FUEL-ASPECT SENSOR
First Claim
1. A fuel-aspect sensor comprising:
- a first housing member having a fuel chamber through which fuel flows and an insertion hole for communicating the fuel chamber with outside of the first housing member;
a first electrode inserted into the insertion hole from an open end of the insertion hole, the first electrode having an inside space being in communication with the fuel chamber;
a second electrode having a closed bottom portion, a lower part of the second electrode being accommodated in the inside space of the first electrode, so that an outer surface of the second electrode is exposed to the fuel introduced into the inside space of the first electrode;
an insulating member for electrically insulating the first and second electrodes from each other and for firmly fixing the first and second electrodes to each other;
a temperature sensor accommodated in the second electrode and fixed to an inside surface of the closed bottom portion thereof;
a second housing member firmly attached to the first housing member for closing the open end of the insertion hole of the first housing member;
an electronic control unit accommodated in the second housing member and electrically connected to the first electrode, the second electrode, and the temperature sensor, for detecting electrostatic capacity between the first and second electrodes; and
an elastic member disposed between the second housing member and the first electrode for biasing the first electrode toward a sealing surface of the first housing member, which is formed at an inner wall of the insertion hole so as to oppose to the open end of the hole.
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Accused Products
Abstract
An object of the invention is to provide a fuel-aspect sensor having higher detection accuracy. A first electrode is inserted into a hole formed in a first housing member. A cylindrical second electrode is inserted into and firmly fixed to the first electrode by a cylindrical insulating member. A first elastic member, for example, made of rubber, is arranged between the first electrode and a second housing member. The first electrode has a large-diameter portion, which is biased by the first elastic member toward a sealing surface formed on an inner wall of the hole, so as to fluid-tightly seal a space between the first electrode and the second housing member.
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Citations
6 Claims
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1. A fuel-aspect sensor comprising:
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a first housing member having a fuel chamber through which fuel flows and an insertion hole for communicating the fuel chamber with outside of the first housing member; a first electrode inserted into the insertion hole from an open end of the insertion hole, the first electrode having an inside space being in communication with the fuel chamber; a second electrode having a closed bottom portion, a lower part of the second electrode being accommodated in the inside space of the first electrode, so that an outer surface of the second electrode is exposed to the fuel introduced into the inside space of the first electrode; an insulating member for electrically insulating the first and second electrodes from each other and for firmly fixing the first and second electrodes to each other; a temperature sensor accommodated in the second electrode and fixed to an inside surface of the closed bottom portion thereof; a second housing member firmly attached to the first housing member for closing the open end of the insertion hole of the first housing member; an electronic control unit accommodated in the second housing member and electrically connected to the first electrode, the second electrode, and the temperature sensor, for detecting electrostatic capacity between the first and second electrodes; and an elastic member disposed between the second housing member and the first electrode for biasing the first electrode toward a sealing surface of the first housing member, which is formed at an inner wall of the insertion hole so as to oppose to the open end of the hole. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification