CN115031018A - 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
CN115031018A
CN115031018A CN202210499779.0A CN202210499779A CN115031018A CN 115031018 A CN115031018 A CN 115031018A CN 202210499779 A CN202210499779 A CN 202210499779A CN 115031018 A CN115031018 A CN 115031018A
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China
Prior art keywords
gearbox
value
adjusting
gear
transmission ratio
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Granted
Application number
CN202210499779.0A
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Chinese (zh)
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CN115031018B (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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Publication of CN115031018B publication Critical patent/CN115031018B/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 under the condition that the pressure value of the hydraulic motor is greater than the pressure threshold value; and after the running speed of the vehicle is adjusted, under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value, adjusting the gear of the gearbox so as to adjust the transmission ratio of the gearbox. In this scheme, the gear ratio is adjusted through the rotational speed of engine, still adjusts the gear ratio through the speed of traveling of adjustment vehicle, still adjusts the gear ratio through adjusting the gear, and this scheme comes high-efficiently to adjust the gear ratio through multiple mode, has improved the efficiency of the gear ratio of adjustment 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 in particular, to a method, apparatus, computer readable storage medium, processor and tractor for adjusting a gear ratio of a transmission.
Background
The tractor generally comprises an engine and a gearbox, wherein a planet carrier, a hydraulic pump and a hydraulic motor are arranged in the gearbox, the engine and the gearbox are electrically connected, the hydraulic pump is driven to work when the engine works, further adjusting the output rotating speed of the hydraulic pump, changing the swing angle of the hydraulic pump, the flow rate of the liquid flowing to the hydraulic motor will change, therefore, the rotating speed of the planet carrier can be changed, the tractor can often face complicated and changeable working conditions during tillage, the engine can output different loads, the rotating ratio of the gearbox needs to be changed, the output torque of the gearbox needs to be increased, the continuity of the speed of the tractor can be kept, when the transmission ratio of gearbox is great, the pressure of gearbox is great, and the gearbox can be damaged this moment, and the scheme efficiency of the drive 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 and a device for adjusting the transmission ratio of a gearbox, a computer readable storage medium, a processor and a tractor, so as to solve the problem that the scheme for adjusting the transmission ratio of the gearbox in the prior art is low in efficiency and further 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, including: the method comprises the steps of 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 the vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox; adjusting a travel speed of a vehicle in a case that the pressure value of the hydraulic motor is greater than a pressure threshold value; adjusting a gear of the gearbox to adjust the transmission ratio of the gearbox after adjusting the driving speed of the vehicle and under the condition that the pressure value of the hydraulic motor is still greater than the pressure threshold value.
Further, acquiring a first difference value between the real-time rotating speed and the target rotating speed of the engine, and adjusting the transmission ratio of the gearbox according to the first difference value, wherein the method comprises the following steps: determining a real-time transmission ratio change rate according to the first difference and a preset mapping relation, wherein the preset mapping relation is the mapping relation between the first difference 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 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 comprises: continuously increasing the live gear ratio of the transmission case so that the absolute value of the difference between the live gear ratio change rate and the gear ratio change rate upper limit value is less than a second difference threshold value, wherein the second difference threshold value is less than the first difference threshold value, in the case that the live gear ratio change rate is less than the gear ratio change rate upper limit value and the absolute value of the difference between the live gear ratio change rate and the gear ratio change rate upper limit value is greater than the first difference threshold value; and under the condition that the real-time transmission ratio change rate is greater than or equal to the transmission ratio change rate upper limit value, continuously reducing the real-time transmission ratio of the gearbox, so that the real-time transmission ratio change rate is smaller than the transmission ratio change rate upper limit value, and the absolute value of the difference between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value is smaller than the second difference threshold value.
Further, in the case where the pressure value of the hydraulic motor is greater than a pressure threshold value, adjusting a running speed of a vehicle includes: in a case where the pressure value of the hydraulic motor is greater than the pressure threshold value, reducing the running speed of the vehicle, and in a case where the pressure value of the hydraulic motor is still greater than the pressure threshold value after adjusting the running speed of the vehicle, adjusting a gear of the transmission case to adjust the gear ratio of the transmission case, including: 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 adjusted; 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 according to 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 when the current gear of the gearbox is the preset gear, a pure hydraulic mode is adopted to drive the planet carrier; under the condition that the current gear of the gearbox is adjusted to be the preset gear, acquiring a real-time torque value and a torque target value of the planet carrier; continuously adjusting the live torque value such that an absolute value of a difference between the live 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 running speed of the vehicle and in a case where the pressure value of the hydraulic motor is still greater than the pressure threshold value, adjusting the gear of the transmission case to adjust the transmission ratio of the transmission case, the method further includes: 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; reducing the gear ratio of the gearbox 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 a gear ratio of a transmission, comprising: the system 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 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, and the vehicle comprises the engine and the gearbox which are electrically connected; a second adjustment unit for adjusting a running speed of a vehicle in a case where the pressure value of the hydraulic motor is greater than a pressure threshold value; a third adjusting unit, configured to adjust a gear of the transmission case to adjust the transmission ratio of the transmission case after the running speed of the vehicle is adjusted and the pressure value of the hydraulic motor is still greater than the pressure threshold value.
According to yet another aspect of the application, a computer-readable storage medium is provided, comprising a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform any of the methods.
According to yet another aspect of the application, a processor for running a program is provided, wherein the program performs any one of the methods when running.
According to another aspect of the present 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 arranged to perform any one of the methods described herein.
By applying the technical scheme, the method comprises the steps of firstly obtaining 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, 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, then adjusting the running speed of the 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 running speed of the vehicle is adjusted and the pressure value of the hydraulic motor is still larger than the pressure threshold value so as to adjust the transmission ratio of the gearbox. In this scheme, the speed of revolution through the engine adjusts the drive ratio, still adjusts the drive ratio through the speed of traveling of adjustment vehicle, still adjusts the drive ratio through the adjustment gear, and this scheme adjusts the drive ratio through multiple mode is high-efficient, has improved the efficiency of the drive ratio of adjustment gearbox, and then can effectively protect the gearbox.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 illustrates a flow diagram of a method of adjusting a gear ratio of a transmission according to an embodiment of the present application;
FIG. 2 illustrates a flow diagram of another method of adjusting a gear ratio of a transmission according to an embodiment of the present application;
fig. 3 shows a schematic construction of a device for adjusting the transmission ratio of a gearbox according to an embodiment of the application.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the technical solutions of the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all 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 application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Moreover, 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. Also, in the specification and 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 mentioned in the background, the prior art solutions for adjusting the transmission ratio of a transmission are inefficient and thus fail to achieve effective protection of the transmission, and in order to solve the above problems, in one embodiment of the present application, a method, an apparatus, a computer readable storage medium, a processor and a tractor for adjusting the transmission ratio of a transmission 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 present application. As shown in fig. 1, the method comprises the steps of:
step S101, 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 the vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox;
a step S102 of adjusting a traveling speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value;
step S103 is performed to adjust the gear of the transmission to adjust the transmission ratio of the transmission when the pressure value of the hydraulic motor is still greater than the pressure threshold value after the running speed of the vehicle is adjusted.
In the method, a first difference value between the real-time rotating speed of the engine and the target rotating speed is obtained, the transmission ratio of the gearbox is adjusted according to the first difference value, the pressure value of a 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 running speed of the vehicle is adjusted and the pressure value of the hydraulic motor is still larger than the pressure threshold value, so that the transmission ratio of the gearbox is adjusted. In this scheme, the gear ratio is adjusted through the rotational speed of engine, still adjusts the gear ratio through the speed of traveling of adjustment vehicle, still adjusts the gear ratio through adjusting the gear, and this scheme comes high-efficiently to adjust the gear ratio through multiple mode, has improved the efficiency of the gear ratio of adjustment 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 different than presented herein.
Specifically, the tractor has multiple condition because the soil property is ploughed the in-process, and the resistance that the tractor received in the arable land in-process is also different, in order to keep sufficient traction force, through the above-mentioned scheme of this application, can realize stepless speed governing, adjust the purpose of smooth speed governing in order to realize the transmission ratio of gearbox gradually to effectively protect the gearbox.
In an embodiment, the transmission may be a Hydro-mechanical continuously variable transmission (HMCVT), which is not limited to the above-mentioned HMCVT, and the solution of the present application may also be applied to other types of transmissions.
In an embodiment of the present application, obtaining a first difference between a real-time rotation speed and a target rotation speed of an engine, and adjusting a transmission ratio of a transmission according to the first difference includes: determining a real-time transmission ratio change rate according to the first difference and a predetermined mapping relationship, wherein the predetermined mapping relationship is the mapping relationship between the first difference 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 between the real-time rotating speed of the engine and the target rotating speed is obtained through calculation, whether the engine is in a state that the rotating speed is pressed down due to load can be determined through the first difference, the real-time transmission ratio change rate of the gearbox is determined, and 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 one specific embodiment, the mapping of the first difference to the real-time gear ratio rate of change may be:
the first difference is 800, the real-time gear ratio rate of change is 0.1,
the first difference is 900, the real-time gear ratio rate of change is 0.2,
the first difference is 1000, the real-time gear ratio rate of change is 0.3, and the gear ratio rate of change upper limit may be 0.5.
In another embodiment of the present application, adjusting the transmission ratio of the transmission according to a magnitude relationship between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value includes: continuously increasing the live gear ratio of the transmission case such that the absolute value of the difference between the live 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, when the live gear ratio change rate is less than the gear ratio change rate upper limit and the absolute value of the difference between the live gear ratio change rate and the gear ratio change rate upper limit is greater than the first difference threshold; and continuously reducing the real-time transmission ratio of the gearbox under the condition that the real-time transmission ratio change rate is greater than or equal to the transmission ratio change rate upper limit value, so that the real-time transmission ratio change rate is smaller than the transmission ratio change rate upper limit value, and the absolute value of the difference between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value is smaller than the second difference threshold value. In the embodiment, the transmission ratio can be further 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 effectively protected.
In still another embodiment of the present application, in a case where the pressure value of the hydraulic motor is greater than a pressure threshold value, adjusting a traveling speed of a vehicle includes: the method of controlling a transmission ratio of a transmission includes the steps of, when the pressure value of the hydraulic motor is greater than the pressure threshold value, reducing the traveling speed of the vehicle, and 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, adjusting a gear position of the transmission to adjust the transmission ratio of the transmission, the method including: 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 adjusted; 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 may be further adjusted by reducing the speed of the vehicle, which may ensure that more engine power is used to overcome the soil resistance, and may further efficiently adjust the transmission ratio of the gearbox 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 transmission according to the second difference to adjust the real-time transmission ratio of the transmission 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, a pure hydraulic mode is adopted to drive the planet carrier; under the condition that the current gear of the gearbox is adjusted to the preset gear, acquiring a real-time torque value and a torque target value of the planet carrier; the live torque value is continuously adjusted such that an absolute value of a difference between the live 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 transmission ratio of the transmission can be further efficiently adjusted, and if the absolute value of the difference between the real-time transmission ratio and the target transmission ratio is smaller than the fourth difference threshold, the adjustment of the transmission ratio of the transmission is stopped, and the traction force and the resistance force are balanced, so that the transmission can be effectively protected.
In a specific embodiment of the present application, after adjusting the traveling speed of the vehicle and the pressure value of the hydraulic motor is still greater than the pressure threshold, the method further includes: 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. In the embodiment, after the transmission ratio of the gearbox is adjusted in various modes, 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 another embodiment of the present application, the method further includes: acquiring the temperature of the gearbox; in the event that the temperature is greater than or equal to a temperature threshold, reducing the gear ratio of the transmission. In the embodiment, the transmission ratio can be further 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 effectively protected.
The embodiment of the present application further provides another method for adjusting a transmission ratio of a transmission, as shown in fig. 2, first, a program starts to run, a first difference between a real-time rotation speed of an engine and a target rotation speed is obtained, a real-time transmission ratio change rate is determined according to the first difference and a predetermined mapping relationship, where the predetermined mapping relationship is a mapping relationship between the first difference and the real-time transmission ratio change rate, an upper limit value of the transmission ratio change rate is obtained, a transmission ratio of the transmission is adjusted according to a size relationship between the real-time transmission ratio change rate and the upper limit value of the transmission ratio change rate, whether a pressure value of a hydraulic motor is greater than a pressure threshold value is determined, when the pressure value of the hydraulic motor is greater than the pressure threshold value, the vehicle driving speed is reduced, when the vehicle driving speed is adjusted, whether the pressure value of the hydraulic motor is still greater than the pressure threshold value is determined, when the pressure value of the hydraulic motor is still greater than the pressure threshold value after the vehicle speed is adjusted, and acquiring a second difference value between the real-time transmission ratio and the target transmission ratio, determining whether the second difference value is greater than a third difference threshold value, adjusting the current gear of the gearbox to a preset gear under the condition that the absolute value of the second difference value is greater than the third difference threshold value, acquiring a real-time torque value and a torque target value of the planet carrier, continuously adjusting the real-time torque value to enable the absolute value of the difference value between the real-time transmission ratio and the target transmission ratio to be smaller than a fourth difference threshold value, and ending the operation of the program.
The embodiment of the present application further provides a device for adjusting a transmission ratio of a gearbox, and it should be noted that the device for adjusting a transmission ratio of a gearbox according to the embodiment of the present application may be used to execute the method for adjusting a transmission ratio of a gearbox according to the embodiment of the present application. The following describes an apparatus for adjusting the gear ratio of a transmission according to an embodiment of the present application.
FIG. 3 is a schematic diagram of an apparatus for adjusting the gear ratio of a transmission according to 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 and a target rotational speed of an engine, 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 adjustment unit 20 configured to adjust a traveling speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value;
third adjusting means 30 for adjusting the gear of the transmission to adjust the transmission ratio of the transmission when the pressure value of the hydraulic motor is still greater than the pressure threshold value after the running speed of the vehicle is adjusted.
In the device, a first adjusting unit obtains a first difference value between a real-time rotating speed and a target rotating speed of the engine, adjusts a transmission ratio of the gearbox according to the first difference value, and obtains a pressure value of a hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, a second adjusting unit adjusts a running speed of the vehicle under the condition that the pressure value of the hydraulic motor is larger than a pressure threshold value, and a third adjusting unit adjusts a gear of the gearbox after adjusting the running speed of the vehicle under the condition that the pressure value of the hydraulic motor is still larger than the pressure threshold value so as to adjust the transmission ratio of the gearbox. In this scheme, the gear ratio is adjusted through the rotational speed of engine, still adjusts the gear ratio through the speed of traveling of adjustment vehicle, still adjusts the gear ratio through adjusting the gear, and this scheme comes high-efficiently to adjust the gear ratio through multiple mode, has improved the efficiency of the gear ratio of adjustment gearbox, and then can effectively protect the gearbox.
Specifically, the tractor has multiple condition because the soil property is ploughed the in-process, and the resistance that the tractor received in the arable land in-process is also different, in order to keep sufficient traction force, through the above-mentioned scheme of this application, can realize stepless speed governing, adjust the purpose of smooth speed governing in order to realize the transmission ratio of gearbox gradually to effectively protect the gearbox.
In an embodiment, the transmission may be a Hydro-mechanical continuously variable transmission (HMCVT), which is not limited to the above-mentioned HMCVT, and the solution of the present application may also be applied to other types of transmissions.
In an embodiment of the present application, the first adjusting unit includes a determining module, a first obtaining module, and a first adjusting module, where the determining module is configured to determine a real-time transmission ratio change rate according to the first difference and a predetermined mapping relationship, where the predetermined mapping relationship is a mapping relationship between the first difference and the real-time transmission ratio change rate; the first obtaining module is used for obtaining an upper limit value of the change rate of the transmission ratio; 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 between the real-time rotating speed and the target rotating speed of the engine is obtained through calculation, whether the engine is in a state that the rotating speed is pressed down due to load can be determined through the first difference, the real-time transmission ratio change rate of the gearbox is determined, and the transmission ratio of the gearbox is adjusted according to the size 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 of the first difference to the real-time transmission ratio rate of change may be:
the first difference is 800, the real-time gear ratio rate of change is 0.1,
the first difference is 900, the real-time gear ratio rate of change is 0.2,
the first difference is 1000, the real-time gear ratio rate of change is 0.3, and the gear ratio rate of change upper limit may be 0.5.
In yet another embodiment of the present application, the first adjusting module includes a first adjusting submodule and a second adjusting submodule, the first adjusting submodule is configured to continuously increase the real-time transmission ratio of the transmission case so that an absolute value of a difference between the real-time transmission ratio and the transmission ratio change rate upper limit value is smaller than a second difference threshold value, where the second difference threshold value is smaller than the first difference threshold value, in a case that the real-time transmission ratio change rate is smaller than the transmission ratio change rate upper limit value and the absolute value of the difference between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value is larger than the first difference threshold value; the second adjustment submodule is configured to continuously decrease the live gear ratio of the transmission if the live gear ratio change rate is greater than or equal to the gear ratio change rate ceiling value, such that the live gear ratio change rate is less than the gear ratio change rate ceiling value, and an absolute value of a difference between the live gear ratio change rate and the gear ratio change rate ceiling value is less than the second difference threshold. In the embodiment, the transmission ratio can be further 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 effectively protected.
In still another embodiment of the present application, the second adjusting unit includes a second adjusting module, the second adjusting module is configured to reduce the running speed of the vehicle when the pressure value of the hydraulic motor is greater than the pressure threshold, and the third adjusting unit includes a second obtaining module and a third adjusting module, the second obtaining module is configured to obtain a second difference between the real-time transmission ratio and the target transmission ratio when the pressure value of the hydraulic motor is still greater than the pressure threshold after the running speed is adjusted; and 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 transmission may be further adjusted by reducing the vehicle speed, which may ensure more engine power to overcome the soil resistance, and may further efficiently adjust the transmission ratio of the transmission by the second difference between the real-time transmission ratio and the target transmission ratio.
In another embodiment of the application, the third adjustment module includes a third adjustment submodule, an acquisition submodule, and a fourth adjustment submodule, where the third adjustment submodule is configured to adjust a current gear of the transmission to a predetermined gear when an absolute value of the second difference is greater than a third difference threshold, and drive the carrier in a pure hydraulic manner when the current gear of the transmission is the predetermined gear; the obtaining submodule is used for obtaining 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 be the preset gear; the fourth adjustment submodule is configured to continuously adjust the live torque value such that an absolute value of a difference between the live 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 transmission ratio of the transmission can be further efficiently adjusted, and if the absolute value of the difference between the real-time transmission ratio and the target transmission ratio is smaller than the fourth difference threshold, the adjustment of the transmission ratio of the transmission is stopped, and the traction force and the resistance force are balanced, so that the transmission can be effectively protected.
In a specific embodiment of the present application, the apparatus further includes a control unit, where the control unit is configured to, after adjusting the traveling speed of the vehicle and when the pressure value of the hydraulic motor is still greater than the pressure threshold value, adjust a gear position of the transmission case to adjust the transmission ratio of the transmission case, and when the pressure value of the hydraulic motor is still greater than the pressure threshold value after adjusting the gear position of the transmission case, control the engine and the transmission case to stop operating. In the embodiment, after the transmission ratio of the gearbox is adjusted in various modes, 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 another embodiment of the present application, the apparatus further includes an obtaining unit and a fourth adjusting unit, where the obtaining unit is configured to obtain a temperature of the transmission; the fourth adjusting unit is used for reducing the transmission ratio of the gearbox under the condition that the temperature is greater than or equal to a temperature threshold value. In the embodiment, the transmission ratio can be further 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 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 comprises a kernel, and the kernel calls the corresponding program unit from the memory. The kernel can be set to be one or more than one, and the transmission ratio of the gearbox is efficiently adjusted by adjusting kernel parameters, so that the gearbox is effectively protected.
The memory may include volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), including at least one memory chip.
Embodiments of the present invention provide a computer-readable storage medium, where the computer-readable storage medium includes a stored program, where the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method for adjusting the transmission ratio of a transmission.
Embodiments of the present invention provide a processor, where the processor is configured to execute a program, where the program executes the method for adjusting the transmission ratio of a transmission when running.
The embodiment of the application also provides a tractor, which comprises an engine, a gearbox and a controller, wherein the controller is respectively 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, and the method comprises the steps of firstly obtaining a first difference value between the real-time rotating speed of the engine and the target rotating speed, adjusting the transmission ratio of the gearbox according to the first difference value, obtaining the pressure value of the hydraulic motor in the gearbox in real time in the process of adjusting the transmission ratio of the gearbox, then adjusting the running speed of the vehicle under the condition that the pressure value of the hydraulic motor is greater than a pressure threshold value, and finally adjusting the gear of the gearbox under the condition that the running speed of the vehicle is adjusted and the pressure value of the hydraulic motor is still greater than the pressure threshold value so as to adjust the transmission ratio of the gearbox. In this scheme, the gear ratio is adjusted through the rotational speed of engine, still adjusts the gear ratio through the speed of traveling of adjustment vehicle, still adjusts the gear ratio through adjusting the gear, and this scheme comes high-efficiently to adjust the gear ratio through multiple mode, has improved the efficiency of the gear ratio of adjustment gearbox, and then can effectively protect the gearbox.
The embodiment of the invention provides equipment, which comprises a processor, a memory and a program which is stored on the memory and can run on the processor, wherein when the processor executes the program, at least the following steps are realized:
step S101, 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 the vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox;
a step S102 of adjusting a traveling speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value;
step S103, after the driving speed of the vehicle is adjusted, if the pressure value of the hydraulic motor is still greater than the pressure threshold value, adjusting the gear of the transmission to adjust the transmission ratio of the transmission.
The device herein may be a server, a PC, a PAD, a mobile phone, etc.
The present application further provides a computer program product adapted to perform a program of initializing at least the following method steps when executed on a data processing device:
step S101, 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 the vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox;
a step S102 of adjusting the traveling speed of the vehicle when the pressure value of the hydraulic motor is greater than a pressure threshold value;
step S103 is performed to adjust the gear of the transmission to adjust the transmission ratio of the transmission when the pressure value of the hydraulic motor is still greater than the pressure threshold value after the running speed of the vehicle is adjusted.
As will be appreciated by one skilled in the art, 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 flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams 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 a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The 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 computer storage media 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 that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
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 an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
From the above description, it can be seen that the above-described 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, then 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 running speed of the vehicle is adjusted and the pressure value of the hydraulic motor is still larger than the pressure threshold value so as to adjust the transmission ratio of the gearbox. In this scheme, the gear ratio is adjusted through the rotational speed of engine, still adjusts the gear ratio through the speed of traveling of adjustment vehicle, still adjusts the gear ratio through adjusting the gear, and this scheme comes high-efficiently to adjust the gear ratio through multiple mode, has improved the efficiency of the gear ratio of adjustment gearbox, and then can effectively protect the gearbox.
2) The device for adjusting the transmission ratio of the gearbox comprises a first adjusting unit, a second adjusting unit, a third adjusting unit and a third adjusting unit, wherein the first adjusting unit obtains a first difference value between the real-time rotating speed of an engine and a target rotating speed, the transmission ratio of the gearbox is adjusted according to the first difference value, in the process of adjusting the transmission ratio of the gearbox, the pressure value of a hydraulic motor in the gearbox is obtained in real time, the second adjusting unit adjusts the running speed of a vehicle under the condition that the pressure value of the hydraulic motor is greater than a pressure threshold value, the third adjusting unit adjusts the gear of the gearbox after the running speed of the vehicle is adjusted, and the pressure value of the hydraulic motor is still greater than the pressure threshold value, so that the transmission ratio of the gearbox is adjusted. In this scheme, the gear ratio is adjusted through the rotational speed of engine, still adjusts the gear ratio through the speed of traveling of adjustment vehicle, still adjusts the gear ratio through adjusting the gear, and this scheme comes high-efficiently to adjust the gear ratio through multiple mode, has improved the efficiency of the gear ratio of adjustment gearbox, and then can effectively protect the gearbox.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (11)

1. A method of adjusting a gear ratio of a transmission, comprising:
the method comprises the steps of obtaining 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 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, wherein the vehicle comprises the engine and the gearbox, and the engine is electrically connected with the gearbox;
adjusting a travel speed of a vehicle in a case that the pressure value of the hydraulic motor is greater than a pressure threshold value;
adjusting a gear of the gearbox to adjust the gear ratio of the gearbox after adjusting the travel speed of the vehicle and under a condition that the pressure value of the hydraulic motor is still greater than the pressure threshold value.
2. The method of claim 1, wherein obtaining a first difference between a real-time speed of the engine and a target speed of the engine, and adjusting a gear ratio of the transmission based on the first difference comprises:
determining a real-time transmission ratio change rate according to the first difference and a preset mapping relation, wherein the preset mapping relation is the mapping relation between the first difference 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 between the real-time gear ratio change rate and the gear ratio change rate upper limit value comprises:
in the event that the live rate of change of gear ratio is less than the gear ratio rate of change ceiling value and the absolute value of the difference between the live rate of change of gear ratio and the gear ratio rate of change ceiling value is greater than a first difference threshold, continuously increasing the live rate of gear ratio of the transmission such that the absolute value of the difference between the live rate of change of gear ratio and the gear ratio rate of change ceiling value is less than a second difference threshold, wherein the second difference threshold is less than the first difference threshold;
and under the condition that the real-time transmission ratio change rate is greater than or equal to the transmission ratio change rate upper limit value, continuously reducing the real-time transmission ratio of the gearbox, so that the real-time transmission ratio change rate is smaller than the transmission ratio change rate upper limit value, and the absolute value of the difference between the real-time transmission ratio change rate and the transmission ratio change rate upper limit value is smaller than the second difference threshold value.
4. The method of claim 1,
adjusting a travel speed of a vehicle in a case that the pressure value of the hydraulic motor is greater than a pressure threshold value, including:
in a case where the pressure value of the hydraulic motor is greater than the pressure threshold value, reducing the running speed of the vehicle, and in a case where the pressure value of the hydraulic motor is still greater than the pressure threshold value after adjusting the running speed of the vehicle, adjusting a gear of the transmission case to adjust the gear ratio of the transmission case, including:
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 adjusted;
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 gearbox to adjust the real-time gear ratio of the gearbox based on the second difference comprises:
under the condition that the absolute value of the second difference is larger than a third difference threshold, the current gear of the gearbox is adjusted to be a preset gear, and under the condition that the current gear of the gearbox is the preset gear, a pure hydraulic mode is adopted to drive the planet carrier;
under the condition that the current gear of the gearbox is adjusted to be the preset gear, acquiring a real-time torque value and a torque target value of the planet carrier;
continuously adjusting the live torque value such that an absolute value of a difference between the live 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 in a case where 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 transmission ratio of the gearbox:
and 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, controlling the engine and the gearbox to stop working.
7. The method of claim 1, further comprising:
acquiring the temperature of the gearbox;
reducing the gear ratio of the gearbox if the temperature is greater than or equal to a temperature threshold.
8. An apparatus for adjusting the gear ratio of a transmission, comprising:
the system 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 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, and the vehicle comprises the engine and the gearbox which are electrically connected;
a second adjustment unit for adjusting a running speed of a vehicle in a case where the pressure value of the hydraulic motor is greater than a pressure threshold value;
a third adjusting unit, configured to adjust a gear of the transmission case to adjust the transmission ratio of the transmission case after the running speed of the vehicle is adjusted and the pressure value of the hydraulic motor is still greater than the pressure threshold value.
9. A computer-readable storage medium, comprising a stored program, wherein the program, when executed, controls an apparatus in which the computer-readable storage medium is located to perform the method of any one of claims 1 to 7.
10. A processor, characterized in that the processor is configured to run a program, wherein the program when running performs the method of any 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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