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Method for controlling an automatic transmission of a motor vehicle

A technology for automatic transmissions and motor vehicles, applied in control devices, vehicle components, transmission control and other directions, can solve the problems of not guaranteeing deceleration, not considering differential power, etc.

Active Publication Date: 2020-02-07
RENAULT SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0035] US 20140066251 describes a strategy that is only valid for the vehicle when changing only one gear ratio at a time, since the strategy only prohibits upshifts (prohibited from gear ratios N+2 or N+3) based on a given vehicle deceleration level all upshifts) and does not take into account differential forces that may be caused by headwinds, slopes, etc., and therefore does not guarantee a given deceleration

Method used

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  • Method for controlling an automatic transmission of a motor vehicle
  • Method for controlling an automatic transmission of a motor vehicle
  • Method for controlling an automatic transmission of a motor vehicle

Examples

Experimental program
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Embodiment Construction

[0063] The purpose of the developed control method is to inhibit driveline states that do not comply with the deceleration constraints generated according to the driving conditions.

[0064] This method can be used for all internal combustion engines, hybrid vehicles and electric vehicles equipped with automatic transmissions, whether involving partial or total interruption of traction torque and whether with at least two different drive train states.

[0065] Its principle of operation consists in calculating the force constraints that the drive train state must produce in order to produce a given deceleration.

[0066] Therefore, in the calculation, many physical parameters associated with the vehicle are taken into account:

[0067] Estimates of resistance (slope, wind, etc.),

[0068] · Real or virtual driver force or torque targets at the wheels (RV / LV ADAS, ACC, etc.),

[0069] the longitudinal acceleration of the vehicle,

[0070] · Vehicle speed,

[0071] the quali...

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Abstract

A method for controlling an automatic transmission of a motor vehicle having at least two different driveline states is disclosed herein. The method includes the steps of determining a minimum deceleration force requirement to be achieved by the driveline state based on the vehicle's speed, longitudinal acceleration, and drag experienced by the vehicle, and then, based on the deceleration force set point, the current driveline state, and The minimum force achieved by the state makes a decision to authorize or disable the driveline state for which the minimum deceleration force requirement has been calculated.

Description

technical field [0001] The technical field of the invention is that of controlling gearboxes of motor vehicles and more particularly of automatic gearboxes. Background technique [0002] Controlling a hybrid powertrain typically includes the function of generating driveline state targets. [0003] This functionality enables determination of a driveline state target that optimizes the operating point of the hybrid powertrain. [0004] It has to be mentioned that the driveline state is defined by a combination of coupler state(s) and retarder state(s) specific to a given vehicle architecture. [0005] For a transmission of a vehicle with an internal combustion engine, one example of a driveline state is an engaged first retarder state and an engaged state of a clutch between the internal combustion engine and the transmission. For a transmission of a hybrid vehicle, one example of a driveline state is a disengaged state of a clutch connected to the front wheels between the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60W30/18
CPCB60W30/18072B60W30/18109B60W2530/16B60W2520/105B60W2520/10F16H61/0213F16H2059/663F16H59/22F16H59/44F16H59/48F16H59/54F16H59/66F16H2061/0227F16H2061/0237
Inventor F·勒-卡姆F·鲁多A·勒菲弗尔
Owner RENAULT SA