US3718036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle testing apparatus
Assignee: Snap On Equipment Ltd
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Filing: 1971-03-29
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Granted: 1973-02-27
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Expires: 1991-03-29
Abstract
Abstract The disclosure describes a chassis dynamometer provided with control means which may be activated so as to maintain the acceleration of the dynamometer rollers at a predetermined constant positive or negative value. Means are provided to multiply the braking torque absorbed by the dynamometer by the speed of rotation of the idle roller and to add to the product a signal proportional to the speed of rotation of the rollers so as to maintain a signal substantially proportional to the traction power output of the vehicle being tested while accelerating or decelerating at the predetermined constant value.
Inventors
- 👤 J Marten
- 👤 B Gee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:50
CPC Classifications
G; G01; G01M; G01M17/00; G01M17/007; G01M17/0072; G01L; G01L3/00; G01L3/24; G01L3/242
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
In a motor vehicle testing system including a chassis dynamometer having rollers that are moved by a source of power, improved apparatus for measuring the power produced by the source comprising: brake means for applying a predetermined amount of torque to at least one of the rollers; braking-power signal generating means for generating a brakingpower signal dependent on the braking-power absorbed by the dynamometer; acceleration-power signal generating means for generating an acceleration-power signal dependent on the power required to accelerate the dynamometer rollers; means for summing the braking-power signal and accelerationpower signal so as to derive a signal dependent on the power absorbed by the dynamometer; and control means connected to the brake means for controlling the braking torque developed by the brake means so as to maintain the dynamometer acceleration at a predetermined positive or negative value.
Claim 2
Dependent Claim
138 words
In a motor vehicle testing system including a chassis dynamometer having rollers that are moved by a source of power, improved apparatus for measuring the power produced by the source comprising: brake means for applying a predetermined amount of torque to at least one of the rollers; braking-power signal generating means for generating a brakingpower signal dependent on the braking-power absorbed by the dynamometer; acceleration-power signal generating means for generating an acceleration-power signal dependent on the power required to accelerate the dynamometer rollers; means for summing the braking-power signal and accelerationpower signal so as to derive a signal dependent on the power absorbed by the dynamometer; and control means connected to the brake means for controlling the braking torque developed by the brake means so as to maintain the dynamometer acceleration at a predetermined positive or negative value.
Claim 3
Dependent Claim
44 words
Apparatus, as claimed in claim 1, wherein the acceleration-power signal generating means comprise means for generating a speed signal dependent on the speed of rotation of the dynamometer rollers, and means for transmitting a portion of the speed signal to the means for summing.
Claim 4
Dependent Claim
47 words
Apparatus, as claimed in claim 2, wherein the control means comprise generator means for generating a ramp signal and speed control means connected between the generator means and the brake means for controlling the speed of rotation of the dynamometer rollers in proportion to the ramp signal.
Claim 5
Dependent Claim
81 words
Apparatus, as claimed in claim 3, wherein the generator means comprises a store which may be selectively charged or discharged at a constant rate and wherein the speed control means further comprises means for comparing a velocity signal proportional to the speed of rotation of the dynamometer rollers with the ramp signal so that any error between the velocity signal and ramp signal produces an error signal that results in a corrective change in the torque generated by the brake means.
Claim 6
Dependent Claim
55 words
Apparatus, as claimed in claim 4, and further comprising switch means connected between the speed control means and the store, and means for manually operating the switch means in order to isolate the error signal from controlling the torque developed by the brake means and to charge the store in accordance with the speed signal.
Claim 7
Dependent Claim
37 words
Apparatus, as claimed in claim 2, wherein the control means comprises means for controlling the braking torque developed by the brake means so as to maintain the dynamometer acceleration at a predetermined constant positive or negative value.
Claim 8
Dependent Claim
14 words
Apparatus, as claimed in claim 6, wherein the means for transmitting comprises a potentiometer.
References Cited (Backward Citations)
US2982128A
Cited
US3554022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |