| http://www.w3.org/ns/prov#value | - In a step S64, a value Cqe corresponding to an EGR flow speed is calculated by using the shown equation (Cqe={K(Pexh-Pm)}.sup.1/2 in which K is a constant) and in a step S65, an opening area of the EGR valve Aev is calculated from the shown
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