An engine system having an ERG apparatus may include an engine including a plurality of combustion chambers generating a driving torque by combustion of a fuel; an intake line inflowing an intake gas supplied to the combustion chamber; an exhaust line flowing an exhaust gas exhausted from the combustion chamber; a turbocharger including a turbine provided at the exhaust line and rotated by the exhaust gas exhausted from the combustion chamber and a compressor provided at the intake line, rotated in connection with the turbine, and compressing external air; and an EGR apparatus including a recirculation line branched from the exhaust line and joined to the intake line, a flow rate controller mounted at the recirculation line and measuring and controlling an amount of recirculation gas, and a pressure sensor mounted at the recirculation line to measure a pressure of the recirculation gas.

An engine system having an ERG apparatus may include an engine including a plurality of combustion chambers generating a driving torque by combustion of a fuel; an intake line inflowing an intake gas supplied to the combustion chamber; an exhaust line flowing an exhaust gas exhausted from the combustion chamber; a turbocharger including a turbine provided at the exhaust line and rotated by the exhaust gas exhausted from the combustion chamber and a compressor provided at the intake line, rotated in connection with the turbine, and compressing external air; and an EGR apparatus including a recirculation line branched from the exhaust line and joined to the intake line, a flow rate controller mounted at the recirculation line and measuring and controlling an amount of recirculation gas, and a pressure sensor mounted at the recirculation line to measure a pressure of the recirculation gas.

A turbocharged natural-gas engine comprises a first drive system (201), a second drive system (202), a third drive system (203) and a fourth drive system (204). The first drive system (201) comprises a gas storage cylinder (72), an eighth motor (65), an axial flow compressor (68), a combustion chamber (71), a first safety device (69), a second safety device (79), an electric ignition device (54), a third drive device (96), a nozzle (102), a turbine (205), a turboshaft (206) and a ninth bracket (70). The gas storage cylinder, the eighth motor, the axial flow compressor, the combustion chamber, the first safety device, the second safety device, the first lever braking device, an electric ignition device, the third drive device and a nozzle are arranged on the ninth bracket; the eighth motor is connected with the axial flow compressor, and the axial flow compressor is driven by the eighth motor.

A mechanical supercharging system includes a stepped transmission that connects a crankshaft of an internal combustion engine with driving wheels, a centrifugal supercharger including a rotary drive shaft connected to the crankshaft, a variable speed ratio device that changes a speed ratio of the rotary drive shaft to the crankshaft, the variable speed ratio device being provided between the crankshaft and the rotary drive shaft; and a control device configured to control the speed ratio. The control device increases the speed ratio during the upshift operation more than the speed ratio before start of the upshift operation.

A mechanical supercharging system includes a stepped transmission that connects a crankshaft of an internal combustion engine with driving wheels, a centrifugal supercharger including a rotary drive shaft connected to the crankshaft, a variable speed ratio device that changes a speed ratio of the rotary drive shaft to the crankshaft, the variable speed ratio device being provided between the crankshaft and the rotary drive shaft; and a control device configured to control the speed ratio. The control device increases the speed ratio during the upshift operation more than the speed ratio before start of the upshift operation.

A variable turbine geometry (VTG) turbocharger is disclosed. The VTG turbocharger may comprise a turbine section having a turbine wheel and plurality of guide vanes configured to regulate a flow of exhaust gases to the turbine wheel. The VTG turbocharger may further comprise an actuation pivot shaft (APS) configured to mediate actuation of opening and closing of the guide vanes, a bushing rotatably supporting the APS with a clearance therebetween, and a radial seal circumscribing the APS and inserted in a cavity of the bushing. The radial seal may form an interference fit with both an outer diameter of the APS and an inner diameter of the bushing to seal a leakage of the exhaust gases between the clearance between the APS and the bushing.

A variable turbine geometry (VTG) turbocharger is disclosed. The VTG turbocharger may comprise a turbine section having a turbine wheel and plurality of guide vanes configured to regulate a flow of exhaust gases to the turbine wheel. The VTG turbocharger may further comprise an actuation pivot shaft (APS) configured to mediate actuation of opening and closing of the guide vanes, a bushing rotatably supporting the APS with a clearance therebetween, and a radial seal circumscribing the APS and inserted in a cavity of the bushing. The radial seal may form an interference fit with both an outer diameter of the APS and an inner diameter of the bushing to seal a leakage of the exhaust gases between the clearance between the APS and the bushing.

An engine assembly including an internal combustion engine configured to be received in an engine compartment and a heat exchanger having a first conduit fluidly connected to a fluid circuitry of the engine and a second conduit fluidly connecting an interior of the engine compartment to its environment. The first conduit is in heat exchange relationship with the second conduit. The assembly further includes a forced air system operable in use to provide an air flow from the environment to the outlet via the second conduit of the heat exchanger and the engine compartment. The assembly further includes a selector valve configurable to selectively fluidly connect an air intake of the internal combustion engine with the interior of the engine compartment in a first valve position and with the environment in a second valve position. A method for supplying air to an internal combustion engine is also discussed.

A variable turbine geometry turbine turbocharger (1) includes vanes (30) configured to control flow of exhaust gas to a turbine wheel (12), and an adjustment ring (40) connected to each vane (30) that controls the angular orientation of all the vanes (30) in unison. The adjustment ring (40) is supported on the bearing housing (16) and is supported on, and piloted relative to, an axially extending nose portion (17) of the bearing housing (16) by surface features (60) formed along an inner edge (43) of the adjustment ring (40).

An engine control device (1) having a supercharger (30) includes an injection controller (3) that controls injections of fuel through a cylinder injection valve (11) and through a port injection valve (12), based on a rotation speed Ne of an engine (10), and a variable valve controller (5) that controls a variable valve actuating mechanism (40) based on the rotation speed Ne. The variable valve controller (5) provides a valve overlap period in a first rotation speed region, and shortens the valve overlap period in a second rotation speed region of greater rotation speeds Ne than in the first rotation speed region. The injection controller (3), in the period during which the rotation speed is shifting from the first rotation speed region to the second rotation speed region, carries out a cylinder injection and a port injection, and advances timing for injecting the fuel through the port injection valve (12).