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Water injection device of an internal combustion engine

A water injection, internal combustion engine technology, applied to internal combustion piston engines, combustion engines, charging systems, etc., can solve problems such as peak exhaust gas temperature knocking, and achieve the effect of avoiding wall wetting

Inactive Publication Date: 2020-02-11
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to this delayed start-up, temperature peaks in the exhaust gas and knocking situations in the combustion can occur during rapid load changes

Method used

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  • Water injection device of an internal combustion engine
  • Water injection device of an internal combustion engine
  • Water injection device of an internal combustion engine

Examples

Experimental program
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Embodiment Construction

[0024] Refer below figure 1 and 2 The water injection system 1 of the internal combustion engine 2 will be described in detail based on the first exemplary embodiment. The internal combustion engine 2 is operated in particular according to the Otto principle and with direct gasoline injection.

[0025] exist figure 1 2 schematically shows an internal combustion engine 2 with a plurality of cylinders and a part of the water injection system 1 according to the invention. Each cylinder of the internal combustion engine 2 includes a combustion chamber 20 in which a piston 21 can reciprocate. Furthermore, each cylinder of the internal combustion engine 2 has an intake duct 22 via which air is supplied to the combustion chamber 20 . Exhaust gas is discharged via the exhaust passage 23 . For this purpose, an intake valve 25 is arranged on the intake passage 22 and an exhaust valve 26 is arranged on the exhaust passage 23 . Furthermore, reference numeral 24 designates a fuel inj...

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Abstract

The invention relates to a water injection device for an internal combustion engine (2), the water injection device comprising a water tank (5) for storing water, at least one water injector (6) for injecting the water into the internal combustion engine (2), and at least one conveying element (3) for conveying water from the water tank (5) into the water injector (6). According to the invention,the water injection device (1) also comprises a shut-off element (11) which is arranged between the water tank (5) and the conveying element (3) and which is designed to maintain a system pressure ata level between the shut-off element (11) and the water injector (6) in order to prevent the water evaporating between the water tank (5) and the conveying element (3).

Description

technical field [0001] The invention relates to a water injection system for an internal combustion engine and to such an internal combustion engine. Background technique [0002] Due to the increasing demands on reducing CO2 emissions, internal combustion engines are increasingly optimized with regard to fuel consumption. However, the known internal combustion engines cannot be operated optimally with regard to consumption at operating points with high loads, since the operation is limited by the tendency to knock and the high exhaust gas temperature. One possible measure for reducing the tendency to knock and for lowering the temperature of the exhaust gas is water injection. Here, a separate water injection system is usually present in order to be able to implement the water injection. Thus, a water injection system for an internal combustion engine is known, for example, from DE 10 2015 208 476 A1. [0003] In water injection systems for internal combustion engines, a...

Claims

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Application Information

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IPC IPC(8): F02M25/022F02M25/028
CPCF02M25/0221F02M25/0222F02M25/0227F02M25/025F02M25/028Y02T10/12F02M25/0225
Inventor P·格拉代尔I·布拉克P·申克
Owner ROBERT BOSCH GMBH
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