CN103836180B - Gear-shifting control method and device - Google Patents

Abstract

The embodiment of the invention discloses a kind of gear-shifting control method, comprising: obtain the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft; According to current torque and the current Maximum Torque that can reach of transmission input shaft of transmission input shaft, draw virtual throttle value; According to virtual throttle value, the current speed of a motor vehicle, control the switching of automobile gear level.The embodiment of the invention also discloses a kind of shift controller.Adopt the present invention to reduce error, realize accurate gear shift.

Description

Gear-shifting control method and device

Technical field

The present invention relates to automotive field, particularly relate to a kind of gear-shifting control method and device.

Background technique

The current fuel engine automobile storage generally used is in all disadvantages, and statistics shows under the road conditions accounting for more than 80%, and a general-utility car only make use of 40% of power potential, also can fall to 25% in urban district, more seriously discharging waste gas befouling environment.Since the nineties in 20th century, grow to even greater heights to the cry improving environmental protection in countries in the world, and various electric vehicle is shown one's talent.Although people generally believe that future is the world of electric vehicle, current battery technology problem hinders the application of electric vehicle.Due to energy density and the gasoline phase ratio hundreds of times of battery, reach far away the numerical value required by people, expert estimates that electric vehicle also cannot replace fuel engine automobile (unless fuel cell technology has important breakthrough) within 10 years.The reality way made the best of both worlds that forced engineers to be found out, namely develops hybrid electric vehicle.Hybrid electric vehicle refers to and car is equipped with two or more power source: the generator set of storage battery, fuel cell, solar cell, internal combustion locomotive, and present hybrid automobile generally refers to internal combustion locomotive generator, adds the automobile of storage battery.

At present, emerging a four-drive hybrid electric car (if model is the mixed motor-car of E4WD) axis drive motor (ElectricRearAxleDriveMotor after rear axle adds, hereinafter referred to as ERAD motor), this motor is connected with rear axle by reduction gear; Driving is combined by engine-driving or by motor and motor at front axle.Wherein, drive the hybrid electric vehicle of front axle also known as the mixed motor-car of ISG (IntegratedStarterandGenerator, starting-generating integrated machine) by starting to combine with motor.Consider the factors such as structure, cost and fuel economy, four-drive hybrid electric car can carry gearbox at front axle usually.

In prior art, for this hybrid electric vehicle, normally determine the gear of Current vehicle based on current vehicle speed and current oil gate value.But current oil gate value, due to the impact of the power-assisted/braking by rear shaft motor, can not reflect front axle transmission input shaft actual torque size, therefore directly adopt current throttle

Value can cause the erroneous judgement of gear as the foundation that gear is selected.

Summary of the invention

Embodiment of the present invention technical problem to be solved is, provides a kind of gear-shifting control method and device, can reduce error, realizes accurate gear shift.

In order to solve the problems of the technologies described above, embodiments provide a kind of gear-shifting control method, comprising:

Obtain the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft;

According to current torque and the current Maximum Torque that can reach of transmission input shaft of transmission input shaft, draw virtual throttle value;

According to virtual throttle value, the current speed of a motor vehicle, control the switching of automobile gear level.

Wherein, the current torque of described transmission input shaft is specially the current output torque of motor, and the current Maximum Torque that can reach of described transmission input shaft is specially the current Maximum Torque that can reach of motor;

The described current torque according to transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, show that the step of virtual throttle value is specially:

According to current output torque and the current Maximum Torque that can reach of motor of motor, draw virtual throttle value.

Wherein, described virtual throttle value is the current output torque of motor and the ratio of the current Maximum Torque that can reach of motor.

Wherein, the current torque of described transmission input shaft comprises: the current output torque of motor, the current output torque of starting-generating integrated machine ISG, and the current Maximum Torque that can reach of described transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of starting-generating integrated machine ISG;

The described current torque according to transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, show that the step of virtual throttle value is specially:

According to current max. output torque, the current max. output torque that can reach of starting-generating integrated machine ISG that can reach of the current output torque of motor, the current output torque of starting-generating integrated machine ISG and motor, draw virtual throttle value.

Wherein, described virtual throttle value be first and value and second with the ratio of value, described first and value be the current output torque of motor and the current output torque of starting-generating integrated machine ISG and, described second and value be the current max. output torque that can reach of motor and the current max. output torque that can reach of starting-generating integrated machine ISG with.

Wherein, when obtaining the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, be specially:

Obtain the current remaining capacity SOC of the current Maximum Torque that can reach of the current speed of a motor vehicle, the current torque of transmission input shaft and transmission input shaft and high-tension battery;

The described current torque according to transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, draw the step of virtual throttle value, be specially:

According to the current remaining capacity SOC of the current Maximum Torque that can reach of the current torque of transmission input shaft, transmission input shaft and high-tension battery, draw virtual throttle value.

Wherein, the current torque of described transmission input shaft comprises: the current output torque of motor, the current output torque of starting-generating integrated machine ISG, and the current Maximum Torque that can reach of described transmission input shaft comprises: the max. output torque that motor is current can be reached, the maximum modified moment of torsion of starting-generating integrated machine ISG;

The Maximum Torque that the described current torque according to transmission input shaft, transmission input shaft be current can be reached and the current remaining capacity SOC of high-tension battery, draw the step of virtual throttle value, comprising:

According to the current remaining capacity SOC of high-tension battery, draw the modifying factor to virtual throttle value;

According to current max. output torque, the described modifying factor that can reach of starting-generating integrated machine ISG, draw the maximum modified moment of torsion of starting-generating integrated machine ISG;

According to the current output torque of motor, the current output torque of starting-generating integrated machine starting-generating integrated machine ISG and motor current can reach max. output torque, starting-generating integrated machine ISG maximum modified moment of torsion obtain virtual throttle value.

Wherein, described virtual throttle value be first and value and the 3rd with the ratio of value, described first and value be the current output torque of motor and the current output torque of starting-generating integrated machine ISG with, described 3rd and value be the current max. output torque that can reach being specially starting-generating integrated machine ISG with the maximum modified moment of torsion of, described starting-generating integrated machine ISG of the maximum modified moment of torsion of starting-generating integrated machine ISG and the current max. output torque that can reach of motor and the product of modifying factor.

Wherein, show that the step of modifying factor is as follows according to the current remaining capacity SOC of high-tension battery:

When the current remaining capacity SOC of described high-tension battery is more than or equal to first threshold, described modifying factor is 1;

When the current remaining capacity SOC of described high-tension battery is less than or equal to Second Threshold, described modifying factor is 0;

When the current remaining capacity SOC of described high-tension battery is less than first threshold and is greater than Second Threshold, described modifying factor is: the ratio of the first difference and the second difference cube, described first difference is the current remaining capacity SOC of high-tension battery and the difference of Second Threshold, and described second difference is the difference of first threshold and Second Threshold.

Wherein, according to virtual throttle value, the current speed of a motor vehicle, control the step of the switching of automobile gear level, be specially: according to virtual throttle value, the current speed of a motor vehicle and prefabricated two-dimentional gearshift map, control the switching of automobile gear level.

Wherein, described according to virtual throttle value, the current speed of a motor vehicle and prefabricated two-dimentional gearshift map, the step controlling the switching of automobile gear level comprises:

The gear shift line that inquiry is corresponding with described virtual throttle value and current vehicle speed in prefabricated two-dimentional gearshift map;

If inquire the gear shift line corresponding with described virtual throttle value and current vehicle speed, then control automobile gear level be switched to described in the gear corresponding to gear shift line that inquires;

If when not inquiring the gear shift line corresponding with described virtual throttle value and current vehicle speed, then keep current gear constant.

Correspondingly, the embodiment of the present invention additionally provides a kind of shift controller, comprising:

Acquisition module, for obtaining the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft;

Virtual throttle is worth module, for according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, draws virtual throttle value;

Handover module, for according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.

Correspondingly, the embodiment of the present invention additionally provides another kind of shift controller, comprising:

Acquisition module, for obtaining the current remaining capacity SOC of the current Maximum Torque that can reach of the current speed of a motor vehicle, the current torque of transmission input shaft, transmission input shaft and high-tension battery;

Virtual throttle is worth module, for the current remaining capacity SOC of the current Maximum Torque that can reach of the current torque according to transmission input shaft, transmission input shaft and high-tension battery, draws virtual throttle value;

Handover module, for according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.

Implement the embodiment of the present invention, there is following beneficial effect:

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.

Fig. 1 is the schematic flow sheet of the first embodiment of gear-shifting control method of the present invention.

Fig. 2 is the schematic flow sheet of the second embodiment of gear-shifting control method of the present invention.

Fig. 3 is the schematic flow sheet of the 3rd embodiment of gear-shifting control method of the present invention.

Fig. 4 is the schematic flow sheet of the 4th embodiment of gear-shifting control method of the present invention.

Fig. 5 is the schematic flow sheet of the 5th embodiment of gear-shifting control method of the present invention.

Fig. 6 is the two-dimentional gearshift map of the embodiment of the present invention.

Fig. 7 is the structural representation of the first embodiment of shift controller of the present invention.

Fig. 8 is the structural representation of the second embodiment of shift controller of the present invention.

Fig. 9 is the structural representation of the 3rd embodiment of shift controller of the present invention.

Figure 10 is the structural representation of the 4th embodiment of shift controller of the present invention.

Figure 11 is the structural representation of the 5th embodiment of shift controller of the present invention.

Figure 12 is the structural representation of vehicle drive shaft.

Embodiment

Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technological scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Please refer to Fig. 1, is the schematic flow sheet of the first embodiment of gear-shifting control method of the present invention.The method comprises:

Step S101, obtains the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft.

In concrete enforcement, transmission input shaft is connected with the front axle of vehicle.Figure 12 is the structural representation of vehicle drive shaft.Wherein, 1 represents drive axle, and 2 represent rear drive shaft.As can be seen from the figure, motor and starting-generating integrated machine ISG (hereinafter referred to as ISG) motor are rigidly connected, by gearbox Direct driver drive axle; ERAD motor is connected with rear axle by reduction gear.

If when the drive axle of vehicle is only by engine-driving, current torque is specially the current output torque of motor; The current Maximum Torque that can reach of transmission input shaft is specially the current Maximum Torque that can reach of motor.

If when the drive axle of vehicle combines driving by motor and ISG as shown in figure 12, the current torque of transmission input shaft comprises: the current output torque of motor, the current output torque of ISG; The current Maximum Torque that can reach of transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of ISG.

And be usually furnished with torque distribution system in vehicle, such as in four-drive hybrid electric car, this system obtains the driving torque of operator demand by the speed of a motor vehicle and current oil gate value, then best according to fuel economy, by torque distribution to motor, ISG motor and ERAD motor.Therefore, step S101 can obtain the current torque of transmission input shaft by torque distribution system.In addition, 4 wheel driven mixes motor-car and is also provided with engine controller and ISG controller.Engine controller can determine according to the water temperature of brake petal, motor the Maximum Torque that current power function provides, and ISG controller can determine by the temperature of high-tension battery and brake petal the Maximum Torque that current I SG motor can provide.Therefore, step S101 can obtain the current Maximum Torque that can reach of transmission input shaft by engine controller and ISG controller.

Preferably, gearbox can adopt automatic transmission case, and automatic transmission case, due to the consistent favor that structure is simple, cost is lower, fuel economy receives well everybody, is therefore suitable for being applied on four-drive hybrid electric car very much.

Step S102, according to current torque and the current Maximum Torque that can reach of transmission input shaft of transmission input shaft, draws virtual throttle value.

Step S103, according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.In general, when virtual throttle value is less than normal, the load of motor and battery is less, the gear (namely high-grade) that velocity ratio usually can be selected less than normal, and can switch to top grade when the speed of a motor vehicle is lower, to reduce oil consumption, ensures Economy; When virtual throttle value is bigger than normal, the load of motor and battery is comparatively large, the gear (i.e. low grade) that velocity ratio usually can be selected bigger than normal, only switches to top grade, to ensure the power character that vehicle is higher at the speed of a motor vehicle Shi Caineng that reach a certain height.

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Please refer to Fig. 2, is the schematic flow sheet of the second embodiment of gear-shifting control method of the present invention.The embodiment introduces when automobile front-axle is only by gear-shifting control method during engine-driving, concrete steps are as follows:

Step S201, obtains the current speed of a motor vehicle, the current output torque of motor and the current Maximum Torque that can reach of motor.

Step S202, according to the current output torque of motor and and the current Maximum Torque that can reach of motor, draw virtual throttle value.Preferably, virtual throttle value Perc _vrtfor the current output torque T of motor _engthe Maximum Torque T that can reach current with motor _engmaxratio.Concrete formula is as follows:

${\mathrm{Perc}}_{vrt}=\frac{T_{eng}}{T_{eng\max }}$

Step S203, according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.In general, when virtual throttle value is less than normal, the load of motor and battery is less, can switch to top grade when the speed of a motor vehicle is lower, to reduce oil consumption, ensures Economy; When virtual throttle value is bigger than normal, the load of motor and battery is comparatively large, needs to switch to top grade, to ensure the power character that vehicle is higher at the speed of a motor vehicle Shi Caineng that reach a certain height.

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Please refer to Fig. 3, is the schematic flow sheet of the 3rd embodiment of gear-shifting control method of the present invention.The embodiment introduces gear-shifting control method when current axis combines driving by motor and ISG, concrete steps are as follows:

Step S301, obtains the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft.The current torque of transmission input shaft comprises: the current output torque of motor, the current output torque of ISG; The current Maximum Torque that can reach of transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of ISG.

Step S302, according to current max. output torque, the current max. output torque that can reach of ISG that can reach of the current output torque of motor, the current output torque of ISG and motor, draws virtual throttle value.

Preferably, virtual throttle value Perc _vrtbe first and value and second with the ratio of value.Wherein, first is the current output torque T of motor with value _engwith the current output torque T of ISG _iSGand, second and value be the current max. output torque T that can reach of motor _engmaxthe max. output torque T that can reach current with ISG _iSGmaxand.Concrete formula is as follows:

${\mathrm{Perc}}_{vrt}=\frac{T_{eng}+T_{ISG}}{T_{eng\max }+T_{ISG\max }}$

Step S303, according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.In general, when virtual throttle value is less than normal, the load of motor and battery is less, the gear (namely high-grade) that velocity ratio usually can be selected less than normal, and can switch to top grade when the speed of a motor vehicle is lower, to reduce oil consumption, ensures Economy; When virtual throttle value is bigger than normal; the load of motor and battery is comparatively large, the gear (i.e. low grade) that velocity ratio usually can be selected bigger than normal, only switches to top grade at the speed of a motor vehicle Shi Caineng that reach a certain height; to ensure the power character that vehicle is higher, and larger moment of torsion allowance is provided to generate electricity for ISG.

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Please refer to Fig. 4, is the schematic flow sheet of the 4th embodiment of gear-shifting control method of the present invention.In order to determine the current gear of vehicle more exactly, provide the power adapted to vehicle.This embodiment revises to gear switch based on the current remaining capacity SOC (hereinafter referred to as current SOC) of high-tension battery, and concrete steps are as follows:

Step S401, obtain the current speed of a motor vehicle, the current torque of transmission input shaft, transmission input shaft current can reach Maximum Torque, high-tension battery current SOC (StateofCapacity, residual capacity).The current torque of transmission input shaft comprises: the current output torque of motor, the current output torque of ISG; The current Maximum Torque that can reach of transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of ISG.

Step S402, according to the current Maximum Torque that can reach of the current torque of transmission input shaft, transmission input shaft and current SOC, draws virtual throttle value.

In the process of implementation step S402, first according to current SOC, draw the modifying factor to virtual throttle value; Then according to the current max. output torque that can reach of ISG and modifying factor, the maximum modified moment of torsion of ISG is drawn; Finally according to the current output torque of motor, the current output torque of starting-generating integrated machine ISG and motor current can reach max. output torque, ISG maximum modified moment of torsion obtain virtual throttle value.

Preferably, virtual throttle value Perc _vrtbe first and value and the 3rd with the ratio of value.Wherein, first is the current output torque T of motor with value _engwith the current output torque T of ISG _iSGand, the 3rd and value be the maximum modified moment of torsion of ISG and the current max. output torque T that can reach of motor _engmaxand.Wherein, the maximum modified moment of torsion of ISG is specially the current max. output torque T that can reach of ISG _iSGmaxwith the product of modifying factor η.Concrete formula is as follows:

${\mathrm{Perc}}_{vrt}=\frac{T_{eng}+T_{ISG}}{T_{eng\max }+{\mathrm{\ηT}}_{ISG\max }}$

Show that the step of modifying factor η is as follows according to current SOC: if current SOC is more than or equal to first threshold SOC _h, modifying factor η is 1; If current SOC is less than or equal to Second Threshold SOC _l, modifying factor η is 0; If current SOC is less than first threshold SOC _hand be greater than Second Threshold SOC _ltime, modifying factor η is: the ratio of the first difference and the second difference cube, the first difference is current SOC and Second Threshold SOC _ldifference, the second difference is first threshold SOC _hwith Second Threshold SOC _ldifference.Concrete formula is as follows:

$\mathrm{\&eta;}=\left\{\begin{array}{cc}1& SOC\&GreaterEqual;{\mathrm{SOC}}_H\\ {\left(\frac{SOC-{\mathrm{SOC}}_L}{{\mathrm{SOC}}_H-{\mathrm{SOC}}_L}\right)}^3& {\mathrm{SOC}}_L<SOC<{\mathrm{SOC}}_H\\ 0& SOC\&le;{\mathrm{SOC}}_L\end{array}\right.$

Wherein, SOC _hbe a higher SOC threshold value, show not need to select to revise to gear according to SOC higher than this threshold value; SOC _lbeing a lower SOC threshold value, showing that needs are from considering the correction of SOC to gear to the full extent lower than this threshold value.SOC _hand SOC _lbe the upper limit value and lower limit value in order to the high-tension battery electricity protecting the life-span of high-tension battery to provide, the size of occurrence needs to determine according to the performance of battery itself.

Such as, SOC _hcan value 70%, SOC _lcan value 30%.

Step S403, according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.In general, when virtual throttle value is less than normal, the load of motor and battery is less, the gear (namely high-grade) that velocity ratio usually can be selected less than normal, and can switch to top grade when the speed of a motor vehicle is lower, to reduce oil consumption, ensures Economy; When virtual throttle value is bigger than normal; the load of motor and battery is comparatively large, the gear (i.e. low grade) that velocity ratio usually can be selected bigger than normal, only switches to top grade at the speed of a motor vehicle Shi Caineng that reach a certain height; to ensure the power character that vehicle is higher, and larger moment of torsion allowance is provided to generate electricity for ISG.

By modifying factor, correction is carried out to gear switch and have two objects: one is when SOC is lower, virtual throttle value can be bigger than normal, this gear that step S403 will be made to select velocity ratio bigger than normal, to increase power, thus makes up the adynamia because ERED motor power-assisted deficiency causes; Two is when SOC is lower, step S403 increases power by selecting velocity ratio gear bigger than normal, can on the basis meeting driver torque request, and motor is carried enough provides more moment of torsion allowance for ISG generating, thus increase the SOC value of high-tension battery, ensure the balance of SOC.

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Please refer to Fig. 5, is the schematic flow sheet of the 5th embodiment of gear-shifting control method of the present invention.The method comprises:

Step S501, obtains the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft.When automobile front-axle is only by engine-driving, the current torque of transmission input shaft is specially the current output torque of motor; The current Maximum Torque that can reach of transmission input shaft is specially the current Maximum Torque that can reach of motor.When current axis combines driving by motor and ISG, the current torque of transmission input shaft comprises: the current output torque of motor, the current output torque of ISG; The current Maximum Torque that can reach of transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of ISG.

Step S502, according to current torque and the current Maximum Torque that can reach of transmission input shaft of transmission input shaft, draws virtual throttle value.

Step S503, according to virtual throttle value, the current speed of a motor vehicle and prefabricated two-dimentional gearshift map, controls the switching of automobile gear level.Particularly, the gear shift line corresponding with described virtual throttle value and current vehicle speed can be inquired about in prefabricated two-dimentional gearshift map; If inquire the gear shift line corresponding with virtual throttle value and current vehicle speed, then control automobile gear level be switched to described in the gear corresponding to gear shift line that inquires; If when not inquiring the gear shift line corresponding with virtual throttle value and current vehicle speed, then keep current gear constant.

Fig. 6 is the two-dimentional gearshift map of the embodiment of the present invention.In figure, X-axis is virtual throttle value, and Y-axis is current vehicle speed.Wherein, solid line 1 represents that 1 grade rises 2 grades, and solid line 2 represents that 2 grades rise 3 grades, and solid line 3 represents that 3 grades rise 4 grades, and solid line 4 represents that 4 grades rise 5 grades, and dotted line 5 represents that 2 grades are fallen 1 grade, and dotted line 6 represents that 3 grades are fallen 2 grades, and dotted line 7 represents that 4 grades are fallen 3 grades, and dotted line 8 represents that 5 grades are fallen 4 grades.

With 4 grades rise 5 grades upshift line citing: when the speed of a motor vehicle is for 100km/h, when virtual throttle value is 65%, gearbox is in 4 grades, if due to SOC value increase or transmission input shaft current torque reduce cause virtual throttle to drop to 50%, be then raised to 5 grades by 4 grades.

With 5 grades fall 4 grades downshift line citing: when the speed of a motor vehicle is for 100km/h, when virtual throttle value is 50%, gearbox is in 5 grades, if due to SOC value reduce or transmission input shaft current torque increase cause virtual throttle to rise to 65%, then drop to 4 grades by 5 grades.

When the speed of a motor vehicle is 100km/h, if virtual throttle value is 80%, now the coordinate of the speed of a motor vehicle and the point corresponding to virtual throttle value does not drop on any gear shift line, and current gear need be kept constant.Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Fig. 1 to Fig. 6 has carried out detailed elaboration to embodiment of the present invention gear-shifting control method, will continue by reference to the accompanying drawings below, is described the device corresponding to said method flow process.

Please refer to Fig. 7, is the structural representation of the first embodiment of shift controller of the present invention.Shift controller 100 comprises:

First acquisition module 110, for obtaining the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft.

In concrete enforcement, transmission input shaft is connected with the front axle of vehicle, if when the front axle of vehicle is only by engine-driving, current torque is specially the current output torque of motor; The current Maximum Torque that can reach of transmission input shaft is specially the current Maximum Torque that can reach of motor.If when the front axle of vehicle combines driving by motor and ISG, the current torque of transmission input shaft comprises: the current output torque of motor, the current output torque of ISG; The current Maximum Torque that can reach of transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of ISG.

And be usually furnished with torque distribution system in vehicle, such as in four-drive hybrid electric car, this system obtains the driving torque of operator demand by the speed of a motor vehicle and current oil gate value, then best according to fuel economy, by torque distribution to motor, ISG motor and ERAD motor.Therefore, step S101 can obtain the current torque of transmission input shaft by torque distribution system.In addition, 4 wheel driven mixes motor-car and is also provided with engine controller and ISG controller.Engine controller can determine according to the water temperature of brake petal, motor the Maximum Torque that current power function provides, and ISG controller can determine by the temperature of high-tension battery and brake petal the Maximum Torque that current I SG motor can provide.Therefore, the first acquisition module 110 can obtain the current torque of transmission input shaft by torque distribution system.

4 wheel driven mixes motor-car and is also provided with engine controller and ISG controller.Engine controller can determine according to the water temperature of brake petal, motor the Maximum Torque that current power function provides, and ISG controller can determine by the temperature of high-tension battery and brake petal the Maximum Torque that current I SG motor can provide.Therefore, the first acquisition module 1101 can obtain the current Maximum Torque that can reach of transmission input shaft by engine controller and ISG controller.

First virtual throttle is worth module 120, for according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, draws virtual throttle value.First handover module 130, for according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.In general, when virtual throttle value is less than normal, the load of motor and battery is less, the gear (namely high-grade) that handover module 130 can select velocity ratio less than normal usually, and can top grade be switched to when the speed of a motor vehicle is lower, to reduce oil consumption, ensure Economy; When virtual throttle value is bigger than normal; the load of motor and battery is larger; the gear (namely low-grade) that handover module 130 can select velocity ratio bigger than normal usually, only switches to top grade, to ensure the power character that vehicle is higher at the speed of a motor vehicle Shi Caineng that reach a certain height.

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Please refer to Fig. 8, is the structural representation of the second embodiment of shift controller of the present invention.The embodiment introduces when automobile front-axle is only by the shift controller 200 during engine-driving, comprising:

Second acquisition module 210, for obtaining the current speed of a motor vehicle, the current output torque of motor and the current Maximum Torque that can reach of motor.

Second virtual throttle is worth module 220, for according to the current output torque of motor and and the current Maximum Torque that can reach of motor, draw virtual throttle value.Preferably, virtual throttle value Perc _vrtfor the current output torque T of motor _engthe Maximum Torque T that can reach current with motor _engmaxratio.Concrete formula is as follows:

${\mathrm{Perc}}_{vrt}=\frac{T_{eng}}{T_{eng\max }}$

Second handover module 230, for according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.In general, when virtual throttle value is less than normal, the load of motor and battery is less, can switch to top grade when the speed of a motor vehicle is lower, to reduce oil consumption, ensures Economy; When virtual throttle value is bigger than normal, the load of motor and battery is comparatively large, needs to switch to top grade, to ensure the power character that vehicle is higher at the speed of a motor vehicle Shi Caineng that reach a certain height.

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Please refer to Fig. 9, is the structural representation of the 3rd embodiment of shift controller of the present invention.The embodiment introduces the shift controller 300 when current axis combines driving by motor and ISG, concrete steps are as follows:

3rd acquisition module 310, for obtaining the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft.The current torque of transmission input shaft comprises: the current output torque of motor, the current output torque of ISG; The current Maximum Torque that can reach of transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of ISG.

Virtual throttle is worth module 320, for according to current max. output torque, the current max. output torque that can reach of ISG that can reach of the current output torque of motor, the current output torque of ISG and motor, draws virtual throttle value.

Preferably, virtual throttle value Perc _vrtbe first and value and second with the ratio of value.Wherein, first is the current output torque T of motor with value _engwith the current output torque T of ISG _iSGand, second and value be the current max. output torque T that can reach of motor _engmaxthe max. output torque T that can reach current with ISG _iSGmaxand.Concrete formula is as follows:

${\mathrm{Perc}}_{vrt}=\frac{T_{eng}+T_{ISG}}{T_{eng\max }+T_{ISG\max }}$

3rd handover module 330, for according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.In general, when virtual throttle value is less than normal, the load of motor and battery is less, the gear (namely high-grade) that velocity ratio usually can be selected less than normal, and can switch to top grade when the speed of a motor vehicle is lower, to reduce oil consumption, ensures Economy; When virtual throttle value is bigger than normal; the load of motor and battery is comparatively large, the gear (i.e. low grade) that velocity ratio usually can be selected bigger than normal, only switches to top grade at the speed of a motor vehicle Shi Caineng that reach a certain height; to ensure the power character that vehicle is higher, and larger moment of torsion allowance is provided to generate electricity for ISG.

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Please refer to Figure 10, is the structural representation of the 4th embodiment of shift controller of the present invention.In order to determine the current gear of vehicle more exactly, provide the power adapted to vehicle, this embodiment revises to gear switch based on SOC, and shift controller 400 comprises:

4th acquisition module 410, obtain the current speed of a motor vehicle, the current torque of transmission input shaft, transmission input shaft current can reach Maximum Torque, high-tension battery current SOC.The current torque of transmission input shaft comprises: the current output torque of motor, the current output torque of ISG; The current Maximum Torque that can reach of transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of ISG.

4th virtual throttle is worth module 420, for the current SOC of the current Maximum Torque that can reach of the current torque according to transmission input shaft, transmission input shaft and high-tension battery, draws virtual throttle value.Particularly, the 4th virtual throttle is worth module 420 first according to current SOC value, draws the modifying factor to virtual throttle value; Then according to the current max. output torque that can reach of ISG and modifying factor, the maximum modified moment of torsion of ISG is drawn; Finally according to the current output torque of motor, the current output torque of starting-generating integrated machine ISG and motor current can reach max. output torque, ISG maximum modified moment of torsion obtain virtual throttle value.

Preferably, virtual throttle value Perc _vrtbe first and value and the 3rd with the ratio of value.Wherein, first is the current output torque T of motor with value _engwith the current output torque T of ISG _iSGand, the 3rd and value be the maximum modified moment of torsion of ISG and the current max. output torque T that can reach of motor _engmaxand.Wherein, the maximum modified moment of torsion of ISG is specially the current max. output torque T that can reach of ISG _iSGmaxwith the product of modifying factor η.Concrete formula is as follows:

${\mathrm{Perc}}_{vrt}=\frac{T_{eng}+T_{ISG}}{T_{eng\max }+{\mathrm{\&eta;T}}_{ISG\max }}$

Modifying factor η is drawn according to current SOC, specific as follows: if current SOC is more than or equal to first threshold SOC _h, modifying factor η is 1; If current SOC is less than or equal to Second Threshold SOC _l, modifying factor η is 0; If current SOC is less than first threshold SOC _hand be greater than Second Threshold SOC _ltime, modifying factor η is: the ratio of the first difference and the second difference cube, the first difference is current SOC and Second Threshold SOC _ldifference, the second difference is first threshold SOC _hwith Second Threshold SOC _ldifference.Concrete formula is as follows:

$\mathrm{\&eta;}=\left\{\begin{array}{cc}1& SOC\&GreaterEqual;{\mathrm{SOC}}_H\\ {\left(\frac{SOC-{\mathrm{SOC}}_L}{{\mathrm{SOC}}_H-{\mathrm{SOC}}_L}\right)}^3& {\mathrm{SOC}}_L<SOC<{\mathrm{SOC}}_H\\ 0& SOC\&le;{\mathrm{SOC}}_L\end{array}\right.$

Wherein, SOC _hbe a higher SOC threshold value, show not need to select to revise to gear according to SOC higher than this threshold value; SOC _lbeing a lower SOC threshold value, showing that needs are from considering the correction of SOC to gear to the full extent lower than this threshold value.SOC _hand SOC _lbe the upper limit value and lower limit value in order to the high-tension battery electricity protecting the life-span of high-tension battery to provide, the size of occurrence needs to determine according to the performance of electricity itself.Such as, SOC _hcan value 70%, SOC _lcan value 30%.

4th handover module 430, for according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.In general, when virtual throttle value is less than normal, the load of motor and battery is less, the gear (namely high-grade) that velocity ratio usually can be selected less than normal, and can switch to top grade when the speed of a motor vehicle is lower, to reduce oil consumption, ensures Economy; When virtual throttle value is bigger than normal; the load of motor and battery is comparatively large, the gear (i.e. low grade) that velocity ratio usually can be selected bigger than normal, only switches to top grade at the speed of a motor vehicle Shi Caineng that reach a certain height; to ensure the power character that vehicle is higher, and larger moment of torsion allowance is provided to generate electricity for ISG.

By modifying factor, correction is carried out to gear switch and have two objects: one is when SOC is lower, virtual throttle value can be bigger than normal, this gear that step S403 will be made to select velocity ratio bigger than normal, to increase power, thus makes up the adynamia because ERED motor power-assisted deficiency causes; Two is when SOC is lower, step S403 increases power by selecting velocity ratio gear bigger than normal, can on the basis meeting driver torque request, and motor is carried enough provides more moment of torsion allowance for ISG generating, thus increase the SOC value of high-tension battery, ensure the balance of SOC.

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

Please refer to Figure 11, is the structural representation of the 5th embodiment of shift controller of the present invention.This shift controller 500 comprises:

5th acquisition module 510, for obtaining the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft.

5th virtual throttle is worth module 520, for according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, draws virtual throttle value.When automobile front-axle is only by engine-driving, the current torque of transmission input shaft is specially the current output torque of motor; The current Maximum Torque that can reach of transmission input shaft is specially the current Maximum Torque that can reach of motor.When current axis combines driving by motor and ISG, the current torque of transmission input shaft comprises: the current output torque of motor, the current output torque of ISG; The current Maximum Torque that can reach of transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of ISG.

5th handover module 530, for according to virtual throttle value, the current speed of a motor vehicle and prefabricated two-dimentional gearshift map, controls the switching of automobile gear level.Particularly, the gear shift line corresponding with described virtual throttle value and current vehicle speed can be inquired about in prefabricated two-dimentional gearshift map; If inquire the gear shift line corresponding with virtual throttle value and current vehicle speed, then control automobile gear level be switched to described in the gear corresponding to gear shift line that inquires; If when not inquiring the gear shift line corresponding with virtual throttle value and current vehicle speed, then keep current gear constant.

As shown in Figure 6, the upshift line citing of 5 grades is risen: when the speed of a motor vehicle is for 100km/h, when virtual throttle value is 65%, gearbox is in 4 grades with 4 grades, if because the current torque of SOC value increase or transmission input shaft reduces to cause virtual throttle to drop to 50%, be then raised to 5 grades by 4 grades.With 5 grades fall 4 grades downshift line citing: when the speed of a motor vehicle is for 100km/h, when virtual throttle value is 50%, gearbox is in 5 grades, if due to SOC value reduce or transmission input shaft current torque increase cause virtual throttle to rise to 65%, then drop to 4 grades by 5 grades.When the speed of a motor vehicle is 100km/h, if virtual throttle value is 80%, now the coordinate of the speed of a motor vehicle and the point corresponding to virtual throttle value does not drop on any gear shift line, and current gear need be kept constant.

Embodiments of the invention are by drawing virtual throttle value according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, and the switching of automobile gear level is controlled according to virtual throttle value and the current speed of a motor vehicle, thus eliminate the impact of rear shaft motor, make virtual throttle value can reflect transmission input shaft actual torque size, the accurate control to gear switch of realization.

One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random store-memory body (RandomAccessMemory, RAM) etc.

Above disclosedly be only a kind of preferred embodiment of the present invention, certainly the interest field of the present invention can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that the claims in the present invention are done, still belong to the scope that invention is contained.

Claims (13)

1. a gear-shifting control method, is characterized in that, comprising:

Obtain the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft;

According to current torque and the current Maximum Torque that can reach of transmission input shaft of transmission input shaft, draw virtual throttle value;

According to virtual throttle value, the current speed of a motor vehicle, control the switching of automobile gear level.

2. the method for claim 1, is characterized in that, the current torque of described transmission input shaft is specially the current output torque of motor, and the current Maximum Torque that can reach of described transmission input shaft is specially the current Maximum Torque that can reach of motor;

The described current torque according to transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, show that the step of virtual throttle value is specially:

According to current output torque and the current Maximum Torque that can reach of motor of motor, draw virtual throttle value.

3. method as claimed in claim 2, it is characterized in that, described virtual throttle value is the current output torque of motor and the ratio of the current Maximum Torque that can reach of motor.

4. the method for claim 1, it is characterized in that, the current torque of described transmission input shaft comprises: the current output torque of motor, the current output torque of starting-generating integrated machine ISG, and the current Maximum Torque that can reach of described transmission input shaft comprises: the max. output torque that motor current can reach, the current max. output torque that can reach of starting-generating integrated machine ISG;

The described current torque according to transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, show that the step of virtual throttle value is specially:

According to current max. output torque, the current max. output torque that can reach of starting-generating integrated machine ISG that can reach of the current output torque of motor, the current output torque of starting-generating integrated machine ISG and motor, draw virtual throttle value.

5. method as claimed in claim 4, it is characterized in that, described virtual throttle value be first and value and second with the ratio of value, described first and value be the current output torque of motor and the current output torque of starting-generating integrated machine ISG and, described second and value be the current max. output torque that can reach of motor and the current max. output torque that can reach of starting-generating integrated machine ISG with.

6. the method for claim 1, is characterized in that, obtains the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, is specially:

Obtain the current remaining capacity SOC of the current Maximum Torque that can reach of the current speed of a motor vehicle, the current torque of transmission input shaft and transmission input shaft and high-tension battery;

The described current torque according to transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, draw the step of virtual throttle value, be specially:

According to the current Maximum Torque that can reach of the current torque of transmission input shaft, transmission input shaft and current SOC, draw virtual throttle value.

7. method as claimed in claim 6, it is characterized in that, the current torque of described transmission input shaft comprises: the current output torque of motor, the current output torque of starting-generating integrated machine ISG, and the current Maximum Torque that can reach of described transmission input shaft comprises: the max. output torque that motor is current can be reached, the maximum modified moment of torsion of starting-generating integrated machine ISG;

The Maximum Torque that the described current torque according to transmission input shaft, transmission input shaft be current can be reached and the current remaining capacity SOC of high-tension battery, draw the step of virtual throttle value, comprising:

According to the current remaining capacity SOC of high-tension battery, draw the modifying factor to virtual throttle value;

According to current max. output torque, the described modifying factor that can reach of starting-generating integrated machine ISG, draw the maximum modified moment of torsion of starting-generating integrated machine ISG;

According to the current output torque of motor, the current output torque of starting-generating integrated machine ISG and motor current can reach max. output torque, starting-generating integrated machine ISG maximum modified moment of torsion obtain virtual throttle value.

8. method as claimed in claim 7, it is characterized in that, described virtual throttle value be first and value and the 3rd with the ratio of value, described first and value be the current output torque of motor and the current output torque of starting-generating integrated machine ISG with, described 3rd and value be the current max. output torque that can reach being specially starting-generating integrated machine ISG with the maximum modified moment of torsion of, described starting-generating integrated machine ISG of the maximum modified moment of torsion of starting-generating integrated machine ISG and the current max. output torque that can reach of motor and the product of modifying factor.

9. method as claimed in claim 8, is characterized in that, show that the step of modifying factor is as follows according to the current remaining capacity SOC of high-tension battery:

When the current remaining capacity SOC of described high-tension battery is more than or equal to first threshold,

Described modifying factor is 1;

When the current remaining capacity SOC of described high-tension battery is less than or equal to Second Threshold,

Described modifying factor is 0;

When the current remaining capacity SOC of described high-tension battery is less than first threshold and is greater than Second Threshold, described modifying factor is: the ratio of the first difference and the second difference cube, described first difference is the current remaining capacity SOC of high-tension battery and the difference of Second Threshold, and described second difference is the difference of first threshold and Second Threshold.

10. described method as claimed in claim 1, is characterized in that, according to virtual throttle value, the current speed of a motor vehicle, controls the step of the switching of automobile gear level, is specially:

According to virtual throttle value, the current speed of a motor vehicle and prefabricated two-dimentional gearshift map, control the switching of automobile gear level.

11. methods as claimed in claim 10, is characterized in that, described according to virtual throttle value, the current speed of a motor vehicle and prefabricated two-dimentional gearshift map, and the step controlling the switching of automobile gear level comprises:

The gear shift line that inquiry is corresponding with described virtual throttle value and current vehicle speed in prefabricated two-dimentional gearshift map;

If inquire the gear shift line corresponding with described virtual throttle value and current vehicle speed, then control automobile gear level be switched to described in the gear corresponding to gear shift line that inquires;

If when not inquiring the gear shift line corresponding with described virtual throttle value and current vehicle speed, then keep current gear constant.

12. 1 kinds of shift controllers, is characterized in that, comprising:

Acquisition module, for obtaining the current speed of a motor vehicle, the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft;

Virtual throttle is worth module, for according to the current torque of transmission input shaft and the current Maximum Torque that can reach of transmission input shaft, draws virtual throttle value;

Handover module, for according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.

13. 1 kinds of shift controllers, is characterized in that, comprising:

Acquisition module, for obtaining the current remaining capacity SOC of the current Maximum Torque that can reach of the current speed of a motor vehicle, the current torque of transmission input shaft, transmission input shaft and high-tension battery;

Virtual throttle is worth module, for the current remaining capacity SOC of the current Maximum Torque that can reach of the current torque according to transmission input shaft, transmission input shaft and high-tension battery, draws virtual throttle value;

Handover module, for according to virtual throttle value, the current speed of a motor vehicle, controls the switching of automobile gear level.