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Compensation for the effect of lateral acceleration on the brake downshift point

A technology of lateral acceleration and downshift point, applied in the direction of components with teeth, transmission control, road vehicle drive control system, etc., can solve problems such as interference

Active Publication Date: 2018-11-20
DR ING H C F PORSCHE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the following problem arises in this known method: if braking into a curve under lateral acceleration, the possible deceleration of the vehicle is less than that on a straight road section
This can be disturbing, especially in dynamic driving styles

Method used

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  • Compensation for the effect of lateral acceleration on the brake downshift point
  • Compensation for the effect of lateral acceleration on the brake downshift point
  • Compensation for the effect of lateral acceleration on the brake downshift point

Examples

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Embodiment Construction

[0028] In these different figures, identical parts are provided with the same reference signs and are therefore generally also named accordingly or mentioned only once.

[0029] exist figure 1 In , a method for obtaining a downshift point for an automatic transmission according to the prior art is schematically illustrated.

[0030] In a first step S1, the normal downshift point R is determined. When the rotational speed of the automatic transmission falls below the downshift point R, a gear is shifted into the next lower gear. The normal downshift point R is independent of forces acting on the vehicle, such as acceleration, deceleration and lateral acceleration.

[0031] In a second step S2, a control unit detects the deceleration (a_l) of the vehicle, which describes the deceleration of the vehicle (eg during braking or during a road ascent). For this purpose, the control unit can have, for example, an acceleration sensor.

[0032] In a third step S3, an enhancement fact...

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Abstract

A method for controlling an automatic transmission of a vehicle includes detecting a deceleration of the vehicle; detecting a cornering value of the vehicle; determining, as a function of the deceleration and as a function of the cornering value, a compensated shift-down point of a rotational speed at which shifting into a relatively low gear of the transmission occurs; and selecting a gear as a function of the compensated shift-down point.

Description

technical field [0001] The invention relates to a method for increasing a downshift point to a higher rotational speed of an automatic transmission as a function of the deceleration of the vehicle. Background technique [0002] It is known that control units of automatic transmissions rely on the braking process and the deceleration of the vehicle associated therewith to increase the downshift point of the transmission and thereby shift into a lower gear earlier. As a result, the driving behavior is simulated similarly to operating a manual transmission, so that the moment of inertia of the engine can be better utilized when braking. This also enables a dynamic driving style by, for example, downshifting before cornering. [0003] For example the Applicant's Intelligent Shift Program (ISP) provides a known solution for increasing the downshift point in an automatic transmission. The smart shift routine relies on deceleration (a_l) to increase the downshift point. [0004]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H59/48F16H59/58
CPCF16H59/48F16H59/58F16H61/0213F16H61/21F16H2061/009F16H2061/0234B60Y2300/1815B60Y2300/70F16H2302/02
Inventor J-P·霍夫迈斯特T·米勒
Owner DR ING H C F PORSCHE AG
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