Fuel-injection device
First Claim
1. A fuel injection device comprising:
- a fuel-injection pump for an engine and at least having a compressor disposed inside a cylinder of the fuel-injection pump wherein a pump plunger is slidably inserted, a high-pressure passage for guiding fuel in the compressor to a fuel injection nozzle, and a fuel-supplying passage for supplying fuel supplied from a fuel-intake to said compressor;
a solenoid valve disposed in the fuel-supplying passage of said fuel-injection pump, and having a valve to adjust the communication conditions between the compressor side and the fuel-intake side of said fuel-supplying passage, and controlling the motion of the valve in response to control signals externally supplied to the solenoid;
a driving pulse forming means for forming a driving pulse having a pulse segment with a large duty ratio during a forced time period and a pulse segment with a duty ratio smaller than that of said forced time period during a limited time period, within the solenoid valve'"'"'s driving period, which is determined by computing the valve-closed time period required to obtain a desired fuel-injection level from an engine throttle position and an engine rotational speed, and by the sum of the time delay in the solenoid valve'"'"'s closing required for said solenoid valve to shut off said fuel-supplying passage and said valve closed-time period;
a solenoid valve driving means for driving said solenoid valve in response to the driving pulse formed by said driving pulse forming means.
2 Assignments
0 Petitions
Accused Products
Abstract
A fuel-injection device includes a solenoid valve which adjusts a fuel-injection level of a fuel-injection pump by adjusting its throttling for the fuel-injection passage to supply the fuel to a compressor. A driving pulse to drive the solenoid valve is formed taking various factors into consideration. For example, the driving pulse is composed of a segment having a large duty ratio and a segment having a small duty ratio in order to secure a responsiveness of the solenoid valve. The driving pulse is formed on the basis of a change in electrical voltage to drive the solenoid valve, varying levels of voltage drop in a wiring harness installed for every cylinder, and of varying levels of responsiveness unique with fuel-injection pumps.
53 Citations
27 Claims
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1. A fuel injection device comprising:
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a fuel-injection pump for an engine and at least having a compressor disposed inside a cylinder of the fuel-injection pump wherein a pump plunger is slidably inserted, a high-pressure passage for guiding fuel in the compressor to a fuel injection nozzle, and a fuel-supplying passage for supplying fuel supplied from a fuel-intake to said compressor; a solenoid valve disposed in the fuel-supplying passage of said fuel-injection pump, and having a valve to adjust the communication conditions between the compressor side and the fuel-intake side of said fuel-supplying passage, and controlling the motion of the valve in response to control signals externally supplied to the solenoid; a driving pulse forming means for forming a driving pulse having a pulse segment with a large duty ratio during a forced time period and a pulse segment with a duty ratio smaller than that of said forced time period during a limited time period, within the solenoid valve'"'"'s driving period, which is determined by computing the valve-closed time period required to obtain a desired fuel-injection level from an engine throttle position and an engine rotational speed, and by the sum of the time delay in the solenoid valve'"'"'s closing required for said solenoid valve to shut off said fuel-supplying passage and said valve closed-time period; a solenoid valve driving means for driving said solenoid valve in response to the driving pulse formed by said driving pulse forming means. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A fuel-injection device comprising:
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a fuel-injection pump for an engine and at least having a compressor disposed inside a cylinder of the fuel-injection pump wherein a pump plunger is slidably inserted, a high-pressure passage for guiding fuel in the compressor to a fuel injection nozzle, and a fuel-supplying passage for supplying fuel supplied from fuel-intake to said compressor; a solenoid valve disposed in the fuel-supplying passage of said fuel-injection pump, and having a valve to adjust the communication conditions between the compressor side and the fuel-intake side of said fuel-supplying passage, and controlling the motion of the valve in response to control signals externally supplied to the solenoid; an electrical source voltage detecting means for detecting an electrical source voltage used to control said solenoid valve; a driving pulse adjusting means for forming a driving pulse, which contains the pulse having a large duty ratio for a forced time period and a subsequent pulse having a duty ratio for a limited time period, within said solenoid valve'"'"'s driving time period determined by the sum of the time delay in the solenoid valve'"'"'s closing required for said solenoid valve to shut off said fuel-supplying passage and the valve-closed time period required to obtain a desired fuel-injection level, computed from an engine throttle position and engine rotational speed, and wherein the duty ratio of said forced time period and that of said limited time period are adjusted according to the electrical source voltage detected by said electrical source voltage detecting means. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A fuel-injection device comprising:
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a fuel-injection pump for an engine and at least having a compressor disposed inside a cylinder of the fuel-injection pump wherein a pump plunger is slidably inserted, a high-pressure passage for guiding fuel in the compressor to a fuel-injection nozzle, and a fuel-supplying passage for supplying fuel supplied from a fuel-intake to said compressor; a solenoid valve disposed in the fuel-supplying passage of said fuel-injection pump, and having a valve to adjust the communication conditions between the compressor side and the fuel-intake side of said fuel-supplying passage, and controlling the motion of the valve in response to control signals externally supplied to the solenoid; a driving circuit for driving and controlling said solenoid valve; a driving pulse forming means for forming a driving pulse that has a pulse width which is determined by the sum of the time delay in the solenoid valve'"'"'s closing required for said solenoid valve to shut off said fuel-supplying passage and the valve-closed time length required for obtaining a desired fuel-injection level, computed from an engine throttle position and engine rotational speed, and is adjusted according to a voltage drop in a connection wire between the solenoid valve of the fuel-injection pump and the driving circuit for driving the solenoid valve; a solenoid valve driving means for driving said solenoid valve in response to the driving pulse output from said driving pulse forming means. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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22. A fuel-injection device comprising:
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a fuel-injection pump assigned to each cylinder of a multicylinder engine, and having a compressor disposed inside a cylinder of the fuel-injection pump wherein a pump plunger is slidably inserted, a high-pressure passage for guiding fuel in the compressor to a fuel injection nozzle, and a fuel-supplying passage for supplying fuel supplied from a fuel-intake to said compressor; a solenoid valve disposed in the fuel-supplying passage of said fuel-injection pump, having a valve to adjust the communication conditions between the compressor side and the fuel-intake side of said fuel-supplying passage, and controlling the motion of the valve in response to control signals externally supplied to the solenoid; a means for detecting a time delay in the solenoid valve'"'"'s closing required for each solenoid valve of the fuel-injection pump to shut off the fuel-supplying passage of the corresponding fuel-injection pump; a driving pulse forming means for forming a pulse that has a pulse width which is determined by the sum of the time delay in the solenoid valve'"'"'s closing detected by said means for detecting the time delay in the solenoid valve'"'"'s closing and of the valve-closed time period required for obtaining a desired fuel-injection level and computed at least from an engine throttle position and engine rotational speed, and corrected so that the time delay in the solenoid valve'"'"'s closing detected by said means for detecting the time delay in the solenoid valve'"'"'s closing will be uniform for every solenoid valve; a solenoid valve driving means for driving said solenoid valve by the driving pulse output from said driving pulse forming means. - View Dependent Claims (23, 24, 25, 26, 27)
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Specification