Patent US4059751A successfully refreshed from Google Patents.
US4059751A
Expired / Lapsed
US
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Logic controlled integrator
Assignee: Saab Bofors AB
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Filing: 1975-09-29
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Granted: 1977-11-22
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Expires: 1995-09-29
Abstract
Abstract The input to an integrator is controlled by a logic circuit to reduce tracking errors caused by changes in acceleration. In one embodiment, the logic circuit obtains the derivative of the input signal and multiplies it with the input signal. The input signal is fed to the integrator through a switch which is closed when the product of the input signal and its derivative is positive, and which is open when the product is negative.
Inventors
- 👤 Sven Willner Eriksson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:24
CPC Classifications
G; G05; G05B; G05B11/00; G05B11/01; G05B11/36; G05B11/40
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
A control system including an integrator controlled by a logic circuit comprising: an integrator having an input terminal, switching means for at times connecting an input signal e to said integrator input terminal, logic means driven by said input signal e for controlling said switching means to connect said input signal e to said integrator input terminal, said logic means including a derivative circuit to produce the derivative e of said input signal and in which said logic means forms the product of e · e.
Claim 2
Dependent Claim
86 words
A control system including an integrator controlled by a logic circuit comprising: an integrator having an input terminal, switching means for at times connecting an input signal e to said integrator input terminal, logic means driven by said input signal e for controlling said switching means to connect said input signal e to said integrator input terminal, said logic means including a derivative circuit to produce the derivative e of said input signal and in which said logic means forms the product of e · e.
Claim 3
Dependent Claim
22 words
The circuit of claim 1 in which said logic means controls said switching means in dependence upon the sign of said product.
Claim 4
Dependent Claim
29 words
The circuit of claim 1 in which said logic means controls said switching means to be closed when said product is positive, and opened when said product is negative.
References Cited (Backward Citations)
US2675469A
Cited
US3444361A
Cited
US3404262A
Cited
US3311740A
Cited
DE1548794A1
Cited
US3685159A
Cited
US3609314A
Cited
US3842416A
Cited
US3783392A
Cited
US3883863A
Cited
US3885760A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-21 | 1981-05-23 | 1981-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-21 | 1985-05-23 | 1985-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-21 | 1989-05-23 | 1989-11-22 | $7700.00 | Window Closed / Lapsed |