Control circuit for a variable vane oil pump

Abstract

A control circuit for a variable vane oil pump of an automatic transmission vehicle may include the variable vane oil pump supplying a working fluid for controlling the automatic transmission, a regulator valve mounted at a hydraulic line fluid-connected to the variable vane oil pump, and a torque converter control valve fluid-connected to the regulator valve for controlling the working fluid supplied from the regulator valve to have a pressure required in a torque converter, wherein the variable vane oil pump may be controlled by an amount of the working fluid discharged from the torque converter control valve.

What is claimed is: 
     
         1 . A control circuit for a variable vane oil pump of an automatic transmission vehicle, comprising:
 the variable vane oil pump supplying a working fluid for controlling the automatic transmission;   a regulator valve mounted at a hydraulic line fluid-connected to the variable vane oil pump; and   a torque converter control valve fluid-connected to the regulator valve for controlling the working fluid supplied from the regulator valve to have a pressure required in a torque converter,   wherein the variable vane oil pump is controlled by an amount of the working fluid discharged from the torque converter control valve.   
     
     
         2 . The control circuit of  claim 1 , wherein an exhaust line of the torque converter control valve is fluid-connected to a control line of the variable vane oil pump such that the variable vane oil pump is controlled by the amount of the working fluid discharged from the torque converter control valve. 
     
     
         3 . The control circuit of  claim 2 , wherein the working fluid discharged from an outflow line fluid-connected to the regulator valve flows to an inflow line connected to the variable vane oil pump. 
     
     
         4 . The control circuit of  claim 3 , wherein the working fluid of the torque converter flows into an oil filter and an oil pan through a first pipe line branched from the exhaust line, and enters the variable vane oil pump through a second pipe line after passing through the oil filter and the oil pan. 
     
     
         5 . The control circuit of  claim 4 , wherein the second pipe line is fluid-connected to the inflow line. 
     
     
         6 . The control circuit of  claim 4 , wherein an orifice is formed at each of the control line and the first pipe line. 
     
     
         7 . The control circuit of  claim 3 , wherein the exhaust line of the torque converter control valve and the outflow line of the regulator valve are fluid-connected with each other to a third pipe line, and the third pipe line is connected to the control line of the variable vane oil pump. 
     
     
         8 . The control circuit of  claim 7 , wherein the working fluid of the torque converter flows into the oil filter and the oil pan through a fourth pipe line branched from the third pipe line, and enters the variable vane oil pump through a fifth pipe line after passing through the oil filter and the oil pan. 
     
     
         9 . The control circuit of  claim 8 , wherein the fifth pipe line is fluid-connected to the inflow line. 
     
     
         10 . The control circuit of  claim 8 , wherein an orifice is formed at each of the fourth pipe line and the control line.