US4349746A
Expired / Lapsed
US
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Frequency generator
Assignee: Daimler Benz AG
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Filing: 1980-10-01
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Granted: 1982-09-14
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Expires: 2000-10-01
Abstract
Abstract A frequency generator module has a first generator circuit and a second generator circuit, the frequencies of these circuits being variable by a physical parameter, especially a distance or angular value, with two coils arranged coaxially at a mutual spacing on linear or curved, tubular coil holders, the inductance of these coils being variable by a core displaceable in the coil holder. The combined generator module is connected by a control circuit to a changeover switch which alternately switches the output of one of the two coils to the input of the frequency generator module. A short-circuit ring is arranged in an axially normal plane between the two coils, for the duration of a specific number of pulses of the generator circuit formed from the coil and the generator module. A control and/or regulating device is provided which calculates from certain pulses of successive pulse sequences of the two generator circuits the frequencies (f1; f2) and their difference (f1-f2) and/or a correcting value which is the difference between the actual value and the desired value of the sum total (f1+f2) of the frequencies of the two generator circuits. The corrected frequency difference and/or the value of the physical variable derived therefrom is indicated, or a signal proportional thereto is transmitted.
Inventors
- 👤 Horst Grossner
- 👤 Gunter Weiger
- 👤 Gunter Schwegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:11
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/22; G01D5/2208; G01D5/2216
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
150 words
A frequency generator comprising a first generator circuit and a second generator circuit, the frequencies of these circuits being variable by a parameter, with two coils arranged coaxially on one of linear and curved tubular coil holders, the inductances of these coils being variable by a core displaceable in the coil holder, a combined generator module connected by a control circuit and a changeover switch alternatingly with one of the two coils between which coils a short-circuit ring is arranged in an axially normal plane, for the duration of a specific number of pulses of the generator circuit formed from the coil and the generator module; and control regulating means for calculating from certain pulses of successive pulse sequences of the two generator circuits the frequencies (f1; f2) and their difference (f1-f2) and a corrected value thereof to indicate the corrected frequency difference and for transmitting a signal proportional thereto.
Claim 2
Dependent Claim
150 words
A frequency generator comprising a first generator circuit and a second generator circuit, the frequencies of these circuits being variable by a parameter, with two coils arranged coaxially on one of linear and curved tubular coil holders, the inductances of these coils being variable by a core displaceable in the coil holder, a combined generator module connected by a control circuit and a changeover switch alternatingly with one of the two coils between which coils a short-circuit ring is arranged in an axially normal plane, for the duration of a specific number of pulses of the generator circuit formed from the coil and the generator module; and control regulating means for calculating from certain pulses of successive pulse sequences of the two generator circuits the frequencies (f1; f2) and their difference (f1-f2) and a corrected value thereof to indicate the corrected frequency difference and for transmitting a signal proportional thereto.
Claim 3
Dependent Claim
38 words
A frequency generator according to claim 1, characterized in that the corrected value is the difference between the actual value and a desired value based upon the sum total (f1+f2) of the frequencies of the two generator circuits.
Claim 4
Dependent Claim
91 words
A frequency generator system comprising plural pulse generators having outputs of pulse frequencies f1 and f2, respectively, first means for alternately actuating said generators to produce the same predetermined number of pulses, second means to vary the pulse frequencies f1 and f2 in accordance with a parameter, third means for determining from the output of said pulse generators the value f1-f2, fourth means for determining from the output of said pulse generators the value f1+f2, and fifth means for applying a correction to the value f1-f2 dependent upon the value f1+f2.
Claim 5
Dependent Claim
91 words
A frequency generator system comprising plural pulse generators having outputs of pulse frequencies f1 and f2, respectively, first means for alternately actuating said generators to produce the same predetermined number of pulses, second means to vary the pulse frequencies f1 and f2 in accordance with a parameter, third means for determining from the output of said pulse generators the value f1-f2, fourth means for determining from the output of said pulse generators the value f1+f2, and fifth means for applying a correction to the value f1-f2 dependent upon the value f1+f2.
Claim 6
Dependent Claim
40 words
A frequency generation system as set forth in claim 3, wherein said first means comprises means effective to count said predetermined number of pulses output from said pulse generators only after transient effects produced by said first means have decayed.
Claim 7
Dependent Claim
35 words
A frequency generation system as set forth in claim 3, wherein said second means comprises two coils arranged coaxially, a core axially displaceable to vary the inductances of said coils in accordance with said parameter.
Claim 8
Dependent Claim
62 words
A frequency generation system as set forth in claim 3, wherein said fifth means comprises sixth means for storing a table of values of f1+f2 correlated to values of a correction factor for application to said value f1-f2, and seventh means responsive to said fifth means to select from said sixth means a correction factor value to apply to said value f1-f2.
Claim 9
Dependent Claim
75 words
A frequency generation system comprising the steps of generating plural pulse trains of frequencies f1 and f2, generating alternative output pulse trains of equal predetermined numbers of pulses of said frequencies f1 and f2, varying the said pulse frequencies f1 and f2 in accordance with a parameter, determining the value of f1-f2, determining the value of f1+f2, and applying a correction to the determined value of f1-f2 in accordance with the determined value of f1+f2.
Claim 10
Dependent Claim
75 words
A frequency generation system comprising the steps of generating plural pulse trains of frequencies f1 and f2, generating alternative output pulse trains of equal predetermined numbers of pulses of said frequencies f1 and f2, varying the said pulse frequencies f1 and f2 in accordance with a parameter, determining the value of f1-f2, determining the value of f1+f2, and applying a correction to the determined value of f1-f2 in accordance with the determined value of f1+f2.
Claim 11
Dependent Claim
39 words
A frequency generation system as set forth in claim 7, comprising the additional step of blocking the said generation of alternate output pulse trains during the time periods within which transient effects produced by said alternate generation step exist.
Claim 12
Dependent Claim
27 words
A frequency generation system as set forth in claim 7, wherein said varying step comprises varying inductance in accordance with said parameters to vary said pulse frequencies.
Claim 13
Dependent Claim
51 words
A frequency generation system as set forth in claim 9, wherein said applying step comprises storing a table of values for f1+f2 correlated to values for correction factors for f1-f2, selecting a correction factor from said table corresponding to said determined value of f1+f2 to apply to said determined value f1-f2.
Claim 14
Dependent Claim
20 words
A frequency generation system as set forth in claim 5, further comprising a short-circuit ring means disposed between said coils.
Claim 15
Dependent Claim
17 words
A frequency generation system as set forth in claim 9, comprising the step of short-circuiting said inductance.
References Cited (Backward Citations)
US4088874A
Cited
US4135243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |