US3757570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Simulated load for internal combustion engines
Assignee: RCA Corp
•
Filing: 1971-10-06
•
Granted: 1973-09-11
•
Expires: 1991-10-06
Abstract
Abstract Apparatus and process for testing and analyzing the overall performance of an internal combustion engine by providing a simulated load to the engine. The simulated load is effected by periodically interrupting the engine ignition to reduce the total developed power of the engine to a value equal to the frictional horsepower at a desired speed. The period of the interruption cycle is controlled in response to the desired speed.
Inventors
- 👤 R Cowley
- 👤 L Hulls
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:49
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/042; G01M15/044
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
127 words
Apparatus for providing a simulated load to an internal combustion engine having an ignitiOn system to produce ignition, comprising: first means for inhibiting said ignition in response to a control signal; and second means for providing a variable inhibit period, and including third means for detecting the speed of said engine, comparison means having a first input coupled to said third means, said comparison means having a second input coupled to a reference means for comparing said speed to said reference means, said second means further including output means coupling said comparison means to said first means to provide said control signal in response to variations of said speed about the reference means for inhibiting said ignition during said period when said speed exceeds said reference means.
Claim 2
Dependent Claim
127 words
Apparatus for providing a simulated load to an internal combustion engine having an ignitiOn system to produce ignition, comprising: first means for inhibiting said ignition in response to a control signal; and second means for providing a variable inhibit period, and including third means for detecting the speed of said engine, comparison means having a first input coupled to said third means, said comparison means having a second input coupled to a reference means for comparing said speed to said reference means, said second means further including output means coupling said comparison means to said first means to provide said control signal in response to variations of said speed about the reference means for inhibiting said ignition during said period when said speed exceeds said reference means.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein said third means includes tachometer means coupled to said engine.
Claim 4
Dependent Claim
13 words
The apparatus of claim 2 wherein said reference means includes reference speed means.
Claim 5
Dependent Claim
14 words
The apparatus of claim 3 wherein said reference speed means includes adjustable speed means.
Claim 6
Independent Claim
129 words
A method for loading an internal combustion engine with a simulated load equivalent to a given actual load, said engine having at least one cylinder and having a throttle which alters the speed of said engine in accordance with throttle settings, said method comprising the steps of: periodically inhibiting the occurrence of cylinder ignition to adjust the indicated horsepower of said engine to a value substantially equal to the frictional horsepower of said engine at a given speed, thereby to provide a resulting substantially constant engine speed equal to said given speed; and adjusting said throttle to its wide-open-throttle setting wherein the accompanying resulting engine speed corresponds to the engine speed which would result if said engine were actually loaded with said given actual load at said wide-open-throttle setting.
Claim 7
Independent Claim
129 words
A method for loading an internal combustion engine with a simulated load equivalent to a given actual load, said engine having at least one cylinder and having a throttle which alters the speed of said engine in accordance with throttle settings, said method comprising the steps of: periodically inhibiting the occurrence of cylinder ignition to adjust the indicated horsepower of said engine to a value substantially equal to the frictional horsepower of said engine at a given speed, thereby to provide a resulting substantially constant engine speed equal to said given speed; and adjusting said throttle to its wide-open-throttle setting wherein the accompanying resulting engine speed corresponds to the engine speed which would result if said engine were actually loaded with said given actual load at said wide-open-throttle setting.
Claim 8
Independent Claim
137 words
A method for loading an internal combustion engine with a simulated load equivalent to a given actual load, said engine having a throttle for altering the speed of said engine in accordance with throttle settings, said method comprising the steps of: detecting the speed of said engine; comparing the speed of said engine to a reference speed to provide an error signal indicative of the difference between the engine speed and the reference speed; adjusting the indicated horsepower of said engine in response to said error signal to control the speed of said engine to a value substantially equal to said reference speed, thereby to provide a throttle setting and engine speed which is substnatially equivalent to the throttle setting and engine speed which would result if said engine were actually loaded with said given actual load.
Claim 9
Independent Claim
137 words
A method for loading an internal combustion engine with a simulated load equivalent to a given actual load, said engine having a throttle for altering the speed of said engine in accordance with throttle settings, said method comprising the steps of: detecting the speed of said engine; comparing the speed of said engine to a reference speed to provide an error signal indicative of the difference between the engine speed and the reference speed; adjusting the indicated horsepower of said engine in response to said error signal to control the speed of said engine to a value substantially equal to said reference speed, thereby to provide a throttle setting and engine speed which is substnatially equivalent to the throttle setting and engine speed which would result if said engine were actually loaded with said given actual load.
Claim 10
Independent Claim
132 words
A method for loading an internal combustion engine with a simulated load equivalent to a given actual load, said engine having at least one cylinder and having a throttle which normally controls the speed of said engine between minimum and maximum speed values, said method comprising the steps of: periodically inhibiting cylinder ignition of said engine to reduce the indicated horsepower developed by said engine to a value substantially equal to a selected frictional horsepower, which frictional horsepower corresponds to a given speed of said engine, thereby to provide a a substantially constant engine speed equal to said given speed; and adjusting said throttle to any desired throttle setting corresponding to the throttle setting which would result if said engine were actually loaded with said given actual load at said given speed.
Claim 11
Independent Claim
132 words
A method for loading an internal combustion engine with a simulated load equivalent to a given actual load, said engine having at least one cylinder and having a throttle which normally controls the speed of said engine between minimum and maximum speed values, said method comprising the steps of: periodically inhibiting cylinder ignition of said engine to reduce the indicated horsepower developed by said engine to a value substantially equal to a selected frictional horsepower, which frictional horsepower corresponds to a given speed of said engine, thereby to provide a a substantially constant engine speed equal to said given speed; and adjusting said throttle to any desired throttle setting corresponding to the throttle setting which would result if said engine were actually loaded with said given actual load at said given speed.
Claim 12
Dependent Claim
25 words
The method according to claim 7 including the step of adjusting the inhibit cycle in response to engine speed variations from said substantially constant speed.
Claim 13
Dependent Claim
175 words
Apparatus for providing a simulated load to an internal combustion engine, said engine having a throttle which normally controls the speed of said engine between minimum and maximum speed values and having an ignition system which normally provides ignition periods at a rate related to the speed of said engine, comprising: first means for detecting the speed of said engine and for producing an output signal which is related to the speed of said engine; second means for providing a reference speed signal which represents a given speed of said engine; comparison means coupled to said first and second means for comparing the detected speed of said engine with the reference speed to provide a control signal representative of the difference between said detected speed and said reference speed; and means coupling said comparison means to said ignition system for inhibiting the occurrence of ignition in response to said control signal to substantially maintain the speed of said engine at said given speed at any given throttle setting between said minimum and maximum speed values.
Claim 14
Dependent Claim
175 words
Apparatus for providing a simulated load to an internal combustion engine, said engine having a throttle which normally controls the speed of said engine between minimum and maximum speed values and having an ignition system which normally provides ignition periods at a rate related to the speed of said engine, comprising: first means for detecting the speed of said engine and for producing an output signal which is related to the speed of said engine; second means for providing a reference speed signal which represents a given speed of said engine; comparison means coupled to said first and second means for comparing the detected speed of said engine with the reference speed to provide a control signal representative of the difference between said detected speed and said reference speed; and means coupling said comparison means to said ignition system for inhibiting the occurrence of ignition in response to said control signal to substantially maintain the speed of said engine at said given speed at any given throttle setting between said minimum and maximum speed values.
Claim 15
Dependent Claim
32 words
The apparatus according to claim 9 wherein said second means includes means for adjusting said reference speed signal between minimum and maximum representative speeds corresponding to said minimum and maximum speed values.
Claim 16
Independent Claim
143 words
A method for testing an internal combustion engine in a simulated environment wherein said engine is operated with a simulated load equivalent to a given actual load, said engine having a throttle which alters the speed of said engine in accordance with throttle settings, said method comprising the steps of: periodically inhibiting the ignition of said engine in a predetermined ignition-on to ignition-on plus ignition-off ratio at which ratio the indicated horsepower developed by said engine is substantially equal to the frictional horsepower of said engine at a given engine speed so that a substantially constant engine speed equal to said given engine speed results; and adjusting said throttle to any desired setting so that each throttle setting corresponds to the throttle setting which would result if said engine were actually loaded with said given actual load at said resulting constant engine speed.
Claim 17
Independent Claim
143 words
A method for testing an internal combustion engine in a simulated environment wherein said engine is operated with a simulated load equivalent to a given actual load, said engine having a throttle which alters the speed of said engine in accordance with throttle settings, said method comprising the steps of: periodically inhibiting the ignition of said engine in a predetermined ignition-on to ignition-on plus ignition-off ratio at which ratio the indicated horsepower developed by said engine is substantially equal to the frictional horsepower of said engine at a given engine speed so that a substantially constant engine speed equal to said given engine speed results; and adjusting said throttle to any desired setting so that each throttle setting corresponds to the throttle setting which would result if said engine were actually loaded with said given actual load at said resulting constant engine speed.
References Cited (Backward Citations)
US2712814A
Cited
US3374667A
Cited
US3356082A
Cited
US3400579A
Cited
US3430615A
Cited
US3543572A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |