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Method and device for starting an internal combustion engine with a high alcohol content in the fuel

A technology of internal combustion engine and alcohol, which is applied in the direction of mechanical equipment, combustion engine, engine starting, etc. It can solve the problems affecting the viscosity of engine oil and the mechanical durability of engine components, and achieve the effect of precise control

Active Publication Date: 2021-11-23
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Furthermore, the input of unburned fuel into the engine oil during a cold start and subsequent warm-up is very high, thereby negatively affecting the viscosity of the engine oil and thus the mechanical durability of certain engine components

Method used

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  • Method and device for starting an internal combustion engine with a high alcohol content in the fuel
  • Method and device for starting an internal combustion engine with a high alcohol content in the fuel
  • Method and device for starting an internal combustion engine with a high alcohol content in the fuel

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Embodiment Construction

[0026] figure 1 A mixture of mixtures can be shown in a high ethanol share of the fuel, in particular in the fuel, in particular as a fuel (E100), which is operated as a fuel (E100). Here, only components required to understand the present invention are shown. In particular, the ignition device required for the ignition of the fuel / air mixture and the exhaust gas rendering device present in the exhaust tract are removed.

[0027] When the fuel is introduced (front) intake manifold, and thus the fuel air mixture is formed outside the combustion chamber, the fuel air mixture involves the formation of an outer portion of the gasoline engine. This is also referred to as channel injection.

[0028] The internal combustion engine 1 has an intake passage 2, has a engine set and a cylinder head 3, and an exhaust tract 4 of 4 cylinders Z1 to Z4.

[0029] The internal combustion engine 1 delivers the fresh air required to combust the fuel through the intake passage 2. Look at the flow di...

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Abstract

The invention relates to a method for starting an internal combustion engine, which is divided into phases (Ph1-Ph4) which proceed sequentially in time, wherein the first phase begins directly after activation of the starting process (t=0) of the internal combustion engine In (Ph1), the opening degree of the throttle valve (TPS_ST) is adjusted to a value close to zero, so that the pressure (MAP) in the intake port is reduced to a value below the ambient pressure (AMP). A fuel mass (MFF_ST) is injected into the intake port, resulting in a lambda value above the rich burn limit. In the second phase (Ph2 ), the fuel mass (MFF_ST) decreases relative to the reduced pressure (MAP) in the intake port. In the shorter third phase (Ph3), the fuel mass (MFF_ST) is further reduced. The opening of the throttle valve (TPS_ST) increases, so that the pressure (MAP) in the intake tract increases again. In the fourth phase (Ph4), the fuel mass (MFF_ST) increases according to the increased pressure (MAP) in the intake port.

Description

Technical field [0001] The present invention relates to a method and apparatus for starting an internal combustion engine, wherein the internal combustion engine is supplied with a high alcoholic amount of fuel. Background technique [0002] A vehicle is known, which can operate not only from alcohol fuel or alcohol, ie, with a variable alcohol content, but also operate as a unique fuel component with gasoline. Alcohol, such as methanol or ethanol in the fuel, can be present in the range of 0 to 100% in different parts. Such fuels are also referred to as "flex fuel" or "flexibelfuel" (FF), and can be used to operate a flexible fuel vehicle (FFV). In Europe and the United States, alcohol / gasoline mixtures are, for example, E85, ie 85% alcohol in the fuel, of which gasoline share is therefore 15%. In some countries, ethanol share in fuel is reduced in winter months, such as 75%. In Brazil, E100 is also provided as a fuel, i.e., pure ethanol to operate an internal combustion engin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/06F02D41/34F02D19/08F02D33/02F02D41/24F02N19/00
CPCF02D41/061F02D41/064F02D41/34F02D19/084F02D41/0002F02D2200/021F02D2200/0406F02D2200/703F02N2019/002F02D41/2409F02D2200/101F02D41/0025Y02T10/30Y02T10/40
Inventor R.O.贝克曼
Owner VTESCO TECH GMBH