초록 ▼

A turbocharger drive system associated with an internal combustion engine includes a plurality of turbochargers drivable by exhaust gases from the engine, a plurality of rotary electric machines mounted on the rotatable shafts, respectively, of the turbochargers and operable as electric motors or ge

A turbocharger drive system associated with an internal combustion engine includes a plurality of turbochargers drivable by exhaust gases from the engine, a plurality of rotary electric machines mounted on the rotatable shafts, respectively, of the turbochargers and operable as electric motors or generators, and a single rotary electric machine coupled to the rotatable shaft of the engine. When the engine rotates at a low speed and under a high load, the rotary electric machine coupled to the engine shaft operates as an electric generator to generate electric power to drive the rotary electric machines mounted on the turbocharger shafts as electric motors, so that the boost pressure is increased to increase the output power of the engine. Since the multistage turbochargers are power-assisted by the respective rotary electric machines, the boost pressure builds up sharply. When the engine rotates at a high speed, the rotary electric machines combined with the turbochargers generate electric power to drive the rotary electric machine coupled to the engine shaft as an electric motor, thus feeding exhaust energy back to the engine output power.

대표청구항 ▼

A turbocharger drive system combined with an internal combustion engine, comprising: means for detecting the load on the internal combustion engine; means for detecting the rotational speed of the internal combustion engine; means for detecting the boost pressure of the internal combustion engine; m

A turbocharger drive system combined with an internal combustion engine, comprising: means for detecting the load on the internal combustion engine; means for detecting the rotational speed of the internal combustion engine; means for detecting the boost pressure of the internal combustion engine; means for storing the boost pressure corresponding to the detected load on the internal combustion engine; a plurality of turbochargers having series-connected exhaust turbines, respectively, and series-connected compressors, respectively; a plurality of rotary electric machines mounted respectively on rotatable shafts of said turbochargers; a single rotary electric machine drivable by an output shaft of the internal combustion engine; means for driving said single rotary electric machine as an electric generator; means for calculating the difference between the boost pressure corresponding to the detected load and the detected boost pressure; means for driving said plurality of rotary electric machines as electric motors successively from the rotary electric machine combined with the turbocharger closest to the internal combustion engine as said difference increases when said detected boost pressure is lower than said boost pressure corresponding to said detected load; and means for supplying electric power from said electric generator to said motors.