Throttle valve control apparatus of internal combustion engine and automobile using the same

Abstract

The invention provides a throttle valve control apparatus provided with a throttle sensor which is in trouble at a low possibility and has a long service life, whereby an accurate output of a throttle opening degree can be obtained. The throttle valve control apparatus of an internal combustion engine ahs a throttle opening degree sensor constituted by a non-contact sensor using hole elements.

1 . A throttle valve control apparatus of an internal combustion engine comprising: 
 a throttle valve axis;    a final gear fixed to said throttle valve axis and transmitting a driving force of a motor to said throttle valve axis;    a throttle body supporting said throttle valve axis;    a throttle sensor detecting a rotation angle of said throttle valve axis; and    a cover attached to said throttle body and covering said final gear;    wherein said throttle sensor is of a magnetic type having a magnet and a Hall element detecting a change of a magnetic flux of said magnet, and    wherein said magnet and said Hall element are arranged between a surface in a side in which a gear fixed to said throttle valve axis faces to said throttle body, and an inner surface of said cover.    
   
   
       2 . A throttle valve control apparatus of an internal combustion engine as claimed in  claim 1 , wherein said magnet is attached to said throttle valve axis, and said Hall element is attached to said cover.  
   
   
       3 . A throttle valve control apparatus of an internal combustion engine as claimed in  claim 1 , wherein an output of said Hall element forms a function of an opening degree of said throttle valve.  
   
   
       4 . A throttle valve control apparatus of an internal combustion engine as claimed in  claim 1 , wherein a command value of said motor is regulated on the basis of an electric signal output by said throttle sensor.  
   
   
       5 . A throttle valve control apparatus of an internal combustion engine as claimed in  claim 1 , wherein said gear is constituted by a metal plate fixed to said throttle valve axis, and a synthetic resin portion forming teeth, and 
 wherein said synthetic resin portion is integrally formed with said metal plate by insert molding said metal plate.    
   
   
       6 . a throttle valve control apparatus of an internal combustion engine as claimed in  claim 1 , wherein a rotation axis of said motor is arranged in parallel to said throttle valve axis, 
 wherein a rotation of the rotation axis of said motor is transmitted to said throttle valve axis via a reduction gear, and    wherein a support axis of an intermediate gear positioned at the midpoint of a torque transmission path between the rotation axis of said motor and said throttle valve axis.    
   
   
       7 . A throttle valve control apparatus of an internal combustion engine as claimed in  claim 1 , wherein said Hall element, and a signal processing circuit converting an output of said Hall element into a predetermined electric signal are attached to said cover.  
   
   
       8 . A throttle valve control apparatus of an internal combustion engine as claimed in  claim 1 , wherein a spring holding said magnet at a predetermined opening degree position at a time of shutting off the current of said motor is installed to a periphery of said throttle valve shaft.  
   
   
       9 . A throttle valve control apparatus of an internal combustion engine as claimed in  claim 1 , wherein said Hall element is constituted by two elements arranged under a magnetic effect of said magnet and backed up mutually.