Patent US4083423A successfully refreshed from Google Patents.
US4083423A
Expired / Lapsed
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Vehicle road speed signal source
Assignee: Rostra Precision Controls Inc
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Filing: 1975-07-02
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Granted: 1978-04-11
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Expires: 1995-07-02
Abstract
Abstract A vehicle road speed signal source including a speed sensor and a frequency to voltage converter for generating a pulsed output signal having an average magnitude proportional to the road speed of an associated vehicle. The speed sensor has a high energy product magnet attached to the drive shaft of the vehicle which induces current pulses in approximately spaced pick-up coil. The pick-up coil is connected to a preamplifier having a low input impedance to reduce the effect of spurious signals such as ignition noise. The preamplifier output signal may be shaped into a square wave pulse train or may be applied directly to the frequency to voltage converter which generates a pulsed output signal having a duty cycle and therefore an average magnitude proportional to the vehicle road speed.
Inventors
- 👤 James A. Williams
- 👤 Larry O. Gray
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:33
CPC Classifications
B; B60; B60K; B60K31/00; B60K31/02; B60K31/04; G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/4802; G01P3/481; G01P3/487
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
An apparatus for generating a pulsed output signal representing the road speed of a vehicle, comprising high energy product magnetic means attached to a member of the vehicle rotating at a rate proportional to the road speed of the vehicle and movable relative to another member of the vehicle; electromagnetically responsive means for sensing each rotation of said magnetic means and generating a current pulse in response thereto, said sensing means being mounted on said another member of the vehicle and spaced from the path of travel of said magnetic means to allow for relative displacement of said rotating vehicle member with respect to the mounting position of said sensing means; and low input impedance means responsive to said current pulse for generating said pulsed output signal whereby spurious signals are suppressed from said pulsed output signal.
Claim 2
Independent Claim
137 words
An apparatus for generating a pulsed output signal representing the road speed of a vehicle, comprising high energy product magnetic means attached to a member of the vehicle rotating at a rate proportional to the road speed of the vehicle and movable relative to another member of the vehicle; electromagnetically responsive means for sensing each rotation of said magnetic means and generating a current pulse in response thereto, said sensing means being mounted on said another member of the vehicle and spaced from the path of travel of said magnetic means to allow for relative displacement of said rotating vehicle member with respect to the mounting position of said sensing means; and low input impedance means responsive to said current pulse for generating said pulsed output signal whereby spurious signals are suppressed from said pulsed output signal.
Claim 3
Dependent Claim
14 words
An apparatus according to claim 1 wherein said vehicle member is a drive shaft.
Claim 4
Dependent Claim
18 words
An apparatus according to claim 1 wherein said magnetic means is a relatively high energy product permanent magnet.
Claim 5
Dependent Claim
70 words
An apparatus according to claim 1 wherein said sensing means is a coil normally spaced approximately 2 inches from the path of travel of said magnetic means to allow for relative displacement of said vehicle member with respect to said coil and said magnetic means generates a magnetic field for inducing said current pulse in said coil when said magnetic means traverses the portion of said path closest said coil.
Claim 6
Dependent Claim
48 words
An apparatus according to claim 4 wherein said low input impedance means includes a low input impedance preamplifier means for amplifying at least a portion of said current pulse and a frequency to voltage converter responsive to said amplified current pulse portion for generating said pulsed output signal.
Claim 7
Dependent Claim
27 words
An apparatus according to claim 5 wherein said frequency to voltage converter includes a monostable multivibrator for generating said pulsed output signal with a constant pulse width.
Claim 8
Dependent Claim
51 words
An apparatus according to claim 1 wherein said means for generating a pulsed output signal includes a low input impedance preamplifier means for amplifying at least a portion of said current pulse and a frequency to voltage converter responsive to said amplified current pulse portion for generating said pulsed output signal.
Claim 9
Dependent Claim
47 words
An apparatus according to claim 7 wherein said preamplifier means includes a transistor connected in a common base configuration having an emitter connected for receiving said current pulse and a collector, at which said amplified current pulse portion is generated, connected to said frequency to voltage converter.
Claim 10
Dependent Claim
27 words
An apparatus according to claim 7 wherein said frequency to voltage converter includes a monostable multivibrator for generating said pulsed output signal with a constant pulse width.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-10 | 1981-10-10 | 1982-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-10 | 1985-10-10 | 1986-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-10 | 1989-10-10 | 1990-04-11 | $7700.00 | Window Closed / Lapsed |