CN101691118B - Motor-assistant driving mode control method of hybrid electric vehicle - Google Patents
Motor-assistant driving mode control method of hybrid electric vehicle Download PDFInfo
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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
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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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
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells
Abstract
The invention relates to a motor-assistant driving mode control method of a hybrid electric vehicle, comprising the following steps: (1) if the vehicle is in an idle state, a hybrid control unit HCU judges whether the condition for the vehicle to enter a motor-assistant driving mode from the idle state is available or not in real time; if yes, the motor outputs an assistant torque for starting and preventing the motor from shutting down, otherwise, the motor returns to real-time judgement; (2) if the vehicle is in the driving process, the hybrid control unit HCU judges whether the condition for the vehicle to enter the motor-assistant driving mode from the driving state is available or not in real time; if yes, the motor outputs the assistant torque for speeding up and climbing, otherwise, the motor returns to real-time judgement. The control method judges the finished automobile state by the hybrid control unit HCU so as to judge whether the vehicle enters the motor-assistant driving mode or not and output corresponding assistant torque. The invention has stable conversion and improves driving comfortableness and driving performance.
Description
Technical field
The present invention relates to a kind of motor assist drive pattern control method of hybrid vehicle.
Background technology
Hybrid vehicle becomes electric energy by motor by kinetic transformation, stores in the closed-center systems such as power accumulator; Under the operating modes such as vehicle launch, acceleration, climbing, motor can utilize these electric energy to provide auxiliary driving force for vehicle, thereby improves the performance of vehicle, reduces oil consumption, reduces discharge.In recent years, the U.S., Europe, Japanese Ge great car company start to develop mixed motivity type automobile one after another, and following hybrid vehicle has huge development prospect.
Most hybrid power manned vehicles is all realized certain oil-saving effect by reducing engine swept volume now, but it is dead that the driving engine of small displacement is easy to suppress when starting, if again by key start the engine, can cause driving engine oil spout igniting frequently, affect oil consumption and discharge.Current hybrid power manned vehicle is mostly selected in-line hybrid drive arrangement, motor and driving engine are coaxial, the motor assist drive pattern of serial type hybrid automobile can provide starting, prevent the torque mode of engine off and the torque mode of acceleration and climbing, with the synthetic moment that drives Vehicle Driving Cycle of driving engine, motor has had such mode of operation can allow driving engine prevent from stopping working when starting, extra power can also be provided when accelerating, climbing, thereby improve the fuel economy of car load, reduce discharge.Yet, the motor assist drive pattern of serial type hybrid automobile and other patterns between while changing, because switching process is not steady, affect traveling comfort and the driving performance of car load.
Summary of the invention
The object of the present invention is to provide a kind of motor assist drive pattern control method that can guarantee to change steadily between pattern, improve the traveling comfort of driving and the hybrid vehicle of driving performance.
For achieving the above object, the present invention has adopted following technical scheme: a kind of motor assist drive pattern control method of hybrid vehicle, and the method comprises the step of following order:
(1) if car load remains static, whether the condition that hybrid controller HCU real-time judge car load enters motor assist drive pattern from quiescence is set up, and if the determination result is YES, motor is exported the auxiliary torque that starts to walk and prevent engine off; Otherwise, return to real-time judge;
(2) if car load in driving process, whether the condition that hybrid controller HCU real-time judge car load enters motor assist drive pattern from motoring condition is set up, if the determination result is YES, motor output is accelerated and the auxiliary torque of climbing; Otherwise, return to real-time judge.
As shown from the above technical solution, hybrid controller HCU of the present invention by judgement the state of car load, the rotating speed of the aperture of efp, driving engine, the state of electric clutch and the speed of a motor vehicle, thereby judge whether car load enters motor assist drive pattern, and export corresponding auxiliary torque, conversion is steady, traveling comfort and the driving performance of raising driving.Meanwhile, motor assist drive pattern can be in starting, climbing, provide moment of torsion to car load while accelerating, and the moment of torsion meeting in various situations is auxiliary, utilizes electric energy to provide auxiliary driving force for vehicle, thereby has improved the performance of vehicle, has reduced oil consumption, has reduced discharge.
Accompanying drawing explanation
Fig. 1 is mechanical connection sketch of the present invention;
Fig. 2 is electrical connection sketch of the present invention;
Fig. 3 is that vehicle enters from quiescence the workflow diagram that engine off pattern was assisted and prevented in starting;
Fig. 4 is that vehicle enters the workflow diagram that accelerates and climb auxiliary mode in the process of moving.
The specific embodiment
A kind of motor assist drive pattern control method of hybrid vehicle, the method comprises the step of following order: first, if car load remains static, whether the condition that hybrid controller HCU real-time judge car load enters motor assist drive pattern from quiescence is set up, if the determination result is YES, motor 2 is exported the auxiliary torque that starts to walk and prevent engine off; Otherwise, return to real-time judge; The second, if car load in driving process, whether the condition that hybrid controller HCU real-time judge car load enters motor assist drive pattern from motoring condition is set up, if the determination result is YES, motor 2 output is accelerated and the auxiliary torque of climbing; Otherwise, return to real-time judge, as shown in Figure 3,4, motor assist drive pattern is divided into two kinds of patterns: engine off pattern is assisted and prevented in first starting, it two is to accelerate and climbing auxiliary mode, wherein, starting is assisted and is prevented that engine off pattern is divided into again starting auxiliary mode and prevents engine off pattern.Therefore, need to distinguish judgement to the running state of vehicle.
In conjunction with Fig. 1,2, the present invention adopts the type of drive of driving engine 1 and the coaxial serial mixed power of motor 2: described motor 2 is coaxially arranged with driving engine 1, motor 2 is for driving and generating integrated motor, one end of motor 2 is connected with the bent axle of driving engine 1, the other end is connected with change speed gear box 4 by electric clutch 3, and change speed gear box 4 is connected with wheel 5 by transmission shaft 6.Described hybrid controller HCU, engine management system EMS, battery management system BMS, electric machine controller MCU are by CAN bus and Full-vehicle CAN bus network communication, electric weight one tunnel of power accumulator 7 storages exports motor 2 to through driving circuit or inverter, another road exports 12V A-battery to through DC converter DC-DC, and driving circuit or inverter, motor 2 are connected with electric machine controller MCU respectively.The CAN network of Full-vehicle CAN bus network and hybrid controller HCU and the CAN network of engine management system EMS are to belong to a CAN network, mutual by bus; Energy is from driving engine 1 output, and part is used for advancing for car load, and part exists 7 li of power accumulators for generating and recovery braking; When needs provide auxiliary torque, energy is from power accumulator 7 motor 2 of flowing through, then to drive wheel, drives vehicle to advance together with driving engine 1, under normal condition, the electricity of power accumulator 7 be used for providing car load low-voltage load and to baby battery charging use.
Below in conjunction with Fig. 1,2,3,4 the present invention is further illustrated.
In conjunction with Fig. 3, if car load remains static, whether described hybrid controller HCU first real-time judge car load meets car load assistive drive condition, if do not meet, returns to real-time judge; If meet, in the process of starting, whether the requested torque of hybrid controller HCU real-time judge chaufeur the current torque peak that can provide of driving engine 1 is provided, if the determination result is YES, the requested torque that is chaufeur is less than the torque peak that present engine 1 can provide, starting is auxiliary and prevent that the starting auxiliary mode of engine off pattern from just coming into force, otherwise returns to real-time judge, is that while accelerating for fear of chaufeur is anxious, motor 2 is also in starting auxiliary mode herein.Simultaneously, whether whether hybrid controller HCU real-time judge electric clutch 3 always too low in semi-linkage state or the real-time judge speed of a motor vehicle, if the determination result is YES, be that the too low or power-transfer clutch of the speed of a motor vehicle is in semi-linkage state always, can judge that chaufeur is certainly in starting, starting is auxiliary and prevent that engine off pattern is activated, otherwise, return to real-time judge.
In conjunction with Fig. 3, described hybrid controller HCU parses the auxiliary torque peak of starting according to current efp 8 apertures, according to the rotating speed of current driving engine 1, parse the flame-out torque peak that prevents driving engine 1 simultaneously, according to the universal curve figure of driving engine, can table look-up and draw the auxiliary torque peak of starting and prevent the torque peak that driving engine 1 is flame-out, then two moments of torsion relatively, getting large moment of torsion, to be multiplied by speed of a motor vehicle proportionality coefficient auxiliary and prevent the flame-out moment of torsion of driving engine 1 as the maximum starting that can provide when front motor 2.Described speed of a motor vehicle proportionality coefficient is: [1-(V
eL-V
tOP)/(V
tOP-V
nO)], V wherein
eLfor current vehicle speed, V
tOPfor the highest auxiliary torque speed of a motor vehicle that provides, V
nOfor the speed of a motor vehicle of auxiliary torque is not provided.Visible, the speed of a motor vehicle more approaches V
tOP, the auxiliary torque of motor 2 is just less.
In conjunction with Fig. 3, described car load assistive drive condition refers to that vehicle meets transmission system operates in non-idling mode, car load trouble free, power accumulator 7 capacity of cell SOC in conjunction with, driving engine 1 simultaneously and is not all operated at forward gear and electric clutch 3 and brake higher than certain value, gear, to meet car load assistive drive condition, judges that chaufeur has the intention of driveaway operation.The capacity of cell SOC of power accumulator 7 refers to that higher than certain value power accumulator 7 has enough electric energy, and the capacity of cell SOC of power accumulator 7 is greater than a certain threshold value, could allow to enter motor assist drive pattern.
In conjunction with Fig. 4, if car load is in driving process, whether described hybrid controller HCU real-time judge car load meets car load assistive drive condition, whether chaufeur requested torque is greater than the torque peak that present engine 1 can provide, if above-mentioned judged result is, be, car load enters acceleration and the climbing auxiliary mode of motor assist drive pattern, the auxiliary torque that motor 2 outputs are accelerated and climbed; Otherwise, return to real-time judge.Here car load assistive drive condition is with above-mentioned car load drive condition.Described hybrid controller HCU parses the torque peak of chaufeur request according to current efp 8 apertures, the torque peak that the acceleration of motor 2 outputs and climbing auxiliary torque are current driver's request deducts the torque peak that present engine 1 can provide.
In sum, the present invention by the hybrid controller HCU judgement state of car load, the rotating speed of the aperture of efp 8, driving engine 1, state and the speed of a motor vehicle of electric clutch 3, thereby judge whether car load enters motor assist drive pattern, and export corresponding auxiliary torque, conversion is steady, traveling comfort and the driving performance of raising driving.
Claims (7)
1. a motor assist drive pattern control method for hybrid vehicle, the method comprises the step of following order:
(1) if car load remains static, whether the condition that hybrid controller HCU real-time judge car load enters motor assist drive pattern from quiescence is set up, and if the determination result is YES, motor is exported the auxiliary torque that starts to walk and prevent engine off; Otherwise, return to real-time judge;
(2) if car load in driving process, whether the condition that hybrid controller HCU real-time judge car load enters motor assist drive pattern from motoring condition is set up, if the determination result is YES, motor output is accelerated and the auxiliary torque of climbing; Otherwise, return to real-time judge;
If car load remains static, whether described hybrid controller HCU first real-time judge car load meets car load assistive drive condition, if the determination result is YES, in the process of starting, whether the requested torque of hybrid controller HCU real-time judge chaufeur the current torque peak that can provide of driving engine is provided, and whether whether real-time judge electric clutch always too low in semi-linkage state or the real-time judge speed of a motor vehicle, if above-mentioned judged result is, be, it is auxiliary and prevent engine off pattern that car load enters the starting of motor assist drive pattern, motor is exported starting and is prevented the auxiliary torque of engine off, otherwise, return to real-time judge,
Described hybrid controller HCU parses maximum starting auxiliary torque according to current efp aperture, simultaneously according to current engine speed, parse the maximum engine off moment of torsion that prevents, then two moments of torsion relatively, getting large moment of torsion, to be multiplied by speed of a motor vehicle proportionality coefficient auxiliary and prevent engine off moment of torsion as the maximum starting that can provide when front motor.
2. the motor assist drive pattern control method of hybrid vehicle according to claim 1, it is characterized in that: if car load is in driving process, whether described hybrid controller HCU real-time judge car load meets car load assistive drive condition, whether chaufeur requested torque is greater than the torque peak that present engine can provide, if above-mentioned judged result is, be, car load enters acceleration and the climbing auxiliary mode of motor assist drive pattern, the auxiliary torque that motor output is accelerated and climbed; Otherwise, return to real-time judge.
3. the motor assist drive pattern control method of hybrid vehicle according to claim 1, it is characterized in that: described motor and driving engine are coaxially arranged, one end of motor is connected with engine crankshaft, the other end is connected with change speed gear box by electric clutch, and change speed gear box is connected with wheel by transmission shaft.
4. the motor assist drive pattern control method of hybrid vehicle according to claim 1, it is characterized in that: described hybrid controller HCU, engine management system EMS, battery management system BMS, electric machine controller MCU are by CAN bus and Full-vehicle CAN bus network communication, electric weight one tunnel of power accumulator storage exports motor to through driving circuit or inverter, another road exports 12V A-battery to through DC converter DC-DC, and driving circuit or inverter, motor are connected with electric machine controller MCU respectively.
5. the motor assist drive pattern control method of hybrid vehicle according to claim 1 and 2, is characterized in that: described car load assistive drive condition refers to that vehicle meets transmission system simultaneously and in conjunction with, driving engine, operates in non-idling mode, car load trouble free, power accumulator accumulator capacity SOC and be not all operated at forward gear and electric clutch and brake higher than certain value, gear.
6. the motor assist drive pattern control method of hybrid vehicle according to claim 2, it is characterized in that: described hybrid controller HCU parses the torque peak of chaufeur request according to current efp aperture, the torque peak that the acceleration of motor output and climbing auxiliary torque are current driver's request deducts the torque peak that present engine can provide.
7. the motor assist drive pattern control method of hybrid vehicle according to claim 1, is characterized in that: described speed of a motor vehicle proportionality coefficient is: [1-(V
eL-V
tOP)/(V
tOP-V
nO)], V wherein
eLfor current vehicle speed, V
tOPfor the highest auxiliary torque speed of a motor vehicle that provides, V
nOfor the speed of a motor vehicle of auxiliary torque is not provided.
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