A method of controlling a supercharger includes: an information conversion step, a map deducing step, a boost amount deducing step, and a RPM deducing step. In the information conversion step, a sensor detects information of a vehicle, and a control unit converts the information into a factor and saves. The map deducing step includes deducing a total boost amount for driving an engine, and deducing a map for a target boost amount of a supercharger using a boost pressure of a turbocharger. A correction value deduced in the boost amount deducing step is calculated according to vehicle environment information, and a target RPM of the supercharger is calculated based on the target boost amount of the supercharger, and a boost pressure by the supercharger. In particular, the target boost amount of the supercharger is deduced based on the correction value, the converted factor, and the deduced map.

A method of controlling a supercharger includes: an information conversion step, a map deducing step, a boost amount deducing step, and a RPM deducing step. In the information conversion step, a sensor detects information of a vehicle, and a control unit converts the information into a factor and saves. The map deducing step includes deducing a total boost amount for driving an engine, and deducing a map for a target boost amount of a supercharger using a boost pressure of a turbocharger. A correction value deduced in the boost amount deducing step is calculated according to vehicle environment information, and a target RPM of the supercharger is calculated based on the target boost amount of the supercharger, and a boost pressure by the supercharger. In particular, the target boost amount of the supercharger is deduced based on the correction value, the converted factor, and the deduced map.

A supercharged internal combustion engine is provided that is capable of introducing EGR gas into an intake passage on an upstream side relative to a compressor. When a required WGV opening degree is less than a lower limit value WGVmin in a case in which introduction of EGR gas is started under a situation in which the temperature of an EGR valve is less than or equal to a predetermined value X1, the WGV opening degree is controlled during a protection time period T3 after introduction of EGR gas starts by using the lower limit value WGVmin as the required WGV opening degree.

A supercharged internal combustion engine is provided that is capable of introducing EGR gas into an intake passage on an upstream side relative to a compressor. When a required WGV opening degree is less than a lower limit value WGVmin in a case in which introduction of EGR gas is started under a situation in which the temperature of an EGR valve is less than or equal to a predetermined value X1, the WGV opening degree is controlled during a protection time period T3 after introduction of EGR gas starts by using the lower limit value WGVmin as the required WGV opening degree.

A turbocharger includes a waste gate valve, a compressor, a turbine, a turbine housing which houses the turbine, a bypass channel which includes an opening cross-section, the bypass channel bypassing the turbine, a bypass channel portion formed in the turbine housing, an actuator housing which includes a separate first coolant channel having a coolant inlet port and a coolant outlet port, an electric motor arranged in the actuator housing, a transmission which includes an output shaft, the transmission being arranged in the actuator housing, and a control body coupled to the output shaft. The actuator housing is formed separately and is secured to the turbine housing. The control body controls the opening cross-section of the bypass channel.

A turbocharger includes a waste gate valve, a compressor, a turbine, a turbine housing which houses the turbine, a bypass channel which includes an opening cross-section, the bypass channel bypassing the turbine, a bypass channel portion formed in the turbine housing, an actuator housing which includes a separate first coolant channel having a coolant inlet port and a coolant outlet port, an electric motor arranged in the actuator housing, a transmission which includes an output shaft, the transmission being arranged in the actuator housing, and a control body coupled to the output shaft. The actuator housing is formed separately and is secured to the turbine housing. The control body controls the opening cross-section of the bypass channel.

A turbocharger includes a waste gate valve, a compressor with a turbine, a turbine housing which houses the turbine, a bypass channel with an opening cross-section, a bypass channel portion formed in the turbine housing, an actuator housing with a separate coolant channel, an electric motor arranged in the actuator housing, a transmission with an output shaft, the transmission being arranged in the actuator housing and being provided as a worm wheel gear unit, and a control body coupled to the output shaft of the transmission. The bypass channel bypasses the turbine. The actuator housing is removably secured to the turbine housing. The control body controls the opening cross-section of the bypass channel.

A turbocharger includes a waste gate valve, a compressor with a turbine, a turbine housing which houses the turbine, a bypass channel with an opening cross-section, a bypass channel portion formed in the turbine housing, an actuator housing with a separate coolant channel, an electric motor arranged in the actuator housing, a transmission with an output shaft, the transmission being arranged in the actuator housing and being provided as a worm wheel gear unit, and a control body coupled to the output shaft of the transmission. The bypass channel bypasses the turbine. The actuator housing is removably secured to the turbine housing. The control body controls the opening cross-section of the bypass channel.

An electric supercharger wherein the assemblability of a bearing holding structure is improved is provided. An electric motor 30 of an electric supercharger 101 has a shaft 22. A second bearing 24 supports the shaft 22 rotatably. The second bearing 24 comprises an outer ring 24a and an inner ring 24b rotatable with respect to each other. A second bearing sleeve 26 supports the outer ring 24a as a fixed ring. A key ring 51 positions the outer ring 24a with respect to the second bearing sleeve 26. A preloading spring 52 energizes the key ring 51 toward the outer ring 24a or the second bearing sleeve 26.

An electric supercharger wherein the assemblability of a bearing holding structure is improved is provided. An electric motor 30 of an electric supercharger 101 has a shaft 22. A second bearing 24 supports the shaft 22 rotatably. The second bearing 24 comprises an outer ring 24a and an inner ring 24b rotatable with respect to each other. A second bearing sleeve 26 supports the outer ring 24a as a fixed ring. A key ring 51 positions the outer ring 24a with respect to the second bearing sleeve 26. A preloading spring 52 energizes the key ring 51 toward the outer ring 24a or the second bearing sleeve 26.