US 2004/0073348 A1Published application

Control method for an automatic transmission of an engine-driven vehicle

AssigneeMagneti Marelli Powertrain S.p.A.

InventorNicola Stragapede

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Abstract

A control method for an automatic transmission in which a first and a second control system are provided and regulate the transmission ratio respectively in automatic and in manual mode. The method comprises the stages of activating the first control system and automatically setting a transmission ratio, detecting the presence of a manual command from an operator to modify the transmission ratio in use, performing the manual command from the operator by modifying the transmission ratio set automatically, silencing the first control system for a predetermined time interval such that the transmission ratio set following the manual command is not modified following any automatic gear change request from the first control system, and attributing the control of the automatic transmission to the first control system.

Claims5

Dependent claims

A control method for an automatic transmission (1) in which a first control system of automatic type (22) receives as input data signals and processes them in order to generate drive signals (OPEN/CLOSE, SEL, ENG/DIS) for the transmission and automatically to set an optimum transmission ratio, this automatic transmission (1) further comprising a second control system (24) of manual type which receives as input control signals generated (17) by an operator in order to generate drive signals (OPEN/CLOSE, SEL, ENG/DIS) for the transmission and manually to set a transmission ratio, characterised in that it comprises the stages of:

activating (100) the first control system (22) and automatically setting a transmission ratio,
detecting the presence (110) of a manual command from an operator to modify the transmission ratio in use,
performing (130) the manual command from the operator by modifying the transmission ratio set automatically,
silencing (130) the first control system (22) for a predetermined time interval (Tsleep) such that the transmission ratio set following the manual command is not modified as a result of an automatic gear change request from the first control system (22),
attributing (100) the control of the automatic transmission to the first control system (22).

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/065,444Filed 18 Oct 2002
Priority: IT TO2001A00100219 Oct 2001
Published: 15 Apr 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

F16H 61/0248
The signals being electric: control units where shifting is directly initiated by the driver, e.g. semi-automatic transmissions
F16H 59/02
Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion: selector apparatus
F16H 2059/006
Control inputs to control units of change-speed- or reversing-gearings for conveying rotary motion: overriding automatic control
F16H 2300/14
Determining of new ratio: selecting a state of operation, e.g. depending on two wheel or four wheel drive mode

Family

US 6,885,929 B2Related patent
US 2004/0073348 A1This patent

From the US filing history. Foreign family members aren’t listed.

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