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US 4,195,531 AGranted
Pressure detector using an averaging circuit
AssigneeNissan Motor Co., Ltd.
InventorKenji Okamura
Life of this patent
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Abstract
A pressure detector comprising a spring-loaded diaphragm mounted in a housing to define a pressure chamber to which test fluid is introduced. A pulse generating element is provided to generate an electrical pulse in response to a displacement of the diaphragm when the fluid pressure in the pressure chamber exceeds a predetermined level. An averaging circuit is connected to the pulse generating element to convert the pulses into a signal having a voltage level representative of the mean value of the pressure variation.
Claims5
A pressure detector comprising:
- a housing;
- a diaphragm in said housing to define a chamber with the walls of said housing, said chamber being in communication with a source of fluid;
- means for urging said diaphragm so that the same moves when the magnitude of the pressure of fluid in said chamber reaches a predetermined level;
- means for generating an electrical pulse in response to the movement of said diaphragm so that the duration of said pulse is proportional to the pressure of fluid in said chamber;
- and
- means for converting the electrical pulses into a voltage signal of which the magnitude is proportional to a mean value of the durations of said pulses.
3 more elements
Dependencies are inferred from the claim text.