Device for regulating transport pressure of pump, for instance supplying oil to IC engine

A technology for delivering pressure, internal combustion engine, applied in the direction of fuel injection device, valve operation/release device, valve device, etc., which can solve problems such as surge in disturbance

Inactive Publication Date: 2004-03-03
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The electromagnet is controlled by an electric pulse with a given frequency, which adopts pulse width modulation (PWM) technology, which will also cause disturbance in the oil pressure of the common oil pipe; moreover, since the solenoid valve has a given resonance frequency, at a certain Under the condition of , the result of various forms of disturbance will produce resonance phenomenon that leads to a huge increase in disturbance

Method used

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  • Device for regulating transport pressure of pump, for instance supplying oil to IC engine
  • Device for regulating transport pressure of pump, for instance supplying oil to IC engine
  • Device for regulating transport pressure of pump, for instance supplying oil to IC engine

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Embodiment Construction

[0023] Reference numeral 10 in FIG. 1 generally designates a fuel supply system for an internal combustion engine, such as a diesel engine. The system 10 comprises a low pressure pump 11 driven by an electric motor 12 to supply fuel from a fuel tank of a conventional vehicle to an inlet line 14 of a high pressure pump, generally indicated at 16 .

[0024] The pump 16 is a radial piston type pump provided on the internal combustion engine. More precisely, the pump 16 comprises three cylinders 17 (only one shown in the figure) radially spaced 120° apart on a pump body 18; each cylinder 17 is closed by a disc 19, which supports An oil inlet valve 21 and an oil delivery valve 22 ; each cylinder 17 and its respective disc 19 is locked to the pump body 18 through the corresponding head 23 of the cylinder 17 .

[0025] Three plungers 24 slide in respective cylinders 17 and are sequentially actuated by a cam (not shown in FIG. 1 ) supported by a shaft 25 driven by the drive shaft of ...

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Abstract

The device includes a solenoid valve (32) having a supply conduit (34) communicating with the delivery of the pump (16), a drain conduit, an electromagnet (46) energizable to control an armature (51) controlling a shutter (44), and reducing means for reducing disturbance in the delivery pressure of the pump (16) when the electromagnet (46) is energized. The reducing means include a chamber (64) having a predetermined volume and located between the supply conduit (34) and the drain conduit; and a fixed shield (91c) having an opening (92) in which slides a small-diameter portion (87) of the stem (52) of the armature (51). The electromagnet (46) is controlled by an electronic unit (31) via a modulator (86) for modulating the duty cycle of the control pulses, and via a circuit (103) for selecting the frequency of the control pulses on the basis of an estimate of hydraulic disturbances depending on at least one operating parameter.

Description

[0001] This application is an invention titled "Used to Regulate a For example, a device for delivering pressure to a pump that supplies oil to an internal combustion engine", the divisional application of the invention patent application with application number 00121999.5. technical field [0002] The invention relates to a device for regulating the delivery pressure of a pump, for example for supplying fuel to an internal combustion engine. Background technique [0003] In a modern engine fuel supply system, a low-pressure pump draws fuel from a tank and supplies it to a high-pressure pump, which in turn supplies fuel to a distributor or so-called "spout" for feeding the engine cylinder injectors. public tubing". To control and maintain a constant oil pressure in the common fuel line, some pressure sensor control is usually provided to drain any excess fuel back to the tank. [0004] The known pressure control device usually includes a solenoid valve, and the solenoid va...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M37/00F02M51/00F02M51/04F02M55/02F02M59/36F02M59/46F02M63/00F02M63/02F04B49/24F16K31/06
CPCF02M59/366F02M63/0015F02M63/004F02M63/0052F02M63/0042F02M63/0245F04B49/24F02M63/0225F02M63/0043F02D2041/2027F02M51/04
Inventor 尼古拉·帕库奇西斯托·L·德马萨伊斯
Owner ROBERT BOSCH GMBH
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