Abstract:
A method to select cylinder and valve operational modes in an internal combustion engine with valves that may be deactivated. A simplified method to select cylinder and valve modes is presented.
Abstract:
A method to select cylinder and valve operational modes in an internal combustion engine with valves that may be deactivated. A simplified method to select cylinder and valve modes is presented.
Abstract:
A method to control valves that may be deactivated during multi-stroke cylinder operation. Valves are controlled to improve drivability and reduce valve degradation.
Abstract:
Hydraulic engine valve actuation systems and methods for internal combustion engines. The systems utilize a proportional valve to regulate the flow of a working fluid to and from a hydraulic actuator controlling the engine valve position. The position of the proportional valve is controlled by one or more high speed valves to control various engine valve parameters, including engine valve takeoff and landing velocities. Returning all valves to a known starting position between engine valve events avoids accumulation of errors in proportional valve positioning. Embodiments using spool valves for the high speed valves and the proportional valve, and spring return and hydraulic return for the engine valve, are disclosed. A specially shaped spool in the proportional valve provides enhanced control over the engine valve operation. Various further alternate embodiments are disclosed.
Abstract:
To make a small two-stroke engine of the kind used primarily in handheld working tools, such as chainsaws, for example, easier to start, it is provided with a combined decompression and priming valve (30), which can be actuated manually, or by an electronic control unit or by pressure differences arising upon rotation of the crankshaft (16) of the engine and acting on a piston (34) in a piston and cylinder assembly included in the valve (30). The combined decompression and priming valve (30) has an inlet (323) connected to an induction conduit (20 for an air-fuel mixture by a conduit (201), so as to prime the engine (1) when the downwards moving piston (7) of the engine creates an underpressure in the engine cylinder (9).
Abstract:
A hybrid internal combustion engine having a cylinder, a piston disposed within the cylinder, said piston constructed and arranged to reciprocate within said cylinder, and a combustion chamber defined by the cylinder and the top of the piston. The hybrid internal combustion engine also includes an exhaust manifold and a heat exchanger is disposed within the exhaust manifold. A pump disposed between the heat exchanger and a fluid reservoir is provided to deliver fluid to from the reservoir to heat exchanger, whereby the fluid in the heat exchanger is heated and turned into high pressure gas (HPG) when the combustion gases are exhausted from the combustion chamber via the exhaust manifold. The resulting HPG may then be introduced into the combustion chamber to provide a HPG power stroke.
Abstract:
Le système destiné à un moteur à gaz sous pression comporte une chambre à volume variable et, une soupape (1) comprenant un premier élément fixe (3) destiné à permettre une fixation de la soupape sur le moteur, un deuxième élément mobile (5) destiné à obturer de manière conditionnelle un passage de communication du gaz avec la chambre à volume variable, des premiers moyens de liaison déformables élastiquement (9) liant les premier et deuxième éléments ensembles, la chambre comportant, en outre, des moyens de mise en œuvre du deuxième et du troisième élément mobile de la soupape.
Abstract:
La presente invención se refiere a un motor de ocho tiempos que presenta un elevado rendimiento térmico y bajas emisiones contaminantes y que está formado por un motor de combustión interna y un intercambiador de calor debido a que aprovecha el calor residual de los gases de escape de un primer tiempo de escape del motor de combustión interna para calentar parte del aire admitido por el cilindro en el tiempo de admisión, que posteriormente pasa a un depósito auxiliar que se utiliza posteriormente para llevar a cabo la carga y expansión de ese aire en el interior del cilindro y su posterior escape, una vez que han tenido lugar seis primeros tiempos de admisión, primera compresión, transferencia, segunda compresión, primera expansión y primer escape.
Abstract:
A switching mechanism capable of switching between a two-stroke operation and a four-stroke operation of an engine as desired, wherein the switching mechanism is switchable between engagement with a first cam lobe for four-stroke operation and a second cam lobe for two-stroke operation.