Internal combustion engine with exhaust gas turbocharger and secondary air injection, as well as diagnosis and control of secondary air injection

摘要

The invention relates to an internal combustion engine which has a charge air charge by means of an exhaust gas turbocharger and a secondary air injection whose flow path is chosen so that the injected secondary air quantity has an influence on the rotational speed of the turbocharger. By monitoring the speed of the turbocharger caused by the secondary air injection speed increase is determined and closed from the speed increase on the flow rate of injected secondary air. DOLLAR A This has the advantage that can be dispensed with expensive temperature measuring methods, as they were previously used. Speed measurement can be carried out contactless and absolutely wear-free in particular with inductively operating speed sensors. In addition, these inductive speed sensors can be miniaturized and manufactured extremely cost-effectively.