Internal-combustion engines – Cooling – Interrelated coolant flow and throttle control
Patent
1996-08-21
1998-07-07
Kamen, Noah P.
Internal-combustion engines
Cooling
Interrelated coolant flow and throttle control
236 345, 236 68R, F01P 714
Patent
active
057752702
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to a thermostatic valve for the coolant circulation system of an internal-combustion engine.
A thermostatic valve with a separate heat supply device designed as an electric heating device is known, for example, from German Patent Document DE-A 42 33 913. In the case of this thermostatic valve, the capsule of the expansion material element which stores the expansion material is covered by means of a cap made of plastic in the cold-side end section containing the heating device. The cap, which has an insulating effect with respect to a cold coolant upstream of the main valve, extends along the capsule in such a manner that it reaches through the opening of the valve disk and, by means of a sealing agent, seals off the opening along a first opening lift section of the valve disk. During a further opening lift, cold coolant flows by way of the ring gap formed between the opening and the outer circumference of the capsule to the hot-side end section of the capsule or of the expansion material element for the purpose of cooling the expansion material stored in the capsule.
In the case of a thermostatic valve with an electrically driven heating device, the latter can be connected and disconnected as a function of characteristic diagram quantities, particularly of the internal-combustion engine. For the case of a relatively high coolant temperature, set preferably to above 100.degree. C., in the cooling circulation system of the internal-combustion engine, a fast-reacting thermostatic valve is required for the fastest possible adaptation of the coolant temperature to a changed load requirement.
The initially described thermostatic valve operates relatively slowly for a corresponding coolant temperature adaptation in the case of fast load cycles of different dimensions because, on the one hand, the portion of the expansion material capsule which is directly acted upon in a hot manner is relatively small in comparison to the proportion covered by the insulating cap and because, on the other hand, the PTC-element provided as the electric heating device, as the PTC-resistor, has a sluggish response characteristic corresponding to its mass.
It is an object of the invention to improve, in the case of a thermostatic valve of the initially mentioned type, the additional heat supply device in such a manner that a faster response characteristic of the thermostatic valve is achieved.
This and other objects have been achieved according to the present invention by providing a heat supply device as a toroidal chamber which has a hot-side coolant connection and is assigned to the expansion material capsule in the cold-side end section on the other side of the valve disk.
It is the basic idea of the invention to act upon a portion of the cold-side end section of the expansion material element or of the expansion material capsule by means of the toroidal chamber while the main valve blocks the flow-through of the cold coolant completely or by way of a predetermined opening lift partially with a hot coolant. In this manner, a relatively large expansion material proportion is advantageously heated more rapidly by way of short heat conducting paths through the jacket of the expansion material capsule by means of the hot coolant and is also maintained at a higher temperature level. By means of this higher temperature level, the difference with respect to the control temperature of the expansion material element is reduced, resulting in a faster response of the thermostatic valve.
A preferred embodiment of the invention is characterized in that a pipe section, which is arranged in the opening of the valve disk and protrudes on the cold-side, together with the outer circumference of the expansion material capsule, forms the coolant-containing toroidal chamber which, on the cold side, has an opening which is controlled as a function of a predetermined lift of the valve disk or of the pipe section. The advantage of this toroidal chamber designed according to the invention is
REFERENCES:
patent: 5385296 (1995-01-01), Kurz
Ullmanns Enclyklpaedie der technischen Chemie, 4., neubearbeitete und erweiterte Auflage, Band 7, Acaricide--Antihistaminica, Verlag Chemie, Weinheim/Bergstr., pp. 298-301.
Huemer Gerhart
Kurz Manfred
Lemberger Heinz
Leu Peter
Saur Roland
Behr Thermot-tronik GmbH & Co.
Kamen Noah P.
LandOfFree
Thermostatic valve for the coolant circulation system of an inte does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Thermostatic valve for the coolant circulation system of an inte, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermostatic valve for the coolant circulation system of an inte will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1195229