Diaphragm pump or diaphragm compressor and control method of diaphragm pump or diaphragm compressor

The invention relates to a diaphragm pump or a diaphragm compressor and a control method of the diaphragm pump or the diaphragm compressor. The diaphragm pump or the diaphragm compressor comprises a working chamber, a power chamber, a diaphragm piece arranged between the working chamber and the power chamber, and a motor providing driving force for the diaphragm piece. The inlet and the outlet of the working fluid are connected with the working chamber, the suction valve is arranged between the inlet and the working chamber, and the discharge valve is arranged between the working chamber and the outlet; the flywheel is arranged on a driving path from the motor to the diaphragm so as to obtain driving force from the motor and provide the driving force for the diaphragm; and the controller is configured to control the discharge valve to be opened for an eighth duration every a seventh duration in the operation process of the motor. According to the invention, large short-time power and/or large short-time power