CN115539626A - Transmission economical gear selection method and device, gear shifting recommendation method and system - Google Patents
Transmission economical gear selection method and device, gear shifting recommendation method and system Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
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- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/44—Inputs being a function of speed dependent on machine speed of the machine, e.g. the vehicle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
- F16H63/42—Ratio indicator devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/14—Inputs being a function of torque or torque demand
- F16H2059/147—Transmission input torque, e.g. measured or estimated engine torque
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- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H2059/366—Engine or motor speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0012—Transmission control for optimising power output of driveline
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
- F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
- F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
- F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
- F16H2061/022—Calculation or estimation of optimal gear ratio, e.g. best ratio for economy drive or performance according driver preference, or to optimise exhaust emissions
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
- F16H63/40—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism comprising signals other than signals for actuating the final output mechanisms
- F16H63/42—Ratio indicator devices
- F16H2063/426—Ratio indicator devices with means for advising the driver for proper shift action, e.g. prompting the driver with allowable selection range of ratios
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention belongs to the technical field of transmissions, and particularly provides a transmission economical gear selection method, a transmission economical gear selection device, a gear shifting recommendation method and a gear shifting recommendation system, wherein the method comprises the following steps: configuring external characteristics of a prime motor and external characteristics of a speed changer; constructing a power transmission efficiency evaluation model of the vehicle driving system by using the configured external characteristics of the prime motor and the external characteristics of the transmission; collecting the driving required torque and the speed of the vehicle; calculating potential gear matching of the prime mover speed-torque and the transmission; calculating the power transmission efficiency of each potential gear by using a power transmission efficiency evaluation model of a vehicle driving system; searching a gear with the highest power transmission efficiency according to a calculation result; and sending transmission economic gear information by taking the highest gear as an economic gear required by the current driving of the transmission. The overall optimization of the power transmission efficiency of the vehicle driving system can be realized, and the vehicle economy is further improved.
Description
Technical Field
The invention relates to the technical field of transmissions, in particular to a transmission economical gear selection method, a transmission economical gear selection device, a gear shifting recommendation method and a gear shifting recommendation system.
Background
The energy consumption and economy of the vehicle are one of the most concerned problems in the vehicle industry, and the improvement of the energy conversion efficiency of a prime mover and the reasonable matching of a power driving system are main measures for improving the economy of the vehicle.
The existing drive system matching method is realized by switching the gears of the transmission to enable the prime mover to work in a high-efficiency range of the prime mover on the premise of ensuring the vehicle dynamic requirement, and the influence of the transmission efficiency of the transmission on the power transmission efficiency of the vehicle drive system is not considered.
However, there are significant differences in transmission efficiency between the different gears of the transmission; especially for the commercial vehicle multi-gear transmission with an overdrive gear, the transmission efficiency difference between the direct gear and the overdrive gear exceeds 2 percent. The gear matching is performed by neglecting the transmission efficiency of the transmission, which may cause that the vehicle driving system cannot work at the most efficient working point, resulting in lower vehicle economy and waste of energy.
Disclosure of Invention
The transmission efficiency of different gears of the transmission is obviously different; especially for the commercial vehicle multi-gear transmission with an overdrive gear, the transmission efficiency difference between the direct gear and the overdrive gear exceeds 2 percent. The invention provides a method and a device for selecting economical gears of a transmission, a gear shifting recommendation method and a gear shifting recommendation system, which are used for solving the problems that a vehicle driving system cannot work at the most efficient working point of the transmission, and the vehicle economy is low and energy is wasted.
In a first aspect, the invention provides a method for selecting an economical gear of a transmission, comprising the following steps:
configuring external characteristics of a prime motor and external characteristics of a transmission; the external characteristics of the prime motor comprise the rotation speed-torque-energy conversion efficiency characteristics of the prime motor, and the external characteristics of the transmission comprise the gear-rotation speed-torque-transmission efficiency characteristics of the transmission;
constructing a power transmission efficiency evaluation model of the vehicle driving system by using the configured external characteristics of the prime mover and the external characteristics of the transmission;
collecting the driving demand torque and the vehicle speed of the vehicle;
calculating potential gear matching of the prime mover speed-torque and the transmission;
calculating the power transmission efficiency of each potential gear by using a power transmission efficiency evaluation model of a vehicle driving system;
searching a gear with the highest power transmission efficiency according to a calculation result;
and sending transmission economic gear information by taking the highest gear as an economic gear required by the current driving of the transmission.
Preferably, the step of deriving the prime mover external characteristic and the transmission external characteristic comprises:
and obtaining the characteristics of prime motor rotation speed-torque-energy conversion efficiency and the characteristics of transmission gear-rotation speed-torque-transmission efficiency by a bench test or simulation analysis method.
Preferably, in the step of constructing the vehicle drive system power transmission efficiency evaluation model using the acquired prime mover external characteristic and the transmission external characteristic, the constructed vehicle drive system power transmission efficiency evaluation model is as shown in formula (1):
wherein the content of the first and second substances,
indicates the power transmission efficiency of the vehicle drive system,
in order to achieve the energy conversion efficiency of the prime mover,
is a transmission
The transmission efficiency of the gear is improved,
representing the energy conversion efficiency of the remaining components of the vehicle drive system.
Preferably, the step of calculating the power transmission efficiency of each potential gear using the vehicle drive system power transmission efficiency evaluation model includes:
presetting a mapping relation table of prime mover energy conversion efficiency and prime mover rotating speed-torque;
presetting a mapping relation table of transmission efficiency of the transmission and gear-rotating speed-torque of the transmission;
according to the running speed and the torque of the prime motor and the gear position of the transmission, selecting corresponding prime motor energy conversion efficiency and transmission efficiency of the transmission by using the mapping relation table;
and calculating the power transmission efficiency of the vehicle driving system by using the power transmission efficiency evaluation model of the vehicle driving system.
Preferably, the step of searching for the gear with the highest power transmission efficiency based on the calculation result includes:
selecting a gear with the highest power transmission efficiency of a vehicle driving system according to a formula (2);
wherein, the first and the second end of the pipe are connected with each other,
respectively representing the minimum value and the maximum value of the vehicle driving demand speed;
respectively representing the minimum value and the maximum value of the vehicle driving demand torque;
indicating the number of gears in the transmission.
Indicating that the vehicle is
The speed of the vehicle in the down gear,
indicating that the vehicle is
Drive torque in gear.
The output rotational speed of the prime mover is indicated,
representing the prime mover output torque.
The radius of the wheel is indicated by the radius of the wheel,
the transmission is shown in
The transmission ratio of the gear to be shifted,
the gear ratio of the other speed reducing devices such as a main speed reducer, a wheel-side speed reducer and the like is shown.
In a second aspect, the technical scheme of the invention provides a transmission economic gear selection device, which comprises a configuration module, a model creation module, a second calculation module, an acquisition module, a first calculation module, a comparison module and a recommendation module;
a configuration module for configuring external characteristics of the prime mover and the transmission; the external characteristics of the prime motor comprise the rotation speed-torque-energy conversion efficiency characteristics of the prime motor, and the external characteristics of the transmission comprise the gear-rotation speed-torque-transmission efficiency characteristics of the transmission;
the model creating module is used for constructing a power transmission efficiency evaluation model of the vehicle driving system by using the acquired external characteristics of the prime mover and the transmission;
the acquisition module is used for acquiring the driving demand torque and the vehicle speed of the vehicle;
the first calculation module is used for calculating potential gears matched with the prime mover speed-torque and the transmission;
the second calculation module is used for calculating the power transmission efficiency of each potential gear by using the power transmission efficiency evaluation model of the vehicle driving system;
the comparison module is used for searching a gear with the highest power transmission efficiency in the calculated power transmission efficiencies of the vehicle driving system under each potential gear;
and the recommending module is used for sending the economical gear information of the transmission by taking the highest gear as the economical gear of the current driving requirement of the transmission.
Preferably, the model creating module is used for obtaining the prime mover rotation speed-torque-energy conversion efficiency characteristic and the transmission gear-rotation speed-torque-transmission efficiency characteristic through a bench test or simulation analysis method.
Preferably, the model creation module constructs a vehicle drive system power transmission efficiency evaluation model as shown in formula (1):
wherein the content of the first and second substances,
indicates the power transmission efficiency of the vehicle drive system,
for the energy conversion efficiency of the prime mover,
is a transmission
The transmission efficiency of the gear is improved,
representing the energy conversion efficiency of the remaining components of the vehicle drive system.
Preferably, the second calculation module comprises a first setting unit, a second setting unit, a selection unit and a calculation unit;
the first setting unit is used for presetting a mapping relation table of prime motor energy conversion efficiency and prime motor rotating speed-torque;
the second setting unit is used for presetting a mapping relation table of transmission efficiency and transmission gear-rotating speed-torque;
the selection unit is used for selecting corresponding prime mover energy conversion efficiency and transmission efficiency of the transmission by utilizing the mapping relation table according to the running rotating speed and the torque of the prime mover and the gear position of the transmission;
and the calculating unit is used for calculating the power transmission efficiency of the vehicle driving system by using the power transmission efficiency evaluation model of the vehicle driving system.
Preferably, the comparison module is used for selecting the gear with the highest power transmission efficiency of the vehicle driving system according to the formula (2);
wherein, the first and the second end of the pipe are connected with each other,
respectively representing the minimum value and the maximum value of the vehicle driving demand speed;
respectively representing the minimum value and the maximum value of the vehicle driving demand torque;
indicating the number of gears in the transmission.
Indicating that the vehicle is
The speed of the vehicle in the gear-down state,
indicating that the vehicle is
Drive torque in gear.
The output rotational speed of the prime mover is indicated,
representing the prime mover output torque.
The radius of the wheel is indicated by the radius of the wheel,
the transmission is shown in
The transmission ratio of the gear to be shifted,
the gear ratio of the other speed reducing devices such as a main speed reducer, a wheel-side speed reducer and the like is shown.
In a third aspect, the technical solution of the present invention provides a transmission gear shift recommendation method, including the following steps:
obtaining economic gear information, wherein the economic gear information is the transmission economic gear information sent by the transmission economic gear selection method in the first aspect;
and displaying the acquired economic gear information on a vehicle instrument panel.
In a fourth aspect, the technical solution of the present invention further provides a transmission gear shifting recommendation system, including an economical gear selection device, a control module and a display module;
the control module is respectively in communication connection with the economical gear selection device and the display module;
the economical gear selection device is the economical gear selection device of the transmission in the second aspect;
the control module is used for acquiring economic gear information under the current driving requirement output by the economic gear selection device and outputting the acquired economic gear information to the display module;
and the display module is used for displaying the gear with the highest power transmission efficiency of the vehicle driving system on the vehicle instrument panel.
According to the technical scheme, the invention has the following advantages: the power transmission efficiency of the vehicle driving system under the potentially matched gear can be predicted through the power transmission efficiency evaluation model of the vehicle driving system, and the gear of the transmission which enables the power transmission efficiency of the vehicle driving system to be the highest is given. Accurate selection of economical gears of the transmission is achieved. Compared with the prior art that only the prime mover is operated in the high-efficiency interval to switch the gears of the transmission, the method provided by the invention can realize the global optimization of the power transmission efficiency of the vehicle driving system, and further improve the vehicle economy.
In addition, the invention has reliable design principle, simple structure and very wide application prospect.
Therefore, compared with the prior art, the invention has prominent substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
In order to more clearly illustrate the embodiments or prior art solutions of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic flow diagram of a method of one embodiment of the present invention.
FIG. 2 is a gear-rotational speed-transmission efficiency diagram of a transmission under a certain torque condition, obtained according to an embodiment of the present application;
FIG. 3 is a graph of rotational speed, torque and transmission efficiency of a transmission in a gear condition obtained according to an embodiment of the present disclosure;
fig. 4 is a graph of rotational speed-torque-energy conversion efficiency of a prime mover obtained according to an embodiment of the present application;
fig. 5 is a schematic block diagram of an apparatus of one embodiment of the present invention.
FIG. 6 is a schematic block diagram of a system of one embodiment of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The economical gear selection method, the gear shifting recommendation method, the device and the system of the transmission provided by the embodiment of the invention are obtained based on test, modeling calculation and logic judgment, and the economical gear of the vehicle transmission can be selected better. The general idea of the selection method of the embodiment of the invention is as follows: firstly, acquiring external characteristics of energy conversion efficiency/transmission efficiency of a vehicle driving system; a powertrain efficiency evaluation model of the vehicle drive system is then established. Meanwhile, acquiring the required torque and speed of the vehicle; the potential transmission gear matching the prime mover is then calculated. Then, calculating the power transmission efficiency of the vehicle driving system under each potential gear of the transmission; the transmission gear with the highest power transmission efficiency of the vehicle drive system is selected as the economical gear of the transmission.
Example 1
In the embodiment, a 12-gear transmission with an overdrive gear is taken as an example, and the economical gear of the transmission is selected according to the step flow of the economical gear selection method of the transmission shown in fig. 1.
As shown in fig. 1, an economical gear selection method for a transmission provided by an embodiment of the present application includes:
s100: the method includes configuring prime mover external characteristics and transmission external characteristics, wherein the prime mover external characteristics include speed-torque-energy conversion efficiency characteristics of the prime mover, and the transmission external characteristics include gear-speed-torque-transmission efficiency characteristics of the transmission.
The method comprises the steps that the energy conversion efficiency of a prime mover is tested or simulated by a rack when the prime mover works under different rotating speeds and torques, and the external characteristics of the prime mover are obtained; and testing or simulating the transmission efficiency of the transmission under different gears, rotating speeds and torques by using the bench to obtain the external characteristics of the transmission. Specifically, as shown in fig. 2 and 3, a gear-rotation speed-transmission efficiency map of the transmission under a certain torque condition and a rotation speed-torque-transmission efficiency map under a certain gear condition; as shown in fig. 4, the rotational speed-torque-energy conversion efficiency map of a certain prime mover.
In the specific implementation process, a mapping relation table of prime motor energy conversion efficiency and prime motor rotating speed-torque and a mapping relation table of transmission efficiency and transmission gear-rotating speed-torque are preset in a vehicle control module. Specifically, a possible mapping table of transmission efficiency (%) to rotational speed-torque for the transmission under certain gear conditions is shown in table 1:
s200: constructing a power transmission efficiency evaluation model of the vehicle driving system by using the configured external characteristics of the prime mover and the external characteristics of the transmission; in the specific implementation process, the method comprises the following steps of,
formula (1) of the vehicle drive system power transmission efficiency evaluation model:
wherein the content of the first and second substances,
indicating the power transmission efficiency of the vehicle drive system,
in order to achieve the energy conversion efficiency of the prime mover,
is a transmission
The transmission efficiency of the gear is improved,
representing the energy conversion efficiency of the remaining components of the vehicle drive system.
TABLE 1
In the specific implementation process, the energy conversion efficiency/transmission efficiency value which is not at the working condition point of the mapping relation table can be obtained by an interpolation method.
Specifically, the energy conversion efficiency of the remaining components of the vehicle drive system is typically set at 94%.
S300: and acquiring the required torque and the required vehicle speed of the vehicle.
S400: and calculating the potential gear matching the rotation speed-torque of the prime mover with the transmission by using the vehicle required torque and the required vehicle speed.
S500: and constructing a mathematical programming formula for selecting the gear with the highest power transmission efficiency of the vehicle driving system by using the transmission efficiency evaluation model of the vehicle driving system and the required torque and the required rotating speed of the vehicle as follows:
wherein the content of the first and second substances,
respectively representing the minimum value and the maximum value of the vehicle driving demand speed;
respectively representing the minimum value and the maximum value of the vehicle driving demand torque;
indicating the number of gears in the transmission.
Show the vehicle is
The speed of the vehicle in the gear-down state,
show the vehicle is
Drive torque in gear.
The output rotational speed of the prime mover is indicated,
representing the prime mover output torque.
The radius of the wheel is indicated by the radius of the wheel,
indicates the transmission is
The transmission ratio of the gear to be shifted,
the gear ratio of the other speed reducers such as a main speed reducer, a wheel-side speed reducer and the like is shown.
In particular, one possible potential gear for matching the prime mover speed-torque to the transmission and vehicle driveline transfer efficiency is shown in table 2.
TABLE 2
S600: and selecting the gear with the highest power transmission efficiency of the vehicle driving system.
S700: and sending out the economical gear information of the transmission by taking the highest gear as the economical gear required by the current driving of the transmission.
Example 2
As shown in fig. 5, an economical gear selection device for a transmission according to an embodiment of the present application includes:
the system comprises a configuration module, a model creation module, a second calculation module, an acquisition module, a first calculation module, a comparison module and a recommendation module;
a configuration module for configuring an external characteristic of the prime mover and an external characteristic of the transmission; the external characteristics of the prime motor comprise the rotation speed-torque-energy conversion efficiency characteristics of the prime motor, and the external characteristics of the transmission comprise the gear-rotation speed-torque-transmission efficiency characteristics of the transmission;
the model creating module is used for constructing a power transmission efficiency evaluation model of the vehicle driving system by using the acquired external characteristics of the prime mover and the transmission;
the acquisition module is used for acquiring the driving required torque and the vehicle speed of the vehicle;
the first calculation module is used for calculating potential gears matched with the prime mover speed-torque and the transmission;
the second calculation module is used for calculating the power transmission efficiency of each potential gear by using the power transmission efficiency evaluation model of the vehicle driving system;
the comparison module is used for searching a gear with the highest power transmission efficiency in the calculated power transmission efficiencies of the vehicle driving system under each potential gear;
and the recommending module is used for sending the economical gear information of the transmission by taking the highest gear as the economical gear of the current driving requirement of the transmission.
Example 3
The transmission gear shifting recommendation method provided by the embodiment of the application comprises the following steps:
acquiring transmission economic gear information sent by the transmission economic gear selection method of embodiment 1;
and displaying the obtained economic gear information on a vehicle instrument panel.
Example 4
As shown in fig. 6, the embodiment of the present application provides a transmission gear shift recommendation system, which includes a control module, a display module and the economical gear selection device described in embodiment 2; the transmission economic gear recommendation system acquires economic gear information under the current working condition output by the economic gear selection device through the control module, and is used for displaying a gear with the highest power transmission efficiency of a vehicle driving system on a vehicle instrument panel through the display module.
According to the transmission economical gear selection method, the transmission economical gear selection device and the gear shifting recommendation system, the power transmission efficiency of the vehicle driving system under the potentially-matched gear can be predicted through the power transmission efficiency evaluation model of the vehicle driving system, and the gear enabling the power transmission efficiency of the vehicle driving system to be the highest is provided. Accurate selection of economical gears of the transmission is achieved. Compared with the prior art that only the prime mover is operated in the high-efficiency interval to switch gears of the transmission, the method provided by the invention can realize the global optimization of the power transmission efficiency of the vehicle driving system and further improve the vehicle economy.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one type of logical functional division, and other divisions may be realized in practice, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
Although the present invention has been described in detail in connection with the preferred embodiments with reference to the accompanying drawings, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions should be within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present disclosure and the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method of selecting an economical gear of a transmission comprising the steps of:
configuring external characteristics of a prime motor and external characteristics of a speed changer; the external characteristics of the prime motor comprise the rotation speed-torque-energy conversion efficiency characteristics of the prime motor, and the external characteristics of the transmission comprise the gear-rotation speed-torque-transmission efficiency characteristics of the transmission;
constructing a power transmission efficiency evaluation model of the vehicle driving system by using the configured external characteristics of the prime mover and the external characteristics of the transmission;
collecting the driving demand torque and the vehicle speed of the vehicle;
calculating potential gears matched with the prime mover speed-torque and the transmission;
calculating the power transmission efficiency of each potential gear by using a power transmission efficiency evaluation model of a vehicle driving system;
searching a gear with the highest power transmission efficiency according to a calculation result;
and sending transmission economic gear information by taking the highest gear as an economic gear required by the current driving of the transmission.
2. The transmission economy gear selection method according to claim 1, wherein in the step of constructing the vehicle drive system power transmission efficiency evaluation model using the acquired prime mover out characteristic and the transmission out characteristic, the constructed vehicle drive system power transmission efficiency evaluation model is as shown in formula (1):
wherein, the first and the second end of the pipe are connected with each other,
indicating the power transmission efficiency of the vehicle drive system,
for the energy conversion efficiency of the prime mover,
is a transmission
The efficiency of the transmission of the gears is such that,
representing the energy conversion efficiency of the remaining components of the vehicle drive system.
3. The transmission economy gear selection method of claim 2, wherein the step of calculating the power transfer efficiency for each potential gear using the vehicle drive system power transfer efficiency evaluation model comprises:
presetting a mapping relation table of prime motor energy conversion efficiency and prime motor rotating speed-torque;
presetting a mapping relation table of transmission efficiency of the transmission and gear-rotating speed-torque of the transmission;
selecting corresponding prime motor energy conversion efficiency and transmission efficiency of the transmission by utilizing the mapping relation table according to the running rotating speed and torque of the prime motor and the gear position of the transmission;
and calculating the power transmission efficiency of the vehicle driving system by using the power transmission efficiency evaluation model of the vehicle driving system.
4. The transmission economy gear selection method of claim 3, wherein the step of finding the gear with the highest power transfer efficiency based on the calculation comprises:
selecting a gear with the highest power transmission efficiency of a vehicle driving system according to a formula (2);
wherein the content of the first and second substances,
respectively representing the minimum value and the maximum value of the vehicle driving demand speed;
respectively representing the minimum value and the maximum value of the vehicle driving demand torque;
the number of gears of the transmission is indicated,
show the vehicle is
The speed of the vehicle in the down gear,
show the vehicle is
The driving torque in the lower gear is changed,
the output rotational speed of the prime mover is indicated,
the output torque of the prime mover is indicated,
which is indicative of the radius of the wheel,
the transmission is shown in
The transmission ratio of the gear to be shifted,
indicating main reducers, wheel reducers, or the likeThe transmission ratio of the remaining reduction gear.
5. The economical gear selection device of the transmission is characterized by comprising a configuration module, a model creation module, a second calculation module, an acquisition module, a first calculation module, a comparison module and a recommendation module;
a configuration module for configuring external characteristics of the prime mover and the transmission; the external characteristics of the prime motor comprise the rotation speed-torque-energy conversion efficiency characteristics of the prime motor, and the external characteristics of the transmission comprise the gear-rotation speed-torque-transmission efficiency characteristics of the transmission;
the model creating module is used for constructing a power transmission efficiency evaluation model of the vehicle driving system by using the acquired external characteristics of the prime mover and the transmission;
the acquisition module is used for acquiring the driving demand torque and the vehicle speed of the vehicle;
the first calculation module is used for calculating potential gears matched with the prime mover speed-torque and the transmission;
the second calculation module is used for calculating the power transmission efficiency of each potential gear by using the power transmission efficiency evaluation model of the vehicle driving system;
the comparison module is used for searching a gear with the highest power transmission efficiency in the calculated power transmission efficiencies of the vehicle driving system under each potential gear;
and the recommending module is used for sending the economical gear information of the transmission by taking the highest gear as the economical gear of the current driving requirement of the transmission.
6. The transmission economic gear selection device according to claim 5, wherein the model creation module constructs a vehicle drive system power transmission efficiency evaluation model according to formula (1):
wherein, the first and the second end of the pipe are connected with each other,
indicates the power transmission efficiency of the vehicle drive system,
in order to achieve the energy conversion efficiency of the prime mover,
is a transmission
The efficiency of the transmission of the gears is such that,
representing the energy conversion efficiency of the remaining components of the vehicle drive system.
7. The transmission economy gear selection device of claim 6, wherein the second calculation module comprises a first setting unit, a second setting unit, a selection unit, and a calculation unit;
the first setting unit is used for presetting a mapping relation table of prime motor energy conversion efficiency and prime motor rotating speed-torque;
the second setting unit is used for presetting a mapping relation table of transmission efficiency and transmission gear-rotating speed-torque;
the selection unit is used for selecting corresponding prime motor energy conversion efficiency and transmission efficiency of the transmission by utilizing the mapping relation table according to the running rotating speed and the torque of the prime motor and the gear of the transmission;
and the calculating unit is used for calculating the power transmission efficiency of the vehicle driving system by using the power transmission efficiency evaluation model of the vehicle driving system.
8. The transmission economy shift selection device of claim 7, wherein the comparison module is configured to select the most power efficient shift of the vehicle driveline according to equation (2);
wherein, the first and the second end of the pipe are connected with each other,
respectively representing the minimum value and the maximum value of the vehicle driving demand speed;
respectively representing the minimum value and the maximum value of the vehicle drive request torque,
which indicates the number of gears of the transmission,
indicating that the vehicle is
The speed of the vehicle in the down gear,
show the vehicle is
The driving torque in the lower gear is changed,
the output rotational speed of the prime mover is indicated,
is indicative of the output torque of the prime mover,
the radius of the wheel is indicated by the radius of the wheel,
indicates the transmission is
The transmission ratio of the gear to be shifted,
the gear ratio of the other speed reducing devices such as a main speed reducer, a wheel-side speed reducer and the like is shown.
9. A transmission shift recommendation method comprising the steps of:
acquiring economic gear information of the transmission, wherein the economic gear information is the economic gear information of the transmission, which is sent by the economic gear selection method of the transmission according to any one of claims 1 to 4;
and displaying the acquired economic gear information on a vehicle instrument panel.
10. A transmission gear shift recommendation system is characterized by comprising an economical gear selection device, a control module and a display module;
the control module is respectively in communication connection with the economic gear selection device and the display module;
the economical gear selection device is the transmission economical gear selection device of any one of claims 5-8;
the control module is used for acquiring economic gear information under the current driving requirement output by the economic gear selection device and outputting the acquired economic gear information to the display module;
and the display module is used for displaying the gear with the highest power transmission efficiency of the vehicle driving system on a vehicle instrument panel.
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