A UAV propulsion system is disclosed that utilizes a crankcase having a first crankcase compartment and a second crankcase compartment. Each crankcase compartment includes a corresponding cylinder assembly and piston, with each piston being interconnected with a rotatable crankshaft. A first airflow path extends from an exterior of the UAV propulsion system to the first crankcase compartment, and a separate second airflow path extends from the exterior of the UAV propulsion system to the second crankcase compartment. A first rotary valve may be mounted on and rotate with the crankshaft to control the airflow along the first airflow path to the first crankcase compartment, while a second rotary valve may be mounted on and rotate with the crankshaft to control the airflow along the second airflow path to the second crankcase compartment.

A UAV propulsion system is disclosed that utilizes a crankcase having a first crankcase compartment and a second crankcase compartment. Each crankcase compartment includes a corresponding cylinder assembly and piston, with each piston being interconnected with a rotatable crankshaft. A first airflow path extends from an exterior of the UAV propulsion system to the first crankcase compartment, and a separate second airflow path extends from the exterior of the UAV propulsion system to the second crankcase compartment. A first rotary valve may be mounted on and rotate with the crankshaft to control the airflow along the first airflow path to the first crankcase compartment, while a second rotary valve may be mounted on and rotate with the crankshaft to control the airflow along the second airflow path to the second crankcase compartment.

A reciprocating internal combustion engine is disclosed having co-axially aligned cylinder blocks within a housing, each cylinder block having a piston structure comprising a piston head and a connecting rod. The piston heads are adapted to reciprocate within their respective cylinder blocks. The connecting rods are connected to opposite ends of a central yoke structure, pivotally, with the ability to angularly deviate from a longitudinal axis during a cycle of motion. The central yoke structure consists of a roller gear disposed within a void of the central yoke structure, and the linear motion of the piston structure is translated into the rotary motion of the roller gear.

Disclosed is a toothed wheel for a camshaft, forming a target for a camshaft position sensor, the toothed wheel including a circular body including two opposite main faces, and at least four teeth distributed around the circumference of the circular body, each tooth including two edges, one corresponding to a rising edge and the other to a falling edge, according to a direction of rotation of the wheel, the angular separation between the edges of each tooth being different for each tooth, characterized in that the four teeth are shaped so that the toothed wheel includes, considering the same main face and the same direction of rotation of the wheel: four edges of the same first rising or falling type spaced apart by 90° respectively, and three edges of the second falling or rising type respectively, spaced apart by 120° respectively.

Disclosed is a toothed wheel for a camshaft, forming a target for a camshaft position sensor, the toothed wheel including a circular body including two opposite main faces, and at least four teeth distributed around the circumference of the circular body, each tooth including two edges, one corresponding to a rising edge and the other to a falling edge, according to a direction of rotation of the wheel, the angular separation between the edges of each tooth being different for each tooth, characterized in that the four teeth are shaped so that the toothed wheel includes, considering the same main face and the same direction of rotation of the wheel: four edges of the same first rising or falling type spaced apart by 90° respectively, and three edges of the second falling or rising type respectively, spaced apart by 120° respectively.

Methods and systems are described for monitoring air/fuel imbalance in cylinders of an engine. Engine speed signals are sampled and then run through a notch filter set to the sampling frequency. Based on a first frequency content of the resulting filtered engine speed, cylinder imbalance is detected and addressed.

Methods and systems are described for monitoring air/fuel imbalance in cylinders of an engine. Engine speed signals are sampled and then run through a notch filter set to the sampling frequency. Based on a first frequency content of the resulting filtered engine speed, cylinder imbalance is detected and addressed.

A rotational combustion engine that generates force from the reciprocal motion and centripetal motion of one or more pistons that is then converted into rotational motion of a first cam and second cam wherein the cams are separated by a 2-3 degree horizontal offset and an angle of 60 degrees as well as camshaft assembly and driving shaft to provide power to an entity such as an automobile.

The invention relates to a power unit, in particular for a hybrid vehicle, comprising a reciprocating piston engine and comprising a generator which can be in driving engagement therewith, wherein the reciprocating piston engine has at least two pistons, which are guided in at least two cylinders in tandem arrangement, and two counter-rotating crankshafts, which are connected to the pistons by connecting rods and which are mechanically coupled so as to be in phase, wherein a first generator can be driven by the first crankshaft and a second generator can be driven by the second crankshaft.

The invention relates to a power unit, in particular for a hybrid vehicle, comprising a reciprocating piston engine and comprising a generator which can be in driving engagement therewith, wherein the reciprocating piston engine has at least two pistons, which are guided in at least two cylinders in tandem arrangement, and two counter-rotating crankshafts, which are connected to the pistons by connecting rods and which are mechanically coupled so as to be in phase, wherein a first generator can be driven by the first crankshaft and a second generator can be driven by the second crankshaft.