1. A system for detecting and transmitting test data from a housing (10) comprising a pressure chamber (11) that is filled with a high-pressure fluid and is homogeneously pressurized via printed conductors (21) connected to a sensing element (23) situated in the pressure chamber (11) and are guided out of the housing (10), a circuit board (12), both faces of which being subjected to the pressure prevailing in the pressure chamber (11) and at least one portion (30) of which extending out of the housing (10), being situated inside the pressure chamber (11) as a support for the strip conductors (21) and the housing (10) that encloses the pressure chamber (11) being separated in the plane of the circuit board and the faces of the housing halves (13, 14) clamping the circuit board (12) between them in such a way that radial forces exerted within the circuit board are absorbed when pressure is applied.
2. The system as recited in claim 1, wherein the housing halves (13, 14) hold the circuit board (12) by a frictional connection.
3. The system as recited in claim 1, wherein the housing halves (13, 14) hold the circuit board (12) by a positive connection.
4. The system as recited in claim 1, wherein the circuit board (12) is made from a hard plastic.
5. The system as recited in claim 1, wherein seals (18) are situated between faces (15) of the housing halves (13, 14) which clamp the circuit board (12) and the surfaces of the circuit board (12).
6. The use of a system designed as recited in claim 1 for detecting the longitudinal movements of a valve piston movable in hydraulic valves.
7. The system as recited in claim 1, wherein one housing half (14) encompasses opposite facing other housing half (13) externally via an axially projecting flange (16), an external edge area of the circuit board (12) being in contact with an inside of the flange (16).
8. The system as recited in claim 7, wherein the flange (16) has a cutout (17) extending across a limited circumferential portion, which is penetrated by a projection (30) extending outwardly from the circuit board (12).
9. The system as recited in claim 1, wherein at least one sensor that detects a change of length of the circuit board (12) is situated on the circuit board (12).
10. The system as recited in claim 9, wherein the sensor is a strain gauge.
11. The system as recited in claim 9, wherein a sensor recording a change of the material thickness of the circuit board (12) is situated in the circuit board (12).
12. The system as recited in claim 1, wherein the circuit board (12) has a recess (19) used to equalize pressure between sub-chambers (11a, 11b) of the pressure chamber (11) located on both sides of the circuit board.
13. The system as recited in claim 12, wherein the circuit board is designed to accommodate a position measuring system and a position pickup coil (23) being situated in the recess (19) and connected to the printed conductors (21) located on the circuit board (12), the position pickup coil (23) lying in the fluid located in the pressure chamber (11) surrounding a position pickup core (25) which is axially movable through the recess (19) of the circuit board (12) and the position pickup coil (25).
14. The system as recited in claim 13, wherein a wire winding (32) of the position pickup coil (23) which is located on a coil frame (31) is spray coated with a suitable material.
15. The system as recited in claim 14, wherein the spray coating (35) of the wire winding (32) includes connections of the wire winding (32) to printed conductors (21) extending in the circuit board (12).
16. The system as recited in claim 14, wherein the material of the spray coating (35) matches the material of the circuit board (12).
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An exhaust gas purification apparatus for an internal combustion engine, including:
a selective reduction type NOx catalyst that is provided in an exhaust passage of the internal combustion engine, and selectively reduces NOx when a reducing agent is supplied thereto;
a supply unit that supplies the reducing agent to the selective reduction type NOx catalyst from an upstream side of the selective reduction type NOx catalyst; and
a temperature acquisition unit that obtains a temperature of the selective reduction type NOx catalyst,
the exhaust gas purification apparatus comprising:
an upper limit value calculation unit that calculates, on the basis of the temperature of the selective reduction type NOx catalyst obtained by the temperature acquisition unit, an upper limit value of a reducing agent amount that is adsorbed to the selective reduction type NOx catalyst when the reducing agent is supplied continuously by the supply unit;
a variation amount calculation unit that calculates a variation amount over a predetermined time in the reducing agent amount adsorbed to the selective reduction type NOx catalyst from the upper limit value calculated by the upper limit value calculation unit and the reducing agent amount adsorbed to the selective reduction type NOx catalyst; and
an estimation unit that estimates a reducing agent amount adsorbed to the selective reduction type NOx catalyst following the elapse of the predetermined time by adding the variation amount calculated by the variation amount calculation unit to the reducing agent amount adsorbed to the selective reduction type NOx catalyst.
2. The exhaust gas purification apparatus for an internal combustion engine according to claim 1, wherein the variation amount calculation unit calculates the variation amount from a difference between the upper limit value calculated by the upper limit value calculation unit and the reducing agent amount adsorbed to the selective reduction type NOx catalyst, and a predetermined transition of the reducing agent amount that is adsorbed to the selective reduction type NOx catalyst when the reducing agent is supplied continuously from the supply unit.
3. The exhaust gas purification apparatus for an internal combustion engine according to claim 1, wherein the upper limit value calculation unit calculates a reducing agent surplus generated in the selective reduction type NOx catalyst by subtracting a reducing agent amount consumed by the selective reduction type NOx catalyst while reducing the NOx from a reducing agent amount supplied by the supply unit, and
the upper limit value calculation unit calculates the upper limit value of the reducing agent amount that is adsorbed to the selective reduction type NOx catalyst when the reducing agent is supplied continuously by the supply unit, on the basis of the reducing agent surplus generated in the selective reduction type NOx catalyst and the temperature obtained by the temperature acquisition unit.
4. The exhaust gas purification apparatus for an internal combustion engine according to claim 1, further comprising a determination unit that determines that the reducing agent is about to flow out of the selective reduction type NOx catalyst when a difference between the upper limit value calculated by the upper limit value calculation unit and the reducing agent amount adsorbed to the selective reduction type NOx catalyst, estimated by the estimation unit, is smaller than a threshold.