Water injection device of an internal combustion engine

Abstract

The invention relates to a water injection device of an internal combustion engine, comprising a water tank (5) for storing water, a pump (3) for pumping the water, said pump (3) being arranged higherthan the water tank (5) and being connected to the water tank via a first line (7), a water injection valve (6) for injecting water, said valve being connected to the pump (3) via a second line (8),a drive (4) for driving the pump (3), and a control unit (10) which is designed to open the water injection valve (6) in order to suction water out of the water tank (5) to the pump (3) using a vacuumpresent in front of the water injection valve (6) when the lines and the pump are empty.

Description

technical field

[0001] The invention relates to a water injection system for an internal combustion engine and to an internal combustion engine of this type. Background technique

[0002] It is known in internal combustion engines to achieve an increase in power and / or a reduction in consumption by means of water injection. Here, there is usually a separate water injection system in order to achieve the water injection. Here, the problem area is that the water system can freeze, especially if the vehicle is parked. Here, there is the risk that components of the water system will be damaged by the frozen water.

[0003] A water spray system is known from FR 2339061 in which water is sprayed directly into the suction pipe by means of a spray pump in the absence of a spray valve. Here, in the parked state, water remains in the jet pump and water lines. However, uncontrollable jet pumps as known from this document are not suitable for spraying water accurately in order to in...

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