<aura:component controller="campingController">
    <aura:handler name="init" value="{!this}" action="{!c.doInit}" />

    <aura:registerEvent name="add" type="c:enqueueEvent" />
    <lightning:button label="test" onclick="{!c.doInit}"/>
</aura:component>

doInit : function(component, event, helper) {
        var evt = component.getEvent('add');
        evt.setParams({
            actionobject:''
        });
        evt.fire();
    }

<aura:component >

    <aura:handler name="add" event="c:enqueueEvent"
        action="{!c.addInQueue}" includeFacets="true"/>
    <c:child/>
</aura:component>