CONTROL DEVICE AND CONTROL METHOD OF INTERNAL COMBUSTION ENGINE

摘要

In a case where a driving state is switched from a high load to a low load in a non-turbo charge region and an external EGR is stopped, at a timing T01 at which an EGR control valve (21) is closed, a valve overlap quantity between an intake valve and an exhaust valve is, as a low load transient time provisional value, controlled in a direction such that the valve overlap between the intake and exhaust valves is once contracted. Then, a target value of the valve overlap quantity between the intake and exhaust valves at a timing T21 preceded by a response time Δt of the variably operated valve mechanism (28) from a timing T31 at which the opening angle of the EGR control valve (21) is modified from the low load transient time provisional value to the target value at the time of the low load.

主权项

1. A control apparatus for an internal combustion engine, comprising:
a turbo charger located at an upstream side of a throttle valve; an EGR passage through which a part of exhaust gas is re-circulated in a form of EGR toward a more upstream side than the turbo charger; an EGR control valve disposed in a midway through the EGR passage; EGR rate predicting means for anticipating and predicting a variation of an EGR rate within a cylinder of the internal combustion engine developed by a modification of an opening angle of the EGR control valve; and a valve timing control device modifiable a valve timing of an engine valve, wherein the valve timing control device is controlled on a basis of a prediction by the EGR rate predicting means and an internal EGR gas quantity is adjusted in order for the EGR rate within the cylinder to become a target EGR rate, wherein the EGR rate predicting means predicts an EGR rate at a predetermined position of an intake system which is more downstream side than a junction section between the EGR passage and an intake passage, and wherein the predetermined position is modified in accordance with a time duration from a time at which the target value of the valve timing control device is modified to a time at which the valve timing of the engine valve is varied.