Nissan Motor Company Limited

Yasutoshi Nanyoshi

Katsunori Oshiage

Toshio Matsumura

Tatsuo Morita

Hiroshi Komatsu

Hideo Nakamura

Sadao Takase

Hidetoshi Shigyo

A fuel injection control system derives a target fuel amount to be introduced into a combustion chamber of an internal combustion engine in each induction stroke in the engine revolution cycle, according to an engine driving condition for establishing a desired air/fuel ratio of an air/fuel mixture in the combustion chamber. The target fuel amount is modified with a fuel transferrring characteristics dependent correction value which is derived as the reverse of a fuel transferring characteristic when the injected fuel amount coincides with the fuel amount introduced into the combustion chamber. The fuel injection amount for actual fuel injection is thus derived so that the injected fuel amount coincides with the modified target fuel amount.

Fuel injection control system for internal combustion engine with

A fuel injection control system assumes fuel amount introduced in an engine combustion chamber on the basis of an air/fuel ratio dependent value derived by monitoring an air/fuel ratio dependent component in an exhaust gas, and an intake air amount introduced into the combustion chamber, assumes wetting fuel amount to be consumed for wetting an induction system on the basis of the fuel amount introduced into the combustion chamber and a fuel injection amount injected up to the immediately preceding fuel injection cycle, and prospect fuel amount to be introduced into the combustion chamber on the basis of the current fuel injection amount and the wetting fuel amount. The prospected fuel amount to be introduced into the combustion chamber is compared with a target fuel amount which is derived according to the engine driving condition for modifying the fuel injection amount so that the prospected fuel amount coincides with the target fuel amount.

A system and method for controlling combustion state for an internal combustion engine during engine idling which measures the angular speed of the engine cylinders for a certain interval whenever a predetermined crank angle is reached, and detects a combustion state of a given cylinder in the combustion stroke when the engine is idling according to change in the angular speed. The system (method) also divides the engine cylinders into a plurality of cylinder groups, each group having a pair of engine cylinders, the angular speeds in each pair of engine cylinders (cylinder group) are compared and the ignition timing and/or fuel injection quantity is corrected so that the angular speed of the pair of cylinders (cylinder group) which is higher than that of the other cylinder groups is reduced and, for the pair of cylinders in which the angular speed is slower, corrects the ignition timing and/or fuel injection quantity in the reverse direction to the corrected ignition timing and/or fuel injection quantity by the same quantity so that balance between the angular speeds of the pairs of cylinders is taken, whereby the ignition timing and fuel injection quantity is corrected so that a total sum of the correction quantities for all cylinders in the case of the ignition timing and/or fuel injection quantity always becomes zero.

System and method for controlling a combustion state in a multi-cylinder

An engine combustioning condition monitoring system monitors crankshaft angular position for detecting an engine cylinder in combustion cycle. The system derives variation of velocity of a crankshaft revolution on the basis of the monitored crankshaft angular positions and derives a combustioning coefficient for each engine cylinder. A value representative of the variation of the crankshaft revolution velocity is modified by the combustioning coefficient for deriving internal pressure in each engine cylinder. Discrimination of the engine combustioning conditon is made on the basis of the engine cylinder internal pressure.

Combustioning condition monitoring system for internal combustion engine

A fuel injection control system performs fuel cut-off operation intermittently so that engine output torque may not fluctuate at significant level to cause jerking at the transition from fuel injecting state to fuel to fuel cut-off state and at fuel resumption after fuel cut-off. Intermittnetly cutting off the fuel delivery for the engine cylinders, engine output torque drop at the fuel injecting state and fuel cut-off state can be reduced for reducing magnitude of jerking.

Fuel injection control system for internal combustion engine with fuel

In order to compensate for the effect of a by-pass passage which by-passes air about the engine throttle valve when a predetermined vacuum prevails downstream thereof, or the delay in air flow within the induction system in response to the demand for engine power, a target torque value is derived based on the engine speed and the accelerator pedal depression amount and this value is used in connection with one or both of the fuel supply and the air flow control. In some embodiments two basic injection pulses are developed and one is selected to suit the instant induction conditions. In other embodiments, selectively delayed target torque values are used to individually modify the throttle valve control and injection fuel supply amount.

Air and fuel control system for internal combustion engine

An apparatus for controlling an internal combustion engine having a plurality of cylinders and fuel injectors provided to inject fuel in a sequential fashion for the respective cylinders. Fuel injection is made twice from a given fuel injector. The control circuit calculates a first value for the amount of fuel injected from the fuel injector during the first fuel injection and a second value for the amount of fuel injected from the fuel injector during the second fuel injection. During transition of the engine operation, an engine load variation is produced between the times at which the first and second values are calculated. A correction factor is calculated based on the engine load variation with an estimation of a first value to be calculated for the cylinder when the fuel injected during the first and second fuel injections is charged in the cylinder.

Fuel control apparatus

An apparatus for controlling a multi-cylinder type internal combustion engine including first and second cylinder groups each includinhg at least one cylinder. The apparatus comprises sensors for generating electrical signals indicative of engine operating conditions including engine speed, and a control circuit coupled to the sensors for determining an appropriate value repetitively at uniform intervals. This calculation is made according to the engine operating conditions. A fuel supply device is coupled to the control circuit for supplying fuel to the first and second cylinder groups in an amount corresponding to the calculated value. The control circuit operates the fuel supply device to alternatively terminate the fuel delivery to the first cylinder group and the fuel delivery to the second cylinder group under an overspeed condition.

Apparatus for controlling fuel delivery to engine

A system and method for controlling an ignition timing for an internal combustion engine mounted in a vehicle are disclosed in which a limit value for the ignition timing value is provided so that a difference between a current ignition timing and a previous ignition timing is within the limit value and the limit value is set according to a magnitude of an engine acceleration. For example, when an abrupt engine acceleration occurs, the limit value is set to 15 degrees. When the engine is in a steady state (no abrupt acceleration from an idling condition), the limit value is set to four degrees. Therefore, no vehicle body shock occurs due to the abrupt change in an engine output torque caused by the abrupt change in the ignition timing and a response characteristic of a rise in the engine output torque during the abrupt acceleration can be assured.

System and method for controlling ignition timing for internal

A fuel injection control system performs fuel injection for each engine cylinder at mutually different timings in each engine revolution cycle. First and former fuel injection is take place at a timing well advanced in view of a timing of opening of an intake valve of the corresponding engine cylinder to inject full amount of fuel derived on the basis of an engine load and engine speed. Second fuel injection is performed at a timing close to or within the intake valve open period for injecting an amount for compensating fuel amount to be increased depending upon increase of the engine load. In addition, acceleration enrichment upon engine acceleration demand is taken place by adjusting the fuel injection amount for second fuel injection.

An apparatus for controlling the amount of fuel supplied to the engine and the timing of the sparks supplied to the engine. The apparatus reads an engine load sensor at time intervals. A read value of engine load is used in determining the amount of fuel required for one cylinder of the engine. This engine load value is also used in determining the spark timing required for the one cylinder.

Engine control apparatus

A control system for injecting fuel twice in each operating cycle of an internal combustion engine is provided with a control unit which comprises a first section for determining a desired injection quantity in accordance with an engine load and other engine operating parameters, a second section for determining a first fuel injection quantity from a recent value of the desired quantity and commanding the first injection, a third means for determining a compensation fuel quantity for compensating for a change of the desired quantity after the first injection by subtracting a more recent value of the desired quantity from the recent value used for determining the first injection quantity, and a fourth section for determining a second fuel injection quantity from the compensation quantity.

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Kanagawa, Japan

Yasutoshi Nanyoshi