Exhaust gas heating system for in-cylinder injection internal combustion engine
First Claim
1. An exhaust gas heating system for an in-cylinder injection internal combustion engine, comprising:
- a fuel injection device for injecting fuel directly into a combustion chamber of the internal combustion engine;
a spark plug for subjecting fuel, which has been injected as primary fuel from said fuel injection device, to spark ignition so that said primary fuel undergoes primary combustion;
an exhaust gas purification device arranged in an exhaust passage of the internal combustion engine;
a purification device temperature computing unit for detecting a temperature of said exhaust gas purification device by detecting or estimating said temperature of said exhaust gas purification device; and
an additional fuel injection control unit for controlling said fuel injection device to inject additional fuel when said detected temperature of said exhaust gas purification device is equal to or lower than a predetermined value, such that the additional fuel is injected during a flame lasting duration that a flame of said primary combustion based on said injection of said primary fuel remains,wherein said additional fuel injection control unit includes an injection timing setting unit for setting an injection start time of said additional fuel on a basis of a parameter which affects said flame lasting duration.
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Accused Products
Abstract
An exhaust gas heating system for an in-cylinder injection internal combustion engine is disclosed. The system includes a fuel injection device for injecting fuel directly into a combustion chamber of the engine, a spark plug for subjecting fuel, which has been injected as primary fuel from the injection device, to spark ignition such that the primary fuel undergoes primary combustion, an exhaust gas purification device arranged in an exhaust passage of the engine, a purification device temperature computing unit for determining a temperature of the purification device by detecting or estimating the temperature of the purification device, and an additional fuel injection control unit for controlling the injection device when the purification device is found to require activation from the temperature determined by the computing unit, such that an injection of fuel as additional fuel is performed during a flame lasting duration that a flame of the primary combustion remains. The control unit includes an injection timing setting unit for setting an injection start time of the additional fuel on a basis of a parameter which affects the flame lasting duration.
96 Citations
29 Claims
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1. An exhaust gas heating system for an in-cylinder injection internal combustion engine, comprising:
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a fuel injection device for injecting fuel directly into a combustion chamber of the internal combustion engine; a spark plug for subjecting fuel, which has been injected as primary fuel from said fuel injection device, to spark ignition so that said primary fuel undergoes primary combustion; an exhaust gas purification device arranged in an exhaust passage of the internal combustion engine; a purification device temperature computing unit for detecting a temperature of said exhaust gas purification device by detecting or estimating said temperature of said exhaust gas purification device; and an additional fuel injection control unit for controlling said fuel injection device to inject additional fuel when said detected temperature of said exhaust gas purification device is equal to or lower than a predetermined value, such that the additional fuel is injected during a flame lasting duration that a flame of said primary combustion based on said injection of said primary fuel remains, wherein said additional fuel injection control unit includes an injection timing setting unit for setting an injection start time of said additional fuel on a basis of a parameter which affects said flame lasting duration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. An exhaust gas heating system for an in-cylinder injection internal combustion engine, comprising:
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a fuel injection device for injecting fuel directly into a combustion chamber of the internal combustion engine; a spark plug for subjecting fuel, which has been injected as primary fuel from said fuel injection device, to spark ignition so that said primary fuel undergoes primary combustion; an exhaust gas purification device arranged in an exhaust passage of said internal combustion engine; and an additional fuel injection control unit for controlling said fuel injection device so that, when said exhaust gas purification device is found to require activation of a catalyst thereof, fuel is injected as additional fuel within a flame lasting duration in which a flame of said primary combustion remains, wherein said additional fuel injection control unit includes, an injection quantity computing unit for determining an injection quantity of said additional fuel on a basis of at least one of a directly and indirectly-detected quantity of oxygen still remaining after said primary combustion, and an injection timing setting unit including an injecting duration setting unit for setting a basic injecting duration corresponding to said injection quantity of said additional fuel determined by said injection quantity computing unit, and an injection start time setting unit for setting an injection start time of said additional fuel on a basis of a parameter which affects said flame lasting duration, and said injection start time setting unit, upon starting up said internal combustion engine at a low temperature, sets said injection start time such that said injection of said additional fuel is effected within said flame lasting duration and, in an operation state from which said exhaust gas purification device is expected to be reduced in temperature, sets said injection start time such that said injection of said additional fuel is effected after said flame lasting duration.
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24. A catalyst heating system for an in-cylinder injection internal combustion engine, comprising:
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a fuel injection unit for injecting fuel directly into a combustion chamber; a spark ignition unit for igniting a primary fuel injected by the fuel injection unit; a temperature sensor for detecting a temperature of the catalyst; a comparing unit for comparing the detected temperature with a predetermined value; and an additional fuel injection control unit for injecting additional fuel from said fuel injection unit during a flame lasting duration period of the ignited primary fuel when the detected temperature is equal to or lower than the predetermined value to increase the temperature of the catalyst.
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25. A method of heating exhaust gas in an in-cylinder injection internal combustion engine, comprising:
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injecting a primary fuel directly into a combustion chamber; igniting the primary fuel by a spark plug; detecting a temperature of an exhaust gas purification device arranged in an exhaust passage of the engine; comparing the detected temperature of an exhaust gas purification device with a predetermined value; executing a secondary fuel injection control to increase the temperature of the exhaust gas when the detected temperature is equal to or lower than the predetermined value, and injecting the secondary fuel during a flame lasting duration period of the ignited primary fuel, such that the secondary fuel is ignited by the lasting flame of the primary fuel. - View Dependent Claims (26)
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27. An exhaust gas heating system for an in-cylinder injection internal combustion engine, comprising:
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a fuel injection device for injecting fuel directly into a combustion chamber of the internal combustion engine; a spark plug for subjecting fuel, which has been injected as primary fuel from said fuel injection device, to spark ignition so that said primary fuel undergoes primary combustion; an exhaust gas purification device arranged in an exhaust passage of the internal combustion engine; a purification device temperature computing unit for detecting a temperature of said exhaust gas purification device by detecting or estimating said temperature of said exhaust gas purification device; and an additional fuel injection control unit for controlling said fuel injection device when said exhaust gas purification device is found to require activation from said temperature determined by said purification device temperature computing unit, such that an additional fuel is injected during a flame lasting duration that a flame of said primary combustion based on said injection of said primary fuel remains, wherein said additional fuel injection control unit includes an injection timing setting unit for setting an injection start time of said additional fuel on a basis of a parameter which affects said flame lasting duration, and wherein said injection timing setting unit includes an injection quantity computing unit for determining said injection quantity of said additional fuel on a basis of at least one of a directly and indirectly-detected quantity of oxygen still remaining after said primary combustion, an injection duration setting unit for setting an injecting duration, which corresponds to said injection quantity of said additional fuel determined by said injection quantity computing unit, and an injection start time setting unit for setting an injection start time of said additional fuel on the basis of said parameter which affects said flame lasting duration.
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28. An exhaust gas heating system for an in-cylinder injection internal combustion engine, comprising:
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a fuel injection device for injecting fuel directly into a combustion chamber of the internal combustion engine; a spark plug for subjecting fuel, which has been injected as primary fuel from said fuel injection device, to spark ignition so that said primary fuel undergoes primary combustion; an exhaust gas purification device arranged in an exhaust passage of the internal combustion engine; a purification device temperature computing unit for detecting a temperature of said exhaust gas purification device by detecting or estimating said temperature of said exhaust gas purification device; and an additional fuel injection control unit for controlling said fuel injection device when said exhaust gas purification device is found to require activation from said temperature determined by said purification device temperature computing unit, such that an additional fuel is injected during a flame lasting duration that a flame of said primary combustion based on said injection of said primary fuel remains, wherein said additional fuel injection control unit includes an injection timing setting unit for setting an injection start time of said additional fuel on a basis of a parameter which affects said flame lasting duration, and wherein said additional fuel injection control unit includes an injection quantity computing unit for determining said injection quantity of said additional fuel on a basis of at least one of a directly and indirectly-detected quantity of oxygen still remaining after said primary combustion, and said injection timing setting unit is provided with a divided injection start time setting unit which sets injection start times of plural divided injections so that said injection quantity of said additional fuel determined by said injection quantity computing unit is divided and injected in like plural portions.
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29. An exhaust gas heating system for an in-cylinder injection internal combustion engine, comprising:
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a fuel injection device for injecting fuel directly into a combustion chamber of the internal combustion engine; a spark plug for subjecting fuel, which has been injected as primary fuel from said fuel injection device, to spark ignition so that said primary fuel undergoes primary combustion; an exhaust gas purification device arranged in an exhaust passage of the internal combustion engine; a purification device temperature computing unit for detecting a temperature of said exhaust gas purification device by detecting or estimating said temperature of said exhaust gas purification device; and an additional fuel injection control unit for controlling said fuel injection device when said exhaust gas purification device is found to require activation from said temperature determined by said purification device temperature computing unit, such that an additional fuel is injected during a flame lasting duration that a flame of said primary combustion based on said injection of said primary fuel remains, wherein said additional fuel injection control unit includes an injection timing setting unit for setting an injection start time of said additional fuel on a basis of a parameter which affects said flame lasting duration, and said injection timing setting unit sets the injection start timing of said additional fuel on a basis of at least one of a temperature of said internal combustion engine, an exhaust gas recirculation rate, an air/fuel ratio, and an ignition timing, as said parameter.
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Specification