Patent ID: 8571769

Claim:
Control method to control a position of a solenoid valve using dithering, the control method comprising: determining a target current (I OBJ ), through the solenoid valve, that is expressed in digital form with a given minimum quantization interval (Δ min ); adding to the target current (I OBJ ) a dithering square wave (I DITH ) that has a high frequency of oscillation; controlling a voltage (V) applied to the solenoid valve to urge a current (I) through the solenoid follow the target current (I OBJ ) added to the dithering square wave (I DITH ); jiggling the dithering square wave (I DITH ) with a frequency that is a sub-multiple of a frequency of variation of the current (I) through the solenoid valve; and varying the amplitude of the dithering square wave (I DITH ) for a fraction of a period (T DITH ) of the dithering square wave (I DITH ).