Control apparatus and control method for internal combustion engine

Abstract

An ECU executes a program including the steps of detecting the crank angle, advancing, at a crank angle at which the cam torque is exerted in the direction opposite to the rotational direction of an intake camshaft, the phase in which the intake valve is closed and retarding, at a crank angle at which the cam torque is exerted in the rotational direction of the intake camshaft, the phase in which the intake valve is closed.

1 . A control apparatus for an internal combustion engine including a camshaft driving a valve and a change mechanism changing a phase in which said valve is closed, 
 said control apparatus comprising an operation unit, and    said operation unit controlling said change mechanism in a manner that the phase is advanced in a case where a torque exerted on said camshaft by rotation of said camshaft acts in a direction opposite to a rotational direction of said camshaft, and controlling said change mechanism in a manner that the phase is retarded in a case where said torque acts in the rotational direction of said camshaft.    
   
   
       2 . The control apparatus for the internal combustion engine according to  claim 1 , wherein 
 said operation unit controls said change mechanism in a manner that the phase is advanced to a greater extent as the torque acting in the direction opposite to the rotational direction of said camshaft is larger, and controls said change mechanism in a manner that the phase is retarded to a greater extent as the torque acting in the rotational direction of said camshaft is larger.    
   
   
       3 . The control apparatus for the internal combustion engine according to  claim 1 , wherein 
 said operation unit controls said change mechanism in a manner that the phase is advanced to a greater extent as said camshaft has a higher rotational speed, and controls said change mechanism in a manner that the phase is retarded to a greater extent as said camshaft has a higher rotational speed.    
   
   
       4 . The control apparatus for the internal combustion engine according to  claim 1 , wherein 
 said operation unit controls said change mechanism in a manner that the phase is advanced to a greater extent as said internal combustion engine has a higher load, and controls said change mechanism in a manner that the phase is retarded to a greater extent as said internal combustion engine has a higher load.    
   
   
       5 . A control method for an internal combustion engine including a camshaft driving a valve and a change mechanism changing a phase in which said valve is closed, comprising the steps of: 
 controlling said change mechanism in a manner that the phase is advanced in a case where a torque exerted on said camshaft by rotation of said camshaft acts in a direction opposite to a rotational direction of said camshaft; and    controlling said change mechanism in a manner that the phase is retarded in a case where said torque acts in the rotational direction of said camshaft.    
   
   
       6 . The control method for the internal combustion engine according to  claim 5 , wherein 
 said step of controlling said change mechanism in the manner that the phase is advanced includes the step of controlling said change mechanism in a manner that the phase is advanced to a greater extent as the torque acting in the direction opposite to the rotational direction of said camshaft is larger, and    said step of controlling said change mechanism in the manner that the phase is retarded includes the step of controlling said change mechanism in a manner that the phase is retarded to a greater extent as the torque acting in the rotational direction of said camshaft is larger.    
   
   
       7 . The control method for the internal combustion engine according to  claim 5 , wherein 
 said step of controlling said change mechanism in the manner that the phase is advanced includes the step of controlling said change mechanism in a manner that the phase is advanced to a greater extent as said camshaft has a higher rotational speed, and    said step of controlling said change mechanism in the manner that the phase is retarded includes the step of controlling said change mechanism in a manner that the phase is retarded to a greater extent as said camshaft has a higher rotational speed.    
   
   
       8 . The control method for the internal combustion engine according to  claim 5 , wherein 
 said step of controlling said change mechanism in the manner that the phase is advanced includes the step of controlling said change mechanism in a manner that the phase is advanced to a greater extent as said internal combustion engine has a higher load, and    said step of controlling said change mechanism in the manner that the phase is retarded includes the step of controlling said change mechanism in a manner that the phase is retarded to a greater extent as said internal combustion engine has a higher load.    
   
   
       9 . A control apparatus for an internal combustion engine including a camshaft driving a valve and a change mechanism changing a phase in which said valve is closed, said control apparatus comprising: 
 first control means for controlling said change mechanism in a manner that the phase is advanced in a case where a torque exerted on said camshaft by rotation of said camshaft acts in a direction opposite to a rotational direction of said camshaft; and    second control means for controlling said change mechanism in a manner that the phase is retarded in a case where said torque acts in the rotational direction of said camshaft.    
   
   
       10 . The control apparatus for the internal combustion engine according to  claim 9 , wherein 
 said first control means includes means for controlling said change mechanism in a manner that the phase is advanced to a greater extent as the torque acting in the direction opposite to the rotational direction of said camshaft is larger, and    said second control means includes means for controlling said change mechanism in a manner that the phase is retarded to a greater extent as the torque acting in the rotational direction of said camshaft is larger.    
   
   
       11 . The control apparatus for the internal combustion engine according to  claim 9 , wherein 
 said first control means includes means for controlling said change mechanism in a manner that the phase is advanced to a greater extent as said camshaft has a higher rotational speed, and    said second control means includes means for controlling said change mechanism in a manner that the phase is retarded to a greater extent as said camshaft has a higher rotational speed.    
   
   
       12 . The control apparatus for the internal combustion engine according to  claim 9 , wherein 
 said first control means includes means for controlling said change mechanism in a manner that the phase is advanced to a greater extent as said internal combustion engine has a higher load, and    said second control means includes means for controlling said change mechanism in a manner that the phase is retarded to a greater extent as said internal combustion engine has a higher load.