Periodic　event-triggered　control　(PETC)　is　an　aperiodic　sampling　technique　aiming　at　reducing　the　working　time　of　the　sensors　and　the　transmissions　in　the　feedback　control　loop,　and　thus　making　it　suitable　for　wireless　networked　control　systems.　In　this　work　we　extend　the　PETC　by　introducing　asynchronous　update　and　dynamic　quantization　for　nonlinear　systems　and　study　the　stability　with　consideration　of　disturbances.　At　each　sensor　node,　a　threshold　is　computed　based　on　the　new　sampling.　Then　at　the　following　periodic　sample　time,　a　localized　event-triggered　mechanism　decides　event　base　on　whether　the　local　sampling　error　exceeds　the　threshold.　How　many　times　the　error　exceeds　the　threshold　and　the　sign　of　the　error　will　be　transmitted　to　the　controller.　In　this　way,　the　asynchronous　update　and　coarse　quantization　are　achieved.　A　similar　mechanism　can　also　be　applied　to　the　controller　to　actuator　channel　if　the　controller　has　its　own　state.　The　feasibility　of　the　approach　is　shown　via　two　examples,　including　a　smart　water　distribution　system.