DE102018203328A1 - Device for adding a fluid to a combustion air of an internal combustion engine - Google Patents

Abstract

Device for admixing a fluid in a combustion air of an internal combustion engine for a motor vehicle, with a fluid container from which the fluid can be removed and the combustion air can be supplied, wherein the fluid in the fluid container can be heated by means of microwave radiation.
The inventive design, the fluid can be heated and decontaminated quickly and energetically meaningful point of view.

Description

The invention relates to a device for admixing a fluid in a combustion air of an internal combustion engine with the features of the preamble of patent claim 1.

The technical environment, for example, the German patent specification DE 100 26 695 C1 pointed. From this patent a method and a device for recovering water from an exhaust system are known. The invention relates to a method and a device for generating a required amount of water by condensation of the water vapor contained in the exhaust gas, in particular for a water injection system of the internal combustion engine. Here, the condensed water is guided with a line arrangement and stored in a container. According to the invention, the required amount of water is condensed out of the exhaust gas by means of a condensation device which has an average condensation efficiency of at least 25%, preferably at least 50%, over the entire operating range of the internal combustion engine. In this way, a provision of additional water is avoided in a separate and refillable tank and still allows a permanent extraction of water from the exhaust gas. Next is from the European patent EP 2 789 839 B1 a method for water injection for an internal combustion engine, in which only in certain load ranges of the internal combustion engine water is injected via first injectors in the combustion chambers of the internal combustion engines. Thus, depending on the load range, fuel is injected either directly via the first injectors into the combustion chambers of the internal combustion engine or via second injectors into a suction pipe upstream of the combustion chambers. In a third load range, which is substantially at full load in a medium speed range, water is injected via the first injectors into the combustion chambers and fuel is injected into the intake manifold exclusively via the second injectors.

The technical environment is further on the European patent specification EP 2 778 381 B1 pointed. From this a method for operating an injection system for injecting water into an injection region of an internal combustion engine by means of an injector with a water-filled in a normal operation of the internal combustion engine working space is known. The method is characterized in that when switching off the internal combustion engine, at least a portion of the present in the working space of the injector water is displaced by a flowing from the combustion chamber of the internal combustion engine into the working space gas mixture and the working space is at least partially filled with the gas mixture.

• - Erfassen einer Klopfstärke in dem Zylinder mittels eines Klopfsensors,
• - Einstellen eines einer Soll-Abgastemperatur entsprechenden vorbestimmten Soll-Zündwinkels des Zylinders und
• - Steuern einer Fluidbeimischung in den Zylinder in Abhängigkeit von der erfassten Klopfstärke.

Next is from the European patent application EP 3 023 619 A1 , from which the present invention proceeds, discloses a method for controlling combustion in an internal combustion engine having at least one cylinder, the method comprising the following steps:

• Detecting a knock magnitude in the cylinder by means of a knock sensor,
• - Setting a desired target exhaust gas temperature corresponding predetermined target ignition angle of the cylinder and
• Controlling a fluid admixture into the cylinder as a function of the detected knock intensity.

For reasons of space, the accommodation of a fluid or water tank inside the vehicle for lack of space and acoustics is not feasible. A sufficient size of the fluid container or of the water tank can currently only be displayed realistically in the rear of the vehicle, since there is usually no space left in the engine compartment. Moreover, due to a non-existent heating system in the rear of the vehicle, ice in the tank may disadvantageously be formed and not thawed, and moreover, biocontamination (eg, propagation of bacteria) can not be eliminated.

Object of the present invention is to avoid the above-mentioned disadvantages.

This object is solved by the features in the characterizing part of patent claim 1.

Advantageously, the possibility according to the invention of heating the fluid in the fluid container by means of microwave radiation is energetically the most effective method of heating water. This microwave technology can easily act from the outside, through the fluid container wall (without contact with the fluid) and is optimal in terms of efficiency. Thus, a bio-decontamination from an energetic point of view makes sense and the thawing speed is much faster than with current systems.

In principle, the same technique can be used according to the invention as in commercially available microwave ovens as a kitchen appliance.

The proposal is for a device for adding a fluid into a combustion air in an internal combustion engine for a motor vehicle, with a fluid container from which the fluid can be removed and combustion air can be supplied. According to the invention, the fluid in the fluid container can be heated by means of microwave radiation.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 10026695 C1 [0002]
• EP 2789839 B1 [0002]
• EP 2778381 B1 [0003]
• EP 3023619 A1 [0004]

Claims (1)

Device for admixing a fluid in a combustion air of an internal combustion engine for a motor vehicle, comprising a fluid container from which the fluid can be removed and the combustion air can be supplied, characterized in that the fluid in the fluid container can be heated by means of microwave radiation.