Fuel injection system, fuel injection control device and control method thereof
A fuel injection system and fuel technology, applied in the direction of fuel injection control, fuel injection device, charging system, etc., can solve problems such as differences in cylinder injection volume
Active Publication Date: 2014-10-15
DENSO CORP
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- Description
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- Application Information
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Problems solved by technology
However, in general, the asynchronization of the pressurized delivery of fuel and the injection of the injector (injector) becomes an important factor for fluctuations in the actual injection amount of the injector, and the injection amount varies among cylinders.
Method used
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Embodiment Construction
[0030] Hereinafter, an embodiment applied to a diesel engine equipped with the common rail fuel injection system (fuel pressurized delivery system) 10 of the present invention will be described with reference to the drawings.
[0031] (Contents of discharge amount calculation processing)
[0032] figure 1 It is an overall configuration diagram showing the configuration of the common rail fuel injection system 10 according to the present embodiment. The common rail fuel injection system 10 is a system for injecting fuel to each cylinder of a 4-cycle (stroke) 4-cylinder diesel engine 80 (hereinafter referred to as an engine), not shown. The common rail fuel injection system 10 includes: four injectors 71 to 74 , a common rail chamber 60 as a pressure accumulator, a high pressure pump 50 for pressurizing fuel to the common rail chamber 60 , and a fuel pump for supplying fuel to the high pressure pump 50 . (feed pump) 30, a supply control valve (SCV) 40 for controlling the fuel ...
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A fuel injection system is provided with the following components: a pressure accumulation part (60); a cylinder (59); a plunger (51) which generates volume change in a pressure chamber (53) through pressurizing movement, thereby pressurizing and conveying fuel to the pressure accumulation part; an injection part which is provided with injectors (71-74) that inject the fuel after pressure accumulation at the pressure accumulation part; and a control part (70) which controls the amount of the fuel that is injected from the injectors. The control part is provided with the following components: a pressurization conveying amount calculation part which calculates the pressurization conveying amount of the fuel that is injected from the injectors to the pressure accumulation part; and a correction amount determination part which determines the correction amount in the injection period based on the pressurization conveying amount in the injection period. The pressurization conveying amount calculation part calculates the leakage amount of the fuel which leaks through a clearance between an inner circumferential surface of the pressure chamber and an outer circumferential surface of the plunger, and calculates the pressurization conveying amount through the calculated leakage amount and the volume change amount in the pressure chamber, wherein the volume change amount corresponds with the plunger stroke in pressurization movement.
Description
technical field [0001] The present invention relates to a technique for pressurizing and injecting fuel, and in particular, relates to a preferred technique for injecting fuel for combustion in an internal combustion engine. Background technique [0002] As a fuel injection system for an internal combustion engine, a common rail (accumulator) type fuel injection system is known. This fuel injection system includes a pressurization pump that pressurizes fuel to a common rail chamber. In recent years, common use, that is, the use of a common pressurization pump for various internal combustion engines, that is, internal combustion engines with different numbers of cylinders (for example, 4-cylinder engines, 5-cylinder engines, 6-cylinder engines, etc.), has been expected. In order to achieve this common use, it is required that fuel can be pressurized and delivered to the common rail chamber even if the combustion cycle of the internal combustion engine (injection cycle of the...
Claims
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IPC IPC(8): F02M63/02F02D41/38
Inventor 安藤充宏
Owner DENSO CORP