Abstract:
PROBLEM TO BE SOLVED: To provide an abnormality determination device for an internal combustion engine, which can excellently enhance detection capability for abnormality of a fuel injection valve without the need for providing a sensor detecting opening of a waste gate valve.SOLUTION: An abnormality determination device includes a fuel injection valve 26 which supplies fuel to an internal combustion engine 10, a turbocharger 20, a WGV 32 opening and closing a bypass passage 30 bypassing a turbine 20b, and an air fuel ratio sensor 34 disposed in an exhaust passage 14 downstream from the turbin 20b. When ΔA/F>α is satisfied in a normal state, the device determines that the fuel injection valve 26 is abnormal. Even when ΔA/F>α is not satisfied in the normal state, the device determines that the fuel injection valve 26 is abnormal, in a case where an air fuel ratio does not change in all cylinders evenly while the cylinders are sequentially set to a rich forcible imbalance state, and then in a case where an engine speed does not change in all the cylinders evenly while the cylinders are sequentially set to a lean forcible imbalance state.
Abstract translation:要解决的问题:提供一种用于内燃机的异常判定装置,其能够优异地提高燃料喷射阀的异常检测能力,而不需要设置废气门阀的传感器检测开口。解决方案:异常判定 装置包括向内燃机10供应燃料的燃料喷射阀26,涡轮增压器20,绕开涡轮20b的旁通通路30打开和关闭的WGV32以及排气通路14中的下游的空燃比传感器34 从涡卷20b。 当在正常状态下满足&Dgr; A / F>α时,装置确定燃料喷射阀26异常。 即使在正常状态下不满足&Dgr; A / F>α的情况下,在气缸依次设定的情况下,在所有气缸中空燃比均不变化的情况下,装置判定为燃料喷射阀26异常 然后在气缸依次设定为弱强制不平衡状态时发动机转速在全部气缸中均匀地变化的情况下。
Abstract:
PROBLEM TO BE SOLVED: To provide a control device for an internal combustion engine capable of precisely controlling an air-fuel ratio for each cylinder independently of an opening/closing state of a WGV (waste gate valve) in a multi-cylinder internal combustion engine with a supercharger having the WGV.SOLUTION: It is determined whether or not a WGV 40 is opened (steps 100 to 102). As a result, when the WGV 40 is closed, a transport lag time used in controlling an air-fuel ratio is set to a value corresponding to an exhaust path length passing through a turbine 301 (step 104). When the WGV 40 is opened, the transport lag time used in controlling the air-fuel ratio is set to a value corresponding to an exhaust path length passing through an exhaust bypass passage 38 (step 106). The cylinder corresponding to an output signal of an air-fuel ratio sensor 52 is identified on the basis of the set transport lag time, and air-fuel ratio control for feeding back the output signal of the air-fuel ratio sensor 52 to calculation of a fuel injection amount of the identified cylinder is executed (step 108).
Abstract:
PROBLEM TO BE SOLVED: To improve starting performance, and to suppress the worsening of emission characteristics even in a status that vaporized fuel to be supplied is insufficient, relating to a control device for an internal combustion engine using alcohol fuel.SOLUTION: The control device for the internal combustion engine determines whether the vaporized fuel to be supplied at start is insufficient or not (steps 200-212). As a result, cylinder fuel injection is combinedly used in the supply of the vaporized fuel when the vaporized fuel is insufficient. In this case, it is determined that a cooling water temperature Te>a predetermined water temperature Ts and an alcohol concentration E
Abstract:
PROBLEM TO BE SOLVED: To speedily supply evaporated fuel into a cylinder even at a low-temperature start for improving the starting performance in a control device of an internal combustion engine.SOLUTION: An engine 10 includes a normal fuel tank 32, an evaporated fuel tank 36, a tank ejection valve 38 and an evaporated fuel supply valve 40 or the like. At starting, an ECU 60 supplies, to a surge tank 20, the evaporated fuel stored in the evaporated fuel tank 36 during the operation of the engine. When the evaporated fuel runs short at the starting, fuel is ejected into the evaporated fuel tank 36 from the tank ejection valve 38 while the normal fuel ejection is prohibited, and the evaporated fuel supply valve 40 and an atmospheric air introduction valve 42 are opened simultaneously with the fuel ejection. Thereby, the evaporated fuel can be quickly supplied into the cylinder, not only when a sufficient amount of the evaporated fuel is stored at the starting but even when the evaporated fuel runs short.
Abstract:
PROBLEM TO BE SOLVED: To promptly supply vaporized fuel into a cylinder even at low temperature start, and to improve starting performance.SOLUTION: An engine 10 includes a normal fuel tank 32, a vaporized fuel tank 36, an in-tank injection valve 38, a vaporized fuel supply valve 40, an in-tank ignition plug 44 or the like. An ECU 60 supplies the vaporized fuel to a surge tank 20 at the start-up while accumulating the vaporized fuel during the drive of the engine in the vaporized fuel tank 36 in advance. Furthermore, when the vaporized fuel is insufficient at the start-up, the ECU first burns the vaporized fuel remaining in the vaporized fuel tank 36 by using the in-tank ignition plug 44, and then injects the fuel into the vaporized fuel tank 36 which is heated by combustion from the in-tank injection valve 38. By this arrangement, even if inevitably generating the vaporized fuel at the start-up, the vaporized fuel can efficiently be generated in a short time, and the generated vaporized fuel can promptly be supplied into the cylinder.
Abstract:
PROBLEM TO BE SOLVED: To promptly supply vaporized fuel into a cylinder even at low temperature start, and to improve starting performance.SOLUTION: An engine 10 includes a vaporized fuel tank 36, an in-tank injection valve 38, a vaporized fuel supply valve 40 or the like. An air phase chamber 36B and a liquid phase chamber 36C are formed in the vaporized fuel tank 36. An ECU 70 supplies the vaporized fuel to a surge tank 20 at the start-up while accumulating the vaporized fuel generated during the drive of the engine in the air phase chamber 36B in advance. By this arrangement, the starting performance can be improved. Furthermore, the fuel is injected from the in-tank injection valve 38 on assumption that liquid phase fuel may remain in the liquid phase chamber 36C at the generation of the vaporized fuel, and the vaporized fuel can be generated even at cold staring. Furthermore, the vaporized fuel generated in the liquid phase chamber 36C during the drive is replenished to the air phase chamber 36B, and a large volume of the vaporized fuel can be accumulated in the air phase chamber 36B as much as possible.
Abstract:
PROBLEM TO BE SOLVED: To improve startability by supplying vaporized fuel into a cylinder even at a low temperature start.SOLUTION: An engine 10 includes a normal fuel tank 32, a vaporized fuel tank 36, an in-combustion chamber injection valve 44, a vaporized fuel supply valve 46, or the like. A fuel chamber 40 and an air chamber 42 are demarcated by a free-piston 38 in the vaporized fuel tank 36. An ECU 70 supplies the vaporized fuel stored in the fuel chamber 40 during an operation of the engine to an intake path 12 upon starting. The vaporized fuel is thereby quickly supplied into the cylinder even at a low temperature start. Further, the vaporized fuel is stored in the fuel chamber 40 while being separated from the air, and the air introduced into the tank in accordance with the remaining amount of the vaporized fuel may be accommodated in the air chamber 42. Accordingly, a vapor concentration of the vaporized fuel is stabilized because air is not mixed therein upon generation of the vaporized fuel or during storage.