Valve characteristic changing apparatus for internal combustion engine

Abstract

A value characteristic changing apparatus for an internal combustion engine according to the invention is provided with an intake-side variable valve timing mechanism that changes a valve timing of an intake valve of an internal combustion engine, and an exhaust-side variable valve timing mechanism that changes a valve timing of an exhaust valve. The intake-side variable valve mechanism is a mechanism that uses an storage battery as a power source; the exhaust-side variable valve timing mechanism is a mechanism that uses a hydraulic pump of an engine driving type as a power source.

1. A valve characteristic changing apparatus for an internal combustion engine comprising:
 a first mechanism group which include at least one first varying mechanism that changes a valve characteristic of at least one first engine valve;  
 a second mechanism group which include at least one second varying mechanism that changes a valve characteristic of at least one second engine valve;  
 a first power source group including at least one first power source for the first mechanism group; and  
 a second power source group including at least one second power source for the second mechanism group;  
 wherein a kind of the at least one first power source is different from a kind of the at least one second power source,  
 the at least one first varying mechanism changes both an opening timing and a closing timing of the at least one first engine valve as the valve characteristic of the at least one first engine valve, and  
 the at least one second varying mechanism changes both an opening timing and a closing timing of the at least one second engine valve as the valve characteristic of the at least one second engine valve, and  
   the valve characteristic of the at least one first engine valve changed by the at least one first varying mechanism is the same as the valve characteristic of the at least one second engine valve varied by the second varying mechanism .  
 
     
     
       2. The valve characteristic changing apparatus according to  claim 1 , wherein
 the first varying  mechanism group is one varying mechanism, and  
 the second varying  mechanism group is one varying mechanism.  
 
     
     
       3. The valve characteristic changing apparatus according to  claim 1 , wherein
 the at least one first engine valve is an intake valve,  
 the at least one second engine valve is an exhaust valve,  
 the at least one first varying mechanism is an intake-side varying mechanism that changes a valve characteristic of the intake valve, and  
 the at least one second varying mechanism is an exhaust-side varying mechanism that changes a valve characteristic of the exhaust valve.  
 
     
     
       4. The valve characteristic changing apparatus according to  claim 3 , wherein the first power source group generates power which is not dependent on an engine speed. 
     
     
       5. The valve characteristic changing apparatus according to  claim 3 , wherein a maximum power of the first power source group is not dependent on an engine speed. 
     
     
       6. The valve characteristic changing apparatus according to  claim 4 , wherein
 the intake-side varying mechanism has an electric motor that changes the valve characteristic, and  
 the first power source group is a storage battery that supplies electric power to the electric motor.  
 
     
     
       7. The valve characteristic changing apparatus according to  claim 3 , wherein the second power source group is a hydraulic pump that is driven by an engine output. 
     
     
       8. The valve characteristic changing apparatus according to  claim 7 , wherein the hydraulic pump delivers, under pressure, lubricating oil to an engine lubricating system of the internal combustion engine. 
     
     
       9. The valve characteristic changing apparatus according to  claim 1 , wherein the first power source group is one power source. 
     
     
       10. The valve characteristic changing apparatus according to  claim 1 , wherein the second power source group is one power source. 
     
     
       11. A valve characteristic changing apparatus for an internal combustion engine comprising:
 a first mechanism group which include at least one first varying mechanism that changes a valve characteristic of at least one first engine valve;  
 a second mechanism group which include at least one second varying mechanism that changes a valve characteristic of at least one second engine valve;  
 a first power source group which includes at least one first power source that supplies power to the first mechanism group and does not supply power to the second mechanism group; and  
 a second power source group which includes at least one second power source that supplies power to the second mechanism group and does not supply power to the first mechanism group; wherein  
 a kind of the at least one first power source is different from a kind of the at least one second power source,  
 the at least one first varying mechanism changes both an opening timing and a closing timing of the at least one first engine valve as the valve characteristic of the at least one first engine valve, and  
 the at least one second varying mechanism changes both an opening timing and a closing timing of the at least one second engine valve as the valve characteristic of the at least one second engine valve, and  
   the valve characteristic of the at least one first engine valve changed by the at least one first varying mechanism is the same as the valve characteristic of the at least one second engine valve varied by the second varying mechanism .  
 
     
     
       12. The valve characteristic changing apparatus according to  claim 1 , wherein the at least one first power source is for the at least one first varying mechanism that requires good responsiveness when the valve characteristic of the at least one first engine valve is changed in a low engine speed region, and the at least one second power source is for the at least one second varying mechanism that requires good responsiveness when the valve characteristic of the at least one second engine valve is changed in a high engine speed region. 
     
     
       13. The valve characteristic changing apparatus according to  claim 11 , wherein the at least one first power source is for the at least one first varying mechanism that requires good responsiveness when the valve characteristic of the at least one first engine valve is changed in a low engine speed region, and the at least one second power source is for the at least one second varying mechanism that requires good responsiveness when the valve characteristic of the at least one second engine valve is changed in a high engine speed region.