Patent ID: 9062764
Filing Date: 2015-06-23
Classification: F16H

Abstract:
1. A clutch control system for a transmission having at least a first hydraulic clutch and a second hydraulic clutch, the clutch control system comprising: a control section configured to control a supply of hydraulic pressure to each of the first and second hydraulic clutches switched from a disengagement state to an engagement state upon receiving a predetermined hydraulic pressure generated by a single hydraulic pump; a transmission in which a shifting operation to an adjacent gear step occurs by operation of switching the engagement state from the first hydraulic clutch to the second hydraulic clutch; a conduit connected to the single hydraulic pump, the conduit having a first branch for supplying oil to the first hydraulic clutch and a second branch for supplying oil to the second hydraulic clutch; and pressure-increasing means adapted to use engine suction pressure for temporarily increasing the hydraulic pressure supplied to each of the hydraulic clutches; wherein the control section discontinues the switching operation of the hydraulic clutches if an elapsed time from a start of the switching operation reaches a predetermined time and the input-output speed ratio falls within a predetermined range corresponding to a gear step before the shifting operation, wherein the pressure increasing means is connected to each of the first and second branches of the conduit, and, under a specific condition, is adapted to function as a booster for temporarily supplying high-hydraulic pressure to each of the first and second hydraulic clutches, wherein the predetermined range corresponding to a gear step before the shifting operation is not less than a determined lower limit of after-shifting gear steps YG(n+1)L and not greater than a determined upper limit of after-shifting gear steps YG(n+1)H.