A control unit for an electronically controlled pump unit controls the pump unit to infuse insulin into a diabetic's body in a substantially continuous way according to a preset infusion schedule as a function of time. The control unit includes an intervention unit that continuously evaluates a blood-glucose indicative input for detecting an actual or expected hypoglycaemia and executes, in response to an actual or expected hypoglycaemia, a temporary hypoglycaemia intervention. The intervention includes, for an intervention time interval, overriding the preset infusion schedule by temporarily suspending insulin infusion or temporarily reducing insulin infusion below the preset infusion schedule. The intervention unit adapts its way of operation with respect to executing the hypoglycaemia intervention in accordance with a control signal that is separate from the blood-glucose indicative input. The control unit automatically generates the control signal as a function of time and/or based on sensor input.