Patent ID: 8925528
Filing Date: 2015-01-06
Classification: F02B,F04C

Abstract:
1. An engine comprising: a piston operable to reciprocate in a cylinder according to a four stroke cycle; a crankshaft rotatably coupled to the piston; a supercharger rotatably coupled to the crankshaft, the supercharger having an unequal distribution of mass along a longitudinal plane of the supercharger, the supercharger being operable to produce a rotation couple that provides a rotational counterbalance to reduce engine imbalance, wherein the supercharger includes a first rotor and a second rotor in the longitudinal plane, the second rotor being operable to rotate in an opposite direction of the first rotor, the first and second rotors being parallel to the crankshaft, and wherein the first and second rotors rotate at a 2:1 ratio as the crankshaft to cause a 2nd order rotation couple; a bypass passage fluidly coupled between a point downstream of the supercharger and a point upstream of the supercharger; a bypass valve positioned in the bypass passage, the bypass valve being operable to selectively allow air to flow from the point downstream of the supercharger to the point upstream of the supercharger; and a controller including a processor and non-transitory computer readable medium having instructions that when executed by the processor: