Multifuel internal-combustion engine

An internal combustion engine, multi-fuel technology, applied in liquid fuel feeders, internal combustion piston engines, combustion engines, etc., can solve the problems of increased PM and soot generation, and achieve noise suppression, torque fluctuation suppression, NOx suppression The effect of increasing the amount of production

Inactive Publication Date: 2011-04-13
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when performing compression self-ignition diffusion combustion using fuel with low compression ignitabilit...

Method used

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  • Multifuel internal-combustion engine
  • Multifuel internal-combustion engine
  • Multifuel internal-combustion engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] Below, according to Figure 1 to Figure 7 Embodiment 1 of the multi-fuel internal combustion engine according to the present invention will be described. The multi-fuel internal combustion engine is an internal combustion engine that operates by introducing at least one fuel of at least two fuels having different properties into a combustion chamber, or introducing a mixed fuel composed of the at least two fuels into the combustion chamber. In this embodiment, the latter multi-fuel internal combustion engine is taken as an example for description.

[0067] This multi-fuel internal combustion engine, with figure 1 The illustrated electronic control unit (ECU) 1 performs various control operations such as combustion control. This electronic control device 1 is composed of a CPU (Central Processing Unit) not shown in the figure, a ROM (ReadOnly Memory) in which predetermined control programs, etc. are stored in advance, and a RAM (Random Access Memory: random access mem...

Embodiment 2

[0137] Second, according to Figure 8 and Figure 9 Embodiment 2 of the multi-fuel internal combustion engine according to the present invention will be described.

[0138] Generally, if the in-cylinder pressure in the combustion chamber CC can be detected, the ignition timing of the pre-injected fuel or the increase rate of the in-cylinder pressure can be grasped from the change in the pressure. Thus, in the multi-fuel internal combustion engine of Embodiment 1 described above, in a case where the in-cylinder pressure can be detected or estimated, it can be judged whether or not the pre-injected fuel is undergoing rapid combustion. In addition, the larger the pre-injection amount FP, the higher the cylinder pressure, and the increase rate of the cylinder pressure due to the pre-injection can be reversed to calculate the pre-injection amount FP. Therefore, by feeding back the increase rate of the in-cylinder pressure at the time of the next pre-injection, even if the Figur...

Embodiment 3

[0159] Second, based on Figure 10 Embodiment 3 of the multi-fuel internal combustion engine according to the present invention will be described.

[0160] In each of the above-mentioned Embodiments 1 and 2, an example of a so-called direct-injection multi-fuel internal combustion engine in which the mixed fuel of the first fuel F1 and the second fuel F2 is directly injected into the combustion chamber CC was exemplified. However, this Embodiment 3 exemplifies a multi-fuel internal combustion engine in which this mixed fuel is injected not only into the combustion chamber CC but also into the intake port 11b.

[0161] For example, this kind of multi-fuel internal combustion engine can be replaced by the fuel supply device 50 in the multi-fuel internal combustion engine of each embodiment 1, 2 Figure 10 The fuel supply device 150 shown is constructed. In addition, the Figure 10 The case based on the multi-fuel internal combustion engine of the first embodiment is exemplifi...

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Abstract

A multifuel internal-combustion engine which improves the ignitability of low-compressed ignitable fuels inside a combustion chamber (CC) at the time of a compressed self ignition diffusive combustion mode of operation. The multifuel internal-combustion engine is operated in a manner that at least one of not less than two kinds of fuels (F1, F2) of different nature is guided into the combustion chamber (CC) or a mixed fuel composed of not less than two kinds of fuels (F1, F2) is guided into the combustion chamber (CC). An electronic controller unit (1) has a fuel characteristics detection means to detect a ignitability index value indexed for compressed ignitability of a fuel itself guided into the combustion chamber (CC), and a fuel injection control means to inject a fuel inside the combustion chamber (CC) which is judged to be low-compressed ignitable based on detected ignitability index value prior to a given time during a period from intake stroke to compression stroke at the time of the compressed self ignition diffusive combustion using such a fuel, and to guide a low-compressed ignitable fuel into the combustion chamber (CC) by subsequent main injection.

Description

technical field [0001] The present invention relates to a multi-fuel internal combustion engine. The multi-fuel internal combustion engine operates by introducing at least one fuel of at least two fuels with different properties into a combustion chamber, or introducing a mixed fuel composed of the at least two fuels into a combustion chamber. run. Background technique [0002] In the past, a so-called multi-fuel internal combustion engine that operates on a plurality of fuels with different properties has been known. For example, in Patent Document 1 described below, a multi-fuel internal combustion engine is disclosed that injects low-octane fuel into a mixture of high-octane fuel injected by an intake pump to The self-ignition of the low-octane fuel serves as a starting point, and the flame-propagation combustion of the high-octane fuel mixture can thereby increase the combustion speed and shorten the time until the combustion is completed, so knocking can be prevented. ...

Claims

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Application Information

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IPC IPC(8): F02D41/38F02D41/40F02D45/00
CPCF02D19/0692F02D2200/0612F02D19/0689F02D19/0694F02D2200/0414Y02T10/44F02D35/023F02B3/06F02D41/401F02D35/021F02B2075/125Y02T10/123F02D2200/0408F02D19/0636F02B2275/16F02D19/0649F02D13/0226F02D41/3076F02M37/0088F02M37/0064Y02T10/36F02D35/02F02D19/081F02B23/101F02D41/403F02D41/0025F02B17/005F02D35/028F02D19/061F02D19/0665F02D2200/0611Y02T10/12Y02T10/30Y02T10/40
Inventor 丹野史朗伊藤泰志
Owner TOYOTA JIDOSHA KK
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