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Method for controlling shifting in automatic multi-stage gear transmission

A technology of transmissions, gears, applied in the direction of transmission control, control devices, elements with teeth, etc., can solve problems not known from the previously mentioned literature, etc.

Active Publication Date: 2013-05-29
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, no specific instructions on how a specific control is to be derived from topographical data such as height distribution, gradient distribution or driving resistance distribution for the road section ahead of the motor vehicle can be obtained from the above-mentioned documents. commanded and executed in the transmission control unit

Method used

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  • Method for controlling shifting in automatic multi-stage gear transmission
  • Method for controlling shifting in automatic multi-stage gear transmission

Examples

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Embodiment Construction

[0039] exist figure 1 , in part a) plots the relevant vehicle with respect to the distance traveled x F The driving resistance distribution F determined by the terrain data, in particular the height distribution, of the road section ahead of the motor vehicle FW (x F ), where the current vehicle position and waypoint x F =0 corresponding. A motor vehicle is a vehicle with m Fzg =Heavier commercial vehicles with a vehicle mass of 40,000kg. exist figure 1 part b) of , using G 0 =12 indicates the gear currently placed. exist figure 1 In part c), use n Mot (0)=850 points -1 Shows the current rotational speed of the drive motor.

[0040] exist figure 1 In the operating phase shown in , the motor vehicle is in so-called brake-regulating operation, in which the setpoint speed set by the driver is activated by corresponding actuation of existing permanent brakes (such as engine brake and retarder) is kept constant as long as the maximum possible continuous braking force F...

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Abstract

The invention relates to a method for controlling shifting in an automatic multi-stage gear transmission that lies in a motor vehicle powertrain, which is provided with a permanent brake, between a drive motor that is designed as an internal combustion engine and an axle drive. Topographical data relating to a road section that lies ahead of the motor vehicle, in particular the height profile, is ascertained during travel together with current vehicle-, road-, and driver-specific operating parameters. The tractive resistance profile (FFW(xF)) of the motor vehicle for the road section that lies ahead is determined from said data and parameters, and control commands for closed-throttle downshifts and / or closed-throttle upshifts are derived and implemented dependent on the tractive resistance profile (FFW(xF)) in the automatic mode of the gear transmission during closed-throttle operation. According to the invention, this is achieved in that the maximum permanent braking force curves (FBr_max(xF)) that are possible in the road section that lies ahead in the currently engaged gear (G0) and in each gear adjacent to said engaged gear are determined based on the current traveling speed (vF(0)), the current engine speed (MMot(0)), and the tractive resistance profile (FFW(xF). The maximum permanent braking force curves (FBr_max(xF)) are analyzed in order to derive control commands for closed-throttle downshift and / or closed-throttle upshift in relation to the tractive resistance profile (FFW(xF)).

Description

technical field [0001] The invention relates to a method for the shift control of an automated multi-step transmission according to the preamble of patent claim 1 . Background technique [0002] Modern multi-shift transmissions such as automatic shift transmissions, planetary automatic transmissions and dual clutch transmissions can be operated not only in manual mode but also in automatic mode. In the manual mode, the gearshift can be triggered directly by the driver, for example, by turning a selector lever provided for this purpose with his hand in the upshift direction or in the downshift direction, for example. In contrast, in automatic mode, a gear change is triggered automatically in such a way that the current vehicle-specific, lane-specific and driver-specific operating parameters are determined and the gear change is performed by means of the shift A characteristic curve group or a shift characteristic curve is triggered. These operating parameters may include cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/02
CPCB60W40/076B60W10/184B60W40/072F16H61/0213B60W2550/143F16H2059/663B60W10/11F16H2059/366F16H61/21F16H2061/0237B60W2552/20F16H59/66F16H2061/0234
Inventor 迈克·维特纳亚历山大·迈尔约阿希姆·施陶丁格约翰内斯·克姆勒
Owner ZF FRIEDRICHSHAFEN AG
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