Interrelated power delivery controls – including engine control – Transmission control – With clutch control
Reexamination Certificate
1998-06-24
2001-05-22
Ta, Khoi Q. (Department: 3681)
Interrelated power delivery controls, including engine control
Transmission control
With clutch control
C477S110000, C074S335000
Reexamination Certificate
active
06234933
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a method and a device for controlling a transmission group of a vehicle.
As is known, a transmission group of a vehicle comprises a gearbox, a clutch intended for releasably coupling the gearbox with the vehicle engine, a first actuating group coupled with the clutch so as to command opening and closing type actuation of the clutch and a second and a third actuating group coupled with the gearbox for commanding respectively selection and engagement/disengagement of the gears.
The transmission group also co-operates with a control device outputting command signals to the actuating groups for the activation of the clutch and the selection and engagement/disengagement of the gears.
At the moment, the known control devices generate command signals for the actuating group accomplishing engagement/disengagement of the gears having width time patterns determined in the design stage of the control devices in relation to the type of gearbox assembled on board the vehicle.
These time patterns are in some cases unsuitable for optimum management of the various operating and running conditions of the vehicle as they are determined without taking into account factors having a considerable impact on the performance, comfort and running safety of the vehicle such as, for example, the driving style (normal or sporty) of the driver, or the gear shift to be effected.
The known control devices are, moreover, incapable of intervening in good time under gearbox operating conditions that may prove to be particularly dangerous such as, for example, failures or jamming that do not permit engagement of the required gear.
SUMMARY OF THE INVENTION
The scope of this invention is therefore that of producing a control device and method that permit more effective management of the transmission group in order to improve the performance, comfort and running safety of the vehicle.
Preferably the control device and method according to this invention must also be capable of intervening appropriately in cases of failure or jamming of the gearbox.
According to this invention, a method is produced for controlling the transmission group of a vehicle, said transmission group comprising a gearbox and actuating means coupled with the gearbox for commanding engagement/disengagement of the gears;
said method comprising the step of generating at least one command signal for said actuating means during a gear change manoeuvre; said command signal having a width of time pattern defined by a plurality of characteristic values;
said method being characterized in that it comprises the step of:
a) calculating at least a first of said characteristic values in relation to at least one operative reference value representing a respective gear shift to be effected during said gear change manoeuvre and an operative correction value representing a respective style of driving the vehicle.
According to this invention, a device is also produced for controlling a transmission group of a vehicle, said transmission group comprising a gearbox and actuating means coupled with the gearbox for commanding engagement/disengagement of the gears;
said control device comprising signal generating means generating at least one command signal for said actuating means during a gear change manoeuvre; said command signal having a width the time pattern of which is defined by a plurality of characteristic values;
said control device being characterized in that said signal generating means comprise calculating means suitable for calculating at least a first of said characteristic values in relation to at least one operative reference value representing a respective gear shift to be effected during said gear change manoeuvre and an operative correction value representing a respective style of driving the vehicle.
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European Patent Office International Search Report Corresponding to ApplicationSer. No. 98111633.8-2306-.
Baker & Daniels
Magneti Marelli S.p.A.
Ta Khoi Q.
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