Control apparatus and control method for automatic transmission

#The disclosure of Japanese Patent Application No. 2015-204053 filed on Oct. 15, 2015 including the specification, drawings and abstract is incorporated herein by reference in its entirety.

#1. Technical Field

#The disclosure relates to a control apparatus and a control method for an automate transmission in which a plurality of gear stages having different gear ratios are selectively formed.

#Features, advantages, and technical and industrial significance of an exemplary embodiment will be described below with reference to the accompanying drawings, in which like numerals denote like elements, and wherein:

#FIG. 1 is a view illustrating the general configuration of a vehicle to which the disclosure is applied and illustrating control functions and the essential part of a control system for various kinds of control in the vehicle;

#FIG. 2 is a skeleton view illustrating examples of a torque converter and an automatic transmission;

#The embodiment of the disclosure will be described hereinafter in detail with reference to the drawings.

#FIG. 1 is a view illustrating the general configuration of a vehicle 10 to which the disclosure is applied, and illustrating the essential part of a control system for various kinds of control in the vehicle 10. In FIG. 1, the vehicle 10 is equipped with an engine 12, driving wheels 14, and a power transmission device 16 that is provided in a power transmission path between the engine 12 and the driving, wheels 14. The power transmission device 16 is equipped with a torque converter 20 and an automatic transmission 22 that are disposed in a case 18 as a non-rotary member that is attached to a vehicle body, a propeller shaft 26 that is coupled to a transmission output shaft 24 as an output rotary member of the automatic transmission 22, a differential gear mechanism (a differential gear) 28 that is coupled to the propeller shaft 26, a pair of axles 30 that are coupled to the differential near mechanism 28, and the like. In the power transmission device 16, a power output from the engine 12 (which is synonymous with a torque and a force when no distinction is made therebetween in particular) is transmitted to the driving wheels 14 sequentially via the torque converter 20, the automatic transmission 22, the propeller shaft 26, the differential gear mechanism 28, the axles 30 and the like.

#The engine 12 is a driving force source of the vehicle 10, and is a known internal combustion engine such as a gasoline engine, a diesel engine or the like. Operating states of this engine 12 such as an intake air amount, a fuel supply amount, an ignition timing and the like are controlled by an electronic control unit 60 that will be described later. Thus, an engine torque Te of the engine 12 is controlled.