阅读说明：本技术 一种轻卡amt自动变速器起步档位选择及控制方法 (starting gear selection and control method for light truck AMT (automated mechanical Transmission) ) 是由 吴国宽 杜岩 乔丹 张宏健 宋宁 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种AMT自动变速器起步挡位选择控制系统和控制方法,简单来讲就是给轻型卡车的amt自动变速箱提供了两种起步模式,同时控制单元能够根据预设温度条件自动判断起步模式是否选择正确,通过智能降档策略,避免2档离合器滥用、离合器过热、2档起步动力不足等问题,更安全可靠。(The invention discloses a starting gear selection control system and a starting gear selection control method for an AMT (automated mechanical transmission), which are used for providing two starting modes for an AMT automatic gearbox of a light truck, and meanwhile, a control unit can automatically judge whether the starting mode is correctly selected according to a preset temperature condition, so that the problems of abuse of a 2-gear clutch, overheating of the clutch, insufficient 2-gear starting power and the like are avoided through an intelligent downshift strategy, and the system is safer and more reliable.)

1. The utility model provides a starting gear selection control system of AMT automatic gearbox which characterized in that: the automatic transmission mainly comprises an electronic manipulator, an AMT (automated mechanical transmission), a TCU (transmission control unit), an instrument and a wire harness;

The electronic manipulator is used for shifting the gear by a user to operate the electronic mechanism and transmitting a driving requirement to the TCU control unit according to the selection of the driver gear;

The AMT automatic transmission comprises a transmission body, a gear selecting and shifting power unit and an actuating mechanism;

the TCU control unit is a control module of the AMT, performs gear selection and shifting and clutch control according to an instruction of the electronic gear shifter, meets driving requirements and performs safety protection on a driver;

the instrument carries out gear display, buzzing, character screen flipping and other human-computer interface communication according to the requirements of the TCU control unit;

Wiring harness: the electronic manipulator, the AMT automatic transmission, the TCU control unit and the instrument are connected and used for conducting electricity and transmitting signals.

2. the automated manual transmission starting gear selection control system according to claim 1, characterized in that: and the electronic manipulator E2 mode switch is integrated on the electronic manipulator, and the electronic manipulator E2 mode switch is integrated with the economic mode function switch and selectively triggered by a user according to needs.

3. A starting gear selection control method for an AMT automatic transmission is characterized by comprising the following steps: the TCU control unit sets a starting temperature rise threshold value at 2 gears of different rotating speeds according to the clutch temperature rise calculation data;

When a driver starts the gear 1, the driver presses an E2 mode switch of the electronic manipulator to activate the 2-gear starting function, the electronic manipulator sends gear information to a TCU (control communication unit), and the TCU receives a gear high and low level or CAN (controller area network) information message and judges whether the 2-gear starting is selected or not by combining with clutch temperature rise data;

When the temperature rise of the clutch exceeds the corresponding threshold value under 2 gears of different rotating speeds, the safety protection of 1 gear reduction is intelligently carried out.

4. the starting gear selection control method for the AMT automatic transmission according to claim 3, characterized in that: the temperature rise calculation of the clutch is specifically as follows: calculating to obtain the clutch sliding friction work based on the clutch sliding friction torque, the clutch sliding friction rotating speed and the time integral during starting; the clutch sliding friction work is divided by the specific heat of the clutch pressure plate and the mass of the clutch pressure plate to obtain the clutch starting temperature rise each time.

5. The starting gear selection control method for the AMT automatic transmission according to claim 3, characterized in that: the 2-gear starting temperature rise threshold is set differently under different engine rotating speeds, and when the load is less than 30% and the load is negative or the ramp is less than 12% or the rotating speed is less than 3000rpm, the 2-gear starting is carried out, and the maximum starting temperature rise requirement is not more than 10 ℃; when the load is more than 30 percent, the load is more than 12 percent, or the rotating speed is more than 3000rpm, the load is low, the 2-gear is started, the temperature rise is more than 10 ℃, and then the alarm or the intelligent downshift is carried out.

6. the starting gear selection control method for the AMT automatic transmission according to claim 3, characterized in that: the intelligent 1 gear reduction safety protection specifically comprises: the instrument warning strategy is as follows: prompting a driver to select a proper strategy through character flicker and buzzer prompt tone;

intelligent shift mode switching strategy: the instrument warns for a plurality of times, and if the driver does not respond, the TCU control unit automatically returns to the default 1-gear starting execution.

the technical field is as follows:

the invention belongs to the field of design of an AMT (automated mechanical transmission) of a light truck, and particularly relates to a starting gear selection and control system of the AMT of the light truck and a control method of the system.

background art:

The light truck automatic gear AMT is in a starting stage at present, and the starting gear selection and control method for the light truck AMT belongs to a brand new subject. The light truck transmission and the power matching thereof are different from those of a passenger vehicle, the speed of 1 gear and 2 gear of the light truck transmission is larger, the 1 gear and 2 gear can be started, and the 1 gear can meet all working conditions though the 1 gear is started; however, for no-load and partial load, due to the requirements of quick speed increase, economic clearance and gear shifting comfort, the 2-gear starting under the working condition has great practical use requirements, and according to the use survey of users, the ratio of the no-load and light-load 2-gear starting requirements is up to 70%. This requires that the starting gear selection of the light truck automatic gear can simultaneously meet the optional use requirement of the above 1-gear or 2-gear starting.

AMT is the same as MT, and if the operator does not select proper starting gear, using 2-gear for starting under full load and climbing will result in clutch overheating, reduced clutch wear life, and reduced vehicle power.

at present, light truck AMT vehicles are available in foreign markets, but a hydraulic torque converter is adopted to replace a clutch, so that the problems of clutch overheating and clutch abrasion service life reduction do not exist during 2-gear starting gear selection, but technical resources, cost and the like exist in the light truck hydraulic torque converter technology, and the light truck AMT using the traditional clutch is still the mainstream and is still the main choice.

Different from MT, the starting gear selection and control strategy of the AMT automatic transmission can be more intelligent, namely, abuse of 2 gears during starting can be avoided through the starting gear selection and control method, and the problems of clutch overheating, clutch abrasion service life reduction and vehicle power reduction caused by improper use of the 2 gears are solved.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.

the invention content is as follows:

the invention aims to provide a starting gear selecting and controlling system of a light truck AMT (automated mechanical transmission), so that the defects in the prior art are overcome.

In order to achieve the aim, the invention provides a starting gear selection control system of an AMT (automated mechanical transmission), which mainly comprises an electronic manipulator, an AMT, a TCU (transmission control unit), an instrument and a wire harness;

the electronic manipulator is used for shifting the gear by a user to operate the electronic mechanism and transmitting a driving requirement to the TCU control unit according to the selection of the driver gear;

the AMT automatic transmission comprises a transmission body, a gear selecting and shifting power unit and an actuating mechanism;

The TCU control unit is a control module of the AMT, performs gear selection and shifting and clutch control according to an instruction of the electronic gear shifter, meets driving requirements and performs safety protection on a driver;

The instrument carries out gear display, buzzing, character screen flipping and other human-computer interface communication according to the requirements of the TCU control unit;

Wiring harness: the electronic manipulator, the AMT automatic transmission, the TCU control unit and the instrument are connected and used for conducting electricity and transmitting signals.

Preferably, in the above technical solution, the electronic manipulator further comprises an electronic manipulator E2 mode switch integrally distributed on the electronic manipulator, and the electronic manipulator E2 mode switch is integrated with the economy mode function switch and selectively triggered by a user according to needs.

A starting gear selection control method for an AMT automatic transmission comprises the steps that a TCU control unit sets starting temperature rise threshold values at different rotating speeds of 2 gears according to temperature rise calculation data of a clutch;

when a driver starts the gear 1, the driver presses an E2 mode switch of the electronic manipulator to activate the 2-gear starting function, the electronic manipulator sends gear information to a TCU (control communication unit), and the TCU receives a gear high and low level or CAN (controller area network) information message and judges whether the 2-gear starting is selected or not by combining with clutch temperature rise data;

when the temperature rise of the clutch exceeds the corresponding threshold value under 2 gears of different rotating speeds, the safety protection of 1 gear reduction is intelligently carried out.

The system defaults to set 1-gear starting;

when a driver starts the gear 1, the driver presses an E2 mode switch of the electronic manipulator to activate the 2-gear starting function, the electronic manipulator sends gear information to a TCU (control communication unit), and the TCU receives a gear high and low level or CAN (controller area network) information message and judges whether the 2-gear starting is selected or not by combining with clutch temperature rise data;

when the temperature rise of the clutch exceeds the corresponding threshold value under 2 gears of different rotating speeds, the safety protection of 1 gear reduction is intelligently carried out.

Preferably, in the above technical solution, the calculation of the clutch temperature rise specifically includes: calculating to obtain the clutch sliding friction work based on the clutch sliding friction torque, the clutch sliding friction rotating speed and the time integral during starting; the clutch sliding friction work is divided by the specific heat of the clutch pressure plate and the mass of the clutch pressure plate to obtain the clutch starting temperature rise each time.

preferably, in the above technical scheme, the 2-gear starting temperature rise threshold is set differently at different engine speeds, and when the load is less than 30% negative or the ramp is less than 12% or the speed is less than 3000rpm, the 2-gear starting is performed with the maximum starting temperature rise requirement not greater than 10 ℃; when the load is more than 30 percent, the load is more than 12 percent, or the rotating speed is more than 3000rpm, the load is low, the 2-gear is started, the temperature rise is more than 10 ℃, and then the alarm or the intelligent downshift is carried out.

Preferably, in the above technical solution, the intelligently performing the safety protection of gear 1 down specifically includes: the instrument warning strategy is as follows: prompting a driver to select a proper strategy through character flicker and buzzer prompt tone;

Intelligent shift mode switching strategy: the instrument warns for a plurality of times, and if the driver does not respond, the TCU control unit automatically returns to the default 1-gear starting execution.

compared with the prior art, the invention has the following beneficial effects:

Compared with an AMT automatic gear of a passenger vehicle, the automatic gear shifting device has the advantages that the 2-gear starting gear module is added and integrated with the economic mode E, and the automatic gear shifting device has the following obvious advantages:

a) when the light truck is used in no-load and light load (more than 30 percent), the fuel economy under the working conditions of no-load and light load of the AMT of the light truck can be greatly improved;

b) when the light truck is used in no-load and light load (more than 30 percent), the starting acceleration time can be obviously prolonged by 5s or even higher, and the time is saved;

c) when the light truck is used in no-load and light load (more than 30 percent of the ratio), the N-1 gear shifting frequency can be reduced by 30 percent;

d) When the light truck is used in no-load and light load (more than 30 percent), the driving comfort can be improved because no N-1 operation is carried out;

e) through the instrument strategy, man-machine communication is enhanced, the intelligent automobile is more intelligent, and the intelligent automobile development trend requirement is met;

f) through the intelligent downshift strategy, the problems of abuse of a 2-gear clutch, overheating of the clutch, insufficient 2-gear starting power and the like are avoided, and the method is safer and more reliable.

description of the drawings:

FIG. 1 is a schematic diagram of a system architecture;

fig. 2 is a logic diagram of the starting gear selection and 2-gear safety protection control of the light truck automatic transmission.

In the figure: 1. electronic selector, 2, derailleur the control unit TCU, 3, AMT derailleur, 4, instrument assembly, 5, pencil.

The specific implementation mode is as follows:

the following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

the starting gear selection control system of the AMT automatic transmission shown in figure 1 is adopted to jump into a certain light truck AMT automatic transmission, and the starting gear selection and protection method of the AMT automatic transmission shown in figure 2 is adopted.

A starting gear selection control system of an AMT (automated mechanical transmission) mainly comprises an electronic manipulator, an AMT (automated mechanical transmission), a TCU (transmission control unit), an instrument and a wire harness;

The electronic manipulator is used for shifting the gear by a user to operate the electronic mechanism and transmitting a driving requirement to the TCU control unit according to the selection of the driver gear;

the AMT automatic transmission comprises a transmission body, a gear selecting and shifting power unit and an actuating mechanism;

The TCU control unit is a control module of the AMT, performs gear selection and shifting and clutch control according to an instruction of the electronic gear shifter, meets driving requirements and performs safety protection on a driver;

the instrument carries out gear display, buzzing, character screen flipping and other human-computer interface communication according to the requirements of the TCU control unit;

Wiring harness: the electronic manipulator, the AMT automatic transmission, the TCU control unit and the instrument are connected and used for conducting electricity and transmitting signals.

And the electronic manipulator E2 mode switch is integrated and distributed on the electronic manipulator, and the electronic manipulator E2 mode switch is integrated with the economic mode function switch and selectively triggered by a user according to needs.

1. The main design idea of the invention is as follows:

1.1, setting a default 1-gear starting mode in a D-gear A mode of the electronic manipulator; the electronic manipulator E2 mode switch is arranged on the electronic manipulator, is integrated with the economy mode function switch, is started in economy mode 2, and is selectively triggered by a user according to requirements;

1.2, E2 gear starting protection judgment method based on clutch temperature rise: setting a starting temperature rise threshold value at 2 gears with different rotating speeds according to temperature rise calculation data of a thermal model of the TCU clutch, wherein the threshold value is used as a judgment condition for improper selection and protection requirement of 2 gears of starting;

1.3, intelligent downshift safety strategy: and when the temperature rise of the clutch exceeds the corresponding threshold value under different rotating speeds of the gear 2, intelligently performing a safety protection strategy of reducing the gear 1.

1.4, instrument warning strategy: when starting intelligent downshift, automatically switching 1-gear starting + buzzer prompt tones through human-computer friendly prompt, if 2-gear character flicker + screen flicking character' gear selection is not appropriate, and prompting a driver to select an improper gear strategy;

1.5, intelligent mode switching strategy: and if the driver does not respond, the AMT control system automatically returns to the A mode to execute the starting according to the default 1 gear.

2. Starting gear selection and protection method for AMT (automated mechanical Transmission)

2.1, starting gear mode switch application and switching description:

and in the A mode, the system defaults to set 1-gear starting, all working conditions are met, especially the load is large, and the working conditions with more ramps are met, and the A mode is recommended to be used for driving.

The E2 mode is an economic mode of 2-gear starting and is suitable for the purposes of quick and light-load starting and fuel saving.

Pressing E2 during A mode launch activates the 2 gear launch function. Depressing the E2 mode switch again may cancel the 2-gear launch function and return to the a-mode first gear launch.

after the mode A starts, when the vehicle runs in the first gear, if E2 is pressed, the vehicle can directly run in the 2 gear.

2.2, a starting gear selection strategy:

And the driver selects a starting gear according to the load and the hill. The system defaults to 1-gear starting and meets the use requirements of all working conditions. When a driver is in idle load, light load or on a small slope, an optional E2 starting mode of E2 fuel-saving and quick starting is provided, and the driving requirement is met;

when a driver selects a D-gear A mode, the electronic controller sends gear information to the TCU in a high-low level or CAN information message mode, and TCU software receives the gear high-low level or CAN information message and selects 1-gear starting by combining with other judgment, so that a 1-gear starting function is realized;

when a driver selects to press an E2 gear mode switch, the electronic manipulator sends gear information to the TCU in a high-low level or CAN information message mode, and the TCU software receives the gear high-low level or CAN information message and selects 2-gear starting by combining with other judgment, so that the 2-gear starting function is realized;

2.3 starting gear selection protection strategy:

Improper starting gear selection, which herein means including: 1) the 2 nd gear starts on a flat road under a large load; 2) 2, the vehicle is lifted up in a slope when no load is carried out; 3) a certain gradient is lifted when the gear 2 is light load; under the working conditions, if a driver fails to switch to shift 1-gear starting in time, the AMT control system needs to be capable of identifying and protecting, and the protection strategy is as follows:

2-gear starting protection safety strategy based on clutch temperature rise: if the starting gear is not properly selected, the TCU control system judges the risk according to the starting temperature rise of the clutch under different rotating speeds of the 2 gears, and when the temperature rise exceeds a certain set safety threshold value, the system can automatically switch the starting gear and intelligently protect the 1 gear; meanwhile, the system sends a message to the instrument through the TCU to prompt improper starting of the 2 nd gear: the 2-gear character flicker + the screen flicking character 'gear selection is not appropriate, and the 1-gear starting' + buzzer prompt tone is automatically switched. The instrument warns for 2 times, and if the driver does not respond, the AMT control system automatically returns to the A mode and starts to execute according to the default 1 gear.

2-gear starting protection safety strategy mechanism based on clutch temperature rise: under the condition that the matching of the whole vehicle is determined, the starting temperature rise of the clutch is influenced by the starting rotating speed of the engine, and the influence of the quality and the gradient of the whole vehicle is large. For the purpose of protecting the clutch, the purpose of protecting the clutch can be achieved by setting the starting temperature rise threshold value of the 2 nd gear at various rotating speeds, and the abuse working condition of the 2 nd gear is avoided.

The starting gear selection and 2-gear safety protection control logic diagram of the light truck automatic transmission is shown in an attached figure 2.

the foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.