摘要:
This invention provides an exhaust gas purifier for a diesel engine provided with a continuous regeneration-type DPF using a catalyst. A by-pass passage is provided in an exhaust passage (7) in a diesel engine provided with a continuous regeneration-type DPF (12), and a small-capacity second continuous regeneration-type DPF (13) is installed. In a low-exhaust gas temperature region, PM is collected by the second continuous regeneration-type DPF (13). In this case, premixing combustion in which fuel injection timing for injecting a fuel into a cylinder is hastened is carried out to reduce the amount of PM produced. Accordingly, satisfactory collection can be carried out even when the capacity of the second continuous regeneration-type DPF (13) is small. Further, since the production of NOx is suppressed, a cooled exhaust gas is recirculated into a cylinder. Further, a urea-added SCR catalyst is installed in the exhaust passage (7) for reductive decomposition of NOx contained in the exhaust gas to further reduce NOx.
摘要:
The invention relates to a valve train actuating device, particularly for an internal combustion engine, having at least one firing camshaft (10), which can be phase-shifted toward a crankshaft (12) by means of a firing camshaft adjusting device (11), and having a decompression brake device (13) comprising at least one brake cam (14) and at least one decompression valve train (15). The invention provides that the valve train actuating device comprises an adjusting device (16) intended for adjusting a decompression valve train point of time.
摘要:
Low load operating point for a controlled auto-ignition four-stroke internal combustion engine is reduced without compromising combustion stability through a valve control operative to establish sub-atmospheric pressure conditions within the combustion chamber into which fuel and exhaust gases are introduced.
摘要:
Lost motion systems and methods for providing engine valves with variable valve actuation for engine valve events are disclosed. The system may include a master piston (210) hydraulically linked to a slave piston (230), and a dedicated cam (110) operatively connected to the master piston. The slave piston may be disposed substantially perpendicular to the master piston in a common housing. The slave piston is adapted to actuate one or more engine valves (300). The slave piston may incorporated an optical valve seating assembly into its upper end. A trigger valve (260) may be operatively connected to the master-slave hydraulic circuit to selectively release and add hydraulic fluid to the circuit.
摘要:
A lift-control device for a valve (2), valve-lift means. A first valve-lift means (5) with (6) a profile of a cam (11) or eccentric acting on a rocker (6) in order to cause it to oscillate about a first axis (B) so as to move the valve (2) according to a first valve-lift law; a second valve-lift means (10) with an auxiliary rocker, (10) which co-operates in contact with the first valve-lift means (5) for receiving a motion of oscillation about a second axis (C) and a profiled portion of one between said rocker (6) and said auxiliary rocker(20), having a profile that defines the second valve-lift law.
摘要:
A method of operating a four stroke internal combustion engine comprising the steps of using inlet valve means (15) to regulate admission of a mixture of fuel and air into a combustion chamber (12), using a compressor (151) to compress the fuel and air mixture prior to admission of the mixture into the combustion chamber (12), using exhaust valve means (16) to regulate flow of combusted gases from the combustion chamber (12), closing the exhaust valve means (16) prior to the end of the exhaust stroke to trap combusted gases in the combustion chamber (12), opening the inlet valve means (15) during the intake stroke to admit a charge of fuel and air mixture into the combustion chamber (12) to be mixed with the previously trapped combusted gases, whereby in the combustion chamber (12) conditions are generated which enable the mixture of fuel, air and combusted gases to combust by auto-ignition, with the combusted gases expanding during the power stroke. By opening the inlet valve means (15) to admit a preconditioning charge of fuel and air into the combustion chamber (12) to be mixed with the trapped combusted gases after closing of the exhaust valve means (16) during the exhaust stroke and prior to the opening of the inlet valve means (15) in the induction stroke to admit the charge of fuel and air which is combusted to expand in the power stroke.
摘要:
A method of drivingly controlling valves of an engine with a turbocharger capable of securely preventing surging from occurring even if the engine with the turbocharger is operated by a cylinder-reduction operation in a low speed range. The engine with the turbocharger comprises a variable valve mechanism (18) capable of adjusting the opening/closing timings and lifts of the intake and exhaust valves (only the exhaust valve (17) is shown in the figure) of each of cylinders (8). The valve opening operation of the intake and exhaust valves in a part of the cylinders (8) is disabled by the variable valve mechanism (18), and the cylinder-reduction operation is performed by only the remaining cylinders (8). The exhaust valve (17) is opened when an intake pressure is higher than an exhaust pressure in a suction stroke under the cylinder-reduction operation in the low speed range to increase the blowout amount of fresh air (intake air (4)) to the exhaust side so as to increase an apparent exhaust flow. Thus, sucking characteristics on the engine side can be improved.
摘要:
The present invention relates to a method of operating a four-stroke internal combustion engine comprising the steps of: closing an exhaust valve (16) prior to the end of the exhaust stroke to trap combusted gases in a combustion chamber (12); opening an inlet valve (15) during the intake stroke to admit charge into the combustion chamber (12) to be mixed with previously trapped combustion gases; and using an injector (60) to inject fuel into the mixture of the trapped combusted gases and the charge air. In the combustion chamber conditions are generated which enable the mixture of fuel, air and combusted gases to combust by auto-ignition. The injector (60) is additionally used to inject fuel into the trapped combusted gases after closing of the exhaust valve (16) during the exhaust stroke and prior to opening of the inlet valve (15) in the induction stroke.