摘要:
An ignition timing control system of the vehicle internal combustion engines which conducts ignition timing control retard adjustment during vehicle acceleration so as to eliminate vibration of the vehicle body caused by the sudden change in the engine output. When the vehicle acceleration is detected, the ignition timing is immediately retarded for a period and after the expiration of the period, the retard adjustment is continued so long as the engine speed increases and discontinued when the engine speed turns to decreases. As a result of the repeated ignition timing control, the overall ignition timing characteristics take on a zigzag pattern. The ignition timing is thus controlled to reduce the output torque when the torque tends to rise because the engine speed is rising, while the retard correction is discontinued so as to prevent a decrease in output torque when the engine output torque tends to decline. As such, by deliberately imparting a phase difference to the output, the change in the engine speed is averaged to result smooth rising during acceleration without causing the vibration to the vehicle body.
摘要:
An ignition timing control system for an internal combustion engine in which an ECU sets a basic spark advance value in response to operating condition of the engine, corrects the set basic spark advance value, and delimits the corrected spark advance value in a spark retarding direction by means of a retard limiting value. The ECU further detects operating conditons of a valve timing changing system which changes the valve timing of at least one of an intake valve and an exhaust valve of the engine, and is responsive to the detected operating conditions of the valve timing changing system for changing the retard limiting value, e.g. in such a manner that when low-speed valve timing is selected, the retard limiting value is changed toward an advanced side relative to a value thereof set when high-speed valve timing is selected.
摘要:
This fuel efficiency display device for a fuel cell vehicle includes: a first interval vehicle efficiency obtaining device which obtains a first interval vehicle efficiency being a fraction of a generated traveling energy with respect to a consumed fuel amount in a predetermined first time-interval; a second interval traveling energy obtaining device which obtains a second interval traveling energy being a traveling energy generated in a predetermined second time-interval which is shorter than the first time-interval; and a second interval fuel efficiency obtaining device which obtains a second interval fuel efficiency being a fuel efficiency in the second time-interval, based on at least the first interval vehicle efficiency and the second interval traveling energy.
摘要:
An evaporative fuel-processing system for an internal combustion engine has an evaporative emission control system. An ECU carries out negative pressurization of the interior of the evaporative emission control system, by opening a purge control valve and closing a vent shut valve, and determines presence/absence of leakage from the evaporative emission control system, based on a rate of decrease in negative pressure within the system, by closing a purge control valve. Before the negative pressurization, the interior of the evaporative emission control system is opened to the atmosphere, and during the open-to-atmosphere, a pressure state within the fuel tank is estimated based on a rate of change in an output from a pressure sensor which senses pressure within the evaporative emission control system. The ECU determines whether the evaporative emission control system is normal, based on the estimated pressure state.
摘要:
A fuel injection control system for an internal combustion engine includes an ECU which carries out adherent fuel-dependent correction by calculating an amount of fuel to be injected into the intake passage such that a sum of a direct supply amount of fuel directly drawn into the combustion chamber of the engine without adhering to the wall surface of the intake passage out of a whole amount of fuel injected into the intake passage, and a carried-off amount of fuel carried off the wall surface of the intake passage into the combustion chamber out of fuel adhering to the wall surface of the intake passage is equal to a required fuel amount for the engine. The starting condition of the engine is detected by sensors, and operation of the adherent fuel-dependent correction control is limited during the starting condition of the engine. The carried-off fuel amount is set to a predetermined value, based on at least one operating parameter of the engine when the engine has shifted from the starting condition to the basic operating condition after starting.
摘要:
A device for detecting abnormality of the fuel supply system of an internal combustion engine inhibits supply of evaporative fuel to the intake passage when the air-fuel ratio correction coefficient becomes smaller than a predetermined value, and thereafter determines that the fuel supply system is normal when the air-fuel ratio correction coefficient increases above the predetermined value as a result of the inhibition of the supply of the evaporative fuel. The supply of the evaporative fuel to the intake passage is resumed after the determination that the fuel supply system is normal has been made. Determination of abnormality of the fuel supply system is inhibited after resuming of the supply of the evaporative fuel until the engine enters a predetermined operating condition in which the air-fuel ratio correction coefficient has increased. The determination of abnormality of the fuel supply system is permitted to be resumed, based on the air-fuel ratio correction coefficient when the engine has entered the predetermined operating condition.
摘要:
An evaporative fuel-purging control system for an internal combustion engine, which controls purging of a mixture of evaporative fuel from a fuel tank and air comprises a purge control valve arranged across a purging passage for controlling the flow rate of evaporative fuel from the fuel tank to an intake passage. The flow rate of evaporative fuel is detected and compared with a desired flow rate commensurate with an operating condition of the engine. The valve opening of the purge control valve is controlled in response to results of the comparison. The change rate of the valve opening is varied according to the concentration of evaporative fuel in the mixture. Specifically, the change rate is decreased as the evaporative fuel concentration is higher.
摘要:
A control system for internal combustion engine installed in vehicle with automatic transmission which lowers the engine output torque for reducing the shock apt to be felt by the passengers of a vehicle equipped with an automatic transmission at the time of shifting gears. The clutch speed ratio between the transmission input and output shafts is calculated to compare with a first value. If the ratio goes beyond the first value, engine output torque is reduced by a first amount. Then the ratio is compared with a second value and if the ratio comes within the second value, the torque is further reduced by a second amount which is greater than the first amount. The ratio is continuously calculated and is again compared with a third value. When the ratio comes within the value, the torque is restored to the first reduction amount. The ratio is finally compared with the fourth value and if it comes within the value, the torque is fully restored to the initial state. Thus, the gear shift shock is avoided and as a secondary effect, clutch wear is reduced.
摘要:
An intake air amount control system for an internal combustion engine includes a control valve for regulating the amount of intake air supplied through the intake pipe to the engine. An ECU determines the difference between a desired idling rotational speed of the engine and an actual rotational speed of same and feedback-controls the control valve by means of a control amount responsive to the determined difference such that the actual rotational speed becomes equal to the desired idling rotational speed. The ECU learns a reference value of the control amount by calculating an average value of values of the control amount applied during the feedback control. The ECU inhibits the learning of the reference value of the control amount when the difference between atmospheric pressure and absolute pressure within the intake pipe is smaller than a predetermined value.
摘要:
An air-fuel ratio feedback control method for an internal combustion engine, in which when the engine is operating in a feedback control region, the air-fuel ratio of an air-fuel mixture being supplied to the engine is controlled by the use of a correction coefficient varying in response to the output of an exhaust gas ingredient concentration sensor arranged in the exhaust system of the engine. When the engine has shifted to a predetermined high load region within the feedback control region, in which the rate of change in values of an engine operating parameter is larger than a predetermined value, the air-fuel ratio feedback control is effected by the use of a first average value of the correction coefficient, calculated when the engine is in the predetermined high load region. When the engine has shifted to a second predetermined region within the feedback control region other than the predetermined high load region, the feedback control is effected by the use of a second average value of the correction coefficient, calculated in the second predetermined region, in a manner different from that of calculating the first average value.