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Knock behavior in diesel-dual-fuel (DDF) engine is more complex, more severe, and different than those of traditional engines. We investigate a type of diesel-dual-fuel engines, where CNG is multipoint-injected at the intake ports as main fuel and diesel is directly injected in smaller amount, mainly for ignition purpose, resulting in lower fuel cost. Because of the mixed behaviors between the spark ignited and compression ignited engines, a more sophisticated control system is needed to properly control knock in the DDF engine. In this paper, a novel control system based on fuzzy logic is presented to regulate knock intensity at an appropriate level. The control system comprises a fuzzy controller and a fuzzy decision maker. The fuzzy controller controls several pertaining actuators using rule-base from human experience, while the fuzzy decision maker adapts the magnitude of each actuator action to various operating points.