US3690165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automobile tester
Assignee: F A V Srl
•
Filing: 1970-05-14
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Granted: 1972-09-12
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Expires: 1990-05-14
Abstract
Abstract A test-bed for automobile vehicles has pairs of coupled rollers to receive each of the wheels of the vehicle, with a tachymetric dynamo coupled to each pair. An electrical machine, capable of functioning selectively as a motor or as a generator is coupled to each pair of rollers. The circuitry of the electrical machines is such that the torque exerted (when they act as a motor) or the resistance coupled exerted (when they act as a generator) can be made to compensate exactly, at various speeds, for the differences which exist between the equivalent moment of inertia of the vehicle and the effective moment of inertia possessed by the rotating parts of the test-bed.
Inventors
- 👤 Giuseppe Sturmo
- 👤 Mario Maran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:42
CPC Classifications
G; G01; G01M; G01M17/00; G01M17/007; G01M17/0072
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
263 words
A test-bed for automobile vehicles comprising: two pairs of rollers, each said pair of rollers being intended to receive thereon one of two wheels of the vehicle under test; means coupling rotationally one roller of each pair with the other roller of said pair; a respective tachymetric dynamo coupled rotationally to each pair of rollers; a rotatable electrical machine coupled rotationally with each said pair of rollers and said machine functioning selectively as an electrical motor and as an electrical generator, said machine including means responsive to the torque exerted when functioning as an electrical motor and to the resistance couple exerted when functioning as an electrical generator, which means compensates, under conditions of varying speed, the difference between the equivalent moment of inertia of the vehicle under test and the effective moment of inertia possessed by the rotating parts of the test-bed; and a programming device connected to the machine and to the tachymetric dynamo and stabilizing the electrical machine when said machine functions as an electrical motor, in response to a determined value of load resistance, said programming device being interlocked with the simulated speed of the vehicle as measured by said tachymetric dynamo and varied according to said speed, said programming device operating according to the relationship: CME (Jx-Jo) (d omega /dt) where: CME the torque couple of the rotatable electrical machine. Jx the equivalent moment of inertia of the automobile. Jo the moment of inertia of the rotating complex of the test bed. d omega /dt the angular deceleration of the rollers, corresponding to that of the simulated speed.
Claim 2
Dependent Claim
263 words
A test-bed for automobile vehicles comprising: two pairs of rollers, each said pair of rollers being intended to receive thereon one of two wheels of the vehicle under test; means coupling rotationally one roller of each pair with the other roller of said pair; a respective tachymetric dynamo coupled rotationally to each pair of rollers; a rotatable electrical machine coupled rotationally with each said pair of rollers and said machine functioning selectively as an electrical motor and as an electrical generator, said machine including means responsive to the torque exerted when functioning as an electrical motor and to the resistance couple exerted when functioning as an electrical generator, which means compensates, under conditions of varying speed, the difference between the equivalent moment of inertia of the vehicle under test and the effective moment of inertia possessed by the rotating parts of the test-bed; and a programming device connected to the machine and to the tachymetric dynamo and stabilizing the electrical machine when said machine functions as an electrical motor, in response to a determined value of load resistance, said programming device being interlocked with the simulated speed of the vehicle as measured by said tachymetric dynamo and varied according to said speed, said programming device operating according to the relationship: CME (Jx-Jo) (d omega /dt) where: CME the torque couple of the rotatable electrical machine. Jx the equivalent moment of inertia of the automobile. Jo the moment of inertia of the rotating complex of the test bed. d omega /dt the angular deceleration of the rollers, corresponding to that of the simulated speed.
Claim 3
Dependent Claim
75 words
A test-bed for automobile vehicles, as claimed in claim 1, comprising respective revolution counters coupled to the breaking means and to the pairs of rollers receiving the wheels of the vehicle, said counters commencing to operate at the moment when braking commences so as to measure the braking distance at a test speed of the stationary vehicle, separately for each wheel of the vehicle and corresponding to a measured force applied to the brake pedal.
Claim 4
Dependent Claim
35 words
A test-bed for automobile vehicles, as claimed in claim 1, comprising means for measuring power delivered by said electrical machines functioning as electrical generators, thereby to measure the motive power of the vehicle under test.
Claim 5
Dependent Claim
72 words
A test-bed for automobile vehicles, as claimed in claim 1, comprising flywheel means, and means for coupling said rollers thereto, said flywheel means serving to reduce the differences between the moment of inertia of the rollers and the equivalent moment of inertia of the vehicle under test, and thereby reduce the nominal power of the electrical machines and thus also the power needed to compensate a given range of vehicles under test.
Claim 6
Dependent Claim
63 words
A test-bed for automobile vehicles, as claimed in claim 1, comprising apparatus for registering deceleration coupled to said tachymetric dynamos and eliminating both the braking couple of the braking mechanism of the vehicle as a function of the speed in relation to a determined value of the force applied to the brake pedal, and at low speed the geometry of the braking system.
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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) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |