WO2006060545A1 - Reduced noise solenoid controlled fuel pump - Google Patents

Reduced noise solenoid controlled fuel pump Download PDF

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Publication number
WO2006060545A1
WO2006060545A1 PCT/US2005/043422 US2005043422W WO2006060545A1 WO 2006060545 A1 WO2006060545 A1 WO 2006060545A1 US 2005043422 W US2005043422 W US 2005043422W WO 2006060545 A1 WO2006060545 A1 WO 2006060545A1
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WO
WIPO (PCT)
Prior art keywords
fuel
pulse
spill
fuel pump
pump
Prior art date
Application number
PCT/US2005/043422
Other languages
French (fr)
Other versions
WO2006060545A9 (en
Inventor
Robert Gerald Lucas
Philip John Blaze
Original Assignee
Stanadyne Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stanadyne Corporation filed Critical Stanadyne Corporation
Publication of WO2006060545A1 publication Critical patent/WO2006060545A1/en
Publication of WO2006060545A9 publication Critical patent/WO2006060545A9/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type
    • F02D41/3809—Common rail control systems
    • F02D41/3836—Controlling the fuel pressure
    • F02D41/3845—Controlling the fuel pressure by controlling the flow into the common rail, e.g. the amount of fuel pumped
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
    • F02M59/20—Varying fuel delivery in quantity or timing
    • F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
    • F02M59/366—Valves being actuated electrically
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2024—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit the control switching a load after time-on and time-off pulses
    • F02D2041/2027—Control of the current by pulse width modulation or duty cycle control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2034—Control of the current gradient
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2037—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit for preventing bouncing of the valve needle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/20—Output circuits, e.g. for controlling currents in command coils
    • F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
    • F02D2041/2044—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using pre-magnetisation or post-magnetisation of the coils
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/04—Fuel-injection apparatus having means for avoiding effect of cavitation, e.g. erosion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/09—Fuel-injection apparatus having means for reducing noise
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/31—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements
    • F02M2200/315—Fuel-injection apparatus having hydraulic pressure fluctuations damping elements for damping fuel pressure fluctuations

Definitions

  • the present invention is directed to a high pressure fuel pump of the type used with vehicle engines, especially a demand controlled pump for delivering fuel to a common rail fuel injection system.
  • High speed on/off type solenoid actuated valves are often used to control pump fuel delivery and/or fuel system rail pressure for common rail pumps and rotary distributor type pumps.
  • a common problem or complaint associated with these pump types are audible and hydraulic noise associated with the rapid spilling of high pressure and/or solenoid and valve impact.
  • the hydraulic noise is caused by the sudden spilling of a high pressure into a low pressure.
  • the audible noise is caused by this hydraulic noise as well as mechanical noise when the valve and/or solenoid armature suddenly hits its mechanical stop during opening and/or closing.
  • the power pulse for energizing (or deenergizing) the solenoid is modified to slow the force versus time profile acting on the solenoid valve during the transition between on and off or off and on.
  • This control scheme reduces the hydraulic and mechanical noise by reducing the valve's spill rate and / or impact velocity. Added benefits are reduced component wear and cavitation. Additionally, this control scheme can be switched to a more traditional square wave on/off type at higher speeds and duty cycles (when noise is less of an issue) in order to meet fuel delivery requirements if necessary.
  • Figs. 1A is a typical square wave control pulse of positive polarity
  • Figs 1 B -1 D depict square wave control pulses modified according to various embodiments of the present invention
  • Figs. 1 E-1G depict drive current profiles according to other embodiments of the present invention.
  • Fig. 2 is a schematic of a typical rail fuel delivery system incorporating an embodiment of the present invention.
  • Fig. 3 is a schematic of a high pressure radial piston pump incorporating an embodiment of the present invention.
  • Fig. 4 is a schematic that shows use of an active switching device that can selectively recirculate current in order to slow the decay rate during solenoid de-energizing.
  • a typical control pulse 10 is characterized by a positive square wave having a starting or leading edge 11 , a nominal pulse width 12, and an ending or trailing edge 13.
  • Figure 1 B depicts a period of pulse width modulation (PWM) or PWM burst 14 added to the end of each typical square wave control pulse 12'.
  • PWM pulse width modulation
  • This execution would slow the release time of a normally open electrically controlled solenoid actuated valve.
  • PWM burst 14 is triggered by the ending edge 13' of the normal control pulse 12', begins after a specified delay period 15, and continues for a specified number of pulses at a set frequency and duty cycle.
  • a PWM burst 14' can occur before the normal control pulse 12' as shown in Figure 1C, or PWM bursts 14, 14' can both precede and follow the normal control pulse 12' as shown in Figure 1D.
  • Alternative embodiments of the present invention include modulation of the pulse count, frequency and duty cycle during the release or closure event. Although positive voltage control pulses are shown, the invention applies equally well to the modification of negative voltage pulses.
  • a nominal voltage pulse would be in the form of a square wave
  • the associated current would rise and fall with modest, non-instantaneous slopes
  • the associated armature force (motion) of the solenoid valve would likewise exhibit modest rise and fall slopes.
  • the present invention modifies the electronic control pulse relative to nominal, to "soften” the resulting force vs. time profile acting on the armature, e.g, by prolonging or extending the rising or falling slope of the voltage or current control pulse.
  • the nominal control pulse need not be a square wave; whatever the nominal shape, the inventive technique modifies it for softening the driving force on the armature.
  • a nominal pulse can have a liner (non-instantaneous) rise, a constant peak amplitude, followed by linear fall, whereas the modified pulse can be bell- shaped.
  • Other methods of controlling the current decay or current rise, as depicted in Figures 1 E-1G, that fall within the purview of the present invention include direct current control via linear voltage, control of a current chopper driver, and control of current decay by selectively recirculating current during de-energizing, such as through the use of an active switching device.
  • Figures 2 and 3 illustrate various embodiments of the present invention as incorporated into a common rail fuel supply system and a high- pressure radial piston pump.
  • Figure 2 depicts a fuel supply system having the basic components of: an in-tank (low pressure) supply pump 20, a fuel filter 21 , and a high pressure pump 22, (shown in broken lines for clarity).
  • Pump 22 maintains a high operating pressure in a common rail 23 that is in fluid connection to a plurality of fuel injector nozzles 24.
  • Each fuel injector nozzle 24 is situated to inject fuel according to the timing sequence controlled by the electronic control unit 25.
  • Solenoid valve 26, which incorporates the control scheme of the present invention, is located within the high pressure pump 22.
  • Valve control pulse generator 27 provides the control pulse for solenoid valve 26.
  • the pressure of the rail is monitored by rail pressure sensor 28.
  • Other features of this embodiment of a fuel supply system include pressure relief valve 29, which is fluidly connected to oneway check valve 30.
  • a fuel pump having at least one pumping plunger or piston 31 mounted for reciprocation in a respective pumping bore is associated with a pumping chamber whereby fuel at a low inlet pressure is fed to the pumping bore during a charging stroke of the plunger within the bore and the fed fuel is pressurized in the pumping chamber during a discharging stroke of the plunger within the bore.
  • a pressurized quantity of fuel from a plurality of pumping chambers is discharged to a common discharge line 32 that is connected to the pump outlet for delivery to the external common rail 24.
  • a spill control system whereby while the fuel is pressurized in the pumping chamber or discharge line, a solenoid operated binary spill valve 33 opens a spill path to divert some of the pressurized fuel in the pumping chamber or in the discharge line 32, to a low pressure sump, such as the feed line 34 or the pump housing.
  • a solenoid operated binary spill valve 33 opens a spill path to divert some of the pressurized fuel in the pumping chamber or in the discharge line 32, to a low pressure sump, such as the feed line 34 or the pump housing.
  • the quantity of pressurized fuel that is delivered outside the pump e.g., enters the common rail
  • the valve then closes the spill path to restore the discharge to the common rail 24.
  • the timing of the energizing and de- energizing of the spill valve 33 is directed by the valve control pulse generator 27 (shown in Figure 2) according to demand control programming such as described in the patents listed above.
  • the improvement in the embodiments depicted in Figures 2 and 3 comprises electronically softening the start and/or end of the energizing and/or de-energizing power pulse and resulting current to the solenoid, such as shown in Figures 1 B thru 1G.
  • the discharge from a plurality of pumping chambers can be delivered to a common discharge line that is fluidly connected to the common rail but has a bypass leg in which the control valve is present.
  • spill controlled distributor type pumps can have a plurality of control valves that operate with a respective plurality of pumping chambers that communicate with a respective plurality of injectors.
  • one control valve can control the output of each of a plurality of sequentially actuated pumping chambers.
  • the pumping plungers can reciprocate with sequential radially outward pumping, according to which each bore has a respective distinct pumping chamber (as in Fig. 3) or in other types of pumps, the plungers pump radially inwardly into a common volume from which a discharge path leads out of the pump to a discharge fitting or the like.
  • Figure 4 illustrates an embodiment of a circuit that actively controls recirculation current via a solenoid control module 64, active switch 60, and a current or voltage sensor 62.
  • switch 60 is a FET or other fast switching mode device.
  • a recirculation current control circuit provides the ability to enable or disable the soft spill mode.
  • recirculation current control also allows for better management of current decay and armature impact.
  • the fast switching/recirculating current cycle occurs at least once per pulse modification, and more preferably, the fast switching/recirculating current cycle occurs at least twice. Other techniques for recirculating current are also within the scope of the present invention. These embodiments would also have similar noise control benefits.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
  • Electromagnetic Pumps, Or The Like (AREA)

Abstract

A high pressure fuel pump with reduced audible and hydraulic noise. The fuel pump incorporates a control scheme that utilizes an electronically controlled on/off type solenoid actuated valve (26, 33) to control pump fuel delivery and/or fuel system rail pressure. The power pulse for energizing or de-energizing the solenoid is selectively modified to slow the force verses time profile acting on the solenoid valve during the on/off and off/on transition.

Description

REDUCEDNOISESOLENOIDCONTROLLEDFUELPUMP
Field of the Invention The present invention is directed to a high pressure fuel pump of the type used with vehicle engines, especially a demand controlled pump for delivering fuel to a common rail fuel injection system.
Background of the Invention Examples of such high pressure fuel pumps and associated fuel supply systems are described in U.S. Patent Nos. 6,637,408, "Common Rail Fuel Supply System With High Pressure Accumulator"; 6,494,182, "Self- Regulating Gasoline Direct Injection System"; 6,694,950, "Hybrid Control Method for Fuel Pump Using Intermittent Recirculation at Low and High Engine Speeds", and 6,422,203, "Variable Output Pump for Gasoline Direct Injection", the disclosures of which are hereby incorporated by reference. At least some of the pumps described in these patents utilize a solenoid controlled valve to selectively redirect pumped fuel to a low pressure sump and thereby bypass the injectors. High speed on/off type solenoid actuated valves are often used to control pump fuel delivery and/or fuel system rail pressure for common rail pumps and rotary distributor type pumps. A common problem or complaint associated with these pump types are audible and hydraulic noise associated with the rapid spilling of high pressure and/or solenoid and valve impact. The hydraulic noise is caused by the sudden spilling of a high pressure into a low pressure. The audible noise is caused by this hydraulic noise as well as mechanical noise when the valve and/or solenoid armature suddenly hits its mechanical stop during opening and/or closing. Summary of the Invention
According to the present invention, instead of a traditional instantaneous switching on or off of the solenoid which results in a rapid response of the armature and control valve, the power pulse for energizing (or deenergizing) the solenoid is modified to slow the force versus time profile acting on the solenoid valve during the transition between on and off or off and on. This control scheme reduces the hydraulic and mechanical noise by reducing the valve's spill rate and / or impact velocity. Added benefits are reduced component wear and cavitation. Additionally, this control scheme can be switched to a more traditional square wave on/off type at higher speeds and duty cycles (when noise is less of an issue) in order to meet fuel delivery requirements if necessary.
Brief Description of the Figures Figs. 1A is a typical square wave control pulse of positive polarity,
Figs 1 B -1 D depict square wave control pulses modified according to various embodiments of the present invention, and Figs. 1 E-1G depict drive current profiles according to other embodiments of the present invention.
Fig. 2 is a schematic of a typical rail fuel delivery system incorporating an embodiment of the present invention.
Fig. 3 is a schematic of a high pressure radial piston pump incorporating an embodiment of the present invention.
Fig. 4 is a schematic that shows use of an active switching device that can selectively recirculate current in order to slow the decay rate during solenoid de-energizing.
Detailed Description
One illustration of the inventive concept is shown in Figures 1A-1G.
As shown in Figure 1A a typical control pulse 10 is characterized by a positive square wave having a starting or leading edge 11 , a nominal pulse width 12, and an ending or trailing edge 13. In accord with an embodiment of the present invention, Figure 1 B depicts a period of pulse width modulation (PWM) or PWM burst 14 added to the end of each typical square wave control pulse 12'. This execution would slow the release time of a normally open electrically controlled solenoid actuated valve. The same operating principle applies to a normally closed electrically controlled solenoid actuated valve. PWM burst 14 is triggered by the ending edge 13' of the normal control pulse 12', begins after a specified delay period 15, and continues for a specified number of pulses at a set frequency and duty cycle.
Alternatively, a PWM burst 14' can occur before the normal control pulse 12' as shown in Figure 1C, or PWM bursts 14, 14' can both precede and follow the normal control pulse 12' as shown in Figure 1D. Alternative embodiments of the present invention include modulation of the pulse count, frequency and duty cycle during the release or closure event. Although positive voltage control pulses are shown, the invention applies equally well to the modification of negative voltage pulses.
It should also be appreciated that typically, a nominal voltage pulse would be in the form of a square wave, the associated current would rise and fall with modest, non-instantaneous slopes, and the associated armature force (motion) of the solenoid valve would likewise exhibit modest rise and fall slopes. The present invention modifies the electronic control pulse relative to nominal, to "soften" the resulting force vs. time profile acting on the armature, e.g, by prolonging or extending the rising or falling slope of the voltage or current control pulse. The nominal control pulse need not be a square wave; whatever the nominal shape, the inventive technique modifies it for softening the driving force on the armature. For example, a nominal pulse can have a liner (non-instantaneous) rise, a constant peak amplitude, followed by linear fall, whereas the modified pulse can be bell- shaped. Other methods of controlling the current decay or current rise, as depicted in Figures 1 E-1G, that fall within the purview of the present invention include direct current control via linear voltage, control of a current chopper driver, and control of current decay by selectively recirculating current during de-energizing, such as through the use of an active switching device.
Figures 2 and 3 illustrate various embodiments of the present invention as incorporated into a common rail fuel supply system and a high- pressure radial piston pump. Figure 2 depicts a fuel supply system having the basic components of: an in-tank (low pressure) supply pump 20, a fuel filter 21 , and a high pressure pump 22, (shown in broken lines for clarity). Pump 22 maintains a high operating pressure in a common rail 23 that is in fluid connection to a plurality of fuel injector nozzles 24. Each fuel injector nozzle 24 is situated to inject fuel according to the timing sequence controlled by the electronic control unit 25. Solenoid valve 26, which incorporates the control scheme of the present invention, is located within the high pressure pump 22. Valve control pulse generator 27 provides the control pulse for solenoid valve 26. The pressure of the rail is monitored by rail pressure sensor 28. Other features of this embodiment of a fuel supply system include pressure relief valve 29, which is fluidly connected to oneway check valve 30.
As shown in Figure 3, a fuel pump having at least one pumping plunger or piston 31 mounted for reciprocation in a respective pumping bore is associated with a pumping chamber whereby fuel at a low inlet pressure is fed to the pumping bore during a charging stroke of the plunger within the bore and the fed fuel is pressurized in the pumping chamber during a discharging stroke of the plunger within the bore. In the embodiment illustrated in Figure 3, a pressurized quantity of fuel from a plurality of pumping chambers is discharged to a common discharge line 32 that is connected to the pump outlet for delivery to the external common rail 24. A spill control system is provided whereby while the fuel is pressurized in the pumping chamber or discharge line, a solenoid operated binary spill valve 33 opens a spill path to divert some of the pressurized fuel in the pumping chamber or in the discharge line 32, to a low pressure sump, such as the feed line 34 or the pump housing. As a result, the quantity of pressurized fuel that is delivered outside the pump (e.g., enters the common rail) is less than the quantity of fuel fed to the pumping bore or bores during the charging stroke or strokes. The valve then closes the spill path to restore the discharge to the common rail 24. The timing of the energizing and de- energizing of the spill valve 33 is directed by the valve control pulse generator 27 (shown in Figure 2) according to demand control programming such as described in the patents listed above. The improvement in the embodiments depicted in Figures 2 and 3 comprises electronically softening the start and/or end of the energizing and/or de-energizing power pulse and resulting current to the solenoid, such as shown in Figures 1 B thru 1G.
Thus, the discharge from a plurality of pumping chambers can be delivered to a common discharge line that is fluidly connected to the common rail but has a bypass leg in which the control valve is present. In other contexts (not shown), spill controlled distributor type pumps can have a plurality of control valves that operate with a respective plurality of pumping chambers that communicate with a respective plurality of injectors. Depending on the particular configuration, it is possible that one control valve can control the output of each of a plurality of sequentially actuated pumping chambers. The pumping plungers can reciprocate with sequential radially outward pumping, according to which each bore has a respective distinct pumping chamber (as in Fig. 3) or in other types of pumps, the plungers pump radially inwardly into a common volume from which a discharge path leads out of the pump to a discharge fitting or the like.
Figure 4 illustrates an embodiment of a circuit that actively controls recirculation current via a solenoid control module 64, active switch 60, and a current or voltage sensor 62. Preferably, switch 60 is a FET or other fast switching mode device. A recirculation current control circuit provides the ability to enable or disable the soft spill mode. Moreover, recirculation current control also allows for better management of current decay and armature impact. Finally, it is preferred that the fast switching/recirculating current cycle occurs at least once per pulse modification, and more preferably, the fast switching/recirculating current cycle occurs at least twice. Other techniques for recirculating current are also within the scope of the present invention. These embodiments would also have similar noise control benefits.

Claims

Claims
1. A high pressure fuel pump, wherein a solenoid controlled valve (26) opens and closes a path for the flow of fuel, characterized by a control pulse for energizing or de-energizing the solenoid that is modified to slow the force versus time profile acting on the valve.
2. The fuel pump of claim 1 , characterized by a control pulse having a nominal pulse width (12') and a period of pulse width modulation (14,14') at the start (11 ,11') and/or end (13, 13') of the nominal pulse.
3. The fuel pump of claim 1 , characterized by a control pulse that is essentially a square wave of a predetermined amplitude together with a series of pulse width modulations consisting of intervals of zero amplitude and intervals of pulses at said predetermined amplitude.
4. The fuel pump of claim 1 , characterized by a period of pulse width modulation (14, 14') that is triggered by the ending edge of the control pulse (13') and/or starting edge (11 , 11'), begins after a predetermined delay period (15, 15'), and continues for a predetermined number of pulses at a certain frequency and duty cycle.
5. The fuel pump of claim 1 , characterized by current decay rate (16) or current rise rate (16') that is directly controlled (slowed) by a linear voltage driver.
6. The fuel pump of claim 1 , characterized by current decay rate (16) or current rise rate (16') that is controlled (slowed) by a current chopper driver.
7. The fuel pump of claim 1 , characterized by current decay rate (16) that is controlled (slowed) by current recirculation.
8. The fuel pump of claim 1 , characterized by current decay rate (16) that is controlled (slowed) by use of an active switching device.
9. The fuel pump of claim 1 , characterized by current decay rate (16) or current rise rate (16') that can be selectively switched to a square wave pulse operating mode.
10. The fuel pump of claim 1 , characterized by a control pulse having a nominal current pulse shape modified by current recirculation.
11. A fuel pump having at least one pumping plunger (31) mounted for reciprocation in a respective pumping bore and associated with a pumping chamber whereby fuel at a low inlet pressure is fed to the pumping bore during a charging stroke of the plunger within the bore and the fed fuel is pressurized in the pumping chamber during a discharging stroke of the plunger within the bore, such that a pressurized quantity of fuel from the pumping chamber is discharged to a discharge line, and a spill control system whereby while the fuel is pressurized in the pumping chamber or discharge line a solenoid operated binary spill valve (33) opens a spill path (32) to divert some of the pressurized fuel to a low pressure sump (34), characterized by the start and/or end of the energizing and/or deenergizing power pulse to the solenoid being electronically softened.
12. The pump of claim 11, characterized by a power pulse having a nominal pulse width and electronic softening performed as a series of pulse width modulations at the rise and/or fall of the nominal pulse.
13. The pump of claim 11 , characterized by a nominal pulse that is essentially a square wave of predetermined amplitude and electronic softening that is a series of pulse width modulations consisting of intervals of zero amplitude and intervals of pulses at said predetermined amplitude.
14. The pump of claim 11 , characterized by a spill path that includes a spill port in the wall of the bore at the pumping chamber and a spill line extending from the spill port through the pump body and in fluid communication with said low pressure sump, and wherein the spill valve is situated in the spill line.
15. A fuel pump having at least one pumping plunger mounted for reciprocation in a respective pumping bore and defining with the bore a pumping chamber whereby fuel at a low inlet pressure is fed to the pumping chamber during a charging stroke of the plunger within the bore and the fed fuel is pressurized in the pumping chamber during a discharging stroke of the plunger within the bore, thereby discharging a pressurized quantity of fuel from the pumping chamber through a discharge port to a discharge line, and a spill control system whereby during the discharging stroke a solenoid operated binary spill valve opens a spill path to divert some of the pressurized fuel to a low pressure sump such that the quantity of pressurized fuel that enters the discharge line is less than the quantity of fuel fed to the pumping chamber during the charging stroke, and then closes the spill path before the beginning of the subsequent discharging stroke, characterized in that the start and/or end of the energizing and/or deenergizing power pulse to the solenoid is electronically softened.
PCT/US2005/043422 2004-12-03 2005-12-01 Reduced noise solenoid controlled fuel pump WO2006060545A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63321204P 2004-12-03 2004-12-03
US60/633,212 2004-12-03

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WO2006060545A9 WO2006060545A9 (en) 2006-08-03

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Cited By (11)

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WO2009016044A1 (en) * 2007-07-27 2009-02-05 Robert Bosch Gmbh Method for controlling a solenoid valve of a quantity controller in an internal combustion engine
EP2063100A2 (en) * 2007-11-20 2009-05-27 Hitachi Ltd. Fuel pump control for a direct injection internal combustion engine
WO2010072536A1 (en) * 2008-12-16 2010-07-01 Robert Bosch Gmbh Method for controlling a magnetic valve of a rate control in an internal combustion engine
WO2011061017A1 (en) * 2009-11-18 2011-05-26 Robert Bosch Gmbh Method and device for actuating an amount control valve
EP2363594A3 (en) * 2010-03-05 2012-10-10 Hitachi Ltd. Fuel pump
JP2015098872A (en) * 2010-04-30 2015-05-28 株式会社デンソー Direct-injection fuel injection pump control method
CN105332839A (en) * 2014-06-19 2016-02-17 比亚迪股份有限公司 Gasoline direct injection engine and noise reduction method and device of high-pressure oil pump of gasoline direct injection engine
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