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Method and device for controlling the engaged gear of an automatic gearbox of a vehicle according to an acceleration requested by a speed control system

An automatic transmission and speed control technology, applied in the field of vehicles, can solve the problems that the minimum acceleration level cannot be guaranteed, and downshifts cannot be avoided.

Active Publication Date: 2015-03-04
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These downshifts are usually delayed according to the speed difference, which in most cases neither guarantees the minimum acceleration level for the functioning of the speed control system nor avoids unnecessary downshifts

Method used

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  • Method and device for controlling the engaged gear of an automatic gearbox of a vehicle according to an acceleration requested by a speed control system
  • Method and device for controlling the engaged gear of an automatic gearbox of a vehicle according to an acceleration requested by a speed control system
  • Method and device for controlling the engaged gear of an automatic gearbox of a vehicle according to an acceleration requested by a speed control system

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Embodiment Construction

[0021] The object of the present invention is to propose a control method and a related control device D capable of controlling the gears engaged in an automatic gearbox BV of a vehicle V having a speed control system SC.

[0022] In the following description, as a non-limiting example, the vehicle V is considered to be a type of motor vehicle. Relates to cars, for example. However, the invention is not limited to vehicles of this type. In fact the invention relates to all types of land vehicles comprising a engine group GM with an automatic gearbox BV.

[0023] Furthermore, in the following description, as a non-limiting example, the automatic gearbox BV is considered to be an automatic gearbox. However, the invention is not limited to this type of automatic transmission. In fact, the invention relates to all types of transmissions, in particular manually actuated transmissions and dual clutch transmissions (or DCTs), in which the change of gears can be controlled automati...

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Abstract

The invention relates to a method that is dedicated to the control of an automatic gearbox (BV) of a vehicle (V) provided with a power train (GM) and a speed control system (SC) having a programmable set speed. Said method involves determining the gear to be engaged in the gearbox (BV) depending on a maximum acceleration of the vehicle (V) for the gear that is currently engaged in the gearbox (BV), the current speed of the vehicle (V), a programmed set speed of the system (SC), and an acceleration value requested by the system (SC).

Description

technical field [0001] The invention relates to a vehicle comprising an engine block for an automatic transmission. [0002] The "automatic transmission" heard here is a transmission that can automatically control the change of gears. This is especially the case with automatic transmissions, manual transmissions or dual-clutch transmissions (or DCTs). Background technique [0003] Certain vehicles, possibly of the automobile type, include a speed control system that ensures the function of the governor and / or the function of the speed limiter. As known to the skilled person, once activated by the driver of the vehicle and programmed with a speed setpoint, such systems are responsible in particular for determining the torque value to the engine block used to bring the current speed of the vehicle towards this programmed speed. speed setpoint. [0004] When the vehicle includes an automatic transmission, the gear range engaged in the transmission needs to be automatically s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/02
CPCF16H61/0213F16H59/48F16H59/44
Inventor T·赫克斯韦勒A·格里尔
Owner PEZHO SITROEN AUTOMOBILS SA
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