CN115031018B - Method, device, processor and tractor for adjusting transmission ratio of gearbox - Google Patents

Method, device, processor and tractor for adjusting transmission ratio of gearbox Download PDF

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Publication number
CN115031018B
CN115031018B CN202210499779.0A CN202210499779A CN115031018B CN 115031018 B CN115031018 B CN 115031018B CN 202210499779 A CN202210499779 A CN 202210499779A CN 115031018 B CN115031018 B CN 115031018B
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China
Prior art keywords
gearbox
value
adjusting
real
gear
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CN202210499779.0A
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CN115031018A (en
Inventor
刘中秀
孙晓鹏
王国栋
胡永慧
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Weichai Power Co Ltd
Weifang Weichai Power Technology Co Ltd
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Priority to CN202210499779.0A priority Critical patent/CN115031018B/en
Publication of CN115031018A publication Critical patent/CN115031018A/en
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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
    • 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
    • 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
    • F16H59/68—Inputs being a function of gearing status
    • 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
    • F16H2059/366—Engine or motor speed
    • 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
    • F16H59/68—Inputs being a function of gearing status
    • F16H2059/6838—Sensing gearing status of hydrostatic transmissions
    • F16H2059/6861—Sensing gearing status of hydrostatic transmissions the pressures, e.g. high, low or differential pressures
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/62—Hybrid vehicles

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)

Abstract

The application provides a method, a device, a processor and a tractor for adjusting the transmission ratio of a gearbox. The method comprises the following steps: acquiring a first difference value between the real-time rotating speed and the target rotating speed of the engine, adjusting the transmission ratio of the gearbox according to the first difference value, and acquiring the pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox; adjusting the running speed of the vehicle when the pressure value of the hydraulic motor is greater than the pressure threshold value; after the running speed of the vehicle is adjusted, and the pressure value of the hydraulic motor is still larger than the pressure threshold value, the gear of the gearbox is adjusted so as to adjust the transmission ratio of the gearbox. In this scheme, adjust the transmission ratio through the rotational speed of engine, still adjust the transmission ratio through the speed of traveling of adjustment vehicle, still adjust the transmission ratio through adjusting the gear, this scheme adjusts the transmission ratio through multiple mode high-efficiently, has improved the efficiency of adjusting the transmission ratio of gearbox, and then can effectively protect the gearbox.

Description

Method, device, processor and tractor for adjusting transmission ratio of gearbox
Technical Field
The present application relates to the field of engines, and more particularly, to a method, apparatus, computer readable storage medium, processor and tractor for adjusting the gear ratio of a transmission.
Background
The tractor generally has engine and gearbox, there are planet carrier in the gearbox, hydraulic pump and hydraulic motor, the electricity is connected between engine and the gearbox, the engine during operation drives the hydraulic pump work, and then the output rotational speed of adjustment hydraulic pump changes the pivot angle of hydraulic pump, the flow of liquid flow direction hydraulic motor will change, the rotational speed of planet carrier will change like this, the tractor often faces complicated changeable operating mode when cultivated land, the engine will output different loads, the rotation ratio of gearbox needs to be changed this moment, increase the output torque of gearbox, in order to keep the continuity of speed of a motor, but, when the transmission ratio of gearbox is great, the pressure of gearbox is great, the gearbox can be damaged this moment, the scheme efficiency of the transmission ratio of present adjustment gearbox is lower, and then can't reach the purpose of effective protection gearbox.
Disclosure of Invention
The application mainly aims to provide a method, a device, a computer readable storage medium, a processor and a tractor for adjusting the transmission ratio of a gearbox, so as to solve the problems that the scheme for adjusting the transmission ratio of the gearbox in the prior art is low in efficiency and cannot effectively protect the gearbox.
To achieve the above object, according to one aspect of the present application, there is provided a method of adjusting a gear ratio of a transmission, comprising: acquiring a first difference value between a real-time rotating speed and a target rotating speed of an engine, adjusting a transmission ratio of a gearbox according to the first difference value, and acquiring a pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, wherein a vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox; adjusting the running speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value; after adjusting the travel speed of the vehicle, and while the pressure value of the hydraulic motor is still greater than the pressure threshold, adjusting a gear of the gearbox to adjust the gear ratio of the gearbox.
Further, obtaining a first difference between the real-time rotation speed and the target rotation speed of the engine, and adjusting the transmission ratio of the gearbox according to the first difference, wherein the method comprises the following steps: determining a real-time transmission ratio change rate according to the first difference value and a preset mapping relation, wherein the preset mapping relation is a mapping relation between the first difference value and the real-time transmission ratio change rate; acquiring an upper limit value of a transmission ratio change rate; and adjusting the transmission ratio of the gearbox according to the magnitude relation between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value.
Further, adjusting the gear ratio of the gearbox according to the magnitude relation between the real-time gear ratio change rate and the gear ratio change rate upper limit value comprises: continuously increasing the real-time gear ratio of the gearbox such that the absolute value of the difference of the real-time gear ratio change rate and the gear ratio change rate upper limit is less than a second difference threshold, wherein the second difference threshold is less than the first difference threshold, in the case that the real-time gear ratio change rate is less than the gear ratio change rate upper limit and the absolute value of the difference of the real-time gear ratio change rate and the gear ratio change rate upper limit is greater than a first difference threshold; continuously reducing the real-time gear ratio of the gearbox such that the real-time gear ratio change rate is less than the gear ratio change rate upper limit value and an absolute value of a difference between the real-time gear ratio change rate and the gear ratio change rate upper limit value is less than the second difference threshold value, in case the real-time gear ratio change rate is greater than or equal to the gear ratio change rate upper limit value.
Further, adjusting the travel speed of the vehicle if the pressure value of the hydraulic motor is greater than a pressure threshold value, comprising: reducing the travel speed of the vehicle if the pressure value of the hydraulic motor is greater than the pressure threshold, adjusting a gear of the transmission to adjust the gear ratio of the transmission if the pressure value of the hydraulic motor is still greater than the pressure threshold after adjusting the travel speed of the vehicle, comprising: acquiring a second difference value between a real-time transmission ratio and a target transmission ratio under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the running speed is regulated; and determining whether to adjust the gear of the gearbox according to the second difference value so as to adjust the real-time transmission ratio of the gearbox.
Further, determining whether to adjust the gear of the gearbox based on the second difference to adjust the real-time gear ratio of the gearbox comprises: when the absolute value of the second difference value is larger than a third difference value threshold value, the current gear of the gearbox is adjusted to be a preset gear, and the planet carrier is driven in a pure hydraulic mode when the current gear of the gearbox is the preset gear; acquiring a real-time torque value and a torque target value of the planet carrier under the condition that the current gear of the gearbox is adjusted to the preset gear; the real-time torque value is continuously adjusted such that an absolute value of a difference of the real-time gear ratio and the target gear ratio is less than a fourth difference threshold, the fourth difference threshold being less than the third difference threshold.
Further, after adjusting the travel speed of the vehicle and while the pressure value of the hydraulic motor is still greater than the pressure threshold, adjusting a gear of the gearbox to adjust the gear ratio of the gearbox, the method further comprises: and controlling the engine and the gearbox to stop working under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the gear of the gearbox is adjusted.
Further, the method further comprises: acquiring the temperature of the gearbox; the gear ratio of the gearbox is reduced if the temperature is greater than or equal to a temperature threshold.
According to another aspect of the present application there is provided an apparatus for adjusting the gear ratio of a gearbox comprising: the device comprises a first adjusting unit, a second adjusting unit and a third adjusting unit, wherein the first adjusting unit is used for acquiring a first difference value between the real-time rotating speed and the target rotating speed of an engine, adjusting the transmission ratio of a gearbox according to the first difference value, and acquiring the pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, wherein a vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox; a second adjustment unit configured to adjust a traveling speed of a vehicle in a case where the pressure value of the hydraulic motor is greater than a pressure threshold value; and a third adjusting unit for adjusting the gear of the gearbox to adjust the transmission ratio of the gearbox after adjusting the running speed of the vehicle and under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value.
According to still another aspect of the present application, there is provided a computer readable storage medium including a stored program, wherein the program when run controls a device in which the computer readable storage medium is located to perform any one of the methods.
According to a further aspect of the present application there is provided a processor for running a program, wherein the program when run performs any one of the methods.
According to another aspect of the application there is provided a tractor comprising an engine, a gearbox and a controller, the controller being electrically connected to the engine and the gearbox respectively, the gearbox comprising a planet carrier, a hydraulic pump and a hydraulic motor, the controller being for performing any of the methods.
By applying the technical scheme of the application, a first difference value between the real-time rotating speed and the target rotating speed of the engine is firstly obtained, the transmission ratio of the gearbox is adjusted according to the first difference value, the pressure value of the hydraulic motor in the gearbox is obtained in real time in the process of adjusting the transmission ratio of the gearbox, then the running speed of the vehicle is adjusted under the condition that the pressure value of the hydraulic motor is larger than the pressure threshold value, and finally the gear of the gearbox is adjusted under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the running speed of the vehicle is adjusted, so as to adjust the transmission ratio of the gearbox. In this scheme, adjust the transmission ratio through the rotational speed of engine, still adjust the transmission ratio through the speed of traveling of adjustment vehicle, still adjust the transmission ratio through adjusting the gear, this scheme adjusts the transmission ratio through multiple mode high-efficiently, has improved the efficiency of adjusting the transmission ratio of gearbox, and then can effectively protect the gearbox.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 illustrates a flow chart of a method of adjusting a gear ratio of a transmission according to an embodiment of the application;
FIG. 2 illustrates a flow chart of another method of adjusting gear ratios of a transmission in accordance with embodiments of the present application;
fig. 3 shows a schematic structural view of a device for adjusting the gear ratio of a gearbox according to an embodiment of the application.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the application herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It will be understood that when an element such as a layer, film, region, or substrate is referred to as being "on" another element, it can be directly on the other element or intervening elements may also be present. Furthermore, in the description and in the claims, when an element is described as being "connected" to another element, the element may be "directly connected" to the other element or "connected" to the other element through a third element.
As described in the background art, the prior art solutions for adjusting the gear ratio of a gearbox are inefficient and cannot effectively protect the gearbox, and in order to solve the above problem, in one embodiment of the present application, a method, an apparatus, a computer readable storage medium, a processor and a tractor for adjusting the gear ratio of a gearbox are provided.
According to an embodiment of the present application, a method of adjusting a gear ratio of a transmission is provided.
FIG. 1 is a flow chart of a method of adjusting a gear ratio of a transmission according to an embodiment of the application. As shown in fig. 1, the method comprises the steps of:
step S101, obtaining a first difference value between a real-time rotating speed and a target rotating speed of an engine, adjusting a transmission ratio of a gearbox according to the first difference value, and obtaining a pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, wherein a vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox;
step S102, adjusting the running speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value;
step S103, after adjusting the running speed of the vehicle, and when the pressure value of the hydraulic motor is still greater than the pressure threshold value, adjusting a gear of the transmission to adjust the gear ratio of the transmission.
In the method, a first difference value between the real-time rotating speed of the engine and the target rotating speed is firstly obtained, the transmission ratio of the gearbox is adjusted according to the first difference value, the pressure value of the hydraulic motor in the gearbox is obtained in real time in the process of adjusting the transmission ratio of the gearbox, then the running speed of the vehicle is adjusted under the condition that the pressure value of the hydraulic motor is larger than a pressure threshold value, and finally the gear of the gearbox is adjusted under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the running speed of the vehicle is adjusted, so that the transmission ratio of the gearbox is adjusted. In this scheme, adjust the transmission ratio through the rotational speed of engine, still adjust the transmission ratio through the speed of traveling of adjustment vehicle, still adjust the transmission ratio through adjusting the gear, this scheme adjusts the transmission ratio through multiple mode high-efficiently, has improved the efficiency of adjusting the transmission ratio of gearbox, and then can effectively protect the gearbox.
It should be noted that the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer executable instructions, and that although a logical order is illustrated in the flowcharts, in some cases the steps illustrated or described may be performed in an order other than that illustrated herein.
Specifically, the resistance of the tractor in the process of tillage is different due to various conditions of soil in the process of tillage, and in order to maintain enough traction force, the stepless speed regulation can be realized by the scheme of the application, and the transmission ratio of the gearbox can be gradually adjusted to realize the purpose of smooth speed regulation, so that the gearbox is effectively protected.
In one embodiment, the transmission may be a hydromechanical continuously variable transmission (HMCVT for short), but the present application is not limited to the hydromechanical continuously variable transmission, and may be applied to other types of transmissions.
In one embodiment of the present application, obtaining a first difference between a real-time rotational speed and a target rotational speed of an engine, and adjusting a transmission ratio of a gearbox according to the first difference includes: determining a real-time transmission ratio change rate according to the first difference value and a preset mapping relation, wherein the preset mapping relation is the mapping relation between the first difference value and the real-time transmission ratio change rate; acquiring an upper limit value of a transmission ratio change rate; and adjusting the transmission ratio of the gearbox according to the magnitude relation between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value. In the embodiment, a first difference value between the real-time rotating speed of the engine and the target rotating speed is calculated, whether the engine is in a state of being low due to load or not can be determined through the first difference value, the real-time transmission ratio change rate of the gearbox is determined, and then the transmission ratio of the gearbox is adjusted according to the magnitude relation between the real-time transmission ratio change rate and the upper limit value of the transmission ratio change rate.
In a specific embodiment, the mapping relationship between the first difference value and the real-time transmission ratio change rate may be:
the first difference is 800, the real-time gear ratio change rate is 0.1,
the first difference is 900, the real-time gear ratio change rate is 0.2,
the first difference is 1000, the real-time gear ratio change rate is 0.3, and the gear ratio change rate upper limit value may be 0.5.
In still another embodiment of the present application, adjusting the gear ratio of the transmission according to the magnitude relation between the real-time gear ratio change rate and the gear ratio change rate upper limit value includes: continuously increasing the real-time gear ratio of the gear box so that the absolute value of the difference between the real-time gear ratio change rate and the gear ratio change rate upper limit value is smaller than a second difference threshold value, wherein the second difference threshold value is smaller than the first difference threshold value, when the absolute value of the difference between the real-time gear ratio change rate and the gear ratio change rate upper limit value is larger than the first difference threshold value; and continuously reducing the real-time gear ratio of the gear box under the condition that the real-time gear ratio change rate is larger than or equal to the gear ratio change rate upper limit value, so that the real-time gear ratio change rate is smaller than the gear ratio change rate upper limit value, and the absolute value of the difference value between the real-time gear ratio change rate and the gear ratio change rate upper limit value is smaller than the second difference value threshold value. In the embodiment, the transmission ratio can be further and efficiently adjusted, so that the traction force of the whole vehicle can be increased or reduced, the efficiency of adjusting the transmission ratio of the gearbox is further improved, and the gearbox can be further and effectively protected.
In still another embodiment of the present application, in the case where the pressure value of the hydraulic motor is greater than a pressure threshold value, adjusting the traveling speed of the vehicle includes: reducing the running speed of the vehicle when the pressure value of the hydraulic motor is greater than the pressure threshold value, and adjusting the gear of the transmission to adjust the gear ratio of the transmission when the pressure value of the hydraulic motor is still greater than the pressure threshold value after adjusting the running speed of the vehicle, comprising: acquiring a second difference between the real-time transmission ratio and the target transmission ratio under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the running speed is regulated; and determining whether to adjust the gear of the gearbox according to the second difference value so as to adjust the real-time transmission ratio of the gearbox. In this embodiment, the transmission ratio of the gearbox can be further adjusted by reducing the driving speed of the vehicle, so that more power of the engine can be ensured for overcoming soil resistance, and the transmission ratio of the gearbox can be further and efficiently adjusted by the second difference between the real-time transmission ratio and the target transmission ratio.
In another embodiment of the present application, determining whether to adjust the gear of the gearbox according to the second difference value to adjust the real-time gear ratio of the gearbox includes: when the absolute value of the second difference value is larger than a third difference value threshold value, the current gear of the gearbox is adjusted to be a preset gear, and when the current gear of the gearbox is the preset gear, the planet carrier is driven in a pure hydraulic mode; acquiring a real-time torque value and a torque target value of the planet carrier under the condition that the current gear of the gearbox is adjusted to the preset gear; the real-time torque value is continuously adjusted such that an absolute value of a difference between the real-time gear ratio and the target gear ratio is less than a fourth difference threshold, the fourth difference threshold being less than the third difference threshold. In this embodiment, the gear ratio of the transmission can be further efficiently adjusted, and if the adjustment of the gear ratio of the transmission is stopped when the absolute value of the difference between the real-time gear ratio and the target gear ratio is less than the fourth difference threshold, the traction force and the resistance are already balanced, and the transmission can be effectively protected.
In a specific embodiment of the present application, after adjusting the running speed of the vehicle and when the pressure value of the hydraulic motor is still greater than the pressure threshold value, adjusting a gear of the gearbox to adjust the gear ratio of the gearbox, the method further includes: and controlling the engine and the gearbox to stop working when the pressure value of the hydraulic motor is still larger than the pressure threshold value after the gear of the gearbox is adjusted. In this embodiment, after the gear ratio of the gearbox is adjusted in various ways, the engine and the gearbox are controlled to stop working under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value, so that the gearbox can be protected more efficiently.
In yet another embodiment of the present application, the method further includes: acquiring the temperature of the gearbox; and reducing the gear ratio of the gearbox when the temperature is greater than or equal to a temperature threshold. In the embodiment, the transmission ratio can be further and efficiently adjusted according to the temperature of the gearbox, the efficiency of adjusting the transmission ratio of the gearbox is improved, and the gearbox can be further effectively protected.
The embodiment of the application also provides another method for adjusting the transmission ratio of the gearbox, as shown in fig. 2, firstly, a program starts to run, a first difference value between the real-time rotating speed of the engine and the target rotating speed is obtained, the real-time transmission ratio change rate is determined according to the first difference value and a preset mapping relation, the preset mapping relation is the mapping relation between the first difference value and the real-time transmission ratio change rate, the transmission ratio change rate upper limit value is obtained, the transmission ratio of the gearbox is adjusted according to the magnitude relation between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value, whether the pressure value of the hydraulic motor is larger than the pressure threshold value is determined, the running speed of the vehicle is reduced under the condition that the pressure value of the hydraulic motor is larger than the pressure threshold value, after the running speed of the vehicle is adjusted, whether the pressure value of the hydraulic motor is still larger than the pressure threshold value is determined, a second difference value between the real-time transmission ratio and the target transmission ratio is determined, under the condition that the absolute value of the second difference value is larger than the third difference value is larger than the threshold value, the current position of the gearbox is adjusted to be the torque of the vehicle is not smaller than the torque threshold value, and the torque of the real-time transmission ratio is adjusted under the condition that the absolute value is smaller than the target value is adjusted.
The embodiment of the application also provides a device for adjusting the transmission ratio of the gearbox, and the device for adjusting the transmission ratio of the gearbox can be used for executing the method for adjusting the transmission ratio of the gearbox. The following describes a device for adjusting the gear ratio of a gearbox according to an embodiment of the present application.
FIG. 3 is a schematic illustration of an apparatus for adjusting gear ratios of a transmission in accordance with an embodiment of the present application. As shown in fig. 3, the apparatus includes:
a first adjusting unit 10, configured to obtain a first difference between a real-time rotational speed of an engine and a target rotational speed, adjust a transmission ratio of a transmission according to the first difference, and obtain a pressure value of a hydraulic motor in the transmission in real time during adjustment of the transmission ratio of the transmission, where a vehicle includes the engine and the transmission, and the engine and the transmission are electrically connected;
a second adjusting unit 20 for adjusting the traveling speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value;
and a third adjusting unit 30 for adjusting the gear of the transmission to adjust the gear ratio of the transmission when the pressure value of the hydraulic motor is still greater than the pressure threshold value after the traveling speed of the vehicle is adjusted.
In the above device, the first adjusting unit obtains a first difference value between the real-time rotation speed and the target rotation speed of the engine, adjusts the transmission ratio of the gearbox according to the first difference value, and obtains the pressure value of the hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, the second adjusting unit adjusts the running speed of the vehicle under the condition that the pressure value of the hydraulic motor is greater than the pressure threshold value, and the third adjusting unit adjusts the gear of the gearbox under the condition that the pressure value of the hydraulic motor is still greater than the pressure threshold value after adjusting the running speed of the vehicle so as to adjust the transmission ratio of the gearbox. In this scheme, adjust the transmission ratio through the rotational speed of engine, still adjust the transmission ratio through the speed of traveling of adjustment vehicle, still adjust the transmission ratio through adjusting the gear, this scheme adjusts the transmission ratio through multiple mode high-efficiently, has improved the efficiency of adjusting the transmission ratio of gearbox, and then can effectively protect the gearbox.
Specifically, the resistance of the tractor in the process of tillage is different due to various conditions of soil in the process of tillage, and in order to maintain enough traction force, the stepless speed regulation can be realized by the scheme of the application, and the transmission ratio of the gearbox can be gradually adjusted to realize the purpose of smooth speed regulation, so that the gearbox is effectively protected.
In one embodiment, the transmission may be a hydromechanical continuously variable transmission (HMCVT for short), but the present application is not limited to the hydromechanical continuously variable transmission, and may be applied to other types of transmissions.
In one embodiment of the present application, the first adjustment unit includes a determining module, a first obtaining module, and a first adjustment module, where the determining module is configured to determine a real-time transmission ratio change rate according to the first difference value and a predetermined mapping relationship, where the predetermined mapping relationship is a mapping relationship between the first difference value and the real-time transmission ratio change rate; the first acquisition module is used for acquiring the upper limit value of the transmission ratio change rate; the first adjusting module is used for adjusting the transmission ratio of the gearbox according to the magnitude relation between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value. In the embodiment, a first difference value between the real-time rotating speed of the engine and the target rotating speed is calculated, whether the engine is in a state of being low due to load or not can be determined through the first difference value, the real-time transmission ratio change rate of the gearbox is determined, and then the transmission ratio of the gearbox is adjusted according to the magnitude relation between the real-time transmission ratio change rate and the upper limit value of the transmission ratio change rate.
In a specific embodiment, the mapping relationship between the first difference value and the real-time transmission ratio change rate may be:
the first difference is 800, the real-time gear ratio change rate is 0.1,
the first difference is 900, the real-time gear ratio change rate is 0.2,
the first difference is 1000, the real-time gear ratio change rate is 0.3, and the gear ratio change rate upper limit value may be 0.5.
In yet another embodiment of the present application, the first adjustment module includes a first adjustment sub-module and a second adjustment sub-module, where the first adjustment sub-module is configured to continuously increase the real-time gear ratio of the transmission case such that an absolute value of a difference between the real-time gear ratio change rate and the gear ratio change rate upper limit is smaller than a second difference threshold, where the second difference threshold is smaller than the first difference threshold, when the real-time gear ratio change rate is smaller than the gear ratio change rate upper limit and the absolute value of the difference between the real-time gear ratio change rate and the gear ratio change rate upper limit is larger than a first difference threshold; the second adjustment submodule is used for continuously reducing the real-time gear ratio of the gearbox under the condition that the real-time gear ratio change rate is larger than or equal to the gear ratio change rate upper limit value so that the real-time gear ratio change rate is smaller than the gear ratio change rate upper limit value and the absolute value of the difference value between the real-time gear ratio change rate and the gear ratio change rate upper limit value is smaller than the second difference value threshold. In the embodiment, the transmission ratio can be further and efficiently adjusted, so that the traction force of the whole vehicle can be increased or reduced, the efficiency of adjusting the transmission ratio of the gearbox is further improved, and the gearbox can be further and effectively protected.
In yet another embodiment of the present application, the second adjusting unit includes a second adjusting module for reducing the traveling speed of the vehicle if the pressure value of the hydraulic motor is greater than the pressure threshold value, and the third adjusting unit includes a second acquiring module for acquiring a second difference between the real-time gear ratio and the target gear ratio if the pressure value of the hydraulic motor is still greater than the pressure threshold value after adjusting the traveling speed; the third adjusting module is used for determining whether to adjust the gear of the gearbox according to the second difference value so as to adjust the real-time transmission ratio of the gearbox. In this embodiment, the transmission ratio of the gearbox can be further adjusted by reducing the driving speed of the vehicle, so that more power of the engine can be ensured for overcoming soil resistance, and the transmission ratio of the gearbox can be further and efficiently adjusted by the second difference between the real-time transmission ratio and the target transmission ratio.
In another embodiment of the present application, the third adjustment module includes a third adjustment sub-module, an obtaining sub-module, and a fourth adjustment sub-module, where the third adjustment sub-module is configured to adjust a current gear of the gearbox to a predetermined gear when an absolute value of the second difference is greater than a third difference threshold, and drive the planet carrier in a purely hydraulic manner when the current gear of the gearbox is the predetermined gear; the acquisition submodule is used for acquiring a real-time torque value and a torque target value of the planet carrier under the condition that the current gear of the gearbox is adjusted to the preset gear; the fourth adjustment sub-module is configured to continuously adjust the real-time torque value such that an absolute value of a difference between the real-time gear ratio and the target gear ratio is less than a fourth difference threshold, the fourth difference threshold being less than the third difference threshold. In this embodiment, the gear ratio of the transmission can be further efficiently adjusted, and if the adjustment of the gear ratio of the transmission is stopped when the absolute value of the difference between the real-time gear ratio and the target gear ratio is less than the fourth difference threshold, the traction force and the resistance are already balanced, and the transmission can be effectively protected.
In a specific embodiment of the present application, the apparatus further includes a control unit configured to control the engine and the transmission to stop operating when the pressure value of the hydraulic motor is still greater than the pressure threshold value after the traveling speed of the vehicle is adjusted and when the pressure value of the hydraulic motor is still greater than the pressure threshold value after the gear ratio of the transmission is adjusted. In this embodiment, after the gear ratio of the gearbox is adjusted in various ways, the engine and the gearbox are controlled to stop working under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value, so that the gearbox can be protected more efficiently.
In yet another embodiment of the present application, the apparatus further includes an acquiring unit and a fourth adjusting unit, the acquiring unit is configured to acquire a temperature of the gearbox; the fourth adjusting unit is used for reducing the transmission ratio of the gearbox when the temperature is greater than or equal to a temperature threshold value. In the embodiment, the transmission ratio can be further and efficiently adjusted according to the temperature of the gearbox, the efficiency of adjusting the transmission ratio of the gearbox is improved, and the gearbox can be further effectively protected.
The device for adjusting the transmission ratio of the gearbox comprises a processor and a memory, wherein the first adjusting unit, the second adjusting unit, the third adjusting unit and the like are stored in the memory as program units, and the processor executes the program units stored in the memory to realize corresponding functions.
The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The inner core can be provided with one or more than one, and the transmission ratio of the gearbox is efficiently adjusted by adjusting the parameters of the inner core, so that the gearbox is effectively protected.
The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The embodiment of the invention provides a computer readable storage medium, which comprises a stored program, wherein the program is used for controlling equipment where the computer readable storage medium is positioned to execute the method for adjusting the transmission ratio of a gearbox.
The embodiment of the invention provides a processor which is used for running a program, wherein the program runs to execute the method for adjusting the transmission ratio of the gearbox.
The embodiment of the application also provides a tractor, which comprises an engine, a gearbox and a controller, wherein the controller is respectively and electrically connected with the engine and the gearbox, the gearbox comprises a planet carrier, a hydraulic pump and a hydraulic motor, and the controller is used for executing any one of the methods.
The tractor comprises any one of the methods, wherein the first difference between the real-time rotating speed and the target rotating speed of the engine is firstly obtained, the transmission ratio of the gearbox is adjusted according to the first difference, the pressure value of the hydraulic motor in the gearbox is obtained in real time in the process of adjusting the transmission ratio of the gearbox, then the running speed of the vehicle is adjusted under the condition that the pressure value of the hydraulic motor is larger than the pressure threshold value, and finally the gear of the gearbox is adjusted under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the running speed of the vehicle is adjusted, so that the transmission ratio of the gearbox is adjusted. In this scheme, adjust the transmission ratio through the rotational speed of engine, still adjust the transmission ratio through the speed of traveling of adjustment vehicle, still adjust the transmission ratio through adjusting the gear, this scheme adjusts the transmission ratio through multiple mode high-efficiently, has improved the efficiency of adjusting the transmission ratio of gearbox, and then can effectively protect the gearbox.
The embodiment of the application provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes at least the following steps when executing the program:
step S101, obtaining a first difference value between a real-time rotating speed and a target rotating speed of an engine, adjusting a transmission ratio of a gearbox according to the first difference value, and obtaining a pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, wherein a vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox;
step S102, adjusting the running speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value;
step S103, after adjusting the running speed of the vehicle, and when the pressure value of the hydraulic motor is still greater than the pressure threshold value, adjusting a gear of the transmission to adjust the gear ratio of the transmission.
The device herein may be a server, PC, PAD, cell phone, etc.
The application also provides a computer program product adapted to perform, when executed on a data processing device, a program initialized with at least the following method steps:
Step S101, obtaining a first difference value between a real-time rotating speed and a target rotating speed of an engine, adjusting a transmission ratio of a gearbox according to the first difference value, and obtaining a pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, wherein a vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox;
step S102, adjusting the running speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value;
step S103, after adjusting the running speed of the vehicle, and when the pressure value of the hydraulic motor is still greater than the pressure threshold value, adjusting a gear of the transmission to adjust the gear ratio of the transmission.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that 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 phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects:
1) The method for adjusting the transmission ratio of the gearbox comprises the steps of firstly obtaining a first difference value between the real-time rotating speed of an engine and the target rotating speed, adjusting the transmission ratio of the gearbox according to the first difference value, obtaining the pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, adjusting the running speed of a vehicle under the condition that the pressure value of the hydraulic motor is larger than a pressure threshold value, and finally adjusting the gear of the gearbox under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the running speed of the vehicle is adjusted so as to adjust the transmission ratio of the gearbox. In this scheme, adjust the transmission ratio through the rotational speed of engine, still adjust the transmission ratio through the speed of traveling of adjustment vehicle, still adjust the transmission ratio through adjusting the gear, this scheme adjusts the transmission ratio through multiple mode high-efficiently, has improved the efficiency of adjusting the transmission ratio of gearbox, and then can effectively protect the gearbox.
2) According to the device for adjusting the transmission ratio of the gearbox, the first adjusting unit obtains the first difference value between the real-time rotating speed of the engine and the target rotating speed, adjusts the transmission ratio of the gearbox according to the first difference value, and obtains the pressure value of the hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, the second adjusting unit adjusts the running speed of the vehicle under the condition that the pressure value of the hydraulic motor is larger than the pressure threshold value, and the third adjusting unit adjusts the gear of the gearbox under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the running speed of the vehicle is adjusted, so as to adjust the transmission ratio of the gearbox. In this scheme, adjust the transmission ratio through the rotational speed of engine, still adjust the transmission ratio through the speed of traveling of adjustment vehicle, still adjust the transmission ratio through adjusting the gear, this scheme adjusts the transmission ratio through multiple mode high-efficiently, has improved the efficiency of adjusting the transmission ratio of gearbox, and then can effectively protect the gearbox.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. A method of adjusting a gear ratio of a transmission, comprising:
acquiring a first difference value between a real-time rotating speed and a target rotating speed of an engine, adjusting a transmission ratio of a gearbox according to the first difference value, and acquiring a pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, wherein a vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox;
adjusting the running speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value;
after adjusting the travel speed of the vehicle, and while the pressure value of the hydraulic motor is still greater than the pressure threshold, adjusting a gear of the gearbox to adjust the gear ratio of the gearbox.
2. The method of claim 1, wherein obtaining a first difference between the real-time rotational speed of the engine and the target rotational speed, and adjusting the gear ratio of the gearbox based on the first difference comprises:
determining a real-time transmission ratio change rate according to the first difference value and a preset mapping relation, wherein the preset mapping relation is a mapping relation between the first difference value and the real-time transmission ratio change rate;
Acquiring an upper limit value of a transmission ratio change rate;
and adjusting the transmission ratio of the gearbox according to the magnitude relation between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value.
3. The method of claim 2, wherein adjusting the gear ratio of the transmission based on the magnitude relationship of the real-time gear ratio change rate and the gear ratio change rate upper limit comprises:
continuously increasing the real-time gear ratio of the gearbox such that the absolute value of the difference of the real-time gear ratio change rate and the gear ratio change rate upper limit is less than a second difference threshold, wherein the second difference threshold is less than the first difference threshold, in the case that the real-time gear ratio change rate is less than the gear ratio change rate upper limit and the absolute value of the difference of the real-time gear ratio change rate and the gear ratio change rate upper limit is greater than a first difference threshold;
continuously reducing the real-time gear ratio of the gearbox such that the real-time gear ratio change rate is less than the gear ratio change rate upper limit value and an absolute value of a difference between the real-time gear ratio change rate and the gear ratio change rate upper limit value is less than the second difference threshold value, in case the real-time gear ratio change rate is greater than or equal to the gear ratio change rate upper limit value.
4. The method of claim 1, wherein the step of determining the position of the substrate comprises,
in the event that the pressure value of the hydraulic motor is greater than a pressure threshold, adjusting a travel speed of a vehicle, comprising:
reducing the travel speed of the vehicle if the pressure value of the hydraulic motor is greater than the pressure threshold, adjusting a gear of the transmission to adjust the gear ratio of the transmission if the pressure value of the hydraulic motor is still greater than the pressure threshold after adjusting the travel speed of the vehicle, comprising:
acquiring a second difference value between a real-time transmission ratio and a target transmission ratio under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the running speed is regulated;
and determining whether to adjust the gear of the gearbox according to the second difference value so as to adjust the real-time transmission ratio of the gearbox.
5. The method of claim 4, wherein determining whether to adjust the gear of the transmission based on the second difference to adjust the real-time gear ratio of the transmission comprises:
when the absolute value of the second difference value is larger than a third difference value threshold value, the current gear of the gearbox is adjusted to be a preset gear, and the planet carrier is driven in a pure hydraulic mode when the current gear of the gearbox is the preset gear;
Acquiring a real-time torque value and a torque target value of the planet carrier under the condition that the current gear of the gearbox is adjusted to the preset gear;
the real-time torque value is continuously adjusted such that an absolute value of a difference of the real-time gear ratio and the target gear ratio is less than a fourth difference threshold, the fourth difference threshold being less than the third difference threshold.
6. The method according to any one of claims 1 to 5, characterized in that after adjusting the running speed of the vehicle and while the pressure value of the hydraulic motor is still greater than the pressure threshold value, the method further comprises, after adjusting the gear of the gearbox to adjust the gear ratio of the gearbox:
and controlling the engine and the gearbox to stop working under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value after the gear of the gearbox is adjusted.
7. The method according to claim 1, wherein the method further comprises:
acquiring the temperature of the gearbox;
the gear ratio of the gearbox is reduced if the temperature is greater than or equal to a temperature threshold.
8. An apparatus for adjusting a gear ratio of a transmission, comprising:
the device comprises a first adjusting unit, a second adjusting unit and a third adjusting unit, wherein the first adjusting unit is used for acquiring a first difference value between the real-time rotating speed and the target rotating speed of an engine, adjusting the transmission ratio of a gearbox according to the first difference value, and acquiring the pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, wherein a vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox;
a second adjustment unit configured to adjust a traveling speed of a vehicle in a case where the pressure value of the hydraulic motor is greater than a pressure threshold value;
and a third adjusting unit for adjusting the gear of the gearbox to adjust the transmission ratio of the gearbox after adjusting the running speed of the vehicle and under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value.
9. A computer readable storage medium, characterized in that the computer readable storage medium comprises a stored program, wherein the program, when run, controls a device in which the computer readable storage medium is located to perform the method of any one of claims 1 to 7.
10. A processor for running a program, wherein the program when run performs the method of any one of claims 1 to 7.
11. A tractor comprising an engine, a gearbox and a controller, the controller being electrically connected to the engine and the gearbox, respectively, the gearbox comprising a planet carrier, a hydraulic pump and a hydraulic motor, the controller being adapted to perform the method of any one of claims 1 to 7.
CN202210499779.0A 2022-05-09 2022-05-09 Method, device, processor and tractor for adjusting transmission ratio of gearbox Active CN115031018B (en)

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