CN110103946A - A kind of engine start control method for mixed power automobile and system - Google Patents
A kind of engine start control method for mixed power automobile and system Download PDFInfo
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- CN110103946A CN110103946A CN201910312575.XA CN201910312575A CN110103946A CN 110103946 A CN110103946 A CN 110103946A CN 201910312575 A CN201910312575 A CN 201910312575A CN 110103946 A CN110103946 A CN 110103946A
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- 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
- B60W10/02—Conjoint control of vehicle sub-units of different type or different function including control of driveline clutches
-
- 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
- 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
- B60W10/08—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of electric propulsion units, e.g. motors or generators
-
- 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
-
- 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
- B60W2510/02—Clutches
- B60W2510/0208—Clutch engagement state, e.g. engaged or disengaged
-
- 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
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- 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
- B60W2510/10—Change speed gearings
- B60W2510/1005—Transmission ratio engaged
-
- 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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0644—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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0666—Engine torque
-
- 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
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/08—Electric propulsion units
- B60W2710/083—Torque
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/62—Hybrid vehicles
Abstract
The present invention relates to a kind of engine start control method for mixed power automobile and systems, the described method comprises the following steps: determining the starting gear of engine, the rotating speed of target of engine is obtained according to the starting gear;Control clutch is in sliding state of rubbing, and judges whether clutch enters dbjective state;After the clutch enters dbjective state, the current rotating speed of engine is obtained, judges whether the current rotating speed is not less than the rotating speed of target;If the current rotating speed is not less than the rotating speed of target, controls oil spout igniting and run the engine;If the current rotating speed is less than the rotating speed of target, the target torque and slope of the clutch are obtained according to the current rotating speed, control the starting torque that the clutch engages and limits the clutch according to the target torque and slope.The present invention realizes the ride comfort for starting engine under electric drive driving status, and ensure that engine starting process.
Description
Technical field
The present invention relates to Development of HEV Technology field, in particular to a kind of hybrid electric vehicle engine starting control
Method and system.
Background technique
With Global Auto industrial expansion, yield, sales volume and the ownership of automobile are also increasing year by year, but due to working as
There is various disadvantages such as discharge exhaust gas, pollution environment, energy-saving and environment-friendly new energy for the preceding fuel engines automobile generally used
Automobile has gradually developed and starts replacing fuel oil engine automobile.Since pure electric automobile is short there are continual mileage and charging is slow
The problem of, hybrid vehicle becomes the focus and development point of auto industry.It, can be with during hybrid electric vehicle is sailed
Vehicle is promoted using multiple power sources instead of engine power, so that vehicle minimizes the dependence of engine power, mixing
Power vehicle can use electric energy etc. to drive vehicle, for example, can drive vehicle using one or more motors, pass through electricity
The independent operating of machine realizes the driving to vehicle with cooperating for fuel engines.
Technological difficulties in hybrid vehicle are in the control of engine start and stop, especially driving process to drive from pure electricity
It is dynamic to be switched to engine-driven control.When power demand is bigger in vehicle travel process, the function of motor offer is relied only on
Rate is unable to satisfy the power demand of hybrid vehicle, can star engine, common by engine or engine and motor
Power is provided for vehicle.But the process for starting engine in pure electricity traveling at present does not account for engine water temperature for clutch
The factors such as friction of engine, are easy to cause engine starting process to start when device starts the influence and starting of target torque
Power loss and the problems such as irregularity when impact, starting failure, starting.
Summary of the invention
In view of the above problems in the prior art, the purpose of the present invention is to provide a kind of startings of hybrid electric vehicle engine
Control method and system, power loss and not when being able to solve starting impact in engine starting process, starting failure, starting
Smooth problem.
To solve the above-mentioned problems, the present invention provides a kind of engine start control method for mixed power automobile, including with
Lower step:
S1, the starting gear for determining engine obtain the rotating speed of target of engine according to the starting gear;
S2, control clutch are in sliding state of rubbing, and judge whether clutch enters dbjective state;
S3, after the clutch enters dbjective state, obtain the current rotating speed of engine, judge that the current rotating speed is
It is no to be not less than the rotating speed of target;
If S4, the current rotating speed are not less than the rotating speed of target, control oil spout igniting and run the engine;
If S5, the current rotating speed are less than the rotating speed of target, the clutch is obtained according to the current rotating speed
Target torque and slope, control the clutch and engage and limit opening for the clutch according to the target torque and slope
Dynamic torque returns to step S3.
Further, the target torque for obtaining the clutch includes:
The timing since when the clutch enters dbjective state, before timing time reaches the first setting time T1,
Target torque of the first object torque as clutch is obtained, the first object torque is according to Clutch input shaft revolving speed, hair
Current rotating speed, engine water temperature, engine friction torque loss and the engine pump gas costing bio disturbance of motivation obtain;Work as timing
After time reaches the first setting time T1, target torque of second target torque as clutch, second target are obtained
Torque is inquired from the first tables of data according to the current rotating speed of engine and is obtained, and first tables of data is for recording engine
The mapping relations of current rotating speed and the second target torque.
Further, the acquisition slope include: from the second tables of data inquiry obtain it is corresponding with the current rotating speed
Slope, the slope include the first slope when the current rotating speed is less than setting speed, and when the current rotating speed is big
The second slope when being equal to setting speed, second slope are greater than the first slope;
It is described that obtain the rotating speed of target of engine according to the starting gear include: according to the starting gear from third number
Rotating speed of target corresponding with the starting gear is obtained according to inquiry in table, the third tables of data is for recording the starting gear
With the mapping relations of the rotating speed of target of engine.
Further, it is described judge clutch whether into dbjective state include:
Control clutch, which is in slide, starts timing when rubbing state, records the timing time;
Obtain the actual torque for starting the clutch;
Judge whether the timing time and the actual torque meet setting condition;
It imposes a condition if the timing time and the actual torque meet, determines that the clutch enters target-like
State;
If the timing time and the actual torque are unsatisfactory for imposing a condition, determine that the clutch does not enter target
State.
Specifically, described to judge whether the timing time and the actual torque meet setting condition and include:
When the actual torque reaches the second setting not less than the torque of the half-clutch point of setting or the timing time
When time T2, determines that the timing time and the actual torque meet and impose a condition;
When the actual torque is less than the torque of the half-clutch point of setting and the timing time is not up to the second setting
Between T2 when, determine that the timing time and the actual torque are unsatisfactory for imposing a condition.
Further, the method also includes steps:
Obtain the current output torque of motor of hybrid power automobile;
Motor torque penalty coefficient is obtained according to the starting gear;
Motor compensating torque is calculated according to the target torque and the Motor torque penalty coefficient;
It is exported according to the torque of the current output torque of the motor and the motor compensating torque control motors.
Specifically, it is described according to the starting gear obtain Motor torque penalty coefficient include: according to the starting gear
Inquiry obtains Motor torque penalty coefficient corresponding with the starting gear from the 4th tables of data, and the 4th tables of data is used for
Record the mapping relations of the starting gear and the Motor torque penalty coefficient;
It is described according to the target torque and the Motor torque penalty coefficient calculate motor compensating torque include: obtain it is mixed
Speed changer base ratio, transmission gear speed ratio and the driving motor of power vehicle are closed to road wheel end speed ratio;Calculate motor compensating
Torque, calculation formula are as follows:
Motor compensating torque=(target torque × Motor torque penalty coefficient) × (speed changer base ratio × speed changer shelves
Position speed ratio) ÷ driving motor is to road wheel end speed ratio.
Further, the method also includes:
Before engine start, the current vehicle speed of hybrid vehicle is obtained;
It is inquired from the 5th tables of data according to the current vehicle speed and obtains motor output torsion corresponding with the current vehicle speed
The threshold value of square, the threshold value are less than the total torque of the motor, and the 5th tables of data is for recording the current vehicle speed and institute
State the mapping relations of threshold value;
The output torque for controlling the motor is no more than the threshold value.
The present invention also provides a kind of hybrid electric vehicle engines to start control system, for realizing above-mentioned hybrid power
Automobile engine starting control method, the system comprises detection module, gearbox control, engine controller, motor controls
Device and entire car controller processed;
The detection module is electrically connected with the entire car controller, and the detection module is used to detect the parameter information of automobile
And it is sent to the entire car controller;
Parameter information carries out logical operation and judgement to the entire car controller based on the received, and controls to the gearbox
Device, engine controller and electric machine controller issue control instruction;
The control instruction control clutch engagement that the gearbox control is sent according to the entire car controller;
The engine controller is lighted a fire to engine oil spout according to the control instruction that the entire car controller is sent and is carried out
Control;
The torque for the control instruction control motor that the electric machine controller is sent according to the entire car controller exports.
Further, the detection module includes torque sensor, engine speed sensor, Clutch input shaft revolving speed
Sensor and temperature sensor.
Due to above-mentioned technical proposal, the invention has the following advantages:
(1) a kind of engine start control method for mixed power automobile of the invention, which is increased, enters target-like to clutch
The time judgement of state and the time of engine start judge, it is ensured that engine start does not postpone, and avoids asking for starting failure
Topic.
(2) a kind of engine start control method for mixed power automobile of the invention considers engine water temperature, engine
The influence of friction loss, engine pumping loss to clutch starting target torque, so that can obtain most in varied situations
Suitable clutch starts target torque, so that engine start is more smooth.
(3) a kind of engine start control method for mixed power automobile of the invention is increased to clutch starting torque
Slop control uses the different increased slopes of control clutch starting torque based on different engine current rotating speeds, so that
Engine start is more smooth.
(4) a kind of engine start control method for mixed power automobile of the invention increases in engine starting process
The output of motor compensating torque reduces the power loss in engine starting process, ensure that the ride comfort of engine start.
(5) a kind of engine start control method for mixed power automobile of the invention is increased before an engine is started to hair
The limitation of motivation output torque has reserved sufficient motor reserve torque, it is ensured that motor is capable of providing foot when engine start
Enough motor compensating torques, ensure that the ride comfort of engine start.
Detailed description of the invention
It, below will be to required in embodiment or description of the prior art in order to illustrate more clearly of technical solution of the present invention
The attached drawing used is briefly described.It should be evident that drawings in the following description are only some embodiments of the invention, it is right
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Its attached drawing.
Fig. 1 is a kind of engine start control method for mixed power automobile flow chart provided in an embodiment of the present invention;
Fig. 2 is a kind of mixed power system structure schematic diagram of P2.5 framework based on DCT provided in an embodiment of the present invention;
Fig. 3 be a kind of engine start control method for mixed power automobile provided in an embodiment of the present invention judge clutch into
Enter the logic chart of dbjective state;
Fig. 4 is that a kind of engine start control method for mixed power automobile provided in an embodiment of the present invention obtains patrolling for slope
Collect figure;
Fig. 5 is that a kind of engine start control method for mixed power automobile provided in an embodiment of the present invention obtains clutch
The logic chart of target torque;
Fig. 6 is that a kind of engine start control method for mixed power automobile provided in an embodiment of the present invention calculates motor compensating
The logic chart of torque;
Fig. 7 is a kind of engine start control method for mixed power automobile motor reserve torque provided in an embodiment of the present invention
Control logic figure;
Fig. 8 is a kind of hybrid electric vehicle engine starting control system architecture schematic diagram provided in an embodiment of the present invention.
In figure: 1- engine, 2- clutch, 3- motor, 4- dual-clutch transmission, 5- vehicle and half axle assembly.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without making creative work it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
Embodiment 1
Reference book attached drawing 1 to Fig. 7, the present embodiment provides a kind of engine start control method for mixed power automobile,
The control method can be applied in the hybrid power system of the P2.5 framework based on DCT, and the hybrid power system includes
1, two clutch 2 of engine, motor 3, dual-clutch transmission 4 and vehicle and half axle assembly 5 have the hybrid power system
When the automobile of system needs to start engine in pure electric driving process, the starting of clutch 2 that can be used on non-motor shaft is started
Machine, the clutch 2 that also can be used on motor shaft start engine.
The engine start control method for mixed power automobile the following steps are included:
Automobile parameters information is obtained, judges whether automobile needs to start engine according to the parameter information.
Specifically, the parameter information includes: accelerator pedal of automobile aperture, battery level information, vehicle speed information, engine
Water temperature information, motor system fault information, battery system fault message, DC/DC (Direct Current/Direct
Current, high voltage/low voltage DC converting are low pressure/high voltage direct current) system failure information, unused engine hours, warm wind need
Ask power, battery pack temperature information etc..When there are the situation of any one in following situations, judges that automobile needs to start and start
Machine:
In pure electric driving process, since driver's accelerator pedal accelerates, automobile demand wheel power be greater than motor this
When the maximum wheel power that can provide, it is desirable that starting engine carries out power compensation;
When battery power consumption to lower value (can be demarcated based on battery behavior), it is desirable that starting engine is to battery
It charges;
Speed is higher (this speed can be demarcated based on different engines and motor), and electric efficiency is lower to start simultaneously
When engine efficiency is higher, it is desirable that starting engine;
When engine water temperature is too low, need to start engine to carry out warming-up;
There are when failure for electric system, battery system or DC/DC system etc., it is desirable that starting engine;
Fuel oil aging (be not used for a long time engine), it is desirable that starting engine to refueling again;
Warm wind demand power is greater than PTC (Positive Temperature Coefficient, positive temperature in winter cockpit
Degree coefficient) heater be capable of providing power when, it is desirable that engine start carry out warming-up heating;
When battery pack temperature is lower, needs to start engine and heated.
It should be noted that above-mentioned several situations are citing to the case where starting engine is needed, in practical application
It can also include the case where that other need to start engine.Increase can reduce engine to the judgement of engine start condition and open
The starting impact of dynamic process, avoids the occurrence of the problem of starting fails.
S1, the starting gear for determining engine obtain the rotating speed of target of engine according to the starting gear.
In the real-time example of the present invention, when needing to start engine, it can be determined according to gas pedal aperture and vehicle speed information
The starting gear of engine;The rotating speed of target according to the starting gear acquisition engine includes: according to the starting shelves
Position inquiry from third tables of data obtains rotating speed of target corresponding with the starting gear, and the third tables of data is for recording institute
State the mapping relations of the rotating speed of target of starting gear and engine.
Automobile parameters information is obtained, judges whether to need to start clutch according to the parameter information.
Specifically, the parameter information includes: vehicle speed information, automobile current gear information, two axis of dual-clutch transmission
Gear information, engine condition information, gear fault message of speed changer starting etc..When meeting following all conditions, judgement
It needs to start clutch:
Current driving speed is greater than the minimum speed of setting, and low speed will be unable to avoid using clutch to start engine
Starting impact and starting failure;
Current shift is judged as D (Drive advances) shelves or R (Reverse, reversing) shelves;
Two axis of dual-clutch transmission must hang shelves, can be 2 grades, 4 grades, 6 grades or R grades;
Engine condition is shutdown status or is shutting down;
The gear of speed changer starting is available, without failure.
It is rushed it should be noted that increasing the starting that can reduce engine starting process to the judgement of clutch entry condition
The problem of hitting, avoiding the occurrence of starting failure.
S2, control clutch are in sliding state of rubbing, and judge whether clutch enters dbjective state.
In the embodiment of the present invention, when needing to activate the clutch to starting engine, half-clutch point can be preset
The torque of (kiss point point), the torque of the half-clutch point are a lesser torque value.Preferably, the half-clutch point
Torque can be 1Nm.
In the embodiment of the present invention, it is described judge clutch whether into dbjective state include:
Control clutch, which is in slide, starts timing when rubbing state, records the timing time;
The actual torque for starting the clutch is obtained, specifically, the actual torque can be by being installed on clutch
Torque sensor on input shaft directly obtains;
Judge whether the timing time and the actual torque meet setting condition;
It imposes a condition if the timing time and the actual torque meet, determines that the clutch enters target-like
State;
If the timing time and the actual torque are unsatisfactory for imposing a condition, determine that the clutch does not enter target
State.
Wherein, described to judge whether the timing time and the actual torque meet setting condition and include:
When the actual torque reaches the second setting not less than the torque of the half-clutch point of setting or the timing time
When time T2, determines that the timing time and the actual torque meet and impose a condition;
When the actual torque is less than the torque of the half-clutch point of setting and the timing time is not up to the second setting
Between T2 when, determine that the timing time and the actual torque are unsatisfactory for imposing a condition.
It should be noted that the purpose for judging whether clutch enters dbjective state has two o'clock: first is that avoid opening
When dynamic just beginning, since clutch causes starting to impact by being opened to unexpected being fully engaged;Third is that determining that starting clutch is real
The datum mark of border torque, what clutch actual torque can be parallel in formal start-up course follows clutch target torque,
Ensure in entire start-up course, clutch actual torque does not occur too high or too low the problem of causing starting to impact or fail.
S3, after the clutch enters dbjective state, obtain the current rotating speed of engine, judge that the current rotating speed is
It is no to be not less than the rotating speed of target.
In the embodiment of the present invention, the current rotating speed of the engine can be by the speed probe that is installed on engine
It directly acquires.
If S4, the current rotating speed are not less than the rotating speed of target, control oil spout igniting and run the engine.
If S5, the current rotating speed are less than the rotating speed of target, the clutch is obtained according to the current rotating speed
Target torque and slope, control the clutch and engage and limit opening for the clutch according to the target torque and slope
Dynamic torque returns to step S3.
In the embodiment of the present invention, the target torque for obtaining the clutch includes:
The timing since when the clutch enters dbjective state, before timing time reaches the first setting time T1,
Target torque of the first object torque as clutch is obtained, the first object torque is according to Clutch input shaft revolving speed, hair
Current rotating speed, engine water temperature, engine friction torque loss and the engine pump gas costing bio disturbance of motivation obtain;Work as timing
After time reaches the first setting time T1, target torque of second target torque as clutch, second target are obtained
Torque is inquired from the first tables of data according to the current rotating speed of engine and is obtained, and first tables of data is for recording engine
The mapping relations of current rotating speed and the second target torque.
In the embodiment of the present invention, the Clutch input shaft revolving speed can be by the revolving speed that is set on Clutch input shaft
Sensor directly acquires, and the engine water temperature can be directly acquired by the temperature sensor being installed on engine water tank,
The engine friction torque loss can be calculated by the current rotating speed of engine and the charge flow rate of engine, described
Engine pumping loss can be determined by engine back pressure, engine charge pressure and charge flow rate.First mesh
Mark torque can calculate by the following method: first by the difference of the Clutch input shaft revolving speed and the current rotating speed with
The engine water temperature obtains the basic starting torque of clutch, then with engine friction torque loss, described start
Machine pumping loss sums to obtain the first object torque.
The acquisition slope includes: the inquiry acquisition slope corresponding with the current rotating speed from the second tables of data, described
Slope includes the first slope when the current rotating speed is less than setting speed, and when the current rotating speed is more than or equal to setting
The second slope when revolving speed, second slope are greater than the first slope.
Further, the method also includes steps:
Obtain the current output torque of motor of hybrid power automobile;
Motor torque penalty coefficient is obtained according to the starting gear;
Motor compensating torque is calculated according to the target torque and the Motor torque penalty coefficient;
It is exported according to the torque of the current output torque of the motor and the motor compensating torque control motors.
In the embodiment of the present invention, the current output torque of the motor can be by the torque that is set on motor output shaft
Sensor directly acquires;
It is described that obtain Motor torque penalty coefficient according to the starting gear include: several from the 4th according to the starting gear
Motor torque penalty coefficient corresponding with the starting gear is obtained according to inquiry in table, the 4th tables of data is described for recording
Start the mapping relations of gear and the Motor torque penalty coefficient;
It is described according to the target torque and the Motor torque penalty coefficient calculate motor compensating torque include: obtain it is mixed
Speed changer base ratio, transmission gear speed ratio and the driving motor of power vehicle are closed to road wheel end speed ratio;Calculate motor compensating
Torque, calculation formula are as follows:
Motor compensating torque=(target torque × Motor torque penalty coefficient) × (speed changer base ratio × speed changer shelves
Position speed ratio) ÷ driving motor is to road wheel end speed ratio.
Specifically, the speed changer base ratio, the transmission gear speed ratio and driving motor are equal to road wheel end speed ratio
It can be directly acquired by the dynamical system of automobile.
Come it should be noted that the engine start control method increases motor compensating torque in engine startup
The reason of motor driving torque in compensation engine starting process loses is: since the starting control method passes through vehicle
Inertia force, in conjunction with clutch by engine speed from it is static it is counter be dragged to rotating speed of target, the acceleration of vehicle can be during this
It is flown up again after startup stage drop start completion, causes vehicle starting shake.
Further, the method also includes:
Before engine start, the current vehicle speed of hybrid vehicle is obtained;
It is inquired from the 5th tables of data according to the current vehicle speed and obtains motor output torsion corresponding with the current vehicle speed
The threshold value of square, the threshold value are less than the total torque of the motor, and the 5th tables of data is for recording the current vehicle speed and institute
State the mapping relations of threshold value;
The output torque for controlling the motor is no more than the threshold value.
It should be noted that when the low speed of low gear starts engine, bigger motor is needed to mend when automobile is on ramp
Torque is repaid come the ride comfort of vehicle when guaranteeing to start engine, but it sometimes appear that motor torque capability is unable to satisfy compensation torsion
The case where square requires;Therefore the engine start control method is while the car is driving before engine start, based on difference
Speed sets the threshold value of different motor output torques, that is, sets different motor reserve torques, it is ensured that electric when engine start
Machine is capable of providing enough motor compensating torques, wherein the motor total torque and the difference of motor output torque threshold value are
Preset motor reserve torque.
It should be noted that motor total torque that can be different according to hybrid vehicle, sets different motor output
The threshold value of torque.
Embodiment 2
Reference book attached drawing 8, the present embodiment provides a kind of hybrid electric vehicle engines to start control system, for real
Existing above-mentioned engine start control method for mixed power automobile, the system comprises detection module, gearbox control, starts
Machine controller, electric machine controller and entire car controller;
The detection module is electrically connected with the entire car controller, and the detection module is used to detect the parameter information of automobile
And it is sent to the entire car controller;
Parameter information carries out logical operation and judgement to the entire car controller based on the received, and controls to the gearbox
Device, engine controller and electric machine controller issue control instruction;
The control instruction control clutch engagement that the gearbox control is sent according to the entire car controller;
The engine controller is lighted a fire to engine oil spout according to the control instruction that the entire car controller is sent and is carried out
Control;
The torque for the control instruction control motor that the electric machine controller is sent according to the entire car controller exports.
In the embodiment of the present invention, the detection module may include torque sensor, engine speed sensor, clutch
Input shaft rotating speed sensor and temperature sensor.
A kind of engine start control method for mixed power automobile of the invention has the advantages that
(1) a kind of engine start control method for mixed power automobile of the invention, which is increased, enters target-like to clutch
The time judgement of state and the time of engine start judge, it is ensured that engine start does not postpone, and avoids asking for starting failure
Topic.
(2) a kind of engine start control method for mixed power automobile of the invention considers engine water temperature, engine
The influence of friction loss, engine pumping loss to clutch starting target torque, so that can obtain most in varied situations
Suitable clutch starts target torque, so that engine start is more smooth.
(3) a kind of engine start control method for mixed power automobile of the invention is increased to clutch starting torque
Slop control uses the different increased slopes of control clutch starting torque based on different engine current rotating speeds, so that
Engine start is more smooth.
(4) a kind of engine start control method for mixed power automobile of the invention increases in engine starting process
The output of motor compensating torque reduces the power loss in engine starting process, ensure that the ride comfort of engine start.
(5) a kind of engine start control method for mixed power automobile of the invention is increased before an engine is started to hair
The limitation of motivation output torque has reserved sufficient motor reserve torque, it is ensured that motor is capable of providing foot when engine start
Enough motor compensating torques, ensure that the ride comfort of engine start.
Above description sufficiently discloses a specific embodiment of the invention.It should be pointed out that being familiar with the field
Range of any change that technical staff does a specific embodiment of the invention all without departing from claims of the present invention.
Correspondingly, the scope of the claims of the invention is also not limited only to previous embodiment.
Claims (10)
1. a kind of engine start control method for mixed power automobile, which comprises the following steps:
S1, the starting gear for determining engine obtain the rotating speed of target of engine according to the starting gear;
S2, control clutch are in sliding state of rubbing, and judge whether clutch enters dbjective state;
S3, after the clutch enters dbjective state, obtain the current rotating speed of engine, judge the current rotating speed whether not
Less than the rotating speed of target;
If S4, the current rotating speed are not less than the rotating speed of target, control oil spout igniting and run the engine;
If S5, the current rotating speed are less than the rotating speed of target, the mesh of the clutch is obtained according to the current rotating speed
Torque and slope are marked, the clutch engagement is controlled and is turned round according to the starting that the target torque and slope limit the clutch
Square returns to step S3.
2. a kind of engine start control method for mixed power automobile according to claim 1, which is characterized in that described to obtain
The target torque for taking the clutch includes:
The timing since when the clutch enters dbjective state obtains before timing time reaches the first setting time T1
Target torque of the first object torque as clutch, the first object torque is according to Clutch input shaft revolving speed, engine
Current rotating speed, engine water temperature, engine friction torque loss and engine pump gas costing bio disturbance obtain;Work as timing time
After reaching the first setting time T1, target torque of second target torque as clutch, second target torque are obtained
It is inquired and is obtained from the first tables of data according to the current rotating speed of engine, first tables of data is for recording the current of engine
The mapping relations of revolving speed and the second target torque.
3. a kind of engine start control method for mixed power automobile according to claim 1, which is characterized in that described to obtain
Taking slope includes: the inquiry acquisition slope corresponding with the current rotating speed from the second tables of data, and the slope includes when described
Current rotating speed is less than first slope when setting speed, and second when the current rotating speed is more than or equal to setting speed is tiltedly
Rate, second slope are greater than the first slope;
It is described that obtain the rotating speed of target of engine according to the starting gear include: according to the starting gear from third tables of data
Middle inquiry obtains rotating speed of target corresponding with the starting gear, and the third tables of data is for recording the starting gear and hair
The mapping relations of the rotating speed of target of motivation.
4. a kind of engine start control method for mixed power automobile according to claim 1, which is characterized in that described to sentence
Dialysis clutch whether into dbjective state include:
Control clutch, which is in slide, starts timing when rubbing state, records the timing time;
Obtain the actual torque for starting the clutch;
Judge whether the timing time and the actual torque meet setting condition;
It imposes a condition if the timing time and the actual torque meet, determines that the clutch enters dbjective state;
If the timing time and the actual torque are unsatisfactory for imposing a condition, determine that the clutch does not enter target-like
State.
5. a kind of engine start control method for mixed power automobile according to claim 4, which is characterized in that described to sentence
Break the timing time and whether the actual torque meets setting condition and include:
When the actual torque reaches the second setting time not less than the torque of the half-clutch point of setting or the timing time
When T2, determines that the timing time and the actual torque meet and impose a condition;
When the actual torque be less than setting half-clutch point torque and the timing time be not up to the second setting time T2
When, determine that the timing time and the actual torque are unsatisfactory for imposing a condition.
6. a kind of engine start control method for mixed power automobile according to claim 1, which is characterized in that the side
Method further comprises the steps of:
Obtain the current output torque of motor of hybrid power automobile;
Motor torque penalty coefficient is obtained according to the starting gear;
Motor compensating torque is calculated according to the target torque and the Motor torque penalty coefficient;
It is exported according to the torque of the current output torque of the motor and the motor compensating torque control motors.
7. a kind of engine start control method for mixed power automobile according to claim 6, which is characterized in that described
Obtaining Motor torque penalty coefficient according to the starting gear includes: to inquire acquisition from the 4th tables of data according to the starting gear
Motor torque penalty coefficient corresponding with the starting gear, the 4th tables of data for record the starting gear with it is described
The mapping relations of Motor torque penalty coefficient;
It is described that calculate motor compensating torque according to the target torque and the Motor torque penalty coefficient include: that obtain mixing dynamic
Speed changer base ratio, transmission gear speed ratio and the driving motor of power automobile are to road wheel end speed ratio;Motor compensating torque is calculated,
Calculation formula is as follows:
Motor compensating torque=(target torque × Motor torque penalty coefficient) × (speed changer base ratio × transmission gear speed
Than) ÷ driving motor is to road wheel end speed ratio.
8. a kind of engine start control method for mixed power automobile according to claim 6 or 7, which is characterized in that institute
State method further include:
Before engine start, the current vehicle speed of hybrid vehicle is obtained;
It is inquired from the 5th tables of data according to the current vehicle speed and obtains motor output torque corresponding with the current vehicle speed
Threshold value, the threshold value are less than the total torque of the motor, and the 5th tables of data is for recording the current vehicle speed and the threshold
The mapping relations of value;
The output torque for controlling the motor is no more than the threshold value.
9. a kind of hybrid electric vehicle engine starts control system, for realizing described in any one of claim 1-8
Engine start control method for mixed power automobile, which is characterized in that the system comprises detection module, gearbox control,
Engine controller, electric machine controller and entire car controller;
The detection module is electrically connected with the entire car controller, and the parameter information that the detection module is used to detect automobile is concurrent
It send to the entire car controller;
Parameter information carries out logical operation and judgement to the entire car controller based on the received, and to the gearbox control,
Engine controller and electric machine controller issue control instruction;
The control instruction control clutch engagement that the gearbox control is sent according to the entire car controller;
The control instruction that the engine controller is sent according to the entire car controller controls engine oil spout igniting;
The torque for the control instruction control motor that the electric machine controller is sent according to the entire car controller exports.
10. a kind of hybrid electric vehicle engine according to claim 9 starts control system, which is characterized in that described
Detection module includes torque sensor, engine speed sensor, Clutch input shaft speed probe and temperature sensor.
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