Patent US4928655A successfully refreshed from Google Patents.
US4928655A
Expired / Lapsed
US
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Fuel injection controller for an internal combustion engine
Assignee: Mitsubishi Electric Corp
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Filing: 1989-05-30
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Granted: 1990-05-29
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Expires: 2009-05-30
Abstract
Abstract A fuel control apparatus for an engine uses an N-bit low-resolution A/D converter to convert the analog output of an air intake pressure sensor. The N-bit output of the converter is multiplied by a prescribed constant to obtain a signal having at least (N+1) bits. The (N+1) bit signal is subjected to low-pass digital filtering and is used by a controller to calculate the pulse width to be applied to a fuel injector. A high resolution can be obtained using an inexpensive N-bit A/D converter.
Inventors
- 👤 Hajime Kako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:10
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/32; F02D41/34; F02D41/24; F02D41/26; F02D41/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A fuel controller for an engine equipped with a pressure sensor which generates an analog signal corresponding to the pressure in an air intake pipe of the engine, the fuel controller comprising: an N-bit A/D converter which performs A/D conversion of the analog signal of the pressure sensor and generates an N-bit digital signal; multiplying means for multiplying the N-bit digital signal by a prescribed constant to obtain a digital output signal having at least (N +1) bits; a low-pass digital filter which filters the output signal of said multiplying means and generates a filtered output; and control means for controlling the operation of a fuel injector of the engine in accordance with the filtered output so as to obtain a desired air/fuel ratio.
Claim 2
Dependent Claim
124 words
A fuel controller for an engine equipped with a pressure sensor which generates an analog signal corresponding to the pressure in an air intake pipe of the engine, the fuel controller comprising: an N-bit A/D converter which performs A/D conversion of the analog signal of the pressure sensor and generates an N-bit digital signal; multiplying means for multiplying the N-bit digital signal by a prescribed constant to obtain a digital output signal having at least (N +1) bits; a low-pass digital filter which filters the output signal of said multiplying means and generates a filtered output; and control means for controlling the operation of a fuel injector of the engine in accordance with the filtered output so as to obtain a desired air/fuel ratio.
Claim 3
Dependent Claim
23 words
A fuel controller as claimed in claim 1, wherein said A/D converter is an 8-bit A/D converter, and the prescribed constant is 4.
Claim 4
Dependent Claim
15 words
A fuel controller as claimed in claim 1, wherein said multiplying means comprises a microcomputer.
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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) | 1993-05-28 | 1993-11-27 | 1994-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-28 | 1997-11-27 | 1998-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-28 | 2001-11-27 | 2002-05-29 | $7700.00 | Window Closed / Lapsed |