US3673796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anticipating air injection system for turbocharged engines
Assignee: Caterpillar Inc
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Filing: 1970-03-03
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Granted: 1972-07-04
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Expires: 1990-03-03
Abstract
Abstract An air injection system for turbocharged engines wherein air is released from a container and injected into the engine manifold in response to a signal representing a change in the magnitude of the load driven by the engine includes a valve means for isolating the turbocharger from the manifold during the time the air is injected and until the pressure in the manifold falls below the turbocharger discharge pressure during which time the turbocharger increases its speed whereby engine speed deviations are minimized.
Inventors
- 👤 Louis F Weick
- 👤 William F Linne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:03
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D29/00; F02D35/00; F02D35/0015; F02D35/0023; F02D35/0038; F02D9/00; F02B; F02B3/00; F02B3/06; F02D41/0002; F02D2041/0022; F02D2700/00; F02D2700/02; F02D2700/0269; F02D2700/0274; F02D2700/0279; F02D2700/07; F02D41/40; F02D41/406; F02D41/407
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
213 words
In combination with a turbocharged engine having an intake manifold and a fuel control system which drives a variable load requiring essentially a constant driving speed, and anticipating engine speed control system comprising: sensing means associated with said variable load and operable to produce a signal proportional to its detected load variations in said variable load prior to the occurrence of speed changes in said turbocharged engine that normally would result from increased horsepower loading thereon; a tank of pressurized air connected to said intake manifold of said turbocharged engine and maintained at a predetermined pressure: means to maintain the pressure in said tank of pressurized air; controllable valve means between said source of pressurized air and its connection to said intake manifold to control the flow of said pressurized air therebetween; a pressure actuated flapper valve between said intake manifold and its turbocharger; and circuit means coupled to said sensing means and to said controllable valve means whereby said valve means is actuated to temporarily supply a single continuous pulse of said pressurized air to said intake manifold causing temporary closing of said flapper valve when engine horsepower output is required to be increased to minimize speed variations in said turbocharged engine because of increased loading thereon by temporarily unloading said turbocharger.
Claim 2
Dependent Claim
213 words
In combination with a turbocharged engine having an intake manifold and a fuel control system which drives a variable load requiring essentially a constant driving speed, and anticipating engine speed control system comprising: sensing means associated with said variable load and operable to produce a signal proportional to its detected load variations in said variable load prior to the occurrence of speed changes in said turbocharged engine that normally would result from increased horsepower loading thereon; a tank of pressurized air connected to said intake manifold of said turbocharged engine and maintained at a predetermined pressure: means to maintain the pressure in said tank of pressurized air; controllable valve means between said source of pressurized air and its connection to said intake manifold to control the flow of said pressurized air therebetween; a pressure actuated flapper valve between said intake manifold and its turbocharger; and circuit means coupled to said sensing means and to said controllable valve means whereby said valve means is actuated to temporarily supply a single continuous pulse of said pressurized air to said intake manifold causing temporary closing of said flapper valve when engine horsepower output is required to be increased to minimize speed variations in said turbocharged engine because of increased loading thereon by temporarily unloading said turbocharger.
Claim 3
Dependent Claim
40 words
The combination defined in claim 1 wherein the sensing means is connected to the fuel control system of the turbocharged engine to immediately increase fuel flow to said turbocharged engine when the pressurized air is injected into the intake manifold.
Claim 4
Dependent Claim
28 words
The combination defined in claim 2 wherein the variable load requiring a constant speed is an alternator and the sensing means monitors the electrical load on said alternator.
Claim 5
Dependent Claim
16 words
The combination defined in claim 3 wherein the sensing means includes at least one current transformer.
Claim 6
Dependent Claim
19 words
The combination defined in claim 3 wherein said intake manifold includes a relief valve limiting the maximum pressure therein.
Claim 7
Dependent Claim
33 words
The combination defined in claim 3 wherein the circuit Means includes a switching circuit operable to actuate the control valve means at a preselected level of increased horsepower demand on the turbocharged engine.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |