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US 5,669,334 AGranted
Injection valves for liquid-fuel mixtures and associated processes
AssigneeMTU Motoren- und Turbinen-Union Friedrichshafen GmbH
InventorsDieter Schonfeld, Bernhard Bachle, Martin Freitag, Torsten Guth
Life of this patent
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Abstract
Injection system for the intermittent introduction of a fuel-liquid mixture into the combustion spaces of an internal-combustion engine with a common-rail pressure reservoir. Lines (16, 30) lead to control spaces (15, 22) of control valves (1). Control space (15) is joined selectively with the common-rail pressure reservoir or a line (18) with a pressure p0 or a line with a pressure p1 for control of injection quantities of the fuel-liquid mixture. Control space (22) is joined selectively to the common-rail pressure reservoir or to a line with pressure p2 or to a line (33) with pressure p0 for control of the liquid fraction of the injection quantity.
Claims30
An injection system for intermittent introduction of a fuel-liquid mixture into a combustion space of an internal combustion engine, said injection system comprising:
- a first high pressure line,
- a first low pressure line, and an
- injection valve,
- said injection valve comprising:
- a housing having an injection opening for communication with a combustion space of an internal combustion engine,
- a valve member displaceable in said housing to open and close said injection opening,
- said valve member and said housing defining a first control space,
- means for selectively and intermittently connecting said first control space to said first high pressure line or said first low pressure line to pressurize said valve member and enable the valve member to be displaced to close and open said injection opening,
- means for supply of fuel and liquid into said housing in a region communicating with said injection opening,
- a second high pressure line,
- a second low pressure line,
- a second control space
- means for selectively and intermittently connecting said second control space to said second high pressure line and said second low pressure line and
- a piston supported for undergoing relative displacement with respect to said valve member depending on the pressure in said second control space to increase the volume of said region by a determined amount so that liquid is introduced into said region in an amount which is a function of said increase in volume.
11 more elements
An injection system for intermittent introduction of a fuel-liquid mixture into a combustion space of an internal combustion engine, said injection system comprising:
- a first high pressure line,
- a first low pressure line, and an injection valve, said injection valve comprising:
- a housing having an injection opening for communication with a combustion space of an internal combustion engine,
- a valve member displaceable in said housing to open and close said injection opening,
- said valve member and said housing defining a first control space,
- means for selectively and intermittently connecting said first control space to said first high pressure line or said first low pressure line to pressurize said valve member and enable the valve member to be displaced to close and open said injection opening,
- a fuel line connected to a high pressure fuel supply, said fuel line opening into a region of said housing adjacent to said injection opening,
- a piston displaceably arranged in coaxially movable manner on said valve member,
- said valve member and said piston defining a second control space,
- means for selectively and intermittently connecting said second control space to a second high pressure line or a second low pressure line, and
- a liquid line for supplying liquid to said region for mixing liquid with fuel for discharge from said injection opening,
- said valve member closing said injection opening when said first control space is connected to said first high pressure line, said piston being movable when said second control space is connected to said second low pressure line to form a volume communicating with said region into which is introduced an amount of liquid as a function of said volume so that when said valve member opens said injection opening fuel will be discharge therefrom with said amount of liquid.
9 more elements
An injection system for intermittent introduction of a fuel-liquid mixture into a combustion space of an internal combustion engine, said injection system comprising:
- A first high pressure line,
- a first low pressure line, and
- an injection valve,
- said injection valve comprising:
- a housing having an injection opening for communication with a combustion space of an internal combustion engine,
- a valve member displaceable in said housing to open and close said injection opening,
- said valve member and said housing defining a first control space, means for selectively and intermittently connecting said first control space to said first high pressure line or said first low pressure line to pressurize said valve member and enable the valve member to be displaced to close and open said injection opening,
- a piston displaceably arranged in coaxially movable manner on said valve member,
- said valve member and said piston defining a second control space,
- means for selectively and intermittently connecting said second control space to a second high pressure line or a second low pressure line, and
- a line for continuously supplying fuel and liquid mixture to a region of said housing communicating with said injection opening,
- said valve member closing said injection opening said amount of liquid and fuel mixture will be discharged when said first control space is connected to said first high pressure line, said piston being movable when said second control space is connected to said second low pressure line to form a volume communicating with said region into which is introduced an amount of liquid and fuel mixture as a function of said volume so that when said valve member opens said injection opening fuel will be discharged therefrom with said amount of liquid and fuel mixture.
9 more elements
An injection system for intermittent introduction of a fuel-liquid mixture into a combustion space of an internal combustion engine, said injection system comprising:
- a first high pressure line,
- a first low pressure line, and an injection valve, said injection valve comprising:
- a first housing having an injection opening for communication with a combustion space of an internal combustion engine,
- a valve member displaceable in said housing to open and close said injection opening,
- said valve member and said housing defining a first control space,
- means for selectively and intermittently connecting said first control space to said first high pressure line or said first low pressure line to pressurize said valve member and enable said valve member to be displaced to close and open said injection opening,
- a fuel line opening into said first housing adjacent to said injection opening,
- a second housing,
- a piston displaceable in said second housing, said piston defining upper and lower control spaces on opposite sides of the piston,
- a second high pressure line,
- a second low pressure line,
- means for selectively connecting said lower control space selectively with said second high and low pressure lines,
- said second housing having a bore in which a shaft of said piston is slidable, said fuel line being connected to said bore,
- a liquid line connected to said first housing to supply liquid therein adjacent to said injection opening, and
- means for producing an incremental volume in said first housing when said injection opening is closed and said fuel line is disconnected from a fuel source so that said liquid is supplied to said first housing in an amount equal to said incremental volume whereby when the injection opening is opened said amount of liquid will be supplied with fuel therefrom.
12 more elements
A process for intermittent introduction of a fuel-liquid mixture into a combustion space of an internal combustion engine, said process comprising:
- providing an injection valve having a housing provided with an injection opening from which fuel and liquid can be supplied to a combustion space of an internal combustion engine,
- intermittently opening and closing said injection opening by a displaceable valve member in said housing,
- forming a region in said housing communicating with said injection opening,
- introducing the fuel and liquid into said region for discharge from said injection valve when said valve member opens said injection opening,
- displacing said valve member in said housing by
- selectively and intermittently connecting a first control space formed between said valve member and said housing to a first high pressure line or a first low pressure line to cause said valve member to intermittently open and close said injection opening, and
- selectively and intermittently connecting a piston to a second high pressure line and a second low pressure line to produce relative movement of said piston with respect to said valve member when said valve member closes said injection opening so that the volume of said region is increased, and
- introducing into said region an amount of said liquid related to the increase of volume of said region produced when said piston undergoes relative movement with respect to said valve member.
5 more elements
Dependencies are inferred from the claim text.