CN111828611B - Gear control method and system for automatic gearbox of loader - Google Patents

Gear control method and system for automatic gearbox of loader Download PDF

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Publication number
CN111828611B
CN111828611B CN202010542331.3A CN202010542331A CN111828611B CN 111828611 B CN111828611 B CN 111828611B CN 202010542331 A CN202010542331 A CN 202010542331A CN 111828611 B CN111828611 B CN 111828611B
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gear
gearbox
preset condition
loader
automatic
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CN111828611A (en
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刘彦辉
张昭东
赵文祥
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Jiangsu XCMG Construction Machinery Institute Co Ltd
Jiangsu Advanced Construction Machinery Innovation Center Ltd
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Jiangsu XCMG Construction Machinery Institute Co Ltd
Jiangsu Advanced Construction Machinery Innovation Center Ltd
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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
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
    • F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
    • F16H2061/0223—Generating of new shift maps, i.e. methods for determining shift points for a schedule by taking into account driveline and vehicle conditions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
    • F16H61/0202—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric
    • F16H61/0204—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal
    • F16H61/0213—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used the signals being electric for gearshift control, e.g. control functions for performing shifting or generation of shift signal characterised by the method for generating shift signals
    • F16H2061/0227—Shift map selection, i.e. methods for controlling selection between different shift maps, e.g. to initiate switch to a map for up-hill driving

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

Abstract

The invention discloses a gear control method and a gear control system for an automatic gearbox of a loader, wherein when the loader climbs a slope in an automatic gear shifting mode of the gearbox and is downshifted, delta n is increased or reduced on a preset upshifting condition between two gears before and after downshifting, so that the upshifting is more difficult after the downshifting; meanwhile, after the gearbox automatically upshifts, the downshift preset condition between the two gears before and after the upshift is increased or decreased by delta m, so that the downshift is more difficult after the upshift. Gear information before and after shifting is recorded, and a gear shifting strategy is adjusted, so that the gear is more stable when the loader climbs, and the problem of repeatedly lifting and lowering the gear is solved.

Description

Gear control method and system for automatic gearbox of loader
Technical Field
The invention belongs to the technical field of engineering machinery, and relates to a gear control method and system for an automatic gearbox of a loader.
Background
The loader is an engineering machine with wide application, and mainly performs material shoveling, loading and transporting operations. When the loader high-speed climbing of keeping off, because complete machine weight leads to the climbing resistance to increase rapidly greatly, the high gear position is not enough to provide great traction force and satisfies the climbing demand, therefore the speed of a motor vehicle descends fastly, and the automatic operation of stepping down is carried out to the gearbox, increases traction force through reducing the fender position. Because the traction force of the low gear is large, the climbing resistance can be completely overcome, the vehicle speed is gradually increased after the gear is down shifted, the gear-up condition is reached, and the gear-up operation is executed by the gearbox. After the upshift, the transmission case is subjected to downshift due to insufficient traction force, so that the transmission case repeatedly performs the upshift operation when climbing a slope. To address this problem, transmission shifting strategies typically provide for increasing the vehicle speed differential between the upshift and downshift points to prevent repeated upshifts. And too big lift car speed difference can cause the speed of downshifting too low, and the speed of upshifting too high, has reduced complete machine driving comfort. Therefore, how to design a proper gear control strategy according to the working condition requirement of the loader when climbing a slope is a difficult problem for intelligent control of the loader.
The prior art schemes fall into two categories. One is that the running state or grade of the ramp is judged so as to determine the running condition of the whole machine, and different gear shifting strategies are corresponding to the working condition. The second type of prior art is to correct the shift point of the whole engine according to the current gear and the driving resistance (or the engine torque).
The prior art has the following defects: although the gear shifting strategy and the gear shifting point correction which are suitable for the design according to the slope, the resistance and the gears are designed in the above technology, the gear shifting strategy design problems under two gear shifting requirements of gear shifting after gear shifting up and gear shifting after gear shifting down in the process of uphill are not solved.
Disclosure of Invention
The purpose is as follows: in order to overcome the defects in the prior art, the invention provides a gear control method and system for an automatic gearbox of a loader, which solve the problem of repeated gear lifting and gear falling under the condition that the loader climbs a slope, reduce the abrasion of a clutch and improve the driving comfort of the whole loader.
The technical scheme is as follows: in order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in a first aspect, a gear control method for an automatic gearbox of a loader is provided, which comprises the following steps:
when the loader is in a climbing working condition and the gear shifting mode switch selects an automatic gear shifting mode, acquiring gear change information of the gearbox;
in response to satisfaction of preset condition N in upshift strategy tableKupThe method comprises the steps of enabling a gearbox to be subjected to gear-up operation, enabling the gearbox to be in a K +1 gear mode through the current gear K, recording gear information of the K gear before gear-up and the K +1 gear after gear-up, and sending an instruction to control a preset condition N for shifting the K +1 gear to the original K gear in a gear-down strategy tableK+1DownIncrease or decrease Δ m, adjust to NK+1Down+ Δ m or NK+1 DownΔ m, making it more difficult to downshift from K +1 to K;
or, responding to the satisfaction of the preset condition N in the gear-down strategy tableKDownThe method comprises the steps that a gear-down operation is carried out on a gearbox, the gearbox is shifted down from a current gear K to a gear K-1, gear information of the gear K before the gear K is shifted down and the gear information of the gear K-1 after the gear K is shifted down are recorded, and an instruction is sent out to control a preset condition N for shifting the gear K-1 to the original gear K in a gear-up strategy tableK-1UpIncrease or decrease Δ N, adjust to NK-1Up+ Δ N or NK-1Up-Δn, making it more difficult to upshift from K-1 gear to K gear.
In some embodiments, in the method for controlling the gear of the automatic gearbox of the loader, if the gear is shifted again after the gear is shifted from K to K +1, the information of the gear before and after the gear is shifted is recorded again as the gear K +1 and the gear K + 2; canceling the adjustment of the delta m from the K +1 to the K gear, and recovering to the preset condition N of the gear-down referenceK+1DownMeanwhile, the original gear-down preset condition N of the gears K +2 to K +1 is set in the gear-down strategy tableK+2DownIncrease or decrease Δ m, adjust to NK+2Down+ Δ m or NK+2Down-Δm。
In some embodiments, according to the gear control method for the automatic gearbox of the loader, if the gear is shifted down again after the gear is shifted down from K to K-1, the information of the gears before and after the gear is shifted down is recorded again as the gear of K-1 and the gear of K-2; canceling delta N adjustment from K-1 to K gear and returning to the preset condition N of gear-up referenceK-1UpMeanwhile, the original gear-up preset conditions N of the gears K-2 to K-1 are set in the gear-up strategy tableK-2UpIncrease or decrease Δ N, adjust to NK-2Up+ Δ N or NK-2Up-Δn。
In some embodiments, the gear control method for the automatic transmission of the loader, the upshift or downshift preset condition is that one or a combination of a transmission speed, a vehicle speed, a transmission torque, an engine speed, an engine torque, a torque converter speed, a torque converter torque, a torque converter gear ratio, a torque converter torque ratio and an accelerator pedal position parameter changes to reach a corresponding preset value.
Wherein, Δ n and Δ m are adjustment values of preset upshifting or downshifting conditions, and can be set according to actual conditions.
In some embodiments, there are 3 downshift preset conditions included in the downshift policy table: 4-gear reduction and 3-gear preset condition N4Down3-gear-down 2-gear preset condition N3Down2-gear-down-1-gear preset condition N2Down。
The upshift strategy table includes 3 upshift preset conditions: 1-gear up and 2-gear preset condition N1Up2-gear up and 3-gear preset condition N2Up3-gear-up and 4-gear preset condition N3Up。
After the gearbox is shifted up, if the current gear is in the highest gear, the gear information recorded in the gearbox control unit is the highest gear and the next highest gear.
And after the gearbox is downshifted, if the current gear is in the lowest gear, the gear information recorded in the gearbox control unit is the lowest gear and the next lowest gear.
As an embodiment of the present invention, the preset condition is that the change of the rotational speed of the transmission reaches a preset lifting value;
as an embodiment of the present invention, the preset condition is that a vehicle speed change reaches a preset upshift value;
as an embodiment of the present invention, the preset condition is that the change in torque of the transmission reaches a preset upshift value;
as an embodiment of the present invention, the preset condition is that the engine speed change reaches a preset up-down value;
as an embodiment of the present invention, the preset condition is that the engine torque variation reaches a rising-falling preset value;
as an embodiment of the present invention, the preset condition is that the change in the gear ratio of the torque converter reaches the lift preset value.
In a second aspect, a gear control system for an automatic gearbox of a loader is provided, which comprises a controller, wherein the controller comprises a memory and a processor, the memory is used for storing instructions, and the instructions are used for controlling the processor to operate so as to execute the gear control method for the automatic gearbox of the loader.
In some embodiments, the memory further stores a shift strategy table including a downshift strategy table and an upshift strategy table.
In some embodiments, the gear control system for an automatic transmission of a loader further comprises: the system comprises a gearbox control unit, a gear shifting mode switch, a vehicle state monitoring module and a gear executing unit; the gear box control unit, the gear shifting mode switch, the vehicle state monitoring module and the gear executing unit are all connected with the controller,
the gearbox control unit is used for acquiring a complete machine operation signal and signals of all sensors mounted on the gearbox, so that the running state of the gearbox is obtained; the gear shifting mode switch is used for selecting a manual gear shifting mode or an automatic gear shifting mode; the vehicle state monitoring module is used for monitoring the information of the rotating speed of an engine, the torque of the engine, the rotating speed of a gearbox and the speed of the vehicle; the gear execution unit comprises an electromagnetic valve capable of controlling gear switching of the gearbox.
In a third aspect, a loader is provided, and the loader automatic gearbox gear control system is included.
Has the advantages that: the invention provides a gear control method and system for an automatic gearbox of a loader, which solve the problem of repeated gear ascending and descending under the condition that the loader climbs a slope. When the loader climbs a slope in the automatic gear shifting mode of the gearbox and is downshifted, delta n is increased or decreased on the preset upshifting condition between two gear positions before and after downshifting, so that the upshifting is more difficult after the downshifting; meanwhile, after the gearbox automatically upshifts, the downshift preset condition between the two gears before and after the upshift is increased or decreased by delta m, so that the downshift is more difficult after the upshift. Gear information before and after shifting is recorded, and a gear shifting strategy is adjusted, so that the gear is more stable when the loader climbs, and the problem of repeatedly lifting and lowering the gear is solved.
Drawings
FIG. 1 is a flow chart of a method for controlling gears of an automatic transmission of a loader according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a gear control system of an automatic transmission of a loader according to an embodiment of the invention;
FIG. 3 is a block diagram of a vehicle condition monitoring module in accordance with an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following examples. The relevant terms are defined as follows:
example 1
As shown in fig. 1, a gear control method for an automatic transmission of a loader comprises the following steps:
when the loader is in a climbing working condition and the gear shifting mode switch selects an automatic gear shifting mode, acquiring gear change information of the gearbox;
in response to satisfaction of preset condition N in upshift strategy tableKupThe gear-shifting operation of the gear-shifting box is carried out, and the gear-shifting box is shifted up from the current gear KThe gear is K +1 gear, gear information of K gear before and K +1 gear after gear upshift is recorded, and a command is sent to control the preset condition N for shifting K +1 gear to original downshift in the downshift strategy tableK+1DownIncrease or decrease Δ m, adjust to NK+1Down+ Δ m or NK+1DownΔ m, making it more difficult to downshift from K +1 to K;
or, responding to the satisfaction of the preset condition N in the gear-down strategy tableKDownThe method comprises the steps that a gear-down operation is carried out on a gearbox, the gearbox is shifted down from a current gear K to a gear K-1, gear information of the gear K before the gear K is shifted down and the gear information of the gear K-1 after the gear K is shifted down are recorded, and an instruction is sent out to control a preset condition N for shifting the gear K-1 to the original gear K in a gear-up strategy tableK-1UpIncrease or decrease Δ N, adjust to NK-1Up+ Δ N or NK-1UpΔ n, making it more difficult to upshift from K-1 gear to K gear.
In some embodiments, in the method for controlling the gear of the automatic gearbox of the loader, if the gear is shifted again after the gear is shifted from K to K +1, the information of the gear before and after the gear is shifted is recorded again as the gear K +1 and the gear K + 2; canceling the adjustment of the delta m from the K +1 to the K gear, and recovering to the preset condition N of the gear-down referenceK+1DownMeanwhile, the original gear-down preset condition N of the gears K +2 to K +1 is set in the gear-down strategy tableK+2DownIncrease or decrease Δ m, adjust to NK+2Down+ Δ m or NK+2Down-Δm。
In some embodiments, according to the gear control method for the automatic gearbox of the loader, if the gear is shifted down again after the gear is shifted down from K to K-1, the information of the gears before and after the gear is shifted down is recorded again as the gear of K-1 and the gear of K-2; canceling delta N adjustment from K-1 to K gear and returning to the preset condition N of gear-up referenceK-1UpMeanwhile, the original gear-up preset conditions N of the gears K-2 to K-1 are set in the gear-up strategy tableK-2UpIncrease or decrease Δ N, adjust to NK-2Up+ Δ N or NK-2Up-Δn。
In some embodiments, the gear control method for the automatic transmission of the loader, the upshift or downshift preset condition is that one or a combination of a transmission speed, a vehicle speed, a transmission torque, an engine speed, an engine torque, a torque converter speed, a torque converter torque, a torque converter gear ratio, a torque converter torque ratio and an accelerator pedal position parameter changes to reach a corresponding preset value.
In some embodiments, there are 3 downshift preset conditions included in the downshift policy table: 4-gear reduction and 3-gear preset condition N4Down3-gear-down 2-gear preset condition N3Down2-gear-down-1-gear preset condition N2Down。
The upshift strategy table includes 3 upshift preset conditions: 1-gear up and 2-gear preset condition N1Up2-gear up and 3-gear preset condition N2Up3-gear-up and 4-gear preset condition N3Up。
Downshift strategy table
1 gear 2 keeps off 3 grade 4-gear
/ N2Down N3Down N4Down
Upshift strategy table
1 gear 2 keeps off 3 grade 4-gear
N1Up N2Up N3Up /
After the gearbox is shifted up, if the current gear is in the highest gear, the gear information recorded in the gearbox control unit is the highest gear and the next highest gear.
And after the gearbox is downshifted, if the current gear is in the lowest gear, the gear information recorded in the gearbox control unit is the lowest gear and the next lowest gear.
As an embodiment of the present invention, the preset condition is that the change of the rotational speed of the transmission reaches a preset lifting value;
as an embodiment of the present invention, the preset condition is that a vehicle speed change reaches a preset upshift value;
as an embodiment of the present invention, the preset condition is that the change in torque of the transmission reaches a preset upshift value;
as an embodiment of the present invention, the preset condition is that the engine speed change reaches a preset up-down value;
as an embodiment of the present invention, the preset condition is that the engine torque variation reaches a rising-falling preset value;
as an embodiment of the present invention, the preset condition is that the change in the gear ratio of the torque converter reaches the lift preset value.
Example 2
As shown in fig. 2, the gear control system for the automatic gearbox of the loader comprises a controller, wherein the controller comprises a memory and a processor, the memory is used for storing instructions, and the instructions are used for controlling the processor to operate so as to execute the gear control method for the automatic gearbox of the loader.
In some embodiments, the memory further stores a shift strategy table including a downshift strategy table and an upshift strategy table.
In some embodiments, the gear control system for an automatic transmission of a loader further comprises: the system comprises a gearbox control unit, a gear shifting mode switch, a vehicle state monitoring module and a gear executing unit; the gear box control unit, the gear shifting mode switch, the vehicle state monitoring module and the gear executing unit are all connected with the controller,
the gearbox control unit is used for acquiring a complete machine operation signal and signals of all sensors mounted on the gearbox, so that the running state of the gearbox is obtained; the gear shifting mode switch is used for selecting a manual gear shifting mode or an automatic gear shifting mode; the vehicle state monitoring module is used for monitoring the information of the engine rotating speed, the engine torque, the gearbox rotating speed and the vehicle speed, and is shown in figure 3; the gear execution unit comprises an electromagnetic valve capable of controlling gear switching of the gearbox.
Example 3
A loader comprises the automatic gearbox gear control system of the loader.
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.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.

Claims (10)

1. A gear control method for an automatic gearbox of a loader is characterized by comprising the following steps:
when the loader is in a climbing working condition and the gear shifting mode switch selects an automatic gear shifting mode, acquiring gear change information of the gearbox;
in response to satisfaction of preset condition N in upshift strategy tableKupThe method comprises the steps of enabling a gearbox to be subjected to gear-up operation, enabling the gearbox to be in a K +1 gear mode through the current gear K, recording gear information of the K gear before gear-up and the K +1 gear after gear-up, and sending an instruction to control a preset condition N for shifting the K +1 gear to the original K gear in a gear-down strategy tableK+1DownIncreasing or decreasing the delta m, wherein the delta m is an adjustment value of the gear-down preset condition; adjusted to NK+1Down+ Δ m or NK+1 DownΔ m, making it more difficult to downshift from K +1 to K;
or, responding to the satisfaction of the preset condition N in the gear-down strategy tableKDownThe method comprises the steps that a gear-down operation is carried out on a gearbox, the gearbox is shifted down from a current gear K to a gear K-1, gear information of the gear K before the gear K is shifted down and the gear information of the gear K-1 after the gear K is shifted down are recorded, and an instruction is sent out to control a preset condition N for shifting the gear K-1 to the original gear K in a gear-up strategy tableK-1UpIncrease or decrease Δ n, Δ n being an increaseShifting an adjustment value of a preset condition; adjusted to NK-1Up+ Δ N or N K-1UpΔ n, making it more difficult to upshift from K-1 gear to K gear.
2. The method for controlling the gear of the automatic gearbox of the loader according to claim 1, wherein if the gear is shifted again after the gear is shifted from K to K +1, the gear information before and after the gear is shifted is recorded again as the gear K +1 and the gear K + 2; canceling the adjustment of the delta m from the K +1 to the K gear, and recovering to the preset condition N of the gear-down referenceK+1DownMeanwhile, the original gear-down preset condition N of the gears K +2 to K +1 is set in the gear-down strategy tableK+2DownIncrease or decrease Δ m, adjust to NK+2Down+ Δ m or NK+2 Down -Δm。
3. The method for controlling the gear of the automatic gearbox of the loader according to claim 1, wherein if the gear down occurs again after the gear down from K to K-1, the gear information before and after the gear down is recorded again as the gear K-1 and the gear K-2; canceling delta N adjustment from K-1 to K gear and returning to the preset condition N of gear-up referenceK-1UpMeanwhile, the original gear-up preset conditions N of the gears K-2 to K-1 are set in the gear-up strategy tableK-2UpIncrease or decrease Δ N, adjust to NK-2Up+ Δ N or N K-2Up-Δn。
4. The method for controlling the gear of the automatic gearbox of the loader according to claim 1,
the preset upshifting or downshifting condition is that the change of one or a combination of a plurality of parameters of the rotating speed of the gearbox, the vehicle speed, the torque of the gearbox, the rotating speed of the engine, the torque of the engine, the rotating speed of the hydraulic torque converter, the torque of the hydraulic torque converter, the gear ratio of the hydraulic torque converter, the torque ratio of the hydraulic torque converter and the position of the accelerator pedal reaches a corresponding preset value.
5. The method of claim 1, wherein the downshift strategy table includes 3 downshift presets: 4-gear reduction and 3-gear preset condition N4Down3-gear-down 2-gear preset condition N3Down2-gear-down-1-gear preset condition N2Down。
6. The method of claim 1, wherein the upshift strategy table includes 3 upshift preset conditions: 1-gear up and 2-gear preset condition N1Up2-gear up and 3-gear preset condition N2Up3-gear-up and 4-gear preset condition N3Up。
7. A gear control system of an automatic gearbox of a loader, which is characterized by comprising a controller, wherein the controller comprises a memory and a processor, the memory is used for storing instructions, and the instructions are used for controlling the processor to operate so as to execute the gear control method of the automatic gearbox of the loader according to any one of claims 1-5.
8. The automatic transmission gear control system of a loader of claim 7, where the memory further stores shift strategy tables including a downshift strategy table and an upshift strategy table.
9. The automatic transmission gear control system of a loader of claim 7, further comprising: the system comprises a gearbox control unit, a gear shifting mode switch, a vehicle state monitoring module and a gear executing unit; the gear box control unit, the gear shifting mode switch, the vehicle state monitoring module and the gear executing unit are all connected with the controller,
the gearbox control unit is used for acquiring a complete machine operation signal and signals of all sensors mounted on the gearbox, so that the running state of the gearbox is obtained; the gear shifting mode switch is used for selecting a manual gear shifting mode or an automatic gear shifting mode; the vehicle state monitoring module is used for monitoring the information of the rotating speed of an engine, the torque of the engine, the rotating speed of a gearbox and the speed of the vehicle; the gear execution unit comprises an electromagnetic valve capable of controlling gear switching of the gearbox.
10. A loader comprising an automatic transmission gear control system of a loader according to any one of claims 7-9.
CN202010542331.3A 2020-06-15 2020-06-15 Gear control method and system for automatic gearbox of loader Active CN111828611B (en)

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