Water supply control apparatus for in-cylinder injection type internal combustion engine (as amended)

Patent metadata

Field	Value
Publication number	US-2016258388-A1
Application number	US-201415032152-A
Country	US
Kind code	A1
Filing date	Nov 6, 2014
Priority date	Nov 8, 2013
Publication date	Sep 8, 2016
Grant date	—

Abstract

A water supply control apparatus is applied to an in-cylinder injection type internal combustion engine ( 1 ) which injects fuel from a central area ( 2 a ) in a cylinder ( 2 ). The water supply control apparatus comprises a condensed water supply mechanism ( 22 ) where a state of supplying condensed water (CW) into the cylinder ( 2 ) is changeable between a first supply state that the condensed water (CW) is supplied to a whole inside of the cylinder ( 2 ) and a second supply state that the condensed water (CW) is limitedly supplied to the central area ( 2 a ) of the cylinder ( 2 ). In the second supply state, the supply amount of condensed water supplied into the cylinder ( 2 ) in the second supply state is less than the supply amount of condensed water supplied into the cylinder ( 2 ) in the first supply state.

First claim

1 . A water supply control apparatus for an in-cylinder injection type internal combustion engine, the water supply control apparatus being applied to the in-cylinder injection type internal combustion engine which injects fuel from a central area in a cylinder, and comprising:
a water supply device where a state of supplying water into the cylinder is changeable between a first supply state that the water is supplied to a whole inside of the cylinder and a second supply state that the water is supplied into the cylinder so that a supply amount of the water supplied to a central area lying in the cylinder is more than a supply amount of the water supplied to a peripheral area lying in the cylinder; and a computer, the computer by executing a computer program, functioning as a control device which is configured to control the water supply device so that the supply amount of the water supplied into the cylinder in a case of the second supply state is less than the supply amount of the water supplied into the cylinder in a case of the first supply state.

2 . The water supply control apparatus according to claim 1 , further comprising a storage tank which stores water, wherein
the control device is configured to control the water supply device so that water is supplied into the cylinder in the second supply state, in a case of an insufficient water state that a storage water quantity in the storage tank is equal to or less than a predetermined quantity.

3 . The water supply control apparatus according to claim 1 , wherein
the water supply device realizes the second supply state by supplying water to the central area lying in the cylinder and also stopping supply of water to the peripheral area lying in the cylinder.

4 . The water supply control apparatus according to claim 1 , comprising as the water supply device
a first intake port which makes intake gas flow into the central area lying in the cylinder; a second intake port which makes intake gas flow into the peripheral area lying in the cylinder; a first supply device which supplies condensed water to the intake gas flowing into the central area of the cylinder; a second supply device which supplies condensed water to at least the second intake port; and a supply change device which is capable of changing the supply amount of water supplied by the first supply device and the supply amount of water supplied by the second supply device.

5 . The water supply control apparatus according to claim 4 , wherein
the first supply device is provided to the first intake port.

6 . The water supply control apparatus according to claim 5 , wherein
the in-cylinder injection type internal combustion engine has an intake passage which divides into the first intake port and the second intake port, and the second supply device is provided to the second intake port lying at a position further downstream than a position where the intake passage divides into the first intake port and the second intake port.

7 . The water supply control apparatus according to claim 4 , wherein
the first supply device is provided so as to face the central area lying in the cylinder.

8 . The water supply control apparatus according to claim 7 , wherein
the in-cylinder injection type internal combustion engine has an intake passage which divides into the first intake port and the second intake port, and the second supply device is provided to the intake passage at a position further upstream than a position where the intake passage divides into the first intake port and the second intake port.

9 . The water supply control apparatus according to claim 1 , wherein
the water is supplied into the cylinder in a high load range of the in-cylinder injection type internal combustion engine.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nishida Kentaro

Classifications

• F02D41/0025

  Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures · CPC title

• F02M25/03 Primary

  into the cylinder {or the pre-combustion chamber} · CPC title

• F02B31/085

  having two inlet valves · CPC title

• F02B17/005

  having direct injection in the combustion chamber · CPC title

• F02M26/35

  with means for cleaning or treating the recirculated gases, e.g. catalysts, condensate traps, particle filters or heaters · CPC title