CONTROL DEVICE FOR CONTINUOUSLY VARIABLE AUTOMATIC TRANSMISSION,申请号JP19950115886-传众专利搜索

CONTROL DEVICE FOR CONTINUOUSLY VARIABLE AUTOMATIC TRANSMISSION

申请公布号：JPH08312741(A)

申请号：JP19950115886

申请日期：1995.05.15

申请公布日期：1996.11.26

申请人：

NISSAN MOTOR CO LTD

发明人：SAWADA MAKOTO

分类号：F16H9/00;F16H61/12;(IPC1-7):F16H9/00

主分类号：F16H9/00

摘要：PURPOSE: To prevent the occurrence of the slip of a belt during reacceleration in the middle of deceleration by a method wherein when it is detected that a car speed is below a given value, a maximum oil pressure is fed to a variable pulley on the driven side until a time in which the car speed attains the lowest gear ratio position. CONSTITUTION: A step motor 113 drives a speed change control valve 112 so that a change gear ratio is adjusted to a value corresponding to a signal from a step motor drive circuit 109 and a line pressure fed to a drive pulley cylinder chamber and a driven pulley cylinder chamber is oppositely reciprocally increased and decreased. A line pressure solenoid drive circuit 110 controls the position of the line pressure solenoid 115 of a hydraulic control part 102, and an oil pressure from a hydraulic pump is adjusted to a proper line pressure, to be a target, through a modifier 116 and a regulator 117. The line pressure is fed to a speed change control valve 112 or respective pulleys 16 and 26. Namely, until a time in which a continuously variable transmission is brought into the lowest gear ratio, the maximum pressure is set as a line pressure and when a gear ratio is reduced to the lowest value, a minimum pressure is set as a line pressure.