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Control device for high-pressure fuel pump

A technology of a high-pressure fuel pump and a control device, which is applied in the directions of a fuel injection device, a fuel injection pump, a charging system, etc., can solve the problem that the high-pressure fuel pump cannot discharge fuel, etc.

Pending Publication Date: 2022-07-29
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To make the high-pressure fuel pump quiet, it is enough to reduce the driving current of the high-pressure fuel pump, but if the driving current is too reduced, the high-pressure fuel pump cannot discharge fuel

Method used

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  • Control device for high-pressure fuel pump
  • Control device for high-pressure fuel pump
  • Control device for high-pressure fuel pump

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0105]

[0106] The control device 800 of the first embodiment (refer to Figure 8 ) by the current I to the solenoid 205, that is, the peak current Ia that gives the momentum for starting valve closing to the suction valve 203 in the stationary state, and the switching is performed within the range of the current lower than the maximum value of the peak current Ia to The high-pressure fuel pump 103 is controlled by maintaining the holding current Ib of the intake valve 203 in the valve-closed state. In addition, there is a saturation range of the current application amount of the peak current Ia, that is, when the peak current application amount of the peak current Ia is decreased from a value sufficient to close the high-pressure fuel pump 103, the closing speed of the intake valve 203 decreases until When the peak current application amount becomes smaller than a certain application amount up to a certain application amount, the valve closing speed of the suction valve 20...

no. 2 Embodiment approach

[0120]

[0121] Next, a configuration example and an operation example of a control device for a high-pressure fuel pump according to a second embodiment of the present invention will be described. The high-pressure fuel pump regarded as a control target in the present embodiment is the same as the high-pressure fuel pump regarded as a control target in the first embodiment. In addition, the operation of the control device of the second embodiment to control the valve opening and closing of the high-pressure fuel pump by the peak current Ia and the holding current Ib is also the same as the control performed by the control device of the first embodiment. However, the control device of the high-pressure fuel pump of the first embodiment is as Figure 5 As shown, the peak current integral value II is controlled so that the current application amount becomes smaller than the current application amount limit value. In contrast to this, the control device for the high-pressure fu...

no. 3 Embodiment approach

[0137]

[0138] Next, a configuration example and an operation example of a control device for a high-pressure fuel pump according to a third embodiment of the present invention will be described. The high-pressure fuel pump regarded as a control target in the present embodiment is the same as the high-pressure fuel pump regarded as a control target in the first embodiment. In addition, the operation of controlling the valve opening and closing of the high-pressure fuel pump by the control device of the third embodiment by the peak current Ia and the holding current Ib is also the same as the control performed by the control device of the first embodiment. In the first embodiment, it is necessary to store the information on the dead zone of the speed vel_Tb just before the valve closing is completed, but in the third embodiment, it is based on the valve closing completion time Tb detected when the peak current integral value II is changed. changes are controlled, so no dead ...

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PUM

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Abstract

The present invention performs mute control on a high-pressure fuel pump by reducing noise generated when an armature collides with a fixed iron core. This control device (800) for a high-pressure fuel pump controls a suction valve that opens and closes an inlet through which fuel flows into a pressurization chamber by energizing a solenoid (205) in synchronization with the reciprocating motion of a plunger. The current flowing to the solenoid (205) is composed of a peak current that applies a force for starting valve closing to the suction valve in a stationary state, and a holding current that opens and closes in a range lower than the maximum value of the peak current so as to hold the suction valve in a closed state. When the control device (800) reduces the peak current application amount of the peak current from a value sufficient to close the high-pressure fuel pump, the valve closing speed of the suction valve is reduced to a certain application amount, and when the peak current application amount becomes smaller than the certain application amount, the valve closing speed of the suction valve is saturated. The control device (800) controls the current application amount of the peak current so as to fall within the saturation range.

Description

technical field [0001] The present invention relates to a control device for a high pressure fuel pump. Background technique [0002] Internal combustion engines in automobiles require high efficiency, low emissions, and high power. As a balanced solution to these needs, direct-injection internal combustion engines have been around for a long time. Automakers and suppliers have made unremitting efforts to increase the value of their products, and one of the important issues is the muteness of high-pressure fuel pumps. To mute the high-pressure fuel pump, it is sufficient to reduce the driving current of the high-pressure fuel pump. However, if the driving current is reduced too much, the high-pressure fuel pump cannot discharge fuel. The amount of current application most suitable for muting varies depending on the individual high-pressure fuel pump. In the conventional pump silent control, the technique disclosed in the following Patent Document 1 is used in order to fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M59/36F02M59/44
CPCF02M59/36F02M59/44F02D41/3082F02D2200/025F02D41/20F02D2041/2037F02D2041/2034F02D2041/1432F02D2041/1409F02D41/1401F02D2041/2055F02D2041/2058F02M59/368
Inventor 青野俊宏向原修德尾健一郎中居裕贵大木幸太郎有冨俊亮宫本明靖
Owner HITACHI ASTEMO LTD