US5134981A
Expired / Lapsed
US
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Fuel injection control method in an engine
Assignee: Hitachi Ltd
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Filing: 1990-08-31
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Granted: 1992-08-04
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Expires: 2010-08-31
Abstract
Abstract In order to make the quantity of fuel in a cylinder approach a requested value with high accuracy, the characteristic of fuel transport is employed by use of a model in which all injected fuel adheres onto walls of the intake manifold and then a part of the fuel adhering to the walls is sucked off into the cylinder. By use of a respective model for each cylinder, the quantity of fuel injected into each cylinder is independently controlled so that the quantity of fuel in the cylinder is established to be a requested value.
Inventors
- 👤 Shinsuke Takahashi
- 👤 Teruji Sekozawa
- 👤 Makoto Shioya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:04
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/008; F02D41/30; F02D41/02; F02D41/04; F02D41/047
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
85 words
An engine fuel injection control method for controlling fuel injection based on the quantity of suction air, said method comprising the step of determining the quantity of fuel injection G f in the current cycle by an equation of ##EQU11## in which Q a represents the mass of suction air, M f represents the quantity of stagnant fuel in an intake manifold, α represents the rate of sucking off stagnant fuel into a cylinder in an air-intake stroke, and A/F represents a target air-fuel ratio.
Claim 2
Dependent Claim
85 words
An engine fuel injection control method for controlling fuel injection based on the quantity of suction air, said method comprising the step of determining the quantity of fuel injection G f in the current cycle by an equation of ##EQU11## in which Q a represents the mass of suction air, M f represents the quantity of stagnant fuel in an intake manifold, α represents the rate of sucking off stagnant fuel into a cylinder in an air-intake stroke, and A/F represents a target air-fuel ratio.
Claim 3
Dependent Claim
58 words
An engine fuel injection control method according to claim 1, in which the step of determining includes the step of calculating the quantity of stagnant fuel M f ' used for calculation of the quantity of fuel injection in the next cycle, by the following equation using M f , α and G f : M.sub.f '=(1-α)·(M.sub.f +G.sub.f).
Claim 4
Independent Claim
117 words
A method of controlling fuel injection amount of a multi-point fuel injection system in an multi-cylinder engine, comprising the steps of: providing a fuel transportation model for each cylinder of the engine, each fuel transportation model defining a fuel transportation condition in an inlet manifold for the respective cylinder; estimating a transported fuel amount into a cylinder via the inlet manifold on the basis of the fuel transportation model for that cylinder using the latest fuel injection amount determined in a former intake stroke of the same cylinder without using a fuel injection amount of any other cylinder; and calculating a fuel injection amount at a present time in said cylinder according to the estimated fuel amount.
Claim 5
Independent Claim
117 words
A method of controlling fuel injection amount of a multi-point fuel injection system in an multi-cylinder engine, comprising the steps of: providing a fuel transportation model for each cylinder of the engine, each fuel transportation model defining a fuel transportation condition in an inlet manifold for the respective cylinder; estimating a transported fuel amount into a cylinder via the inlet manifold on the basis of the fuel transportation model for that cylinder using the latest fuel injection amount determined in a former intake stroke of the same cylinder without using a fuel injection amount of any other cylinder; and calculating a fuel injection amount at a present time in said cylinder according to the estimated fuel amount.
Claim 6
Dependent Claim
24 words
A method according to claim 3, wherein said estimated fuel amount includes an amount of stagnant fuel which temporarily remains in the inlet manifold.
Claim 7
Dependent Claim
23 words
A method according to claim 4, wherein different fuel transportation models are provided for at least two of the cylinders of the engine.
Claim 8
Dependent Claim
28 words
A method according to claim 5, wherein said different fuel transportation models have the same model structure and have different parameter values in the same engine operating condition.
Claim 9
Dependent Claim
82 words
A method according to claim 4, wherein said fuel transportation model simulates the fuel transport in the intake manifold such that the whole amount (G f ) of the injected fuel before an intake stroke is stuck on an inner wall of the intake manifold, and the stagnant fuel amount (M f ) is increased by the whole amount (G f ) and a part of said stagnant fuel amount is transported into the cylinder at the intake stroke after fuel injection.
Claim 10
Dependent Claim
25 words
A method according to claim 3, wherein said latest fuel injection amount is the actual injection amount in the former cycle of the same cylinder.
Claim 11
Dependent Claim
23 words
A method according to claim 8, wherein different fuel transportation models are provided for at least two of the cylinders of the engine.
Claim 12
Dependent Claim
28 words
A method according to claim 9, wherein said different fuel transportation models have the same model structure and have different parameter values in the same engine operating condition.
Claim 13
Dependent Claim
21 words
A method according to claim 8, wherein said calculating of a fuel injection amount is made periodically with a predetermined period.
Claim 14
Dependent Claim
42 words
A method according to claim 11, further comprising a step of judging a cylinder in which fuel is to be injected next, said calculation of a fuel injection amount being made for the next cylinder to which fuel is to be injected.
Claim 15
Independent Claim
122 words
A method of controlling fuel injection amount of a multi-point fuel injection system in an multi-cylinder engine, comprising the steps of: providing a fuel transportation model for each cylinder of the engine, each fuel transportation model defining a fuel transportation condition in an inlet manifold for the respective cylinder; estimating a stagnant fuel amount (Mf) in an upper stream of a cylinder on the basis of the fuel transportation model for that cylinder using the latest fuel injection amount determined in the former intake stroke of the same cylinder within using a fuel injection amount of any other cylinder; and calculating a fuel injection amount at a present time in said cylinder according to the estimated stagnant fuel amount (M f ).
Claim 16
Independent Claim
122 words
A method of controlling fuel injection amount of a multi-point fuel injection system in an multi-cylinder engine, comprising the steps of: providing a fuel transportation model for each cylinder of the engine, each fuel transportation model defining a fuel transportation condition in an inlet manifold for the respective cylinder; estimating a stagnant fuel amount (Mf) in an upper stream of a cylinder on the basis of the fuel transportation model for that cylinder using the latest fuel injection amount determined in the former intake stroke of the same cylinder within using a fuel injection amount of any other cylinder; and calculating a fuel injection amount at a present time in said cylinder according to the estimated stagnant fuel amount (M f ).
Claim 17
Dependent Claim
23 words
A method according to claim 13, wherein different fuel transportation models are provided for at least two of the cylinders of the engine.
Claim 18
Dependent Claim
29 words
A method according to claim 14, wherein said two different fuel transportation models have the same model structure and have different parameter values in the same engine operating condition.
Claim 19
Dependent Claim
82 words
A method according to claim 13, wherein said fuel transportation model simulates the fuel transport in the intake manifold such that the whole amount (G f ) of the injected fuel before an intake stroke is stuck on an inner wall of the intake manifold, and the stagnant fuel amount (M f ) is increased by the whole amount (G f ) and a part of said stagnant fuel amount is transported into the cylinder at the intake stroke after fuel injection.
Claim 20
Independent Claim
77 words
A method of controlling fuel injection amount of a multi-point fuel injection system in an multi-cylinder engine, comprising the steps of: determining a ratio between intake air flow and a fuel amount transported into a cylinder from the total of stagnant fuel in an inlet manifold of the cylinder before an intake stroke; and calculating a fuel injection amount at a present time in said cylinder in such a manner that said ratio becomes a predetermined value.
Claim 21
Independent Claim
77 words
A method of controlling fuel injection amount of a multi-point fuel injection system in an multi-cylinder engine, comprising the steps of: determining a ratio between intake air flow and a fuel amount transported into a cylinder from the total of stagnant fuel in an inlet manifold of the cylinder before an intake stroke; and calculating a fuel injection amount at a present time in said cylinder in such a manner that said ratio becomes a predetermined value.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1995-08-04 | 1996-02-03 | 1996-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-04 | 2000-02-03 | 2000-08-04 | $3760.00 | Window Closed / Lapsed |
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