To efficiently recover waste heat from compressed intake air when an output of a prime mover is comparatively low.
A prime mover system 1 comprises: a prime mover 3; a supercharger system 4; and a waste heat recovery device 6 for recovering waste heat of scavenging air. The supercharger system 4 comprises a first supercharger 41, and a second supercharger 42. An exhaust flow rate corresponding to a maximum compression ratio of the first supercharger 41 is equal to a flow rate of exhaust air from the prime mover 3 during a predetermined threshold output. In the prime mover system 1, when an operation output of the prime mover 3 is not more than a threshold output, a total amount of the exhaust air from the prime mover 3 is supplied to the first supercharger 41. Also, when the operation output of the prime mover 3 is higher than the threshold output, one part of the exhaust air from the prime mover 3 is supplied to the second supercharger 42 on the basis of a difference between the operation output and the threshold output. Thereby, when the operation output of the prime mover 3 is not more than the threshold output, the waste heat can be efficiently recovered from the scavenging air supplied to the prime mover 3 from the supercharger system 4.
OKAZAKI YASUHIDE
YAGI KOTARO
MOTODA TAKAMITSU
FUKUYAMA MASAHISA
Tsutomu Tanaka
Masamichi Ida