Patent US4593667A successfully refreshed from Google Patents.
US4593667A
Expired / Lapsed
US
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Engine control device
Assignee: Hitachi Ltd
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Filing: 1985-03-19
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Granted: 1986-06-10
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Expires: 2005-03-19
Abstract
Abstract The present invention relates to an engine control device adapted to determine a basic fuel feed rate (Tp) in response to signals from a suction air flow rate sensor (20) and an air-fuel ratio sensor (20), and thereafter a fuel feed rate (Ti). According to the present invention, suction air flow rates (Q An-1 , Q An-2 ) are calculated first on the basis of the last and the next to last fuel feed rates (Tin-1, Tin-2). The coefficients (A, B) required to correct the properties of the suction air flow rate sensor (20) are computed on the basis of these suction air flow rates. In the present invention, a fuel feed rate is determined finally on the basis of these coefficients.
Inventors
- 👤 Shoji Sasaki
- 👤 Yasunori Mori
- 👤 Noboru Sugiura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:39
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/14; F02D41/1438; F02D41/1486; F02D41/1487; F02D41/187; F02B; F02B1/00; F02B1/02; F02B1/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
198 words
An engine control device having a sensor for measuring flow rate of the suction air, a sensor for measuring an output air-fuel ratio, and adapted to determine a basic fuel feed rate on the basis of said flow rate of the suction air, and correct said basic fuel feed rate on the basis of said output air-fuel ratio, whereby a fuel feed rate is finally determined, comprising a means (S19) for calculating an actual flow rate of the suction air on the basis of said finally-determined fuel feed rate, a means (S20) for calculating on the basis of said actual flow rate of the suction air a coefficient which is required to correct the properties of said sensor (20) for measuring a flow rate of the suction air, a means (S7) for correcting said flow rate of the suction air on the basis of said coefficient before taking the data (Vo) on the flow rate of the suction air from said sensor (20) for measuring a flow rate of the suction air, and a means (S8) for determining a fuel feed rate (Ti) on the basis of a corrected flow rate (Q A ) of the suction air.
Claim 2
Dependent Claim
198 words
An engine control device having a sensor for measuring flow rate of the suction air, a sensor for measuring an output air-fuel ratio, and adapted to determine a basic fuel feed rate on the basis of said flow rate of the suction air, and correct said basic fuel feed rate on the basis of said output air-fuel ratio, whereby a fuel feed rate is finally determined, comprising a means (S19) for calculating an actual flow rate of the suction air on the basis of said finally-determined fuel feed rate, a means (S20) for calculating on the basis of said actual flow rate of the suction air a coefficient which is required to correct the properties of said sensor (20) for measuring a flow rate of the suction air, a means (S7) for correcting said flow rate of the suction air on the basis of said coefficient before taking the data (Vo) on the flow rate of the suction air from said sensor (20) for measuring a flow rate of the suction air, and a means (S8) for determining a fuel feed rate (Ti) on the basis of a corrected flow rate (Q A ) of the suction air.
Claim 3
Dependent Claim
61 words
An engine control device according to claim 1, wherein said means for calculating the flow rate of the suction air consists of an arithmetic circuit adapted to compute a coefficient, which is required to correct the properties of said sensor (20), on the basis of the data on the recorded engine r.p.m. and the data on the recorded fuel injection time.
Claim 4
Dependent Claim
70 words
An engine control device according to claim 1, wherein said means for calculating a coefficient which is required to correct the properties of said sensor for measuring a flow rate of the suction air consists of an arithmetic circuit adapted to compute a coefficient, which is required to correct the properties of said sensor (20), on the basis of the data on the recorded flow rate of the suction air.
Claim 5
Dependent Claim
54 words
An engine control device according to claim 1, wherein said means for correcting said flow rate of the suction air consists of an arithmetic circuit adapted to compute a present flow rate (Q A ) on the basis of the present data (Vo) on the flow rate of the suction air and said coefficient.
Claim 6
Dependent Claim
122 words
An engine control device according to claim 1, wherein said means for determining a fuel feed rate consists of an arithmetic circuit adapted to determine an engine load (Tp=K·Q A /N, wherein N is the present engine r.p.m.), and thereafter compute said fuel feed rate (Ti=Tp·α(1+K TW +K TA ), wherein α is a coefficient determined on the basis of the data λ on an air-fuel ratio, K TW a correction coefficient based on the temperature data obtained from a water temperature sensor which is provided in a cooling water passage in said engine, and K TA a correction coefficient based on the suction air temperature data TA obtained from a suction air temperature sensor which is provided in a suction pipe).
Claim 7
Dependent Claim
69 words
An engine control device according to claim 1, wherein said means for calculating a coefficient which is required to correct the properties of said sensor for measuring a flow rate, which corresponds to various data (Vo1, Vo2, Vo3, . . . Vom) thereon, of the suction air has a memory (S21) for storing in a divided state a coefficient which is required to correct the properties of said sensor.
Claim 8
Dependent Claim
34 words
An engine control device according to claim 6, wherein said coefficient corresponding to said data in said memory on the flow rate of the suction air is rewritten when the engine load is low.
Claim 9
Dependent Claim
35 words
An engine control device according to claim 6, wherein said coefficient corresponding to said data in said memory on the flow rate of the suction air is not rewritten when the engine load is high.
Claim 10
Dependent Claim
39 words
An engine control device according to claim 6, wherein said coefficient corresponding to said data in said memory on the flow rate of the suction air is not rewritten immediately after the engine load varies from high to low.
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) | 1989-06-09 | 1989-12-09 | 1990-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-09 | 1993-12-09 | 1994-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-09 | 1997-12-09 | 1998-06-10 | $7700.00 | Window Closed / Lapsed |