7 results about "Homogeneous charge compression ignition" patented technology

To obtain stable ignition and combustion by simple control, and a favorable exhaust composition.SOLUTION: An internal combustion engine which performs premixing compression self-ignition comprises a compression ratio variable mechanism which can change a mechanical compression ratio using a multi-link piston crank mechanism. The mechanical compression ratio is controlled so that the highest in-cylinder pressure crank angle θ Pmax approaches a target θ Pmax as an index indicating a combustion state. The target θ Pmax is calculated from an engine rotational speed (S1, S2) and load, and when a difference between the target θ Pmax and an actual θ Pmax is equal to or larger than a prescribed value, a compression ratio correction amount is acquired by multiplying a gain to the difference (S3, S5), and the target compression ratio is obtained by adding the compression ratio correction amount to a current actual compression ratio (S6). By the feedback control of the mechanical compression ratio, the θ Pmax is converged to the target θ Pmax.SELECTED DRAWING: Figure 2

An engine low-load emission control method and an engine, comprising: acquiring first processing parameters for removing nitrogen oxides generated by the engine under idling conditions, and a first emission amount of a target gas generated by the engine; controlling the engine to inject fuel at a reference injection time while the engine is idling, so that the engine is in a homogeneous charge compression ignition (HCCC) state, reducing nitrogen oxides in the exhaust gas and forming the target gas; electrically heating the engine's exhaust pipe, so that the target gas reaches the target temperature for catalysis, thereby catalyzing the target gas; acquiring second processing parameters related to the electricity consumption for heating the exhaust pipe, and a second emission amount of the uncatalyzed target gas; delaying the reference injection time and / or reducing the electricity consumption until the second processing parameter is less than or equal to the first processing parameter, and the second emission amount is less than or equal to the first emission amount, outputting the reference injection time as the target injection time, and outputting the target electrical parameters for electrically heating the engine's exhaust pipe.

The invention belongs to the technical field of engines, and particularly discloses an engine cylinder block structure and an operation method thereof, an engine and a vehicle, the engine cylinder block structure comprises a first cylinder and a second cylinder, a first piston is slidably connected in the first cylinder in the axial direction, and a second piston is slidably connected in the second cylinder in the axial direction; the driving assembly is used for driving the first piston and the second piston to slide; the first cylinder is provided with a sealable first air inlet hole and a sealable first air outlet hole, the second cylinder is provided with a sealable second air inlet hole and a sealable second air outlet hole, and the device further comprises a communicating assembly used for communicating the first air outlet hole with the second air inlet hole; the volume of the first cylinder is larger than that of the second cylinder. By the adoption of the scheme, the advantages of a two-stroke engine and a four-stroke engine can be integrated, the variable compression ratio is achieved, the homogeneous compression ignition acting mode of the engine is achieved, and the heat efficiency and acting efficiency of the engine are improved.

The invention discloses a combined cooling heating and power system based on SOFC (solid oxide fuel cell) hybrid power, which belongs to the technical field of hybrid power generation and comprises a solid oxide fuel cell, a vortex internal combustion engine, a homogeneous compression ignition internal combustion engine, an absorption refrigerator, a heat exchange module and a mixer. The cathode of the solid oxide fuel cell receives air and exhausts cathode tail gas, and the cathode tail gas is cooled and then sent to the absorption refrigerator to obtain chilled water; the anode of the solid oxide fuel cell receives fuel and discharges anode tail gas, the anode tail gas is heated and then sent to the homogeneous compression ignition internal combustion engine and the vortex internal combustion engine for combustion, and smoke of the homogeneous compression ignition internal combustion engine and the vortex internal combustion engine is mixed and then exchanges heat with the hot water circulation pipeline to obtain hot water. Ignition of a spark plug of the vortex internal combustion engine can accurately control the combustion time, and the problem that the combustion starting time of a homogeneous compression ignition internal combustion engine is difficult to control is solved; the power and hot water output of the internal combustion engine are flexibly controlled by adjusting the afterburning rate of the anode tail gas and the alternative fuel, and the problem that the thermoelectric output performance is reduced when the gas turbine operates under variable working conditions is solved.

The invention relates to the technical field of multi-fuel variable compression ratio homogeneous compression ignition internal combustion engines. The high-pressure common-rail air-flushing homogeneous charge compression ignition engine is characterized by mainly comprising an oil injection ignition head (1), a heat exchange disc (2), a piston (3), a combustion chamber (4), a stamping air passage (5), a stamping valve (6), a constant-pressure air rail (7), a constant-pressure valve (8), a cam shaft (9), an air inlet valve (10), an exhaust valve (11), a pressure release valve (12), a high-pressure air rail (13) and a heat exchange sleeve (14). High-pressure fuel gas in a power stroke combustion chamber (4) of the engine is stored, and when the power stroke of the engine is timed, the stored compressed gas is released back to the combustion chamber (4), and air-fuel mixed gas in the combustion chamber (4) is compressed and combusted; similarly, the combustion chamber (4) can be pressurized when the compression stroke stamping valve (6) is opened, and the pressure intensity of the combustion chamber (4) before ignition is changed by high-pressure compressed gas so as to adapt to the requirements of different fuels on the compression ratio.

To enable prompt restart in a premixed compression ignition combustion (HCCI) mode when an internal combustion engine is suspended during driving in the HCCI mode.SOLUTION: An internal combustion engine for power generation of a series hybrid vehicle includes a variable compression ratio mechanism that changes a mechanical compression ratio. During driving in an HCCI mode, when target output becomes 0 and stop of the internal combustion engine is requested (time t1), fuel supply is stopped while a target compression ratio is maintained at an HCCI target compression ratio. Since calculation of the HCCI target compression ratio and control of the variable compression ratio mechanism are continued even during the stop, the target compression ratio and an actual compression ratio are gradually raised along with lowering of a cooling water temperature and an intake air temperature. If restart is requested (time t2), when the actual compression ratio corresponds to the target compression ratio (time t3), motoring is started to reach target speed. When the target speed is reached (time t4), fuel injection is resumed.SELECTED DRAWING: Figure 5

The present invention relates to the technical field of a plunger homogeneous charge compression ignition engine. The plunger homogeneous charge compression ignition engine is characterized by comprising an internal gear (11), a secondary crankshaft gear (10), a primary crankshaft (27), a secondary crankshaft (9), a secondary crank pin (26), an engine plunger (24), and a floating bowl (7). The secondary crankshaft (9) is rotatably mounted in an eccentric shaft hole of the primary crankshaft (27), and the eccentricity of the eccentric shaft hole is the same as the rotation radius of the secondary crank pin (26). The gear ratio of the internal gear (11) and the secondary crankshaft gear (10) is 1 / 2, the internal gear (11) does not rotate, and the gear meshing makes the secondary crankshaft (9) rotate at twice the speed of the primary crankshaft (27), and rotate in the opposite direction, and the secondary crank pin (26) drives the engine plunger (24) to move linearly. When the engine plunger (24) moves to the vicinity of the top dead center, compressed air is injected into the area below the floating bowl (7) above the plunger, and the floating bowl (7) moves upward rapidly to compress the combustion chamber rapidly, so that the air-fuel mixture in the combustion chamber is compression-ignited.