CN111361565A - Vehicle gear shifting method and system and vehicle - Google Patents
Vehicle gear shifting method and system and vehicle Download PDFInfo
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- CN111361565A CN111361565A CN201811590002.5A CN201811590002A CN111361565A CN 111361565 A CN111361565 A CN 111361565A CN 201811590002 A CN201811590002 A CN 201811590002A CN 111361565 A CN111361565 A CN 111361565A
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- 230000001133 acceleration Effects 0.000 abstract description 11
- 238000010586 diagram Methods 0.000 description 6
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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
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
- B60W30/18—Propelling the vehicle
- B60W30/19—Improvement of gear change, e.g. by synchronisation or smoothing gear shift
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Abstract
The invention provides a gear shifting method and system of a vehicle and the vehicle. The vehicle comprises an engine and a BSG motor, and the gear shifting method of the vehicle comprises the following steps: acquiring a basic gear shifting point corresponding to the current accelerator pedal opening and a BSG motor full-load charging gear shifting point, wherein a first vehicle speed corresponding to the BSG motor full-load charging gear shifting point is greater than a second vehicle speed corresponding to the basic gear shifting point; acquiring a charging load coefficient corresponding to the current charging torque of the BSG motor; determining a final gear shifting point according to the charging load coefficient, the basic gear shifting point and the BSG motor full-load charging gear shifting point, wherein a third vehicle speed corresponding to the final gear shifting point is between the first vehicle speed and the second vehicle speed; the shift is performed according to the final shift point. According to the gear shifting method of the vehicle, the gear shifting time can be correspondingly adjusted according to different loads under the condition that the additional load is added to the engine, so that the acceleration performance of the vehicle can be effectively improved, the booming sound of the engine is reduced, and the driving experience is improved.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a gear shifting method and system of a vehicle and the vehicle.
Background
Compared with a fuel automobile, a hybrid automobile generally includes an engine and a BSG (belt Starter Generator) motor, and the BSG motor sometimes needs to be driven by the engine to charge a load (a battery), that is: equivalent to the engine sometimes adding additional load. At this time, during gear shifting, due to the extra load added by the engine, compared with the gear shifting without the extra load, the acceleration of the whole vehicle is weakened, and meanwhile, the driving experience is affected due to the fact that the larger booming sound of the engine is possibly accompanied.
Disclosure of Invention
In view of the above, the present invention is directed to a gear shifting method for a vehicle. According to the method, under the condition that extra load is added to the engine, the gear shifting time can be correspondingly adjusted according to different load sizes, so that the acceleration performance of the vehicle can be effectively improved, the booming sound of the engine can be reduced, and the driving experience can be improved.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method of shifting a vehicle, the vehicle including an engine and a BSG motor, the method comprising: acquiring a basic gear shifting point corresponding to the current accelerator pedal opening and a BSG motor full-load charging gear shifting point, wherein a first vehicle speed corresponding to the BSG motor full-load charging gear shifting point is greater than a second vehicle speed corresponding to the basic gear shifting point; acquiring a charging load coefficient corresponding to the current charging torque of the BSG motor; determining a final gear shifting point according to the charging load coefficient, the basic gear shifting point and a BSG motor full-load charging gear shifting point, wherein a third vehicle speed corresponding to the final gear shifting point is between the first vehicle speed and the second vehicle speed; executing a shift according to the final shift point.
Further, the charging load factor is between 0 and 1, and the charging load factor increases with an increase in the current charging torque.
Further, the charging load factor is × 100% of the current charging torque of the BSG motor/the maximum available charging torque of the BSG motor.
Further, the final shift point is derived by differencing the base shift point × (1 charge load factor) + BSG electric machine full charge shift point × charge load factor.
Further, the acquiring a basic shift point corresponding to the current accelerator pedal opening and a BSG motor full-load charging shift point includes: inquiring a pre-stored basic gear shifting curve to obtain a basic gear shifting point corresponding to the current accelerator pedal opening degree; and inquiring a pre-stored full-load charging gear shifting curve to obtain a BSG motor full-load charging gear shifting point corresponding to the current accelerator pedal opening, wherein the basic gear shifting curve and the full-load charging gear shifting curve are obtained by pre-calibrating according to the accelerator pedal opening and the vehicle speed.
According to the gear shifting method of the vehicle, under the condition that the additional load is added to the engine, the gear shifting time can be correspondingly adjusted according to the difference of the load, so that the acceleration performance of the vehicle can be effectively improved, the booming sound of the engine can be reduced, and the driving experience can be improved.
A second object of the present invention is to propose a gear shift system for a vehicle. The system can correspondingly adjust the gear shifting moment according to the difference of the load size under the condition that the additional load is added to the engine, so that the acceleration performance of the vehicle can be effectively improved, the booming sound of the engine is reduced, and the driving experience is improved.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a gear shift system of a vehicle, the vehicle including an engine and a BSG motor, the system comprising: the system comprises a first obtaining module, a second obtaining module and a third obtaining module, wherein the first obtaining module is used for obtaining a basic gear shifting point corresponding to the current accelerator pedal opening and a BSG motor full-load charging gear shifting point, and a first vehicle speed corresponding to the BSG motor full-load charging gear shifting point is larger than a second vehicle speed corresponding to the basic gear shifting point; the second acquisition module is used for acquiring a charging load coefficient corresponding to the current charging torque of the BSG motor; and the control module is used for determining a final gear shifting point according to the charging load coefficient, the basic gear shifting point and a BSG motor full-load charging gear shifting point and executing gear shifting according to the final gear shifting point, wherein a third vehicle speed corresponding to the final gear shifting point is between the first vehicle speed and the second vehicle speed.
Further, the charging load factor is between 0 and 1, and the charging load factor increases with an increase in the current charging torque.
Further, the final shift point is derived by differencing the base shift point × (1 charge load factor) + BSG electric machine full charge shift point × charge load factor.
Further, the first obtaining module is configured to: inquiring a pre-stored basic gear shifting curve to obtain a basic gear shifting point corresponding to the current accelerator pedal opening degree; and inquiring a pre-stored full-load charging gear shifting curve to obtain a BSG motor full-load charging gear shifting point corresponding to the current accelerator pedal opening, wherein the basic gear shifting curve and the full-load charging gear shifting curve are obtained by pre-calibrating according to the accelerator pedal opening and the vehicle speed.
Compared with the prior art, the vehicle gear shifting system and the vehicle gear shifting method have the same advantages, and are not described again.
A third objective of the present invention is to provide a vehicle, which can adjust the shifting time according to the difference of the load when an additional load is added to the engine, so as to effectively improve the acceleration performance of the vehicle, reduce the booming sound of the engine, and improve the driving experience.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a vehicle provided with a gear shift system of the vehicle as described in any one of the above embodiments.
Compared with the prior art, the vehicle and the gear shifting system of the vehicle have the same advantages, and the detailed description is omitted.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a flow chart of a method of shifting a vehicle according to one embodiment of the present invention;
FIG. 2 is a schematic illustration of a vehicle according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a shift curve corresponding to a base shift point in a shifting method for a vehicle according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a shift curve corresponding to a basic shift point and a BSG motor full-load charging shift point in a vehicle shift method according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a method of shifting a vehicle to determine a final shift point in accordance with an embodiment of the present invention;
fig. 6 is a block diagram of a shift system of a vehicle according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
FIG. 1 is a flow chart of a method of shifting a vehicle according to one embodiment of the present invention.
Before describing a method of shifting a vehicle in accordance with an embodiment of the present invention, the vehicle will first be described, the vehicle including an engine and a BSG (Belt drive Starter Generator) motor. Namely: the vehicle is a hybrid vehicle, and as shown in fig. 2, the vehicle includes an engine, a BSG motor, an automatic transmission, and the like, wherein the engine transmits power with the BSG motor through a belt, for example: when the engine works, the BSG motor can be driven to charge a battery and the like, and the BSG motor can also drag the engine to start and the like.
As shown in fig. 1, a gear shifting method of a vehicle according to an embodiment of the present invention includes the steps of:
s101: and acquiring a basic gear shifting point corresponding to the current accelerator pedal opening and a BSG motor full-load charging gear shifting point, wherein the first vehicle speed corresponding to the BSG motor full-load charging gear shifting point is greater than the second vehicle speed corresponding to the basic gear shifting point.
Wherein, acquire basic shift point and the BSG motor full load of corresponding to current accelerator pedal aperture and charge the shift point, include: inquiring a pre-stored basic gear shifting curve to obtain a basic gear shifting point corresponding to the current accelerator pedal opening degree; and inquiring a pre-stored full-load charging gear shifting curve to obtain a BSG motor full-load charging gear shifting point corresponding to the current accelerator pedal opening.
In a specific example, the shift points are typically determined by vehicle speed and accelerator pedal opening, such that a plurality of shift points form a shift curve, such as: a shift curve corresponding to the 2 nd gear, a shift curve corresponding to the 3 rd gear, a shift curve corresponding to the 4 th gear and the like.
In addition, the upshift and the downshift correspond to different shift curves, and are referred to as an upshift curve and a downshift curve, respectively. As shown in fig. 3, a shift curve diagram is shown, wherein the abscissa represents the vehicle speed (km/h) and the ordinate represents the accelerator pedal opening, i.e., the accelerator opening. Wherein the solid line represents an upshift curve and the dashed line represents a downshift curve.
In fig. 3, a curve for 2-stage 1 downshift, a curve for 3-stage 2 downshift, a curve for 4-stage 3 downshift, and the like are indicated by left-to-right broken lines. Similarly, the left-right solid lines represent the 1 st gear upshift 2 th gear curve, the 2 nd gear upshift 3 th gear curve, the 3 rd gear upshift 4 th gear curve, and so on.
It should be noted that the shift curve shown in fig. 3 is a shift curve corresponding to the basic shift point.
Take 3-gear up and 4-gear down and 3-gear as examples. When the vehicle is in a 3-gear state, a coordinate point formed by the vehicle speed and the accelerator opening degree is positioned on the left side of a curve (solid line) of the 3-gear state, the vehicle keeps the 3-gear state unchanged, and when the coordinate point reaches the right side of the curve (solid line) of the 3-gear state, the transmission executes 3-gear up to a 4-gear state; when the vehicle is in the 4-gear, and a coordinate point formed by the vehicle speed and the accelerator opening degree is positioned on the right side of a curve (a dotted line) of the 4-gear, the vehicle keeps the 4-gear unchanged; when the coordinates are to the left of the curve for gear 4 (dashed line), the transmission executes a 4-gear downshift to gear 3.
In the above description, fig. 3 shows an example of shifting at a basic shift point, but since the BSG motor may be charging a load (battery), in such a case, the engine may add an extra load, and at this time, if shifting at the basic shift point, acceleration performance may be weakened, and in addition, the engine may be accompanied by a large booming sound, which may affect the driving experience.
Therefore, in the embodiment of the present invention, a BSG motor full-load charging shift point is introduced, that is: in the case of an engine with an additional load, the shift points are not shifted with the basic shift points, for example: when the BSG motor full load charges the battery and the like, the gear shifting is carried out according to the BSG motor full load charging gear shifting point, wherein under the condition that the opening degree of an accelerator pedal is not changed, the first vehicle speed corresponding to the BSG motor full load charging gear shifting point is larger than the second vehicle speed corresponding to the basic gear shifting point, and therefore the problems that the acceleration performance of the engine is weakened and the sound is loud due to extra load can be well improved.
As shown in fig. 4, the abscissa is the vehicle speed (km/h), and the ordinate is the accelerator pedal opening. The solid line represents an upshift curve for one gear, and the dashed line represents a downshift curve for one gear. The most left downshift curve corresponds to a basic shift point during downshift, and the most right downshift curve corresponds to a BSG motor full-load charging shift point during downshift; similarly, the leftmost upshift curve corresponds to the base shift point during an upshift, and the rightmost downshift curve corresponds to the BSG motor full charge shift point during an upshift.
It can be understood that the basic shift curve and the full-load charging shift curve are obtained by pre-calibration according to the opening degree of an accelerator pedal and the vehicle speed, namely: and an upshift curve and a downshift curve corresponding to the BSG motor full-load charging shift point and an upshift curve and a downshift curve corresponding to the basic shift point are calibrated in advance in modes of experiments and the like and are stored in the vehicle.
S102: a charging load factor corresponding to a current charging torque of the BSG motor is obtained.
In a specific example, the charging load factor is, for example, between 0 and 1, and the charging load factor increases with an increase in the current charging torque, wherein the charging load factor can be obtained by:
the charge load factor is × 100% of the current charge torque of the BSG motor/the maximum available charge torque of the BSG motor.
S103: and determining a final gear shifting point according to the charging load coefficient, the basic gear shifting point and the BSG motor full-load charging gear shifting point, wherein a third vehicle speed corresponding to the final gear shifting point is between the first vehicle speed and the second vehicle speed.
In a specific example, the final shift point may be differenced by:
final shift point is base shift point × (1-charge load factor) + BSG motor full charge shift point × charge load factor.
As shown in fig. 5, when the accelerator pedal opening is not changed, the vehicle speed corresponding to the basic shift point is 35 km/h, the vehicle speed corresponding to the BSG motor full load charging shift point is 71 km/h, and the charging load factor is 0.5, that is, when the vehicle speed is about half of the maximum available charging torque of the BSG motor, the final shift point is 35 × (1-0.5) +71 × 0.5.5 is 53, that is, when the accelerator pedal opening is about 40, the vehicle speed corresponding to the BSG motor full load charging shift point is 130 km/h, the charging load factor is 0.5, that is, when the vehicle speed is about 53, and when the vehicle speed corresponding to the basic shift point is 102 km/h, the vehicle speed corresponding to the BSG motor full load charging shift point is 130 km/h, the charging load factor is 0.5, that is about half of the maximum available charging torque of the BSG motor, the final shift point is 102 × (1-0.5), that is about 130 × 0.5 km/h, and when the accelerator pedal opening is about 116, the charging torque is about 116 m.
S104: the shift is performed according to the final shift point.
Taking the example shown in fig. 5, when the accelerator pedal opening is about 40 and the BSG motor has half the maximum available charging torque, the downshift is performed when the vehicle speed reaches about 53, and when the accelerator pedal opening is about 58 km/h and the BSG motor has half the maximum available charging torque, the upshift is performed when the vehicle speed reaches about 116 km/h.
When the charge load factor is equal to 1, the BSG is charged at full load, and the gear shift is performed at a full-load charge shift line (i.e., a BSG motor full-load charge shift point), and when the charge load factor is equal to 0, the BSG is not charged, and the gear shift is performed at a basic shift line (i.e., a basic shift point).
According to the gear shifting method of the vehicle, under the condition that the additional load is added to the engine, the gear shifting time can be adjusted correspondingly according to the difference of the load, so that the acceleration performance of the vehicle can be effectively improved, the booming sound of the engine can be reduced, and the driving experience can be improved.
Fig. 6 is a block diagram of a gear shifting system of a vehicle according to an embodiment of the present invention. As shown in fig. 6, a gear shift system 600 of a vehicle according to an embodiment of the present invention includes: a first acquisition module 610, a second acquisition module 620, and a control module 630.
The first obtaining module 610 is configured to obtain a basic shift point corresponding to a current accelerator pedal opening and a BSG motor full-load charging shift point, where a first vehicle speed corresponding to the BSG motor full-load charging shift point is greater than a second vehicle speed corresponding to the basic shift point. The second obtaining module 620 is used for obtaining a charging load factor corresponding to the current charging torque of the BSG motor. The control module 630 is configured to determine a final shift point according to the charging load factor, the basic shift point, and a BSG motor full-load charging shift point, and execute a shift according to the final shift point, where a third vehicle speed corresponding to the final shift point is between the first vehicle speed and the second vehicle speed.
In one embodiment of the present invention, the charging load factor is between 0 and 1, and the charging load factor increases as the current charging torque increases.
In one embodiment of the present invention, the final shift point is derived by differencing the final shift point by base shift point × (1-charge load factor) + BSG motor full charge shift point × charge load factor.
In an embodiment of the present invention, the first obtaining module 610 is configured to: inquiring a pre-stored basic gear shifting curve to obtain a basic gear shifting point corresponding to the current accelerator pedal opening degree; and inquiring a pre-stored full-load charging gear shifting curve to obtain a BSG motor full-load charging gear shifting point corresponding to the current accelerator pedal opening, wherein the basic gear shifting curve and the full-load charging gear shifting curve are obtained by pre-calibrating according to the accelerator pedal opening and the vehicle speed.
According to the gear shifting system of the vehicle, under the condition that the engine is additionally loaded, the gear shifting time can be correspondingly adjusted according to different loads, so that the acceleration performance of the vehicle can be effectively improved, the booming sound of the engine is reduced, and the driving experience is improved.
It should be noted that the specific implementation manner of the vehicle shift system according to the embodiment of the present invention is similar to the specific implementation manner of the vehicle shift method according to the embodiment of the present invention, and please refer to the description of the method part specifically, and no further description is provided here for reducing redundancy.
Further, an embodiment of the invention discloses a vehicle provided with a gear shift system of the vehicle as in any one of the embodiments described above. This vehicle can increase under the condition of extra load at the engine, according to the difference of load size, adjust the moment of shifting correspondingly to, can effectively improve the acceleration performance of vehicle and reduce the rumbling of engine, promote and drive experience.
In addition, other configurations and functions of the vehicle according to the embodiment of the present invention are known to those skilled in the art, and are not described herein in detail in order to reduce redundancy.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A method of shifting a vehicle, the vehicle including an engine and a BSG motor, the method comprising:
acquiring a basic gear shifting point corresponding to the current accelerator pedal opening and a BSG motor full-load charging gear shifting point, wherein a first vehicle speed corresponding to the BSG motor full-load charging gear shifting point is greater than a second vehicle speed corresponding to the basic gear shifting point;
acquiring a charging load coefficient corresponding to the current charging torque of the BSG motor;
determining a final gear shifting point according to the charging load coefficient, the basic gear shifting point and a BSG motor full-load charging gear shifting point, wherein a third vehicle speed corresponding to the final gear shifting point is between the first vehicle speed and the second vehicle speed;
executing a shift according to the final shift point.
2. The shifting method of a vehicle according to claim 1, characterized in that the charge load factor is located between 0 and 1, and the charge load factor increases as the current charge torque increases.
3. The shifting method of a vehicle according to claim 2, wherein the charge load factor is × 100% of the current charge torque of the BSG motor/the maximum available charge torque of the BSG motor.
4. A shifting method of a vehicle according to any one of claims 1-3, characterized in that the final shift point is obtained by difference,
the final shift point is base shift point × (1-charge load factor) + BSG motor full charge shift point × charge load factor.
5. The shift method of a vehicle according to claim 1, wherein said obtaining a base shift point and a BSG motor full charge shift point corresponding to a current accelerator pedal opening degree comprises:
inquiring a pre-stored basic gear shifting curve to obtain a basic gear shifting point corresponding to the current accelerator pedal opening degree;
inquiring a pre-stored full-load charging gear shifting curve to obtain a BSG motor full-load charging gear shifting point corresponding to the current accelerator pedal opening degree,
the basic gear shifting curve and the full-load charging gear shifting curve are obtained by pre-calibrating according to the opening degree of an accelerator pedal and the vehicle speed.
6. A gear shift system of a vehicle, the vehicle including an engine and a BSG motor, the system comprising:
the system comprises a first obtaining module, a second obtaining module and a third obtaining module, wherein the first obtaining module is used for obtaining a basic gear shifting point corresponding to the current accelerator pedal opening and a BSG motor full-load charging gear shifting point, and a first vehicle speed corresponding to the BSG motor full-load charging gear shifting point is larger than a second vehicle speed corresponding to the basic gear shifting point;
the second acquisition module is used for acquiring a charging load coefficient corresponding to the current charging torque of the BSG motor;
and the control module is used for determining a final gear shifting point according to the charging load coefficient, the basic gear shifting point and a BSG motor full-load charging gear shifting point and executing gear shifting according to the final gear shifting point, wherein a third vehicle speed corresponding to the final gear shifting point is between the first vehicle speed and the second vehicle speed.
7. The vehicle shift system according to claim 6, wherein the charge load factor is between 0 and 1, and the charge load factor increases as the current charge torque increases.
8. The shift system of a vehicle according to claim 6 or 7, characterized in that the final shift point is obtained by difference,
the final shift point is base shift point × (1-charge load factor) + BSG motor full charge shift point × charge load factor.
9. The vehicle shifting system of claim 6, wherein the first obtaining module is configured to:
inquiring a pre-stored basic gear shifting curve to obtain a basic gear shifting point corresponding to the current accelerator pedal opening degree;
inquiring a pre-stored full-load charging gear shifting curve to obtain a BSG motor full-load charging gear shifting point corresponding to the current accelerator pedal opening degree,
the basic gear shifting curve and the full-load charging gear shifting curve are obtained by pre-calibrating according to the opening degree of an accelerator pedal and the vehicle speed.
10. A vehicle characterized by being provided with a gear shift system of a vehicle according to any one of claims 6-9.
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| CN201811590002.5A CN111361565B (en) | 2018-12-25 | 2018-12-25 | Vehicle gear shifting method and system and vehicle |
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| CN201811590002.5A CN111361565B (en) | 2018-12-25 | 2018-12-25 | Vehicle gear shifting method and system and vehicle |
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Cited By (1)
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| CN114863587A (en) * | 2022-04-29 | 2022-08-05 | 一汽奔腾轿车有限公司 | Method for offline acquisition and evaluation of gear shifting rule of hydraulic mechanical automatic transmission |
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