Access variable in Ember controller

how can I access a variable in Ember controller? I've tried those methods, but it doesn't work:

import ObjectController from '@ember/controller';
export default ObjectController.extend({

  currentPhase: 1,

  init: function () {
      var selfReference = this;
      this.set("currentPhase",1);
  },

  strings: {
      title: "Title",
      phase1: "Fase " + selfReference.get("currentPhase"),
      phase2: "Fase " + currentPhase
  }
});