Patent ID: 7861943

Claim:
Adaptive piezoelectric actuator control system for a liquid droplet spray device, the system comprising: (a) power supply means; (b) a piezoelectric actuator; (c) a driver operably connected to drive said piezoelectric actuator so as to activate said liquid droplet spray device; (d) a signal generator operably connected to provide a frequency signal to said driver for driving said piezoelectric actuator at a frequency as defined by said frequency signal; (e) a user interface that allows a user to input operating conditions of said liquid droplet spray device; (f) memory means for storing internal parameters and external parameters of said piezoelectric actuator; and (g) system control means operably connected to control said power supply means, said driver, said signal generator and said memory means so that the operating frequency of said piezoelectric actuator is monitored and regulated in time so that said piezoelectric actuator operates correctly while consuming as little power as possible, wherein said driver comprises i. test signal means operably connected to provide a test signal to said piezoelectric actuator, wherein said test signal is provided by said signal generator; and ii. voltage measurement means operably connected to measure a voltage applied to said piezoelectric actuator caused by said test signal, and to measure a voltage applied to said piezoelectric actuator caused by said frequency signal, wherein said system control means receives a response signal in response to said test signal, and receives said voltages measured by said voltage measurement means, and said system control means comprises signal analysis means for creating an envelope of said response signal and that controls said signal generator to generate a frequency signal corresponding to a maximum of said envelope.