EP0719919A2
Expired / Lapsed
EP
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Fuel metering control system for internal combustion engine
Assignee: Honda Motor Co Ltd
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Filing: 1996-01-02
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Granted: —
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Expires: 2016-01-02
Abstract
Abstract A fuel metering control system for an internal combustion engine having a plurality of cylinders. The system includes an air/fuel ratio sensor and engine operating condition detecting means for detecting engine operating conditions such as engine speed and engine load. The basic quantity of fuel injection is determined by retrieving mapped data according to the detected parameters. A plurality of controllers are provided all using outputs of the air/fuel ratio sensor. The controllers are configured to receive the sensor outputs through filters having different cutout frequency so as to avoid control interference therebetween.
Inventors
- 👤 Hidetaka Maki
- 👤 Shusuke Akazaki
- 👤 Yusuke Hasegawa
- 👤 Isao Komoriya
- 👤 Yoichi Nishimura
- 👤 Toshiaki Hirota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 07:07
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/008; F02D41/02; F02D41/14; F02D41/1401; F02D41/1402; F02D41/1438; F02D41/1473; F02D2041/1409; F02D2041/1413; F02D2041/1415; F02D2041/1416; F02D2041/1417; F02D2041/1418; F02D2041/142; F02D2041/1426; F02D2041/1431; F02D2041/1433; F02D41/1444; F02D41/1454; F02D41/1456
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
174 words
A system for controlling fuel metering for an internal combustion engine having a plurality of cylinders, including: an air/fuel ratio sensor installed at an exhaust system of the engine for detecting an air/fuel ratio of the engine; engine operating condition detecting means for detecting engine operating conditions at least including engine speed and engine load; fuel injection quantity determining means for determining a quantity of fuel injection TiM-F, Tcyl for individual cylinders at least based on the detected engine operating conditions; feedback loops having a plurality of controllers that input an output of said air/fuel ratio sensor as a controlled variable and operate with a manipulated variable of the quantity of fuel injection to determine feedback correction coefficient KFB such that the controlled variable KACT, Gfuel is brought to a desired value KCMD, Gfuel-str; and a fuel injector for injecting fuel in the individual cylinders of the engine in response to the manipulated variable; wherein: at least one of the controllers is input with the output of the air/fuel ratio sensor through a filter.
Claim 2
Dependent Claim
31 words
A system according to claim 1, wherein said plurality of controllers are input with the output of the air/fuel ratio sensor through respective filters whose characteristics are different from each other.
Claim 3
Dependent Claim
97 words
A system according to claim 1 or 2, further including: individual cylinder air/fuel ratio estimating means comprising: a model describing behavior of the exhaust system of the engine and inputting an output of said air/fuel ratio sensor; observing means for observing an internal state of the exhaust system described by said model; and estimating means for estimating the air/fuel ratios of the individual cylinders based on an output of said observing means; and wherein at least one of the controllers calculates the feedback correction coefficient for individual cylinders of the engine based on the estimated air/fuel ratio.
Claim 4
Independent Claim
51 words
A system according to any of preceding claims 1 to 3, wherein at least one of the controllers is a controller based upon a control law expressed in a recursion formula and calculates the feedback correction coefficient using the controlled variable and the manipulated variable in accordance with the recursion formula.
Claim 5
Independent Claim
22 words
A system according to any of preceding claims 1 to 4, wherein at least one of the filters is a low-pass filter.
Claim 6
Independent Claim
144 words
A system according to any of preceding claims 1 to 5, further including: individual cylinder air/fuel ratio estimating means comprising: a model describing behavior of the exhaust system of the engine and inputting an output of said air/fuel ratio sensor through a first filter; observing means for observing an internal state of the exhaust system described by said model; and estimating means for estimating the air/fuel ratios of the individual cylinders based on an output of said observing means; and said plurality of controllers includes a first controller that calculates feedback correction coefficient based on the estimated air/fuel ratio, and a second controller using a control law expressed in a recursion formula that calculates a feedback correction coefficient using an input of the air/fuel ratio sensor through a second filter as the controlled variable and the manipulated variable in accordance with the recursion formula.
Claim 7
Dependent Claim
15 words
A system according to claim 6, wherein said first and second filters are low-pass filters.
Claim 8
Dependent Claim
25 words
A system according to claim 7, wherein the low-pass filter of the second filter has a cutout frequency less than that of the first filter.
Claim 9
Independent Claim
50 words
A system according to any of preceding claims 1 to 8, wherein at least one of the controllers is a controller using a control law expressed in a recursion formula and calculates the feedback correction coefficient using the controlled variable and the manipulated variable in accordance with the recursion formula.
References Cited (Backward Citations)
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