摘要:
A valve arrangement for supplying air to a combustion chamber of an internal combustion engine includes a first valve, the first valve including a first valve head, a first valve stem assembly and an internal cavity, which is at least partly located in the first valve stem assembly, and a second valve partly arranged within the internal cavity of the first valve, the second valve including a second valve head and a second valve stem assembly, and being movable within the internal cavity between an upper, closed position and a lower, open position, wherein a junction seal extends over a junction between the first valve stem assembly and the second valve stem assembly when the second valve is in the closed position. A leakage preventing arrangement is arranged to hinder leakage of liquid from the outside of the junction seal from reaching in between the first valve stem assembly and the second salve stem assembly.
摘要:
A method for operating and engine having a cylinder with at least an intake and exhaust valve, comprising of performing a combustion cycle in the cylinder in which exhaust valve closing occurs after intake valve opening thereby creating valve overlap, boosting intake air above exhaust pressure, where said boosted intake air is inducted into said cylinder while said intake valve is open and at least a first portion of said inducted boosted intake air flows past the exhaust valve with both said intake and exhaust valves are open during said overlap, directly injecting fuel to said cylinder that is combusted in said cylinder, where a beginning of said fuel injection occurs after said exhaust valve closing and said directly injected fuel is mixed with at least a second portion of said inducted boosted intake air, and combusting said mixture at a rich air-fuel ratio.
摘要:
The present invention relates to a two-stroke engine comprising at least a cylinder (111) in which a piston (112) moves and one end of which communicates with a pump sump (115) crossed by the crankshaft (114) of the engine, a capacity under pressure (87) opening at one end into said pump sump, at the other end into the combustion chamber (113) of cylinder (111), a valve (86) providing an intermittent seal between chamber (113) and capacity (87), a means (88) for carburetting the gases passing through said capacity (87), a means (82) for controlling the motion of said valve (86), comprising a supple membrane (89) separating a first chamber (95a) and a second chamber (95b), said membrane being connected to the valve rod. According to the invention, said engine further comprises a first means (92) for connecting the second chamber (95b) to the cylinder, the means being intended to retard the opening of said valve (86) by controlling the pressure in said chamber (95b).
摘要:
A rotary commutator valve that is located at the exhaust ports of the cylinder of an internal combustion, reciprocal engine for regulating the flow of exhaust and allowing the exhaust ports to be sequentially utilized as supplementary intake ports for charging the engine cylinder, the communtator valve having an exhaust passage, an intake passage and a common exhasut/intake passage that communicates with the exhaust ports and a rotor with a rotor notch that sequentially and selectively connects either the intake passage or the exhaust passage to the common exhasut/intake passage allowing the exhaust ports to first exhaust combustion gases and then form supplemental intake ports for admitting additional air.
摘要:
A crankchamber precompression type two-cycle internal combustion engine including cylinder assemblies of an even number consists of at least one pair of cylinder assemblies having working cycles with 180.degree. phase difference, each cylinder assembly having a stepped cylinder constituted by a minor diameter cylinder portion and a major diameter cylinder portion, a stepped piston received in the stepped cylinder and constituted by a minor diameter piston portion and a major diameter piston portion, the minor diameter and major diameter piston portions being in sliding engagement with the minor diameter and the major diameter cylinder portions of the stepped cylinder respectively to provide an annular space serving as sub-intake chamber in the major diameter portions of the cylinders, the sub-intake chambers being connected to an auxiliary scavenging nozzle oriented toward a combustion chamber of the other associated cylinder. The sub-intake chambers are connected to auxiliary carburetors set beforehand in such a manner that they form a mixture of fuel of high quality and air, and crankchambers of the cylinders are connected to main carburetors set beforehand in such a manner that they form a mixture of fuel of low quality and air. By this arrangement, the mixture of fuel of high quality and air is first ignited in the combustion chambers to produce flame surfaces in a large area to enable complete combustion of the mixture of fuel of low quality with air to be achieved.
摘要:
A gas feeding arrangement for feeding gas from an internal combustion engine cylinder chamber to a gas tank includes a feeding conduit assembly and a dedicated feeding valve. The feeding valve is adapted to assume an open condition in which it provides for gas transport in a direction from the cylinder chamber towards the gas tank, via the feeding conduit assembly. The gas feeding arrangement includes a one-way valve adapted to prevent gas transport from the gas tank to the cylinder chamber, via the feeding conduit assembly.
摘要:
A valve arrangement for supplying air to a combustion chamber of an internal combustion engine includes a first valve, the first valve including a first valve head, a first valve stem assembly and an internal cavity, which is at least partly located in the first valve stem assembly, and a second valve partly arranged within the internal cavity of the first valve, the second valve including a second valve head and a second valve stem assembly, and being movable within the internal cavity between an upper, closed position and a lower, open position, wherein a junction seal extends over a junction between the first valve stem assembly and the second valve stem assembly when the second valve is in the closed position. A leakage preventing arrangement is arranged to hinder leakage of liquid from the outside of the junction seal from reaching in between the first valve stem assembly and the second salve stem assembly.
摘要:
A method for estimating output compressor output temperature for a two-stage turbocharger. The method includes: storing a composite relationship relating temperature ratio across a pair of compressors of the two-stage turbocharger as a function of mass flow through such pair of compressors and pressure drop across the pair of the compressors; calculating the pressure ratio equal to the pressure at an input to the first one of the pair of compressors to the pressure at the output of the second one of the pair compressor; using the composite relationship and an output of a mass flow at the input to the first one of the pair of compressors and the calculated pressure ratio to determine the temperature ratio across the pair of compressors; and calculating the estimated output temperature of the second one of the pair of compressors by multiplying the determined temperature ratio across the pair of compressors by a temperature at the input of the first one of the pair of compressors.