CN110502763B - Matching design method for reducing torsional vibration of drive train - Google Patents
Matching design method for reducing torsional vibration of drive train Download PDFInfo
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- CN110502763B CN110502763B CN201810466768.6A CN201810466768A CN110502763B CN 110502763 B CN110502763 B CN 110502763B CN 201810466768 A CN201810466768 A CN 201810466768A CN 110502763 B CN110502763 B CN 110502763B
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The application discloses a matching design method for reducing drive train torsional vibration. The method comprises the following steps: a) Determining a development target of the torsional vibration of the power train; b) Under the condition of considering fuel economy, the speed ratio of the gearbox is increased; c) Calculating the fluctuation of the rotating speed of the output end of the transmission under the ignition order; calculating an engine torque limit value meeting the torsional vibration development target requirement of a transmission system and a corresponding minimum sliding friction rotating speed of a locking clutch; d) Evaluating a dynamic property corresponding to the engine torque limit; e) Judging an engine speed interval requiring forced opening of a locking clutch of the hydraulic torque converter based on the durability requirement of the input shaft; f) Optimizing one or more of the following in view of fuel economy and driving comfort: the control method comprises a torque converter locking clutch slip control strategy, a gear shifting strategy and an engine torque control strategy. According to the method, the torsional vibration condition of the whole vehicle transmission system can be systematically evaluated and reasonably matched at the initial stage of the whole vehicle development.
Description
Technical Field
The invention relates to the field of automobiles, in particular to a matching design method for reducing torsional vibration of a transmission system.
Background
The transmission system torsional vibration is common in vehicle NVH, such as gearbox knocking, vehicle shaking, transient load impact sound, clutch flutter and the like, the problem generation mechanism is complex and the solving difficulty is high, and meanwhile, different transmission system NVH problems are reflected by different types of gearboxes such as MT, AT, DCT and the like.
The engine is a mechanical device for converting chemical energy of fuel into mechanical energy by means of a piston crank connecting rod mechanism, and the size of effective torque Tm output outwards is determined by the area enclosed by a dynamic torque Ti curve. The relationship between Tm and Ti can be obtained by the following equation 1).
Meanwhile, for the inertia system (inertia I) of the crank mechanism, the fluctuation of Ti means the fluctuation of the rotation speed wi, and the relationship therebetween can be expressed by the equation 2):
from this, it is understood that the larger the dynamic torque Ti, the larger the rotation speed fluctuation w.
The torsional vibration of the transmission system is related to more factors, such as engine rotating speed fluctuation, transmission system inertia, vibration isolation rate of a vibration absorber, speed ratio of a transmission, engine torque, slipping rotating speed of a locking clutch of a hydraulic torque converter, gear shifting strategy of the transmission and the like, and influences interaction among the factors, so that a correct matching design method is difficult to master from the aspects of low-cost development and balance of vibration noise, fuel economy, drivability, dynamic performance, durability and other performances of the whole vehicle.
Disclosure of Invention
The invention provides a matching design method for reducing torsional vibration of a transmission system, which can perform system evaluation and reasonable matching on the torsional vibration condition of the transmission system of a whole vehicle at the initial stage of development of the whole vehicle.
According to one aspect of the present invention, a matching design method for reducing driveline torsional vibrations is provided, the method comprising the steps of:
a) Determining a development target of torsional vibration of the transmission system through an in-vehicle vibration noise index and a torsional vibration transfer function of the whole vehicle response;
b) Under the condition of considering fuel economy, the speed ratio of the gearbox is increased;
c) Calculating the speed fluctuation of the output end of the transmission under the ignition order under the conditions of different speeds of the input shaft of the transmission, the torque of the engine and the slip speed of a lockup clutch of the hydraulic torque converter; under the conditions of considering the sliding friction work of a locking clutch of the hydraulic torque converter and ensuring the durability of an input shaft, calculating an engine torque limit value meeting the torsional vibration development target requirement of a transmission system and a corresponding minimum sliding friction rotating speed of the locking clutch;
d) Evaluating the dynamic property corresponding to the engine torque limit value, and if the dynamic property requirement cannot be met, increasing the rotational inertia of an engine rotating reciprocating system and a transmission system and optimizing the vibration isolation rate of a torsional vibration damper of the hydraulic torque converter;
e) Calculating the inherent mode of a transmission system, and judging an engine rotating speed interval requiring the locking clutch of the hydraulic torque converter to be forcibly opened by combining the frequency and the vibration mode of the transmission system, the durability requirement of an input shaft of the transmission and the rotating speed fluctuation condition of the output end of the transmission under the maximum engine torque limit value;
f) Optimizing one or more of the following in view of fuel economy and driving comfort: a torque converter lockup clutch slip control strategy, a shift strategy, and an engine torque control strategy.
According to the matching design method for reducing the torsional vibration of the transmission system, provided by the embodiment of the invention, the rotating speed fluctuation of the output end of the transmission at the ignition order is set as the development target of the torsional vibration of the transmission system through the vibration noise index in the vehicle and the torsional vibration transfer function of the response of the whole vehicle.
According to one embodiment of the present invention, in step c), the transmission output speed fluctuation in the ignition order is calculated by a power train torsional vibration analysis model, which takes into account one or more of the following parameters: dynamic torque ripple at different steady state torques/speeds of the engine, rotational inertia of the engine rotating reciprocating system, rotational inertia of the drive train, torque converter lock-up clutch control logic, drive train torsional stiffness and corresponding damping, and transmission speed ratio.
According to one embodiment of the invention, the matching design method for reducing torsional vibration of the power train is provided, and the rotational inertia of the power train comprises the rotational inertia of a hydraulic torque converter, a transmission, half shafts and wheels.
According to one embodiment of the invention, the matching design method for reducing the torsional vibration of the power train is provided, and the torsional rigidity of the power train comprises the rigidity of a damping spring of a hydraulic torque converter, the equivalent rigidity of a transmission, the rigidity of a half shaft and the rigidity of a tire.
According to one embodiment of the invention, the matching design method for reducing the torsional vibration of the power train is characterized in that in the step f), the optimization of the slip control strategy of the lockup clutch of the hydraulic torque converter comprises the following steps: the clutch is opened and/or the degree of clutch slip is increased during the complained speed interval (a speed interval that does not meet the transmission input shaft durability set target or the in-vehicle rattle noise set target).
According to one embodiment of the invention, the matching design method for reducing the torsional vibration of the power train is characterized in that in the step f), the optimization of the gear shifting strategy comprises the following steps: the shift point is increased.
According to one embodiment of the invention, the matching design method for reducing the torsional vibration of the power train is characterized in that in the step f), the optimization of the engine torque control strategy comprises the following steps: the engine torque of the complaining speed interval is reduced.
The beneficial effects of the invention include: the method can provide reasonable basis for matching engine rotation reciprocating system rotation with the rotational inertia of a transmission system, the rigidity of a damping spring of the hydraulic torque converter, the selection of a main reduction ratio of the transmission, the gear shifting of the transmission, a locking clutch control strategy of the hydraulic torque converter, an engine torque control strategy and the like.
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The disclosure of the present invention is illustrated with reference to the accompanying drawings. It is to be understood that the drawings are designed solely for the purposes of illustration and not as a definition of the limits of the invention. In the drawings, like reference numerals are used to refer to like elements throughout. Wherein:
FIG. 1 schematically illustrates a flow of a proposed matching design method for reducing driveline torsional vibrations, according to one embodiment of the present invention;
FIG. 2 shows engine and transmission output speed fluctuation curves;
FIG. 3 shows engine torque limit curves before and after inertia addition;
fig. 4 shows a transmission shift control strategy.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention. Therefore, the following detailed description and the accompanying drawings are merely illustrative of the technical aspects of the present invention, and should not be construed as all of the present invention or as limitations or limitations on the technical aspects of the present invention.
According to one embodiment of the invention, shown in combination with fig. 1, a matching design method for reducing torsional vibration of a vehicle power train equipped with a hydromechanical automatic transmission is switched from the perspective of balancing the overall vehicle performance such as vibration noise, fuel economy, drivability, dynamics, durability, and the like, and comprises the following steps:
the method comprises the following steps: and determining a development target of the torsional vibration of the transmission system (for example, setting a specific torsional vibration value of the torsional vibration of the transmission system) through the vibration noise index in the vehicle and the torsional vibration transfer function responded by the whole vehicle, for example, selecting the rotation speed fluctuation of the output end of the transmission under the ignition order as a matching development index.
Step two: the fuel economy is comprehensively considered, and the speed ratio of the gearbox is properly increased to ensure that the rotating speed of the engine is increased under the same speed/gear so as to reduce the fluctuation of the rotating speed of the output end of the transmission; and the output torque of the engine can be further reduced under the condition of maintaining the same wheel edge torque, so that the fluctuation of the rotating speed of the output end of the transmission is reduced.
Step three: a torsional vibration analysis model of a finished automobile transmission system is established through a mathematical formula or commercial software (such as LMS/Amesim, AVL/Power Unit, mathworks/MATLAB and the like), and the model needs to consider dynamic torque fluctuation of an engine under different steady-state torques/rotating speeds, rotational inertia of a rotating reciprocating system of the engine, rotational inertia of a transmission system (a hydraulic torque converter/a transmission/a half shaft/wheels), control logic of a locking clutch of the hydraulic torque converter, torsional rigidity of each part of the transmission system (the rigidity of a damping spring of the hydraulic torque converter, equivalent rigidity of the transmission, the rigidity of the half shaft and a tire and the like) and corresponding damping, speed ratio of a gearbox and the like, and calculate the fluctuation of the rotating speed of the output end of the transmission under different ignition orders of the rotating speed of an input shaft of the transmission/the torque of the engine/the sliding speed of the locking clutch of the hydraulic torque converter. And calculating an engine torque limit value and a corresponding minimum slipping rotating speed of the lockup clutch which meet the development target requirement of the torsional vibration of the power train in an initial power train hardware state within the maximum torque limit range of the slipping work of the lockup clutch of the hydraulic torque converter and the maximum torque limit range of ensuring the durability of the input shaft of the transmission, and evaluating the dynamic property corresponding to the engine torque limit value.
Step four: if the dynamic requirement cannot be met, the rotational inertia of transmission parts such as an engine rotary reciprocating system and a hydraulic torque converter needs to be increased, the vibration isolation rate of a torsional vibration damper of the hydraulic torque converter needs to be optimized, and an engine torque limit value and a corresponding minimum slipping rotation speed of the lockup clutch, which simultaneously meet the torsional vibration requirement and the dynamic requirement of the transmission system, are obtained on the basis of the updated hardware state of the transmission system.
Step five: and calculating the inherent mode of the transmission system of the whole vehicle, and preliminarily judging the corresponding engine speed interval requiring the locking clutch of the hydraulic torque converter to be forcibly opened by combining the frequency/vibration mode of the transmission system, the durability requirement of the input shaft of the transmission and the condition of the speed fluctuation of the output end of the transmission under the maximum engine torque limit value.
Step six: in consideration of the fuel economy and driving comfort of the whole vehicle, a torque converter lockup clutch slip control strategy (complaining about opening a clutch in a rotating speed range or properly increasing the degree of slip of the clutch)/a gear shifting strategy (properly increasing a gear shifting point) and an engine torque control strategy (properly reducing the complained engine torque in the rotating speed range) are optimized according to a torsional vibration index of a transmission system.
The method aims at the fluctuation of the rotating speed and the torque of the engine, takes the development of meeting the vibration noise of the whole vehicle as a main target, comprehensively evaluates other properties of the whole vehicle such as fuel economy, drivability, dynamic property and the like, and develops the matching design of a transmission system of the whole vehicle from five aspects such as a main reduction ratio of a speed changer, engine torque control, a rotary reciprocating system of the engine, the rotational inertia of a transmission system, the design of a damping spring of a hydraulic torque converter, the gear shifting of the speed changer, a locking clutch control strategy of the hydraulic torque converter and the like. According to the matching design method for reducing the torsional vibration of the transmission system, the system evaluation and reasonable matching of the torsional vibration condition of the transmission system of the whole vehicle at the initial stage of development of the whole vehicle can be facilitated, and unnecessary engineering change at the later stage is avoided.
One example of a matching design method for reducing driveline torsional vibrations, according to an embodiment of the present invention, is as follows:
the method comprises the following steps: and determining a torsional vibration development target of the transmission system through the vibration noise index in the vehicle and the torsional vibration transfer function of the whole vehicle response.
Step two: the main speed reduction ratio is increased by 10%, the predicted lowest engine speed of the 4/5/6 gear is increased by 10%, and the fluctuation of the speed of the output end of the transmission is improved by more than 20%. Fig. 2 is a graph of fluctuation of the rotational speed of the output ends of the engine and the transmission with the change of the rotational speed under the 5-speed engine torque of 150Nm, in which the abscissa represents the rotational speed of the engine, and the ordinate represents the fluctuation of the rotational speed, the solid line is the fluctuation curve of the rotational speed of the engine, and the broken line is the fluctuation curve of the rotational speed of the output end of the transmission. It can be seen from the plot of engine revolutions from 1250 to 1400 revolutions that increasing engine speed at the same torque reduces the corresponding transmission output speed ripple, which can be explained with reference to fig. 2.
Step three: and calculating the limited torque of the engine and the corresponding minimum slipping rotating speed of the lockup clutch of the hydraulic transmission under the conditions of the main speed reduction ratio and initial power train parameters (inertia/rigidity/damping).
Step four: increasing the moment of inertia at the engine end of the engine flexplate and torque converter equivalent, correspondingly increases the engine torque limit by up to about 20Nm, with 5 th gear as shown, for example, in fig. 3, where the abscissa represents the engine speed and the ordinate represents the engine torque limit.
Step five: based on the driveline modal and driveline torsional response at torque capacity calculations, taking transmission input shaft durability into account, it was found that below engine speed 900 rpm, the torque converter lock-up clutch had to be forced open.
Step six: based on the requirement of not influencing fuel economy, a gear shifting point is properly increased on a transmission gear shifting control strategy, so that the torsional vibration of a transmission system is further reduced, and the vibration in a vehicle is improved, as shown in fig. 4 (taking 5-gear as an example), wherein the abscissa represents the opening degree of an accelerator, and the ordinate represents the vehicle speed.
According to the process, the torsional vibration of the whole vehicle transmission system and the vibration in the vehicle are effectively controlled.
The method steps of the present invention are not limited to the above-described step sequence, and the sequence of each step may be modified accordingly. The technical scope of the present invention is not limited to the above description, and those skilled in the art can make various changes and modifications to the above-described embodiments without departing from the technical spirit of the present invention, and such changes and modifications should fall within the protective scope of the present invention.
Claims (7)
1. A matching design method for reducing driveline torsional vibrations, the method comprising the steps of:
a) Setting the fluctuation of the rotating speed of the output end of the transmission at the ignition order as the development target of the torsional vibration of the transmission system through the vibration noise index in the vehicle and the torsional vibration transfer function of the response of the whole vehicle;
b) Under the condition of considering fuel economy, the speed ratio of the gearbox is increased;
c) Calculating the speed fluctuation of the output end of the transmission under the ignition order under the conditions of different speeds of the input shaft of the transmission, the torque of the engine and the slip speed of a lockup clutch of the hydraulic torque converter; under the conditions of considering the sliding friction work of a locking clutch of the hydraulic torque converter and ensuring the durability of an input shaft, calculating an engine torque limit value meeting the torsional vibration development target requirement of a transmission system and a corresponding minimum sliding friction rotating speed of the locking clutch;
d) Evaluating the dynamic property corresponding to the engine torque limit, and if the dynamic property requirement cannot be met, increasing the rotational inertia of the engine rotary reciprocating system and the transmission system and optimizing the vibration isolation rate of the torsional vibration damper of the hydraulic torque converter;
e) Calculating the inherent mode of a transmission system, and judging an engine rotating speed interval requiring the locking clutch of the hydraulic torque converter to be forcibly opened by combining the frequency and the vibration mode of the transmission system, the durability requirement of an input shaft of the transmission and the rotating speed fluctuation condition of the output end of the transmission under the maximum engine torque limit value;
f) Optimizing one or more of the following in view of fuel economy and driving comfort: the control method comprises a torque converter locking clutch slip control strategy, a gear shifting strategy and an engine torque control strategy.
2. A matching design method for reducing driveline torsional vibrations according to claim 1, characterized in that in step c) the transmission output speed fluctuation at the firing order is calculated by a driveline torsional vibration analysis model taking into account one or more of the following parameters: dynamic torque ripple at different steady state torques/speeds of the engine, rotational inertia of the engine rotating reciprocating system, rotational inertia of the drive train, torque converter lock-up clutch control logic, drive train torsional stiffness and corresponding damping, and transmission speed ratio.
3. The matching design method for reducing driveline torsional vibrations of claim 2, wherein the rotational inertia of the driveline comprises a torque converter, a transmission, half shafts, and rotational inertia of wheels.
4. The match design method for reducing driveline torsional vibrations of claim 2, wherein the driveline torsional stiffness comprises a torque converter damper spring rate, a transmission equivalent rate, a half axle rate, and a tire rate.
5. The matching design method for reducing driveline torsional vibration according to claim 1, wherein optimizing the torque converter lock-up clutch slip control strategy in step f) comprises: opening the clutch and/or increasing the degree of clutch slip during the complained speed interval.
6. The matching design method for reducing driveline torsional vibrations according to claim 1, wherein in step f), optimizing the gear shift strategy comprises: the shift point is increased.
7. The matching design method for reducing driveline torsional vibrations of claim 1, wherein in step f), optimizing an engine torque control strategy comprises: the engine torque of the complaining speed interval is reduced.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111891106B (en) * | 2020-07-29 | 2021-08-13 | 中国第一汽车股份有限公司 | Power assembly control method for reducing torsional vibration of transmission system |
| CN112733070A (en) * | 2021-01-25 | 2021-04-30 | 江铃汽车股份有限公司 | Method for sensitively controlling low-speed rumble and gearbox knocking sound by using low-speed torsion |
| CN113217212B (en) * | 2021-05-24 | 2022-08-12 | 中联重科土方机械有限公司 | Method for determining gear rotating speed, processor and engineering machinery |
| CN113468661B (en) * | 2021-06-28 | 2022-06-07 | 重庆长安汽车股份有限公司 | Method for calculating torsional vibration isolation rate of unlocking and slip working condition of hydraulic torque converter and readable storage medium |
| CN115306891B (en) * | 2022-06-30 | 2023-10-20 | 东风汽车集团股份有限公司 | Debugging method, control system and storage medium of gear shifting equipment |
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| CN106872174A (en) * | 2017-02-22 | 2017-06-20 | 重庆理工大学 | Automobile transmission rack Knock test engine transient cycle moment of torsion analogy method |
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| CN101230917A (en) * | 2007-01-25 | 2008-07-30 | 本田技研工业株式会社 | Control device for automatic transmission for vehicle |
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