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US 6,474,295 B2Granted
Monovalve with integrated fuel injector and port control valve, and engine using same
AssigneeCaterpillar Inc.
InventorDavid M. Milam
Life of this patent
Estimating the term…
Abstract
Each cylinder of an internal combustion engine includes a combined gas exchange valve and fuel injector with a port control valve. The port control valve operates to open either an intake passage or an exhaust passage. The operation of the combined device is controlled by a pair of electrical actuators. The device is hydraulically actuated.
Claims8
An electronically controlled device comprising:
- a body;
- a port control valve member moveably positioned in said body;
- a gas exchange valve member;
- a fuel injector having a direct control needle valve and being at least partially disposed in said gas exchange valve member;
- a first electrical actuator operably coupled to said direct control needle valve;
- and
- a second electrical actuator operably coupled to said gas exchange valve member and said port control valve member.
4 more elements
A valve comprising:
- a valve body defining a first passage and a control passage;
- a valve member having a first hydraulic surface, a control hydraulic surface and a second surface, and being positioned in said valve body and being moveable between an up position and a down position;
- said first hydraulic surface being exposed to fluid pressure in said first passage when said valve member is in said down position, but only a portion of said first hydraulic surface being exposed to fluid pressure in said first passage when said valve member is in said up position;
- said control hydraulic surface being exposed to fluid pressure in said control passage;
- a source of low pressure fluid;
- a source of high pressure fluid;
- a biaser in contact with said second surface;
- said valve member being biased toward said down position when said valve member is in said down position and said first passage is fluidly connected to said source of high pressure fluid;
- said valve member being biased toward said down position when said valve member is in said up position, said first passage is fluidly connected to said source of high pressure fluid and said control passage is fluidly connected to said source of high pressure fluid;
- and
- said valve member being biased toward said up position when said valve member is in said up position, said first passage is fluidly connected to said source of high pressure fluid and said control passage is fluidly connected to said source of low pressure fluid.
8 more elements
Dependencies are inferred from the claim text.