US3554170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetion control method for operating fuel injection spark-ignition internal combustion engines
Assignee: IHO Holding GmbH and Co KG
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Filing: 1969-01-27
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Granted: 1971-01-12
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Expires: 1989-01-27
Abstract
Abstract A method for operating an internal combustion engine of the fuel injection spark-ignition type, whereby at no-load idling speed the engine is operated under conditions of excess air relative to the stoichiometric mixture ratio, the degree of excess air being gradually diminished in conformity with the engine speed diminishing from the no-load idling speed.
Inventors
- 👤 Rudolf Schenk
- 👤 Kreis Starnberg
- 👤 Fritz Flory
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:20
CPC Classifications
F; F02; F02D; F02D3/00; F02D3/02; F02B; F02B1/00; F02B1/02; F02D9/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0225; F02D2700/0228; F02D2700/023; F02D2700/0241
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
194 words
A method of controlling a spark-ignition fuel injection internal combustion engine of the type wherein the fuel and air charge is distributed homogeneously throughout the cylinder, said method comprising the use of a control system and the preprogramming of same to automatically control the fuel-air ratio in the fuel-air mixture which is fed to the engine in relation to the engine speed, wherein said control system is so programmed as to provide at no-load idling speed an air ratio in said mixture of greater than the stoichiometric air ratio, and said system is further programmed to, at engine speeds below said no-load idling speed, provide an increase in fuel rate in accordance with a control curve plots to show the relationship between engine speed and fuel rate, the gradient of said curve along the fuel rate coordinate being greater than that which is necessary for maintaining the fuel to air ratio constant for noload idling speed and other lower idling speeds, whereby a decrease in the idling speed from no-load idling speed results in an increase in the fuel-air ratio towards the point along said curve corresponding to maximum torque output of the engine.
Claim 2
Independent Claim
194 words
A method of controlling a spark-ignition fuel injection internal combustion engine of the type wherein the fuel and air charge is distributed homogeneously throughout the cylinder, said method comprising the use of a control system and the preprogramming of same to automatically control the fuel-air ratio in the fuel-air mixture which is fed to the engine in relation to the engine speed, wherein said control system is so programmed as to provide at no-load idling speed an air ratio in said mixture of greater than the stoichiometric air ratio, and said system is further programmed to, at engine speeds below said no-load idling speed, provide an increase in fuel rate in accordance with a control curve plots to show the relationship between engine speed and fuel rate, the gradient of said curve along the fuel rate coordinate being greater than that which is necessary for maintaining the fuel to air ratio constant for noload idling speed and other lower idling speeds, whereby a decrease in the idling speed from no-load idling speed results in an increase in the fuel-air ratio towards the point along said curve corresponding to maximum torque output of the engine.
Claim 3
Dependent Claim
105 words
The method of claim 1, applied to a spark-ignition fuel injection internal combustion engine having a control system which receives signals indicative of the position of the throttle valve and of the engine speed, respectively, these signals being as a whole indicative of the air flow in the induction pipe of the engine and acting upon a device on which the necessary control curves for obtaining the fuel-air ratio desired for each operating point of the engine are recorded to provide a control signal acting upon the fuel injection pump of the engine to adjust the fuel quantity to be delivered by the injection pump.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |