US3863153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed measurement and indication apparatus
Assignee: US Philips Corp
•
Filing: 1972-11-10
•
Granted: 1975-01-28
•
Expires: 1992-11-10
Abstract
Abstract A speed indicating device where a pulse train having a frequency corresponding to the speed is periodically counted. The contents of the counter are sampled and displayed periodically. The sampling frequency of the counter is increased in response to the absolute value of the rate of change of the speed indicating pulse train frequency.
Inventors
- 👤 Kamran Eshraghian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:02
CPC Classifications
H; H03; H03K; H03K21/00; H03K21/08; G; G01; G01P; G01P1/00; G01P1/07; G01P1/08; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/481; G01P3/489
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
245 words
In a speed measurement and indication apparatus of the type wherein a counter is adapted to count the number of pulses of a signal pulse train occurring during each of a succession of measurement intervals of fixed duration, the pulse recurrence frequency of the signal pulse train being related to the speed to be measured and indicated; an indicator displays in digital form the information present at the output of a gated storage circuit the input of which is supplied with the counter information; a sampling pulse source supplies sampling pulses to the storage circuit, and wherein the storage circuit is arranged to be so gated by the sampling pulses applied thereto that during the presence of a sampling pulse the input information of the storage circuit is transferred to the output thereof while the input information present at the time of cessation of the sampling pulse is retained at the output of the storage circuit until the occurrence of the next succeeding sampling pulse, each applied sampling pulse being substantially coincident with termination of a measurement interval, wherein the improvement comprises frequency responsive means for providing a control signal corresponding to the magnitude of a change in the frequency of said signal pulse train, and control means for increasing the sampling rate of said sampling pulse source in response to said control signal, whereby the recurrence rate of the applied sampling pulses is determined by the rate of change of speed to be measured.
Claim 2
Dependent Claim
245 words
In a speed measurement and indication apparatus of the type wherein a counter is adapted to count the number of pulses of a signal pulse train occurring during each of a succession of measurement intervals of fixed duration, the pulse recurrence frequency of the signal pulse train being related to the speed to be measured and indicated; an indicator displays in digital form the information present at the output of a gated storage circuit the input of which is supplied with the counter information; a sampling pulse source supplies sampling pulses to the storage circuit, and wherein the storage circuit is arranged to be so gated by the sampling pulses applied thereto that during the presence of a sampling pulse the input information of the storage circuit is transferred to the output thereof while the input information present at the time of cessation of the sampling pulse is retained at the output of the storage circuit until the occurrence of the next succeeding sampling pulse, each applied sampling pulse being substantially coincident with termination of a measurement interval, wherein the improvement comprises frequency responsive means for providing a control signal corresponding to the magnitude of a change in the frequency of said signal pulse train, and control means for increasing the sampling rate of said sampling pulse source in response to said control signal, whereby the recurrence rate of the applied sampling pulses is determined by the rate of change of speed to be measured.
Claim 3
Dependent Claim
45 words
A speed measurement and indication apparatus as claimed in claim 1 wherein the control means comprises means for increasing and decreasing the recurrence rate of the applied sampling pulses substantially continuously with increase or decrease of the rate of change of the speed being measured.
Claim 4
Dependent Claim
46 words
speed measurement and indication apparatus as claimed in claim 1 wherein the control means comprises means for increasing and decreasing the recurrence rate of the applied sampling pulses in a stepwise manner with increase or decrease of the rate of change of the speed being measured.
Claim 5
Dependent Claim
90 words
A speed measurement and indication apparatus as claimed in claim 1 wherein the sampling pulse source comprises a reference pulse generator means for producing a first reference pulse train and a second reference pulse train, the pulses of the second reference pulse train having a fixed time relationship to the pulses of The first reference pulse train, means for resetting said counter to zero at the occurrence of each pulse of the first reference pulse train, and said sampling pulses being derived from pulses of the second reference pulse train.
Claim 6
Dependent Claim
107 words
A speed measurement and indication apparatus as claimed in claim 4 wherein said control means comprises a variable frequency pulse generator for providing a variable frequency pulse train of pulses having a duration substantially equal to the period of the said reference pulse generator, and a coincidence circuit fed by the variable frequency pulse train and by the second reference pulse train for producing sampling pulses which are supplied to the gated storage circuit, a sampling pulse being supplied at each occurrence of a pulse of a pulse of the second reference pulse train substantially within the duration of a pulse of the variable frequency pulse train.
Claim 7
Dependent Claim
65 words
A speed measurement and indication apparatus as claimed in claim 4 wherein said control means includes pulse frequency dividing means via which sampling pulses may be derived, and means for selectively supplying said first pulse train directly to said gated storage circuit on to said gated storage circuit through said pulse frequency dividing means in response to said control signal from said frequency responsive means.
Claim 8
Dependent Claim
87 words
A speed measurement and indication apparatus as claimed in claim 1, further comprising a synchronizing means arranged to receive the signal pulse train for initiating, in response to a pulse of the signal pulse train occuring subsequent to a count interval, a further count interval and for producing a sampling pulse substantially coincident with the termination of the further count interval, whereby each sampling pulse terminates a measurement interval the commencement of which is the commencement of the count interval with which the sample pulse is associated.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |