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Accumulator-type fuel injection apparatus and internal combustion engine provided with that accumulator-type fuel injection apparatus

A fuel injection device and accumulator technology, which is applied in the directions of fuel injection device, fuel injection pump, fuel injection control, etc., can solve the problems of rough control accuracy of discharge amount, expansion of lift amount, and deterioration of control accuracy of common rail internal pressure. , to achieve the effect of reducing fuel consumption, reducing noise and improving adjustment accuracy

Inactive Publication Date: 2010-02-17
YANMAR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the amount of fuel delivered from the pump to the rail is increased as described above (hereinafter referred to as the pump discharge amount), the plunger diameter and lift of the pump will increase, and the control accuracy of the discharge amount will become rough. As a result, there is a common rail Deterioration of internal pressure control accuracy

Method used

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  • Accumulator-type fuel injection apparatus and internal combustion engine provided with that accumulator-type fuel injection apparatus
  • Accumulator-type fuel injection apparatus and internal combustion engine provided with that accumulator-type fuel injection apparatus
  • Accumulator-type fuel injection apparatus and internal combustion engine provided with that accumulator-type fuel injection apparatus

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no. 1 approach

[0071] In the first embodiment, a case where the present invention is applied to a 6-cylinder marine diesel engine will be described.

[0072] -Description of the configuration of the fuel injection device-

[0073] First, the overall configuration of a fuel injection device applied to an engine according to the first embodiment will be described. figure 1 It is a diagram showing an accumulator type fuel injection device included in a 6-cylinder marine diesel engine.

[0074] This accumulator type fuel injection device has a plurality of fuel injection valves (hereinafter referred to as injectors) 1, 1, ... installed corresponding to each cylinder of a diesel engine (hereinafter referred to as the engine), and the pressure of the accumulated pressure is relatively high (in the common rail). pressure: for example, 100 MPa) common rail 2 of high-pressure fuel, and high-pressure pump 8 as a fuel pump that pressurizes the fuel sucked in from the fuel tank 4 through the low-press...

no. 2 approach

[0101] In the second embodiment, a case where the present invention is applied to an accumulator-type fuel injection device included in a fuel supply system of a 6-cylinder marine diesel engine will be described. In addition, since it is the same as the first embodiment except for the following points, the same reference numerals are attached to the same components, and differences will be mainly described.

[0102] Figure 6 It shows the accumulator-type fuel injection device included in the 6-cylinder marine diesel engine according to the second embodiment. The second embodiment is characterized in that the drive state of the high-pressure pump 8 can be switched according to the operating state of the engine body E. As shown in FIG.

[0103] Therefore, instead of the actuator control member 12D of the controller 12 of the first embodiment, the controller 112 of the second embodiment has a pressure feeding unit control member 112D for controlling the fuel pressure feeding op...

Embodiment approach

[0113] In the embodiments described above, the case where the present invention is applied to a 6-cylinder marine diesel engine has been described. The present invention is not limited thereto, and can be applied to various types of engines such as 4-cylinder marine diesel engines. In addition, the invention is not limited to marine engines, but can also be applied to engines used for other purposes such as vehicles.

[0114] In addition, in the above embodiment, when the fuel injection amount required by the engine main body E is small and the common rail internal pressure reaches the target value, the drive of the first actuator 88 is stopped, and only the second actuator 89 is driven, and only the second actuator 89 is driven. The fuel pumping operation from the second pump chamber group 8B is performed, but only the fuel pumping operation from the second pump chamber group 8B may be performed according to other conditions (for example, engine speed, cooling water temperatu...

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Abstract

The invention provides an accumulator-type fuel injection apparatus and an internal combustion engine provided with that accumulator-type fuel injection apparatus. In one embodiment, the high-pressurepump (8) for providing a pressurized supply of fuel in an engine furnished with a common rail type fuel injection apparatus is provided with two actuators (88, 89). Of these actuators (88, 89), one (88) is stopped and the operation for providing a pressurized supply of fuel is performed from only the other actuator (89), so that the timing at which the load torque that acts on the crankshaft of the engine becomes a local maximum and the timing at which the load torque that acts on the driveshaft of the high-pressure pump (8) becomes a local minimum are made to coincide with one another.

Description

[0001] This application is a divisional application of the application number 200580009002.6, the application date is July 7, 2005, and the title of the invention is "accumulator fuel injection device and internal combustion engine with the same". technical field [0002] The present invention relates to an accumulator type (common rail type) fuel injection device having a pressure accumulation piping (so-called common rail) used in a fuel supply system of an internal combustion engine (such as a diesel engine), and an internal combustion engine having the same. In particular, the present invention relates to a measure for enabling the idle speed to be set low while suppressing vibration of the internal combustion engine, and a measure for enabling high-precision adjustment of the common rail internal pressure. Background technique [0003] Conventionally, as a fuel supply system for a multi-cylinder diesel engine or the like, an accumulator fuel injection device having bette...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M39/02F02M47/02F02M59/20F02D41/04
CPCY02T10/123Y02T10/12
Inventor 大谷知广足立仁古东文哉盐见秀雄
Owner YANMAR CO LTD