US5203305A
Expired / Lapsed
US
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Apparatus and methods for converting conventionally fueled engines to operate on an alternative fuel
Assignee: Individual
•
Filing: 1992-06-25
•
Granted: 1993-04-20
•
Expires: 2012-06-25
Abstract
Abstract An apparatus and methods for converting fuel injected internal combustion engines normally operated with a conventional fuel such as gasoline to operate with an alternative fuel are disclosed. The methods include a synchronization method where an alternative fuel injector control signal is synchronized among two or more alternative fuel injectors throughout the engine's energy demand range; a method for transforming non-sequential conventional fuel injector control signals to individual cylinder timed alternative fuel injector control signals; a method for transforming sequential multi-port conventional fuel injector control signals to throttle body alternative fuel injector control signals; and a method which includes adjusting the timing of the start of the injection relative to the valve opening event as a function of fuel flow.
Inventors
- 👤 Fred C. Porter
- 👤 Garth J. Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:43
CPC Classifications
F; F02; F02D; F02D19/00; F02D19/02; F02D19/021; F02D19/023; F02D19/024; F02B; F02B69/00; F02D19/026; F02D19/027; F02D35/00; F02D41/00; F02D41/30; F02M; F02M21/00; F02M21/02; F02M21/0218; F02M21/0248; F02M21/0251; F02M21/0254; F02B1/00; F02B1/02; F02B1/04; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0606; F02M21/0278; F02M21/029; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/30
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
146 words
A method of operating an internal combustion engine with an alternative fuel, the method comprising the steps of: providing first and second alternative fuel injectors in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; and transmitting the final alternative fuel injector control signal to the first alternative fuel injector until the load on the engine increases past the capacity of the first alternative fuel injector, and thereafter transmitting the final alternative fuel injector control signal to the first and second alternative fuel injectors.
Claim 2
Independent Claim
146 words
A method of operating an internal combustion engine with an alternative fuel, the method comprising the steps of: providing first and second alternative fuel injectors in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; and transmitting the final alternative fuel injector control signal to the first alternative fuel injector until the load on the engine increases past the capacity of the first alternative fuel injector, and thereafter transmitting the final alternative fuel injector control signal to the first and second alternative fuel injectors.
Claim 3
Independent Claim
111 words
A method of operating an internal combustion engine with an alternative fuel, the method comprising the steps of: providing a plurality of alternative fuel injectors in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; and synchronizing the final alternative fuel injector control signal among the alternative fuel injectors.
Claim 4
Independent Claim
111 words
A method of operating an internal combustion engine with an alternative fuel, the method comprising the steps of: providing a plurality of alternative fuel injectors in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; and synchronizing the final alternative fuel injector control signal among the alternative fuel injectors.
Claim 5
Dependent Claim
36 words
The method of claim 2 further including the step of varying the timing of the start of the final alternative fuel injector control signal as a function of the fuel flow rate demanded by the engine
Claim 6
Independent Claim
204 words
A method of converting a conventionally fueled internal combustion engine to operate with an alternative fuel, the engine having an electronic control module which generates a control signal to a conventional fuel injector, the engine also having a valve which cycles through a valve opening event, the method comprising the steps of: providing an alternative fuel injector in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; establishing the time (t.sub.α) between the control signal to the conventional fuel injector and a point of the valve opening event; establishing the time (t.sub.β) between the point of the valve opening event and the optimum point at which to actuate the alternative fuel injector; adjusting the final alternative fuel injector control signal as a function of t.sub.α and t.sub.β ; and transmitting the final alternative fuel injector control signal to the alternative fuel injector.
Claim 7
Independent Claim
204 words
A method of converting a conventionally fueled internal combustion engine to operate with an alternative fuel, the engine having an electronic control module which generates a control signal to a conventional fuel injector, the engine also having a valve which cycles through a valve opening event, the method comprising the steps of: providing an alternative fuel injector in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; establishing the time (t.sub.α) between the control signal to the conventional fuel injector and a point of the valve opening event; establishing the time (t.sub.β) between the point of the valve opening event and the optimum point at which to actuate the alternative fuel injector; adjusting the final alternative fuel injector control signal as a function of t.sub.α and t.sub.β ; and transmitting the final alternative fuel injector control signal to the alternative fuel injector.
Claim 8
Dependent Claim
36 words
The method of claim 4 further including the step of adjusting the alternative fuel injector control signal as a function of the time (t inj ) between successive control signals generated by the electronic control module.
Claim 9
Dependent Claim
37 words
The method of claim 5 wherein the alternative fuel injector control signal is adjusted to begin at a time equal to t inj +t.sub.α -t.sub.β after the first referenced control signal generated by the electronic control module.
Claim 10
Dependent Claim
37 words
The method of claim 5 wherein the alternative fuel injector control signal is adjusted to begin at a time equal to (t inj ÷3)+t.sub.α -t.sub.β after the first referenced control signal generated by the electronic control module.
Claim 11
Dependent Claim
36 words
The method of claim 4 further including the step of varying the timing of the start of the final alternative fuel injector control signal as a function of the fuel flow rate demanded by the engine.
Claim 12
Dependent Claim
19 words
The method of claim 4 wherein the point of the valve opening event is the valve being fully open.
Claim 13
Dependent Claim
13 words
The method of claim 4 wherein the time (t.sub.α) is established by measurement.
Claim 14
Dependent Claim
13 words
The method of claim 4 wherein the time (t.sub.β) is established by experiment.
Claim 15
Dependent Claim
18 words
The method of claim 4 wherein the alternative fuel injector is adapted for use as a port injector.
Claim 16
Dependent Claim
19 words
The method of claim 4 wherein the alternative fuel injector is adapted for use as a throttle body injector.
Claim 17
Independent Claim
137 words
A method of converting a conventionally fueled internal combustion engine to operate with an alternative fuel, the engine having an electronic control module which generates a control signal to a conventional fuel injector, the method comprising the steps of: providing a plurality of throttle body alternative fuel injectors in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; and alternately transmitting the final alternative fuel injector control signal among the throttle body alternative fuel injectors.
Claim 18
Independent Claim
137 words
A method of converting a conventionally fueled internal combustion engine to operate with an alternative fuel, the engine having an electronic control module which generates a control signal to a conventional fuel injector, the method comprising the steps of: providing a plurality of throttle body alternative fuel injectors in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; and alternately transmitting the final alternative fuel injector control signal among the throttle body alternative fuel injectors.
Claim 19
Dependent Claim
36 words
The method of claim 14 further including the step of varying the timing of the start of the final alternative fuel injector control signal as a function of the fuel flow rate demanded by the engine.
Claim 20
Independent Claim
156 words
A method of converting a conventionally fueled internal combustion engine to operate with an alternative fuel, the engine having an electronic control module which generates a control signal to a conventional fuel injector, the method comprising the steps of: providing an alternative fuel injector in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; varying the timing of the start of the final alternative fuel injector control signal as a function of the fuel flow rate demanded by the engine; and transmitting the final alternative fuel injector control signal to the alternative fuel injector.
Claim 21
Independent Claim
156 words
A method of converting a conventionally fueled internal combustion engine to operate with an alternative fuel, the engine having an electronic control module which generates a control signal to a conventional fuel injector, the method comprising the steps of: providing an alternative fuel injector in fluid communication with the alternative fuel; measuring the temperature of the alternative fuel; generating an intermediate alternative fuel injector control signal in response to the temperature of the alternative fuel and the energy content differential of conventional fuel and the alternative fuel; adjusting the intermediate alternative fuel injector control signal to a final alternative fuel injector control signal in accordance with the flow and operating characteristics of the alternative fuel injector; varying the timing of the start of the final alternative fuel injector control signal as a function of the fuel flow rate demanded by the engine; and transmitting the final alternative fuel injector control signal to the alternative fuel injector.
References Cited (Backward Citations)
US4181100A
Cited
US4112875A
Cited
US4495930A
Cited
US4635608A
Cited
US4711223A
Cited
US4531497A
Cited
US4537172A
Cited
US4617904A
Cited
US4553504A
Cited
US4632083A
Cited
US4922862A
Cited
US4889097A
Cited
US4876988A
Cited
US4865001A
Cited
US4989570A
Cited
US4955345A
Cited
US5150690A
Cited
US5003956A
Cited
US4995367A
Cited
US5092305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-04-19 | 1996-10-19 | 1997-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-19 | 2000-10-19 | 2001-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-19 | 2004-10-19 | 2005-04-20 | $7700.00 | Window Closed / Lapsed |