Claims
- 1. A control method for an engine comprising the steps of:
- (a) determining combustion state parameters indicating a combustion state in each cylinder of said engine based on fluctuation of rotational speed for an explosion cycle of the respective cylinders;
- (b) determining an average combustion state parameter from said combustion state parameters determined for each of the cylinders in order to get information on the overall combustion state;
- (c) judging a combustion state in each of the cylinders by comparing said average combustion state parameter with the combustion state parameter determined for each of the cylinders; and
- (d) controlling the combustion state in each of the cylinders based on results of the judgment.
- 2. A control method for an engine comprising the steps of:
- (a) determining combustion state parameters indicating a combustion state in each cylinder of said engine based on fluctuation of rotational speed for an explosion cycle of the respective cylinders;
- (b) determining an average combustion state parameter from said combustion state parameters determined for each of the cylinders in order to get information on the overall combustion state;
- (c) judging a combustion state in a particular cylinder is not in a desired state when at least one of the following is true: first a difference between said combustion state parameter of said particular cylinder and said average combustion state parameter exceed a first given value, and second, a difference between said combustion state parameter of said particular cylinder and said average combustion state parameter exceeds a second given value; and
- (d) controlling combustion states in each cylinder based on results of the judgment for that cylinder.
- 3. A control method for an engine comprising the steps of:
- (a) determining combustion state parameters indicating a combustion state in each cylinder of said engine;
- (b) determining an average combustion state parameter from the combustion state parameters determined for each of the cylinders in order to get information on the overall combustion state;
- (c) judging a combustion state in each of the cylinders by comparing said average combustion state parameter with the combustion state parameter determined for each of the cylinders;
- (d) controlling the combustion state in each cylinder based on results of the judgment; and
- (e) judging a combustion state for all of the cylinders by comparing said average combustion state parameter with a preset judging value; and
- (f) controlling the combustion state in all of the cylinders based on results of said judgment for all of the cylinders.
- 4. A control method for an engine comprising the steps of:
- (a) determining combustion state parameters indicating a combustion state in each cylinder of said engine;
- (b) determining an average combustion state parameter from the combustion state parameters determined for each of the cylinders in order to get information on the overall combustion state;
- (c) determining a combustion state in each of the cylinders by comparing said average combustion state parameter with the combustion state parameter determined for each of the cylinders;
- (d) controlling the combustion state in each of the cylinders based on results of the judgment; and
- (e) judging whether the overall combustion state in all of the cylinders is within a given combustion state region by comparing said average combustion state parameter with a preset first judging value and a preset second judging value; and
- (f) controlling overall combustion state of all of the cylinders based on the result of said judgement such as to enter into the given combustion state region.
- 5. An engine controller comprising:
- (a) means for determining a combustion state parameter indicating a combustion state in each cylinders of an engine;
- (b) means for determining an average combustion state parameter from the combustion state parameters determined for each of the cylinders in order to get information on the overall combustion state;
- (c) means for judging a combustion state in a particular cylinder by comparing said average combustion state parameter with the combustion state parameter determined for said particular cylinder;
- (d) means for controlling combustion states in each of the cylinders based on results of the combination state judge for that cylinder;
- (e) means for judging an overall combustion state of all of the cylinders by comparing said average combustion state parameter with a preset judging value; and
- (f) means for controlling the overall combustion state of all of the cylinders based on the result of said judgment of an overall combustion state.
- 6. An engine controller comprising:
- (a) means for determining a combustion state parameter indicating a combustion state in each cylinder of an engine;
- (b) means for determining an average combustion state parameter from the combustion state parameters determined for each of the cylinders in order to get information on the overall combustion state;
- (c) means for judging a combustion state in each of the cylinders by comparing said average combustion state parameter with the combustion state parameter determined for each of the cylinders; and
- (d) means for controlling the combustion state in each of the cylinders based on results of the judgment;
- wherein the combustion state parameter for each of the cylinders is determined based on fluctuation of the engine rotational speed for an explosion cycle of the respective cylinders.
- 7. An engine controller wherein a combustion state of an engine is quantitatively detected to perform a fuel correction for improving the combustion by comparing said detected value with a pre-stored base value, which controller comprises:
- (a) means for determining a parameter indicating the combustion state of the engine;
- (b) base value storing means for storing and updating a value of a combustion state parameter determined at any time when the engine is in a base combustion state, for use as a base value; and
- (c) means for judging degradation of combustion state by comparing said base value stored in the base value storing means with a parameter indicating a combustion state of each cylinder of the engine determined when an operating condition of the engine is in a state to judge a combustion state.
- 8. A control method for an engine, comprising the steps of:
- (a) determining combustion state parameters indicating a combustion state in each cylinder of an engine;
- (b) determining and storing a value of respective combustion state parameters determined for each of the cylinders of the engine at any time when an operating condition of the engine is in a base combustion state, as a learned value;
- (c) correcting a combustion state parameter indicating a combustion state in each of the cylinders by means of said learned value;
- (d) determining an average combustion state parameter from corrected combustion state parameters determined for each of the cylinders in order to get information on the total combustion state;
- (e) judging a combustion state in each of the cylinders by comparing said average combustion state parameter with the combustion state parameter determined for each of the cylinders; and
- (f) controlling the combustion state in each of the cylinders based on results of said judgment.
- 9. A control method for an engine, comprising the steps of:
- (a) determining combustion state parameters indicating a combustion state in each cylinder of said engine;
- (b) storing a value of a combustion state parameter determined for each of the cylinders, under a base combustion state, as a learned value;
- (c) correcting a combustion state parameter indicating a combustion state in each of the cylinders by means of said learned value;
- (d) determining an average combustion state parameter from the corrected combustion state parameters determined for each of the cylinders in order to get information on the total combustion state;
- (e) judging a combustion state in each of the cylinders by comparing said average combustion state parameter with the combustion state parameter determined for each of the cylinders;
- (f) controlling the combustion state in each of the cylinders based on the results of said judgment of a combustion state in each cylinder;
- (g) judging an overall combustion state in all of the cylinders by comparing said average combustion state parameter with a preset judging value; and
- (h) controlling the overall combustion state of all of the cylinders based on the result of said judgment of said overall combustion state.
- 10. A control method for an engine wherein a combustion state of an engine is quantitatively detected to perform a fuel correction, to improve combustion of said engine by comparing detected combustion state with a pre-stored base value, which method comprises the steps of:
- (a) determining a value of a parameter under a combustion state where an operating condition of said engine is brought into a base combustion state, for use as a new value of a combustion state parameter and updating said pre-stored base value with said new value of the combustion state parameter; and
- (b) judging degradation of combustion state by comparing said base value with a parameter indicating a combustion state of each cylinder of the engine determined when said engine is in an operating condition for determining a combustion state.
- 11. A control method for an engine according to claim 10, wherein:
- a plurality of said base values are provided corresponding to operating state of the engine.
- 12. A control method for an engine according to claim 10, wherein:
- said base value is determined at a fuel cut-off state.
- 13. A control method for an engine according to claim 10, wherein:
- said base value is determined at a non-load operating state.
Priority Claims (2)
Number |
Date |
Country |
Kind |
5-100711 |
Apr 1993 |
JPX |
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5-195823 |
Aug 1993 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/234,156, filed Apr. 28, 1994, abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (3)
Number |
Date |
Country |
58-217732 |
Dec 1983 |
JPX |
59-122763 |
Jul 1984 |
JPX |
283835 |
Nov 1990 |
JPX |
Continuations (1)
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Number |
Date |
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Parent |
234156 |
Apr 1994 |
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