Abstract:
A control device (100) for a motor (210) for a hydraulic system (200) is provided. The control device comprises at least one first sensor (120, 130) for measuring a pump pressure of the hydraulic system and a load pressure of 5 the hydraulic system, and at least on second sensor (135) for measuring at least one operating condition of at least one of the motor and a pump (220) of the hydraulic system. The control unit further comprises a processing unit (110) configured to control an rpm setting for the motor. The processing unit may control the rpm based on a difference in pressure, Δp, between the 10 pump pressure and the load pressure measured by the at least one first sensor, a predetermined preferred difference, Δp_pref, in pressure between the pump pressure and the load pressure, and at least one of the at least one operating condition.
Abstract:
Die Erfindung betrifft ein Verfahren zur Bestimmung eines Druckwertes in einem Fluidfördersystem eines Kraftfahrzeuges, mit einem ansteuerbaren elektrischen Motor und mit einer Fluidförderpumpe, die von dem elektrischen Motor antreibbar ist, wobei das Verfahren die nachfolgenden Schritte umfasst:- Bestimmen einer Drehzahl des elektrischen Motors, - Bestimmen eines Ansteuerstroms des elektrischen Motors, - Ermitteln eines Druckwertes in Abhängigkeit der Drehzahl und des Ansteuerstroms des elektrischen Motors, Verarbeitung des ermittelten Druckwertes mit zumindest einer externen Zustandsgröße in einem Steuergerät, und - Korrektur des ermittelten Druckwertes.
Abstract:
The present invention provides apparatus, including a hydronic sensorless pumping system, that features a signal processor or processing module configured to receive signaling containing information about motor readout values of power and speed, and also about pump and system characteristics equations together with empirical power equations that are constructed by a polynomial best-fit function together with pump affinity laws based upon a pump curve published by a pump manufacturer; and determine corresponding signaling containing information about a pump or system pressure and a flow rate at the motor readout values of power and speed, based upon the signaling received.
Abstract:
A machine for preparing liquid food products comprises at least: - a source of a liquid; - a delivery assembly, having a brewing chamber configured for receiving a precursor of a liquid food product and for delivering the food product following upon passage of the liquid through the brewing chamber; - a pump (4), for pumping the liquid from the supply source through the brewing chamber of the delivery assembly and thereby causing delivery of the liquid product; and - a control system, configured for controlling an electric motor (33) of the pump, which has a rotating shaft (33a). The pump (4) has a pump casing with an inlet and an outlet and a pumping arrangement that can be driven via the motor (33). The motor (33) is a bidirectional motor, and the control system comprises means for controlling reversal of the direction of rotation of the motor (33) between a primary direction and a secondary direction. The pump (4) has a priming system comprising a recirculation valve (60-63) and a corresponding actuation arrangement (44, 65, 68). The actuation arrangement (44, 65, 68) is pre- arranged for causing opening of the recirculation valve (60-63) following upon rotation of the motor (33) in the secondary direction.
Abstract:
Apparatus features a signal processor or processing module configured to respond to signaling containing information about a set point and a speed related to one or more pumps in a pump system, e.g., including a variable speed multiple pump booster system, operating at a substantially constant discharge pressure; and determine an adjustment to the set point to compensate for system friction loss and maintain the substantially constant discharge pressure of the variable speed multiple pump booster system for flow variation, based at least partly on the signaling received. The signal processor or processing module 10a provides corresponding signaling containing information to control the one or more pumps in the variable speed multiple pump booster system.
Abstract:
The present invention refers to a system for controlling the operation of an electric motor of a compressor, comprising at least one predictive speed control loop (4) constituted by at least one speed controller (41 ), at least one processing core (42) and at least one signal delay circuit (43), wherein an output signal of said predictive loop (4) is added to the output signal of the outer speed control loop (1 ). It also relates to a method for controlling the operation of an electric motor of a compressor, comprising at least one step for discretizing a first refrigeration cycle (CR1 ) into a plurality of virtual sectors (J) in accordance with a previously known sampling rate, at least one step for determining the speed correction factor in each virtual sector (J) of the first refrigeration cycle (CR1 ), at least one step for discretizing a subsequent refrigeration cycle (CR1 ) into a plurality of virtual sectors (J) in accordance with a sampling rate used in the discretization of the first refrigeration cycle (CR1 ), and at least one step for applying each speed correction factor of the first refrigeration cycle (CR1 ) in the equivalent virtual sectors (SVN) of the subsequent refrigeration cycle (CRN).
Abstract:
The present invention refers to a system for controlling the operation of an electric motor of a compressor, comprising at least one predictive speed control loop (4) constituted by at least one speed controller (41 ), at least one processing core (42) and at least one signal delay circuit (43), wherein an output signal of said predictive loop (4) is added to the output signal of the outer speed control loop (1 ). It also relates to a method for controlling the operation of an electric motor of a compressor, comprising at least one step for discretizing a first refrigeration cycle (CR1 ) into a plurality of virtual sectors (J) in accordance with a previously known sampling rate, at least one step for determining the speed correction factor in each virtual sector (J) of the first refrigeration cycle (CR1 ), at least one step for discretizing a subsequent refrigeration cycle (CR1 ) into a plurality of virtual sectors (J) in accordance with a sampling rate used in the discretization of the first refrigeration cycle (CR1 ), and at least one step for applying each speed correction factor of the first refrigeration cycle (CR1 ) in the equivalent virtual sectors (SVN) of the subsequent refrigeration cycle (CRN).
Abstract:
Embodiments to help detect operation conditions of a compressor of a TRU in real time by a genset are disclosed. The operation conditions of the compressor can be determined by monitoring a parameter pattern of the genset, such as value changes of a horsepower, a torque, an exhaust temperature, fuel consumption and/or a RPM of a prime mover of the genset, or a current drawn from a generator of the genset, over a period of time. In one embodiment, when a scroll compressor is used in the TRU, the scroll compressor may start a periodical load/unload duty cycle when the TRU reaches its setpoint. The periodical load/unload duty cycle of the scroll compressor can be detected based on a corresponding fluctuation pattern in genset parameters. When this periodically fluctuating pattern of ECU parameters and/or current drawn is detected, the prime mover can be switched to a low operation speed.