초록 ▼

Engine speed control through variation in ignition timing of an air-fuel mixture in engine cylinders to vary engine output torque in response to current and predicted future engine speed error includes a proportional-derivative control strategy for damping engine speed oscillations, includes an addi

Engine speed control through variation in ignition timing of an air-fuel mixture in engine cylinders to vary engine output torque in response to current and predicted future engine speed error includes a proportional-derivative control strategy for damping engine speed oscillations, includes an additive combustion timing offset determined as a function of accessory load status for simplified calibration, and includes control gains determined as a function of a predicted future engine intake manifold absolute air pressure to better predict and compensate engine load changes and determined as a function of predicted future engine speed to stabilize combustion timing.

대표청구항 ▼

[ The embodiments of the invention in which a property or privilege is claimed are described as follows:] [1.] In an internal combustion engine receiving intake air in an intake manifold for distribution to at least one engine cylinder having at least one spark plug for igniting, at an ignition timi

[ The embodiments of the invention in which a property or privilege is claimed are described as follows:] [1.] In an internal combustion engine receiving intake air in an intake manifold for distribution to at least one engine cylinder having at least one spark plug for igniting, at an ignition timing, a mixture including the intake air and an injected fuel quantity, a method of varying engine output torque through ignition timing control to drive engine speed toward a target engine speed, comprising the steps of:providing a present target engine speed;providing a future target engine speed;predicting future intake manifold air pressure;sampling present actual engine speed;predicting a future engine speed;calculating present engine speed error as a difference between present target engine speed and present actual engine speed;calculating future engine speed error as a difference between future target engine speed and predicted future engine speed;referencing a minimum spark advance for best torque ignition timing command (MBT command) as a function of the predicted future engine speed and predicted future intake manifold air pressure;generating an ignition timing command as a predetermined function of the present and future engine speed errors and of the MBT command; andigniting the mixture at a timing corresponding to the generated ignition timing command to vary engine output torque.