Pressure sensor for detecting the pressure of a liquid
AssigneeSiemens Aktiengesellschaft
InventorManfred Weigl
Life of this patent
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Abstract
A pressure sensor includes a pressure sensor element that is provided with a pressure sensor membrane. The pressure sensor element is held in a receiving part in a defined position during operation within a permissible operating pressure range by a spring element. When the permissible working pressure range is exceeded, a relative movement, acting against the spring force, between the pressure sensor element and the receiving part takes place, thereby increasing the volume of the space immediately upstream of the pressure sensor membrane. The design allows for a limitation of the pressure and for an effective protection of the pressure sensor membrane when the liquid is frozen.
Claims4
A pressure sensor (18) for sensing the pressure of a fluid, in particular of a solution of reducing agent for exhaust gas post-treatment in an internal combustion engine (1),
- having a pressure sensor element (180) which has a pressure sensor diaphragm (181),
- having a holding part (185, 186) for holding the pressure sensor element (180), and
- at least one spring element (192),
- which can be used to hold the pressure sensor element (180) within an acceptable working pressure range of the pressure sensor element (180) in a defined solution in the holding part (185, 186), and which
- limits the pressure on the pressure sensor diaphragm (181) when the acceptable working pressure range of the pressure sensor element (180) is exceeded and in which
- the pressure sensor diaphragm (181) can be wetted directly by the fluid.
Dependencies are inferred from the claim text.