Temperature probe

Details Temperature probe Temperature probe

1994-06-30

1995-10-31

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

Combined with diverse art device

374183, 374208, 338 22R, 338229, G01K 100, G01K 700, H01L 102

Patent

active

054623596

DESCRIPTION:

BRIEF SUMMARY
PRIOR ART

The invention is directed to a temperature probe for measuring the temperature of a medium flowing in a flow line of an internal combustion engine. A temperature probe is already known (DE 30 44 40 419 C2), in which a temperature-dependent, electrical resistance element with two connecting wires is surrounded, without touching it, by a protective casing exhibiting through-openings. In the case of such a temperature probe, a mechanical oscillatory excitation dependent upon the place of installation may lead to wire fracture in the connecting wires; this leads to a failure of the temperature probe. Over and above this, the protective casing reduces the free access by the flow medium to be measured to the resistance element, which increases the response time to temperature changes.
Since the temperature of the intake air can be for example an input variable for an electronically controlled fuel injection system and input variables which are affected by errors influence the formation of the fuel-air mixture in an undesired manner, for the operation of an internal combustion engine there is a requirement for temperature detection which is as far as possible free from interference and free from delay in temperature changes.


ADVANTAGES OF THE INVENTION

The temperature probe according to the invention, has the advantage that free access in the direction of flow by the flow medium to be measured to the electrical resistance element is guaranteed, whereby temperature detection which is free from interference and free from delay takes place; in this case, at the same time, stabilization of the connecting wires and of the resistance element is assured.
Advantageous developments and improvements to the temperature probe are possible as a result of the measures cited hereinafter.
Particularly advantageous is the arrangement of the connecting lines in the carrier body, whereby extensive protection against instances of damage is achieved.
The formation of a plug element on the carrier body permits simple and disturbance-free connection of connecting lines for signal transmission.
The arrangement of the carrier body in a through-opening in the flow line guarantees advantageous mounting of the temperature probe.


BRIEF DESCRIPTION OF THE DRAWINGS

Illustrative embodiments of the invention are shown in simplified form in the drawings and are explained in greater detail in the description which follows.
FIG. 1 shows a longitudinal section through a first illustrative embodiment of a temperature probe designed according to the invention,
FIG. 2 shows a side elevation of a temperature probe according to the illustrative embodiment according to FIG. 1, and
FIG. 3 shows a partial section through a flow window of a second illustrative embodiment of a temperature probe.


DESCRIPTION OF THE ILLUSTRATIVE EMBODIMENT

In FIG. 1, a temperature probe is designated by 1, which temperature probe serves for example for the measurement of the temperature of the intake air in an intake pipe of a mixture-compressing, external-ignition internal combustion engine. The temperature probe 1 has a carrier body 2, which preferably comprises plastic material and in which plug lugs 3, 4 are secured, for example by extension coating. The plug lugs 3, 4 are electrically conductively connected, at connecting points 25, 26, to connecting wires 5, 6 of a temperature-dependent electrical resistance element 7, which advantageously exhibits a negative temperature coefficient (NTC thermistor).
The connecting wire 6 situated on one of the sides of the resistance element 7 is approximately twice the length of the connecting wire 5 engaging on the other side of the resistance element 7 and exhibits a curved, approximately semicircular bend point 18, which is situated close to the resistance element 7, whereby the connecting wires 5, 6 adopt an approximately U-shaped course. At an end face 8, facing the resistance element 7, of the carrier body 2 there is formed a protective bracket 10, which laterally surrounds the resistance element 7 and the conn

REFERENCES:
patent: 2496806 (1950-02-01), Moffatt
patent: 2799758 (1957-07-01), Hutchins
patent: 2820839 (1958-01-01), Schunke
patent: 3005171 (1961-10-01), Beckman
patent: 3232794 (1966-02-01), Korton
patent: 3526134 (1970-09-01), Paine
patent: 4382246 (1983-05-01), Hansson et al.
patent: 4479026 (1984-10-01), Brixy et al.

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