Device and method for controlling oil pressure of vehicle

Abstract

An assessment of 'base neutral ' is made when the difference between a command oil pressure and the actual oil pressure of a hydraulic clutch is within a prescribed microvalue range, and when the difference is outside of the microvalue range, an assessment of 'raise base' is made if the command oil pressure is greater than the actual oil pressure, and an assessment of 'lower base' is made if the command oil pressure is less than the actual oil pressure. An assessment of 'raise sub' is made when the command torque processed using a low-pass filter tends to be positive for at least a prescribed time, an assessment of 'lower sub' is made when the command torque tends to be negative for at least a prescribed time, and the tendency of the command torque to increase or decrease is assessed. When the assessment is 'raise base', the command oil pressure corresponding to the command torque is determined using a pressurization characteristic in hysteresis characteristics, and when the assessment is 'lower base ', the command oil pressure is determined using a depressurization characteristic. When the assessment is 'base neutral', the command oil pressure is determined using the pressurization characteristic when the assessment of 'raise sub' has been made, and the depressurization characteristic is used when the assessment of 'lower sub' has been made.

Description

Technical field [0001] The present invention relates to a hydraulic control device and method for a vehicle, and more particularly to a hydraulic control device and method that performs control that takes into account the hysteresis characteristics of hydraulic clutches during pressurization and decompression. Background technique [0002] Patent Document 1 discloses that the hydraulic control device has a full hysteresis characteristic as a basic map. The full hysteresis characteristic represents the hysteresis to the hydraulic pressure change characteristic composed of the pressure increase characteristic and the pressure reduction characteristic. When the small loop of turning back at the midway position within the characteristic range continues, for each small loop from the past to the current time, multiple reduced maps are generated after the base map is reduced corresponding to the turning position, and the current position is the same The lag hydraulic pressure correction...

AI Technical Summary

Problems solved by technology

In such a structure, a simple structure can be formed, but since the switching of the hysteresis characteristic at the time of pressurization and decompression is performed only by the required driving force (command torque), sufficient accuracy cannot be obtained.

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