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US 2019/0293028 A1Published application
High pressure fuel pump and lpdi system including the same
AssigneeMotonic Corporation
InventorsWAN JAE JEON, JUN HYEOK LEE, YONG DEOK PARK, DAE YONG KIM, SEUNG JIN PARK
Life of this patent
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Abstract
Provided is a high pressure fuel pump that smoothly achieves fuel supply while running and quickly relieves vapor generated during a restart by a piston operation of a high pressure fuel pump to improve a startup delay phenomenon, and an LPDI system including the same.
Claims8
A high pressure fuel pump comprising:
- a body formed at one side thereof with a suction hole into which a fuel is supplied from a fuel bombe;
- a pressurizing device coupled to the body to form a high pressure portion such that a part of the fuel is pressurized in the high pressure portion;
- a discharge hole for discharging the part of the fuel pressurized by the pressurizing device;
- and
- a recovery hole for delivering a residual fuel, except for the part of the fuel pressurized by the pressurizing device, introduced through the suction hole to a fuel recovery line connected to the fuel bombe,
- wherein the body comprises:
- a low pressure portion serving as a movement path formed in the body to deliver the residual fuel from the suction hole to the recovery hole;
- and
- a micro-pipe portion formed between the high pressure portion and the low pressure portion for discharging a gaseous fuel in the high pressure portion to the low pressure portion.
6 more elements
A liquid petroleum direct inject (LPDI) system comprising:
- a fuel pump for pumping a fuel stored inside a fuel bombe to supply the fuel toward an engine;
- a high pressure fuel pump that receives the fuel supplied by the fuel pump through a suction hole formed in a body, pressurizes a part of the fuel to a high pressure in a high pressure portion formed inside the body, and delivers a residual fuel, except for the pressurized fuel, to a fuel recovery line through a recovery hole communicating with a low pressure portion such that the residual fuel is recovered to the fuel bombe;
- a delivery pipe connected to a discharge hole of the high pressure fuel pump through which the pressurized fuel is discharged, in which the pressurized fuel is filled in the delivery pipe;
- an injector for directly injecting the fuel filled in the delivery pipe into a combustion chamber of the engine;
- an electronic control portion for generating a control signal for controlling operations of a motor and an injector in the fuel pump and a valve in the high pressure fuel pump based on a target RPM of the engine;
- and
- a motor controller for controlling driving of the motor in accordance with the control signal,
- wherein the body of the high pressure fuel pump is provided with a micro-pipe portion that allows the high pressure portion to communicate with the low pressure portion.
5 more elements
Dependencies are inferred from the claim text.