US 2014/0324309 A1Published application

Method and system for calibrating an estimated clutch characteristic curve

AssigneeVolvo Lastvagnar AB

InventorsFredrik Karpenman, Behrooz Razaznejad, Henrik Ryberg, Sami Aho, Fredrik Sjöqvist

Life of this patent

Estimating the term…

Loading patent…

Abstract

A method and a system for calibrating an estimated clutch characteristic curve of a dual-clutch vehicle transmission are provided. The method includes mechanically interconnecting a first input shaft with a second input shaft, whereby a transmission output shaft is disengaged; controlling, according to a first alternative, a regulating parameter of a first clutch regulator such that a first friction clutch is engaged with a first torque transmission capability, that a second friction clutch (initially is disengaged, and subsequently engaged; or according to a second alternative, that the second friction clutch is initially engaged, a regulating parameter of the first clutch regulator such that the first friction clutch is engaged with a first torque transmission capability, and that the second friction clutch subsequently disengaged; calculating a torque transmission capability of the second friction clutch; and adjusting an estimated clutch characteristic curve of the second friction clutch.

Claims15

Dependent claims

A method for calibrating an estimated clutch characteristic curve of a dual-clutch assembly of a transmission for a motor vehicle, wherein the transmission comprising a dual-clutch assembly with a first friction clutch, a first clutch regulator, a second friction clutch, and a second clutch regulator, a first input shaft connected to the first friction clutch, a second input shaft connected to the second friction clutch, at least one countershaft arranged parallel with at least one of the first and second input shafts, gearwheels, tooth clutches, and a transmission output shaft, wherein each of the friction clutches being drivingly connected to a prime mover by means of a clutch input shaft, and wherein different speed ratios between the clutch input shaft and the transmission output shaft can be established by selective engagement of the friction clutches and tooth clutches, characterised in that the method comprising:

mechanically interconnecting the first input shaft with the second input shaft with a known gear ratio, whereby the transmission output shaft is disengaged from the clutch input shaft;
controlling,
according to a first alternative, a regulating parameter of the first clutch regulator such that the first friction clutch is engaged with a first torque transmission capability, that the second friction clutch initially is fully disengaged, and subsequently being engaged;
or
according to a second alternative, that the second friction clutch is initially fully engaged, a regulating parameter of the first clutch regulator such that the first friction clutch is engaged with a first torque transmission capability, and that the second friction clutch subsequently being disengaged;
calculating a torque transmission capability of the second friction clutch at a certain regulating parameter of the second clutch regulator;
and
adjusting an estimated clutch characteristic curve of the second friction clutch.

5 more elements

A dual-clutch calibration system for calibrating an estimated clutch characteristic curve of a dual-clutch assembly of a motor vehicle transmission, which comprises a dual-clutch assembly having a first friction clutch, a first clutch regulator, a second friction clutch, and a second clutch regulator, a first input shaft connected to the first friction clutch, a second input shaft connected to the second friction clutch, at least one countershaft arranged parallel with at least one of the first and second input shafts, gearwheels, tooth clutches, a transmission output shaft, and a control unit, wherein each of the friction clutches being drivingly connected to a prime mover by means of a clutch input shaft, and wherein different speed ratios between the clutch input shaft and the transmission output shaft can be established by selective engagement of the friction clutches and tooth clutches, wherein:

the first input shaft is mechanically interconnected with the second input shaft via a known gear ratio, wherein the transmission output shaft is disengaged from the clutch input shaft;
the control unit is arranged to control,
according to a first alternative, a regulating parameter of the first clutch regulator such that the first friction clutch is engaged with a first torque transmission capability, that the second friction clutch initially is fully disengaged, and subsequently being engaged;
or
according to a second alternative, that the second friction clutch is initially fully engaged, a regulating parameter of the first clutch regulator such that the first friction clutch is engaged with a first torque transmission capability, and that the second friction clutch subsequently being disengaged;
the control unit is arranged to calculate a torque transmission capability of the second friction clutch at a certain regulating parameter of the second clutch regulator;
and in that
the control unit is arranged to adjust an estimated clutch characteristic curve of the second friction clutch.

5 more elements

Dependencies are inferred from the claim text.