US3604254A
Expired / Lapsed
US
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Test method and apparatus for charge forming devices
Assignee: Ametek Inc
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Filing: 1969-09-17
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Granted: 1971-09-14
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Expires: 1989-09-17
Abstract
Abstract A method and apparatus for accurately calibrating and adjusting charge forming devices for internal combustion engines under conditions accurately simulating actual operating conditions. The charge forming device induction passage is placed in a fluid circuit that includes a sonic nozzle with a throttle valve being interposed between the charge forming device induction passage and the sonic nozzle. The sonic nozzle has the characteristic that at pressure differentials greater than a predetermined critical pressure differential the flow velocity through the throat is maintained at the sonic velocity. A pressure differential is established across the sonic nozzle, which pressure differential is greater than this critical pressure and by interrelating the operation of the throttle valve of the charge-forming device and the throttle valve of the test apparatus, the critical pressure ratio is maintained while various engine-operating conditions are simulated. The air and fuel flow through the carburetor can then be accurately measured at these varying conditions.
Inventors
- 👤 Joseph Sabuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:23
CPC Classifications
F; F02; F02M; F02M19/00; F02M19/01; G; G01; G01M; G01M13/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
183 words
A test apparatus for calibrating a charge-forming device having an induction passage, throttle valve for controlling the flow through the induction passage and a fuel discharge circuit for discharging fuel into the induction passage, said apparatus comprising a base adapted to support a charge-forming device, air conduit means adapted to register with the induction passage of the supported charge-forming device, means for creating a pressure differential in said air conduit means for inducing flow through the charge-forming device induction passage, a sonic flow device interposed in said air conduit, said sonic flow device having an area wherein the flow velocity at said area is equal to the sonic velocity of the fluid flowing therethrough at a critical pressure differential and which velocity does not exceed said sonic velocity at a greater pressure differential than said critical pressure differeNtial, throttle valve means interposed in said air conduit between said sonic flow device and the induction passage of the charge-forming device for changing the pressure drop across the charge-forming device and means for fuel the flue flow through the discharge circuit of the charge-forming device.
Claim 2
Dependent Claim
183 words
A test apparatus for calibrating a charge-forming device having an induction passage, throttle valve for controlling the flow through the induction passage and a fuel discharge circuit for discharging fuel into the induction passage, said apparatus comprising a base adapted to support a charge-forming device, air conduit means adapted to register with the induction passage of the supported charge-forming device, means for creating a pressure differential in said air conduit means for inducing flow through the charge-forming device induction passage, a sonic flow device interposed in said air conduit, said sonic flow device having an area wherein the flow velocity at said area is equal to the sonic velocity of the fluid flowing therethrough at a critical pressure differential and which velocity does not exceed said sonic velocity at a greater pressure differential than said critical pressure differeNtial, throttle valve means interposed in said air conduit between said sonic flow device and the induction passage of the charge-forming device for changing the pressure drop across the charge-forming device and means for fuel the flue flow through the discharge circuit of the charge-forming device.
Claim 3
Dependent Claim
67 words
A test apparatus as set forth in claim 1 wherein the sonic flow device is positioned downstream of the base and of the charge-forming device induction passage, the throttle valve means being positioned between the charge-forming device induction passage and the sonic flow device, the means for inducing a flow through the charge-forming device induction passage comprising a vacuum pump positioned downstream of the sonic flow device.
Claim 4
Dependent Claim
40 words
A test apparatus as set forth in claim 1 wherein there are a plurality of sonic flow devices each sized to accommodate a different flow condition and valve means for controlling the flow through each of said sonic flow devices.
Claim 5
Dependent Claim
27 words
A test apparatus as set forth in claim 3 wherein there is one throttle valve means interposed between all of the sonic nozzles and the charge-forming device.
Claim 6
Independent Claim
205 words
The method of calibrating a charge-forming device over a simulated speed range at a fixed throttle valve setting wherein the charge-forming device has an induction passage, fuel discharge means for discharging fuel into the induction passage and throttle valve for controlling the flow through the induction passage, said method comprising the steps of placing the charge forming device induction passage in circuit with a sonic flow device having an area wherein the flow velocity at the area is substantially equal to the sonic velocity of the fluid flowing therethrough at a critical pressure differential which velocity does not substantially exceed the sonic velocity at a greater pressure differential than the critical pressure differential, establishing a flow through the charge-forming device induction passage and through the sonic flow device in series by establishing a pressure differential across the sonic flow device, throttling the flow in an area between the sonic flow device and the charge forming device induction passage independently of movement of the throttle valve of the charge forming device for altering the flow rate through the charge-forming device induction passage while maintaining at least the critical pressure difference across the sonic flow device, and measuring the flow of fuel discharged by the charge-forming device.
Claim 7
Independent Claim
205 words
The method of calibrating a charge-forming device over a simulated speed range at a fixed throttle valve setting wherein the charge-forming device has an induction passage, fuel discharge means for discharging fuel into the induction passage and throttle valve for controlling the flow through the induction passage, said method comprising the steps of placing the charge forming device induction passage in circuit with a sonic flow device having an area wherein the flow velocity at the area is substantially equal to the sonic velocity of the fluid flowing therethrough at a critical pressure differential which velocity does not substantially exceed the sonic velocity at a greater pressure differential than the critical pressure differential, establishing a flow through the charge-forming device induction passage and through the sonic flow device in series by establishing a pressure differential across the sonic flow device, throttling the flow in an area between the sonic flow device and the charge forming device induction passage independently of movement of the throttle valve of the charge forming device for altering the flow rate through the charge-forming device induction passage while maintaining at least the critical pressure difference across the sonic flow device, and measuring the flow of fuel discharged by the charge-forming device.
Claim 8
Dependent Claim
94 words
A method of calibrating a charge-forming device as set forth in claim 5 wherein the calibration is further accomplished over a range of settings of the throttle valve of the charge-forming device, said method further including the step of altering the position of the throttle valve of the charge-forming device and simultaneously varying the amount of throttling of the airflow to establish the desired flow rate through the charge-forming device induction passage at desired settings of the throttle valve of the charge-forming device while maintaining the critical pressure differential upon the sonic flow device.
Claim 9
Independent Claim
190 words
The method of calibrating a charge-forming device at a fixed mass flow rate and over varying positions of the throttle valve of the charge-forming device wherein the charge-forming device includes an induction passage, fuel discharge means for discharging fuel into the induction passage and a throttle valve for controlling the flow through the induction passage, said method comprising the steps of placing the charge-forming device induction passage in circuit with a sonic flow device having an area wherein the flow velocity is substantially equal to the sonic velocity of the fluid flowing therethrough at a critical pressure differential and which velocity does not substantially exceed said sonic velocity at a greater pressure differential than said critical pressure differential, establishing a flow through the charge-forming device induction passage and through the sonic flow device, simuLtaneously altering the position of the charge-forming device throttle valve and throttling the established flow at a point between the sonic flow device and the charge-forming device induction passage for maintaining the desired flow rate while maintaining a critical pressure difference upon said sonic flow device, and measuring the rate of fuel discharge of the charge-forming device.
Claim 10
Independent Claim
190 words
The method of calibrating a charge-forming device at a fixed mass flow rate and over varying positions of the throttle valve of the charge-forming device wherein the charge-forming device includes an induction passage, fuel discharge means for discharging fuel into the induction passage and a throttle valve for controlling the flow through the induction passage, said method comprising the steps of placing the charge-forming device induction passage in circuit with a sonic flow device having an area wherein the flow velocity is substantially equal to the sonic velocity of the fluid flowing therethrough at a critical pressure differential and which velocity does not substantially exceed said sonic velocity at a greater pressure differential than said critical pressure differential, establishing a flow through the charge-forming device induction passage and through the sonic flow device, simuLtaneously altering the position of the charge-forming device throttle valve and throttling the established flow at a point between the sonic flow device and the charge-forming device induction passage for maintaining the desired flow rate while maintaining a critical pressure difference upon said sonic flow device, and measuring the rate of fuel discharge of the charge-forming device.
References Cited (Backward Citations)
US2597231A
Cited
US3434341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |