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US 4,393,715 AGranted
Absolute pressure pick-up, especially for measuring pressure at intake in internal combustion engines
AssigneeRegie Nationale des Usines Renault
InventorClaude Lombard
Life of this patent
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Abstract
Disclosed is an absolute pressure pick-up for the intake in an internal combustion engine. The pick-up consists of a screened magnetic circuit equipped with a mobile core placed inside an elastic bellows. A chamber (4) that receives either the pressure to measure or the reference vacuum is around the bellows.
Claims3
A pressure pick-up comprising:
- a sealable rigid cylindrical envelope having two ends;
- a fluid tight elastic bellows in said envelope and having one end attached to one of said ends of said envelope;
- biasing means associated with said bellows for expanding said bellows;
- a ferrite screened magnetic circuit in said bellows;
- a mobile ferrite core in said circuit and fixed to the other end of said bellows;
- a single induction coil within said circuit, said coil having two ends extending out of said envelope;
- means for applying a fluid pressure in said envelope and only on the outside of said bellows;
- and
- means for providing a fluid tight seal for said envelope at points where said two ends exit said envelope.
6 more elements
Dependencies are inferred from the claim text.