US 9,441,731 B2Granted

Shift control device and shift control method for vehicle

AssigneeToyota Jidosha Kabushiki Kaisha

InventorsSeiji Masunaga, Yoshio Hasegawa, Keisuke Ota

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Abstract

Torque shares that express an exchange of torque are set as a constraint condition of an equation of motion of an automatic transmission, so it is suitable to control an exchange of torque between engagement devices, which is difficult in shift control, and it is possible to solve the equation of motion. In other words, it is possible to handle any shift pattern with the use of a predetermined shift model. Furthermore, at the time of a shift in which two elements are released and two elements are engaged, a first shift and a second shift in each of which one element is released and one element is engaged are carried out, so three control operation amounts are used in each of the first shift and the second shift, with the result that it is possible to solve the equation of motion.

Claims10

Dependent claims

A shift control device for a vehicle including an automatic transmission that has a plurality of engagement devices, the plurality of engagement devices transmitting rotation and torque between an input shaft that receives power from a driving force source and an output shaft that transmits power to a drive wheel, the automatic transmission being shifted by switching between engaged and released states of each of the engagement devices, the shift control device being configured to carry out a shift of the automatic transmission with the use of a predetermined shift model with which control operation amounts are determined to achieve shift target values, the shift control device comprising:

an electronic control unit configured to carry out the shift of the automatic transmission with the use of the shift model by:
(i) setting the shift target values on the basis of two values that are a torque of a rotating member on the output shaft side and a speed variation amount of a rotating member on the input shaft side,
(ii) setting the control operation amounts on the basis of three values that are a torque of the rotating member on the input shaft side, a torque capacity of an engaged one of the engagement devices during the shift and a torque capacity of a released one of the engagement devices during the shift, and
(iii) setting torque shares of a transmission torque between the engaged one of the engagement devices and the released one of the engagement devices during the shift,
the electronic control unit being configured to, at the time of a shift between gear speeds, which is carried out by releasing two of the engagement devices and engaging other two of the engagement devices, carry out the shift by carrying out a first shift and a second shift through an intermediate gear speed, the electronic control unit being configured to carry out the first shift from a pre-shift gear speed to the intermediate gear speed by releasing one of the engagement devices and engaging another one of the engagement devices and to carry out the second shift from the intermediate gear speed to a post-shift gear speed by releasing one of the engagement devices and engaging another one of the engagement devices.

2 more elements

A shift control method for a vehicle including an electronic control unit and an automatic transmission that has a plurality of engagement devices, the plurality of engagement devices transmitting rotation and torque between an input shaft that receives power from a driving force source and an output shaft that transmits power to a drive wheel, the automatic transmission being shifted by switching between engaged and released states of each of the engagement devices,

the shift control method, executed by the electronic control unit, comprising:
carrying out a shift of the automatic transmission with the use of a predetermined shift model with which control operation amounts are determined to achieve shift target values;
carrying out the shift of the automatic transmission with the use of the shift model by:
(i) setting the shift target values on the basis of two values that are a torque of a rotating member on the output shaft side and a speed variation amount of a rotating member on the input shaft side,
(ii) setting the control operation amounts on the basis of three values that are a torque of the rotating member on the input shaft side, a torque capacity of an engaged one of the engagement devices during the shift and a torque capacity of a released one of the engagement devices during the shift, and
(iii) setting torque shares of a transmission torque between the engaged one of the engagement devices and the released one of the engagement devices during the shift;
and
at the time of a shift between gear speeds, which is carried out by releasing two of the engagement devices and engaging other two of the engagement devices, carrying out the shift by carrying out a first shift and a second shift through an intermediate gear speed, the first shift being carried out from a pre-shift gear speed to the intermediate gear speed by releasing one of the engagement devices and engaging another one of the engagement devices, the second shift being carried out from the intermediate gear speed to a post-shift gear speed by releasing one of the engagement devices and engaging another one of the engagement devices.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/432,285Filed 3 Jan 2014
Priority: JP 2013-00780118 Jan 2013
Published: US 2015/0260280 A117 Sep 2015
Granted: 13 Sep 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F16H 61/0213
For gearshift control, e.g. control functions for performing shifting or generation of shift signal: characterised by the method for generating…
B60W 10/06
Including control of propulsion units: including control of combustion engines
B60W 10/11
Including control of change-speed gearings: stepped gearings
F16H 61/0437
Smoothing ratio shift: by using electrical signals