CN102529956B - Method and system for starting hybrid electrical vehicle - Google Patents
Method and system for starting hybrid electrical vehicle Download PDFInfo
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- CN102529956B CN102529956B CN201210053555.3A CN201210053555A CN102529956B CN 102529956 B CN102529956 B CN 102529956B CN 201210053555 A CN201210053555 A CN 201210053555A CN 102529956 B CN102529956 B CN 102529956B
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Abstract
The embodiments of the invention disclose a method and a system for starting a hybrid electrical vehicle. In the method, the hybrid electrical vehicle has the following four starting modes: motor start-up, motor and engine combined start-up, engine and engine combined start-up and engine start-up. The method judges the present appropriate vehicle starting mode according to the present working condition information of the vehicle before determining the vehicle starting mode, so as to optimize the present starting performance of the vehicle. The vehicle working condition information includes transmission case input shaft torque, SOC and battery working conditions. The method and the system achieve the purpose of meeting the requirements for different vehicle starting accelerations, ensure economical efficiency of the vehicle and protect the battery.
Description
Technical field
The present invention relates to automobile start technical field, more particularly, relate to a kind of starting method and system of hybrid vehicle.
Background technology
The automobile that is equipped with at present electric-controlled type Automatic Transmission AMT (Automated Mechanical Transmission) generally all has multiple propulsions source, with under different vehicle operating mode, vehicle is carried out to corresponding power adjustment, realizes fuel economy.Be equipped with the automobile of multiple propulsions source referred to as hybrid vehicle, the common propulsion source of existing hybrid vehicle comprises the electrical motor that uses battery-powered and the driving engine that uses fuel energy supply.Fig. 1 is the structured flowchart of the parallel-connection type power driving system of a kind of hybrid vehicle in prior art, with reference to Fig. 1, this System Working Principle is specific as follows: electrical motor starts to rotate under powered battery, electrical motor drives transmission shaft to rotate by change-speed box, drive wheel, being embodied as automobile provides power; Driving engine starts to rotate under the drive of starter, by with the separating and joint of power-transfer clutch, realize to change-speed box and cutting off or transferring power, by transmission action, drive transmission shaft to rotate, drive wheel, providing of automobile power is provided; Wherein, electrical motor can be the motor with generator function, in the time that electrical motor does not provide power for automobile, can start electricity generate function, is battery savings electric energy.
Although hybrid vehicle has multiple propulsions source, but aspect the starting of hybrid vehicle, only adopting single motor starting at present, there is following defect with regard to the hybrid vehicle that has caused the single motor starting of existing employing in this: in the time of driver requested higher automobile start acceleration/accel, the electrical motor of energy is provided by battery merely, cannot realize the high-power output of moment, its starting ability providing cannot meet the requirement of higher automobile start acceleration/accel; Meanwhile, in the time that the required load of automobile start is larger, electrical motor is operated in non-efficient district, and electric energy expends greatly, and economy is not high; Meanwhile, if in the time that capacity of cell is lower, still use motor to carry out the starting of automobile, easily cause capacity of cell too low, cause battery to damage.
Secondly, prior art also has following defect: when driving engine is used for the occasion of Fraquent start, the friction of power-transfer clutch can produce amount of heat, and power-transfer clutch is in an environment that is difficult for dispelling the heat, and can make power-transfer clutch produce higher temperatures liter, thus aggravation clutch abrasion.
Summary of the invention
In view of this; the invention provides a kind of starting method and system of hybrid vehicle; the defect that adopts single motor starting to be brought to solve prior art hybrid vehicle; realize the actual conditions while starting according to hybrid vehicle; determine corresponding automobile start pattern; for hybrid vehicle provides suitable starting ability, guarantee vehicle economy and the protection to battery.
For achieving the above object, the invention provides following technical scheme:
A starting method for hybrid vehicle, comprising:
A. obtain the brake pedal aperture signal of hybrid vehicle, calculate corresponding brake pedal aperture rate of change, acceleration/accel while determining hybrid vehicle starting according to described brake pedal aperture rate of change, the acceleration/accel during according to described starting is determined change speed gear box input shaft torque;
Whether the driving engine that B. judges described hybrid vehicle adopts starter mode to light a fire, and if so, performs step F, if not, performs step C;
C. judge that whether current battery charge state SOC is in normal range, and judge whether current battery normally works, if the result of these two judgements is is, performs step D, otherwise, execution step F;
D. judge whether current electrical motor torque peak is greater than described change speed gear box input shaft torque, if so, determine that the originate mode of hybrid vehicle is motor starting, if not, perform step E;
E. judge that whether current SOC is in normal range, judge whether current battery normally works, and judge present engine torque peak and current electrical motor torque peak and, whether be greater than described change speed gear box input shaft torque, if the result of these three judgements is be, the originate mode of determining hybrid vehicle is that driving engine and electrical motor start jointly, otherwise, execution step F;
F. judge whether current battery can charge, and judge whether maximum power is greater than, hybrid vehicle starting power demand and the required charge power of battery with, if these two judged results are be, the originate mode of determining hybrid vehicle is that driving engine and electrical generator start jointly, otherwise, execution step G;
G. judge whether maximum engine torque is greater than described change speed gear box input shaft torque, if so, determine that the originate mode of hybrid vehicle is engine starting, if not, start vehicle launch exception handling.
The present invention also provides a kind of start system of hybrid vehicle, comprising:
Parameter acquisition module, for obtaining the brake pedal aperture signal of hybrid vehicle;
Computing module, for the brake pedal aperture signal obtaining according to described parameter acquisition module, calculate corresponding brake pedal aperture rate of change, acceleration/accel while determining hybrid vehicle starting according to described brake pedal aperture rate of change, the acceleration/accel during according to described starting is determined change speed gear box input shaft torque;
The first judge module, for judging whether the driving engine of described hybrid vehicle adopts starter mode to light a fire;
The second judge module, in the judged result of described the first judge module be no, judge that whether current SOC is in normal range, and judge whether current battery normally works;
The 3rd judge module, for being in two judged results of described the second judge module and being, judges whether current electrical motor torque peak is greater than described change speed gear box input shaft torque;
The 4th judge module, for in the case of the judged result of described the 3rd judge module be no, judge that whether current SOC is in normal range, judge whether current battery normally works, and judge present engine torque peak and current electrical motor torque peak and, whether be greater than described change speed gear box input shaft torque;
The 5th judge module, being used for is yes in the judged result of described the first judge module, or, arbitrary judged result of described the second judge module is no, or arbitrary judged result of described the 4th judge module is, in no situation, to judge whether current battery can charge, and judge whether maximum power is greater than, hybrid vehicle starting power demand and the required charge power of battery with;
The 6th judge module, for being in no situation in arbitrary judged result of described the 5th judge module, judges whether maximum engine torque is greater than described change speed gear box input shaft torque;
Starting determination module, for in the case of the judged result of described the 3rd judge module be, the originate mode of determining hybrid vehicle is motor starting, or, in the case of three judged results of described the 4th judge module are and are, the originate mode of determining hybrid vehicle is that driving engine and electrical motor start jointly, or, in the case of two judged results of described the 5th judge module are and are, the originate mode of determining hybrid vehicle is that driving engine and electrical generator start jointly, or, in the case of the judged result of described the 6th judge module be, the originate mode of determining hybrid vehicle is engine starting, or, in the case of the judged result of described the 6th judge module be no, start vehicle launch exception handling.
Based on above technical scheme, in the starting method of the hybrid vehicle providing in the embodiment of the present invention, the originate mode of hybrid vehicle is divided into four kinds: motor starting, and driving engine and electrical motor start jointly, driving engine and electrical generator start jointly, engine starting; Described method, before definite automobile start pattern, all, first according to the work information of current automobile, judges current suitable automobile start pattern, to realize the starting ability of the current the best of automobile; Described vehicle behavior information has comprised change speed gear box input shaft torque, SOC, and battery operating mode, thus realize the requirement of satisfied different automobile start acceleration/accels, guarantee vehicle economy and the protection to battery.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the structured flowchart of the parallel-connection type power driving system of a kind of hybrid vehicle in prior art;
Fig. 2 is the starting method diagram of circuit of a kind of hybrid vehicle of the present invention;
Fig. 3 is another diagram of circuit of the starting method of a kind of hybrid vehicle of the present invention;
Fig. 4 is another diagram of circuit again of the starting method of a kind of hybrid vehicle of the present invention;
Fig. 5 is the method flow diagram that the present invention predicts power-transfer clutch junction temperature;
Fig. 6 be the present invention carry out power-transfer clutch predicted temperature transfinite process method flow diagram;
Fig. 7 is the structured flowchart of the start system of a kind of hybrid vehicle of the present invention;
Fig. 8 is another structured flowchart of the start system of a kind of hybrid vehicle of the present invention;
Fig. 9 is the structured flowchart of invention power-transfer clutch junction temperature prediction module;
Figure 10 is the structured flowchart of bright processing module.
Detailed description of the invention
The embodiment of the present invention aims to provide a kind of starting method and system of hybrid vehicle; actual conditions while starting according to hybrid vehicle to realize; determine corresponding automobile start pattern, for hybrid vehicle provides suitable starting ability, guarantee vehicle economy and the protection to battery.The embodiment of the present invention is only for the hybrid vehicle with parallel-connection type power driving system.In embodiments of the present invention, the originate mode of hybrid vehicle is divided into four kinds, comprising: electrical motor starts separately, and driving engine and electrical motor start jointly, and driving engine and electrical generator start jointly, and driving engine starts separately.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 2 is the starting method diagram of circuit of a kind of hybrid vehicle of the present invention.Can comprise with reference to Fig. 2 the method:
Step S100, obtain the brake pedal aperture signal of hybrid vehicle, calculate corresponding brake pedal aperture rate of change, acceleration/accel while determining hybrid vehicle starting according to described brake pedal aperture rate of change, the acceleration/accel during according to described starting is determined change speed gear box input shaft torque;
Wherein, obtaining of brake pedal aperture signal can obtain by vehicle body CAN bus.
Step S200, judge whether the driving engine of described hybrid vehicle adopts starter mode to light a fire, and if so, performs step S600, if not, performs step S300;
In the present invention when automobile is lighted a fire for the first time or when cold start, the sparking mode of driving engine all adopts starter mode to light a fire, otherwise driving engine adopts start-stop mode igniting.
Step S300, judge that whether current battery charge state SOC is in normal range, and judge whether current battery normally works, if the result of these two judgements is is, performs step S400, otherwise, execution step S600;
Wherein, judge that whether current battery charge state SOC (State Of Charge) is in normal range, its object is to judge that can automobile be current enter direct motor drive state, if SOC is in normal range, represent to enter direct motor drive state, otherwise, need to use driving engine to drive.
Wherein, judge that whether battery is working properly, can be the follow-up battery-powered that whether adopts foundation is provided, to realize the reasonable utilization to battery, realize electric energy maximum using and the protection to battery.
Step S400, judge whether current electrical motor torque peak is greater than described change speed gear box input shaft torque, if so, determine that the originate mode of hybrid vehicle is motor starting, if not, perform step S500;
Normal by judging SOC scope, battery operated normal, and current electrical motor torque peak Temax is greater than described change speed gear box input shaft torque T1, can determine that the suitable employing motor starting of current vehicle behavior is as originate mode.
Step S500, judge that whether current SOC is in normal range, judge whether current battery normally works, and judge present engine torque peak and current electrical motor torque peak and, whether be greater than described change speed gear box input shaft torque, if the result of these three judgements is be, the originate mode of determining hybrid vehicle is that driving engine and electrical motor start jointly, otherwise, execution step S600.
Step S600, judge whether current battery can charge, and judge whether maximum power is greater than, hybrid vehicle starting power demand and the required charge power of battery with, if these two judged results are be, the originate mode of determining hybrid vehicle is that driving engine and electrical generator start jointly, otherwise, execution step S700;
When the power of driving engine reaches automobile start power demand and the required charge power sum of battery, and battery is can charge time, now adopts the common starting of driving engine and electrical generator can realize the maximization of automobile starting performance.
Step S700, judge whether maximum engine torque is greater than described change speed gear box input shaft torque, if so, determine that the originate mode of hybrid vehicle is engine starting, if not, start vehicle launch exception handling;
Vehicle launch exception handling can, with reference to prior art, specifically can drive according to limping function or with change speed gear box, motor, the engine configurations of fixing, and no longer accepts the acceleration pedal position signal of chaufeur.
If in the judgement of step S600, adopt electrical generator battery is charged and be not suitable for current vehicle working condition, meet change speed gear box required input power at engine output, can realize in the situation of driving automobile starting, this situation specifically can show as maximum engine torque and whether be greater than described change speed gear box input shaft torque, adopts driving engine to start separately the originate mode as automobile; Vehicle launch exception handling can, with reference to prior art, repeat no more herein.
The starting method of the hybrid vehicle that the embodiment of the present invention provides, before definite automobile start pattern, all, first according to the work information of current automobile, judges current suitable automobile start pattern, to realize the starting ability of the current the best of automobile; Described vehicle behavior information has comprised change speed gear box input shaft torque, SOC, and battery operating mode, thus realize the requirement of satisfied different automobile start acceleration/accels, guarantee vehicle economy and the protection to battery.
Another diagram of circuit of the starting method of a kind of hybrid vehicle of Fig. 3 the present invention.Show method in conjunction with Fig. 2 Fig. 3, Fig. 3 shows that method also comprises:
Step S810, after determining that the originate mode of hybrid vehicle is motor starting, control corresponding motor torque;
The corresponding motor torque of described control can be according to the position output torque of the brake pedal obtaining or acceleration pedal;
Step S820, determining that the originate mode of hybrid vehicle is, after driving engine starts jointly with electrical motor, to control corresponding motor torque and engine torque;
Step S830, determining that the originate mode of hybrid vehicle is, after driving engine starts jointly with electrical generator, to control corresponding generator torque, juxtaposition 1stStart=0, controls corresponding engine torque;
Wherein, 1stStart=0 represents that driving engine has carried out first start, does not need again for driving engine is selected originate mode;
Step S840, after determining that the originate mode of hybrid vehicle is engine starting, put 1stStart=0, control engine moment of torsion.
Method shown in Fig. 3, determining after the originate mode of automobile, is carried out after automobile start according to definite originate mode, can carry out corresponding moment of torsion control, can realize more pulsation-free driving of automobile, keeps automobile in best dynamic regime.
Another diagram of circuit again of the starting method of a kind of hybrid vehicle of Fig. 4 the present invention.In conjunction with method shown in Fig. 3 and Fig. 4, method shown in Fig. 4 also comprised before step S820, step S830 and step S840:
Step S910, prediction power-transfer clutch junction temperature;
The concrete grammar of prediction power-transfer clutch junction temperature can, with reference to Fig. 5, comprise:
Step S911, the default power-transfer clutch junction temperature estimation model of basis, estimate current power-transfer clutch junction temperature;
Wherein, the generating mode of default power-transfer clutch junction temperature estimation model can be specially: according to given shock extent J, the engaging speed of setpoint clutch friction lining, under the condition of different engine torque Te and clutch transmission torque Tc, on experimental stand, carry out power-transfer clutch and engage experiment, after in experiment, power-transfer clutch engages and separates at every turn, measure and record ambient temperature, engine-cooling system temperature, platen temperature, the temperature of friction lining specified point etc., determine clutch temp estimation model under current engaging speed by these experiment parameters and experimental result, described clutch temp estimation model can be the characteristic curve that comprises current engaging speed and clutch temp corresponding relation, by default power-transfer clutch junction temperature estimation model, in conjunction with current vehicle behavior, can estimate current power-transfer clutch junction temperature Temp0.
Step S912, according to described change speed gear box input shaft torque, present engine rotating speed, the speed of a motor vehicle, shock extent calculates clutch engagement and engagement time, thereby prediction unit friction work, calculates the temperature rise of power-transfer clutch in certain engagement time according to described unit friction work, according to ambient temperature, engine-cooling system temperature and friction lining radiating rate, calculate the temperature drop of power-transfer clutch in described certain binding time;
Wherein, engine speed We, vehicle velocity V v, can obtain by vehicle body CAN bus; Described prediction work due to friction W can draw by formula W=Tc* α, and α represents current relative sliding corner; Described temperature rise Δ T+ can draw by formula Δ T+=W/ (c*m), and c represents clutch segment material specific heat capacity, and m represents clutch segment quality; Described temperature drop Δ T_ can draw by formula Δ T_=η W/ (c*m), and η represents heat extraction coefficient;
Between step S911 and step S912, significantly order is not distinguished.
The power-transfer clutch junction temperature of step S913, described current estimation adds the above temperature rise and deducts described temperature drop, obtains described power-transfer clutch junction temperature predictor.
Step S920, judge whether power-transfer clutch junction temperature predictor exceedes predetermined threshold, if so, carry out the processing of transfiniting of power-transfer clutch predicted temperature, if not, carry out power-transfer clutch Engagement Control;
Wherein, described execution power-transfer clutch Engagement Control can engage by predetermined clutch engagement curve, described execution power-transfer clutch predicted temperature transfinite process concrete grammar can, with reference to Fig. 6, comprise:
If exceeding the number of times of predetermined threshold, step S921 power-transfer clutch junction temperature predictor reaches predetermined warning degree, acceleration/accel and set clutch engagement engaging clutch during by described hybrid vehicle starting;
Wherein, set clutch engagement can obtain by described predetermined clutch engagement curve, and this engaging speed curve table is shown with power-transfer clutch corresponding engaging speed in the time that difference engages period.
If exceeding the number of times of predetermined threshold, step S922 power-transfer clutch junction temperature predictor reaches the predetermined degree that need to take measures to reduce temperature rise, improve clutch engagement, reduce unit friction work, or, acceleration/accel while reducing hybrid vehicle starting, determine now required torque, according to described definite now required torque, again on driving engine and electrical motor, carry out torque distribution;
Wherein, improve clutch engagement and contribute to reduce the front needed relative sliding corner of power-transfer clutch joint, thereby reduce work due to friction; Acceleration/accel while reducing automobile start contributes to reduce the moment of torsion that power-transfer clutch need to transmit, and then reduces work due to friction.
If it is too much that step S923 power-transfer clutch junction temperature predictor exceedes the number of times of predetermined threshold, reach the predetermined degree that cannot ensure the normal work of power-transfer clutch, cut-off clutch to protect clutch-lining, starts vehicle launch exception handling simultaneously;
Wherein, described predetermined warning degree, described predetermined needs take measures to reduce the degree of temperature rise, and the described predetermined degree that cannot ensure the normal work of power-transfer clutch all can be carried out respective settings according to actual conditions.
It should be noted that, step S921, step S922 and step S923 are the processing mode that transfinites under different situations, do not have order problem successively between each step.
The embodiment of the present invention has not only realized the optimum start performance of current automobile; also by estimating and forecasting power-transfer clutch junction temperature; and in the time that power-transfer clutch junction temperature predictor transfinites; take corresponding processing method; reduce clutch abrasion; protect to greatest extent power-transfer clutch, thereby ensure pulsation-free moment of starting.
Fig. 7 is the structured flowchart of the start system of a kind of hybrid vehicle of the present invention.With reference to Fig. 7, this system can comprise:
Parameter acquisition module 100, for obtaining the brake pedal aperture signal of hybrid vehicle;
Parameter acquisition module 100 can be obtained relevant parameter by vehicle body CAN bus.
Computing module 200, for the brake pedal aperture signal obtaining according to described parameter acquisition module 100, calculate corresponding brake pedal aperture rate of change, acceleration/accel while determining hybrid vehicle starting according to described brake pedal aperture rate of change, the acceleration/accel during according to described starting is determined change speed gear box input shaft torque;
The first judge module 300, for judging whether the driving engine of described hybrid vehicle adopts starter mode to light a fire;
The second judge module 400, in the judged result of described the first judge module be no, judge that whether current SOC is in normal range, and judge whether current battery normally works;
The 3rd judge module 500, for being in two judged results of described the second judge module and being, judges whether current electrical motor torque peak is greater than described change speed gear box input shaft torque;
The 4th judge module 600, for in the case of the judged result of described the 3rd judge module be no, judge that whether current SOC is in normal range, judge whether current battery normally works, and judge present engine torque peak and current electrical motor torque peak and, whether be greater than described change speed gear box input shaft torque;
The 5th judge module 700, being used for is yes in the judged result of described the first judge module, or, arbitrary judged result of described the second judge module is no, or arbitrary judged result of described the 4th judge module is, in no situation, to judge whether current battery can charge, and judge whether maximum power is greater than, hybrid vehicle starting power demand and the required charge power of battery with;
The 6th judge module 800, for being in no situation in arbitrary judged result of described the 5th judge module, judges whether maximum engine torque is greater than described change speed gear box input shaft torque.
Starting determination module 900, for in the case of the judged result of described the 3rd judge module be, the originate mode of determining hybrid vehicle is motor starting, or, in the case of three judged results of described the 4th judge module are and are, the originate mode of determining hybrid vehicle is that driving engine and electrical motor start jointly, or, in the case of two judged results of described the 5th judge module are and are, the originate mode of determining hybrid vehicle is that driving engine and electrical generator start jointly, or, in the case of the judged result of described the 6th judge module be, the originate mode of determining hybrid vehicle is engine starting, or, in the case of the judged result of described the 6th judge module be no, start vehicle launch exception handling.
Fig. 8 is another structured flowchart of the start system of a kind of hybrid vehicle of the present invention.In conjunction with Fig. 7 and system shown in Figure 8, system shown in Figure 8 also comprises:
Power-transfer clutch junction temperature prediction module 1000, for predicting power-transfer clutch junction temperature;
The structured flowchart of power-transfer clutch junction temperature prediction module 1000 can, with reference to Fig. 9, comprise:
Power-transfer clutch junction temperature estimation unit 1001, for according to default power-transfer clutch junction temperature estimation model, estimates current power-transfer clutch junction temperature;
Temperature rise calculating unit 1002, for according to described change speed gear box input shaft torque, present engine rotating speed, the speed of a motor vehicle, shock extent calculates clutch engagement and engagement time, to predict unit friction work, calculates the temperature rise of power-transfer clutch in certain engagement time according to described unit friction work;
Temperature drop calculating unit 1003, for according to ambient temperature, engine-cooling system temperature and friction lining radiating rate, calculate the temperature drop of power-transfer clutch in described certain binding time;
Power-transfer clutch junction temperature predictor calculation unit 1004, deducts described temperature drop for the power-transfer clutch junction temperature of described current estimation is added to the above temperature rise, obtains described power-transfer clutch junction temperature predictor.
The judge module 1100 that transfinites, for judging whether power-transfer clutch junction temperature predictor exceedes predetermined threshold.
Processing module 1200, in the judged result of the described judge module that transfinites be, carry out processings of transfiniting of power-transfer clutch predicted temperature, in the case of the judged result of the described judge module that transfinites be no, execution power-transfer clutch Engagement Control;
The structured flowchart of processing module 1200 can, with reference to Figure 10, comprise:
Warning degree processing unit 1201, reaches predetermined warning degree for the number of times that exceedes predetermined threshold in power-transfer clutch junction temperature predictor, acceleration/accel and set clutch engagement engaging clutch during by described hybrid vehicle starting;
Cooling degree processing unit 1202, reaching predetermined for the number of times that exceedes predetermined threshold in power-transfer clutch junction temperature predictor need to take measures to reduce the degree of temperature rise, improve clutch engagement, reduce unit friction work, or the acceleration/accel while reducing hybrid vehicle starting, determines now required torque, according to described definite now required torque, again on driving engine and electrical motor, carry out torque distribution;
Degree of protection processing unit 1203; too much for exceed the number of times of predetermined threshold in power-transfer clutch junction temperature predictor, reach in the situation of the predetermined degree that cannot ensure the normal work of power-transfer clutch cut-off clutch; with protection clutch-lining, start vehicle launch exception handling simultaneously.
Moment of torsion control module 1300, for after described starting determination module determines that the originate mode of hybrid vehicle is motor starting, control corresponding motor torque, or, after described starting determination module determines that the originate mode of hybrid vehicle is the common starting of driving engine and electrical motor, control corresponding motor torque and engine torque, or, after described starting determination module determines that the originate mode of hybrid vehicle is the common starting of driving engine and electrical generator, control corresponding generator torque, juxtaposition 1stStart=0, control corresponding engine torque, or after described starting determination module determines that the originate mode of hybrid vehicle is engine starting, put 1stStart=0, control corresponding engine torque.
To sum up, the starting method of the hybrid vehicle that the embodiment of the present invention provides and system, tool has the following advantages: make hybrid vehicle obtain best starting ability and safe reliability; In Fraquent start (> 1 time) occasion, there is Reliability Assurance; Maximally utilise electric energy, the economy obtaining and dynamic property; According to driver requested definite moment of starting, agreeing property starting ability; By estimating and predicting clutch temp and corresponding control method, reduce wear, protect to greatest extent power-transfer clutch, and ensure pulsation-free moment of starting.
In this specification sheets, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is and the difference of other embodiment, between each embodiment identical similar part mutually referring to.For the disclosed device of embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates referring to method part.
Professional can also further recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software is clearly described, composition and the step of each example described according to function in the above description in general manner.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.Professional and technical personnel can realize described function with distinct methods to each specifically should being used for, but this realization should not thought and exceeds scope of the present invention.
The software module that the method for describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use hardware, treater to carry out, or the combination of the two is implemented.Software module can be placed in the storage medium of any other form known in random access memory (RAM), internal memory, read-only memory (ROM) (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a starting method for hybrid vehicle, is characterized in that, comprising:
A. obtain the brake pedal aperture signal of hybrid vehicle, calculate corresponding brake pedal aperture rate of change, acceleration/accel while determining hybrid vehicle starting according to described brake pedal aperture rate of change, the acceleration/accel during according to described starting is determined change speed gear box input shaft torque;
Whether the driving engine that B. judges described hybrid vehicle adopts starter mode to light a fire, and if so, performs step F, if not, performs step C;
C. judge that whether current battery charge state SOC is in normal range, and judge whether current battery normally works, if the result of these two judgements is is, performs step D, otherwise, execution step F;
D. judge whether current electrical motor torque peak is greater than described change speed gear box input shaft torque, if so, determine that the originate mode of hybrid vehicle is motor starting, if not, perform step E;
E. judge that whether current SOC is in normal range, judge whether current battery normally works, and judge present engine torque peak and current electrical motor torque peak and, whether be greater than described change speed gear box input shaft torque, if the result of these three judgements is be, the originate mode of determining hybrid vehicle is that driving engine and electrical motor start jointly, otherwise, execution step F;
F. judge whether current battery can charge, and judge whether maximum power is greater than, hybrid vehicle starting power demand and the required charge power of battery with, if these two judged results are be, the originate mode of determining hybrid vehicle is that driving engine and electrical generator start jointly, otherwise, execution step G;
G. judge whether maximum engine torque is greater than described change speed gear box input shaft torque, if so, determine that the originate mode of hybrid vehicle is engine starting, if not, start vehicle launch exception handling.
2. method according to claim 1, is characterized in that, also comprises:
After the originate mode of determining hybrid vehicle is motor starting, control corresponding motor torque, or,
After the originate mode of determining hybrid vehicle is the common starting of driving engine and electrical motor, control corresponding motor torque and engine torque, or,
After the originate mode of determining hybrid vehicle is the common starting of driving engine and electrical generator, control corresponding generator torque, juxtaposition 1stStart=0, controls corresponding engine torque, or,
After the originate mode of determining hybrid vehicle is engine starting, put 1stStart=0, control engine moment of torsion;
Wherein, 1stStart=0 represents that driving engine has carried out first start, does not need again for driving engine is selected originate mode.
3. method according to claim 1, is characterized in that, also comprises:
Prediction power-transfer clutch junction temperature;
Judge whether power-transfer clutch junction temperature predictor exceedes predetermined threshold, if so, carry out the processing of transfiniting of power-transfer clutch predicted temperature, if not, carry out power-transfer clutch Engagement Control.
4. method according to claim 3, is characterized in that, described prediction power-transfer clutch junction temperature is specially:
According to default power-transfer clutch junction temperature estimation model, estimate current power-transfer clutch junction temperature;
According to described change speed gear box input shaft torque, present engine rotating speed, the speed of a motor vehicle, shock extent calculates clutch engagement and engagement time, thus prediction unit friction work calculates the temperature rise of power-transfer clutch in certain engagement time according to described unit friction work, and,
According to ambient temperature, engine-cooling system temperature and friction lining radiating rate, calculate the temperature drop of power-transfer clutch in described certain binding time;
The power-transfer clutch junction temperature of described current estimation is added to the above temperature rise and deduct described temperature drop, obtain described power-transfer clutch junction temperature predictor.
5. according to the method described in claim 3 or 4, it is characterized in that, described execution power-transfer clutch predicted temperature transfinites to process and is specially:
If exceeding the number of times of predetermined threshold, power-transfer clutch junction temperature predictor reaches predetermined warning degree, acceleration/accel and set clutch engagement engaging clutch during by described hybrid vehicle starting;
Reach the predetermined degree that need to take measures to reduce temperature rise if power-transfer clutch junction temperature predictor exceedes the number of times of predetermined threshold, improve clutch engagement, reduce unit friction work, or,
Acceleration/accel while reducing hybrid vehicle starting, determines now required torque, according to described definite now required torque, again on driving engine and electrical motor, carries out torque distribution;
If it is too much that power-transfer clutch junction temperature predictor exceedes the number of times of predetermined threshold, reach the predetermined degree that cannot ensure the normal work of power-transfer clutch, cut-off clutch to protect clutch-lining, starts vehicle launch exception handling simultaneously.
6. a start system for hybrid vehicle, is characterized in that, comprising:
Parameter acquisition module, for obtaining the brake pedal aperture signal of hybrid vehicle;
Computing module, for the brake pedal aperture signal obtaining according to described parameter acquisition module, calculate corresponding brake pedal aperture rate of change, acceleration/accel while determining hybrid vehicle starting according to described brake pedal aperture rate of change, the acceleration/accel during according to described starting is determined change speed gear box input shaft torque;
The first judge module, for judging whether the driving engine of described hybrid vehicle adopts starter mode to light a fire;
The second judge module, in the judged result of described the first judge module be no, judge that whether current SOC is in normal range, and judge whether current battery normally works;
The 3rd judge module, for being in two judged results of described the second judge module and being, judges whether current electrical motor torque peak is greater than described change speed gear box input shaft torque;
The 4th judge module, for in the case of the judged result of described the 3rd judge module be no, judge that whether current SOC is in normal range, judge whether current battery normally works, and judge present engine torque peak and current electrical motor torque peak and, whether be greater than described change speed gear box input shaft torque;
The 5th judge module, being used for is yes in the judged result of described the first judge module, or, arbitrary judged result of described the second judge module is no, or arbitrary judged result of described the 4th judge module is, in no situation, to judge whether current battery can charge, and judge whether maximum power is greater than, hybrid vehicle starting power demand and the required charge power of battery with;
The 6th judge module, for being in no situation in arbitrary judged result of described the 5th judge module, judges whether maximum engine torque is greater than described change speed gear box input shaft torque;
Starting determination module, for in the case of the judged result of described the 3rd judge module be, the originate mode of determining hybrid vehicle is motor starting, or, in the case of three judged results of described the 4th judge module are and are, the originate mode of determining hybrid vehicle is that driving engine and electrical motor start jointly, or, in the case of two judged results of described the 5th judge module are and are, the originate mode of determining hybrid vehicle is that driving engine and electrical generator start jointly, or, in the case of the judged result of described the 6th judge module be, the originate mode of determining hybrid vehicle is engine starting, or, in the case of the judged result of described the 6th judge module be no, start vehicle launch exception handling.
7. system according to claim 6, is characterized in that, also comprises:
Moment of torsion control module, for after described starting determination module determines that the originate mode of hybrid vehicle is motor starting, control corresponding motor torque, or, after described starting determination module determines that the originate mode of hybrid vehicle is the common starting of driving engine and electrical motor, control corresponding motor torque and engine torque, or, after described starting determination module determines that the originate mode of hybrid vehicle is the common starting of driving engine and electrical generator, control corresponding generator torque, juxtaposition 1stStart=0, control corresponding engine torque, or, after described starting determination module determines that the originate mode of hybrid vehicle is engine starting, put 1stStart=0, control corresponding engine torque, wherein, 1stStart=0 represents that driving engine has carried out first start, do not need again for driving engine is selected originate mode.
8. system according to claim 6, is characterized in that, also comprises:
Power-transfer clutch junction temperature prediction module, for predicting power-transfer clutch junction temperature;
The judge module that transfinites, for judging whether power-transfer clutch junction temperature predictor exceedes predetermined threshold;
Processing module, in the judged result of the described judge module that transfinites be, carry out processings of transfiniting of power-transfer clutch predicted temperature, in the case of the judged result of the described judge module that transfinites be no, execution power-transfer clutch Engagement Control.
9. system according to claim 8, is characterized in that, described power-transfer clutch junction temperature prediction module comprises:
Power-transfer clutch junction temperature estimation unit, for according to default power-transfer clutch junction temperature estimation model, estimates current power-transfer clutch junction temperature;
Temperature rise calculating unit, for according to described change speed gear box input shaft torque, present engine rotating speed, the speed of a motor vehicle, shock extent calculates clutch engagement and engagement time, to predict unit friction work, calculates the temperature rise of power-transfer clutch in certain engagement time according to described unit friction work;
Temperature drop calculating unit, for according to ambient temperature, engine-cooling system temperature and friction lining radiating rate, calculate the temperature drop of power-transfer clutch in described certain binding time;
Power-transfer clutch junction temperature predictor calculation unit, deducts described temperature drop for the power-transfer clutch junction temperature of described current estimation is added to the above temperature rise, obtains described power-transfer clutch junction temperature predictor.
10. system according to claim 8 or claim 9, is characterized in that, described processing module comprises:
Warning degree processing unit, reaches predetermined warning degree for the number of times that exceedes predetermined threshold in power-transfer clutch junction temperature predictor, acceleration/accel and set clutch engagement engaging clutch during by described hybrid vehicle starting;
Cooling degree processing unit, reaches predetermined and need to take measures to reduce the degree of temperature rise for exceed the number of times of predetermined threshold in power-transfer clutch junction temperature predictor, improves clutch engagement, reduces unit friction work, or,
Acceleration/accel while reducing hybrid vehicle starting, determines now required torque, according to described definite now required torque, again on driving engine and electrical motor, carries out torque distribution;
Degree of protection processing unit; too much for exceed the number of times of predetermined threshold in power-transfer clutch junction temperature predictor, reach in the situation of the predetermined degree that cannot ensure the normal work of power-transfer clutch cut-off clutch; with protection clutch-lining, start vehicle launch exception handling simultaneously.
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