摘要:
A uniflow-scavenging-type two-cycle engine (100) includes: a cylinder (110); a piston (112) that slides in the cylinder; an exhaust port (116) that is provided at a first end of the cylinder; an exhaust valve (120) that opens and closes the exhaust port; a scavenging port (122) that is provided in an inner circumferential surface of a second end of the cylinder in the stroke direction of the piston and inhales an active gas into a combustion chamber (140) in accordance with a sliding movement of the piston; a plurality of fuel injection valves (128) that inject a fuel gas to the active gas, which has been drawn in from the scavenging port to the combustion chamber, to thereby generate a premixed gas; and a fuel injection control unit (152) that varies injection directions of fuel gas injected from a part or all of the fuel injection valves (128).
摘要:
A two-stroke uniflow engine (100) is provided with: a cylinder (110); a piston (112); an exhaust valve (120) that is opened and closed in order to discharge exhaust gas that is generated inside the cylinder; a scavenging port (122) that takes active gas into the interior of the cylinder in accordance with a sliding movement of the piston; a fuel injection port (126) that is provided in the internal circumferential surface of the cylinder; a fuel injection valve (128) that injects fuel gas into the fuel injection port; and a fuel injection control unit (152) that executes control of the injection of the fuel gas in the fuel injection valve, wherein the fuel injection control unit decides at least one of an injection pressure and an injection time of the fuel injection valve based on a change in pressure inside the cylinder that is caused by a reciprocating movement of the piston.
摘要:
An object of the invention is to provide a feedback control system that calculates a P term and an I term on the basis of a deviation between a target value and a measured value of a control amount, and calculates a correction amount to be applied to an operation amount of a control subject on the basis of a PI term, which is a sum of the P term and the I term, wherein divergence of the I term in a condition where the PI term is restricted by a guard is prevented while improving a convergence property of the I term following removal of the restriction applied to the PI term by the guard. For this purpose, the feedback control system calculates, as a corrected previous value of the I term, a value obtained by subtracting a difference between a value of the PI term prior to restriction by the guard and a value of the PI term following restriction by the guard, from a value of the I term, and then updates the value of the I term by adding an update amount calculated from the deviation between the target value and the measured value of the control amount to the corrected previous value of the I term.
摘要:
Provided is a control unit (1) for an internal combustion engine (10) including a direct injector (11) directly injecting fuel into a cylinder (20) and a port injector (12) injecting fuel into an intake port (17). The control unit (1) includes an injection volume calculator (5) to calculate a volume of the fuel injected from the direct injector (11), a port injection controller (2) to control a volume of the fuel injected from the port injector (12), an overlap period controller (4) to control an overlap period during which both an intake valve (27) and an exhaust valve (28) are open, and a changer (6) to vary both the volume of the port injection from the port injector (12) and the overlap period based on the volume of the direct injection.
摘要:
The invention relates to an engine control system for an internal combustion engine (10) with a fuel injector (30), comprises a combustion fuel quantity computing means for computing a combustion fuel quantity in a combustion cycle; and a residual fuel quantity computing means for computing a residual fuel quantity in the combustion cycle based on a difference between an injection fuel quantity of the fuel injector (30) and the combustion fuel quantity.
摘要:
The amount of fuel injection is determined with higher accuracy. In an internal combustion engine provided with a variable valve mechanism capable of changing the amount of lift of an intake valve, a controlling device for controlling the amount of fuel injection has a means for detecting an actual lift amount (ALIFT) of the intake valve and feedback-controls the actual lift amount on a predetermined control cycle so that the actual lift amount converges to a target lift amount (ALCMD) at a predetermined time constant (τp). The controller calculates an estimated value (HALIFT) of the amount of lift in a subsequent control cycle by adding a value obtained by multiplying a difference between the target lift amount and the actual lift amount by a predetermined gain (C) to the actual lift amount. Then, the controlling device calculates, based on the estimated value of the amount of lift, the amount of fuel to be injected in the subsequent control cycle, where the gain is calculated based on the length of the control cycle and on the time constant above.
摘要:
A fuel supply apparatus for an internal combustion engine having a plurality of cylinders, which supplies fuel through fuel injection valves provided corresponding to the plurality of cylinders. An amount of fuel supplied to the engine is controlled by changing a fuel injection period of said fuel injection valve, and performing a fuel injection with a plurality of injection modes including a reference injection mode in which the fuel injection periods corresponding to the plurality of cylinders do not overlap with each other. A fuel injection amount parameter for controlling a valve opening period of the fuel injection valve in the reference injection mode, is calculated according to an operating condition of said engine. When the injection mode is determined to be another injection mode in which the fuel injection periods corresponding to a part or all of the plurality of cylinders overlap with each other, the fuel injection amount parameter is corrected so as to compensate shortage or oversupply of the fuel injection amount according to a correction parameter indicative of a time period which affects a pressure change of the fuel supplied to the fuel injection valve caused by employing the other injection mode.
摘要:
The invention precisely achieves an air fuel ratio control precision in each of operating regions of an engine (10), particularly a demand air fuel ratio at a time of an engine transition. In a fuel control system correcting a basic fuel amount in such a manner as to estimate a fuel adhered to an air intake pipe (13) of an engine (10) and an evaporated fuel from the adhered fuel so as to achieve a demanded air fuel ratio, a temperature of a fuel adhered portion is estimated on the basis of an amount relation between the fuel to be adhered (Fijw) and the already adhered fuel (Ffw), or a heat quantity balance. A fuel adhesion amount and a fuel evaporation amount (Ffwv) are determined on the basis of the estimated temperature.