CN112178177A - CVT power transmission system - Google Patents

CVT power transmission system Download PDF

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Publication number
CN112178177A
CN112178177A CN202011235301.4A CN202011235301A CN112178177A CN 112178177 A CN112178177 A CN 112178177A CN 202011235301 A CN202011235301 A CN 202011235301A CN 112178177 A CN112178177 A CN 112178177A
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China
Prior art keywords
module
state
tcu
accelerator pedal
selection module
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Pending
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CN202011235301.4A
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Chinese (zh)
Inventor
陆凤祥
任海勇
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Jiangsu Yueda Intelligent Agricultural Equipment Co ltd
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Jiangsu Yueda Intelligent Agricultural Equipment Co ltd
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Priority to CN202011235301.4A priority Critical patent/CN112178177A/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
    • F16H61/16—Inhibiting or initiating shift during unfavourable conditions, e.g. preventing forward reverse shift at high vehicle speed, preventing engine over 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
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H59/18—Inputs being a function of torque or torque demand dependent on the position of the accelerator pedal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/44—Inputs being a function of speed dependent on machine speed of the machine, e.g. the vehicle
    • 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
    • F16H59/48—Inputs being a function of acceleration

Abstract

The invention provides a CVT power transmission system, which comprises a control unit VCU, a working section position selection module TCU, a brake module BCU and a torque instruction module MCU; the working section position selection module TCU comprises a working state selection module, a driving intention analysis module, a speed ratio adjustment module and a signal conversion output module; the speed ratio adjustment module is configured to adjust vehicle speed based on a first few cyclesV i Calculating a vehicle speed average value, wherein the working state selection module is configured to select a gear ratio adjustment strategy through a gear lever, a hydraulic lever and a load switch; the signal conversion output module is configured to realize signal conversion between the CPU of the TCU and the input conditioning module, the driving module and the communication module; the brake module BCU is configured to determine whether a braking state needs to be entered, said braking module BCU further being configured to output a braking power being a demanded braking power and an engine torque.

Description

CVT power transmission system
Technical Field
The invention relates to the technical field of mechanical control, in particular to a CVT power transmission system.
Background
The tractor hydraulic machinery continuously variable transmission CVT integrates the advantages of hydraulic transmission and mechanical transmission, adopts a double-power flow transmission mode, and is one of the development directions of the tractor technology in the future. The tractor can basically meet the running and gear shifting requirements of a vehicle when the tractor operates on a general farmland, but the speed regulation characteristic requirement of some special working conditions is higher, and the realization is difficult, if the instantaneous PTO needs higher torque, the rotating speed of the engine is easy to reduce, the rotating speed of the PTO is reduced, the farmland operation quality of the tractor is reduced, at the moment, the rotating speed ratio of the tractor can be increased through the speed change mechanism, the output torque of the tractor is improved, and the output characteristic of the PTO is preferentially ensured, so that a new power transmission system is needed.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a CVT power transmission system, aiming at solving the problem of insufficient power of a tractor during instantaneous PTO.
The technical scheme adopted by the invention for solving the technical problems is as follows: a CVT power transmission system comprises a control unit VCU, a working section position selection module TCU, a brake module BCU and a torque instruction module MCU;
the control unit VCU is used for obtaining the current opening value of the accelerator pedalα i Current vehicle speedV i And the current accelerationa i (ii) a The control unit VCU is in communication connection with the working section position selection module TCU;
the working section position selection module TCU comprises a working state selection module, a driving intention analysis module, a speed ratio adjustment module and a signal conversion output module;
the driving intention analysis module is configured to analyze the current accelerator pedal opening valueα i And the current accelerationa i Calculating the state of an accelerator pedal and the state of the whole vehicle; the driving intention analyzing module is also configured to count the times of the accelerator pedal state entering the second state and the times of the whole vehicle state entering the second state and analyze the driving intention;
the speed ratio adjustment module is configured to adjust vehicle speed based on a first few cyclesV i Calculating a mean value of the vehicle speed, wherein the speed ratio adjusting module is also configured to realize speed regulation in a section according to the driving intention and the mean value of the vehicle speed according to a control strategy so as to enable the rotation speed of the engine to be in an ideal working area;
the working state selection module is configured to select a transmission ratio adjustment strategy through a gear lever, a hydraulic lever and a load switch;
the signal conversion output module is configured to realize signal conversion between the CPU of the TCU and the input conditioning module, the driving module and the communication module;
the brake module BCU is configured to determine whether a braking state needs to be entered, the brake module BCU further being configured to output a braking power that is a demanded and an engine torque.
Preferably, the speed ratio adjustment module is further configured to count a number of times the accelerator pedal state enters the first state after entering the flexible shift state;
the driving intent resolution module is further configured to determine whether to maintain the flexible shift state based on a number of times the accelerator pedal state enters the first state and a third count threshold.
Preferably, the electronic control unit VCU is further configured to receive a brake pedal signal Bra of a brake pedal sensor;
the working section position selection module TCU is also required to calculate the required torque before executing a gear shifting strategy, and the working section position selection module TCU is used for calculating the required torque through the following formula:
Figure 327114DEST_PATH_IMAGE002
；
in the formula (I), the compound is shown in the specification,
acc is an accelerator pedal signal;
bra is a brake pedal signal;
ks is a gear signal;
vc is a vehicle speed signal;
ve is the engine speed.
Preferably, the working section bit selection module TCU further includes a system self-checking module and a fault diagnosis module;
the system self-checking module is configured to perform fault checking and fault judgment on hardware;
the fault diagnosis module is configured to communicate with an upper computer or a diagnostic apparatus through a CAN bus, and is further configured to update programs, calibrate parameters, and read TCU operation records, faults and alarm codes.
The invention has the advantages that the TCU enters the delay gear shifting when the tractor works and runs under the complex working condition, and the TCU can judge and needs to enter the normal gear shifting control strategy when the tractor enters the good road condition through the complex road condition, so that the tractor can have sufficient power under various working conditions.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic system diagram of a CVT power transmission system of the present invention.
Fig. 2 is a flowchart of a method of integrated gear control for a CVT power transmission system of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the present invention.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1, the present invention provides a CVT power transmission system comprising a control unit VCU, a working range selection module TCU, a brake module BCU, a torque command module MCU and an engine controller ECU.
And the electric control unit VCU is used for receiving a vehicle speed signal Vc of a vehicle speed sensor, an accelerator pedal signal Acc of an accelerator pedal position sensor and a brake pedal signal Bra of a brake pedal sensor.
The working section position selection module TCU comprises a working state selection module, a driving intention analysis module, a speed ratio adjustment module, a signal conversion output module, a system self-checking module and a fault diagnosis module.
The driving intention analyzing module is configured to calculate a current accelerator pedal opening value according to the vehicle speed signal and the signal of the accelerator pedal position sensorα i Current vehicle speedV i And the current accelerationa i . The driving intention analysis module is also configured to analyze the current accelerator pedal opening valueα i And the current accelerationa i And calculating the state of an accelerator pedal and the state of the whole vehicle. The driving intention analyzing module is further configured to count the number of times that the accelerator pedal state enters the second state and the number of times that the vehicle state enters the second state and analyze the driving intention.
The speed ratio adjustment module is configured to adjust vehicle speed based on the first few cyclesV i And calculating the average value of the vehicle speed, and enabling the speed ratio adjusting module to realize speed regulation in sections according to the driving intention and the average value of the vehicle speed according to a control strategy so as to enable the rotation speed of the engine to be in an ideal working area.
The operating state selection module is configured to select a gear ratio adjustment strategy through a gear lever, a hydraulic lever and a load switch.
The signal conversion output module is configured to realize signal conversion between the CPU of the TCU and the input conditioning module, the driving module and the communication module.
In this embodiment, the speed ratio adjustment module is further configured to count a number of times the accelerator pedal state enters the first state after entering the soft shift state. The driving intent resolution module is further configured to determine whether to maintain the flexible shift state based on a number of times the accelerator pedal state enters the first state and a third count threshold.
In this embodiment, the TCU needs to calculate the required torque before executing the shift strategy, and the TCU is further configured to calculate the required torque according to the following formula:
Figure DEST_PATH_IMAGE003
；
in the formula (I), the compound is shown in the specification,
acc is an accelerator pedal signal;
bra is a brake pedal signal;
ks is a gear signal;
vc is a vehicle speed signal;
ve is the engine speed.
The working section position selection module TCU is also used for combining the required torque and the torque reduction curve to obtain a preset value.
The system self-checking module is configured to perform fault checking and fault judging on the hardware.
The fault diagnosis module is configured to communicate with an upper computer or a diagnostic apparatus through a CAN bus, and is further configured to update programs, calibrate parameters and read TCU operation records, faults and alarm codes.
The brake module BCU is configured to determine whether a braking state needs to be entered, and the brake module BCU is further configured to output a braking power that is an engine torque and a demand.
The engine controller ECU controls the opening of an engine throttle valve through an electronic control unit according to the working condition requirements of the tractor, so that the torque and the rotating speed of the engine are controlled, and the running and operating requirements of the tractor are met.
Based on the CVT power transmission system, as shown in fig. 2, the invention also discloses a gear integrated control method of the CVT power transmission system, which comprises the following steps:
s1, sampling and calculating the opening value of the accelerator pedal, the acceleration and the vehicle speed to obtain the current opening value of the accelerator pedalα i Current vehicle speedV i And the current accelerationa i (ii) a In the present embodiment, the sampling time of the accelerator opening/closing value is Δ t1, the sampling time of the output shaft rotation speed is Δ t2, the current accelerator opening value α i, and the current vehicle speed V i And the current accelerationa i The calculation is made by the following formula:
Figure 713096DEST_PATH_IMAGE005
；
Figure 492833DEST_PATH_IMAGE007
；
Figure 481518DEST_PATH_IMAGE009
；
in the formula:
n 1the sampling times of the accelerator pedal are obtained;
α ij the opening and closing degree value of the accelerator pedal is sampled every time;
n 2the number of sampling times is the rotation speed of the output shaft;
ω ij the rotating speed of the output shaft is sampled every time;
s2, according to the current accelerator pedal opening valueα i Calculating the state of an accelerator pedal, and counting the times of entering the second state of the accelerator pedal according to a first strategy;
according to the current accelerationa i Calculating the state of the whole vehicle, and counting the times of the state of the whole vehicle entering the second state according to a second strategy;
in this embodiment, the first policy is: getp αi Is the ratio of the current accelerator pedal opening value to the previous accelerator pedal opening valuep αi Is less thanσ 1And is greater thanσ 2When the accelerator pedal state is marked as a first state, otherwise, the accelerator pedal state is marked as a second state; when the state of the accelerator pedal is a first state, the counter 1 is unchanged; when the state of the accelerator pedal is a second state, the counter 1 counts and adds 1;
the second strategy is: when in usea i Is less thanσ 3And is greater thanσ 4When the vehicle is in the first state, marking the vehicle state as the first state; otherwise, marking the state of the whole vehicle as a second state; when the state of the whole vehicle is in a first state, the counter 2 is unchanged; when the state of the whole vehicle is in a second state, the counter 2 counts and adds 1;
s3, judging whether to enter the flexible gear shifting state or not according to the frequency of the accelerator pedal state entering the second state and the frequency of the whole vehicle state entering the second state;
when the number of times that the accelerator pedal state does not enter the first state is greater than a first counting threshold value and the number of times that the whole vehicle state does not enter the second state is greater than a second counting threshold value, entering a flexible gear shifting state and entering a step S4;
otherwise, go to step S1;
s4, vehicle speed according to the first few cyclesV i And calculating a vehicle speed average value, comparing the vehicle speed average value with a vehicle speed threshold value, entering a control strategy of delaying downshift if the vehicle speed average value is greater than the vehicle speed threshold value, and entering a control strategy of delaying upshift if the vehicle speed is lower than the vehicle speed threshold value.
And S5, after the flexible gear shifting state is entered, counting the number of times of the accelerator pedal state entering the first state according to a third strategy, if the number of times of the accelerator pedal state entering the first state is larger than a third counting threshold value, exiting the flexible gear shifting state, otherwise, continuously keeping the flexible gear shifting state, and repeating the step S5.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic representation of the term does not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims (4)

1. A CVT power transmission system is characterized by comprising a control unit VCU, a working range position selection module TCU, a brake module BCU and a torque instruction module MCU;
the control unit VCU is used for obtaining the current opening value of the accelerator pedalα i Current vehicle speedV i And the current accelerationa i (ii) a The control unit VCU is in communication connection with the working section position selection module TCU;
the working section position selection module TCU comprises a working state selection module, a driving intention analysis module, a speed ratio adjustment module and a signal conversion output module;
the driving intention analysis module is configured to analyze the current accelerator pedal opening valueα i And the current accelerationa i Calculating the state of an accelerator pedal and the state of the whole vehicle; the driving intent parsing module is further configured to countThe times of the accelerator pedal state entering the second state and the times of the whole vehicle state entering the second state are analyzed, and the driving intention is analyzed;
the speed ratio adjustment module is configured to adjust vehicle speed based on a first few cyclesV i Calculating a mean value of the vehicle speed, wherein the speed ratio adjusting module is also configured to realize speed regulation in a section according to the driving intention and the mean value of the vehicle speed according to a control strategy so as to enable the rotation speed of the engine to be in an ideal working area;
the working state selection module is configured to select a transmission ratio adjustment strategy through a gear lever, a hydraulic lever and a load switch;
the signal conversion output module is configured to realize signal conversion between the CPU of the TCU and the input conditioning module, the driving module and the communication module;
the brake module BCU is configured to determine whether a braking state needs to be entered, the brake module BCU further being configured to output a braking power that is a demanded and an engine torque.
2. A CVT drivetrain as recited in claim 1, wherein:
the speed ratio adjustment module is further configured to count a number of times an accelerator pedal state enters a first state after entering a flexible shift state;
the driving intent resolution module is further configured to determine whether to maintain the flexible shift state based on a number of times the accelerator pedal state enters the first state and a third count threshold.
3. A CVT drivetrain as recited in claim 1, wherein:
the electric control unit VCU is also used for receiving a brake pedal signal Bra of a brake pedal sensor;
the working section position selection module TCU is also required to calculate the required torque before executing a gear shifting strategy, and the working section position selection module TCU is used for calculating the required torque through the following formula:
Figure 307609DEST_PATH_IMAGE002
；
in the formula (I), the compound is shown in the specification,
acc is an accelerator pedal signal;
bra is a brake pedal signal;
ks is a gear signal;
vc is a vehicle speed signal;
ve is the engine speed.
4. A CVT drivetrain as recited in claim 1, wherein:
the working section bit selection module TCU also comprises a working section bit selection module TCU;
the system self-checking module is configured to perform fault checking and fault judgment on hardware;
the fault diagnosis module is configured to communicate with an upper computer or a diagnostic apparatus through a CAN bus, and is further configured to update programs, calibrate parameters, and read TCU operation records, faults and alarm codes.
CN202011235301.4A 2020-11-09 2020-11-09 CVT power transmission system Pending CN112178177A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101046248A (en) * 2006-03-07 2007-10-03 日产自动车株式会社 Control device of vehicle power driving system
CN104691537A (en) * 2015-02-04 2015-06-10 唐海滨 Mechanical automatic transmission control module of pure electric vehicle and gearshift control method
CN106114492A (en) * 2016-06-28 2016-11-16 泰州市海博汽车科技有限公司 New-energy automobile automatic transmission power gear-shifting control system and control method
CN108458098A (en) * 2018-01-31 2018-08-28 北京新能源汽车股份有限公司 A kind of automobile gear shift control method, device, controller and automobile
CN109733402A (en) * 2018-12-26 2019-05-10 江苏大学 The gear complex control system and its control method of the integrated power drive system of electric car

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101046248A (en) * 2006-03-07 2007-10-03 日产自动车株式会社 Control device of vehicle power driving system
CN104691537A (en) * 2015-02-04 2015-06-10 唐海滨 Mechanical automatic transmission control module of pure electric vehicle and gearshift control method
CN106114492A (en) * 2016-06-28 2016-11-16 泰州市海博汽车科技有限公司 New-energy automobile automatic transmission power gear-shifting control system and control method
CN108458098A (en) * 2018-01-31 2018-08-28 北京新能源汽车股份有限公司 A kind of automobile gear shift control method, device, controller and automobile
CN109733402A (en) * 2018-12-26 2019-05-10 江苏大学 The gear complex control system and its control method of the integrated power drive system of electric car

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Application publication date: 20210105