Turbocharging system of internal combustion engine

Abstract

A turbocharging system equipped with a pressure wave supercharger (20) which supercharges an internal combustion engine (1) by raising the pressure of gas in a cell (23) with the pressure wave of exhaust gas introduced from an exhaust gas introduction port (26) to the cell (23) and discharging the gas having raised pressure from intake gas discharge ports (28b, 25) to an intake gas passage (3) is further provided with a first motor (29) which rotary drives the rotor (22) of the pressure wave supercharger (20), a valve plate (28) which can change the position of the intake gas discharge port (28b) with respect to the exhaust gas introduction port (26), and a second motor (30). Operation of the first motor (29) and the second motor (30) is controlled, respectively, so that the number of revolutions of the rotor (22) and the position of the intake gas discharge ports (28b) with respect to the exhaust gas introduction port (26) are changed based on the flow rate of exhaust gas to be recirculated from the exhaust gas passage (4) to the intake gas passage (3).

Description

technical field [0001] The present invention relates to a supercharging system of an internal combustion engine provided with a pressure wave supercharger which alternately introduces air and exhaust gas into a plurality of compartments provided in a casing, and utilizes the pressure of the exhaust gas introduced into the compartments. The waves increase the pressure of the air in the compartment, thereby supercharging. Background technique [0002] There is known a pressure wave supercharger which is provided across an intake passage and an exhaust passage and utilizes a pressure wave of the exhaust gas to perform supercharging. In this pressure wave booster, air and exhaust are alternately introduced into a plurality of compartments provided in a casing, and the pressure of the air in the compartments is increased by pressure waves of the exhaust gases introduced into the compartments. Then, the pressure-increased air is discharged into the intake passage to perform super...

AI Technical Summary

Problems solved by technology

In this case, when the rotation speed of the internal combustion engine changes and the rotation speed of the rotor changes, the gas whose pressure has been increased sufficiently may not be discharged to the intake passage.

Therefore, there is a possibility that the pressure of the intake air cannot be increased to the target intake pressure

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