Fuel injection control device

A control device and fuel injection technology, which is applied in fuel injection control, electrical control, engine control, etc., can solve the problems of obtaining the valve opening period, unable to detect the valve opening delay time, etc., and achieve the effect of improving the accuracy of injection quantity

Active Publication Date: 2018-02-16
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in a fuel injection valve having a current characteristic without an inflection point, the actual valve opening timing cannot be obtained from the current characteristic, and as a result, there is a problem that the valve opening delay time cannot be detected.

Method used

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no. 1 Embodiment approach

[0029] figure 1 It is a diagram showing a schematic configuration of an internal combustion engine system to which the first embodiment of the fuel injection control device according to the present invention is applied.

[0030] As shown in the figure, this system is mainly composed of an internal combustion engine (hereinafter referred to as the engine) 1, a fuel supply device 7, an engine control module (ECM) 17 for driving the fuel injection valve 2 of the engine 1, an engine control unit (ECU) (fuel Injection control device) 3 constitutes. The fuel supply device 7 supplies fuel from the fuel tank 4 to the fuel injection valve 2 provided in the engine 1 through the fuel pipe 9, and injects a predetermined amount of fuel from the fuel injection valve 2 into the combustion chamber 10. The low-pressure fuel pump 5 is pressurized once, adjusted to a certain pressure by a fuel pressure regulator not shown, and pressurized to a higher pressure secondarily by the high-pressure fu...

no. 2 Embodiment approach

[0098] This second embodiment is a modified form based on the first embodiment, and is the same as the first embodiment except for the following description.

[0099] In the above-mentioned first embodiment, in the cycle of the engine 1 that satisfies the learning condition, one fuel injection is divided into multiple times, and the injection amount ratio of any one or multiple times of them is different in multiple cycles (in the example shown in the figure). 3 cycles), and the injection pulse width (divided injection pulse width) in which the fuel injection valve 2 is controlled to be in the middle lift state is taken as the horizontal axis, and the corresponding valve closing delay time is taken as On the vertical axis, a linear approximation formula is obtained from this, and the valve opening delay time is estimated using the linear approximation formula.

[0100] Alternatively, the injection pulse width of one cycle may be divided into a plurality of times, and the injec...

no. 3 Embodiment approach

[0104] This embodiment is a modified form based on the first embodiment or the second embodiment, and is the same as the first embodiment or the second embodiment except for the following description.

[0105] In the above-mentioned second embodiment, the injection pulse width of one cycle is divided into a plurality of times, and the injection amount ratio of any one of them is changed in at least two consecutive cycles.

[0106] On the other hand, it is also possible to change the injection amount ratio once in two discontinuous cycles.

[0107] Figure 12 It is a diagram showing an example of a determination procedure of the injection pulse width Ti in the third embodiment of the fuel injection control device according to the present invention. In this third embodiment, the injection amount ratio from the first cycle to the third cycle is not changed, and the injection amount ratio is changed arbitrarily from the fourth cycle. The ratio of the injection amount of the 4 cy...

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Abstract

Provided is a fuel injection control device with which the valve opening delay time of a fuel injection valve can be detected with good precision, and highly precise and minute injection control can be implemented. The valve opening delay time of a fuel injection valve 2 is estimated on the basis of multiple valve closing delay times, obtained when the fuel injection valve 2 is operated with different injection pulse widths Ti such that the fuel injection valve 2 is in an intermediate lift state.

Description

technical field [0001] The present invention relates to a fuel injection control device. Background technique [0002] In the fuel injection technology that performs multiple injections, there is known a fuel injection control device that corrects individual differences in fuel injection valves with respect to a small injection amount (for example, refer to Patent Document 1). In this conventional fuel injection control device, injection amount accuracy is improved by suppressing fluctuations in the injection amount relative to the main injection amount when multiple injections of a small amount of pre-injection are performed prior to the main injection. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: Japanese Patent Laid-Open No. 2003-314338 Contents of the invention [0006] The problem to be solved by the invention [0007] However, in the conventional fuel injection control device described in the aforementioned Patent Document 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/20
CPCF02D41/247F02D41/402F02D2200/063F02D41/20F02D2041/2055Y02T10/40F02D41/3005
Inventor 石浩云奥田雄希丰原正裕
Owner HITACHI ASTEMO LTD
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