US 2017/0101083 A1Published application

Dct shifting control method for vehicle

AssigneeHyundai Motor Company

InventorsJae Sung BANG, Jae Kyu HYUN, Sang Joon KIM, Tae Hee JUNG

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Abstract

A DCT shifting control method of a vehicle includes: a temporary engaging step that engages an N-3 stage gear having a gear ratio larger than an N stage gear that is a currently engaged gear; a first torque switching step that starts to slip a first clutch engaged with the N-3 stage gear and disengages a second clutch engaged with the N stage gear that is the currently engaged gear; a synchronization speed adjusting step that synchronizes a speed of a power source of a vehicle with a desired input shaft speed by controlling the power source of the vehicle, disengages the N stage gear, and engages the N-2 stage gear that is the desired gear, with the slip of the first clutch maintained; and a second torque switching step that finishes shifting by disengaging the first clutch and engaging the second clutch.

Claims17

Dependent claims

A DCT shifting control method of a vehicle, comprising:

a shifting start determining step in which a controller determines whether power-off down-same-shaft shifting is required;
a temporary engaging step in which the controller engages an N-3 stage gear having a gear ratio larger than an N stage gear that is a currently engaged gear;
a first torque switching step in which the controller starts to slip a first clutch engaged with the N-3 stage gear and disengages a second clutch engaged with the N stage gear that is the currently engaged gear, after the temporary engaging step;
a synchronization speed adjusting step in which the controller synchronizes a speed of a power source of a vehicle with a desired input shaft speed obtained by multiplying a current input speed by a gear ratio of an N-2 stage gear that is a desired gear by controlling the power source of the vehicle, disengages the N stage gear, and engages the N-2 stage gear that is the desired gear, with the slip of the first clutch maintained after the first torque switching step;
and
a second torque switching step in which the controller finishes shifting by disengaging the first clutch and engaging the second clutch.

3 more elements

A DCT shifting controller for a vehicle, comprising:

a shifting request determining unit configured to determine whether power-off down-same-shaft shifting is required in a TMED type hybrid vehicle equipped with a DCT;
a shifting instructing unit configured, when the power-off down-same-shaft shifting is required, to control a shifting actuator to engage an N-3 stage gear having a gear ratio larger than an N stage gear that is a currently engaged gear, configured to start to slip a first clutch connected to the N-3 stage gear, and configured to disengage the N stage gear that is the currently engaged gear and engage an N-2 stage gear, with a second clutch, which is connected to the N stage gear that is the currently engaged gear, disengaged;
a clutch instructing unit configured to control the first and second clutches;
and
a driving source instructing unit configured to control driving sources of a vehicle to synchronize a driving source speed with a desired input shaft speed obtained by multiplying a current input shaft speed by a gear ratio of a desired gear, when the second clutch connected to the currently engaged gear is disengaged in accordance with a request for the power-off down-same-shaft shifting.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/081,247Filed 25 Mar 2016
Priority: KR 10-2015-01413048 Oct 2015
Published: 13 Apr 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification38 codes

B60W 20/10
Control systems specially adapted for hybrid vehicles: controlling the power contribution of each of the prime movers to meet required power demand
B60K 6/387
Characterised by the driveline clutches: actuated clutches, i.e. clutches engaged or disengaged by electric, hydraulic or mechanical actuating means
B60K 6/547
Transmission for changing ratio: the transmission being a stepped gearing
B60W 10/02
Conjoint control of vehicle sub-units of different type or different function: including control of driveline clutches