Patent ID: 8532887
Filing Date: 2013-09-10
Classification: F16D,F16H

Abstract:
1. A hydraulic control apparatus comprising: a fluid transmission apparatus that includes a casing in which a first rotary member and a second rotary member are housed, the fluid transmission apparatus transferring power between the first rotary member and the second rotary member using kinetic energy of oil supplied to the casing; a lockup clutch that is provided in parallel with the fluid transmission apparatus, the lockup clutch being engaged or disengaged in order to control a torque transmitted between the first rotary member and the second rotary member; an engagement hydraulic chamber that engages the lockup clutch when an oil pressure is supplied to the engagement hydraulic chamber; a disengagement hydraulic chamber that disengages the lockup clutch when the oil pressure is supplied to the disengagement hydraulic chamber; a clutch control valve that is provided in a passage supplying the oil pressure into the engagement hydraulic chamber and the disengagement hydraulic chamber, the clutch control valve switching between a first state in which an oil pressure in the engagement hydraulic chamber is increased and a second state in which an oil pressure in the disengagement hydraulic chamber is increased; a signal oil pressure generation apparatus that outputs a signal oil pressure to switch the clutch control valve between the first state and the second state, the signal oil pressure generation apparatus controlling the signal oil pressure by regulating an input oil pressure of oil input into the signal oil pressure generation apparatus; and a switching apparatus that selectively switches between a control in which thermal energy is applied to the oil input into the signal oil pressure generation apparatus when a temperature of the oil input into the signal oil pressure generation apparatus is below a predetermined oil temperature and a control in which thermal energy is not applied to the oil input into the signal oil pressure generation apparatus when the temperature of the oil input into the signal oil pressure generation apparatus equals or exceeds the predetermined oil temperature.