Fuel supply apparatus for engine and control method of same apparatus
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-069/46
F02M-069/50
출원번호
US-0790795
(2007-04-27)
등록번호
US-7412968
(2008-08-19)
우선권정보
JP-2006-124798(2006-04-28)
발명자
/ 주소
Takayanagi,Keiichi
Furuya,Junichi
출원인 / 주소
Hitachi, Ltd.
대리인 / 주소
Foley & Lardner LLP
인용정보
피인용 횟수 :
7인용 특허 :
6
초록▼
In a fuel supply apparatus for an engine, which is provided with a relief valve for returning fuel in a fuel pipe into a fuel tank when a fuel pressure exceeds a threshold, and also feedback controls a discharge amount of a fuel pump so that the fuel pressure detected by a pressure sensor approaches
In a fuel supply apparatus for an engine, which is provided with a relief valve for returning fuel in a fuel pipe into a fuel tank when a fuel pressure exceeds a threshold, and also feedback controls a discharge amount of a fuel pump so that the fuel pressure detected by a pressure sensor approaches a target pressure, when the pressure sensor is failed, a duty of a PWM signal for the fuel pump is fixedly maintained at a predetermined value, and fuel injection pulse width is calculated on the assumption that the fuel pressure is held at the threshold.
대표청구항▼
We claim: 1. A fuel supply apparatus for an engine, comprising: a fuel injection valve capable of injecting fuel to the engine; a fuel tank capable of storing the fuel for the engine; a fuel pump capable of supplying the fuel in the fuel tank to the fuel injection valve via a fuel pipe; a mechanica
We claim: 1. A fuel supply apparatus for an engine, comprising: a fuel injection valve capable of injecting fuel to the engine; a fuel tank capable of storing the fuel for the engine; a fuel pump capable of supplying the fuel in the fuel tank to the fuel injection valve via a fuel pipe; a mechanical relief valve capable of returning the fuel in the fuel pipe into the fuel tank when a pressure in the fuel pipe exceeds a threshold; a pressure sensor capable of detecting a pressure of the fuel in the fuel pipe; and a control unit configured to input thereto a signal detected from the pressure sensor to output therefrom a manipulated variable for the fuel pump, wherein the control unit is configured to determines whether the pressure sensor is in a normal operation state or in an abnormal operation state; wherein when the pressure sensor is determined to be in the normal operation state, the control unit calculates the manipulated variable so that the fuel pressure detected by the pressure sensor approaches a target pressure; and wherein when the pressure sensor is determined to be in the abnormal operation state, the control unit is configured to fixedly maintain the manipulated variable at a manipulated variable at which a discharge amount of the fuel pump reaches a maximum amount, to thereby hold the fuel pressure in the fuel pipe in the vicinity of a valve-opening pressure of the relief valve. 2. The apparatus according to claim 1, wherein the control unit: is configured to fixedly maintain the manipulated variable at the manipulated variable at which a discharge amount of the fuel pump reaches the maximum amount, to thereby hold the fuel pressure in the fuel pipe in the vicinity of the valve-opening pressure of the relief valve, when the pressure sensor is in the abnormal operation state and also a required fuel amount of the engine exceeds a threshold; and is configured to fixedly maintain the manipulated variable at a reference manipulated variable which is set beforehand and is lower than the manipulated variable at which the discharge amount of the fuel pump reaches the maximum amount, when the pressure sensor is in the abnormal operation state and also the required fuel amount of the engine is equal to or less than the threshold. 3. The apparatus according to claim 2, further comprising: a fuel temperature sensor configured to detect a temperature of the fuel in the fuel pipe, wherein the control unit adjusts the reference manipulated variable based on the fuel temperature detected by the fuel temperature sensor. 4. A fuel supply apparatus for an engine, comprising: a fuel injection valve capable of injecting fuel to the engine; a fuel tank capable of storing the fuel for the engine; a fuel pump capable of supplying the fuel in the fuel tank to the fuel injection valve via a fuel pipe; a relief valve capable of returning the fuel in the fuel pipe into the fuel tank when a pressure in the fuel pipe exceeds a threshold; a pressure sensor capable of detecting a pressure of the fuel in the fuel pipe; and a control unit configured to input thereto a signal detected from the pressure sensor to output therefrom a manipulated variable for the fuel pump, wherein the control unit is configured to determine whether the pressure sensor is in a normal operation state or in an abnormal operation state; wherein when the pressure is determined to be in the normal operation state, the control unit is configured to calculate the manipulated variable so that the fuel pressure detected by the pressure sensor approaches a target pressure; wherein when the pressure sensor is determined to be in the abnormal operation state the control unit is configured to fixedly maintain the manipulated variable at a reference manipulated variable corresponding to a reference fuel pressure; and wherein when the manipulated variable is fixedly maintained at the reference manipulated variable, an operation of the engine under a condition that a fuel supply amount to the engine is insufficient is restricted. 5. The apparatus according to claim 4, wherein the control unit outputs a signal for stopping the fuel injection by the fuel injection valve under a condition that the fuel supply amount is insufficient. 6. The apparatus according to claim 4, wherein the control unit outputs a signal therefrom that restricts the throttle opening in the engine to equal to or less than the predetermined opening under the condition that the fuel supply amount is insufficient. 7. The apparatus according to claim 4, wherein the control unit determines whether or not the fuel supply amount is insufficient, based on a required fuel injection amount by the fuel injection valve, an engine rotating speed and the manipulated variable for the fuel pump. 8. A fuel supply apparatus for an engine, comprising: fuel injecting means for injecting fuel to the engine; fuel reserving means for reserving the fuel for the engine; fuel supplying means for supplying the fuel in the fuel reserving means to the fuel injecting means via a fuel pipe; mechanical relieving means for returning the fuel in the fuel pipe into the fuel reserving means when a pressure in the fuel pipe exceeds a threshold; pressure detecting means for detecting a pressure of the fuel in the fuel pipe; and control means for inputting thereto a signal detected from the pressure detecting means to output a manipulated variable for the fuel supply means, wherein the control means is configured to determine whether the pressure detecting means is in a normal state or in an abnormal state; wherein when the pressure detecting means is in the normal state, the control means is configured to calculate the manipulated variable so that the fuel pressure detected by the pressure detecting means approaches a target pressure; and wherein when the pressure detecting means is in the abnormal state, the control means is configured to fixedly maintain the manipulated variable at a manipulated variable at which a discharge amount of the fuel pump reaches a maximum amount, to thereby hold a fuel pressure in the fuel pipe in the vicinity of a valve-opening pressure of the relief valve. 9. A control method of a fuel supply apparatus for an engine, which is provided with a fuel pump capable of supplying fuel in a fuel tank to a fuel injection valve via a fuel pipe; a mechanical relief valve capable of returning the fuel in the fuel pipe into the fuel tank when a pressure in the fuel pipe exceeds a threshold; and a pressure sensor capable of detecting a pressure of the fuel in the fuel pipe, comprising the steps of: determining whether the pressure sensor is in the normal operation state or in an abnormal operation state; calculating, when the pressure sensor is in the normal operation state, a manipulated variable so that the fuel pressure detected by the pressure sensor approaches a target pressure; and fixedly maintaining, when the pressure sensor is determined to be in the abnormal operation state, the manipulated variable at a manipulated variable at which a discharge amount of the fuel pump reaches a maximum amount so that the fuel pressure in the fuel pipe is held in the vicinity of a valve-opening pressure of the relief valve, thereby outputting the maintained manipulated variable to the fuel pump. 10. The method according to claim 9, wherein the step of fixedly maintaining the manipulated variable comprises the steps of: determining whether or not a required fuel amount of the engine exceeds a threshold; fixedly maintaining the manipulated variable at a manipulated variable at which a discharge amount of the fuel pump reaches the maximum amount, thereby holding the fuel pressure in the fuel pipe in the vicinity of the valve-opening pressure of the relief valve, when the required fuel amount of the engine exceeds the threshold; and fixedly maintaining the manipulated variable at a reference manipulated variable which is set beforehand and lower than the manipulated variable at which a discharge amount of the fuel pump reaches a maximum amount when the required fuel amount of the engine is equal to or less than the threshold. 11. The method according to claim 10, further comprising the steps of: detecting a temperature of the fuel in the fuel pipe; and adjusting the reference manipulated variable based on the fuel temperature. 12. A control method of a fuel supply apparatus for an engine, which is provided with a fuel pump capable of supplying fuel in a fuel tank to a fuel injection valve via fuel pipe; a relief valve capable of returning the fuel in the fuel pipe in to the fuel tank when a pressure in the fuel pipe exceeds a threshold; and a pressure sensor capable of detecting a pressure of the fuel in the fuel pipe, comprising the steps of: determining whether the pressure sensor is in a normal operation state or in an abnormal operation state; calculating, when the pressure sensor is in the normal operation state, a manipulated variable so that the fuel pressure detected by the pressure sensor approaches a target pressure; fixedly maintaining, when the pressure sensor is in the abnormal operation state, a manipulated variable at a reference manipulated variable that corresponds to a reference fuel pressure set before hand; outputting the maintained manipulated variable to the fuel pump; and restricting an operation of the engine under a condition that a fuel supply amount to the engine is insufficient, when the manipulated variable is fixedly maintained at the reference manipulated variable that corresponds to the reference fuel pressure. 13. The method according to claim 12, wherein the step of restricting the operation of the engine comprises the step of; outputting a signal stopping the fuel injection by the fuel injection valve under a condition that the fuel supply amount is insufficient. 14. The method according to claim 12, wherein the step of restricting the operation of the engine comprises the step of; outputting a signal restricting the throttle opening in the engine to equal to or less than the predetermined opening under a condition that the fuel supply amount is insufficient. 15. The method according to claim 12, wherein the step of restricting the operation of the engine comprises the steps of: detecting a required fuel injection amount in the fuel injection valve; detecting an engine rotating speed; detecting the manipulated variable for the fuel pump; and determining whether or not the fuel supply amount is insufficient based on the required fuel injection amount in the fuel injection valve, the engine rotating speed and the manipulated variable for the fuel pump. 16. A fuel supply apparatus for an engine, comprising: fuel injecting means for injecting fuel to the engine; fuel reserving means for reserving the fuel for the engine; fuel supplying means for supplying the fuel in the fuel reserving means to the fuel injecting means via a fuel pipe; relieving means for returning the fuel in the fuel pipe into the fuel reserving means when a pressure in the fuel pipe exceeds a threshold; pressure detecting means for detecting a pressure of the fuel in the fuel pipe; and control means for inputting thereto a signal detected from the pressure detecting means to output a manipulated variable for the fuel supply means, wherein the control means is configured to determine whether the pressure detecting means is in a normal state or in an abnormal state; wherein when the pressure detecting means is in the normal state, the control means is configured to calculate the manipulated variable so that the fuel pressure detected by the pressure detecting means approaches a target pressure; wherein when the pressure detecting means is in the abnormal state, the control means is configured to fixedly maintain the manipulated variable at a reference manipulated variable that corresponds to a reference fuel pressure; and wherein when the manipulated variable is fixedly maintained at the reference manipulated variable, an operation of the engine under a condition that a fuel supply amount to the engine is insufficient is restricted.
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이 특허에 인용된 특허 (6)
Hemmerlein Rodney J. ; West Stephen, Apparatus and method for diagnosing erratic pressure sensor operation in a fuel system of an internal combustion engine.
Hemmerlein Rodney J. ; West Stephen, Apparatus and method for diagnosing erratic pressure sensor operation in a fuel system of an internal combustion engine.
Olson David ; Musser Keith L. ; West Stephen ; Raghunathan Shyamala ; Stavnheim Jonathan A., Apparatus for controlling a fuel system of an internal combustion engine.
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