-shaft motor, rear spindle motor; Preferential guarantee engine operation is in the upper limit in best fuel-economy district, ISG motor is for adjusting the rate of load condensate of driving engine, extra torque is supplemented jointly by central-shaft motor and rear spindle motor, and the ratio of the Driving Torque of central-shaft motor, rear spindle motor equals the axle load ratio of axis and rear axle; When ISG motor output torque reaches the maximum output torque under current rotating speed but still cannot meet chaufeur request torque, improve the Driving Torque of driving engine to meet chaufeur request torque, until engine output torque reaches the maximum output torque under its current rotating speed;
Tandem drive pattern one: by ISG electric power generation described in described driven by engine, is driven jointly by described central-shaft motor and rear spindle motor; Power-transfer clutch one engages, and power-transfer clutch two disconnects, and jointly provides chaufeur request torque by central-shaft motor, rear spindle motor, and the ratio of motor output torque equals the axle load ratio of axis, rear axle; Smaller value between the maximum charge torque that under the lower limit torque that engine output torque is its best fuel-economy district and current rotating speed, ISG motor can send, by driven by engine ISG electric power generation, the electric energy sent provides electric energy for giving central-shaft motor and rear spindle motor, and part more than needed is used for power battery charging;
Tandem drive pattern two: power-transfer clutch one engages, power-transfer clutch two disconnects, and jointly provides chaufeur request torque by central-shaft motor, rear spindle motor, and the ratio of motor output torque equals the axle load ratio of axis and rear axle; Smaller value between the maximum charge torque that under the upper limit torque that engine output torque is its best fuel-economy district and current rotating speed, ISG motor can send, by driven by engine ISG electric power generation, the electric energy sent provides electric energy for giving central-shaft motor and rear spindle motor, and part more than needed is used for power battery charging;
Engine drive mode: driven separately by described driving engine; Power-transfer clutch one and power-transfer clutch two are joint, and driving engine exports the maximum torque under current rotating speed, and torque more than needed is power battery charging for driving ISG motor;
Failure mode: if propons power system lost efficacy, then perform 4 wheel driven electric-only mode; If jackshaft power system lost efficacy, then by propons power system and the system combined driving of rear axle power, engine operation was in best fuel oil consumption district, and ISG motor is for adjusting engine load rate, and extra torque is provided by rear spindle motor; If rear axle power thrashing, then combine driving by propons power system and jackshaft power system, engine operation is in best fuel oil consumption district, and ISG motor is for adjusting engine load rate, and extra torque is provided by central-shaft motor; If electric power supply system lost efficacy, then performed engine drive mode; If there are two inefficacies in power system, then drive by one that is left; For other situation of failure mode, system gives a warning and stops.
The feature of the control method of the present invention six driving mixed power system is: first whether have one or more cisco unity malfunction in the propons power system of the section of sentencing hybrid power system, jackshaft power system, rear axle power system and electric power supply system, if, perform failure mode, if not, other mode of operations of described hybrid power system are automatically performed according to the following rules:
If electrokinetic cell SOC is high, and chaufeur request torque is little, perform 4 wheel driven electric-only mode;
If electrokinetic cell SOC is high, and during chaufeur request torque is, performs six and drive electric-only mode;
If electrokinetic cell SOC is high, and chaufeur request torque is large, performs six driving mixed power patterns one;
If during electrokinetic cell SOC is, and chaufeur request torque is little, perform tandem drive pattern one;
If during electrokinetic cell SOC is, and chaufeur request torque be in or large, perform six driving mixed power patterns two;
If electrokinetic cell SOC is low, and chaufeur request torque is little, performs tandem drive pattern two;
If electrokinetic cell SOC is low, and chaufeur request torque be in or large, perform the independent drive pattern of driving engine;
The feature of the control method of the present invention six driving mixed power system is also: arrange manual switchover module, and described manual switchover module is electric-only mode for the described hybrid power system of direct switching or is hybrid mode;
In described electric-only mode, be automatically chosen as 4 wheel driven electric-only mode or six according to the following rules and drive electric-only mode: if electrokinetic cell SOC is for high, and chaufeur request torque is little, performs 4 wheel driven electric-only mode; If electrokinetic cell SOC is high, chaufeur request torque performs six and drives electric-only mode in being; If chaufeur request torque is large, system gives a warning and automatically performs six and drives electric-only mode; In other situations, chaufeur manual switchover is that hybrid mode is invalid, and system keeps original running state.
In described hybrid mode, automatically select six driving mixed power pattern one or six driving mixed power patterns two according to the following rules: if electrokinetic cell SOC is for high, and chaufeur request torque is large, performs six driving mixed power patterns one; If during electrokinetic cell SOC is, and chaufeur request torque be in or large, perform six driving mixed power patterns two; In other situations, chaufeur manual switchover is that hybrid mode is invalid, and system keeps original running state.
The feature of the control method of the present invention six driving mixed power system is also: when described hybrid power system relate to switch between driving engine start and stop and the mode of operation not relating to driving engine start and stop time, larger fluctuation or interruption is produced for avoiding power system Driving Torque, the Driving Torque sum arranging axis and rear axle is the difference that chaufeur request torque deducts the actual Driving Torque of front axle, and central-shaft motor and the ratio of the Driving Torque of rear spindle motor equal the axle load ratio of axis and rear axle.
The feature of the control method of the present invention six driving mixed power system is also:
Described electrokinetic cell SOC is that height refers to that electrokinetic cell SOC is greater than its expected value SOC
obj;
Described electrokinetic cell SOC refers in being that electrokinetic cell SOC is between its expected value SOC
objwith the low value SOC of setting
lowbetween;
Described electrokinetic cell SOC is the low low value SOC that electrokinetic cell SOC value is less than setting that refers to
lowtime;
Described chaufeur request torque refers to for little the maximum torque sum that chaufeur request torque is less than central-shaft motor and rear spindle motor and can provides;
Described chaufeur request torque in refer to the maximum torque sum that chaufeur request torque is not less than central-shaft motor and rear spindle motor and can provides, and be less than or equal to ISG motor, maximum torque sum that central-shaft motor, rear spindle motor can provide;
Described chaufeur request torque is for referring to greatly the maximum torque sum that chaufeur request torque is greater than ISG motor, central-shaft motor and rear spindle motor and can provides.
Compared with prior art, beneficial effect of the present invention is embodied in:
1, the present invention adopts six driving mixed power systems, eliminates transmission shaft, adopts the driving engine of smaller power, on the basis ensureing the dynamic property of automobile, crossing ability, improves the fuel economy of automobile and the travelling comfort of occupant.When propons power system, jackshaft power system, rear axle power system, electric power supply system have one or more cisco unity malfunction, automobile can be driven by the power system be left.When by some Special section, utilize its pure electronic drive pattern greatly can reduce noise.
2, arrange transition mode in the present invention, its torque co-ordinated control method control accuracy is high, can realize real-time control easily, and can save the experimentation cost at initial stage.
3, control method of the present invention according to different needs, can select the type of drive be applicable to according to the subjective judgement of chaufeur.
4, time specific embodiment of the invention is also embodied in necessity, its hybrid power system as vehicular power plant, can provide electric energy to external consumer according to actual needs.
Accompanying drawing explanation
Fig. 1 is present system structural representation;
Fig. 2 is the automatic mode control block diagram of present system;
Fig. 3 is the manual mode control block diagram of present system;
Detailed description of the invention
In the present embodiment, the version of six driving mixed power systems is: hybrid power system comprises propons power system, jackshaft power system, rear axle power system and electric power supply system.
Propons power system comprises driving engine and engine controller, starter for fire an engine, ISG motor and ISG electric machine controller, change speed gear box and gearbox control, and propons; Driving engine and ISG motor are connected for coaxial, driving engine and ISG motor independence or jointly drive propons, arrange power-transfer clutch one, for engaging or interrupt the outputting power of driving engine between the output shaft and the input shaft of ISG motor of driving engine; Power-transfer clutch two is set between the output shaft and the input shaft of change speed gear box of ISG motor, for engaging or interrupting propons power.
Jackshaft power system comprises central-shaft motor, central-shaft motor controller, and is provided the jackshaft of propulsive effort by central-shaft motor.
Rear axle power system comprises rear spindle motor, rear axle electric machine controller, and is provided the back axle of propulsive effort by rear spindle motor.
Electric power supply system comprises electrokinetic cell, electrokinetic cell controller, A-battery and battery charger; By electrokinetic cell by the first inverter for ISG motor provides electric power, by the second inverter for central-shaft motor provides electric power, by the 3rd inverter for rear spindle motor provides electric power; Electrokinetic cell can also be powered by external equipment, and is that A-battery is powered by DC/DC, and battery charger is power battery charging by external source.
The mode of operation arranging system comprises:
4 wheel driven electric-only mode: jointly driven by central-shaft motor and rear spindle motor; Power-transfer clutch one disconnects, and power-transfer clutch two disconnects, and jackshaft power system engages, rear axle power system engages, and provide chaufeur request torque by central-shaft motor and rear spindle motor, central-shaft motor and the ratio of the Driving Torque of rear spindle motor equal the axle load ratio of axis, rear axle.
Six drive electric-only mode: jointly driven by ISG motor, central-shaft motor and rear spindle motor; Power-transfer clutch one disconnects, and power-transfer clutch two engages, and jointly provides chaufeur request torque by ISG motor and central-shaft motor, rear spindle motor, and the ratio of the Driving Torque of ISG motor, central-shaft motor and rear spindle motor equals the axle load ratio of front axle, axis, rear axle.
Six driving mixed power patterns one: jointly driven by driving engine, ISG motor, central-shaft motor and rear spindle motor; Power-transfer clutch one and power-transfer clutch two are joint, jointly provide chaufeur request torque by driving engine, ISG motor, central-shaft motor and rear spindle motor; Wherein, central-shaft motor and rear spindle motor all provide the maximum torque under current rotating speed, and extra demand torque is supplemented by propons power system; ISG motor is for regulating the rate of load condensate of driving engine, and preferential guarantee engine operation is at best fuel oil consumption district lower limit; If the maximum output torque that ISG motor output torque reaches under current rotating speed still cannot meet chaufeur request torque, then improve the Driving Torque of driving engine to meet chaufeur request torque, until the upper limit in engine output torque best fuel-economy district under reaching its current rotating speed.When six driving mixed power patterns one are lower for chaufeur request torque ratio, ensure hybrid power system fuel economy.
Six driving mixed power patterns two: jointly driven by driving engine, ISG motor, central-shaft motor and rear spindle motor; Power-transfer clutch one and power-transfer clutch two are joint, jointly provide chaufeur request torque by driving engine, ISG motor, central-shaft motor, rear spindle motor; Preferential guarantee engine operation is in the upper limit in best fuel-economy district, ISG motor is for adjusting the rate of load condensate of driving engine, extra torque is supplemented jointly by central-shaft motor and rear spindle motor, and the ratio of the Driving Torque of central-shaft motor, rear spindle motor equals the axle load ratio of axis and rear axle; When ISG motor output torque reaches the maximum output torque under current rotating speed but still cannot meet chaufeur request torque, improve the Driving Torque of driving engine to meet chaufeur request torque, until engine output torque reaches the maximum output torque under its current rotating speed.When six driving mixed power patterns two are higher for chaufeur request torque ratio, ensure the dynamic property of hybrid power system.
No matter six driving mixed power systems are in pattern one or pattern two times in the present embodiment, driving engine can on the preferential basis using electric energy, according to the chaufeur request torque of reality, progressively improve the Driving Torque of driving engine, the basis ensureing hybrid power system economy ensures its dynamic property.
Tandem drive pattern one: by driven by engine ISG electric power generation, is driven jointly by central-shaft motor and rear spindle motor; Power-transfer clutch one engages, and power-transfer clutch two disconnects, and jointly provides chaufeur request torque by central-shaft motor, rear spindle motor, and the ratio of motor output torque equals the axle load ratio of axis, rear axle; Smaller value between the maximum charge torque that under the lower limit torque that engine output torque is its best fuel-economy district and current rotating speed, ISG motor can send, by driven by engine ISG electric power generation, the electric energy sent provides electric energy for giving central-shaft motor and rear spindle motor, and part more than needed is used for power battery charging.
Tandem drive pattern two: power-transfer clutch one engages, power-transfer clutch two disconnects, and jointly provides chaufeur request torque by central-shaft motor, rear spindle motor, and the ratio of motor output torque equals the axle load ratio of axis and rear axle; Smaller value between the maximum charge torque that under the upper limit torque that engine output torque is its best fuel-economy district and current rotating speed, ISG motor can send, by driven by engine ISG electric power generation, the electric energy sent provides electric energy for giving central-shaft motor and rear spindle motor, and part more than needed is used for power battery charging.
In prior art, the series model of hybrid power system is usually only with a kind of, be adopt power follower type control method or driving engine to be operated in control method on several different discrete point when different demand, but this existing control method can not the operation point of effective guarantee driving engine be all optimum.Power is adopted to follow the mode combined with discrete point work in the present embodiment, driving engine is allowed to be operated on two different preferably working curves when different demands, the i.e. lower limit in best fuel-economy district and the upper limit in best fuel-economy district, the operation point of driving engine when this kind of method of work has effectively taken into account different capacity demand, and the operation point of driving engine during often kind of demand can consecutive variations, fuel economy during effective guarantee driven by engine ISG electric power generation.
Engine drive mode: driven separately by driving engine; Power-transfer clutch one and power-transfer clutch two are joint, and driving engine exports the maximum torque under current rotating speed, and torque more than needed is power battery charging for driving ISG motor.
Failure mode: if propons power system lost efficacy, then perform 4 wheel driven electric-only mode; If jackshaft power system lost efficacy, then by propons power system and the system combined driving of rear axle power, engine operation was in best fuel oil consumption district, and ISG motor is for adjusting engine load rate, and extra torque is provided by rear spindle motor; If rear axle power thrashing, then combine driving by propons power system and jackshaft power system, engine operation is in best fuel oil consumption district, and ISG motor is for adjusting engine load rate, and extra torque is provided by central-shaft motor; If electric power supply system lost efficacy, then performed engine drive mode; If there are two inefficacies in power system, then drive by one that is left; For other situation of failure mode, system gives a warning and stops.
In addition, drive in electric-only mode, tandem drive pattern one and tandem drive pattern two at 4 wheel driven electric-only mode, six, the axle load that setting central-shaft motor and the ratio of the Driving Torque of rear spindle motor equal axis and rear axle is than ensureing adhesion coefficient utilization when driving by actv., ensure the crossing ability of hybrid power system, avoid hybrid power system to skid when low attachment road surface and the waste of driving torque.
In the present embodiment, six driving mixed power systems are when performing automatic mode, first one or more cisco unity malfunction whether is had in the propons power system of the section of sentencing hybrid power system, jackshaft power system, rear axle power system and electric power supply system, if, perform failure mode, if not, other mode of operations of described hybrid power system are automatically performed according to the following rules:
If electrokinetic cell SOC is high, and chaufeur request torque is little, perform 4 wheel driven electric-only mode.
If electrokinetic cell SOC is high, and during chaufeur request torque is, performs six and drive electric-only mode.
If electrokinetic cell SOC is high, and chaufeur request torque is large, performs six driving mixed power patterns one.
If during electrokinetic cell SOC is, and chaufeur request torque is little, perform tandem drive pattern one.
If during electrokinetic cell SOC is, and chaufeur request torque be in or large, perform six driving mixed power patterns two.
If electrokinetic cell SOC is low, and chaufeur request torque is little, performs tandem drive pattern two.
If electrokinetic cell SOC is low, and chaufeur request torque be in or large, perform the independent drive pattern of driving engine;
Arranging manual switchover module in the present embodiment for directly switching hybrid power system mode of operation is electric-only mode or for hybrid mode.
In electric-only mode, be automatically chosen as 4 wheel driven electric-only mode or six according to the following rules and drive electric-only mode: if electrokinetic cell SOC is for high, and chaufeur request torque is little, performs 4 wheel driven electric-only mode; If electrokinetic cell SOC is high, chaufeur request torque performs six and drives electric-only mode in being; If chaufeur request torque is large, system gives a warning and automatically performs six and drives electric-only mode.
In other situations, chaufeur manual switchover is that electric-only mode is invalid, and system keeps original running state.
In hybrid mode, automatically select six driving mixed power pattern one or six driving mixed power patterns two according to the following rules: if electrokinetic cell SOC is for high, and chaufeur request torque is large, performs six driving mixed power patterns one; If during electrokinetic cell SOC is, and chaufeur request torque be in or large, perform six driving mixed power patterns two.
In other situations, chaufeur manual switchover is that hybrid mode is invalid, and system keeps original running state.
When hybrid power system relate to switch between driving engine start and stop and the mode of operation not relating to driving engine start and stop time, larger fluctuation or interruption is produced for avoiding power system Driving Torque, the Driving Torque sum arranging axis and rear axle is the difference that chaufeur request torque deducts the actual Driving Torque of front axle, and central-shaft motor and the ratio of the Driving Torque of rear spindle motor equal the axle load ratio of axis and rear axle.
Define in the present embodiment:
Electrokinetic cell SOC is that height refers to that electrokinetic cell SOC is greater than its expected value SOC
obj; Electrokinetic cell SOC refers in being that electrokinetic cell SOC is between its expected value SOC
objwith the low value SOC of setting
lowbetween; Electrokinetic cell SOC is the low low value SOC that electrokinetic cell SOC value is less than setting that refers to
lowtime.
Chaufeur request torque refers to for little the maximum torque sum that chaufeur request torque is less than central-shaft motor and rear spindle motor and can provides; Chaufeur request torque in refer to the maximum torque sum that chaufeur request torque is not less than central-shaft motor and rear spindle motor and can provides, and be less than or equal to ISG motor, maximum torque sum that central-shaft motor, rear spindle motor can provide; Chaufeur request torque is for referring to greatly the maximum torque sum that chaufeur request torque is greater than ISG motor, central-shaft motor and rear spindle motor and can provides.
To Figure 1 shows that in the present embodiment that six drive six driving mixed power system schematic, it remains the starter that conventional engines carries, and starter is assemblied on driving engine, start the engine time low for electric charge; Because planetary wheel coupling device system is too complicated, system difficulty is larger, and for making system layout compacter, selects the coupled modes that driving engine is connected with ISG motor coaxle in the present embodiment.
Under automatic mode, for ensureing dynamic property and the crossing ability of hybrid power system, jackshaft and back axle are in negative load condition simultaneously or are in without driving condition simultaneously.Electrokinetic cell is connected with ISG motor, central-shaft motor, rear spindle motor with inverter three, for providing electric power for three motors respectively by inverter one, inverter two; Electrokinetic cell is that A-battery is powered by DC-DC; The present embodiment medium power battery connects external power charging by battery charger or the electric power being stored in electrokinetic cell is flowed to external equipment; By arranging external power taking unit in the present embodiment, when stopping, if desired for external equipment is powered, can utilize driven by engine ISG electric power generation, external consumer obtains electric energy by power taking unit.Engine power adjustment module is set, when driven by engine ISG electric power generation, can according to the actual requirements, the generated output needed for manual regulation.For reducing the error that traditional driving engine dynamic torque is estimated to cause, avoid driving engine dynamic torque to estimate to there is calculation of complex, be difficult to realize controlling in real time and the problem chosen of evaluated error dependence design accuracy, at propons output shaft, torque sensor is set, for measuring the Driving Torque of front axle in real time, to reach the object of power system shock extent when reduction pattern switches.
Figure 2 shows that the automatic mode control block diagram of six driving mixed power systems in the present embodiment, when performing automatic mode, first need to judge whether system lost efficacy, and then judge the scope of electrokinetic cell SOC and the scope of chaufeur request torque.
Chaufeur request torque calculation is usual manner, embodied by the action of chaufeur stepping on accelerator pedal, namely be multiplied by according to the aperture of acceleration pedal the maximum torque sum that each power system under current rotating speed can provide, or introduce a torque modification coefficient on this basis, this coefficient of correction can be obtained by a fuzzy controller, the aperture being input as acceleration pedal of this fuzzy controller and rate of change thereof.The request torque calculated above by acceleration pedal aperture is multiplied by chaufeur actual request torque for this reason coefficient of correction, for embodying the urgency level that chaufeur accelerates.
Figure 3 shows that system manual mode control block diagram in this implementation column.Select suitable mode of operation for convenience of chaufeur according to the subjective judgement of oneself, manual switchover module is set, can according to the selection of chaufeur, the mode of operation of hybrid power system can be directly switch into electric-only mode and hybrid mode.In addition, during chaufeur manual switchover, the requirement that pattern that is switched to of meet requirements is not corresponding of current service conditions, system judges that manual switchover is invalid, continues to maintain original mode of operation and runs.
Claims (6)
1. six driving mixed power systems, is characterized in that: described hybrid power system comprises propons power system, jackshaft power system, rear axle power system and electric power supply system;
Described propons power system comprises driving engine and engine controller, starter for fire an engine, ISG motor and ISG electric machine controller, change speed gear box and gearbox control, and propons; Described driving engine is connected for coaxial with described ISG motor, described driving engine and described ISG motor are independent or jointly drive propons, power-transfer clutch one is set between the output shaft and the input shaft of ISG motor of described driving engine, for engaging or interrupt the outputting power of driving engine; Power-transfer clutch two is set between the output shaft and the input shaft of change speed gear box of described ISG motor, for engaging or interrupting propons power;
Described jackshaft power system comprises central-shaft motor, central-shaft motor controller, and is provided the jackshaft of propulsive effort by central-shaft motor;
Described rear axle power system comprises rear spindle motor, rear axle electric machine controller, and is provided the back axle of propulsive effort by rear spindle motor;
Described electric power supply system comprises electrokinetic cell, electrokinetic cell controller, A-battery, battery charger, inverter one, inverter two and inverter three; Described electrokinetic cell by the first inverter for ISG motor provides electric power, by the second inverter for central-shaft motor provides electric power, by the 3rd inverter for rear spindle motor provides electric power; Described electrokinetic cell can also be powered for external equipment, and is that described A-battery is powered by DC/DC, and described battery charger is power battery charging by external source.
2. six driving mixed power systems according to claim 1, is characterized in that: the mode of operation arranging described system comprises:
4 wheel driven electric-only mode: jointly driven by described central-shaft motor and rear spindle motor; Power-transfer clutch one disconnects, and power-transfer clutch two disconnects, and jackshaft power system engages, rear axle power system engages, and provide chaufeur request torque by central-shaft motor and rear spindle motor, central-shaft motor and the ratio of the Driving Torque of rear spindle motor equal the axle load ratio of axis, rear axle;
Six drive electric-only mode: jointly driven by described ISG motor, central-shaft motor and rear spindle motor; Power-transfer clutch one disconnects, and power-transfer clutch two engages, and jointly provides chaufeur request torque by ISG motor and central-shaft motor, rear spindle motor, and the ratio of the Driving Torque of described ISG motor, central-shaft motor and rear spindle motor equals the axle load ratio of front axle, axis, rear axle;
Six driving mixed power patterns one: jointly driven by described driving engine, ISG motor, central-shaft motor and rear spindle motor; Power-transfer clutch one and power-transfer clutch two are joint, jointly provide chaufeur request torque by driving engine, ISG motor, central-shaft motor and rear spindle motor; Wherein, central-shaft motor and rear spindle motor all provide the maximum torque under current rotating speed, and extra demand torque is supplemented by propons power system; ISG motor is for regulating the rate of load condensate of driving engine, and preferential guarantee engine operation is at best fuel oil consumption district lower limit; If the maximum output torque that ISG motor output torque reaches under current rotating speed still cannot meet chaufeur request torque, then improve the Driving Torque of driving engine to meet chaufeur request torque, until the upper limit in engine output torque best fuel-economy district under reaching its current rotating speed;
Six driving mixed power patterns two: jointly driven by described driving engine, ISG motor, central-shaft motor and rear spindle motor; Power-transfer clutch one and power-transfer clutch two are joint, jointly provide chaufeur request torque by driving engine, ISG motor, central-shaft motor, rear spindle motor; Preferential guarantee engine operation is in the upper limit in best fuel-economy district, ISG motor is for adjusting the rate of load condensate of driving engine, extra torque is supplemented jointly by central-shaft motor and rear spindle motor, and the ratio of the Driving Torque of central-shaft motor, rear spindle motor equals the axle load ratio of axis and rear axle; When ISG motor output torque reaches the maximum output torque under current rotating speed but still cannot meet chaufeur request torque, improve the Driving Torque of driving engine to meet chaufeur request torque, until engine output torque reaches the maximum output torque under its current rotating speed;
Tandem drive pattern one: by ISG electric power generation described in described driven by engine, is driven jointly by described central-shaft motor and rear spindle motor; Power-transfer clutch one engages, and power-transfer clutch two disconnects, and jointly provides chaufeur request torque by central-shaft motor, rear spindle motor, and the ratio of motor output torque equals the axle load ratio of axis, rear axle; Smaller value between the maximum charge torque that under the lower limit torque that engine output torque is its best fuel-economy district and current rotating speed, ISG motor can send, by driven by engine ISG electric power generation, the electric energy sent provides electric energy for giving central-shaft motor and rear spindle motor, and part more than needed is used for power battery charging;
Tandem drive pattern two: power-transfer clutch one engages, power-transfer clutch two disconnects, and jointly provides chaufeur request torque by central-shaft motor, rear spindle motor, and the ratio of motor output torque equals the axle load ratio of axis and rear axle; Smaller value between the maximum charge torque that under the upper limit torque that engine output torque is its best fuel-economy district and current rotating speed, ISG motor can send, by driven by engine ISG electric power generation, the electric energy sent provides electric energy for giving central-shaft motor and rear spindle motor, and part more than needed is used for power battery charging;
Engine drive mode: driven separately by described driving engine; Power-transfer clutch one and power-transfer clutch two are joint, and driving engine exports the maximum torque under current rotating speed, and torque more than needed is power battery charging for driving ISG motor;
Failure mode: if propons power system lost efficacy, then perform 4 wheel driven electric-only mode; If jackshaft power system lost efficacy, then by propons power system and the system combined driving of rear axle power, engine operation was in best fuel oil consumption district, and ISG motor is for adjusting engine load rate, and extra torque is provided by rear spindle motor; If rear axle power thrashing, then combine driving by propons power system and jackshaft power system, engine operation is in best fuel oil consumption district, and ISG motor is for adjusting engine load rate, and extra torque is provided by central-shaft motor; If electric power supply system lost efficacy, then performed engine drive mode; If there are two inefficacies in power system, then drive by one that is left; For other situation of failure mode, system gives a warning and stops.
3. the control method of six driving mixed power systems described in a claim 2, it is characterized in that: first whether have one or more cisco unity malfunction in the propons power system of the section of sentencing hybrid power system, jackshaft power system, rear axle power system and electric power supply system, if, perform failure mode, if not, other mode of operations of described hybrid power system are automatically performed according to the following rules:
If electrokinetic cell SOC is high, and chaufeur request torque is little, perform 4 wheel driven electric-only mode;
If electrokinetic cell SOC is high, and during chaufeur request torque is, performs six and drive electric-only mode;
If electrokinetic cell SOC is high, and chaufeur request torque is large, performs six driving mixed power patterns one;
If during electrokinetic cell SOC is, and chaufeur request torque is little, perform tandem drive pattern one;
If during electrokinetic cell SOC is, and chaufeur request torque be in or large, perform six driving mixed power patterns two;
If electrokinetic cell SOC is low, and chaufeur request torque is little, performs tandem drive pattern two;
If electrokinetic cell SOC is low, and chaufeur request torque be in or large, perform the independent drive pattern of driving engine.
4. the control method of six driving mixed power systems according to claim 3, is characterized in that arranging manual switchover module, and described manual switchover module is electric-only mode for the described hybrid power system of direct switching or is hybrid mode;
In described electric-only mode, be automatically chosen as 4 wheel driven electric-only mode or six according to the following rules and drive electric-only mode: if electrokinetic cell SOC is for high, and chaufeur request torque is little, performs 4 wheel driven electric-only mode; If electrokinetic cell SOC is high, chaufeur request torque performs six and drives electric-only mode in being; If chaufeur request torque is large, system gives a warning and automatically performs six and drives electric-only mode; In other situations, chaufeur manual switchover is that hybrid mode is invalid, and system keeps original running state;
In described hybrid mode, automatically select six driving mixed power pattern one or six driving mixed power patterns two according to the following rules: if electrokinetic cell SOC is for high, and chaufeur request torque is large, performs six driving mixed power patterns one; If during electrokinetic cell SOC is, and chaufeur request torque be in or large, perform six driving mixed power patterns two; In other situations, chaufeur manual switchover is that hybrid mode is invalid, and system keeps original running state.
5. the control method of six driving mixed power systems according to claim 3 or 4, it is characterized in that: when described hybrid power system relate to switch between driving engine start and stop and the mode of operation not relating to driving engine start and stop time, larger fluctuation or interruption is produced for avoiding power system Driving Torque, the Driving Torque sum arranging axis and rear axle is the difference that chaufeur request torque deducts the actual Driving Torque of front axle, and central-shaft motor and the ratio of the Driving Torque of rear spindle motor equal the axle load ratio of axis and rear axle.
6. the control method of six driving mixed power systems according to claim 3, is characterized in that:
Described electrokinetic cell SOC is that height refers to that electrokinetic cell SOC is greater than its expected value SOC
obj;
Described electrokinetic cell SOC refers in being that electrokinetic cell SOC is between its expected value SOC
objwith the low value SOC of setting
lowbetween;
Described electrokinetic cell SOC is the low low value SOC that electrokinetic cell SOC value is less than setting that refers to
lowtime;
Described chaufeur request torque refers to for little the maximum torque sum that chaufeur request torque is less than central-shaft motor and rear spindle motor and can provides;
Described chaufeur request torque in refer to the maximum torque sum that chaufeur request torque is not less than central-shaft motor and rear spindle motor and can provides, and be less than or equal to ISG motor, maximum torque sum that central-shaft motor, rear spindle motor can provide;
Described chaufeur request torque is for referring to greatly the maximum torque sum that chaufeur request torque is greater than ISG motor, central-shaft motor and rear spindle motor and can provides.
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| CN109050519A (en) * | 2018-08-24 | 2018-12-21 | 中车青岛四方车辆研究所有限公司 | Vehicle hybrid system, vehicle and control method |
| CN110126643B (en) * | 2019-04-26 | 2021-02-02 | 北京理工大学 | Control method and system for distributed driving electric automobile in motor failure state |
| CN111267600B (en) * | 2020-03-04 | 2021-02-09 | 中国矿业大学 | Multi-power coupling timely full-drive system of heavy transport vehicle and control method |
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Also Published As
| Publication number | Publication date |
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| CN106740053A (en) | 2017-05-31 |
| CN104553740B (en) | 2017-01-25 |
| CN106740053B (en) | 2018-10-02 |
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