Gas fuel supply system

Patent metadata

Field	Value
Publication number	US-11466646-B2
Application number	US-202117223199-A
Country	US
Kind code	B2
Filing date	Apr 6, 2021
Priority date	Apr 10, 2020
Publication date	Oct 11, 2022
Grant date	Oct 11, 2022

Abstract

A gas fuel supply system for supplying the gas fuel via an opening of an intake supply pipe that is connected to a combustion chamber in an engine operable in each of a gas fuel combustion mode and an oil fuel combustion mode includes: the gas fuel supply valve for regulating an amount of the gas fuel, the gas fuel supply valve having plural gas supply holes, from which the gas fuel is fed in a direction toward the opening when the valve is opened; and an opening regulation valve provided between the gas fuel supply valve and the opening and having an opening hole, an opening area of which can be regulated. The gas fuel supply system is configured that extended axes of all the gas supply holes pass through the fully opened opening hole.

First claim

What is claimed is:

1. A gas fuel supply system ( 30 ) for supplying gas fuel via an opening ( 24 ) of an intake supply pipe ( 20 ) that is connected to a combustion chamber in an engine ( 10 ) operable in each of a gas fuel combustion mode and an oil fuel combustion mode, the gas fuel supply system ( 30 ) comprising:
a gas fuel supply valve ( 40 ) for regulating the gas fuel, the gas fuel supply valve ( 40 ) having plural gas supply holes ( 54 ), from which the gas fuel is fed in a direction toward the opening ( 24 ) when the valve is opened; and
an opening regulation valve ( 60 ) provided between the gas fuel supply valve ( 40 ) and the opening ( 24 ) and having an opening hole, an opening area of which can be regulated,
wherein the gas fuel supply system ( 30 ) being configured such that extended axes ( 54 C) of all the gas supply holes ( 54 ) pass through the fully opened opening hole.

2. The gas fuel supply system ( 30 ) according to claim 1 , wherein
the opening area of the opening hole can be regulated at least in three stages at a fully closed position, a fully opened position, and a position therebetween.

3. The gas fuel supply system ( 30 ) according to claim 1 , wherein
the opening regulation valve ( 60 ) is any of an iris valve ( 64 ), a slide valve ( 68 ), and a butterfly valve ( 72 ).

4. The gas fuel supply system ( 30 ) according to claim 1 , wherein
the opening regulation valve ( 60 ) cooperates with the gas fuel supply valve ( 40 ) to regulates an amount of the gas fuel to be supplied to the opening ( 24 ).

5. The gas fuel supply system ( 30 ) according to claim 1 , wherein
when the engine ( 10 ) is switched from the gas fuel combustion mode to the oil fuel combustion mode, the gas fuel supply valve ( 40 ) is first closed, and then the opening hole of the opening regulation valve ( 60 ) is fully closed.

6. The gas fuel supply system ( 30 ) according to claim 2 , wherein
the opening regulation valve ( 60 ) is any of an iris valve ( 64 ), a slide valve ( 68 ), and a butterfly valve ( 72 ).

7. The gas fuel supply system ( 30 ) according to claim 6 , wherein
the opening regulation valve ( 60 ) cooperates with the gas fuel supply valve ( 40 ) to regulates an amount of the gas fuel to be supplied to the opening ( 24 ).

8. The gas fuel supply system ( 30 ) according to claim 7 , wherein
when the engine ( 10 ) is switched from the gas fuel combustion mode to the oil fuel combustion mode, the gas fuel supply valve ( 40 ) is first closed, and then the opening hole of the opening regulation valve ( 60 ) is fully closed.

Assignees

• Bosch Gmbh Robert

Inventors

• Kanoto Yoshihiko

Classifications

• F02M21/023 Primary

  Valves; Pressure or flow regulators in the fuel supply or return system · CPC title

• F02D19/0642

  at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions · CPC title

• Y02T10/30

  Use of alternative fuels, e.g. biofuels · CPC title

• F02D19/0613

  Switch-over from one fuel to another (F02D19/081 takes precedence) · CPC title

• F02M21/0242

  Shut-off valves; Check valves; Safety valves; Pressure relief valves · CPC title