Valve for controlling fluids
AssigneeRobert Bosch GmbH
InventorsWilhelm Polach, Friedrich Boecking
Life of this patent
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Abstract
A valve for controlling fluids in which the valve is actuatable by a piezoelectric actuator that acts directly on a valve member of the control valve. To compensate for changes in length of different magnitudes resulting from temperature factors, a Peltier element is incorporated into the heat flow from the piezoelectric actuator to a heat-dissipating part of the housing, and the Peltier element is triggered by an electric control unit in such a way that temperature-dictated changes in length of the piezoelectric actuator are at least partly compensated for compared with those of the housing receiving the piezoelectric actuator.
Claims21
A valve for controlling fluids, comprising a piezoelectric actuator (53), a valve member (40) which is actuatable at least indirectly, counter to a restoring force, by said piezoelectric actuator (53) which has a piezoelectric element (56) that is supported by one face end (58) in a housing (2) and that upon a change in a voltage applied to the piezoelectric element undergoes a change of length that can be transmitted by means of another face end (57) of the piezoelectric actuator to the valve member (40) in order to adjust the latter, in a heat flow from the piezoelectric actuator (53) to a heat-dissipating part of the housing, a Peltier element (62) is incorporated, which is triggered by an electric control unit (36) in such a way that temperature-dictated changes in length of the piezoelectric actuator (53) are at least partly compensated for compared with those changes in the housing (2) that receives the piezoelectric actuator.
Dependencies are inferred from the claim text.