Device and a method for measuring a fluid pressure and for verifying the fluid pressure that has been measured
AssigneeLucas Automotive GmbH
InventorsKarlheinz Schaust, Klaus Ullmer, Sven Michels
Life of this patent
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Abstract
A device for measuring a fluid pressure and for verifying the fluid pressure that has been measured comprises a sensor element having a fluid chamber and an element that adjoins said fluid chamber and can be deformed under fluid pressure, a resistance bridge being arranged on the deformable element side that faces away from said fluid chamber, for the purpose of generating a transverse bridge voltage dependent on said fluid pressure. The device also comprises a voltage divider which is connected in parallel to said resistance bridge for generating a differential voltage.
Claims11
A hydraulic control unit comprising a device for measuring a fluid pressure and for verifying the fluid pressure that has been measured, wherein the device comprises:
- a sensor element which has a fluid chamber and an element which adjoins the fluid chamber and can be deformed under fluid pressure, wherein a resistance measurement bridge is arranged on that side of the deformable element which is averted from the fluid chamber, for generating a transverse bridge voltage which is dependent on the fluid pressure,
- a voltage divider which is connected in parallel to the resistance measurement bridge, for generating a differential voltage between the voltage divider which is connected in parallel to the resistance measurement bridge and the resistance measurement bridge, and
- an electronic signal processing component which is designed to alternately select the transverse bridge voltage and the differential voltage for the purpose of further processing by the electronic signal processing component, wherein the differential voltage that has been processed is used for verifying the transverse bridge voltage that has been measured and processed,
- wherein the resistance measurement bridge and the voltage divider which is connected in parallel to the resistance measurement bridge are designed such that the transverse bridge voltage and the differential voltage have a correlation which is independent of the fluid pressure.
Dependencies are inferred from the claim text.