Emission deterioration notifying device
First Claim
1. An emission deterioration notifying device adapted for a spark-ignition internal combustion engine including a combustion chamber and for a fuel injection system including an injector, the engine being a direct-injection internal combustion engine that injects fuel from the injector directly into the combustion chamber, the emission deterioration notifying device comprising:
- a low fuel pressure determining unit configured to determine whether supply pressure of fuel supplied to the injector is in a low fuel pressure state, in which the supply pressure is higher than a fuel pressure at which fuel injection is allowed and is lower than a predetermined threshold value, wherein the predetermined threshold value is a threshold value for emission (EM);
an emission deterioration notifying unit configured to notify that exhaust emission is deteriorating beyond its allowable range when it is determined that the supply pressure is in the low fuel pressure state; and
an electric control unit that is configured to allow the notification by the emission deterioration notifying unit at a time of injection control at which the injection of fuel from the injector is allowed, and that is configured to prohibit the notification by the emission deterioration notifying unit or to reduce the threshold value at a time of injection stop control at which the injection of fuel from the injector is stopped.
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Accused Products
Abstract
An emission deterioration notifying device includes a low fuel pressure determining unit, an emission deterioration notifying unit, and an electric control unit. The determining unit determines whether supply pressure of fuel supplied to an injector is in a low fuel pressure state, in which the supply pressure is lower than a predetermined threshold value. The notifying unit notifies that exhaust emission is deteriorating beyond its allowable range when it is determined that the supply pressure is in the low fuel pressure state. The control unit allows notification by the notifying unit at a time of injection control at which injection of fuel from the injector is allowed, and the control unit prohibits notification by the notifying unit or reduces the threshold value at a time of injection stop control at which injection of fuel from the injector is stopped.
15 Citations
10 Claims
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1. An emission deterioration notifying device adapted for a spark-ignition internal combustion engine including a combustion chamber and for a fuel injection system including an injector, the engine being a direct-injection internal combustion engine that injects fuel from the injector directly into the combustion chamber, the emission deterioration notifying device comprising:
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a low fuel pressure determining unit configured to determine whether supply pressure of fuel supplied to the injector is in a low fuel pressure state, in which the supply pressure is higher than a fuel pressure at which fuel injection is allowed and is lower than a predetermined threshold value, wherein the predetermined threshold value is a threshold value for emission (EM); an emission deterioration notifying unit configured to notify that exhaust emission is deteriorating beyond its allowable range when it is determined that the supply pressure is in the low fuel pressure state; and an electric control unit that is configured to allow the notification by the emission deterioration notifying unit at a time of injection control at which the injection of fuel from the injector is allowed, and that is configured to prohibit the notification by the emission deterioration notifying unit or to reduce the threshold value at a time of injection stop control at which the injection of fuel from the injector is stopped. - View Dependent Claims (2, 3)
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4. An emission deterioration notifying device adapted for a spark-ignition internal combustion engine including a combustion chamber and a catalyst device that purifies exhaust gas and for a fuel injection system including an injector, the engine being a direct-injection internal combustion engine that injects fuel from the injector directly into the combustion chamber, the emission deterioration notifying device comprising:
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a low fuel pressure determining unit configured to determine whether supply pressure of fuel supplied to the injector is in a low fuel pressure state, in which the supply pressure is higher than a fuel pressure at which fuel injection is allowed and is lower than a predetermined threshold value, wherein the predetermined threshold value is a threshold value for emission (EM); an emission deterioration notifying unit configured to notify that exhaust emission is deteriorating beyond its allowable range when it is determined that the supply pressure is in the low fuel pressure state; and an electric control unit that is configured to allow the notification by the emission deterioration notifying unit at a time of deactivation at which the catalyst device has not reached a catalytic activation temperature, and that is configured to prohibit the notification by the emission deterioration notifying unit or to reduce the threshold value at a time of activation at which the catalyst device has the catalytic activation temperature or higher. - View Dependent Claims (5, 6)
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7. An emission deterioration notifying device adapted for a spark-ignition internal combustion engine including a combustion chamber and for a fuel injection system including an injector, the engine being a direct-injection internal combustion engine that injects fuel from the injector directly into the combustion chamber, the emission deterioration notifying device comprising:
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a low fuel pressure determining unit configured to determine whether supply pressure of fuel supplied to the injector is in a low fuel pressure state, in which the supply pressure is higher than a fuel pressure at which fuel injection is allowed and is lower than a predetermined threshold value, wherein the predetermined threshold value is a threshold value for emission (EM); an emission deterioration notifying unit configured to notify that exhaust emission is deteriorating beyond its allowable range when it is determined that the supply pressure is in the low fuel pressure state; and an electric control unit that is configured to allow the notification by the emission deterioration notifying unit when the engine is in a low temperature state in which temperature of the engine has not reached a predetermined temperature, and that is configured to prohibit the notification by the emission deterioration notifying unit or to reduce the threshold value when the engine is in a high temperature state in which the temperature of the engine is equal to or higher than the predetermined temperature. - View Dependent Claims (8, 9)
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10. An emission deterioration notifying device adapted for a spark-ignition internal combustion engine including a combustion chamber and for a fuel injection system including an injector, the engine being a direct-injection internal combustion engine that injects fuel from the injector directly into the combustion chamber, the emission deterioration notifying device comprising:
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an injection prohibition control unit configured to prohibit the injection of fuel from the injector in a period after starting of the engine is begun until supply pressure of fuel supplied to the injector rises to reach a predetermined threshold value, wherein the predetermined threshold value is a threshold value at and above which fuel injection is allowed; a confirmation unit configured to confirm whether fuel is erroneously injected in the period during which the injection of fuel is prohibited by the injection prohibition control unit; and an emission deterioration notifying unit configured to notify that exhaust emission is deteriorating beyond its allowable range when it is confirmed by the confirmation unit that fuel is erroneously injected; wherein the fuel injection system further includes; an injection command unit configured to output an injection command signal that is set in accordance with an operating state of the engine; and a drive circuit that is configured to control drive electric power supplied to the injector based on the injection command signal; and the confirmation unit is configured to confirm whether fuel is erroneously injected based on the drive electric power supplied to the injector as controlled by the drive circuit.
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Specification