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Method For Broadening The Function Of A Transmission Brake
Inactive Publication Date: 2008-03-13
ZF FRIEDRICHSHAFEN AG
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[0037] In a seventh embodiment of the inventive method, the transmission brake can be calibrated by means of a simple permutation of an independent input parameter and a parameter that is supposed to be calibrated or monitored for plausibility through targeted control of the torque that is to be transferred by the main clutch to the transmission input shaft, and/or the connection between an actuation signal of the transmission brake and the developing braking torque can be checked for plausibility, or as the case may be, calibrated.
[0038] Thereby, in modification of the method described above, in a neutral position of the transmission, defined torque will be applied to the input shaft of the transmission by means of a main clut
Problems solved by technology
This solution is suitable for regulating the synchronization of normal shifting operations, however, with respect to regulation,
Method used
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[0015] In a first embodiment, the invention provides for the torque, which is conditional on the inertial masses of the ancillary drive systems connected to the gearbox, to be taken into account for the control and / or regulation of the braking torque, and that ancillary drive systems are decelerated by the transmission brake with an engaged clutch. Ancillary drive systems shall be understood here as transmission output shafts which enable the operation of units or devices by the drive motor of the motor vehicle in addition to the usual gears that act on the driving wheels of the motor vehicle. These units or devices can be intended for operation when the vehicle is at a standstill or during drive operation.
[0016] Ancillary outputs coupled to the transmission, or as the case may be, the units or devices connected to the ancillary drives, may, depending on their type and operating conditions, have considerable rotational masses, which only diminish slowly when coupled with an open ma...
Example
[0021] In a second embodiment of the method according to the invention, a transmission brake used to synchronize the transmission is utilized in a special mode to secure the motor vehicle against unintentional coasting.
[0022] There are many known processes and devices to prevent unintentional coasting of a stationary motor vehicle without action being taken by the driver. They usually operate with automatic control of the main brake or the emergency brake. While systems that act on the emergency brake usually require actuators that are used exclusively for this purpose, which makes the vehicle more expensive and increases the weight of the vehicle, the required actuators for systems that act on the main brake are already present in modern vehicles.
[0023] In principle, however, it is not desirable to increase the complexity of a highly safety-relevant system, such as the brake control, through additional functions. This disadvantage is avoided by using the transmission brake to sec...
Example
[0027] A third embodiment of the inventive method provides for a torque that is applied to the transmission via the main clutch to be compensated for, wholly or in part, through control of the transmission brake. It can be particularly useful, for example, when starting up, to initially intensify the torque present in the transmission, so that the vehicle is prevented from coasting backward when starting on an incline. Even when the actual torque set by the main clutch exceeds the target torque, it can be compensated for by a corresponding braking torque of the transmission brake. In the event that the torque transmitted by the main clutch is also supposed to be reduced, the transmission brake can reduce the torque applied to the output shaft of the gearbox until the main clutch is correspondingly positioned. This enables slower and thus more precise positioning of the clutch, while quickly achieving the desired torque on the output side of the transmission at the same time. An addi...
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Abstract
A method for controlling and regulating a transmission brake which, for the purpose of synchronization, determines a target rotational speed of a shaft that is to be synchronized on the basis of an actual rotational speed of a transmission shaft, and controls a transmission brake such that the determined target rotational speed is set for the shaft that is supposed to be synchronized. The transmission brake also carries out additional functions. These functions require no, or only minimal, additional hardware complexity in a cost-neutral way, but considerably increase the functional and practical value of the transmission brake. The comfort and speed of shifting operations, the protection, or as the case may be the detection of error states in sensors, clutch, main clutch, and motor control are improved, and undesirable transmission states avoided. It is also possible to account for and influence other conditions, such as the operation of ancillary devices.
Description
[0001] This application is a national stage completion of PCT / EP2005 / 007696 filed Jul. 15, 2005 which claims priority from German Application Serial No. 10 2004 045 828.6 filed Sep. 22, 2004.FIELD OF THE INVENTION [0002] The invention relates to a method for broadening the function of a transmission brake in a conventional transmission. BACKGROUND OF THE INVENTION [0003] Conventional transmissions have been used for some time in different types of motor vehicles. The predominant construction method is the so-called countershaft construction method, in which the torque of an input shaft of the gearbox is transmitted to a countershaft and from there to an output shaft. Located on the shafts is a plurality of gearwheel trains corresponding to the number of gears. Each gearwheel train has at least one idler gear, which is mounted in a rotatable manner on a shaft, thereby enabling the simultaneous meshing of the gearwheel trains with different transmission ratios. When a gear is engaged,...
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Application Information
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