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Process and device for controlling a gearsift of an automatic gearbox

By utilizing the slipping operation and torque control of the clutch in the automatic transmission, it is possible to reduce the torque overlap during shifting and shift out of the initial gear in advance, solving the problems of traction interruption and insufficient power during automatic transmission shifting, and improving efficiency. Shifting efficiency and driving power.

Inactive Publication Date: 2008-10-15
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] DE 101 32 738 A1 therefore offers a valuable solution for reducing interruptions of traction in relation to gear disengagement in automatic multi-speed transmissions, but on the one hand is based on the continuous determination and evaluation of the acceleration of the vehicle, and on the other hand the problem of mounting the selected target file as quickly and efficiently as possible has not been studied in any way

Method used

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Examples

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Embodiment Construction

[0040] For the present invention, it is irrelevant whether the control devices each act directly on the components and assemblies involved or only cooperate with each other in the sense that they transmit or provide the other controllers with the information required for carrying out the method. , so the following example first introduces what actually happens at the component level.

[0041] at time point t 0 , the vehicle is in quasi-static driving mode with a gear engaged. The setpoint injection quantity me_soll, which essentially determines the drive torque of the engine and is used synonymously here with the drive torque, is almost constant and the clutch is fully engaged, so that the engine speed n_mot is the same as the speed n_ge of the automatic transmission input shaft.

[0042] at the point in time t 0 The signal to initiate the shift is issued, whereby the clutch stroke is adjusted from the previously fully closed position initially at high speeds and, from the c...

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Abstract

The invention relates to a control process for an automatic gear box which permits gears to be shifted, in particular downshifted, with minimum interruption of tractive power. The phase in which the driving moment of the propulsion engine is reduced, the phase in which the frictional connection in the automatic gear box is interrupted, and the phase in which the rotational speed of the gear box input shaft is adapted to a suitable target rotational speed are designed in such a way that they overlap in time at least in part. In particular, when the frictional connection is interrupted in the automatic gear box, the propulsion engine transmits over the clutch a driving moment to the input shaft of the automatic gear box, causing a change in the rotational speed of the gear box input shaft (n_ge) which tends towards the synchronous rotational speed of the new gear.; The invention also relates to a device for carrying out this process.

Description

technical field [0001] The invention relates to a method for controlling shifting of an automatic transmission according to the preamble of claim 1 and to a device for carrying out the method. Background technique [0002] Automatic transmissions have long been used on different types of cars. In the case of a manual transmission, the driver coordinates several devices temporally and as the case may be when changing gears, while an automatic transmission frees the driver from these operations and thus allows him to concentrate better. focus on traffic conditions. [0003] Of course, an experienced car driver executes shifting in a number of ways by timing the engagement of the clutch and accelerator pedals, by the timing and speed at which the shift lever is operated, and by the force applied to the shift lever at the same time. file process and optimize it corresponding to his then intentions. For example, if he wishes to change gears particularly comfortably and without...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/04B60W10/10F16H63/50B60W10/02B60W10/06B60W30/18
CPCY10T477/675B60W2710/0666B60W10/02B60W10/06B60W10/11B60W30/19F16H61/0403Y10T477/79F16H2306/48F16H63/502Y10T477/677B60W2710/027F16H63/50
Owner ZF FRIEDRICHSHAFEN AG
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