US 2003/0233185 A1 · Gear-shift control apparatus for automatic transmission and gear-shift control method

Abstract

If oil temperature is equal to or higher than a predetermined temperature and if accelerator opening change rate is equal to or higher than a predetermined change rate upon detection of a downshift instruction, an ECT-ECU sets modes corresponding to conditions for determination period calculation processings, hydraulic-pressure temporal change rate calculation processings, and torque adjustment amount calculation processings, respectively. By performing downshift on the basis of a determination period, a hydraulic-pressure temporal change rate, and a torque adjustment amount corresponding to a set mode, the ECT-ECU improves gear-shift responsive characteristics and restrains the occurrence of a gear-shift shock.

Claims24

Dependent claims

A gear-shift control apparatus that controls an automatic transmission installed in a vehicle, comprising:

a detector for detecting information regarding the automatic transmission;
and
a controller that calculates an engagement processing condition relating to a processing that is performed after a command value of hydraulic pressure for engaging a first friction engagement element on the basis of an instruction to the automatic transmission is output and before a gear-shift stage based on the instruction is established if the information satisfies a predetermined condition, that calculates a criterion period from a timing when the gear-shift stage is established to a timing when it is determined that a gear shift has been completed if the information satisfies a predetermined condition, that determines that a processing based on the instruction has been completed if a predetermined reference period elapses after establishment of the gear-shift stage, and that sets the criterion period as the reference period.

A gear-shift control apparatus that controls an automatic transmission installed in a vehicle, comprising:

a detector for detecting information regarding the automatic transmission;
and
a controller that controls a power source of the vehicle so as to control input torque of the automatic transmission, that calculates an engagement processing condition relating to a processing that is performed after a command value of hydraulic pressure for engaging a friction engagement element on the basis of an instruction to the automatic transmission is output and before a gear-shift stage based on the instruction is established if the information satisfies a predetermined condition, and that outputs a first instruction for adjusting the input torque on the basis of a first adjustment amount calculated in advance if the information satisfies the predetermined condition.

A gear-shift control method for controlling an automatic transmission installed in a vehicle, comprising

a detection step of detecting information regarding the automatic transmission;
a first condition calculation step of calculating an engagement processing condition relating to a processing that is performed after a hydraulic-pressure command value for engaging a first friction engagement element is output on the basis of an instruction to the automatic transmission and before a gear-shift stage based on the instruction is established if the information satisfies a predetermined condition;
a period calculation step of calculating a criterion period from a timing when the gear-shift stage is established to a timing when it is determined that a gear shift has been completed if the information satisfies the predetermined condition;
a determination step of determining that a processing based on the instruction has been completed if a predetermined reference period elapses after establishment of the gear-shift stage;
and
a set step of setting the criterion period as the reference period.

3 more elements

A gear-shift control method for controlling an automatic transmission installed in a vehicle, comprising

a detection step of detecting information regarding the automatic transmission;
a condition calculation step of calculating an engagement processing condition relating to a processing that is performed after a hydraulic-pressure command value for engaging a friction engagement element on the basis of an instruction to the automatic transmission is output and before a gear-shift stage based on the instruction is established if the information satisfies a predetermined condition;
and
a first output step of outputting a first instruction for adjusting an input torque of the automatic transmission on the basis of a first adjustment amount calculated in advance if the information satisfies the predetermined condition.

1 more element

Dependencies are inferred from the claim text.

Gear-shift control apparatus for automatic transmission and gear-shift control method

Life of this patent

Gear-shift control apparatus for automatic transmission and gear-shift control method

Life of this patent

Abstract

Claims24