Abstract:
Provided is a control apparatus, which can successfully suppress that deterioration of combustion is caused in response to inflow of a large amount of blow-by gas to cylinders at the time of a valve return from a valve stop state in an internal combustion engine including a positive crankcase ventilation system and a variable valve operating mechanism that is capable of stopping at least one valve of an intake valve and exhaust valve in a closed state. A valve stop control is performed which stops the intake valve and exhaust valve in a closed state when a fuel cut of the internal combustion engine is executed. A deviation amount ΔA/F between a predetermined target air fuel ratio and an actual air fuel ratio detected by an A/F sensor at the time of a valve return is obtained. A correction is performed to decrease a fuel injection amount by a fuel amount equivalent to the deviation amount ΔA/F at the time of the subsequent valve returns.
Abstract:
An object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine which can properly purge at least NOx of unpurified components contained in exhaust gas while considering characteristics of NOx desorbed from an adsorbent. A bypass passage 18 bypassing a main exhaust passage 12 of the internal combustion engine 10 is provided. A HC/NOx adsorbent 22 having a function of adsorbing HC and NOx is provided in the bypass passage 18. A second underfloor catalyst 30 is provided downstream of the adsorbent 22. A purge passage 26 branching off from the bypass passage 18 while connecting to an intake passage is provided. An exhaust switching valve 20 and a purge control valve 28 are provided as a flow path switching means that is capable of switching a flow target into which the exhaust gas flows between the main exhaust passage 12 and the bypass passage 18. If the purging operations are executed, the intake purging operation is first executed. After that, the intake purging operation is switched to the exhaust purging operation at a timing existing after the purge of NOx is completed and at the time point at which the temperature of the adsorbent becomes stable.
Abstract:
An exhaust gas control apparatus (100) of an internal combustion engine (200) of a vehicle, which is provided with: the internal combustion engine which can use fuel containing methane in exhaust gas; an exhaust gas purifying apparatus (300) disposed in an exhaust passage of the internal combustion engine; an EGR passage (400) which can recirculate the exhaust gas to an intake passage of the internal combustion engine, in a HPL path which does not include the exhaust gas purifying apparatus; and an adjusting device (407) which can adjust an exhaust gas recirculation amount in the EGR passage, is provided with: a first specifying device for specifying a methane concentration in the exhaust gas; and a first controlling device for controlling the adjusting device to increase an exhaust gas recirculation amount in the HPL path if the specified methane concentration is greater than or equal to a reference value.
Abstract:
The present invention has its object to provide a control apparatus for an internal combustion engine including a variable valve operating mechanism which is capable of accurately and effectively identifying an abnormality-occurring cylinder during operation while preventing the deterioration of a catalyst. A fuel injection valve which is capable of injecting fuel for each cylinder is provided. Variable valve operating mechanisms which are capable of halting the operation of the intake and exhaust valves in the closed state for each cylinder are provided. An abnormality evaluation index value is acquired during the operation of the internal combustion engine and, based on the abnormality evaluation index value, an abnormality which has occurred in at least one cylinder in the internal combustion engine is detected. When the abnormality is detected, a cylinder halting to perform the halting of fuel supply and the halting of the valve operation in the closed state is executed with a first partial cylinder made up of at least two cylinders as the target. After the cylinder halting, with the cylinder to be halted being changed, a cylinder halting is executed with a second partial cylinder made up of at least one cylinder as the target. Based on the change in the abnormality evaluation index value associated with the changing of the cylinder to be halted, the abnormality-occurring cylinder is identified.
Abstract:
A moisture adsorbing device 1 comprising a type Y zeolite, and an NOx adsorbing device 2 being put in place on an exhaust-gas downstream side of the moisture adsorbing device 1, and comprising a zeolite that includes a transition metal ion in the cation exchange sites are included. In NOx adsorbing apparatuses, since the less the moisture content in exhaust gases is the more the NOx adsorbing capability improves, the NO adsorbing capability in low-temperature region is improved especially by means of the combination with a moisture adsorbing device that comprises a type Y zeolite whose Al2O3 proportion is great and whose moisture adsorbing amount is great compared with the other zeolites.
Abstract:
Provided is a control apparatus, which can successfully suppress that deterioration of combustion is caused in response to inflow of a large amount of blow-by gas to cylinders at the time of a valve return from a valve stop state in an internal combustion engine including a positive crankcase ventilation system and a variable valve operating mechanism that is capable of stopping at least one valve of an intake valve and exhaust valve in a closed state. A valve stop control is performed which stops the intake valve and exhaust valve in a closed state when a fuel cut of the internal combustion engine is executed. A deviation amount ΔA/F between a predetermined target air fuel ratio and an actual air fuel ratio detected by an A/F sensor at the time of a valve return is obtained. A correction is performed to decrease a fuel injection amount by a fuel amount equivalent to the deviation amount ΔA/F at the time of the subsequent valve returns.
Abstract translation:提供一种控制装置,其能够成功地抑制在内燃机中从阀停止状态返回时响应于大量的窜缸气体向气缸的流入而引起燃烧劣化,所述内燃机包括 正曲轴箱通风系统和能够在关闭状态下停止进气门和排气阀的至少一个阀的可变气门操作机构。 当执行内燃机的燃料切断时,执行阀停止控制,该停止控制将进气门和排气门停止在关闭状态。 获得在阀返回时由A / F传感器检测到的预定目标空燃比与实际空燃比之间的偏差量&Dgr; A / F。 执行校正,以通过与随后的阀返回时的偏差量&Dgr; A / F相当的燃料量来减少燃料喷射量。
Abstract:
A moisture adsorbent (32) for adsorbing moisture in exhaust gas and an NOx adsorbent (34) for adsorbing NOx are disposed in a bypass passage (30) for bypassing an exhaust passage (16) of an internal combustion engine (10). When an adsorption operation to the NOx adsorbent (34) is executed, inflow of the exhaust gas to the bypass passage (30) is allowed until the moisture amount that flows into the water adsorbent (32) reaches an allowable moisture inflow amount. The allowable moisture inflow amount is determined based on a residual moisture amount before the starting of the adsorption operation in the moisture adsorbent (32). The residual moisture amount in the water adsorbent (32) can be determined based on the temperature of the moisture adsorbent (32) at the immediately preceding execution of the purge operation.
Abstract:
A main exhaust passage 42 and a first bypass passage 46 bypassing the main exhaust passage 42 are provided. An absorbent 52 having a function of absorbing HC components and NOx components contained in exhaust gas is provided in the first bypass passage 46. An underfloor catalyst 56 including a catalyst with an electric heater (EHC) 58 is provided in a main exhaust passage 42 on a downstream side of a downstream connecting portion 48b in a first bypass passage 46. A second bypass passage 62 that provides communication between the main exhaust passage 42 downstream of the underfloor catalyst 56 and the first bypass passage 46 upstream of the absorbent 52 is provided. A first exhaust switching valve 50 is provided in an upstream connecting portion 48a, and a second exhaust switching valve 68 is provided in a main exhaust passage side connecting portion 64a. A pump 66 is provided in the middle of the second bypass passage 62.
Abstract:
An object of the present invention is to provide an exhaust gas purifying apparatus for an internal combustion engine which can properly purge at least NOx of unpurified components contained in exhaust gas while considering characteristics of NOx desorbed from an adsorbent. A bypass passage 18 bypassing a main exhaust passage 12 of the internal combustion engine 10 is provided. A HC/NOx adsorbent 22 having a function of adsorbing HC and NOx is provided in the bypass passage 18. A second underfloor catalyst 30 is provided downstream of the adsorbent 22. A purge passage 26 branching off from the bypass passage 18 while connecting to an intake passage is provided. An exhaust switching valve 20 and a purge control valve 28 are provided as a flow path switching means that is capable of switching a flow target into which the exhaust gas flows between the main exhaust passage 12 and the bypass passage 18. If the purging operations are executed, the intake purging operation is first executed. After that, the intake purging operation is switched to the exhaust purging operation at a timing existing after the purge of NOx is completed and at the time point at which the temperature of the adsorbent becomes stable.
Abstract:
The present invention relates to an exhaust emission control device having an NOx adsorbent, and makes it possible to judge whether the performance of the NOx adsorbent is degraded temporarily or permanently. The amounts of NOx and water adsorbed by the NOx adsorbent are measured during an actual operation of an internal combustion engine. A reference line indicating the correlation between a preselected water adsorption amount and NOx adsorption amount is then referenced to determine a reference value y0 of the NOx adsorption amount that corresponds to a measured value x1 of the water adsorption amount. Next, a measured value y1 of the NOx adsorption amount is compared against the reference value y0 to output a signal in which the result of the comparison is reflected.