System and method for adjusting an exhaust gas recirculation valve based on multiple sensor outputs

基于多传感器输出调节排气再循环阀的系统和方法

Abstract

本发明涉及基于多传感器输出调节排气再循环阀的系统和方法。提供基于最终EGR估计调节排气再循环(EGR)阀的方法和系统。在一个示例中,一种方法包括基于最终EGR流估计调节EGR阀,所述最终EGR流估计基于利用横跨EGR阀的差压传感器估计的第一EGR流、利用进气氧传感器估计的第二EGR流以及第一EGR流和第二EGR流中的每一者的精度值。所述精度值可基于在第一EGR流和第二EGR流的估计期间的发动机工况。
The invention relates to a system and method for adjusting an exhaust gas recirculation valve based on multiple sensor outputs. Methods and systems are provided for adjusting an exhaust gas recirculation (EGR) valve based on a final EGR estimate. In one example, a method may include adjusting the EGR valve based on a final EGR flow estimate, the final EGR flow estimate based on a first EGR flow estimated with a differential pressure sensor across the EGR valve, a second EGR flow estimated with an intake oxygen sensor, and accuracy values of each of the first and second EGR flows. The accuracy value may be based on engine operating conditions during estimation of the first and second EGR flows.

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