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US5067460A Expired / Lapsed US ⏱️ 0.0 years remaining

Variable air/fuel ratio engine control system with closed-loop control around maximum efficiency and combination of Otto-diesel throttling

Assignee: Massachusetts Institute of Technology
•
Filing: 1991-05-22
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Granted: 1991-11-26
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Expires: 2011-05-22
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Abstract

Abstract System for controlling a spark ignition engine to maximize fuel efficiency over its entire range of operating conditions. The system includes apparatus for controlling the amount of fuel delivered to the engine and apparatus for measuring the internal cylinder pressure in at least one cylinder of the engine. Apparatus is provided for estimating the air mass entering the engine and computing apparatus calculates the engine efficiency from the amount of fuel delivered, the internal cylinder pressure and the estimated air mass entering the engine. In one embodiment, efficiency is measured by calculation of the approximate indicated specific fuel consumption. Apparatus is provided for varying the amount of fuel delivered to the engine to minimize the indicated specific fuel consumption over the entire range of operating conditions of the engine. In this embodiment, apparatus is provided which is responsive to a desired engine power output beyond wide open throttle plate and apparatus is provided for delivering a greater quantity of fuel beyond the wide open throttle plate position maximum efficiency point.

Inventors

  • 👤 Edward Van Duyne

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-29 05:50
CPC Classifications
F; F02; F02D; F02D35/00; F02D35/02; F02D35/023; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D41/1406; F02D41/18; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 74 words
Throttle input device comprising: a first disk connected to a throttle pedal cable, the first disk arranged to rotate a shaft of a potentiometer; a second disk arranged to rotate a throttle plate from a closed to a wide open position; and apparatus to constrain the first and second disks to rotate together until the throttle plate reaches the wide open position, and to allow the first disk alone to continue to rotate thereafter.
Claim 2
Dependent Claim 74 words
Throttle input device comprising: a first disk connected to a throttle pedal cable, the first disk arranged to rotate a shaft of a potentiometer; a second disk arranged to rotate a throttle plate from a closed to a wide open position; and apparatus to constrain the first and second disks to rotate together until the throttle plate reaches the wide open position, and to allow the first disk alone to continue to rotate thereafter.
Claim 3
Dependent Claim 19 words
The throttle input device of claim 1 wherein the apparatus to constrain the first and second disks comprises springs.

References Cited (Backward Citations)

US4409940A Cited
US4688533A Cited
US4698535A Cited
US4892071A Cited
US4836167A Cited
US4877005A Cited
US5016586A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1994-11-25 1995-05-27 1995-11-26 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1998-11-25 1999-05-27 1999-11-26 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2002-11-25 2003-05-27 2003-11-26 $7700.00 Window Closed / Lapsed

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