摘要:
The heat-insulating engine with swirl chamber of this invention injects a fuel at a low pressure along the inner wall surface (21) of swirl chambers (4) having a heat-insulating structure by subsidiary nozzles (2) equipped with an accumulation chamber for accumulating temporarily the fuel from a fuel pressurization pump (22,28) and having a needle valve opened and closed electrically, from the second half of an intake stroke to a compression stroke, and then injects mainly the fuel from a fuel injection pump (23) by main nozzles (3), into the swirl chambers (4) from the second half of the compression stroke to an expansion stroke. Atomization of the fuel from the subsidiary nozzles (2) may be to such an extent that the fuel merely attaches to the wall surface (21); hence, the subsidiary nozzles (2) can be of accumulation type low pressure injection type. Accordingly, the fuel pressurization pump (22,28) itself can be made compact in size and light in weight and the cost of production can be reduced. The fuel from the subsidiary nozzles (2) is injected to the wall surface (21) of the swirl chambers (4) in the contact state so as to deprive the wall surface (21) of the heat and thus to recover the heat. Main injection is effected following the subsidiary injection and a rich mixture is generated inside the swirl chambers (4) so as to restrict the generation of NOX and to improve cycle efficiency. Furthermore, it is possible to prevent a lean mixture from diffusing into cylinders (14). since the fuel of subsidiary injection is caused to stay inside the swirl chambers (4), degradation of hydrocarbon components can be reduced.
摘要:
A crankshaft 32 is disclosed having a crankpin 70 adapted to be coupled to a variable length connecting rod assembly 34 with a rod bearing 76 disposed between the crankpin 70 and the connecting rod 76. The crankshaft 32 includes fluid passages 94, 96 for supplying pressurized fluid to respective apertures 90, 92 which communicate with the connecting rod assembly 34 so as to vary the compression ratio of the engine.
摘要:
A combustion control apparatus for an engine (1) having a variable valve timing mechanism (13a, 13b) is disclosed which is capable of varying valve timings of an exhaust valve (7) and an intake valve (6), which is adapted to establish a combustion mode to be either one of the following three modes, namely a four-cycle compression ignition combustion mode at a low and medium load area, a two-cycle spark ignition combustion mode at a high load area, and a four-cycle spark ignition combustion mode at a high speed area. Further, the apparatus establishes the valve timings of the exhaust and intake valves (7, 6) so as to form a negative overlap period in which both exhaust and intake valves (7, 6) concurrently close in the neighborhood of the exhaust top dead center (TDC), when the combustion mode is established to be the compression ignition combustion mode and establishes the valve timings of the exhaust and intake valves (7, 6) so as to carry out a gas exchange once per one revolution of the engine (1), when the combustion mode is established to be the two-cycle spark ignition combustion mode.
摘要:
A combustion control apparatus for an engine (1) having a variable valve timing mechanism (13a, 13b) is disclosed which is capable of varying valve timings of an exhaust valve (7) and an intake valve (6), which is adapted to establish a combustion mode to be either one of the following three modes, namely a four-cycle compression ignition combustion mode at a low and medium load area, a two-cycle spark ignition combustion mode at a high load area, and a four-cycle spark ignition combustion mode at a high speed area. Further, the apparatus establishes the valve timings of the exhaust and intake valves (7, 6) so as to form a negative overlap period in which both exhaust and intake valves (7, 6) concurrently close in the neighborhood of the exhaust top dead center (TDC), when the combustion mode is established to be the compression ignition combustion mode and establishes the valve timings of the exhaust and intake valves (7, 6) so as to carry out a gas exchange once per one revolution of the engine (1), when the combustion mode is established to be the two-cycle spark ignition combustion mode.
摘要:
In a heat-insulating swirl chamber engine of this invention, a fuel is injected subsidiarily from subsidiary nozzles (2) along the inner wall surfaces (16) of swirl chambers (4) of a heat-insulating structure from the second half of an intake stroke to the first half of a compression stroke, so that a lean mixture formed in the swirl chambers (4) does not diffuse into cylinders (14), deterioration of hydrocarbon components can be prevented and moreover, since the fuel comes into contact with the wall surfaces (16) of the swirl chamber, heat energy can be recovered from the wall surfaces (16). Next, the fuel is mainly injected from main nozzles (3) into the swirl chambers (4) from the second half of the compression stroke to the first half of an expansion stroke, so that the inside of the swirl chambers (4) becomes fuel-rich due to the lean mixture formed in advance in the swirl chambers (4) and the fuel by the main injection, combustion is effected in the fuel-rich state to restrict the generation of NOx and moreover, cycle efficiency can be improved because the main combustion period is shortened.
摘要:
A variable ignition type diesel-gasoline dual fuel powered combustion engine and control method can select spark ignition or compression ignition depending on the engine operating range. The variable ignition type diesel-gasoline dual fuel powered combustion engine includes a cylinder block formed of a plurality of cylinders each being connected to an air intake manifold sucking air or a gasoline fuel-mixed air and an exhaust manifold exhausting an exhaust gas after combustions; and an ECU controlling the combustion modes. The engine operating ranges are judged by the speed and load of the engine. When the range is the high load range or the low load range, a gasoline fuel combustion is performed, and when the range is between the high load range and the low load range, a diesel-gasoline dual fuel powered step is performed.
摘要:
'Flash heating' fuel management and burner firing rate modulation techniques include the provision of an apparatus and method for controlling and modulating both the fuel flow rate and fuel droplet size by precise control of fuel temperature and pressure. The heat required for 'flash heating' the fuel is supplied by heaters having known energy-input to heat-output ratios such that the fuel flow rate can be calculated based on the energy required to cause 'flash heating'. Air flow rates are calculated using a measurement of the rate of heat loss to the surrounding atmosphere through the walls of the fuel heating device. 'Flash heating' fuel management and burner firing rate modulation techniques provide improved combustion system efficiency, versatility, and robustness, and are utilized as an in-line fuel flow meter for remote monitoring of the fuel flow rates and the prediction of problems in system functionality and future system failure time frames.