Flowrate in a liquid chromatography precision pump (100) employs a digital control system (128) with artificial intelligence (150). In a default flow mode, pump motor speed is controlled without using real-time pressure feedback, which speed in a pressure mode is controlled using the pump system pressure point. Pressure mode is commanded by the artificial intelligence (150) when constant displacement flow measurement time is within a desired threshold and when the higher pressure piston (34a or 34B), which is used as a constant displacement flow measurement reference, is being measured. Flow mode pressure ripple is minimized by monitoring pressure points and commanding motor (18) speed change at appropriate rotation positions of a motor shaft (24) mounted cam. In pressure mode, the artificial intelligence (150) monitors for intake cycle oscillation and optimizes a highest system pressure gain dynamically. Constant flowrate proportion is provided by activating proportioning only during a constant intake flow portion of an intake cycle.