WO2019001884A1

WO2019001884A1 - Water injection device for an internal combustion engine of a motor vehicle

Info

Publication number: WO2019001884A1
Application number: PCT/EP2018/064155
Authority: WO
Inventors: Julian HAGENLOCH; Peter Schenk
Original assignee: Robert Bosch Gmbh
Priority date: 2017-06-30
Filing date: 2018-05-30
Publication date: 2019-01-03
Also published as: BR112019027838A2; EP3645856A1; DE102017211107A1; CN110832183A; KR20200020734A

Abstract

The invention relates to a water injection device (1) for an internal combustion engine (2) of a motor vehicle, comprising a water tank (5) for storing water, at least one water injector (6) for injecting water into the internal combustion engine (2), a conveying element (3) for conveying water from the water tank (5) to the water injector (6). The conveying element (3) is connected to the water tank (5) by means of a first line (7) and is connected to the water injector (6) by means of a second line (8). According to the invention, deionized water is provided in the water injection device (1) for injecting into the internal combustion chamber (2).

Description

description

title

Water injection device for an internal combustion engine of a motor vehicle

PRIOR ART The invention relates to a water injection device for an internal combustion engine of a motor vehicle having the features of the preamble of independent claim 1.

In order to lower the temperature in a combustion process of an internal combustion engine of a motor vehicle and thus to a fuel consumption of the

To reduce internal combustion engine and to improve an emission behavior of the internal combustion engine, water can enter a suction pipe or a combustion chamber of the

Internal combustion engine to be injected. In such water injection systems, a water tank is normally provided, so that at any time water for injection into the intake manifold or the combustion chamber of the internal combustion engine is available. In addition, in such Wassereinspirtzsystemen water by means of a

Water extraction system can be obtained for example from the exhaust system of the internal combustion engine in the motor vehicle or from the environment of the motor vehicle and, for example, the water tank are supplied. For example, DE 10 2015 208 476 A1 discloses a water injection system for an internal combustion engine.

Disclosure of the invention

According to the invention, a water injection device for an internal combustion engine of a motor vehicle is proposed. The water injection device comprises a water tank for storing water, at least one water injector for

Injecting water into the internal combustion engine, a conveying element for conveying the water from the water tank to the water injector, wherein the conveying element via a first line to the water tank and via a second line with the Water injector is connected. According to the invention, deionized water is provided in the water injection device for injection into the internal combustion engine.

Advantages of the invention

Compared to the prior art, the water injection device with the

Features of independent claim 1 have the advantage that in the exclusive use of deionized water in contrast to the use of

conventional tap water the corrosive properties of conventional

Tap water can be excluded. Furthermore, an operating medium is defined with deionized water, which is globally available in defined quality and / or easily produced in the required quality, for example by means of mixed bed exchanger and thus is not subject to the worldwide quality fluctuations of tap water. As a result, system complexity and component complexity as well as the necessary depth of testing can be significantly reduced. The quality of deionized water can be advantageously measured by the conductivity of the deionized water, whereby the quality of the deionized water is advantageously evaluated and comparable. Thus, the detection of a deviating from a specification water quality can be advantageously determined. Thus, for example, a

Misfuelling by means of tap water due to the increased conductivity in contrast to deionized water detected and / or excluded. The deionized water of sufficient quality, for example, can advantageously be achieved simply by the use of ion exchangers, for example mixed-bed exchangers, or by

Reverse osmosis or distillation can be made.

Further advantageous embodiments and further developments of the inventions are made possible by the features specified in the subclaims. In an advantageous embodiment, the water injection device comprises at least one water quality detection device for detecting a

Water quality of deionized water provided in the water injection device. By the water quality detecting means for detecting the

Water quality can be advantageously detected the water quality of the deionized water and thus, for example, a misfuelling of the water injection system Furthermore, it can be made possible by monitoring the water quality by the water quality detection device, for example, a misuse detection, for example, intentional refueling with fuels.

Advantageously, the water quality detection device is designed as a conductivity sensor for detecting the conductivity of the deionized water. The measurement of the conductivity of deionized water to detect the water quality of the

deionized water represents a simple and safe method. Particularly advantageous, the conductivity can be measured via a conductivity sensor.

In an advantageous embodiment, the water quality detection device is arranged in the water tank. With a water quality detection device arranged in this way, the water quality can advantageously be determined easily and simply directly in the region in which the water is stored, the water tank. By means of a water quality detection device arranged in this way, the water quality of the deionized water can be monitored particularly well and a misuse detection, ie intentional refueling of the water tank, for example with fuel, can advantageously be detected well and directly in the water tank.

In an advantageous embodiment, the water quality detection device is arranged in the first line or in the second line.

Particularly advantageously, the deionized water has a conductivity of less than 30 microsiemens per centimeter, in particular less than 10 microsiemens per

Zentimeterauf. Deionized water with such a conductivity is characterized by advantageously low corrosive properties, by the components of

Water injection device can be damaged, so that the components of the water injection device are protected against corrosion caused by the water advantageous.

Advantageously, the water injection device comprises a control unit which is adapted to control the water injection device depending on the conductivity of the deionized water. For example, the water injection can advantageous to the water quality of the deionized water, which is characterized for example by the conductivity of the deionized water, adapted.

In an advantageous embodiment, the control unit is configured to switch off the water injection through the water injection device when the

Conductivity exceeds a limit. Thus, the water injection device can be advantageously protected from damage, for example by corrosive properties of the water provided in the water injection device.

Brief description of the drawings

Embodiments of the invention is illustrated in the drawing and are explained in more detail in the following description. Show it

1 is a highly simplified schematic view of an internal combustion engine with a water injection device according to a first embodiment of the present invention,

2 is a simplified schematic view of the water injection device according to the first embodiment,

3 is a simplified schematic view of the water injection device according to a second embodiment,

4 is a simplified schematic view of the water injection device according to a third embodiment.

Embodiments of the invention

Hereinafter, with reference to Figures 1 to 4 a

Water injection device 1 for injecting water of an internal combustion engine 2 described in detail. In particular, the internal combustion engine 2 is operated according to the Otto principle and with gasoline direct injection.

In Figure 1, the internal combustion engine 2 is shown schematically, which has a plurality of cylinders. The internal combustion engine 2 comprises a combustion chamber 20 per cylinder, in which a piston 21 is movable back and forth. Furthermore, the internal combustion engine 2 preferably has two inlet valves 25 per cylinder, each having an inlet channel 22, via which air is supplied to the combustion chamber 20. Exhaust gas is discharged via an outlet channel 23. For this purpose, an outlet valve 26 is arranged on the outlet channel 23.

At each inlet channel 22, a water injector 6 is further arranged, which injects water via a control unit 10 in the direction of a valve element 28 of the inlet valve 25 of the internal combustion engine 2. The water can be injected as in this embodiment, for example, in the intake section 22, so for example in the intake manifold or the inlet channel. The water can be injected via the water injectors 6 but, for example, directly into the combustion chamber 20 of the internal combustion engine 2. In this exemplary embodiment, two water injectors 6 per cylinder are provided for better treatment or to increase the maximum injectable amount of water per combustion cycle.

In Fig. 2, the device 1 according to the invention for the injection of water for an internal combustion engine 2 of a motor vehicle is shown in detail. The

Water injection device 1 comprises a pumping element designed as a pump 3 and an electric drive 4 for driving the conveying element 3. Furthermore, a water tank 5 is provided, which is connected by a first line 7 with the conveying element 3. The water tank 5 is provided for storing water. A second line 8 connects the conveying element 3 with a distributor 9 or a rail, to which a plurality of water injectors 6 is connected. So that's it

Conveying element 3 is connected via the second line 8 with the water injector in 6. The conveying element 3 is for conveying the water from the water tank 5 to the

Water injectors 6 are provided. The water injectors 6 are provided for injecting water into the internal combustion engine 2.

For injecting water into the inlet ducts 22 of the engine 2, water is supplied from the water tank 5 through the conveying member 3 into the water injectors 6. Water can be conveyed via a refill line 12 into the water tank 5. In the refill line 12 may optionally be provided a sieve. Further, a prefilter 16 may be disposed in the first conduit 7 and a fine filter 17 may be disposed in the second conduit 8. If now a water injection is requested via the control unit 10, which is designed in particular as a control unit for an internal combustion engine, water is sucked out of the water tank 5 by means of the conveying element 3.

The requested amount of water is conveyed via the distributor 9 to the water injectors 6 and injected by means of clocking the water injectors 6 in the inlet channel 22.

During operation of the water injection device 1, the conveying element 3 is driven by means of the control unit 10 via the electric drive 4. The

Control unit 10 also opens and closes the water injectors 6. This allows controlled injection of water into the inlet channels 22.

In the water injection device 1, deionized water for injecting into the engine 2 is provided. For measuring and detecting a water quality of the deionized water provided in the water injection device 1, the water injection device 1 in this embodiment comprises a water quality

Detecting device 14. The water quality of the provided in the water injection device 1 deionized water is characterized in particular by a low conductivity of the deionized water. Thus, the deionized water preferably has a conductivity of less than 30 microsiemens per centimeter, more preferably less than 10 microsiemens per centimeter.

For measuring the water quality of the deionized water provided in the water injection device 1, the water quality detection device 14 is, for example, a conductivity sensor for detecting the conductivity of deionized water

educated.

In the first exemplary embodiment of the water injection device 1 illustrated in FIG. 2, the water quality detection device 14 is arranged in the water tank 5. In this case, the water quality detection device 14, for example as

Conductive sensor may be formed, for example, at least partially with Water-filled water tank 5 at least partially wetted by water and thus can measure the water quality of the water in the water tank 5 and thus the water quality of the water provided in the water injection device 1. However, the water quality detecting means 14 may be provided in other parts of the water injection device 1, for example. Thus, for example, as shown in FIG. 3, it can be arranged in the first conduit 7 between the water tank 5 and the conveying element 3. However, it can also be arranged, for example, as shown in FIG. 4, in the second line 8 between the conveying element 3 and the distributor 9 or at other points in the water injection device 1.

In the embodiments illustrated in FIGS. 2 to 4, the water quality detection device 14 is connected to the control unit 10, so that the

Water injection device, for example, depending on the water quality of the provided in the water injection device 1 deionized water, so for example, depending on the conductivity of the deionized water, can be controlled. For example, the control unit 10 may be configured such that the

Water injection by the water injection device 1 is turned off when the conductivity of the deionized water exceeds a predetermined limit. The predetermined limit of the conductivity of the deionized water can

for example, be a conductivity of 30 microsiemens per centimeter, in particular of 10 microsiemens per centimeter.

Of course, other embodiments and hybrid forms of the illustrated embodiments are possible.

Claims

claims

1 . Water injection device (1) for an internal combustion engine of a motor vehicle, comprising

a water tank (5) for storing water,

at least one water injector (6) for injecting water into the water

Internal combustion engine (2),

a conveying element (3) for conveying the water from the water tank (5) to the water injector (6), wherein the conveying element (3) via a first line (7) with the water tank (5) and via a second line (8) Water injector (6) is connected, characterized in that in the water injection device (1) deionized water for injection into the internal combustion engine (2) is provided.

A water injection device according to claim 1, characterized in that the water intake means (1) comprises at least one water quality detecting means (14) for detecting a water quality of deionized water provided in the water injection device (1).

3. Water injection device according to claim 2, characterized in that the water quality detection device (14) is designed as a conductivity sensor for detecting the conductivity of the deionized water.

4. Water injection device according to one of claims 2 or 3, characterized

characterized in that the water quality detecting means (14) is disposed in the water tank (5).

5. Water injection device according to one of claims 2 or 3, characterized

in that the water quality detection device (14) is arranged in the first line (7) or in the second line (8).

6. Water injection device according to one of the preceding claims, characterized in that the deionized water has a conductivity of less than 30 microsiemens per centimeter, in particular less than 10 microsiemens per centimeter.

A water injection device according to any one of the preceding claims, characterized in that the water injection device (1) comprises a control unit (10) adapted to control the water injection device (1) depending on the conductivity of the deionized water.

8. Water injection device according to claim 7, characterized in that the control unit (10) is adapted to the water injection through the

Turn off water injector (1) when the conductivity exceeds a limit.