Control apparatus for automatic transmission

Abstract

A control apparatus for an automatic transmission of a vehicle having a forward friction element for engaging or disengaging a turbine shaft with the automatic transmission in a forward running direction and a lock-up clutch for directly transmitting a rotation of an engine to the turbine shaft, comprises an abrupt deceleration control means for disengaging the forward engagement element and the lock-up clutch when an abrupt deceleration of the vehicle is detected, and a restoring means for canceling the abrupt deceleration control means and for restoring the forward friction element to an engagement state when an accelerator pedal is depressed for acceleration.

What is claimed is:  
     
         1 . A control apparatus for an automatic transmission of a vehicle having an engine, a torque converter, a turbine shaft, a forward friction element for engaging or disengaging said turbine shaft with said automatic transmission in a forward running direction and a lock-up clutch for directly transmitting a rotation of said engine to said turbine shaft, comprising: 
 an abrupt deceleration control means for disengaging said forward engagement element and said lock-up clutch when an abrupt deceleration control condition is satisfied; and    a restoring means for canceling said abrupt deceleration control means and for restoring said forward friction element to an engagement state when a restoring condition is satisfied.    
     
     
         2 . The control apparatus according to    claim 1   , wherein 
 said abrupt deceleration control condition includes at least a condition in which said vehicle is braked and a deceleration of said vehicle is larger than a specified value.    
     
     
         3 . The control apparatus according to    claim 1   , wherein 
 said restoring condition includes at least a condition in which said engine is in an acceleration state.