An internal combustion engine includes a crankcase that defines a crank chamber, a crankshaft that has a crank housed in the crank chamber and is rotatably supported on the crankcase, a cylinder block that is joined to the crankcase and defines a plurality of cylinders in a horizontally-opposed arrangement, a to-be-detected body that rotates integrally with the crankshaft, and a detection sensor that extends through the crankcase from an upper face of the crankcase, is made to face a trajectory of the to-be-detected body, and generates a pulse signal in response to movement of the to-be-detected body. Thus, in a so-called horizontally-opposed internal combustion engine, a structure for disposing a detection sensor that can detect the angular velocity of a crankshaft with high precision is provided.

Improvements in a mechanism that determines top dead center of an internal combustion engine where detecting the top of the stroke can be difficult to determine as the crank is being rotated. The gauge set mounts into a spark plug or fuel injector hole. These holes are usually a tapped hole where the piston position gauge can be threaded into, to provide a stable and concentric mount where the measurement pin passes through the exterior threaded shaft of the mount. A pin extends into the cylinder to determine when the piston is approaching and at the top of the cylinder. The mount is an elongated stalk that allows for additional cam gauges where the cam gauges can be mounted and linearly adjustable on the single stalk. The measurement is with dial indicators so a user can measure three varying engine parts to determine the top-dead-center.

An internal combustion engine includes a crankshaft that is rotatably supported on the crankcase, a cylinder block that is joined to the crankcase and defines a plurality of cylinders in a V-type arrangement in which the cylinders are disposed above a virtual horizontal plane including a rotational axis of the crankshaft and intersect each other at a bank angle, a to-be-detected body that rotates integrally with the crankshaft, and a detection sensor that is mounted from an outside at a position, lower than the virtual horizontal plane, of a front face of the crankcase that receives air flow, is made to face a trajectory of the to-be-detected body, and generates a pulse signal in response to movement of the to-be-detected body. Thereby provided is a structure for disposing a detection sensor that can detect the angular velocity of a crankshaft with high precision in a so-called V-type internal combustion engine.

A method and system for a hybrid opposed piston engine with dynamic controlling of the combustion volume and power output is provided. The method includes using a control system to control a phasing of opposed pistons for achieving a desired combustion volume during a combustion cycle. The control system can control an activation of an ignition of the hybrid opposed piston engine, such as to activate the ignition when a desired condition is present in the combustion chamber. Various embodiments of the hybrid opposed piston engine are further provided.

Improvements in a mechanism that determines top dead center of an internal combustion engine where detecting the top of the stroke can be difficult to determine as the crank is being rotated. The gauge set mounts into a spark plug or fuel injector hole. These holes are usually a tapped hole where the piston position gauge can be threaded into, to provide a stable and concentric mount where the measurement pin passes through the exterior threaded shaft of the mount. A pin extends into the cylinder to determine when the piston is approaching and at the top of the cylinder. The mount is an elongated stalk that allows for additional cam gauges where the cam gauges can be mounted and linearly adjustable on the single stalk. The measurement is with dial indicators so a user can measure three varying engine parts to determine the top-dead-center.

An internal combustion engine includes a crankshaft that has a journal linked to a bearing and is rotatably supported on the crankcase, a power transmission gear fixed to an extremity of the crankshaft that has a smaller diameter than a diameter of the journal and projects outward of the crankcase, a to-be-detected body that is fixed on an outer periphery of a collar member disposed between the bearing and the power transmission gear and is relatively non-rotatably supported on the crankshaft, and a detection sensor that is made to face a trajectory of the to-be-detected body and detects movement of the to-be-detected body to generate a pulse signal. This provides a structure for disposing a to-be-detected body that enables any increase in the dimensions of an internal combustion engine to be avoided.

An internal combustion engine includes a crankshaft that is rotatably supported on a crankcase via a pair of bearings and has a crank housed in a crank chamber, a to-be-detected body that is housed in the crank chamber and is supported on the crankshaft, and a detection sensor that is made to face a trajectory of the to-be-detected body and detects movement of the to-be-detected body to generate a pulse signal. The to-be-detected body is disposed on an inner side of the bearing. Thus, an internal combustion engine is provided that enables a crank angle to be detected in a state in which vibration and flexure occurring in a crankshaft are suppressed.

An internal combustion engine includes a crankcase that defines a crank chamber, a crankshaft that has a crank housed in the crank chamber and is rotatably supported on the crankcase, a cylinder block that is joined to the crankcase and defines a plurality of cylinders in a horizontally-opposed arrangement, a to-be-detected body that rotates integrally with the crankshaft, and a detection sensor that extends through the crankcase from an upper face of the crankcase, is made to face a trajectory of the to-be-detected body, and generates a pulse signal in response to movement of the to-be-detected body. Thus, in a so-called horizontally-opposed internal combustion engine, a structure for disposing a detection sensor that can detect the angular velocity of a crankshaft with high precision is provided.

To provide sensing system layout structure of an internal combustion engine that enables increasing a degree of freedom in laying out a sensing system. In sensing system layout structure of an internal combustion engine provided with a sensing system for sensing rotation of a camshaft, the internal combustion engine is provided with a driving shaft rotated in synchronization with the camshaft, the sensing system is provided with a driving shaft rotation detecting sensor arranged opposite to a rotated portion on a side of the driving shaft, and rotation of the driving shaft is sensed by the driving shaft rotation detecting sensor.

An internal combustion engine includes a crankshaft that has a journal linked to a bearing and is rotatably supported on the crankcase, a power transmission gear fixed to an extremity of the crankshaft that has a smaller diameter than a diameter of the journal and projects outward of the crankcase, a to-be-detected body that is fixed on an outer periphery of a collar member disposed between the bearing and the power transmission gear and is relatively non-rotatably supported on the crankshaft, and a detection sensor that is made to face a trajectory of the to-be-detected body and detects movement of the to-be-detected body to generate a pulse signal. This provides a structure for disposing a to-be-detected body that enables any increase in the dimensions of an internal combustion engine to be avoided.