US3926154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel control systems
Assignee: Lucas Electrical Co Ltd
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Filing: 1974-05-03
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Granted: 1975-12-16
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Expires: 1994-05-03
Abstract
Abstract A fuel control system for an internal combustion engine comprising sensing devices for sensing the quantities of oxygen and carbon monoxide or unburnt hydrocarbons in the engine exhaust emission, a temperature measuring device, a control device for controlling the rate of supply of fuel to the engine in accordance with at least one engine parameter and apparatus controlled by the sensing devices and by the temperature measuring device so as to modify the rate of fuel supply in accordance with the quantity of carbon monoxide or unburnt hydrocarbon in the exhaust emission when the engine temperature is below a predetermined value and in accordance with the quantity of oxygen in the exhaust emission when the engine temperature is above the predetermined temperature.
Inventors
- 👤 Malcolm Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:06
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1486; F02D41/1488; F02D41/149; F02D41/1439; F02D41/1441
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
140 words
A FUEL CONTROL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE COMPRISING MEANS FOR SENSING THE QUANTITY OF OXYGEN WITHIN THE EXHAUST EMISSION OF THE ENGINE MEANS FOR SENSING THE QUANTITY OF CARBON MONOXIDE OR UNBURNT HYDROCARBON WITHIN THE EXHAUST EMISSION, MEANS FOR MEASURING THE TEMPERATURE OF THE ENGINE, CONTROL MEANS FOR CONTROLLING THE RATE OF SUPPLY OF FULE TO THE ENGINE IN ACCORDANCE WITH AT LEAST ONE ENGINE PARAMETER, AND OPERATION MEANS COUPLED TO SAID ENGINE TEMPERATURE MEASURING MEANS AND TO SAID CONTROL MEANS FOR MODIFYING THE QUANTITY OF FUEL TO THE ENGINE IN ACCORDANCE WITH ENGINE TEMPERATURE AND THE QUANTITY OF CARBON MONOXIDE OR UNBURNT HYDROCARBON WITHIN THE EXHAUST EMISSION WHEN THE ENGINE TEMPERATURE IS BELOW A PREDETERMINED VALUE AND IN ACCORDANCE WITH THE QUANTITY OF OXYGEN WITHIN THE EXHAUST EMISSION WHEN THE ENGINE TEMPERATURE IS ABOVE SAID PREDETERMINED VALUE.
Claim 2
Dependent Claim
140 words
A FUEL CONTROL SYSTEM FOR AN INTERNAL COMBUSTION ENGINE COMPRISING MEANS FOR SENSING THE QUANTITY OF OXYGEN WITHIN THE EXHAUST EMISSION OF THE ENGINE MEANS FOR SENSING THE QUANTITY OF CARBON MONOXIDE OR UNBURNT HYDROCARBON WITHIN THE EXHAUST EMISSION, MEANS FOR MEASURING THE TEMPERATURE OF THE ENGINE, CONTROL MEANS FOR CONTROLLING THE RATE OF SUPPLY OF FULE TO THE ENGINE IN ACCORDANCE WITH AT LEAST ONE ENGINE PARAMETER, AND OPERATION MEANS COUPLED TO SAID ENGINE TEMPERATURE MEASURING MEANS AND TO SAID CONTROL MEANS FOR MODIFYING THE QUANTITY OF FUEL TO THE ENGINE IN ACCORDANCE WITH ENGINE TEMPERATURE AND THE QUANTITY OF CARBON MONOXIDE OR UNBURNT HYDROCARBON WITHIN THE EXHAUST EMISSION WHEN THE ENGINE TEMPERATURE IS BELOW A PREDETERMINED VALUE AND IN ACCORDANCE WITH THE QUANTITY OF OXYGEN WITHIN THE EXHAUST EMISSION WHEN THE ENGINE TEMPERATURE IS ABOVE SAID PREDETERMINED VALUE.
Claim 3
Dependent Claim
56 words
A fuel control system as claimed in claim 1 in which said means for sensing the quantity of oxygen and said means for sensing the quantity of carbon monoxide or unburnt hydrocarbon, each comprises a sensing device which produces an electrical output signal the amplitude of which is representative of the quantity of the appropriate gas.
Claim 4
Dependent Claim
29 words
A fuel control system as claimed in claim 2 including a low pass filter for each sensing device connected to reject high frequency components in said electrical output signals.
Claim 5
Dependent Claim
64 words
A fuel control system as claimed in claim 1 wherein said operation means includes logic means coupled to said engine temperature measuring means and to said oxygen sensing means and the sensing means for carbon monoxide or unburnt hydrocarbons for passing a signal from a selected one of said sensing means depending on whether the engine temperature is above or below said predetermined value.
Claim 6
Dependent Claim
63 words
A fuel control system as claimed in claim 4 wherein said operation means further comprises a comparator connected to said logic means for receiving the signal passed thereby, and means coupled to said engine temperature measuring means and to said comparator to provide a second signal to the comparator indicative of the required air/fuel ratio at the particular engine temperature which is measured.
Claim 7
Dependent Claim
40 words
A fuel control system as claimed in claim 1 wherein said control means includes means for making the air/fual ratio relatively rich when engine temperature is low and for making the air/fuel ratio relatively lean when engine temperature is high.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |