Abstract:
The invention relates to a method for compensating for incorrect adaptations of the precontrol of the fuel metering of an internal combustion engine that is operated in at least two operating modes, namely homogeneous normal operation and stratified charge operation. The inventive method is further characterized in that mixture control and adaptation of said mixture control takes place in the homogeneous normal operation. Depending on a desired operation, the control switches between the two operating modes, said desired operation being determined by a plurality of operating mode requirements, a priority being allocated to every operating mode requirement. The desired operation is determined depending on the priorities of the operating mode requirements. The physical urgency of the adaptation is increased by different intervals, thereby requiring a switch to the homogeneous operation.
Abstract:
An air-fuel ratio control apparatus (34) adapted for an internal combustion engine (2) equipped with a purge system (30). The air-fuel ratio control apparatus estimates the amount of fuel vapor present in a fuel tank (18) from a balance between an estimated produced vapor amount and an estimated purged amount of fuel vapor. When the estimated amount of fuel vapor present is small, the concentration of fuel vapor to be purged is low, so that a base air-fuel ratio feedback coefficient is learned in a period where the estimated value is small. As a result, the base air-fuel ratio feedback coefficient is appropriate learned. Even if the base air-fuel ratio feedback coefficient is learned incorrectly, the air-fuel ratio control apparatus can correct the feedback coefficient. Accordingly, the concentration of the fuel vapor to be purged into the intake air can be detected accurately, thus permitting the base air-fuel ratio feedback coefficient to be maintained at a more appropriate value.
Abstract:
Selon l'invention, dans un moteur à injection pour lequel la durée d'injection de base est déterminée en fonction d'un décalage et d'un gain d'une droite exprimant cette durée en fonction de la pression dans la tubulure, pour un régime donné, on interdit l'autoadaptation par modification du gain ou du décalage simultanément au débit d'une vanne de purge du canister, et on autorise l'autoadaptation respectivement en décalage ou en gain pendant au plus un nombre maximum de n1 ou n2 cycles, dans une plage de fonctionnement 1 à basse pression, ou respectivement 2 à haute pression, on n'autorise le débit de la vanne de purge qu'après l'exécution du nombre maximum de n1 ou respectivement n2 cycles, et on ne permet une nouvelle autoadaptation en gain comme en décalage qu'après exécution de tous les cycles permis en gain et en décalage. Application aux moteurs à injection avec circuit de purge de canister et autoadaptation de la richesse à partir d'une sonde λ dans les gaz d'échappement.
Abstract:
Un dispositif (14) pour adapter la courbe caractérisitque d'un régulateur de ralenti comporte un organe de validation (15) qui n'autorise l'adaptation que lorsque le signe de déviation de réglage de vitesse (DELTAn) correspond au signe de déviation de réglage de quantité d'air (DELTAQ). Grâce à ce dispositif, l'adaptation du réglage de la vitesse ne peut pas avoir d'effet contraire, ni à cause d'une adaptation insuffisante ni à cause de signaux de défaut de courant émis par l'appareil de mesure de quantité d'air (11).
Abstract:
An air/fuel ratio control system detects transition of air/fuel ratio changing between rich and lean for checking if updating condition is satisfied. Updating value is derived based on a feedback correction value which is derived for adjusting air/fuel ratio toward a stoichiomentric value. With the updating value thus derived, one of a plurality of learnt correction value which are set with respect to various engine driving range.
Abstract:
In an apparatus in which a fuel injection quantity Ti is computed by correcting a basic fuel injection quantity Tp calculated based on a parameter participating in the quantity of air sucked in an engine by a feedback correction coefficient LAMBDA set by proportional-integrating control or the like based on a signal from an air/fuel ratio sensor and the air/fuel ratio is feedback-controlled to an aimed air/fuel ratio, according to the present invention, the deviation of the feedback correction coefficient LAMBDA from the reference value during the air/fuel ratio feedback control is learned to determine a learning correction coefficient, and on computation of the fuel injection quantity Ti, the basic fuel injection quantity Tp is corrected by the learning correction coefficient and the base air/fuel ratio obtained from the fuel injection quantity computed without correction by the feedback correction coefficient LAMBDA is made in agreement with the aimed air/fuel ratio and during the air/fuel feedback control, the fuel injection quantity is computed by further correcting the air/fuel ratio by the feedback correction coefficient. In the present invention, the above-mentioned learning correction coefficient is divided into an indiscriminate learning correction coefficient K ALT for learning deviation by the change of the air density with respect to all the areas of the engine driving state mainly for correction of the deviation by the altitude and an area-wise learning correction coefficient k MAP for learning the deviation by dispersion of a part or the like for the respective area, and the fuel injection quantity Ti is computed, for example, according to the formula of Ti = Tp (LAMBDA + K ALT + K MAP ). On the other hand, under conditions where only the deviation by the change of the air density can be learned, that is, in the region where no deviation in the system is caused by the change of the throttle valve opening degree and the sucked air flow quantity is not substantially changed by the change of the throttle valve opening degree at any engine rotation number (Q flat region), the deviation by the change of the air density is indiscriminately learned and the indiscriminate learning correction coefficient K ALT is rewritten, and in the other region , the deviation by dispersion of a part is learned for the respective areas and the area-wise learning correction coefficient K MAP is rewritten.
Abstract translation:在通过校正基于通过比例积分控制等设定的反馈校正系数LAMBDA的基于参与发动机吸入的空气量的参数而计算的基本燃料喷射量Tp来计算燃料喷射量Ti的装置中, 根据本发明,根据空气/燃料比传感器的信号,空气/燃料比被反馈控制到目标空燃比,反馈校正系数LAMBDA与空气中的参考值的偏差 学习燃料比反馈控制以确定学习校正系数,并且在计算燃料喷射量Ti时,通过从燃料喷射量获得的学习校正系数和基本空气/燃料比来校正基本燃料喷射量Tp 通过反馈校正系数LAMBDA进行校正而计算,与目标空燃比一致 r /燃料反馈控制,通过反馈校正系数进一步校正空燃比来计算燃料喷射量。 在本发明中,上述学习校正系数被分为用于通过空气密度相对于发动机驱动状态的所有区域的变化来学习偏差的不加区别的学习校正系数KALT,主要用于校正偏差 高度和面积学习校正系数kMAP,用于通过对各个区域的部分等的分散来学习偏差,并且燃料喷射量Ti例如根据下式计算:Ti = Tp(LAMBDA + KALT + KMAP)。 另一方面,在只能够知道由空气密度变化引起的偏差的条件下,即在节气门开度和吸气流量的变化不会引起系统偏差的区域 任何发动机转数(Q平坦区域)的节流阀开度的变化基本上不会改变量,空气密度的变化的偏差被不加区分地学习,并且不加区别的学习校正系数KALT被重写,并且在 对于各个区域,对于各个区域学习部分的偏差偏差,并且重写区域学习校正系数KMAP。
Abstract:
The present invention is provided with: a NOx occlusion/reduction catalyst 32 which is provided to an exhaust passage 13 of an internal combustion engine 10, occludes NOx in exhaust when in the exhaust is in a lean state, and reduces and purifies occluded NOx when the exhaust is in a rich state; a NOx purging control unit 60 which, when the exhaust is in the rich state, executes NOx purging in which the NOx occluded in the NOx occlusion/reduction catalyst 32 is reduced and purified; and a NOx-purging-prohibition processing unit 70 which, in cases when at least one of a plurality of prohibition conditions is fulfilled, prohibits execution of catalyst regeneration processing by the NOx purging control unit 60 even if a catalyst-regeneration-processing start request has been issued, and, in cases when a specific prohibition condition, i.e. one of the plurality of prohibition conditions, is fulfilled during execution of the catalyst regeneration processing, invalidates the prohibition condition and allows execution of the catalyst regeneration processing by the NOx purging control unit 60 to continue.
Abstract:
[Problem] To provide a control device for internal combustion engine with which an execution of a learning of an injection amount of fuel at a highland is prevented. [Solution] A control device for an internal combustion engine mounted on a vehicle includes a fuel injection control portion that controls a fuel injecting valve that injects fuel into a cylinder of the internal combustion engine, a learning portion that learns an injection amount of the fuel injected from the fuel injection valve, an altitude measuring portion that measures an altitude of a position where the vehicle travels; and a learning determining portion that determines whether to execute the learning based on the altitude, wherein when the altitude is equal to or higher than a predetermined learning prohibition altitude, the learning determining portion determines not to execute the learning.