Turbo-charger engine system

A turbo-charger engine system for an engine, said system comprising an exhaust pipe leading from the engine and a charging pipe leading to the engine, a plurality of turbo-chargers connected in series with the engine in a communication manner, said plurality of turbo-chargers comprising a high-pressure turbo-charger and at least one low pressure turbo-charger, said high-pressure turbo-charger being in communication with said exhaust pipe and said charging pipe, a low-pressure exhaust pipe providing communication from said high-pressure turbo-charger to said low pressure turbo-charger and a low-pressure charging pipe providing communication from said low-pressure turbo-charger to said high-pressure turbo-charger, an exhaust bypass providing communication directly between the exhaust pipe and the low-pressure turbo-charger and bypassing the high-pressure turbo-charger, a charging bypass providing communication from said low-pressure charging pipe to said charging pipe and bypassing the high-pressure turbo-charger, an exhaust switching valve provided in the exhaust bypass for selectively disabling at least one said turbo-charger in response to a selected engine operating condition, a check valve provided in the charging bypass and an actuator operative in accordance with the state of engine operation for opening the exhaust switching valve, the improvement comprising a rotary valve provided in an intake passageway intermediate the charging pipe and the engine, pressure measuring means in communication with the charging pipe for sensing charging pressure in the charging pipe, opening and closing timing adjustment means operatively connected to the pressure measuring means and to the rotary valve, wherein the rotary valve is closed in the course of an intake stroke via the opening and closing timing adjusting mechanism operative in accordance with the charging pressure.