CN106641225B - Shifting points scaling method, the apparatus and system of automatic transmission - Google Patents

Shifting points scaling method, the apparatus and system of automatic transmission Download PDF

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Publication number
CN106641225B
CN106641225B CN201510713289.6A CN201510713289A CN106641225B CN 106641225 B CN106641225 B CN 106641225B CN 201510713289 A CN201510713289 A CN 201510713289A CN 106641225 B CN106641225 B CN 106641225B
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automatic transmission
maximum
speed
engine
gear
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CN106641225A (en
Inventor
康树利
宣华
张占春
何长胜
刘晓龙
陶隆棋
任俊俊
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Great Wall Motor Co Ltd
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Great Wall Motor Co 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/19—Improvement of gear change, e.g. by synchronisation or smoothing gear shift
    • 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

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

Abstract

The present invention provides shifting points scaling method, the apparatus and systems of a kind of automatic transmission, are related to vehicle self shifter control technology field, because the ride comfort caused by the shift quality of automatic transmission is poor is bad when solving the problems, such as engine cold-starting.The shifting points scaling method of the automatic transmission includes: the maximum (top) speed that engine can reach when obtaining engine cold-starting；Determine that the maximum input speed of automatic transmission, the maximum input speed of automatic transmission are equal with the maximum (top) speed of engine according to the maximum (top) speed of engine；According to the maximum input speed of automatic transmission, the maximum output revolving speed of automatic transmission when automatic transmission is in a gear is calculated；The maximum output revolving speed of automatic transmission is demarcated are as follows: automatic transmission rises the shifting points revolving speed of second gear from a gear when zero throttle.The shifting points scaling method of the automatic transmission is applied in automatic transmission.

Description

Gear shifting point calibration method, device and system of automatic transmission
Technical Field
The invention relates to the technical field of vehicle automatic gear shifting control, in particular to a gear shifting point calibration method, a gear shifting point calibration device and a gear shifting point calibration system of an automatic transmission.
Background
Along with the popularization of automatic transmission automobiles, the requirements of users on the gear shifting quality of the automatic transmission automobiles are also improved, and the riding comfort is directly influenced by the quality of the gear shifting quality. The gear shifting quality refers to the smoothness of the gear shifting process, namely the vehicle speed is changed stably in the gear shifting process, and excessive instantaneous acceleration or instantaneous deceleration cannot occur. One of the main factors influencing the gear shifting quality is the calibration of the gear shifting point, and if the calibration of the gear shifting point is unreasonable, the gear shifting smoothness is influenced, so that the riding comfort is influenced.
In an existing automatic transmission automobile, a gear shifting point calibration method is generally determined according to the automobile speed, different gears correspond to different automobile speed ranges, and when the current automobile speed reaches the automobile speed of the corresponding gear, the gear automatically rises or falls to the gear corresponding to the current automobile speed. However, the inventor of the present application finds that the shift point calibration method in the prior art is not perfect in the research and development process, for example, when the engine is started at a low temperature, the rotation speed of the engine at the low temperature is much higher than the target idle speed, so that the gear of the automatic transmission is shifted from the first gear to the second gear at the idle speed after the engine is started at the low temperature, and if the accelerator is stepped on at the time, an excessively high instantaneous acceleration occurs, so that the vehicle speed is suddenly accelerated, the shift quality is poor, and the riding comfort is poor.
Disclosure of Invention
In view of this, the present invention is directed to a shift calibration method for an automatic transmission to solve the problem of poor ride comfort caused by poor shift quality of the automatic transmission when an engine is started at a low temperature.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a shift point calibration method of an automatic transmission, comprising:
acquiring the maximum rotating speed which can be reached by an engine when the engine is started at a low temperature;
determining a maximum input rotation speed of an automatic transmission according to the maximum rotation speed of the engine, wherein the maximum input rotation speed of the automatic transmission is equal to the maximum rotation speed of the engine;
calculating the maximum output rotating speed of the automatic transmission when the automatic transmission is in the first gear according to the maximum input rotating speed of the automatic transmission;
calibrating a maximum output speed of the automatic transmission to: and when the accelerator is zero, the rotating speed of the automatic transmission is increased from the first gear to the second gear at the gear shifting point.
Further, in the shift point calibration method of the automatic transmission, the following formula is used to calculate the maximum output speed n of the automatic transmission when the automatic transmission is in the first gear2：
n2＝n1/r，
Wherein n is1R is a speed ratio corresponding to first gear, which is the maximum input rotation speed of the automatic transmission.
Further, in the shift point calibration method for an automatic transmission, the step of acquiring the maximum rotational speed that can be reached by the engine when the engine is started at a low temperature includes:
measuring the rotation speed n respectively corresponding to the engine when the engine is started at low temperature under different cooling water temperaturesf；
Comparing each of the rotational speeds nfAll rotational speeds nfIn nfThe maximum value is the maximum speed of the engine.
Further, in the shift point calibration method of an automatic transmission described above, the cooling water temperature range is: thirty degrees below zero to ten degrees above zero.
Compared with the prior art, the method for calibrating the gear shifting point of the automatic transmission has the following advantages:
the invention discloses a gear-shifting point calibration method of an automatic transmission, which is applied to the low-temperature starting of an engine, and the rotating speed of a gear-shifting point (gear-shifting point) for shifting the first gear and the second gear of the automatic transmission under a zero accelerator is set as the maximum rotating speed which can be output by the automatic transmission in the first gear under a theoretical state; in practical application, when the automatic transmission is in the first gear, the actual output rotating speed of the automatic transmission cannot reach the maximum output rotating speed of the automatic transmission in a theoretical state, so that when the engine idles after being started at a low temperature, the automatic transmission cannot trigger the first gear to raise the second gear, and if the accelerator is stepped at the moment, the overhigh instantaneous acceleration cannot occur, namely, the vehicle speed cannot be suddenly accelerated, so that the gear shifting quality can be ensured, and the riding comfort can be further improved.
Another objective of the present invention is to provide a shift calibration device for an automatic transmission to solve the problem of poor riding comfort caused by poor shift quality of the automatic transmission when an engine is started at a low temperature.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a shift point calibration apparatus of an automatic transmission, comprising:
an acquisition unit configured to acquire a maximum rotational speed that can be reached by an engine when the engine is started at a low temperature;
a calculation unit for determining a maximum input rotation speed of an automatic transmission according to a maximum rotation speed of the engine, the maximum input rotation speed of the automatic transmission being equal to the maximum rotation speed of the engine; and
calculating the maximum output rotating speed of the automatic transmission when the automatic transmission is in the first gear according to the maximum input rotating speed of the automatic transmission;
a determination unit for scaling a maximum output rotation speed of the automatic transmission to: and when the accelerator is zero, the rotating speed of the automatic transmission is increased from the first gear to the second gear at the gear shifting point.
Further, in the shift point calibration device for an automatic transmission, the calculation means calculates the maximum output rotation speed n of the automatic transmission when the automatic transmission is in the first gear, using the following equation2：
n2＝n1/r，
Wherein n is1R is a speed ratio corresponding to first gear, which is the maximum input rotation speed of the automatic transmission.
Further, in the above shift point calibration device for an automatic transmission, the obtaining unit includes a measuring unit and a comparing unit, wherein,
the measuring unit is used for measuring the rotating speed n respectively corresponding to the engine when the engine is started at low temperature under different cooling water temperaturesf；
The comparison unit is used for comparing each rotating speed nfAll rotational speeds nfIn nfThe maximum value is the maximum speed of the engine.
Further, in the shift point calibration device for an automatic transmission, the temperature of the cooling water is: thirty degrees below zero to ten degrees above zero.
Compared with the prior art, the gear shifting point calibration device of the automatic transmission has the following advantages: compared with the prior art, the gear shifting point calibration device of the automatic transmission and the gear shifting point calibration method of the automatic transmission have the same advantages, and are not described again.
Another objective of the present invention is to provide a shift calibration system for an automatic transmission to solve the problem of poor riding comfort caused by poor shift quality of the automatic transmission when an engine is started at a low temperature.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a shift point calibration system of an automatic transmission, comprising:
the system comprises a rotating speed sensor, a controller and a controller, wherein the rotating speed sensor is used for acquiring the maximum rotating speed which can be reached by an engine when the engine is started at a low temperature;
a processor for determining a maximum input speed of an automatic transmission according to a maximum speed of the engine, the maximum input speed of the automatic transmission being equal to the maximum speed of the engine; and
calculating the maximum output rotating speed of the automatic transmission when the automatic transmission is in the first gear according to the maximum input rotating speed of the automatic transmission; and
calibrating a maximum output speed of the automatic transmission to: and when the accelerator is zero, the rotating speed of the automatic transmission is increased from the first gear to the second gear at the gear shifting point.
Further, in the system for calibrating a shift point of an automatic transmission, the processor is a traveling computer or an automatic transmission control unit.
Compared with the prior art, the gear shifting point calibration system of the automatic transmission has the following advantages: compared with the prior art, the gear shifting point calibration system of the automatic transmission and the gear shifting point calibration method of the automatic transmission have the same advantages, and are not described again.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a shift point calibration method of an automatic transmission according to an embodiment of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In addition, the low-temperature starting of the engine mentioned in the embodiment of the invention refers to that when the temperature of cooling water in the engine ranges from minus thirty degrees to minus ten degrees (-30 degrees to 10 degrees), the engine is restarted after being stopped for a long time, which is called the low-temperature starting of the engine; the temperature of the cooling water is the same as or similar to the temperature of the environment where the engine is located before low-temperature starting.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, a method for calibrating a shift point of an automatic transmission according to an embodiment of the present invention includes the steps of:
step 101, acquiring the maximum rotating speed which can be reached by an engine when the engine is started at a low temperature;
102, determining the maximum input rotation speed of an automatic transmission according to the maximum rotation speed of an engine, wherein the maximum input rotation speed of the automatic transmission is equal to the maximum rotation speed of the engine;
103, calculating the maximum output rotating speed of the automatic transmission when the automatic transmission is in the first gear according to the maximum input rotating speed of the automatic transmission;
step 104, calibrating the maximum output speed of the automatic transmission as: and when the accelerator is zero, the rotating speed of the automatic transmission is increased from the first gear to the second gear at the gear shifting point.
In step 101, the rotational speeds n corresponding to the engine at low temperature start at different cooling water temperatures are measuredfComparing each rotation speed nfAll rotational speeds nfIn nfThe maximum value is the maximum speed n of the enginemax. For example, when the cooling water temperature is at six temperature points of-30 DEG, -20 DEG, -10 DEG, -5 DEG and 10 DEG, the rotational speed n corresponding to the respective temperature points at which the engine is cold-started is measuredfAnd from these six rotational speeds nfIn which one n is selectedfMaximum number of revolutions, nfThe maximum speed is the maximum speed n that the engine can reachmax。
It is worth mentioning that the engine can be started at a low temperature for a plurality of times at the same temperature point, and a plurality of n corresponding to the engine respectively when the engine is started at the temperature point for a plurality of times at the low temperature are obtainedfValue, then calculate a plurality of nfThe average value of the values, for example, when the cooling water temperature is-30 deg., ten engine revolutions n respectively corresponding to ten engine cold starts at-30 deg. are measuredfThen calculate these ten rotational speeds nfIs the average value of:when the temperature of cooling water is-30 degrees, the corresponding rotating speed n is realized when the engine is started at low temperaturefThus, the rotating speed n of the engine during low-temperature starting at different temperature points can be increasedfSo that the maximum rotational speed n of the engine can be increasedmaxThe accuracy of (2).
In step 102, since the input shaft of the automatic transmission is connected to the output shaft of the engine via the torque converter, if the torque converter is in the locked state, the slip of the torque converter is 0rpm, and the engine speed is the speed of the input shaft of the automatic transmission, and therefore the maximum speed n of the engine is the speed of the input shaft of the automatic transmissionmaxI.e. the maximum input speed n of the automatic transmission1I.e. n1＝nmax。
In step 103, when the structure of the automatic transmission is determined, the speed ratios corresponding to the different gears (the gear ratios of the gear pairs corresponding to the different gears) are also determined, and therefore, according to the maximum input rotation speed n of the automatic transmission, the maximum input rotation speed n is determined1The maximum output speed n of the automatic transmission can be calculated according to the speed ratio r corresponding to the first gear of the automatic transmission2. Maximum output speed n of automatic transmission2The specific calculation formula is as follows:
n2＝n1/r，
wherein n is1R is a speed ratio corresponding to first gear, which is the maximum input rotation speed of the automatic transmission.
In step 104, according to the description of step 103, if the shift point (upshift point) rotation speed corresponding to the first-gear upshift and the second-gear upshift of the automatic transmission is set to n under the zero throttle condition, the shift point is set to n2So that when the automatic transmission is at zero throttle, only when the output shaft speed of the automatic transmission reaches n2The first gear is triggered to raise the second gear. However, in practical use, the torque converter cannot be locked up in the first gear, and therefore the slip of the torque converter is not equal to 0rpm, and therefore the actual input rotation speed n of the automatic transmission3Less than the speed of the engine, i.e.Actual input speed n of automatic transmission3Less than the maximum input speed n of the automatic transmission1(ii) a If n is3<n1Calculating formula n based on the actual output rotation speed of the automatic transmission4＝n3R, can be calculated to yield n4<n2That is, when the automatic transmission is in first gear, the actual output rotation speed n of the automatic transmission4Less than the speed n of the shift point2. Therefore, when the engine idles after being started at low temperature, if the D gear is engaged at the moment, the brake is released without stepping on the accelerator, and the actual output rotating speed n of the automatic transmission is caused4Less than the speed n of the shift point2Therefore, the gears of the automatic transmission are not shifted up to two.
In summary, by using the method for calibrating a shift point of an automatic transmission provided by the embodiment of the present invention, the rotation speed of the shift point (upshift point) at which the automatic transmission is shifted from the first gear to the second gear under the zero throttle is set as the maximum rotation speed that can be output by the automatic transmission in the first gear under the theoretical state; in practical applications, the actual output rotation speed of the automatic transmission when the automatic transmission is in first gear is the maximum output rotation speed of the automatic transmission that cannot reach the theoretical state, and therefore, when the engine is started at a low temperature, the actual output rotation speed n of the automatic transmission is4Is less than the maximum output speed n of the automatic transmission2That is, the actual output speed n of the automatic transmission4Less than the speed n of the shift point2Therefore, when the engine is idling after being started at a low temperature, the gears of the automatic transmission cannot be shifted by one gear to two gears, so that if the accelerator is trodden at the moment, too high instantaneous acceleration cannot occur, namely, the speed of the vehicle cannot be suddenly accelerated, the gear shifting quality can be ensured, and the riding comfort can be improved.
The embodiment of the invention also provides a gear shifting point calibration device of an automatic transmission, which comprises:
the device comprises an acquisition unit, a control unit and a control unit, wherein the acquisition unit is used for acquiring the maximum rotating speed which can be reached by an engine when the engine is started at a low temperature;
the calculating unit is used for determining the maximum input rotating speed of the automatic transmission according to the maximum rotating speed of the engine, and the maximum input rotating speed of the automatic transmission is equal to the maximum rotating speed of the engine; and
calculating the maximum output rotating speed of the automatic transmission when the automatic transmission is in the first gear according to the maximum input rotating speed of the automatic transmission;
a determination unit for calibrating a maximum output rotation speed of the automatic transmission to: and when the accelerator is zero, the rotating speed of the automatic transmission is increased from the first gear to the second gear at the gear shifting point.
In the shift point calibration device for an automatic transmission according to the present embodiment, the shift point calibration method for the engine cold start adopts the shift point calibration method for an automatic transmission according to the above-described embodiment: setting the rotating speed of a gear shifting point (gear-up point) for the first gear and the second gear of the automatic transmission under the zero throttle as the maximum rotating speed which can be output by the automatic transmission in the first gear under the theoretical state; in practical application, when the automatic transmission is in the first gear, the actual output rotating speed of the automatic transmission cannot reach the maximum output rotating speed of the automatic transmission in a theoretical state, so that when the engine idles after being started at a low temperature, the automatic transmission cannot trigger the first gear to raise the second gear, and if the accelerator is stepped at the moment, the overhigh instantaneous acceleration cannot occur, namely, the vehicle speed cannot be suddenly accelerated, so that the gear shifting quality can be ensured, and the riding comfort can be further improved.
In the shift point calibration device for an automatic transmission, the calculation means calculates the maximum output rotation speed n of the automatic transmission when the automatic transmission is in first gear using the following equation2：
n2＝n1/r，
Wherein n is1R is a speed ratio corresponding to first gear, which is the maximum input rotation speed of the automatic transmission.
In the above-described embodiment, the acquisition unit includes a measurement unit for measuring the rotation speeds n respectively corresponding to the engine at low-temperature start-up at different cooling water temperatures, and a comparison unitf(ii) a Comparison ofMeans for comparing each of said rotational speeds nfAll rotational speeds nfIn nfThe maximum value is the maximum speed of the engine. For example, when the temperature of the cooling water is at six temperature points of-30 °, -20 °, -10 °, -5 °, and 10 °, the measuring unit may measure the rotation speed n corresponding to the respective temperature points when the engine is cold-startedfAnd from these six rotational speeds nfIn which one n is selectedfMaximum number of revolutions, nfThe maximum speed is the maximum speed n that the engine can reachmax。
An embodiment of the present invention further provides a shift point calibration system for an automatic transmission, including:
the rotating speed sensor is used for acquiring the maximum rotating speed which can be reached by the engine when the engine is started at a low temperature;
a processor for determining a maximum input rotation speed of the automatic transmission according to a maximum rotation speed of the engine, the maximum input rotation speed of the automatic transmission being equal to a maximum rotation speed of the engine; and
calculating the maximum output rotating speed of the automatic transmission when the automatic transmission is in the first gear according to the maximum input rotating speed of the automatic transmission; and
the maximum output speed of the automatic transmission is calibrated as: and when the accelerator is zero, the rotating speed of the automatic transmission is increased from the first gear to the second gear at the gear shifting point.
Compared with the prior art, the gear shifting point calibration system of the automatic transmission and the gear shifting point calibration method of the automatic transmission have the same advantages, and are not described again.
In the above embodiments, the processor may be a driving computer or an automatic transmission control unit, and the setting manner of the driving computer or the automatic transmission control unit in the vehicle is well known to those skilled in the art, and therefore, is not described herein again.
It should be added that each embodiment in this specification is described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the apparatus embodiment, since it is substantially similar to the method embodiment, it is relatively simple to describe, and reference may be made to some descriptions of the method embodiment for relevant points.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A shift point calibration method of an automatic transmission, characterized by comprising:
acquiring the maximum rotating speed which can be reached by an engine when the engine is started at a low temperature;
determining a maximum input rotation speed of an automatic transmission according to the maximum rotation speed of the engine, wherein the maximum input rotation speed of the automatic transmission is equal to the maximum rotation speed of the engine;
calculating the maximum output rotating speed of the automatic transmission when the automatic transmission is in the first gear according to the maximum input rotating speed of the automatic transmission;
calibrating a maximum output speed of the automatic transmission to: when the accelerator is zero, the automatic transmission increases the rotation speed of a gear shifting point of the first gear and the second gear;
wherein,
calculating the maximum output speed n of the automatic transmission when the automatic transmission is in first gear by adopting the following formula2：
n2＝n1/r，
Wherein n is1R is a speed ratio corresponding to first gear, which is the maximum input rotation speed of the automatic transmission.
2. The shift point calibration method of an automatic transmission according to claim 1, characterized in that the step of acquiring the maximum rotational speed that can be reached by an engine at a cold engine start comprises:
measuring the rotation speed n respectively corresponding to the engine when the engine is started at low temperature under different cooling water temperaturesf；
Comparing each of the rotational speeds nfAll rotational speeds nfIn nfThe maximum value is the maximum speed of the engine.
3. The shift point calibration method of an automatic transmission according to claim 2, characterized in that the cooling water temperature range is: thirty degrees below zero to ten degrees above zero.
4. A shift point calibration device of an automatic transmission, characterized by comprising:
an acquisition unit configured to acquire a maximum rotational speed that can be reached by an engine when the engine is started at a low temperature;
a calculation unit for determining a maximum input rotation speed of an automatic transmission according to a maximum rotation speed of the engine, the maximum input rotation speed of the automatic transmission being equal to the maximum rotation speed of the engine; and
calculating the maximum output rotating speed of the automatic transmission when the automatic transmission is in the first gear according to the maximum input rotating speed of the automatic transmission;
a determination unit for scaling a maximum output rotation speed of the automatic transmission to: when the accelerator is zero, the automatic transmission increases the rotation speed of a gear shifting point of the first gear and the second gear;
wherein,
the calculation unit calculates the maximum output speed n of the automatic transmission when the automatic transmission is in the first gear by adopting the following formula2：
n2＝n1/r，
Wherein n is1R is a speed ratio corresponding to first gear, which is the maximum input rotation speed of the automatic transmission.
5. The shift point calibration apparatus of an automatic transmission according to claim 4, wherein the obtaining unit includes a measuring unit and a comparing unit, wherein,
the measuring unit is used for measuring the rotating speed n respectively corresponding to the engine when the engine is started at low temperature under different cooling water temperaturesf；
The comparison unit is used for comparing each rotating speed nfAll rotational speeds nfIn nfThe maximum value is the maximum speed of the engine.
6. The shift point calibration apparatus of an automatic transmission according to claim 5, wherein the temperature of the cooling water is: thirty degrees below zero to ten degrees above zero.
7. A shift point calibration system of an automatic transmission, characterized by comprising:
the system comprises a rotating speed sensor, a controller and a controller, wherein the rotating speed sensor is used for acquiring the maximum rotating speed which can be reached by an engine when the engine is started at a low temperature;
a processor for determining a maximum input speed of an automatic transmission according to a maximum speed of the engine, the maximum input speed of the automatic transmission being equal to the maximum speed of the engine; and
calculating the maximum output rotating speed of the automatic transmission when the automatic transmission is in the first gear according to the maximum input rotating speed of the automatic transmission; and
calibrating a maximum output speed of the automatic transmission to: when the accelerator is zero, the automatic transmission increases the rotation speed of a gear shifting point of the first gear and the second gear;
wherein,
the processor calculates the maximum output speed n of the automatic transmission when the automatic transmission is in the first gear by adopting the following formula2：
n2＝n1/r，
Wherein n is1R is a speed ratio corresponding to first gear, which is the maximum input rotation speed of the automatic transmission.
8. The system for calibrating a shift point of an automatic transmission according to claim 7, wherein said processor is a traveling computer or an automatic transmission control unit.
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