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Drives for fuel injection devices

Technology of a fuel injection device and driving device

Active Publication Date: 2020-06-19
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many cases where the high-voltage source accumulates the voltage of the low-voltage source, but when re-injection of fuel is performed under the condition that the injection interval of the multi-stage injection is shortened and the voltage value of the high-voltage source has not returned to the initial value, the Depending on the voltage applied to the coil, the value of the current flowing through the coil changes, and even when the same injection pulse width is supplied, the injection amount may be uneven.

Method used

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  • Drives for fuel injection devices
  • Drives for fuel injection devices
  • Drives for fuel injection devices

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Below, use Figure 1 to Figure 7 , a fuel injection system comprising a fuel injection device, a pressure sensor, and a driving device according to the present invention will be described.

[0037] First, use figure 1 The structure of the fuel injection system will be described. figure 1 It is a schematic diagram showing the configuration of a fuel injection system when a fuel injection device, a pressure sensor, a drive device, and an ECU (Engine Control Unit) according to the first embodiment of the present invention are mounted on an in-cylinder direct injection engine. also, figure 1 The structure of is also applicable to the second embodiment.

[0038] The fuel injection system of this embodiment is composed of fuel injection devices 101A to 101D, fuel rail 105, pressure sensor 102, fuel pump 106, fuel piping 120, drive unit 150, ECU, and the like.

[0039] The fuel injection devices 101A to 101D are installed in the respective cylinders so that the fuel spray fr...

Embodiment 2

[0118] use Figure 8 and Figure 12 The method of correcting the injection amount unevenness according to the second embodiment of the present invention will be described. In addition, the fuel injection device and the driving device in this embodiment have the same configuration as that of the first embodiment. Figure 12 is for the driving device of the fuel injection device according to the second embodiment of the present invention, showing the case where the voltage value of the high voltage source is not lowered and the voltage value is lowered. Figure 8 The diagram of the driving current and valve body displacement under the injection pulse width at point 815 and the driving current and valve body displacement under the injection pulse width at point 802 are shown.

[0119] Figure 12 will be in Figure 8 At the injection pulse width of point 802, the driving current waveform when the voltage of the high voltage source 514 is not lower than the initial value (boost...

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Abstract

The objective of the present invention is to correct deviation in the injection amount and changes in the injection timing when the voltage of a high-voltage source for a drive device decreases. This drive device for a fuel injection device is equipped with a function whereby, when the pulse width of the injection pulse is set to an energization time 815 that closes a valve after a drive current has been switched to a maintenance current, the injection pulse width when the voltage of a high-voltage source has decreased is corrected so as to be longer than the injection pulse width when the voltage of the high-voltage source has not decreased, and, when the pulse width of the injection pulse is set to an energization time 804' that closes the valve before the drive current has been switched to the maintenance current, the absolute value of the amount of correction of the injection pulse width is made smaller than when the injection pulse width is set to the energization time 815 that closes the valve after the drive current has been switched to the maintenance current.

Description

technical field [0001] The invention relates to a drive device for driving a fuel injection system of an internal combustion engine. Background technique [0002] In recent years, with the strengthening of emission control, the engine is required to suppress the total amount of unburned particles (PM: Particulate Matter) and its number, that is, the number of unburned particles (PN: Particulate Number) when driving in the suppression mode, so it is required to control the trace amount The injection quantity of the fuel injection device. As a method for suppressing the generation of unburned particles, it is effective to divide the spray in one combustion stroke into multiple injections (hereinafter referred to as split injection). By performing split injection, the adhesion of fuel to the piston and cylinder wall can be suppressed, so the injected fuel is easily vaporized, and the total amount (PN) of unburned particles and their number, that is, the number of unburned part...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/40F02D41/38
CPCF02D41/20F02D41/3809F02D41/40F02D41/401F02D41/402F02D2041/2006F02D2041/2017F02D2041/2027F02D2041/2055F02D2041/2082F02D2041/389F02D2200/0602Y02T10/40F02D41/008F02D2041/2003F02D2041/2051F02M51/061
Inventor 草壁亮堀井智昭木村慎吾板谷隆树永瀬满山冈士朗
Owner HITACHI ASTEMO LTD