CN110466501A - Hybrid electric vehicle engine start-up and shut-down control method - Google Patents
Hybrid electric vehicle engine start-up and shut-down control method Download PDFInfo
- Publication number
- CN110466501A CN110466501A CN201910857109.XA CN201910857109A CN110466501A CN 110466501 A CN110466501 A CN 110466501A CN 201910857109 A CN201910857109 A CN 201910857109A CN 110466501 A CN110466501 A CN 110466501A
- Authority
- CN
- China
- Prior art keywords
- engine
- indicate
- cylinder
- bsg
- controller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
- B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W20/00—Control systems specially adapted for hybrid vehicles
- B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
- B60W20/11—Controlling the power contribution of each of the prime movers to meet required power demand using model predictive control [MPC] strategies, i.e. control methods based on models predicting performance
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/08—Electric propulsion units
- B60W2510/083—Torque
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Automation & Control Theory (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
A kind of hybrid electric vehicle engine start-up and shut-down control method, belongs to control technology field.The purpose of the present invention is practical using engine and desired rotational speed difference designs the error feedback controller based on Model Predictive Control, the start stop system controller for designing a feedforward plus feedback arrangement, realizes the hybrid electric vehicle engine start-up and shut-down control method of the steady quick start of engine.The present invention is first simplified nonlinear system, meanwhile, used control method does not need the firm constraints condition that too high while designed controller considers actuator part to the required precision of model.Controller used by simultaneously can overcome torque ripple big due to caused by gas compression in engine cylinder in start-up course very well, to realize that engine steadily quickly starts.
Description
Technical field
The invention belongs to control technology fields.
Background technique
The exactly temporary parking in vehicle travel process of engine start stop system (such as encounters red light or traffic congestion feelings
Condition), engine automatic stop, when receiving the instruction of driver's advance, system that engine starts automatically.In stringent political affairs
Under the fuel consumption and emission regulation of mansion, start stop system is smaller due to its lower cost and to the repacking of former vehicle, receives each
The concern of large manufacturer.Compared to orthodox car, the number of hybrid electric vehicle engine start and stop is more frequent, therefore engine opens
Higher requirements are also raised for the control performance of stop system, i.e. more rapidly smoothly starting.
Summary of the invention
The purpose of the present invention is practical using engine and desired rotational speed difference designs the error based on Model Predictive Control
Feedback controller designs the start stop system controller of a feedforward plus feedback arrangement, realizes the mixed of the steady quick start of engine
Close power vehicle engine start-up and shut-down control method.
Step of the invention is:
1. BSG start stop system to be built into the form of Lagrange's equation:
T indicates the kinetic energy of tape handler, can be obtained by following formula:
Wherein ωiFor indicating revolving speed, JiIndicate that rotary inertia, i=1 indicate that engine, i=2 indicate BSG motor,
P=kB(R1θ1-R2θ2)2 (3)
Wherein P indicates the potential energy of tape handler, R1Indicate engine crankshaft radius, R2Indicate BSG motor output shaft radius, kB
Indicate the equivalent stiffness of belt；
D=cB(R1ω1-R2ω2)2 (4)
Wherein D indicates the oissipation function of tape handler, cBIndicate the Equivalent damping coefficient of belt；
W=T1θ1+T2θ2 (5)
Wherein W indicates the function that tape handler is externally done, T1Indicate the engine start moment of resistance, T2Indicate that the output of BSG motor turns
Square；
2. it is as follows that arrangement can obtain BSG start stop system differential equation group:
3. since research object is the engine start stop system of BSG belt transmission, it is assumed that belt transmission is desired transmission:
R1θ1=R2θ2, R1ω1=R2ω2 (7)
BSG start stop system differential equation group can simplify are as follows:
Wherein TindIt is the engine start moment of resistance, TmIt is engine reciprocations moment of inertia, TfIt is engine friction torque；
4. engine not oil spout when due to starting estimates engine in-cylinder pressure by crank angle, so that estimation is by cylinder internal pressure
Resistance of start square caused by power changes, following formula are single-cylinder engine resistance of start square:
WhereinIt is connecting rod crank ratio, L is length of connecting rod, and r is crank throw；
5. in engine working process, from figure 3, it can be seen that the gas in the jar resistance to compression pression square that compares, engine start mistake
The reciprocal inertia force of journey is smaller, therefore is not very big on influence from the point of view of engine starting process, and reciprocal inertia force square is
Nonlinearity, so being ignored when designing controller:
Wherein Fin(θ1) indicate engine reciprocations inertia force, being calculate by the following formula can obtain:
MinIndicate the equivalent mass of reciprocating parts (including piston, connecting rod, piston pin etc.), x indicates the position of cylinder inner piston
It moves:
6. engine friction torque model:
Tf=k0+k1ω1+k2ω1 2 (13)
It is as follows according to the above-mentioned engine start and stop model for obtaining Control-oriented:
7. because by BSG motor drag engine start, so by Motor torque T2Control as system inputs, in order to weaken
Due to the diesel engine high-pressure contracting compression torque ripple bigger than in caused start-up course, BSG Motor torque is divided into a feedforward
Item adds feedback term i.e.:
T2=Tff+Tfb (15)
Wherein have:
Tff=-φ Tind (16)
When φ=1, then have:
From the course of work in engine cylinder:
8. it is not related to engine oil spout because start-up course is entirely to reach idling speed by motor drag engine, so
Assuming that being a pure adiabatic process in engine cylinder, ignore heat transmitting and heat transfer, it may be assumed that
Qn=0 (19)
Then there is pressure in engine cylinder may be expressed as:
Wherein VIVCIndicate the volume of engine when intake valve is closedPambIndicate extraneous standard atmospheric pressure, V
(θ1) indicate engine volume with the variation of crank angle, be shown below:
Wherein VcIndicate the clearance volume (combustion chamber volume) in engine cylinder, CrIndicate the compression ratio of engine:
In summary it can obtain, pressure formula in engine cylinder are as follows:
9. being directed to four-cylinder diesel engine, each cylinder phase phase difference of pi, according to cylinder acting sequence: 1-3-2-4 can obtain four cylinder diesel oil hair
Aerodynamic drag square caused by being compressed when motivation starts due to gas in the jar are as follows:
Tind=Tind1(θ1)+Tind2(θ1+π)+Tind3(θ1-π)+Tind4(θ1-2π) (24)
Have again,
It can be obtained after simplification:
10. by model Taylor's formula in desired engine speed ω0After place's linearisation, design based on Model Predictive Control
Feedback controller, the model after linearizing are as follows:
The state space equation of available engine start-stop control system are as follows:
Wherein quantity of state x is engine speed, controls variable u=TfbFor BSG motor torque, enabling output variable y=x is also hair
The tachometer value of motivation；
It is empty using state of the Eulerian equation to engine start-stop control system in order to meet the needs of model predictive controller design
Between equation carry out discretization, the selections sampling time be T, obtain it is discrete later incremental form system state equation are as follows:
Wherein,
C=1, D=0
Finally according to the system state equation obtained after abbreviation and transformation, mould is based on according to Model Predictive Control Algorithm design
The start stop system controller of type PREDICTIVE CONTROL, using the rotational speed difference between actual engine speed and expectation revolving speed as optimization aim,
The objective cost function designed is shown below:
J=| | Γy(Y(k+1|k)-R(k+1))||2+||ΓuΔU(k)||2 (32)
Γu,ΓyIt is the weighting coefficient of input item and output item；NuIt is that control time domain is chosen to be 5, N herepIt is that prediction time domain is same
Being chosen to be 5, R (k+1) is that engine it is expected revolving speed sequence；The maximum moment constraint of motor in torque optimization are as follows:
Using the designed calculated Motor torque of model predictive controller, joined by AMESim and MATLAB/Simulink
It closes emulation technology and is applied to BSG motor, realize that actual engine speed, the expectation revolving speed given in tracking start to realize
The steady start and stop of machine.
The present invention is first simplified nonlinear system, meanwhile, used control method wants the precision of model
Seek the firm constraints condition that too high while designed controller considers actuator part that do not need.Control used by simultaneously
Device processed can overcome torque ripple big due to caused by gas compression in engine cylinder in start-up course very well, to realize hair
Motivation steadily quickly starts.
Detailed description of the invention
Fig. 1 is to implement the engine start stop system control block diagram of the present invention based on feedforward plus feedback control method；
Fig. 2 is engine and BSG motor connecting structure schematic diagram in engine start stop system of the present invention；
Fig. 3 is the compression moment of resistance and reciprocal inertia force square correlation curve in the cylinder of engine in start stop system of the present invention,
Wherein dotted line indicates engine reciprocations moment of inertia, compresses the moment of resistance in the cylinder of real reciprocal inertia force square engine, unit is
Nm, abscissa are crankangle, and unit is degree
Fig. 4 is start-stop control system feedforward compensation controller structure chart of the present invention；
When Fig. 5 is that engine idle speed value of the present invention is set as 700rpm, it is expected to start after on off controller acts on
The correlation curve of machine revolving speed and practical engine speeds, wherein dotted line indicates desired engine speed, and solid line expression is actually started
Machine revolving speed, unit rpm, abscissa are time, unit s；
When Fig. 6 is that engine idle speed value of the present invention is set as 750rpm, it is expected to start after on off controller acts on
The correlation curve of machine revolving speed and practical engine speeds, wherein dotted line indicates desired engine speed, and solid line expression is actually started
Machine revolving speed, unit rpm, abscissa are time, unit s；
When Fig. 7 is that engine idle speed value of the present invention is set as 800rpm, it is expected to start after on off controller acts on
The correlation curve of machine revolving speed and practical engine speeds, wherein dotted line indicates desired engine speed, and solid line expression is actually started
Machine revolving speed, unit rpm, abscissa are time, unit s.
Specific embodiment
Main function of the present invention is namely based on measurement and obtains engine crankshaft corner information estimation start stop system by cylinder pressure production
The raw moment of resistance is to design feedforward compensation controller.
The present invention relates to a kind of engine start stop system control methods for adding error feedback control based on feedforward compensation, more
It says to body, the present invention is based on being pressed to generate the moment of resistance by cylinder in engine crankshaft corner estimation start-up course, designs feedforward compensation control
Device processed designs the error feedback controller based on Model Predictive Control, design one with desired rotational speed difference using engine is practical
The start stop system controller of a feedforward plus feedback arrangement, realizes the steady quick start of engine.
The present invention is directed to the control problem of the engine smooth starting of hybrid electric vehicle engine start stop system, according to drawing
Ge Lang establishing equation start stop system model adds starting for feedback arrangement by simplifying one feedforward of design using obtained model
It is jiggly can effectively to solve the problems, such as that engine frequent starting starts in the process for machine on off controller.It is of the present invention to grind
Studying carefully method functionally includes following two partial content: hybrid electric vehicle engine start stop system simulation model and start and stop control
Device processed.
Hybrid electric vehicle engine start-up and shut-down control of the present invention based on feedforward plus feedback control is to pass through
AMESim software and MATLAB/Simulink software associative simulation are realized.Using complex text layout engine platform software
AMESim simulates true hybrid electric vehicle engine start stop system, the different start operating performance of engine can be set, to simulate
The resistance of start square overcome in real engine start-up course；MATLAB/Simulink is imitative for designing start stop system controller
True mode is built, and controller includes feedforward compensation controller and feedback controller two parts group based on Model Predictive Control
At.Feedforward compensation controller is the gas compression moment of resistance in the engine cylinder based on engine crankshaft corner estimation, to compensate
The torque that engine starting process overcomes in-cylinder pressure to fluctuate；Feedback controller is to utilize the engine obtained from simulation model
Difference between actual speed and expectation revolving speed designs controller using simplified mechanism model, obtains electricity by optimizing operation
Machine output torque acts on the actual speed tracking expectation revolving speed that simulation model realizes engine.
Of the invention being implemented based on feedforward+feedback control hybrid electric vehicle engine start-up and shut-down control method is whole former
Block diagram is managed as shown in Figure 1, whole system includes two parts: controlled system model and controller model as seen from the figure.
Since the model of controlled device is using the model in AMESim, the present invention is not described in detail, and only provides master
The model parameter wanted is as shown in Table 1.
One start stop system engine parameter table of table
| Parameter | Numerical value |
| Length of connecting rod | 143.6mm |
| Engine strokes | 94.4mm |
| Engine compression ratio | 16.2 |
| Cylinder bore | 82mm |
| Crank throw | 47.2mm |
| Reference pressure | 101300Pa |
| Reference temperature | 293K |
Only consider the axial deformation of belt, belt is equivalent at a spring-damp system, while assuming the quality of belt
Can be ignored relative to pulley and there is no bending stiffness, assume further that two belt wheels are Synchronous Transmissions, i.e., belt and
It is not slided between pulley, engine and BSG motor connecting structure schematic diagram are as shown in Figure 2.
BSG start stop system can be built into the form of Lagrange's equation according to the conservation of energy:
T indicates the kinetic energy of tape handler, can be calculated by following formula:
Wherein ωiFor indicating revolving speed, JiIndicate that rotary inertia, i=1 indicate that engine, i=2 indicate BSG motor,
P=kB(R1θ1-R2θ2)2 (3)
Wherein P indicates the potential energy of tape handler, R1Indicate engine crankshaft radius, R2Indicate BSG motor output shaft radius, kB
Indicate the equivalent stiffness of belt.
D=cB(R1ω1-R2ω2)2 (4)
Wherein D indicates the oissipation function of tape handler, cBIndicate the Equivalent damping coefficient of belt
W=T1θ1+T2θ2 (5)
Wherein W indicates the function that tape handler is externally done, T1Indicate the engine start moment of resistance, T2Indicate that the output of BSG motor turns
Square.It is as follows that arrangement can obtain BSG start stop system differential equation group:
Since research object is the engine start stop system of BSG belt transmission, it is assumed that belt transmission is desired transmission:
R1θ1=R2θ2, R1ω1=R2ω2 (7)
BSG start stop system differential equation group can simplify are as follows:
Wherein TindIt is the engine start moment of resistance, TmIt is engine reciprocations moment of inertia, TfIt is engine friction torque.
Engine not oil spout when due to starting estimates engine in-cylinder pressure by crank angle, so that estimation is by cylinder
Resistance of start square caused by pressure change, following formula are single-cylinder engine resistance of start square:
WhereinIt is connecting rod crank ratio, L is length of connecting rod, and r is crank throw.
In engine working process, from figure 3, it can be seen that the gas in the jar resistance to compression pression square that compares, engine start
The reciprocal inertia force of process is smaller, therefore on influencing not being very big, and reciprocal inertia force square from the point of view of engine starting process
It is nonlinearity, so being ignored when designing controller:
Wherein Fin(θ1) indicate engine reciprocations inertia force, being calculate by the following formula can obtain:
MinIndicate the equivalent mass of reciprocating parts (including piston, connecting rod, piston pin etc.), x indicates the position of cylinder inner piston
It moves:
Engine friction torque model:
Tf=k0+k1ω1+k2ω1 2 (13)
It is as follows according to the above-mentioned engine start and stop model for obtaining Control-oriented:
Because by BSG motor drag engine start, so by Motor torque T2Control as system inputs, in order to cut
The weak compression torque ripple bigger than in caused start-up course due to diesel engine high-pressure contracting, before BSG Motor torque is divided into one
Feedback item adds feedback term i.e.:
T2=Tff+Tfb (15)
Wherein have:
Tff=-φ Tind (16)
When φ=1, then have:
From the course of work in engine cylinder:
Because start-up course is entirely to reach idling speed by motor drag engine, engine oil spout, institute it are not related to
To assume being a pure adiabatic process in engine cylinder, ignore heat transmitting and heat transfer, it may be assumed that
Qn=0 (19)
Then there is pressure in engine cylinder may be expressed as:
Wherein VIVCIndicate the volume of engine when intake valve is closedPambIndicate extraneous standard atmospheric pressure, V
(θ1) indicate engine volume with the variation of crank angle, be shown below:
Wherein VcIndicate the clearance volume (combustion chamber volume) in engine cylinder, CrIndicate the compression ratio of engine:
In summary it can obtain, pressure formula in engine cylinder are as follows:
For four-cylinder diesel engine, each cylinder phase phase difference of pi, according to cylinder acting sequence: 1-3-2-4 can obtain four cylinder diesel oil
Aerodynamic drag square caused by being compressed when engine start due to gas in the jar are as follows:
Tind=Tind1(θ1)+Tind2(θ1+π)+Tind3(θ1-π)+Tind4(θ1-2π) (24)
Have again,
It can be obtained after simplification:
By model Taylor's formula in desired engine speed ω0After place's linearisation, design is based on Model Predictive Control
Feedback controller, the model after linearizing are as follows:
The state space equation of available engine start-stop control system are as follows:
Wherein quantity of state x is engine speed, controls variable u=TfbFor BSG motor torque, enabling output variable y=x is also hair
The tachometer value of motivation.
In order to meet the needs of model predictive controller design, using Eulerian equation to the shape of engine start-stop control system
State space equation carries out discretization, and the selection sampling time is T, obtains the system state equation of discrete incremental form later are as follows:
Wherein,
C=1, D=0 (31)
Finally according to the system state equation obtained after abbreviation and transformation, it is based on according to Model Predictive Control Algorithm design
The start stop system controller of Model Predictive Control is optimization mesh with the rotational speed difference between actual engine speed and expectation revolving speed
Mark, the objective cost function designed are shown below:
J=| | Γy(Y(k+1|k)-R(k+1))||2+||ΓuΔU(k)||2 (32)
Γu,ΓyIt is the weighting coefficient of input item and output item.NuIt is that control time domain is chosen to be 5, N herepIt is that prediction time domain is same
Being chosen to be 5, R (k+1) is that engine it is expected revolving speed sequence.The maximum moment constraint of motor in torque optimization are as follows:
Using the designed calculated Motor torque of model predictive controller, pass through AMESim and MATLAB/
Simulink associative simulation technology is applied to BSG motor, realizes actual engine speed, the expectation revolving speed given in tracking, from
And realize the steady start and stop of engine.
Experimental verification
In order to further verify the control performance of engine start stop system controller, change the engine phase in start stop system model
Hope the size of idling speed and other parameters are constant has carried out performance verification to start stop system controller.According to the hair of different model
Motivation idle speed value may be different, and the present invention selectes 700rpm, and tri- groups of idle speed values of 750rpm, 800rpm concurrently set electricity
Machine maximum is turned round
Square range is -118~118Nm, the simulation result arrived such as Fig. 5, shown in 6,7.
By simulation result diagram it is found that by off controller effect, engine may be implemented to be rapidly achieved hair in 0.3s or so
Motivation idling speed, and stablize near idling speed, while the situation different for engine idle speed value, designed by the present invention
On off controller is with good stability, can realize the quick and stable starting of engine.
Claims (1)
1. a kind of hybrid electric vehicle engine start-up and shut-down control method, it is characterised in that: the steps include:
1. BSG start stop system to be built into the form of Lagrange's equation:
T indicates the kinetic energy of tape handler, can be obtained by following formula:
Wherein ωiFor indicating revolving speed, JiIndicate that rotary inertia, i=1 indicate that engine, i=2 indicate BSG motor,
P=kB(R1θ1-R2θ2)2 (3)
Wherein P indicates the potential energy of tape handler, R1Indicate engine crankshaft radius, R2Indicate BSG motor output shaft radius, kB
Indicate the equivalent stiffness of belt；
D=cB(R1ω1-R2ω2)2 (4)
Wherein D indicates the oissipation function of tape handler, cBIndicate the Equivalent damping coefficient of belt；
W=T1θ1+T2θ2 (5)
Wherein W indicates the function that tape handler is externally done, T1Indicate the engine start moment of resistance, T2Indicate that the output of BSG motor turns
Square；
2. it is as follows that arrangement can obtain BSG start stop system differential equation group:
3. since research object is the engine start stop system of BSG belt transmission, it is assumed that belt transmission is desired transmission:
R1θ1=R2θ2, R1ω1=R2ω2 (7)
BSG start stop system differential equation group can simplify are as follows:
Wherein TindIt is the engine start moment of resistance, TmIt is engine reciprocations moment of inertia, TfIt is engine friction torque；
4. engine not oil spout when due to starting estimates engine in-cylinder pressure by crank angle, so that estimation is by cylinder internal pressure
Resistance of start square caused by power changes, following formula are single-cylinder engine resistance of start square:
WhereinIt is connecting rod crank ratio, L is length of connecting rod, and r is crank throw；
5. in engine working process, from figure 3, it can be seen that the gas in the jar resistance to compression pression square that compares, engine start mistake
The reciprocal inertia force of journey is smaller, therefore is not very big on influence from the point of view of engine starting process, and reciprocal inertia force square is
Nonlinearity, so being ignored when designing controller:
Wherein Fin(θ1) indicate engine reciprocations inertia force, being calculate by the following formula can obtain:
MinIndicate the equivalent mass of reciprocating parts (including piston, connecting rod, piston pin etc.), x indicates the displacement of cylinder inner piston:
6. engine friction torque model:
Tf=k0+k1ω1+k2ω1 2 (13)
It is as follows according to the above-mentioned engine start and stop model for obtaining Control-oriented:
7. because by BSG motor drag engine start, so by Motor torque T2Control as system inputs, in order to weaken
Due to the diesel engine high-pressure contracting compression torque ripple bigger than in caused start-up course, BSG Motor torque is divided into a feedforward
Item adds feedback term i.e.:
T2=Tff+Tfb (15)
Wherein have:
Tff=-φ Tind (16)
When φ=1, then have:
From the course of work in engine cylinder:
8. it is not related to engine oil spout because start-up course is entirely to reach idling speed by motor drag engine, so
Assuming that being a pure adiabatic process in engine cylinder, ignore heat transmitting and heat transfer, it may be assumed that
Qn=0
(19)
Then there is pressure in engine cylinder may be expressed as:
Wherein VIVCIndicate the volume of engine when intake valve is closedPambIndicate extraneous standard atmospheric pressure, V
(θ1) indicate engine volume with the variation of crank angle, be shown below:
Wherein VcIndicate the clearance volume (combustion chamber volume) in engine cylinder, CrIndicate the compression ratio of engine:
In summary it can obtain, pressure formula in engine cylinder are as follows:
9. being directed to four-cylinder diesel engine, each cylinder phase phase difference of pi, according to cylinder acting sequence: 1-3-2-4 can obtain four cylinder diesel oil hair
Aerodynamic drag square caused by being compressed when motivation starts due to gas in the jar are as follows:
Tind=Tind1(θ1)+Tind2(θ1+π)+Tind3(θ1-π)+Tind4(θ1-2π) (24)
Have again,
It can be obtained after simplification:
10. by model Taylor's formula in desired engine speed ω0After place's linearisation, design based on the anti-of Model Predictive Control
Present controller, the model after linearizing are as follows:
The state space equation of available engine start-stop control system are as follows:
Wherein quantity of state x is engine speed, controls variable u=TfbFor BSG motor torque, enabling output variable y=x is also to start
The tachometer value of machine；
It is empty using state of the Eulerian equation to engine start-stop control system in order to meet the needs of model predictive controller design
Between equation carry out discretization, the selections sampling time be T, obtain it is discrete later incremental form system state equation are as follows:
Wherein,
Finally according to the system state equation obtained after abbreviation and transformation, mould is based on according to Model Predictive Control Algorithm design
The start stop system controller of type PREDICTIVE CONTROL, using the rotational speed difference between actual engine speed and expectation revolving speed as optimization aim,
The objective cost function designed is shown below:
J=| | Γy(Y(k+1|k)-R(k+1))||2+||ΓuΔU(k)||2 (32)
Γu,ΓyIt is the weighting coefficient of input item and output item；NuIt is that control time domain is chosen to be 5, N herepIt is that prediction time domain is same
Being chosen to be 5, R (k+1) is that engine it is expected revolving speed sequence；The maximum moment constraint of motor in torque optimization are as follows:
Using the designed calculated Motor torque of model predictive controller, joined by AMESim and MATLAB/Simulink
It closes emulation technology and is applied to BSG motor, realize that actual engine speed, the expectation revolving speed given in tracking start to realize
The steady start and stop of machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857109.XA CN110466501B (en) | 2019-09-11 | 2019-09-11 | Hybrid electric vehicle engine start-stop control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910857109.XA CN110466501B (en) | 2019-09-11 | 2019-09-11 | Hybrid electric vehicle engine start-stop control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110466501A true CN110466501A (en) | 2019-11-19 |
| CN110466501B CN110466501B (en) | 2021-02-09 |
Family
ID=68515514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910857109.XA Active CN110466501B (en) | 2019-09-11 | 2019-09-11 | Hybrid electric vehicle engine start-stop control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110466501B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115143006A (en) * | 2022-05-26 | 2022-10-04 | 哈尔滨东安汽车发动机制造有限公司 | Engine start-stop control system based on DHT framework hybrid power system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105863841A (en) * | 2016-05-23 | 2016-08-17 | 上海海事大学 | Method for conducting angle encoding on instantaneous pressure in engine cylinder |
| CN106274885A (en) * | 2016-08-31 | 2017-01-04 | 安徽江淮汽车股份有限公司 | Vehicle on off control method |
| US20170050631A1 (en) * | 2015-08-19 | 2017-02-23 | Cummins Inc. | Engine start/stop control system and method |
| CN108313059A (en) * | 2018-03-28 | 2018-07-24 | 浙江吉利汽车研究院有限公司 | Engine start-up and shut-down control method, apparatus and system |
-
2019
- 2019-09-11 CN CN201910857109.XA patent/CN110466501B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170050631A1 (en) * | 2015-08-19 | 2017-02-23 | Cummins Inc. | Engine start/stop control system and method |
| CN105863841A (en) * | 2016-05-23 | 2016-08-17 | 上海海事大学 | Method for conducting angle encoding on instantaneous pressure in engine cylinder |
| CN106274885A (en) * | 2016-08-31 | 2017-01-04 | 安徽江淮汽车股份有限公司 | Vehicle on off control method |
| CN108313059A (en) * | 2018-03-28 | 2018-07-24 | 浙江吉利汽车研究院有限公司 | Engine start-up and shut-down control method, apparatus and system |
Non-Patent Citations (1)
| Title |
|---|
| GIOVANNI INCERTI: "A Model for Analyzing the Startup Dynamics of a Belt Transmission Driven by a DC Motor", 《INTERNATIONAL JOURNAL OF MECHANICAL, AEROSPACE, INDUSTRIAL, MECHATRONIC AND MANUFACTURING ENGINEERING》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115143006A (en) * | 2022-05-26 | 2022-10-04 | 哈尔滨东安汽车发动机制造有限公司 | Engine start-stop control system based on DHT framework hybrid power system |
| CN115143006B (en) * | 2022-05-26 | 2024-01-23 | 哈尔滨东安汽车发动机制造有限公司 | Engine start-stop control system based on DHT framework hybrid power system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110466501B (en) | 2021-02-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105651524B (en) | Auto test bed engine torsion analogy method | |
| Canova et al. | On the control of engine start/stop dynamics in a hybrid electric vehicle | |
| Casoli et al. | Development and application of co-simulation and “control-oriented” modeling in the improvement of performance and energy saving of mobile machinery | |
| CN109795470A (en) | A kind of dynamical system active damping method based on motor instant torque observer | |
| CN110770427A (en) | Method for detecting a current correction value of an inlet section of a combustion motor during operation | |
| Panting et al. | Turbocharger motor-generator for improvement of transient performance in an internal combustion engine | |
| CN110466501A (en) | Hybrid electric vehicle engine start-up and shut-down control method | |
| CN113428158B (en) | Internal combustion engine type range extender torsional vibration hybrid control method | |
| CN107893706B (en) | Continuous variable valve system and control method thereof | |
| Han et al. | Model predictive control of diesel engine start-stop control in an HEV | |
| CN101555840B (en) | Systems and methods for predicting engine delta friction torque using both coolant and oil temperature | |
| Dönitz et al. | Validation of the fuel saving potential of downsized and supercharged hybrid pneumatic engines using vehicle emulation experiments | |
| CN112855363B (en) | Range extender, control method and vehicle | |
| CN112818520B (en) | Vibration signal-based FPLG control strategy simulation model construction method and system | |
| Lahti et al. | A transient test system for single cylinder research engines with real time simulation of multi-cylinder crankshaft and intake manifold dynamics | |
| CN114151191A (en) | Decoupling design method of internal combustion constraint linear power generation system | |
| Dolcini | Contribution to the clutch comfort | |
| Bey et al. | Downsizing concept with two-cylinder CNG engine | |
| Li et al. | Air path system control of turbocharged gasoline engine based on fuzzy PID | |
| Rajamani et al. | Mean value modeling of SI and diesel engines | |
| CN112761782A (en) | Free piston linear generator motion characteristic simulation analysis method and system | |
| Mu et al. | Study with fuzzy self-turning PID controller on idle speed controlling of automobile | |
| Canova et al. | Control of the start/stop of a diesel engine in a parallel HEV: Modeling and experiments | |
| CN114151216B (en) | Active vibration damping control method and device based on cylinder pressure reconstruction | |
| Wilbanks et al. | Experimental Apparatus for Assessing the Nonlinear Dynamics of Engine Restart and Shutdown |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |