A dishwasher includes a tub at least partially defining a treating chamber, a rotatable spray arm comprising an outlet, and a liquid supply conduit fluidly coupled to the spray arm. A pump can be fluidly coupled to the liquid supply conduit and operated to flow liquid through an aperture in the liquid supply conduit and through the outlet in the rotatable spray arm.

The invention relates to methods for operating a washer, and in preferred embodiments to a washer having a water tank that is integrally, preferably detachably, formed with the washer, wherein the washer comprises a washing chamber for accommodating goods to be cleaned, said washing chamber having in its lower portion a sump for collecting water during operation of the washer, a water inlet, a circulating pump for circulating water through the washing chamber, and a control unit for controlling a washing cycle carried out by the washer. In accordance with the invention, in this method water is fed via the water inlet into the sump; the pressure within an inlet or outlet conduit of the circulating pump is measured; and based on the pressure measurement the washing cycle is controlled and/or indicator signals are issued to a user of the washer.

A washing appliance comprising a tub to house items to be washed; a circulation pump (130) to circulate a washing fluid in the tub; a circulation pump motor to drive the circulation pump; a drain pump; a detection unit configured to monitor at least one electromechanical parameter of the circulation pump motor, and to detect, based on the monitored at least one electromechanical parameter, a starvation event indicating that air is drawn out by the circulation pump or a saturation event indicating that no air is drawn out by the circulation pump: a control unit configured to determine a first starvation event and a second starvation event occurred after the first starvation event, wherein the first starvation event is determined when a starvation event is detected after a first number of consecutive saturation events (N1) is counted, or after a first time interval (T1) has elapsed during which no starvation event is detected, and wherein the second starvation event is determined when a starvation event is detected before a second number of consecutive saturation events (N2) is counted after the first starvation event, or before a second time interval (T2) has elapsed after the first starvation event during which no starvation event is detected.

A washing appliance is provided, including: a tub configured to house items to be washed; an inlet valve operable to be selectively switched between an open condition for causing washing fluid to be loaded into the tub and a closed condition for preventing washing fluid be fed to the appliance; a circulation pump configured to circulate the washing fluid in the tub during a washing cycle; a control unit configured to determine an operative state of the circulation pump between a saturation state indicative that sufficient washing fluid is present in the tub to prevent air from being drawn out by the circulation pump, and a starvation state indicative that insufficient washing fluid is present in the tub to prevent air from being drawn out by the circulation pump. The control unit is further configured to receive an indication of a target speed for the circulation pump (130) and accordingly control the circulation pump by: causing a speed of the circulation pump to increase towards the target speed with a first speed increase rate; if the following two conditions a) and b) are both true: a) a starvation state of the circulation pump is determined before the speed of the circulation pump reached the target speed, and b) the inlet valve is in the open condition, causing the speed of the circulation pump to increase towards the target speed with a second speed increase rate lower than the first speed increase rate.

It is an aspect of the present disclosure to provide a dish washing machine capable of actively responding to a problem when circulation of washing water is not smoothly performed by sequentially and selectively performing a bubble removal operation, a filter blockage removal operation, and a water supply operation, and a method of controlling the same.

A method for obtaining information about a load of articles to be cleaned in a dishwasher is provided. The method may include stopping a pump from pumping liquid through a spraying system of the dishwasher at a point of time; recording a pressure signal in a sump of the dishwasher from the point of time the pump was stopped; measuring a time period, said time period being measured from the point of time the pump stopped until the pressure signal is essentially stable; and comparing the time period with reference values for obtaining information about the load in the dishwasher. A corresponding dishwasher, computer program, and computer program product may be provided.

In a method for pumping a fluid out of an aquiferous household device such as a dishwashing machine, a drain pump and a circulation pump are operated at least partially simultaneously to ensure that, in the event of an abrupt stop of the circulation pump, reverse flow that may cause filter cake formed by separating soiling and particles to loosen resulting in their re-soiling of the items to be cleaned. The speed of the circulation pump is lowered from a maximum speed to at least a minimum speed substantially without pressure surges before startup of the drain pump.

Systems and methods for detecting appliance pump cavitation or dry state are provided. An exemplary appliance can include a current measurement circuit configured to provide a feedback signal that describes an inverter current drawn by an inverter providing three-phase power to the pump motor. A control unit of an appliance can detect pump cavitation and dry state by monitoring the feedback signal. Another exemplary appliance can include a motor speed detection circuit configured to provide a motor speed signal describing the speed of the pump motor. The control unit of the appliance can monitor variance in pump motor speed to detect pump dry state or cavitation. An exemplary method includes monitoring either an inverter current used by an inverter to drive a motor or a variance in a rotational speed of the motor.

A washing appliance is provided, including a tub configured to house items to be washed; an inlet valve configured to be operated in an open condition for causing washing fluid to be loaded into the tub and in a closed condition for preventing washing fluid to be fed to the appliance; a circulation pump configured to circulate the washing fluid in the tub during a washing cycle; a control unit configured to determine an operative state of the circulation pump between a saturation state indicative that sufficient washing fluid is present in the tub to prevent air from being drawn out by the circulation pump, and a starvation state indicative that insufficient washing fluid is present in the tub to prevent air from being drawn out by the circulation pump. The control unit is further configured to receive an indication of a target speed for the circulation pump based on a user-selected washing cycle and/or on a phase of the user-selected washing cycle; control the current speed of the circulation pump based on the target speed, the inlet valve condition, the operative state of the circulation pump; operate the inlet valve based on: the target speed, the current speed of the circulation pump, and the operative state of the circulation pump.

A method of controlling the filling with water of a household appliance after treatment including activating a wash pump to a first speed, opening a load valve and starting a time counter, closing the valve and stopping the counter, calculating a flow-rate, opening and closing the valve again based on the calculated flow-rate.