Electric regenerative turbocharger

Abstract

An electric regenerative turbocharger includes: an exhaust gas energy regenerative unit placed in an exhaust gas path and having a power generator; and a supercharging unit placed in an intake air path of an internal combustion engine and having an electric motor, and the electric motor includes a first electricity storage unit which is driven independently from the power generator and which is electrically connected to the exhaust gas energy regenerative unit and the supercharging unit, a second electricity storage unit which is connected to the first electricity storage unit and which supplies electricity to an electric component, and an electricity converting unit placed between the first electricity storage unit and the second electricity storage unit.

What is claimed is: 
     
         1 . An electric regenerative turbocharger comprising:
 an exhaust gas energy regenerative unit placed in an exhaust gas path and having a power generator; and   a supercharging unit placed in an intake air path of an internal combustion engine and having an electric motor,   wherein the electric motor includes   a first electricity storage unit which is driven independently from the power generator and which is electrically connected to the exhaust gas energy regenerative unit and the supercharging unit,   a second electricity storage unit which is connected to the first electricity storage unit and which supplies electricity to an electric component, and   an electricity converting unit placed between the first electricity storage unit and the second electricity storage unit.   
     
     
         2 . The electric regenerative turbocharger according to  claim 1 , wherein
 the electric motor is driven independently from the power generator, the electric motor can normally and reversely be driven, and the electric motor adjusts intake air pressure and a flow rate of the internal combustion engine.   
     
     
         3 . The electric regenerative turbocharger according to  claim 2 , wherein
 a thermoelectric conversion unit is placed downstream of the exhaust gas energy regenerative unit which is placed in an exhaust gas path of the internal combustion engine.   
     
     
         4 . The electric regenerative turbocharger according to  claim 1 , wherein
 the power generator driven by the exhaust gas energy regenerative unit is a power generator which controls field current, the internal combustion engine includes an exhaust gas recirculation path, and when the electric motor and the supercharging unit are controlled to reduce a supercharging amount, the field current is increased when output of the electric motor is greater than power generation output of the power generation based on a magnitude relation between the output of the electric motor which drives the supercharging unit and the output of the power generator.   
     
     
         5 . The electric regenerative turbocharger according to  claims 1 , wherein
 the power generator driven by the exhaust gas energy regenerative unit is a permanent magnet power generator, the exhaust gas energy regenerative unit includes a bypass path which bypasses an upstream side and a downstream side of the exhaust gas energy regenerative unit, the bypass path includes an opening degree adjusting mechanism capable of controlling an exhaust gas flow rate toward the exhaust gas energy regenerative unit by adjusting an opening direction of the bypass path, and the opening degree adjusting mechanism is controlled into its opening degree based on generated voltage of the power generator.   
     
     
         6 . The electric regenerative turbocharger according to  claim 3 , further comprising a measuring or estimating unit of back pressure of the internal combustion engine, wherein
 output of the power generator is reduced based on a measurement or estimation result of the back pressure of the internal combustion engine and an electric charging state of the first electricity storage unit.   
     
     
         7 . The electric regenerative turbocharger according to  claim 2 , wherein
 the supercharging unit and the electric motor are reversely driven immediately before the internal combustion engine stops.