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Control devices for internal combustion engines

一种控制装置、内燃机的技术，应用在内燃机测试、发动机控制、内燃活塞发动机等方向，能够解决降低PN多级喷射技术、不能设定燃料喷射时期等问题

Active Publication Date: 2018-10-19
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the knock sensor installed in the above-mentioned existing internal combustion engine is a mode of conducting the vibration of the internal combustion engine, so when the fuel injector noise is generated in the knock window, there is a possibility that the noise is misdetected as a knock sound, which may cause The problem of not being able to set the fuel injection timing in the knock window, such as not being able to fully realize the potential of the multi-stage injection technology with reduced PN

Method used

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  • Control devices for internal combustion engines
  • Control devices for internal combustion engines
  • Control devices for internal combustion engines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0042] figure 1 It is a diagram showing the overall structure of an internal combustion engine according to Embodiment 1 of the control device for an internal combustion engine according to the present invention, for example, a diagram showing a four-cylinder gasoline engine for an automobile implementing spark ignition type combustion.

[0043] The illustrated engine (internal combustion engine) 100 is provided with an appropriate position of the intake pipe 6: an air flow sensor 1 for metering the amount of intake air; an electronically controlled throttle (throttle) 2 for adjusting the pressure of the intake pipe 6; The sensor 15, which is one form of an intake air temperature detector, measures the intake air temperature; and the intake air pressure sensor 21 measures the pressure in the intake pipe 6.

[0044] Also, the engine 100 is provided with a fuel injection device (also referred to as in-cylinder direct injection) for injecting fuel into the combustion chamber 12 o...

Embodiment approach 2

[0076] exist Figure 6 In the shown relationship between the knock intensity and the ion differential value vibration intensity, there are cases where the ion differential value vibration intensity deviates from the overall correlation even with the same knock intensity (for example, point A).

[0077] refer to Figure 10 and Figure 11 Outline its rationale: Figure 10 As shown, when the absolute value of the ion current signal is large, the detonation vibration component contained in the ion current also becomes large. On the other hand, as Figure 11 As shown, the knock vibration component contained in the ion current also becomes small when the absolute value of the ion current signal is small. Since the ionic current changes its waveform every combustion cycle in the same way as the combustion pressure, the absolute value of the ionic current signal at the time of knocking as the base (base), even if the knocking intensity is the same, the vibration intensity of the io...

Embodiment approach 3

[0094] In the above-mentioned Embodiment 2, the ion differential value vibration intensity was normalized based on the ion integral value obtained by integrating the time-series signal of the ion current value in the period, and it is considered that by dividing the ion differential value by the corresponding Pre-normalizing the ion current value at a certain time can eliminate the influence of the absolute value of the ion current signal as the base, further improve the correlation between the knocking intensity and the vibration intensity of the ion differential value, and further improve the engine's ability to generate knocking noise. Detection accuracy.

[0095] Figure 16 It is a graph showing the relationship between the knock intensity and the ion change rate vibration intensity. Here, the vibration intensity of the ion change rate is a normalized value (also referred to as ion change rate) calculated by dividing the ion differential value by the ion current value (io...

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Abstract

The present invention provides a control device for an internal combustion engine capable of precisely detecting the combustion state of the internal combustion engine, such as generation of knocking noise, from ion current signals with a simple structure. A control device (20) for an internal combustion engine (100) provided with an ion current value detection unit (42) for detecting an ion current value during combustion includes an ion current signal processing unit (201) for signal processing the ion current value and an ion current signal processing unit (201) based on the ion current value The current signal processing unit (20l) detects the combustion state detection unit (20m) of the internal combustion engine (100), and the ion current signal processing unit (20l) includes a differentiation unit (20la) for calculating the differential value of the ion current value.

Description

technical field [0001] The present invention relates to a control device for an internal combustion engine, such as a control device for an internal combustion engine that detects its combustion state using ion current generated during combustion. Background technique [0002] In recent years, in vehicles such as automobiles, restrictions on fuel consumption and exhaust gas have been strengthened, and such restrictions are expected to be further strengthened in the future. In particular, the regulation of fuel consumption has become a matter of great interest due to problems such as the rise in fuel prices in recent years, the influence on global warming, and energy depletion. [0003] Under such circumstances, for example, in the automobile industry, various technological developments have been carried out for the purpose of improving the fuel consumption performance and exhaust performance of vehicles. As one of such technologies developed for the purpose of improving fue...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D45/00F02P17/12G01M15/04
CPCF02P17/12F02D35/021F02P2017/128F02D41/28F02D2041/288F02D2200/1002F02D2200/101G01L23/227F02P5/152Y02T10/40F02D41/22F02D2041/286F02D2200/1015F02D35/027F02P5/145G01M15/05G01R19/10
Inventor 真户原伸也熊野贤吾赤城好彦
Owner HITACHI ASTEMO LTD