CN109915298A - A kind of control method of hybrid electric vehicle engine quick start - Google Patents
A kind of control method of hybrid electric vehicle engine quick start Download PDFInfo
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Abstract
A kind of control method of hybrid electric vehicle engine quick start, first selecting driving mode is ECO mode or SPORT mode, issue starting engine instruction again to be started, in start-up course, first high-voltage generator staring torque is adjusted, until engine speed has reached expectation revolving speed section, and when the normal oil spout of engine, high-voltage generator is switched into power generation mode by electric model again, power compensation mechanism is triggered simultaneously, to compensate the electric energy of performance during rapid starting period mesohigh generator consumption, and evade battery over-discharge failure, until high-voltage generator enters normal power generation working condition, quick start is completed at this time.The design can not only realize engine quick start on the basis of the driving intention and vehicle real-time working condition of effectively identification driver, adapt to limit power demand, and can evade the failure of removal of high-tension system and mechanical power member.
Description
Technical field
The present invention relates to a kind of starting methods of engine, belong to hybrid vehicle control technology field, more particularly to
A kind of control method of hybrid electric vehicle engine quick start.
Background technique
The degree of perfection that existing pure electric automobile, plug-in hybrid-power automobile are limited by electrically-charging equipment is not high, causes
Vehicle Energy Management System can not effectively control high-tension battery electricity, thus bring continual mileage anxiety, high voltage power battery
The problems such as power performance obviously decays under power shortage state.And using engine as increasing the hybrid vehicle of journey equipment for petroleum
Fuel can solve pure electric automobile continual mileage anxiety problem as vehicle energy source, and can be transported in real time according to vehicle
The working condition of row operating conditions engine is being protected with realizing effective control of the vehicle Energy Management System to high-tension battery electricity
High voltage power battery power shortage is avoided under the premise of card power performance.
In order to realize efficient vehicle energy management strategies, need according to real-time vehicle driving-cycle, driver intention,
The information such as high voltage power battery charge state determine engine starting opportunity and desired operation interval.Therefore, hybrid power vapour
Vehicle must realize that the active control to engine start, starting method are divided into two kinds, first is that being realized using low-pressure starting machine system
The autostart function of engine, second is that being during startup converted to the ISG high-voltage generator being mechanically connected with engine
Motor is counter to drag engine to complete starting.
The energy source of starter in two methods is respectively from 12/24V A-battery and high voltage power battery,
It is middle that high voltage power battery is used to have benefited from biggish starter power as the starting method of energy source, it can be obviously shortened and start
The starting time of machine, but the scene of the limit power demand such as high-power instruction or radical driving mode is exported for driver, it is existing
There is technology less to the transient response concern of engine start, does not account for according to the instruction of the transient state of driver or driving intention
Engine starting process is optimized.
The information for disclosing the background technology part is merely intended to increase the understanding to the general background of present patent application, without
It should be considered as recognizing or implying in any form that the information constitutes existing skill already known to those of ordinary skill in the art
Art.
Summary of the invention
The purpose of the present invention is overcome it is existing in the prior art cannot effectively identification driver driving intention and vehicle
The defect and problem realized engine quick start on the basis of real-time working condition, do not adapt to limit power demand, provide one
Kind can realize engine quick start on the basis of the driving intention of effectively identification driver is with vehicle real-time working condition, adapt to
The control method of the hybrid electric vehicle engine quick start of limit power demand.
In order to achieve the above object, the technical solution of the invention is as follows: a kind of hybrid electric vehicle engine quick start
Control method；
The hybrid vehicle includes entire car controller, drive motor controller, driving motor system, high voltage power electricity
Pond, high-voltage generator, engine, driving mode selecting unit and ECU, the entire car controller and drive motor controller, height
Pressure power battery, high-voltage generator, driving mode selecting unit all carry out signal connection, the drive motor controller and driving
Electric system is electrically connected, and driving motor system and driving wheel 31 carry out machine driving connection, the high voltage power battery with
Drive motor controller, high-voltage generator are electrically connected, and the high-voltage generator and engine carry out machine driving connection；
The control method includes the following steps: that first selecting driving mode by driving mode selecting unit by driver is
ECO mode or SPORT mode, ECO mode, the corresponding engine speed of SPORT mode are respectively economic speed section, peak work
Rate revolving speed section, then starting engine instruction is issued to be started, during startup, first to high pressure by entire car controller
Electric motor starting torque is adjusted, until engine speed has reached economic speed section or peak power engine speed section, and is sent out
When the normal oil spout of motivation, then high-voltage generator is switched into power generation mode by electric model, while triggering power compensation mechanism, it is high
Pressure motor improves power generation torque according to real-time power demand, and the high voltage power battery in electric discharge operating condition is adjusted to charge
Operating condition evades battery over-discharge failure to compensate the electric energy of performance during rapid starting period mesohigh generator consumption, until high-voltage power
Machine enters normal power generation working condition, and quick start is completed at this time.
The driving motor system includes distributed electrical drive system or centralized power drive system.
When the driving mode is ECO mode, by power closed-loop control, maximum staring torque limitation to high-voltage generator
Staring torque is adjusted；
When the driving mode is SPORT mode, by power closed-loop control, maximum staring torque limitation, prevent from starting
Machine driving protection mechanism is adjusted high-voltage generator staring torque.
The normal oil spout of engine refers to that engine is successfully activated, and whether engine is successfully activated, by starting
Machine injection system working condition judgment module determines that the state variable of the engine injection system working condition judgment module includes
The real-time revolving speed of engine, high-voltage generator actual output torque, the real-time output torque of engine.
Under the power compensation mechanism, in the power compensation machining function stage, ECU is improved circulating fuel injection quantity and is started with stabilization
Machine revolving speed, injection system complete the construction work of high injection pressure, until high-voltage generator enters normal power generation working condition.
When entire car controller issues starting engine instruction to be started, if it is judged that engine is in cold shape
State then triggers cold starting control strategy and carries out heat engine, conversely, continuing to press step downwards if engine is in heat engine state
It carries out；Wherein, engine is in cold or heat engine state judges according to following formula:
T in formulaCoolantIndicate the engine coolant temperature value of ECU real time monitoring；PMachine-oilIndicate ECU real time monitoring
Engine oil pressure size；TThrIndicate the minimum engine coolant temperature of the triggering enabled instruction of entire car controller setting
Spend threshold value；PThrIndicate the minimum engine oil pressure threshold value of the triggering enabled instruction of entire car controller setting；
State1 indicates to judge that engine is in when engine coolant temperature is lower or engine oil pressure is smaller
Cold state；State2 indicates to judge that engine is in when engine coolant temperature is higher and engine oil pressure is larger
Heat engine state.
Described be adjusted to high-voltage generator staring torque refers to: choosing entire car controller and is sent to high-voltage generator control
Torque command, the control model of device processed are used as control variable；Choose the real-time revolving speed of engine, high-voltage generator reality output power
Square, the maximum allowable discharge power of high voltage power battery, the real-time output power of high voltage power battery are as power closed-loop control, maximum
Staring torque limitation, the state variable for preventing engine mounted longitudinally racing protection mechanism.
The engine injection system working condition judgment module is run according to following formula:
F in above formularIndicate engine start resistance, nEngineIndicate the real-time revolving speed of engine,Indicate engine
The discrete differential value of revolving speed, TEngineIndicate the engine output torque that ECU is calculated according to information such as distributive values, TminIt indicates
Engine minimum output torque,It characterizes and is only changed by the theoretical internal resistance that machinery inertial influences under the non-fired state of engine
Rate peak value；
If the State1 in above formula indicates engine start resistance, there is no the engine output forces that bust or ECU are fed back
Square is not more than 0 always, then judges that engine is not activated；If State2 indicates that bust and ECU has occurred in engine start resistance
The engine output torque of feedback is fluctuated in engine minimum output torque, then judges that engine is activated, and lights a fire successfully.
If nEngineEngine idle rotational is alreadyd exceed, and entire car controller judges that engine is still in State1 shape
State then judges that engine start fails, and the instruction zero setting of high-voltage generator staring torque drops engine by entire car controller immediately
Speed carries out regnition, and when engine speed oil spout revolving speed minimum lower than ECU, entire car controller is again by power closed loop control
System adjusts the instruction of high-voltage generator staring torque with maximum staring torque limitation in real time, improves engine speed and activate engine
Oil spout ignition system；If entire car controller still judges that engine start fails in engine secondary ignition process, full-vehicle control
Device no longer issues the instruction of starting engine and output engine startup separator signal.
Under the power compensation mechanism, it is real to choose the real-time revolving speed of engine, high-voltage generator actual output torque, engine
When output torque, the maximum allowable charge power of high voltage power battery, the real-time output power of high voltage power battery is as power compensation
The state variable of mechanism；The power compensation mechanism is run according to following formula:
In above formula, nECOIniIndicate the starting power generation revolving speed of high-voltage generator under ECO mode；nMinECOIt indicates under ECO mode
The minimum operating speed of high-voltage generator；noffsetThe fluctuation deviation of engine speed during expression power compensation；nVibIt indicates
Permission revolving speed deviation under engine stabilizer state；PBMSAllowMaxCIndicate the maximum allowable charge power of high voltage power battery；
Kp、Ki、KdIt is characterized parameter；
In above formula, nEngineCMDIndicate that entire car controller is sent to the engine expectation rotary speed instruction of ECU, when engine turns
Speed is more than nMinECO/SPORTAnd after continuing ten message periods, entire car controller determines that engine speed has power generation conditions, immediately
Rotary speed instruction is sent to ECU and high-voltage generator control model is converted into power generation by driving, and ECU is according to nEngineCMDWith by
The real-time revolving speed active accommodation oil spout frequency of the engine that load of electrical generation influences realizes energy output；
T in above formulaCompDesIndicate power compensation during desired power generation torque, the setting target of the expectation torque be
Guarantee to improve charge power as far as possible under the premise of battery does not overcharge, while entire car controller will pass through TStartMaxTo the target torque
It is limited；
T in above formulaComCMDThe power generation torque instruction that entire car controller issues during expression power compensation, the instruction are being sent out
Motivation fluctuation of speed size in the reasonable scope when with TCompDesSubject to, if engine speed fluctuations amplitude is more than zone of reasonableness,
Illustrate that high-voltage generator power generation torque is larger, the unbearable load of the real-time injection pressure of engine, entire car controller draws at this time
Enter PID regulator, with noffsetTo control target, to TComCMDFeedback regulation is carried out, prevents engine speed from further decreasing, makes
Engine speed reaches stable state；
Final State indicates the completion status of entire starting work in above formula, illustrates the structure of the high injection pressure of engine
It builds work to have completed, high-voltage generator enters normal power generation working condition.
Compared with prior art, the invention has the benefit that
1, in a kind of control method of hybrid electric vehicle engine quick start of the present invention, the driving according to driver is anticipated
Start-up mode is divided into two kinds of ECO mode, SPORT mode by figure, and each pattern is equipped with the (economic speed of corresponding revolving speed section
Section, peak power engine speed section) and corresponding quick start method, to meet different starting demands.Thus, energy of the present invention
Engine quick start is realized on the basis of the driving intention and vehicle real-time working condition of effectively identification driver, adapts to the limit
Power demand.
2, in a kind of control method of hybrid electric vehicle engine quick start of the present invention, during startup, to height
Pressure electric motor starting torque is adjusted, so that engine speed reaches economic speed section or peak power engine speed section, and
The specific steps of adjustment include by power closed-loop control, maximum staring torque limitation, prevent engine mounted longitudinally racing protection mechanism, should
Design had not only been able to achieve revolving speed adjustment, but also can evade the failure of removal of high-tension system and mechanical power member.Therefore, the present invention had been both
It can smoothly start, and failure can be reduced.
3, in a kind of control method of hybrid electric vehicle engine quick start of the present invention, once engine speed reaches
Economic speed section or peak power engine speed section, and when the normal oil spout of engine, it will be by high-voltage generator by electric model
Power generation mode is switched to, while triggering power compensation mechanism, both can overcome the disadvantages that the electricity of performance during rapid starting period mesohigh generator consumption
Can, and battery over-discharge failure can be evaded.Therefore, sexual valence of the invention is relatively high, and failure is less.
4, the unexpected shape in a kind of control method of hybrid electric vehicle engine quick start of the present invention, when for starting
Condition, if engine is cold or heat engine, starting for the first time unsuccessfully waits and all devises corresponding control strategy, real to improve the present invention
The validity applied with it is comprehensive.Therefore, adaptation range of the invention is wider, and validity is higher.
Detailed description of the invention
Fig. 1 is hardware architecture diagram of the invention.
Fig. 2 is operational flowchart when encountering cold, heat engine when starting in the present invention.
Fig. 3 is the judgement of engine activation state and regnition control module flow diagram in the present invention.
Fig. 4 is mesohigh generator startup power of the present invention limitation and closed loop control module flow diagram.
Fig. 5 is preventing engine driving protection mechanism flow diagram in the present invention under SPORT mode.
Fig. 6 is power compensation-engine injection pressure stability contorting block process schematic diagram in the present invention.
Fig. 7 is engine speed, high-voltage generator moment variations figure under ECO mode in embodiment 1 in the present invention.
Fig. 8 is high voltage power battery current, high-voltage generator moment variations figure under ECO mode in embodiment 1 in the present invention.
Fig. 9 is engine speed, high-voltage generator moment variations figure under SPORT mode in embodiment 1 in the present invention.
Figure 10 is high voltage power battery current, high-voltage generator moment variations under SPORT mode in embodiment 1 in the present invention
Figure.
In figure: entire car controller 1, drive motor controller 2, driving motor system 3, driving wheel 31, high voltage power battery
4, high-voltage generator 5, engine 6, driving mode selecting unit 7.
Specific embodiment
Below in conjunction with Detailed description of the invention and specific embodiment, the present invention is described in further detail.
Referring to Fig. 1, hybrid vehicle applied by the present invention includes entire car controller 1, drive motor controller 2, drives
Dynamic electric system 3, high voltage power battery 4, high-voltage generator 5, engine 6, driving mode selecting unit 7 and ECU, the vehicle
Controller 1 and drive motor controller 2, high voltage power battery 4, high-voltage generator 5, driving mode selecting unit 7 all carry out letter
Number connection, the drive motor controller 2 is electrically connected with driving motor system 3, driving motor system 3 and driving wheel 31 into
The connection of row machine driving, the high voltage power battery 4 is electrically connected with drive motor controller 2, high-voltage generator 5, described
High-voltage generator 5 and engine 6 carry out machine driving connection.
Whole control method of the invention includes: first to select driving mode by driving mode selecting unit 7 by driver
For ECO mode or SPORT mode, ECO mode, the corresponding engine speed of SPORT mode are respectively economic speed section, peak value
Power revolving speed section, then starting engine instruction is issued to be started, during startup, first to height by entire car controller 1
5 staring torque of pressure motor is adjusted, until engine speed has reached economic speed section or peak power engine speed section,
And when 6 normal oil spout of engine, then high-voltage generator 5 switched into power generation mode by electric model, while triggering power compensation
Mechanism, high-voltage generator 5 improve power generation torque according to real-time power demand, by the high voltage power battery 4 in electric discharge operating condition
Charging operating condition is adjusted to compensate the electric energy of the consumption of performance during rapid starting period mesohigh generator 5, and evades battery over-discharge failure, directly
Enter normal power generation working condition to high-voltage generator 5, quick start is completed at this time.
One, referring to fig. 2, according to real-time 6 status monitoring information of engine, judge whether engine 6 is in cold state,
When entire car controller 1 issues starting engine instruction, if it is judged that engine 6 is in cold state, then triggers cold and open
Dynamic control strategy carries out heat engine, conversely, trigger warm boot control strategy if engine 6 is in heat engine state, according to opening
The step of dynamic --- economic speed section or peak power engine speed section --- normal power generation, controls high-voltage generator 5 and engine
6 work, the specific steps are as follows:
(1), cold, heat engine processing step:
When entire car controller 1 issues starting engine instruction to be started, if it is judged that engine 6 is in cold
State then triggers cold starting control strategy and carries out heat engine, conversely, continuing downwards if engine 6 is in heat engine state by step
It is rapid to carry out；Wherein, engine 6 is in cold or heat engine state judges according to following formula:
T in formulaCoolantIndicate the 6 coolant temperature value of engine of ECU real time monitoring；PMachine-oilIndicate that ECU is supervised in real time
The 6 engine oil pressure size of engine of control；TThrIndicate that the minimum engine 6 for the triggering enabled instruction that entire car controller 1 is arranged is cooling
Liquid temperature threshold；PThrIndicate the 6 engine oil pressure threshold value of minimum engine for the triggering enabled instruction that entire car controller 1 is arranged；
State1 indicates to judge at engine 6 when 6 coolant temperature of engine is lower or 6 engine oil pressure of engine is smaller
In cold state；State2 indicates to judge engine when 6 coolant temperature of engine is higher and 6 engine oil pressure of engine is larger
6 are in heat engine state.
(2), economic speed section or peak power engine speed interval selection step:
N in formulaEngineIndicate the actual speed of engine 6；nECOIndicate the engine 6 selected based on fuel economy optimization
Economy optimizes revolving speed section, and when driver selects economic model when driving, high-voltage generator 5 needs quickly counter to drag engine 6
Optimize revolving speed section to the economy；nPowerMaxIt indicates to maximize selected 6 dynamic property of engine based on 6 output power of engine
Optimize revolving speed section, when driver selects motor pattern when driving, high-voltage generator 5 needs quickly counter to drag engine 6 dynamic to this
Power optimizes revolving speed section.
Two, referring to Fig. 3, during startup, when ECU detects that engine speed is more than oil spout/igniting minimum speed, electricity
Sub- injection system is started to work, i.e., engine 6 is successfully activated.Engine injection system working condition judgment module main function
It is to be judged rapidly to whether engine 6 is successfully activated:
F in above formularIndicate 6 resistance of start of engine, nEngineIndicate the real-time revolving speed of engine 6,Expression is started
The discrete differential value of machine revolving speed, TEngineIndicate 6 output torque of engine that ECU is calculated according to information such as distributive values, Tmin
Indicate the minimum output torque of engine 6,Characterize the non-fired state of engine 6 under only by machinery inertial influence theory in
Resistive rate peak value；
If the State1 in above formula indicates 6 resistance of start of engine, there is no the outputs of engine 6 that bust or ECU are fed back
Torque is not more than 0 always, then judges that engine 6 is not activated；If State2 indicates that bust has occurred simultaneously in 6 resistance of start of engine
6 output torque of engine of ECU feedback then judges that engine 6 is activated, puts igneous in the minimum output torque fluctuation of engine 6
Function.
If nEngine6 idling speed of engine is alreadyd exceed, and entire car controller 1 judges that engine 6 is still in State1
State, then judge the starting failure of engine 6, and the instruction zero setting of 5 staring torque of high-voltage generator is made to start by entire car controller 1 immediately
6 reduction of speed of machine carries out regnition, and when engine speed oil spout revolving speed minimum lower than ECU, entire car controller 1 is again by power
Closed-loop control adjusts the instruction of 5 staring torque of high-voltage generator with maximum staring torque limitation in real time, improves engine speed and swashs
6 oil spout ignition system of engine living；If entire car controller 1 still judges that the starting of engine 6 is lost during 6 regnition of engine
It loses, entire car controller 1 no longer issues the instruction of starting engine and 6 startup separator signal of output engine.
Three, referring to fig. 4, power closed-loop control and maximum staring torque limitation specific embodiment are shown in Fig. 4:
As shown in Figure 4, power closed-loop control and maximum staring torque limitation main function are in high-voltage generator 5 as electricity
Motivation, which activates engine 6 and promoted, to be shortened the starting time in its Rotation Process as much as possible and carries out to 5 power of high-voltage generator
Closed-loop control is to evade 4 over-discharge failure of high voltage power battery:
In above formula, nGCUIndicate the real-time revolving speed of high-voltage generator 5；PGCUECOIndicate the peak of high-voltage generator 5 under ECO mode
It is worth startup power；PGCUSPORTIndicate the peak start-up power of high-voltage generator 5 under SPORT mode；TStartMaxIt indicates by high pressure
The staring torque peak value that 5 peak value staring torque of motor and the maximum allowable staring torque of engine 6 are calculated；PBMSIndicate high pressure
The real-time charge-discharge electric power of power battery 4；PBMSAllowMaxDCIndicate the maximum allowable discharge power of high voltage power battery 4；TGCUTable
Show the real-time torque of high-voltage generator 5 of 5 controller of high-voltage generator feedback；TStartCMDIndicate the staring torque instruction that VCU is issued
Value；A, b is characterized constant.
In above formula, TStartDesIndicate the target output during high-voltage generator 5 promotes engine speed as motor
Torque, which determined by two governing equations, one is f (), that is, indicate by PGCUECO/SPORT、TStartMaxIt determines
5 target output torque of high-voltage generator follows the external characteristic curve of rotation speed change, another governing equation is g (), mainly makees
With being according to PBMSAnd PBMSAllowMaxDC5 startup power of high-voltage generator is limited to evade 4 over-discharge of high voltage power battery event
Barrier.
In above formula, TerrorIndicate the error between the practical staring torque of high-voltage generator 5 and staring torque instruction；VCU is adopted
Feedback loop is built with Second Order Sliding Mode Control device, is control target to T with staring torque errorStartcMDCarry out closed loop adjustment.
Four, referring to Fig. 5, prevent the specific embodiment of 6 driving protection mechanism of engine from seeing Fig. 5 under SPORT mode:
As shown in Figure 5, since under SPORT mode, the expectation revolving speed section of engine 6 is higher and high-voltage generator 5 starts
Power is larger, if being unable to accurately control staring torque in performance during rapid starting period, is easy to appear 6 runaway problem of engine.Cause
This, VCU is introduced during promoting engine speed under SPORT mode prevents the protection mechanism of driving as follows:
In above formula, nSPORTIniIndicate the starting power generation revolving speed of high-voltage generator 5 under SPORT mode；nMinSPORTIt indicates
The minimum operating speed of high-voltage generator 5 under SPORT mode；Wherein, nSPORTIni> nMinSPORT。
State1 in above formula indicates that engine speed has been promoted to nSPORTIn revolving speed section, and power closed-loop control
Speed overshoot amount below 5%；State2 indicates that engine speed is excessive, and the speed overshoot amount of power closed-loop control has surpassed
Cross 5%.
When engine speed is in State1, VCU halves the peak start-up power of high-voltage generator 5, drops rapidly
Low staring torque；If engine speed change rate attenuation amplitude is smaller, engine speed is promoted to rapidly State2 by State1
When, staring torque resets immediately and continues ten message periods, reduces engine speed.
It prevents 6 driving protection mechanism of engine using twin-stage sliding formwork control, is reduced by two groups of sliding-mode surfaces of setting, classification high
5 staring torque of pressure motor responds rapid feature using sliding formwork control and control effectively, advises to engine speed overshoot
Keep away driving failure.It should be noted that the protection mechanism is i.e. voluntarily after 5 control mode switch of high-voltage generator is power generation mode
It exits.
Five, referring to Fig. 6, the specific embodiment of power compensation and 6 injection pressure stability contorting of engine is shown in Fig. 6:
As shown in Figure 6, after engine 6 is successfully activated, and revolving speed has been promoted in desired revolving speed section, electric energy
Compensation mechanism is started to work, and main function is to compensate the electric energy of the consumption of performance during rapid starting period mesohigh generator 5 and by applying
The construction work for adding load of electrical generation appropriate that 6 injection system of engine is made to complete high injection pressure:
In above formula, nECOIniIndicate the starting power generation revolving speed of high-voltage generator 5 under ECO mode；nMinECOIt indicates under ECO mode
The minimum operating speed of high-voltage generator 5；noffsetThe fluctuation deviation of engine speed during expression power compensation；nVibIt indicates
Permission revolving speed deviation under 6 stable state of engine；PBMSAllowMaxCIndicate the maximum allowable charge power of high voltage power battery 4；
Kp、Ki、KdIt is characterized parameter；
In above formula, nEngineCMDIt indicates that entire car controller 1 is sent to the expectation rotary speed instruction of engine 6 of ECU, works as engine
Revolving speed is more than nMinECO/SPORTAnd after continuing ten message periods, entire car controller 1 determines that engine speed has power generation conditions,
Rotary speed instruction is sent to ECU immediately and 5 control model of high-voltage generator is converted into power generation by driving, and ECU is according to nEngineCMDWith
The real-time revolving speed active accommodation oil spout frequency of engine 6 influenced by load of electrical generation realizes energy output；
T in above formulaCompDesIndicate power compensation during desired power generation torque, the setting target of the expectation torque be
Guarantee to improve charge power as far as possible under the premise of battery does not overcharge, while entire car controller 1 will pass through TStartMaxTo the target force
Square is limited；
T in above formulaComCMDThe power generation torque instruction that entire car controller 1 issues during expression power compensation, the instruction are being sent out
Motivation fluctuation of speed size in the reasonable scope when with TCompDesSubject to, if engine speed fluctuations amplitude is more than zone of reasonableness,
Illustrate that 5 power generation torque of high-voltage generator is larger, the 6 unbearable load of real-time injection pressure of engine, entire car controller 1 at this time
PID regulator is introduced, with noffsetTo control target, to TComCMDFeedback regulation is carried out, prevents engine speed from further decreasing,
Engine speed is set to reach stable state；
Final State indicates the completion status of entire starting work in above formula, illustrates the structure of the high injection pressure of engine 6
It builds work to have completed, high-voltage generator 5 enters normal power generation working condition.
The principle of the present invention is described as follows:
In order to improve engine to the adaptability of limit power demand scene, the present invention is mechanical with driving member optimization
The responsiveness of component is to realize that extreme power request, the high voltage power energy content of battery consume automotive power under the operating conditions such as larger
Transient response performance belongs to mechanical-electric coupling control scope.
It is that the strong response of electric energy should be given full play in the transient controls such as Mechanical Driven in electric drive, the rapid transition of electric drive
Property to adapt to driver's power request and vehicle real-time status, with greater need for guaranteeing that mechanical system and high-tension system have biggish peace
It is real to realize that the failure of removal such as excessive to the over-discharge of high voltage power over-charging of battery, engine mounted longitudinally racing, engine load rate carry out for full nargin
When failure predication and effectively control.Therefore, formulating the quick start protection mechanism that serious forgiveness is high, the scope of application is big is to realize fastly
The necessary condition of speed starting.
It further, can be flexible by formulating rationally efficient energy management strategies and engine real-time state monitoring
Starting opportunity, the operation interval for adjusting engine realize engine start and the identification of driver's driving intention, high voltage power battery
The coupling control that power shortage is evaded improves the utilization scene coverage rate of ISG starting engine, especially excellent for responsiveness and safety
The response performance and output power control method of the engine under limit power demand scene are changed.
In the present invention, in the power compensation machining function stage, due to the raising of engine loading, revolving speed has certain amplitude
Fluctuation, ECU stablizes engine speed by improving circulating fuel injection quantity, and injection system completes the construction work of high injection pressure.
Embodiment 1:
Referring to Fig. 1-Figure 10, step according to the above method, equipment peak speed be 3000rpm diesel engine 6 it is mixed
It closes and implements the present invention on power vehicle.It should be strongly noted that measuring in engine pedestal test with automatic start-stop
It is 6.2 seconds or so time-consuming to idling 800rpm that system (peak start-up power 20KW) starts engine.And by the present invention, in ECO mould
Start successfully under formula and SPORT mode, realize quick start, the control effect of multiple protection mechanisms is verified as follows
(referring to Fig. 7-Figure 10):
In ECO mode initiation procedure, 4 maximum discharge power of high voltage power battery is 28.8KW, is lower than PBMSAllowMaxDC
(153.6KW), power closed-loop control effectively limit 5 startup power of high-voltage generator；The maximum staring torque of high-voltage generator 5 is not
More than TstartMax(400N*m), maximum staring torque limitation work are effective；Engine speed is for the first time more than nECOIni(1550rpm)
It is 1.72 seconds time-consuming, compared with automatic start-stop system, significantly reduces engine 6 and start the time；During engine peed stable,
4 maximum charge power of high voltage power battery is 23.2KW, is lower than PBMSAllowMaxC(102.4KW), 6 oil spout of power compensation-engine
The work of pressure stability contorting module is effective；
In SPORT mode initiation procedure, 4 maximum discharge power of high voltage power battery is 65.8KW, is lower than
PBMSAllowMaxDC(153.6KW), power closed-loop control effectively limit 5 startup power of high-voltage generator；High-voltage generator 5 is maximum
Staring torque is no more than TstartMax(400N*m), maximum staring torque limitation work are effective；Engine speed is more than for the first time
nSPORTIni(2500rpm) is 2.42 seconds time-consuming, compared with automatic start-stop system, significantly reduces engine 6 and starts the time；Engine
6 maximum speeds, speed overshoot amount are respectively 2652rpm and 6%, although overshoot has been more than the threshold value of second level sliding mode controller
5%, but do not continue the trend improved, that is, prevent 6 driving protection mechanism of engine effective；During engine peed stable,
4 maximum charge power of high voltage power battery is 52.7KW, is lower than PBMSAllowMaxC(102.4KW), 6 oil spout of power compensation-engine
The work of pressure stability contorting module is effective.
The foregoing is merely better embodiment of the invention, protection scope of the present invention is not with above embodiment
Limit, as long as those of ordinary skill in the art's equivalent modification or variation made by disclosure according to the present invention, should all be included in power
In the protection scope recorded in sharp claim.
Claims (10)
1. a kind of control method of hybrid electric vehicle engine quick start, it is characterised in that:
The hybrid vehicle includes entire car controller (1), drive motor controller (2), driving motor system (3), high pressure
Power battery (4), high-voltage generator (5), engine (6), driving mode selecting unit (7) and ECU, the entire car controller
(1) with drive motor controller (2), high voltage power battery (4), high-voltage generator (5), driving mode selecting unit (7) all into
The connection of row signal, the drive motor controller (2) is electrically connected with driving motor system (3), driving motor system (3) and
Driving wheel 31 carries out machine driving connection, the high voltage power battery (4) and drive motor controller (2), high-voltage generator (5)
It is electrically connected, the high-voltage generator (5) and engine (6) carry out machine driving connection；
The control method includes the following steps: that first selecting driving mode by driving mode selecting unit (7) by driver is
ECO mode or SPORT mode, ECO mode, the corresponding engine speed of SPORT mode are respectively economic speed section, peak work
Rate revolving speed section, then starting engine instruction is issued to be started, during startup, first to height by entire car controller (1)
Pressure motor (5) staring torque is adjusted, until engine speed has reached economic speed section or peak power engine speed area
Between, and when engine (6) normal oil spout, then high-voltage generator (5) switched into power generation mode by electric model, while triggering electricity
Energy compensation mechanism, high-voltage generator (5) improve power generation torque according to real-time power demand, and the height in electric discharge operating condition is pressed
Power battery (4) is adjusted to charging operating condition to compensate the electric energy of performance during rapid starting period mesohigh generator (5) consumption, and evades battery
Over-discharge failure, until high-voltage generator (5) enter normal power generation working condition, quick start is completed at this time.
2. a kind of control method of hybrid electric vehicle engine quick start according to claim 1, it is characterised in that:
The driving motor system (3) includes distributed electrical drive system or centralized power drive system.
3. a kind of control method of hybrid electric vehicle engine quick start according to claim 1 or 2, feature exist
In: when the driving mode is ECO mode, high-voltage generator (5) is opened by power closed-loop control, maximum staring torque limitation
Kinetic moment is adjusted；
When the driving mode is SPORT mode, by power closed-loop control, maximum staring torque limitation, prevent engine from flying
Vehicle protection mechanism is adjusted high-voltage generator (5) staring torque.
4. a kind of control method of hybrid electric vehicle engine quick start according to claim 1 or 2, feature exist
In: the normal oil spout of engine refers to that engine (6) is successfully activated, and whether engine (6) is successfully activated, by sending out
Motivation injection system working condition judgment module is determining, the state variable packet of the engine injection system working condition judgment module
Include the real-time revolving speed of engine, high-voltage generator actual output torque, the real-time output torque of engine.
5. a kind of control method of hybrid electric vehicle engine quick start according to claim 1 or 2, feature exist
In: under the power compensation mechanism, in the power compensation machining function stage, ECU improves circulating fuel injection quantity and is turned with stablizing engine
Speed, injection system complete the construction work of high injection pressure, until high-voltage generator (5) enter normal power generation working condition.
6. a kind of control method of hybrid electric vehicle engine quick start according to claim 1 or 2, feature exist
In: when entire car controller (1) issues starting engine instruction to be started, if it is judged that engine is in cold shape
State then triggers cold starting control strategy and carries out heat engine, conversely, continuing to press step downwards if engine is in heat engine state
It carries out；Wherein, engine is in cold or heat engine state judges according to following formula:
T in formulaCoolantIndicate the engine coolant temperature value of ECU real time monitoring；PMachine-oilIndicate the hair of ECU real time monitoring
Motivation engine oil pressure size；TThrIndicate the minimum engine coolant temperature of the triggering enabled instruction of entire car controller (1) setting
Threshold value；PThrIndicate the minimum engine oil pressure threshold value of the triggering enabled instruction of entire car controller (1) setting；
State1 indicates to judge that engine is in cold when engine coolant temperature is lower or engine oil pressure is smaller
State；State2 indicates to judge that engine is in heat engine when engine coolant temperature is higher and engine oil pressure is larger
State.
7. a kind of control method of hybrid electric vehicle engine quick start according to claim 3, it is characterised in that:
Described be adjusted to high-voltage generator (5) staring torque refers to: choosing entire car controller (1) and is sent to high-voltage generator (5)
Torque command, the control model of controller are used as control variable；It is practical defeated to choose the real-time revolving speed of engine, high-voltage generator (5)
Output power is closed as power in real time for torque, the maximum allowable discharge power of high voltage power battery (4), high voltage power battery (4) out
Ring control, maximum staring torque limitation, the state variable for preventing engine mounted longitudinally racing protection mechanism.
8. a kind of control method of hybrid electric vehicle engine quick start according to claim 4, it is characterised in that:
The engine injection system working condition judgment module is run according to following formula:
F in above formularIndicate engine start resistance, nEngineIndicate the real-time revolving speed of engine,Indicate engine speed
Discrete differential value, TEngineIndicate the engine output torque that ECU is calculated according to information such as distributive values, TminExpression is started
Machine minimum output torque,Characterize the theoretical internal resistance change rate peak only influenced by machinery inertial under the non-fired state of engine
Value；
If the State1 in above formula indicates engine start resistance, there is no the engine output torque beginnings that bust or ECU are fed back
It is not more than 0 eventually, then judges that engine is not activated；If State2 indicates that bust and ECU feedback has occurred in engine start resistance
Engine output torque engine minimum output torque fluctuate, then judge that engine is activated, and lights a fire successfully.
9. a kind of control method of hybrid electric vehicle engine quick start according to claim 8, it is characterised in that:
If nEngineEngine idle rotational is alreadyd exceed, and entire car controller (1) judges that engine is still in State1 state, then
Judge engine (6) starting failure, the instruction zero setting of high-voltage generator (5) staring torque is made to start by entire car controller (1) immediately
Machine (6) reduction of speed carries out regnition, when engine speed is lower than the minimum oil spout revolving speed of ECU, entire car controller (1) again by
Power closed-loop control and maximum staring torque, which limit, to be adjusted the instruction of high-voltage generator (5) staring torque in real time, improves engine turn
Speed simultaneously activates engine oil spout ignition system；If entire car controller (1) still judges engine in engine secondary ignition process
(6) starting failure, entire car controller (1) no longer issue the instruction of starting engine and output engine startup separator signal.
10. a kind of control method of hybrid electric vehicle engine quick start according to claim 5, feature exist
In: under the power compensation mechanism, it is real-time to choose the real-time revolving speed of engine, high-voltage generator (5) actual output torque, engine
The real-time output power of output torque, the maximum allowable charge power of high voltage power battery (4), high voltage power battery (4) is as electric energy
The state variable of compensation mechanism；The power compensation mechanism is run according to following formula:
nEngineCMD=nECO/SPORTIni
noffset=nECO/SPORTIni-nEngine
In above formula, nECOIniIndicate the starting power generation revolving speed of high-voltage generator (5) under ECO mode；nMinECOIndicate high under ECO mode
The minimum operating speed of pressure motor (5)；noffsetThe fluctuation deviation of engine speed during expression power compensation；nVibIt indicates
Permission revolving speed deviation under engine stabilizer state；PBMSAllowMaxCIndicate the maximum allowable charging function of high voltage power battery (4)
Rate；Kp、Ki、KdIt is characterized parameter；
In above formula, nEngineCMDIt indicates that entire car controller (1) is sent to the engine expectation rotary speed instruction of ECU, works as engine speed
More than nMinECO/SPORTAnd after continuing ten message periods, entire car controller (1) determines that engine speed has power generation conditions, stands
Rotary speed instruction is sent to ECU and high-voltage generator (5) control model is converted into power generation by driving, and ECU is according to nEngineCMDWith
The real-time revolving speed active accommodation oil spout frequency of the engine influenced by load of electrical generation realizes energy output；
T in above formulaCompDesDesired power generation torque during expression power compensation, the setting target of the expectation torque is to guarantee
Battery improves charge power as far as possible under the premise of not overcharging, while entire car controller (1) will pass through TStartMaxTo the target torque
It is limited；
T in above formulaComCMDThe power generation torque instruction that entire car controller (1) issues during expression power compensation, the instruction are being started
Machine fluctuation of speed size in the reasonable scope when with TCompDesSubject to, if engine speed fluctuations amplitude is more than zone of reasonableness, say
Bright high-voltage generator (5) power generation torque is larger, the unbearable load of the real-time injection pressure of engine, at this time entire car controller
(1) PID regulator is introduced, with noffsetTo control target, to TComCMDFeedback regulation is carried out, prevents engine speed from further dropping
It is low, so that engine speed is reached stable state；
Final State indicates the completion status of entire starting work in above formula, illustrates the building work of the high injection pressure of engine
It has been completed that, high-voltage generator (5) enters normal power generation working condition.
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Effective date of registration: 20211230 Address after: 100123 107, floor 1, building 2, courtyard 4, Changyi Road, Chaoyang District, Beijing Patentee after: Beijing Zhongchen Ruitong Technology Co.,Ltd. Address before: 430070 Hubei Province, Wuhan city Hongshan District Luoshi Road No. 122 Patentee before: WUHAN University OF TECHNOLOGY |