CN114382808B - Intermediate shaft brake control method - Google Patents
Intermediate shaft brake control method Download PDFInfo
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- CN114382808B CN114382808B CN202210071001.XA CN202210071001A CN114382808B CN 114382808 B CN114382808 B CN 114382808B CN 202210071001 A CN202210071001 A CN 202210071001A CN 114382808 B CN114382808 B CN 114382808B
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- intermediate shaft
- brake
- electromagnetic valve
- shaft brake
- target value
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D65/00—Parts or details
- F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
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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
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D2121/00—Type of actuator operation force
- F16D2121/02—Fluid pressure
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Transmission Device (AREA)
Abstract
The invention relates to the technical field of automatic transmission control, and discloses a control method of an intermediate shaft brake. The intermediate shaft brake is inflated by opening an air inlet electromagnetic valve and closing an air outlet electromagnetic valve, so that the intermediate shaft braking capacity is built; after a period of time, the air pressure of the intermediate shaft brake is kept by closing the air inlet electromagnetic valve and closing the air outlet electromagnetic valve, and the intermediate shaft brake is carried out with stable braking torque; before the intermediate shaft rotation speed reaches the intermediate shaft rotation speed control target value, an exhaust electromagnetic valve is opened to exhaust the intermediate shaft brake and release the intermediate shaft brake, and if the intermediate shaft rotation speed does not reach the intermediate shaft rotation speed control target value and the intermediate shaft brake is released, the process is repeated until the intermediate shaft rotation speed reaches the intermediate shaft rotation speed control target value. The invention realizes the rapid speed reduction of the intermediate shaft, improves the control precision of the rotating speed of the intermediate shaft, and ensures that the brake of the intermediate shaft is released when the rotating speed of the intermediate shaft reaches the target rotating speed of the intermediate shaft.
Description
Technical Field
The invention relates to the technical field of automatic transmission control, in particular to a control method of an intermediate shaft brake.
Background
The sliding tooth sleeve gear shifting mode is widely applied to automatic transmissions, and the automatic transmission adopting the sliding tooth sleeve gear shifting mode achieves gear shifting action under proper rotation speed difference by reducing the rotation speed of the intermediate shaft in the gear shifting process. When the gear shifting rotation speed difference is improper, the problems of large gear shifting impact, gear shifting failure, even damage of the sliding gear sleeve and the like can occur in the gear shifting of the sliding gear sleeve. In order to shorten the gear shifting time and quickly finish the speed reduction of the intermediate shaft, an intermediate shaft brake which takes a wet friction plate as a braking element and a cylinder as an actuating element is widely adopted in an automatic transmission adopting a sliding gear sleeve gear shifting mode, and the rotating speed of the intermediate shaft is quickly reduced to a target rotating speed through the braking action of the intermediate shaft brake so as to meet the gear shifting requirement of the sliding gear sleeve.
Because pneumatic control has strong time lag, the friction characteristics of the wet friction plate are complex, and when the intermediate shaft speed reduction control is performed, the pneumatic control valve is unreasonable to control, and the problems of over-braking, long braking time, inaccurate intermediate shaft speed difference control and the like can possibly occur. When the braking problem appears, in the slip facing bar gear shifting process, the jackshaft is slowed down too fast and makes the rotational speed difference of shifting unsuitable, appears shifting failure or shift impact big scheduling problem. When the problem of long over-braking time occurs, the automatic transmission is caused to have long power interruption time in gear shifting.
In the prior art, a method for controlling a transmission brake is known from the patent (CN 201180013486.7) for controlling a transmission brake of an automatic transmission which is embodied in the form of a countershaft design and is provided with a claw clutch, wherein the braking torque of the countershaft brake is adjusted by opening an intake valve, the countershaft brake is held under a certain countershaft braking torque, and then the time for closing the countershaft brake is calculated in advance on the basis of the input rotational speed and the input rotational speed gradient, and the braking torque is calculated based on this, assuming that the braking torque is linearly released during the release of the countershaft brake. However, this patent does not consider that brake torque release is nonlinear and related to braking time, and this control method may cause problems such as inaccurate control of the rotation speed of the intermediate shaft, over braking, etc., and may cause a shift failure, a long shift time, or a shift shock problem.
Disclosure of Invention
Based on the problems, the invention aims to provide a control method of an intermediate shaft brake, which can realize rapid speed reduction of the intermediate shaft brake, prevent the occurrence of over-braking, improve the rotational speed control precision of the intermediate shaft brake, ensure successful gear shifting and reduce gear shifting impact.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method of intermediate shaft brake control, comprising:
s1, determining an intermediate shaft brake inflation time target value according to an intermediate shaft brake deceleration speed target initial value, transmission oil temperature at the intermediate shaft brake starting time and intermediate shaft brake air supply pressure at the intermediate shaft brake starting time;
s2, opening an air inlet electromagnetic valve, closing an air outlet electromagnetic valve, and inflating an intermediate shaft brake;
s3, recording the opening time of the air inlet electromagnetic valve, judging whether the opening time of the air inlet electromagnetic valve is larger than a target value of the inflation time of the intermediate shaft brake, if the opening time of the air inlet electromagnetic valve is larger than the target value of the inflation time of the intermediate shaft brake, performing step S4, and if the opening time of the air inlet electromagnetic valve is not larger than the target value of the inflation time of the intermediate shaft brake, returning to step S2;
s4, closing an air inlet electromagnetic valve, closing an air outlet electromagnetic valve, and keeping the pressure of the intermediate shaft brake;
s5, calculating to obtain a determination value of the intermediate shaft brake release rotational speed difference;
s6, judging whether the residual intermediate shaft braking rotation speed difference is not higher than an intermediate shaft braking rotation speed difference judging value, if so, performing step S7, and if so, returning to step S4;
s7, closing an air inlet electromagnetic valve, opening an air outlet electromagnetic valve, and exhausting the intermediate shaft brake;
s8, judging whether the current intermediate shaft rotating speed is not higher than an intermediate shaft rotating speed control target value, and if the current intermediate shaft rotating speed is not higher than the intermediate shaft rotating speed control target value, performing a step S9;
and S9, finishing intermediate shaft braking, and keeping the air inlet electromagnetic valve closed and the air outlet electromagnetic valve open.
As an alternative to the intermediate shaft brake control method of the present invention, in step S8, if the current intermediate shaft rotational speed is higher than the intermediate shaft rotational speed control target value, step S10 is performed;
the step S10 includes: recording the opening time of the exhaust electromagnetic valve, judging whether the opening time of the exhaust electromagnetic valve is larger than a jackshaft brake release time judgment value, if so, performing step S11, and if not, returning to step S7;
the step S11 includes: and judging whether the current intermediate shaft deceleration rate is not higher than the intermediate shaft brake release brake judgment intermediate shaft deceleration rate, if the current intermediate shaft deceleration rate is not higher than the intermediate shaft brake release brake judgment intermediate shaft deceleration rate, performing step S1, and if the current intermediate shaft deceleration rate is higher than the intermediate shaft brake release brake judgment intermediate shaft deceleration rate, returning to step S7.
As an alternative to the intermediate shaft brake control method of the present invention, in step S11, an intermediate shaft brake release brake determination intermediate shaft deceleration rate is determined from the current intermediate shaft rotational speed and the transmission oil temperature.
As an alternative to the intermediate shaft brake control method of the present invention, step S1 further includes: the transmission oil temperature and the intermediate shaft brake supply air pressure at the intermediate shaft brake start time are obtained.
As an alternative to the intermediate shaft brake control method of the present invention, step S1 further includes: obtaining the intermediate shaft rotating speed at the intermediate shaft braking starting moment, and obtaining the intermediate shaft speed reduction speed difference target value by making a difference between the intermediate shaft rotating speed at the intermediate shaft braking starting moment and the intermediate shaft rotating speed control target value.
As an alternative to the intermediate shaft brake control method of the present invention, step S1 further includes: and determining a target initial value of the intermediate shaft braking deceleration rate according to the transmission oil temperature at the intermediate shaft braking starting moment, the intermediate shaft brake air supply pressure at the intermediate shaft braking starting moment and the intermediate shaft deceleration speed difference target value.
As an alternative to the intermediate shaft brake control method of the present invention, in step S5, the intermediate shaft brake release rotational speed difference basic value and the intermediate shaft brake release delay deceleration value are summed to obtain an intermediate shaft brake release rotational speed difference determination value.
As an alternative to the intermediate shaft brake control method of the present invention, in step S5, an intermediate shaft brake release rotational speed difference base value and an exhaust valve opening delay time are determined from the current intermediate shaft deceleration rate and transmission oil temperature.
As an alternative to the intermediate shaft brake control method of the present invention, in step S5, the exhaust valve opening delay time is multiplied by the current intermediate shaft deceleration rate to obtain the intermediate shaft brake release delay deceleration value.
As an alternative to the inventive intermediate shaft brake control method, in step S6, the current intermediate shaft rotational speed is differed from the intermediate shaft braking rotational speed target value to obtain a remaining intermediate shaft braking rotational speed difference.
The beneficial effects of the invention are as follows:
the intermediate shaft brake control method is suitable for an intermediate shaft brake system provided with an air inlet electromagnetic valve and an air outlet electromagnetic valve, and firstly, the intermediate shaft brake is inflated by opening the air inlet electromagnetic valve and closing the air outlet electromagnetic valve, so that the intermediate shaft brake capacity is built; secondly, after a period of time, the air pressure of the intermediate shaft brake is kept by closing the air inlet electromagnetic valve and closing the air outlet electromagnetic valve, and the intermediate shaft brake is carried out with stable braking torque; then, before the intermediate shaft rotation speed reaches the intermediate shaft rotation speed control target value, the exhaust solenoid valve is opened to perform intermediate shaft brake exhaust and intermediate shaft brake release, and if the intermediate shaft rotation speed does not reach the intermediate shaft rotation speed control target value and the intermediate shaft brake is released, the above-described process is repeated until the intermediate shaft rotation speed reaches the intermediate shaft rotation speed control target value. The intermediate shaft brake control method provided by the invention realizes the rapid speed reduction of the intermediate shaft, prevents the over-braking problem, improves the control precision of the rotating speed of the intermediate shaft, ensures that the intermediate shaft is braked and released when the rotating speed of the intermediate shaft reaches the target rotating speed of the intermediate shaft, ensures the successful gear shifting of the sliding gear sleeve, reduces gear shifting impact, and overcomes the defects of the prior art that the braking time of the intermediate shaft is long, the over-braking of the intermediate shaft and the control of the braking rotating speed difference of the intermediate shaft are inaccurate, and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a flow chart of a method for controlling a countershaft brake according to an exemplary embodiment of the present invention.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed 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. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1, the present embodiment provides a control method of an intermediate shaft brake, which is applied to an intermediate shaft brake system equipped with a double solenoid valve of an intake solenoid valve and an exhaust solenoid valve, comprising the steps of:
s1, determining an intermediate shaft brake inflation time target value according to an intermediate shaft brake deceleration speed target initial value, transmission oil temperature at the intermediate shaft brake starting time and intermediate shaft brake air supply pressure at the intermediate shaft brake starting time;
s2, opening an air inlet electromagnetic valve, closing an air outlet electromagnetic valve, and inflating an intermediate shaft brake;
s3, recording the opening time of the air inlet electromagnetic valve, judging whether the opening time of the air inlet electromagnetic valve is larger than a target value of the inflation time of the intermediate shaft brake, if the opening time of the air inlet electromagnetic valve is larger than the target value of the inflation time of the intermediate shaft brake, performing step S4, and if the opening time of the air inlet electromagnetic valve is not larger than the target value of the inflation time of the intermediate shaft brake, returning to step S2;
s4, closing an air inlet electromagnetic valve, closing an air outlet electromagnetic valve, and keeping the pressure of the intermediate shaft brake;
s5, calculating to obtain a determination value of the intermediate shaft brake release rotational speed difference;
s6, judging whether the residual intermediate shaft braking rotation speed difference is not higher than an intermediate shaft braking rotation speed difference judging value, if so, performing step S7, and if so, returning to step S4;
s7, closing an air inlet electromagnetic valve, opening an air outlet electromagnetic valve, and exhausting the intermediate shaft brake;
s8, judging whether the current intermediate shaft rotating speed is not higher than an intermediate shaft rotating speed control target value, and if the current intermediate shaft rotating speed is not higher than the intermediate shaft rotating speed control target value, performing a step S9;
and S9, finishing intermediate shaft braking, and keeping the air inlet electromagnetic valve closed and the air outlet electromagnetic valve open.
In step S8, if the current intermediate shaft rotational speed is higher than the intermediate shaft rotational speed control target value, step S10 is performed;
the step S10 includes: recording the opening time of the exhaust electromagnetic valve, judging whether the opening time of the exhaust electromagnetic valve is larger than a jackshaft brake release time judgment value, if so, performing step S11, and if not, returning to step S7;
the step S11 includes: and judging whether the current intermediate shaft deceleration rate is not higher than the intermediate shaft brake release brake judgment intermediate shaft deceleration rate, if the current intermediate shaft deceleration rate is not higher than the intermediate shaft brake release brake judgment intermediate shaft deceleration rate, performing step S1, and if the current intermediate shaft deceleration rate is higher than the intermediate shaft brake release brake judgment intermediate shaft deceleration rate, returning to step S7.
In step S11, a countershaft brake release brake determination countershaft deceleration rate is determined based on the current countershaft rotational speed and transmission oil temperature.
Step S1 further includes: the transmission oil temperature and the intermediate shaft brake supply air pressure at the intermediate shaft brake start time are obtained.
Step S1 further includes: obtaining the intermediate shaft rotating speed at the intermediate shaft braking starting moment, and obtaining the intermediate shaft speed reduction speed difference target value by making a difference between the intermediate shaft rotating speed at the intermediate shaft braking starting moment and the intermediate shaft rotating speed control target value.
Step S1 further includes: and determining a target initial value of the intermediate shaft braking deceleration rate according to the transmission oil temperature at the intermediate shaft braking starting moment, the intermediate shaft brake air supply pressure at the intermediate shaft braking starting moment and the intermediate shaft deceleration speed difference target value.
In step S5, the intermediate shaft brake release rotational speed difference basic value and the intermediate shaft brake release delay deceleration value are summed to obtain an intermediate shaft brake release rotational speed difference determination value.
In step S5, a countershaft brake-release rotational speed differential base value and an exhaust valve opening delay time are determined based on the current countershaft deceleration rate and transmission oil temperature.
In step S5, the exhaust valve opening delay time is multiplied by the current intermediate shaft deceleration rate to obtain an intermediate shaft brake release delay deceleration value.
In step S6, the current intermediate shaft rotational speed is differed from the intermediate shaft braking rotational speed target value to obtain a remaining intermediate shaft braking rotational speed difference.
According to the intermediate shaft brake control method provided by the embodiment, firstly, the air inlet electromagnetic valve is opened, the air outlet electromagnetic valve is closed, the intermediate shaft brake is inflated, and the intermediate shaft brake capacity is built; secondly, after a period of time, the air pressure of the intermediate shaft brake is kept by closing the air inlet electromagnetic valve and closing the air outlet electromagnetic valve, and the intermediate shaft brake is carried out with stable braking torque; then, before the intermediate shaft rotation speed reaches the intermediate shaft rotation speed control target value, the exhaust solenoid valve is opened to perform intermediate shaft brake exhaust and intermediate shaft brake release, and if the intermediate shaft rotation speed does not reach the intermediate shaft rotation speed control target value and the intermediate shaft brake is released, the above-described process is repeated until the intermediate shaft rotation speed reaches the intermediate shaft rotation speed control target value.
According to the intermediate shaft brake control method, the intermediate shaft is rapidly decelerated, the over-braking problem is prevented, the control precision of the intermediate shaft rotating speed is improved, when the intermediate shaft rotating speed reaches the intermediate shaft target rotating speed, the intermediate shaft is braked and released, the gear shifting success of the sliding gear sleeve is ensured, the gear shifting impact is reduced, and the defects of the prior art that the intermediate shaft braking time is long, the intermediate shaft over-braking and the intermediate shaft braking rotating speed difference control are inaccurate and the like are overcome.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (5)
1. A method of controlling an intermediate shaft brake, comprising the steps of:
s1, determining an intermediate shaft brake inflation time target value according to an intermediate shaft brake deceleration speed target initial value, transmission oil temperature at the intermediate shaft brake starting time and intermediate shaft brake air supply pressure at the intermediate shaft brake starting time;
s2, opening an air inlet electromagnetic valve, closing an air outlet electromagnetic valve, and inflating an intermediate shaft brake;
s3, recording the opening time of the air inlet electromagnetic valve, judging whether the opening time of the air inlet electromagnetic valve is larger than a target value of the inflation time of the intermediate shaft brake, if the opening time of the air inlet electromagnetic valve is larger than the target value of the inflation time of the intermediate shaft brake, performing step S4, and if the opening time of the air inlet electromagnetic valve is not larger than the target value of the inflation time of the intermediate shaft brake, returning to step S2;
s4, closing an air inlet electromagnetic valve, closing an air outlet electromagnetic valve, and keeping the pressure of the intermediate shaft brake;
s5, calculating to obtain a determination value of the intermediate shaft brake release rotational speed difference;
s6, judging whether the residual intermediate shaft braking rotation speed difference is not higher than an intermediate shaft braking rotation speed difference judging value, if so, performing step S7, and if so, returning to step S4;
s7, closing an air inlet electromagnetic valve, opening an air outlet electromagnetic valve, and exhausting the intermediate shaft brake;
s8, judging whether the current intermediate shaft rotating speed is not higher than an intermediate shaft rotating speed control target value, and if the current intermediate shaft rotating speed is not higher than the intermediate shaft rotating speed control target value, performing a step S9;
s9, braking the intermediate shaft is completed, and keeping the air inlet electromagnetic valve closed and the air outlet electromagnetic valve open;
in step S8, if the current intermediate shaft rotational speed is higher than the intermediate shaft rotational speed control target value, step S10 is performed;
the step S10 includes: recording the opening time of the exhaust electromagnetic valve, judging whether the opening time of the exhaust electromagnetic valve is larger than a jackshaft brake release time judgment value, if so, performing step S11, and if not, returning to step S7;
the step S11 includes: judging whether the current intermediate shaft deceleration rate is not higher than the intermediate shaft brake release brake judgment intermediate shaft deceleration rate, if the current intermediate shaft deceleration rate is not higher than the intermediate shaft brake release brake judgment intermediate shaft deceleration rate, performing step S1, and if the current intermediate shaft deceleration rate is higher than the intermediate shaft brake release brake judgment intermediate shaft deceleration rate, returning to step S7;
in step S11, determining a countershaft deceleration rate according to the current countershaft rotational speed and transmission oil temperature, wherein the countershaft braking releases the brake;
in step S5, the intermediate shaft brake release rotational speed difference basic value and the intermediate shaft brake release delay deceleration value are summed to obtain an intermediate shaft brake release rotational speed difference determination value;
in step S5, determining a basic value of a countershaft brake release rotational speed difference and an exhaust valve opening delay time according to the current countershaft deceleration rate and the transmission oil temperature;
in step S5, the exhaust valve opening delay time is multiplied by the current intermediate shaft deceleration rate to obtain an intermediate shaft brake release delay deceleration value.
2. The intermediate shaft brake control method according to claim 1, characterized in that step S1 further comprises: the transmission oil temperature and the intermediate shaft brake supply air pressure at the intermediate shaft brake start time are obtained.
3. The intermediate shaft brake control method according to claim 2, characterized in that step S1 further comprises: obtaining the intermediate shaft rotating speed at the intermediate shaft braking starting moment, and obtaining the intermediate shaft speed reduction speed difference target value by making a difference between the intermediate shaft rotating speed at the intermediate shaft braking starting moment and the intermediate shaft rotating speed control target value.
4. A method of controlling a mid-shaft brake according to claim 3, wherein step S1 further comprises: and determining a target initial value of the intermediate shaft braking deceleration rate according to the transmission oil temperature at the intermediate shaft braking starting moment, the intermediate shaft brake air supply pressure at the intermediate shaft braking starting moment and the intermediate shaft deceleration speed difference target value.
5. The intermediate shaft brake control method according to any one of claims 1 to 4, characterized in that in step S6, the difference between the current intermediate shaft rotational speed and the intermediate shaft braking rotational speed target value is made to obtain a remaining intermediate shaft braking rotational speed difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210071001.XA CN114382808B (en) | 2022-01-21 | 2022-01-21 | Intermediate shaft brake control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210071001.XA CN114382808B (en) | 2022-01-21 | 2022-01-21 | Intermediate shaft brake control method |
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| CN114382808A CN114382808A (en) | 2022-04-22 |
| CN114382808B true CN114382808B (en) | 2023-06-23 |
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| CN202210071001.XA Active CN114382808B (en) | 2022-01-21 | 2022-01-21 | Intermediate shaft brake control method |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115031019A (en) * | 2022-07-04 | 2022-09-09 | 一汽解放汽车有限公司 | Brake control method, device, controller and medium |
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| CN111473070A (en) * | 2020-05-08 | 2020-07-31 | 东风商用车有限公司 | Reset mechanism of intermediate shaft brake |
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| DE10330517A1 (en) * | 2003-07-05 | 2005-03-03 | Zf Friedrichshafen Ag | Method for controlling and regulating a transmission brake in a motor vehicle automatic transmission |
| JP6545988B2 (en) * | 2015-03-26 | 2019-07-17 | Ntn株式会社 | Electric brake device |
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| DE10065613B4 (en) * | 2000-05-09 | 2012-06-06 | Hyundai Motor Co. | A method in an automatic transmission for controlling a shift to a neutral state when stopping in a first gear |
| JP2003185000A (en) * | 2001-12-19 | 2003-07-03 | Kanzaki Kokyukoki Mfg Co Ltd | Transmission for working vehicle |
| CN102792065A (en) * | 2010-03-11 | 2012-11-21 | Zf腓德烈斯哈芬股份公司 | Method for controlling a transmission brake |
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| CN111473070A (en) * | 2020-05-08 | 2020-07-31 | 东风商用车有限公司 | Reset mechanism of intermediate shaft brake |
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