A pressure control system for a lock-up clutch includes a variable flow restriction orifice disposed in a lubricating circuit. The variable flow restriction orifice is operated depending upon a discharge rate of an oil pump so that working fluid flow through the lubricating circuit is restricted when the discharge rate of the oil pump is smaller than a predetermined value.
A pressure control system for a lock-up clutch of a lock-up type automotive automatic power transmission, comprising: a torque converter associated with an input element inputting driving torque from a prime mover and an output element for outputting driving torque, said torque converter including a lock-up clutch for establishing and releasing direct and mechanical connection between said input and output elements; a lock-up control fluid circuit connected to a pressurized fluid source which has a variable discharge rate depending upon an engine revolut...
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