Control apparatus for automatic transmission and control method for automatic transmission
a control apparatus and automatic transmission technology, applied in mechanical apparatus, digital data processing details, instruments, etc., can solve the problems of automatic transmissions prone to increase calorific value, frictional engagement elements seizing (burning) and other problems
Active Publication Date: 2015-04-23
HONDA MOTOR CO LTD
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Benefits of technology
The present invention relates to a control apparatus for an automatic transmission that selectively engages a plurality of frictional engaging elements for shift control. The control apparatus includes a shift instruction section, temperature calculator, engageability determiner, engagement delay section, load calculator, cumulative load calculator, and threshold temperature changer. The shift instruction section issues a shift instruction. The temperature calculator calculates the temperature of the frictional engaging elements. The engageability determiner determines whether the frictional engaging elements are engageable or not based on the temperature comparison. The engagement delay section delays engagement of the frictional engaging elements until they are determined to be engageable. The load calculator calculates the load input to each frictional engaging element when the automatic transmission performs shift operation. The cumulative load calculator calculates the cumulative load of the frictional engaging elements. The threshold temperature changer changes the predetermined threshold temperature when the cumulative load reaches a predetermined value. The technical effect of this invention is to improve the control accuracy of the automatic transmission in shifting gears, especially in high-load driving conditions.
Problems solved by technology
Accordingly, the automatic transmissions tend to suffer from an increased calorific value in engaging the frictional engaging elements during shifting.
The increased calorific value of the frictional engaging elements might cause seizing (burning) of the frictional engaging elements and other problems.
Method used
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[0021]The embodiments will now be described with reference to the accompanying drawings, wherein like reference numerals designate corresponding or identical elements throughout the various drawings.
[0022]An embodiment of the present application will be described in detail with reference to the drawings. FIG. 1 is a block diagram schematically illustrating a power transmission system and a control system of a vehicle including a control device for an automatic transmission according to an embodiment of the present application. The power transmission system of the vehicle includes: an engine 1 serving as a power source; a torque converter 2 serving as a fluid coupling for transmitting a rotation output of the engine 1 to a shift gear mechanism 3; the shift gear mechanism 3 that receives the rotation output from the torque converter 2, changes the speed of the rotation output with a predetermined speed ratio, and outputs the resulting rotation output; and a differential gear mechanism...
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A control apparatus for an automatic transmission that selectively engages a plurality of frictional engaging elements for shift control includes a shift instruction device, a temperature calculator, an engageability determiner, an engagement delay device, a load calculator, a cumulative load calculator, and a threshold temperature changer. The engageability determiner is configured to determine whether at least one of the plurality of frictional engaging elements is engageable or not based on a comparison between a temperature of the at least one of the plurality of frictional engaging elements calculated by the temperature calculator and a predetermined threshold temperature in a case where the shift instruction device outputs a shift instruction. The threshold temperature changer is configured to change the predetermined threshold temperature in a case where a cumulative load calculated by the cumulative load calculator reaches a value greater than or equal to a predetermined value.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority under 35 U.S.C. §119 to Japanese Patent Application No. 2013-220128, filed Oct. 23, 2013, entitled “Control Apparatus for Automatic Transmission.” The contents of this application are incorporated herein by reference in their entirety.BACKGROUND[0002]1. Field[0003]The present disclosure relates to a control apparatus for an automatic transmission and a control method for an automatic transmission.[0004]2. Description of the Related Art[0005]Automatic transmissions that automatically perform shifting by switching power transmission paths each composed of a plurality of shift gear trains through selective engagement of frictional engaging elements, such as shift clutches, have been widely employed for vehicles. In recent automatic transmissions, in order to increase the power of engines and the shifting performance of the automatic transmissions, for example, shift operation (engagement of frictional ...
Claims
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Login to View More IPC IPC(8): F16H61/02F16H61/68
CPCF16H61/68F16H61/0213F16H59/14F16H59/72
Inventor SATOYOSHI, TAKASHI
Owner HONDA MOTOR CO LTD