Device for controlling fuel pressure of engine and method thereof
First Claim
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1. A device for controlling the fuel pressure of an engine comprising:
- fuel pressure detecting means for detecting the fuel pressure supplied from a fuel pump to a fuel injection valve through a fuel supply passage equipped with a check valve;
fuel pressure feedback control means for feedback controlling the drive of the fuel pump so that the fuel pressure in the fuel supply passage will become a target fuel pressure;
operation stop detecting means for detecting an engine operation stop;
engine environmental temperature detecting means for detecting an engine environmental temperature condition; and
operation stop time fuel pressure adjusting means for adjusting the fuel pressure in the fuel supply passage, during the engine operation stop, to become a pressure that meets the engine environmental temperature condition during the engine operation stop, by said fuel pressure feedback control means.
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Abstract
In a fuel pressure control system of a non-return system which feedback controls the fuel pressure supplied to a fuel injection valve to meet the fuel supply amount, a fuel pressure in a fuel supply passage is feedback controlled to become a pressure corresponding to the engine environmental temperature condition of during the engine operation stop.
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Citations
10 Claims
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1. A device for controlling the fuel pressure of an engine comprising:
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fuel pressure detecting means for detecting the fuel pressure supplied from a fuel pump to a fuel injection valve through a fuel supply passage equipped with a check valve;
fuel pressure feedback control means for feedback controlling the drive of the fuel pump so that the fuel pressure in the fuel supply passage will become a target fuel pressure;
operation stop detecting means for detecting an engine operation stop;
engine environmental temperature detecting means for detecting an engine environmental temperature condition; and
operation stop time fuel pressure adjusting means for adjusting the fuel pressure in the fuel supply passage, during the engine operation stop, to become a pressure that meets the engine environmental temperature condition during the engine operation stop, by said fuel pressure feedback control means. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling the fuel pressure of an engine, comprising the steps of:
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detecting a fuel pressure supplied from a fuel pump to a fuel injection valve through a fuel supply passage equipped with a check valve;
feedback controlling the drive of the fuel pump so that the fuel pressure in the fuel supply passage becomes a target fuel pressure;
detecting an engine operation stop;
detecting an engine environmental temperature condition when the engine operation stop is detected; and
adjusting the fuel pressure in the fuel supply passage to meet the engine environmental temperature condition during the engine operation stop by feedback controlling the drive of the fuel pump. - View Dependent Claims (7, 8, 9, 10)
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Specification