摘要:
In an internal combustion engine wherein feedback control of the air-fuel ratio is carried out in accordance with the concentration of a specific composition in the exhaust gas, so that the air-fuel ratio is close to an aimed air-fuel ratio, the atmospheric pressure is detected, and the aimed air-fuel ratio is varied in accordance with the detected atmospheric pressure.
摘要:
In an electronically controlled engine supplying fuel from a fuel injector near an intake port to an intake system, asynchronous acceleration fuel injection is carried out in relation to the secondary differential d.sup.2 X/dt.sup.2 of intake pipe pressure or intake air flow rate with respect to time t. Since the d.sup.2 X/dt.sup.2 increases rapidly and accurately after the start of acceleration of the engine, the asynchronous acceleration fuel injection can be carried out rapidly and accurately.
摘要:
A method and apparatus for performing air/fuel ratio feedback control for an internal combustion engine by comparing the results of the two comparisons; (a) comparing a determined (i.e., decision) value with a measured value detected by an oxygen sensor, and (b) comparing the determined value with a reference value, so as to determine if either is relatively large or small. Further included is an arrangement for determining whether the determined value coincides with the measured value as well as whether it coincides with the reference value, and then increasing or decreasing the determined value in accordance with the result of the determination (comparison), thereby correcting an abnormal condition of the determined (i.e., decision) value whenever the determined value is displaced from a normal condition due to injected random noise.
摘要:
In a method wherein a fuel injection time duration is allowed to perform a proportional-plus-integral action by the use of an air-fuel ratio feedback correction coefficient obtained from the output of an O.sub.2 sensor thereby to control an air-fuel ratio to a target air-fuel ratio, a correction value for allowing a mean value of the air-fuel ratio feedback correction coefficient to approach a predetermined value is varied every time the air-fuel ratio feedback correction coefficient skips a plurality of times, thereby to learn-control the air-fuel ratio of an air-fuel mixture to be a stoichiometric one.
摘要:
In an internal combustion engine having a throttle valve, a flag or switch having hysteresis characteristics using the operation of the throttle valve is provided.
摘要:
A control device determining the air-fuel ratio in the leanest fashion or in the leaner fashion depending on the position of the throttle valve. The ignition timing is also determined in relation to the air-fuel ratio. The ignition timing is advanced when the air-fuel ratio is in the leanest fashion and the ignition timing is retarded with respect to the former timing when the air-fuel ratio is in the leaner fashion. The control device further causes a delay in change-over of the ignition timing between two timing patterns relative to the change-over of the air fuel ratio when the opening of the throttle valve is changed beyond the predetermined value.
摘要:
In an internal combustion engine, the concentration of a specific composition is detected, and the fluctuation thereof is calculated. Surging in the engine is detected by comparing the calculated fluctuation with a predetermined value.
摘要:
In an internal combustion engine, feedback control of the air-fuel ratio is carried out in accordance with the concentration of a specific composition in the exhaust gas, so that the air-fuel ratio is close to a target air-fuel ratio on the lean side with respect to the stoichimetric air-fuel ratio, the target air-fuel ratio is variable in accordance with the engine temperature.
摘要:
Synchronous fuel injection amount of injected from a fuel injector in synchronization with rotation of an engine is controlled in relation to the second time differential of either the intake pipe pressure or intake flow rate.
摘要:
Disclosed is an engine having an air-fuel ratio control apparatus for obtaining various air-fuel ratios, the range of which is between the stoichiometric air-fuel ratio or lower than that ratio and the high air-fuel ratio providing a very lean air-fuel mixture. A plurality of ignition timing maps is provided, these maps having a respective order of priority determined by the air-fuel ratio. During operation of the engine, parameters substantially related to the air-fuel ratio ranges are detected, and a map having the highest order of priority is selected from the maps which meet the engine parameters. The ignition timing is calculated from the selected map.