Patent TW387186B successfully refreshed from Google Patents.
US3733557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for detecting rate of change in voltage
Assignee: Denso Corp
•
Filing: 1971-09-10
•
Granted: 1973-05-15
•
Expires: 1991-09-10
Abstract
Abstract When the difference between a voltage representative of a reference velocity which gradually falls off at a rate determined by an integrating constant and a voltage proportional to the rotating velocity of a rotating body, becomes greater than a predetermined value, the reference velocity voltage is made to approach the rotational velocity proportional voltage by rendering the integrating constant small. Thereby, the time during which a spurious signal indicating a deceleration is developed though the rotating body is actually accelerating, can be shortened to such a considerable extent that no undesireable effects are incurred in practical operation.
Inventors
- 👤 H Fujinami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:18
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/17; B60T8/172; G; G01; G01P; G01P3/00; G01P3/42; G01P3/56; G01P3/58; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186; G06G7/48; G06G7/70
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
138 words
A device for detecting the rate of change in voltage, comprising: an integrator to generate a voltage representative of a reference velocity which is gradually decreased at a rate determined by the integration constant of said integrator; a first comparator to compare said reference velocity voltage put out of said integrator with a voltage proportional to the rotating velocity of a rotating body, to produce an output signal when said rotating velocity proportional voltage exceeds said reference velocity voltage, and to provide a negative feedback for said integrator in response to said output signal; and a second comparator which reduces said integration constant when the difference between said reference velocity voltage and said rotating velocity proportional voltage is greater than a predetermined value and which thereby causes said reference velocity voltage to approach said rotating velocity proportional voltage.
Claim 2
Independent Claim
138 words
A device for detecting the rate of change in voltage, comprising: an integrator to generate a voltage representative of a reference velocity which is gradually decreased at a rate determined by the integration constant of said integrator; a first comparator to compare said reference velocity voltage put out of said integrator with a voltage proportional to the rotating velocity of a rotating body, to produce an output signal when said rotating velocity proportional voltage exceeds said reference velocity voltage, and to provide a negative feedback for said integrator in response to said output signal; and a second comparator which reduces said integration constant when the difference between said reference velocity voltage and said rotating velocity proportional voltage is greater than a predetermined value and which thereby causes said reference velocity voltage to approach said rotating velocity proportional voltage.
Claim 3
Dependent Claim
19 words
A device as claimed in claim 1, wherein said integrator is constituted of an operational amplifier and a capacitor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |