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Method for operating a motor vehicle comprising an all-wheel drive that can be enabled and disabled by determining an angular acceleration of components which are uncoupled when the all-wheel drive is disabled

A technology of all-wheel drive and angular acceleration, applied in the direction of transportation and packaging, mechanical equipment, vehicle parts, etc., to achieve the effect of improving rationality or precision

Active Publication Date: 2017-08-18
AUDI AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if there are other unknowns besides running-in or wear of the unknown bearings and seals, such as the lubricating oil temperature or the oil level in the axle transmission, the resulting drag torques can hardly be reasonably specified anymore

Method used

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  • Method for operating a motor vehicle comprising an all-wheel drive that can be enabled and disabled by determining an angular acceleration of components which are uncoupled when the all-wheel drive is disabled
  • Method for operating a motor vehicle comprising an all-wheel drive that can be enabled and disabled by determining an angular acceleration of components which are uncoupled when the all-wheel drive is disabled
  • Method for operating a motor vehicle comprising an all-wheel drive that can be enabled and disabled by determining an angular acceleration of components which are uncoupled when the all-wheel drive is disabled

Examples

Experimental program
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Embodiment Construction

[0022] exist figure 1 The motor vehicle 1 shown schematically in FIG. 1 has a drive train 2 with an internal combustion engine 3 and a shift transmission 4 connected downstream of the internal combustion engine 3 . An output of the transmission 4 is connected to a continuously driven primary axle 5 of the motor vehicle 1 , which is the front axle. The other output of the transmission 4 can be connected via an all-wheel clutch 6 to a switchable secondary axle 7 , which is a rear axle. When all-wheel clutch 6 is disengaged, the torque of internal combustion engine 3 is fully present at primary axle 5 . When all-wheel clutch 6 is engaged, the torque of internal combustion engine 3 is distributed not only to primary axle 5 but also to secondary axle 7 .

[0023] The secondary axle 7 comprises: an axle transmission 8 with a balanced differential 9 connected to the driven side of the all-wheel clutch 6 via a connecting shaft 10 in the form of a cardan shaft; two side hinges shaft...

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Abstract

The invention relates to a method for operating a motor vehicle (1) comprising an all-wheel drive that can be enabled and disabled, and a drive train (2) comprising two clutches (6, 13) controlled by a control device (14) for enabling and disabling the all-wheel drive, and components (8, 9 10, 16) rotating between both clutches (6, 13), which components (8, 9, 10, 16) are driven when the all-wheel drive is enabled and uncoupled from the remaining drive train (2) when the all-wheel drive is disabled . In order to allow early detection of defects and in particular bearing defects of the rotating components (10, 16, 22, 23), and to determine the applied drag torque even without knowing the oil temperature, it is proposed according to the invention that, when the all-wheel drive is disabled, the rotational speed (n) of at least one of the uncoupled components (10, 16, 22, 23) is measured in the interval, and an angular acceleration (a) of the uncoupled components (10, 16, 22, 23) is determined.

Description

technical field [0001] The invention relates to a method for operating a motor vehicle with an all-wheel drive and a powertrain system which can be switched on and off, the powertrain system comprising two Turns on and off the clutches of all-wheel drive and the components that rotate between the clutches that are driven when all-wheel drive is on and communicate with the rest of the powertrain system when all-wheel drive is off. Partially decoupled. Background technique [0002] DE 10 2012 020 908 A1 of the applicant already knows a method for operating a motor vehicle with all-wheel drive of the type mentioned at the outset, which has a continuously driven primary or front axle and a switchable and the switched off secondary or rear axle, the drive of which is switched on or off by the controller depending on the current driving situation. One of the important advantages of this switchable all-wheel drive is that by switching off the all-wheel drive when it is not needed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/12B60K23/08
CPCB60K23/08F16H61/12B60K2023/0825B60K2023/0833B60Y2400/421B60K23/0808B60Y2400/42
Inventor D·魏德曼H·哈尼克F·科尔布H·J·布吕尔
Owner AUDI AG
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