US5492101A
Expired / Lapsed
US
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Fuel injection control apparatus for an internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1994-12-12
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Granted: 1996-02-20
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Expires: 2014-12-12
Abstract
Abstract A fuel injection valve 15 is disposed in an intake passage 9 of an engine body 1. A combustion chamber 5 communicates with the intake passage 9 for introducing fuel injected from the fuel injection valve 15 at predetermined intake timings. A plurality of sensors are provided in the engine body 1 or fuel intake system for detecting various engine operational conditions including properties of fuel. A control unit 30 calculates a fuel quantity-of-state in the combustion chamber 5 in accordance with the engine operational conditions detected by the sensors, using an atomized fuel behavioral model representing behavior of fuel injected from the fuel injection valve 15, an intake passage fuel behavioral model representing fuel behavior in the intake passage 9 and a combustion chamber fuel behavioral model representing fuel behavior in the combustion chamber 5. Furthermore, the control unit 30 calculates a fuel injection amount required to adjust an actual gaseous air-fuel ratio in the combustion chamber 5 to a desired value in accordance with the fuel quantity-of-state thus calculated. The control unit 30 uses a cranking model as the combustion chamber fuel behavioral model before an initial explosion is detected and uses a firing model after the initial explosion is detected. The fuel injection valve 15 is opened or closed on the basis of the fuel injection amount thus calculated.
Inventors
- 👤 Kimitaka Saito
- 👤 Tetsuya Morino
- 👤 Keiso Takeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:13
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; F02D41/04; F02D41/047; F02D41/22; F02D41/221; F02B; F02B2275/00; F02B2275/14; F02D2041/1433; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
190 words
A fuel injection control apparatus for an internal combustion engine comprising: a fuel injection valve disposed in an intake passage; a combustion chamber communicated with the intake passage for introducing fuel injected from the fuel injection valve at predetermined intake timings; operational condition detecting means for detecting various operational conditions including properties of fuel; fuel quantity-of-state calculating means for calculating a fuel quantity-of-state in the combustion chamber in accordance with the operational conditions detected by the operational condition detecting means, using an atomized fuel behavioral model representing behavior of fuel injected from the fuel injection valve, an intake passage fuel behavioral model representing fuel behavior in the intake passage and a combustion chamber fuel behavioral model representing fuel behavior in the combustion chamber; injection amount calculating means for calculating a fuel injection amount required to adjust an actual gaseous air-fuel ratio in the combustion chamber to a desired value in accordance with the fuel quantity-of-state calculated by the fuel quantity-of-state calculating means; and injection valve actuating means for opening and closing the fuel injection valve on the basis of the fuel injection amount calculated by the injection amount calculating means.
Claim 2
Dependent Claim
190 words
A fuel injection control apparatus for an internal combustion engine comprising: a fuel injection valve disposed in an intake passage; a combustion chamber communicated with the intake passage for introducing fuel injected from the fuel injection valve at predetermined intake timings; operational condition detecting means for detecting various operational conditions including properties of fuel; fuel quantity-of-state calculating means for calculating a fuel quantity-of-state in the combustion chamber in accordance with the operational conditions detected by the operational condition detecting means, using an atomized fuel behavioral model representing behavior of fuel injected from the fuel injection valve, an intake passage fuel behavioral model representing fuel behavior in the intake passage and a combustion chamber fuel behavioral model representing fuel behavior in the combustion chamber; injection amount calculating means for calculating a fuel injection amount required to adjust an actual gaseous air-fuel ratio in the combustion chamber to a desired value in accordance with the fuel quantity-of-state calculated by the fuel quantity-of-state calculating means; and injection valve actuating means for opening and closing the fuel injection valve on the basis of the fuel injection amount calculated by the injection amount calculating means.
Claim 3
Dependent Claim
77 words
The fuel injection control apparatus in accordance with claim 1, wherein the combustion chamber fuel behavioral model includes a cranking model representing fuel behavior during a first period from start-up of engine to an initial explosion and a firing model representing fuel behavior during a second period succeeding the first period, said cranking model being selected in the beginning of the engine starting operation, and being switched to the firing model upon detection of the initial explosion.
Claim 4
Dependent Claim
45 words
The fuel injection control apparatus in accordance with claim 2, wherein, if leakage of fuel from the fuel injection valve is detected during a dormant period of the engine, such a leakage amount is reflected to determination of an initial value of the cranking model.
Claim 5
Dependent Claim
47 words
The fuel injection control apparatus in accordance with claim 1, wherein the combustion chamber fuel behavioral model takes account of a combustion chamber inflow fuel amount including a fuel amount adhering on a wall of the combustion chamber and a fuel amount vaporized in the combustion chamber.
Claim 6
Dependent Claim
82 words
The fuel injection control apparatus in accordance with claim 1, wherein the combustion chamber fuel behavioral model divides a combustion chamber inflow fuel amount F o into three, a fuel amount α d ·F o adhering on a wall of a cylinder of the combustion chamber, a fuel amount α c ·F o adhering on other wall of the combustion chamber and a fuel amount β c ·F o vaporized in the combustion chamber, where α d +α c +β c =1.
Claim 7
Dependent Claim
55 words
The fuel injection control apparatus in accordance with claim 1, wherein the combustion chamber fuel behavioral model takes account of a combustion chamber adhesion fuel amount M c including a fuel amount γ c ·M c vaporized in the combustion chamber and a fuel amount γ e ·M c carried over to the exhaust passage.
Claim 8
Dependent Claim
36 words
The fuel injection control apparatus in accordance with claim 1, wherein the combustion chamber fuel behavioral model takes account of a gaseous fuel amount residing in the combustion chamber without being burnt in a cranking operation.
Claim 9
Dependent Claim
171 words
A fuel injection control apparatus for an internal combustion engine comprising: a fuel injection valve disposed in a combustion chamber so that fuel is directly injected from the fuel injection valve into the combustion chamber; operational condition detecting means for detecting various operational conditions including properties of fuel; fuel quantity-of-state calculating means for calculating a fuel quantity-of-state in the combustion chamber in accordance with the operational conditions detected by the operational condition detecting means, using an atomized fuel behavioral model representing behavior of fuel injected from the fuel injection valve and a combustion chamber fuel behavioral model representing fuel behavior in the combustion chamber; injection amount calculating means for calculating a fuel injection amount required to adjust an actual gaseous air-fuel ratio in the combustion chamber to a desired value in accordance with the fuel quantity-of-state calculated by the fuel quantity-of-state calculating means; and injection valve actuating means for opening and closing the fuel injection valve on the basis of the fuel injection amount calculated by the injection amount calculating means.
Claim 10
Dependent Claim
171 words
A fuel injection control apparatus for an internal combustion engine comprising: a fuel injection valve disposed in a combustion chamber so that fuel is directly injected from the fuel injection valve into the combustion chamber; operational condition detecting means for detecting various operational conditions including properties of fuel; fuel quantity-of-state calculating means for calculating a fuel quantity-of-state in the combustion chamber in accordance with the operational conditions detected by the operational condition detecting means, using an atomized fuel behavioral model representing behavior of fuel injected from the fuel injection valve and a combustion chamber fuel behavioral model representing fuel behavior in the combustion chamber; injection amount calculating means for calculating a fuel injection amount required to adjust an actual gaseous air-fuel ratio in the combustion chamber to a desired value in accordance with the fuel quantity-of-state calculated by the fuel quantity-of-state calculating means; and injection valve actuating means for opening and closing the fuel injection valve on the basis of the fuel injection amount calculated by the injection amount calculating means.
Claim 11
Dependent Claim
77 words
The fuel injection control apparatus in accordance with claim 8, wherein the combustion chamber fuel behavioral model includes a cranking model representing fuel behavior during a first period from start-up of engine to an initial explosion and a firing model representing fuel behavior during a second period succeeding the first period, said cranking model being selected in the beginning of the engine starting operation, and being switched to the firing model upon detection of the initial explosion.
Claim 12
Dependent Claim
45 words
The fuel injection control apparatus in accordance with claim 9, wherein, if leakage of fuel from the fuel injection valve is detected during a dormant period of the engine, such a leakage amount is reflected to determination of an initial value of the cranking model.
Claim 13
Dependent Claim
47 words
The fuel injection control apparatus in accordance with claim 8, wherein the combustion chamber fuel behavioral model takes account of a combustion chamber inflow fuel amount including a fuel amount adhering on a wall of the combustion chamber and a fuel amount vaporized in the combustion chamber.
Claim 14
Dependent Claim
82 words
The fuel injection control apparatus in accordance with claim 8, wherein the combustion chamber fuel behavioral model divides a combustion chamber inflow fuel amount F o into three, a fuel amount α d ·F o adhering on a wall of a cylinder of the combustion chamber, a fuel amount α c ·F o adhering on other wall of the combustion chamber and a fuel amount β c ·F o vaporized in the combustion chamber, where α d +α c +β c =1.
Claim 15
Dependent Claim
56 words
The fuel injection control apparatus in accordance with claim 8, wherein the combustion chamber fuel behavioral model further takes account of a combustion chamber adhesion fuel amount M c including a fuel amount γ c ·M c vaporized in the combustion chamber and a fuel amount γ c ·M c carried over to the exhaust passage.
Claim 16
Dependent Claim
36 words
The fuel injection control apparatus in accordance with claim 8, wherein the combustion chamber fuel behavioral model takes account of a gaseous fuel amount residing in the combustion chamber without being burnt in a cranking operation.
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) | 1999-02-19 | 1999-08-21 | 2000-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-02-19 | 2003-08-21 | 2004-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-02-19 | 2007-08-21 | 2008-02-20 | $7700.00 | Window Closed / Lapsed |