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
  • F02D41/30—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
  • F02D—CONTROLLING COMBUSTION ENGINES
  • F02D41/00—Electrical control of supply of combustible mixture or its constituents
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/04—Introducing corrections for particular operating conditions
  • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
• • 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
  • F02D41/02—Circuit arrangements for generating control signals
  • F02D41/04—Introducing corrections for particular operating conditions
  • F02D41/12—Introducing corrections for particular operating conditions for deceleration
  • F02D41/123—Introducing corrections for particular operating conditions for deceleration the fuel injection being cut-off
• • 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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0012—Valves
  • F02M63/0014—Valves characterised by the valve actuating means
  • F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
  • F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
• • 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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0012—Valves
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
  • F02M63/004—Sliding valves, e.g. spool valves, i.e. whereby the closing member has a sliding movement along a seat for opening and closing
• • 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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0012—Valves
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
  • F02M63/0045—Three-way valves
• • 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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/0012—Valves
  • F02M63/0031—Valves characterized by the type of valves, e.g. special valve member details, valve seat details, valve housing details
  • F02M63/005—Pressure relief valves
• • 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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
  • F02M63/0205—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine
  • F02M63/0215—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively for cutting-out pumps or injectors in case of abnormal operation of the engine or the injection apparatus, e.g. over-speed, break-down of fuel pumps or injectors ; for cutting-out pumps for stopping the engine by draining or closing fuel conduits
• • 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
  • F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
  • F02M63/02—Fuel-injection apparatus having several injectors fed by a common pumping element, or having several pumping elements feeding a common injector; Fuel-injection apparatus having provisions for cutting-out pumps, pumping elements, or injectors; Fuel-injection apparatus having provisions for variably interconnecting pumping elements and injectors alternatively
  • F02M63/0225—Fuel-injection apparatus having a common rail feeding several injectors ; Means for varying pressure in common rails; Pumps feeding common rails
• • 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
  • F02D41/3863—Controlling the fuel pressure by controlling the flow out of the common rail, e.g. using pressure relief valves
• • 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
  • F02M59/02—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type
  • F02M59/04—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps of reciprocating-piston or reciprocating-cylinder type characterised by special arrangement of cylinders with respect to piston-driving shaft, e.g. arranged parallel to that shaft or swash-plate type pumps
• • 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
  • F02M59/12—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps having other positive-displacement pumping elements, e.g. rotary
  • F02M59/14—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps having other positive-displacement pumping elements, e.g. rotary of elastic-wall type
• • 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
  • F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
  • F02M59/46—Valves
  • F02M59/466—Electrically operated valves, e.g. using electromagnetic or piezoelectric operating means

Definitions

• the present invention relates to a device for controlling the flow rate of a direct petrol injection pump.
• the injection system known by the acronym I.D.E. (Direct Fuel Injection) includes a high pressure pump which supplies gasoline under high pressure to a common chamber, usually designated by the expression “common rail”, to which the injectors are directly connected.
• the present invention relates to a device for controlling the gasoline intake flow rate in the high pressure pump in an I.D.E. system. by means of which the high-pressure pump will deliver to the common chamber, or "common rail", only very precisely the volume of petrol necessary for the operation of the engine.
• the method according to the present invention consists in fitting, inside the solenoid valve controlling the arrival of low-pressure petrol at the intake of the high-pressure pump, one or more internal leaks, ie low pressure upstream of the solenoid valve to the downstream low pressure, ie from high pressure to low pressure, which makes it possible to resolve the specific problems which arise for the following three operating modes: engine brake, engine stop and idling.
• Figure 1 a schematic view of an I.D.E.
• Figure 2 a view, also schematic, of a pump supplying gasoline at high pressure provided with a control device according to the invention.
• Figure 3 a view of a second alternative embodiment.
• Figure 4 a view of a third alternative embodiment.
• Figure 5 a partial view of Figure 4, on an enlarged scale illustrating a fourth embodiment.
• Figure 6 a diagram illustrating the operation of the installation.
• Figure 7 a diagram illustrating the operation with an additional leak.
• FIG. 8 an example of implementation of the invention.
• the high-pressure petrol supply circuit includes a petrol tank; a low pressure pump or booster pump B; a flow control solenoid valve E, located upstream of a high pressure pump P; a pressure relief valve D; a high pressure chamber C (usually called common rail) to which the injectors I are connected.
• the pump P can be any pump capable of supplying the chamber
• this pump P is a pump of the type called transfer pump which comprises an oil part and a petrol part which are separated from each other in a leaktight manner.
• the oil subjected by the reciprocating movement back and forth, acts on a deformable element which exerts a pumping action on the petrol.
• the transfer pump is illustrated schematically in Figures 2, 3, and 4 and is not shown in detail because it is known and is not the subject of the present invention.
• the oil is subjected to reciprocating movements back and forth by hollow pistons 1. These pistons are driven in an alternating movement because they are supported by their head 2 on an oscillating plate. This swash plate is not shown because it is a known means.
• a piston 1 moves (upwards in FIG. 2) in its cylinder 4, the oil lifts the valve 5.
• a deformable member 9, in the form of a bellows is tightly fixed at one end 6 to the support of the cylinder 4 and at its other end 8 to the valve 5.
• the valve 5 lowers.
• the back and forth movements of the oil cause a back and forth movement of said valve 5 and therefore of elongations and contractions of the bellows 9.
• the bellows 9 is placed in a chamber filled with petrol. This room is not shown because such a provision is known. The extensions and contractions of the bellows 9 cause a pumping effect.
• Each chamber in which a bellows 9 struggles has a pipe 10 which communicates on the one hand with the low pressure circuit 20 by a non-return valve 21 and on the other hand with the high pressure circuit 32 by a non-return valve 31.
• the bellows 9 When the bellows 9 is deployed under the effect of the high pressure of the oil, it drives out the petrol at the same pressure through the valve 31; when it retracts the gasoline supplied by the pump B passes through the non-return valve 21 and enters the chamber in which the bellows 9 struggles.
• Upstream regulation of the petrol flow is used by regulating the petrol flow arriving at the pump P by means of a solenoid valve 40 disposed on the line 23 arriving from the low pressure pump B and distributing the petrol to the circuit d supply 20 of said pump P via a line 22a. It is known to specialists that, in practice, it is very difficult to produce a solenoid valve having no internal leakage, which is a drawback.
• the present invention consists in using this drawback by using internal leaks from the solenoid valve 40 to solve the problems described above.
• This pipe 32 has a first bypass 32a which leads to the solenoid valve 40 and a second bypass which leads to a pressure relief valve D.
• the solenoid valve 40 consists of a body 41 in which is placed a jacket 42 in which slides a drawer 43 which is subjected on one side to a spring 44 and on the other to an electromagnet or motor 45.
• the drawer 43 has two peripheral grooves 47 and 46 which are placed opposite one of the inlet 32a of the high pressure manifold 32, the other of the outlet 22a of the low pressure towards the low pressure manifold 22.
• the groove 46 is uncovered so that the low pressure gasoline arriving through the line 25 communicates with the line 22a through the passage formed between the upper end of the jacket 42 and the throat 46.
• the dimension of this passage varies as a function of the position of the spool 43 and this is how the flow of gasoline at low pressure arriving at the pump is regulated according to the needs of the engine.
• the solenoid valve 40 is determined so that the leakage rate of the high pressure gasoline towards low pressure (at 47a) is greater than the leakage rate of the low pressure gasoline upstream of the solenoid valve towards downstream low pressure (at 46a).
• a piloted check valve is added to the solenoid valve with slide valve (40-43), which is interposed between the low pressure (BP) upstream and the low pressure (BP) downstream from the solenoid valve.
• a leakage control device is added to the high pressure (HP) outlet of the solenoid valve.
• a bypass 32a leading to the solenoid valve 40 for regulating the low pressure flow going to the pump, so as to recycle constantly by the space 47 has a leakage rate of gasoline under high pressure towards the low pressure circuit through said solenoid valve 40.
• the non-return valve 50 is controlled by the electromagnet 45 by means of a push rod 51.
• the valve is counter-held in the closed position by a spring 52 bearing on a support 53, provided with orifices 54; this support 53 being in abutment against the slide 43 of the solenoid valve 40.
• the solenoid valve 40 In the rest position, the solenoid valve 40 is closed.
• the ball 50 rests on its seat in a sealed manner and the drawer 43 covers the supply light 42a.
• the internal leakage of the solenoid valve 40 is contained in the envelope 41 of the drawer 43. This is the "zero flow" position, that is to say the suppression of the flow Ql + Q2.
• This variant has the advantage of ensuring a real zero flow rate without leakage of the booster pressure (BP) as is the case in the examples of FIG. 2.
• FIG 4 shows another alternative embodiment, in which the same elements have the same references.
• bypass function a function called "bypass function" which allows, among other things, to short-circuit the HP pump for starting at BP. In certain starting conditions, the engine starter does not rotate fast enough for the high pressure pump to provide sufficient flow to the injectors.
• the return spring 44 of the drawer 43 is enclosed in a cage of variable length, constituted by two elements 60/61 which can approach each other.
• the low-pressure petrol coming from the booster pump B via the line 23 arrives laterally in the chamber 64 in which the cage 60/61 is located, which closes the return spring 44.
• This chamber 64 has at its upper end an orifice 62 which communicates by a pipe 63 with the rail C and therefore the HP which is there.
• FIG. 6 shows four curves (I), (II), (III) and (IV), given by way of example.
• the abscissa is graduated as a percentage of PWM (Puises Width Modulation) which is the usual means of controlling a solenoid valve by modifying the width of the pulses arriving at the motor 45.
• PWM Pulises Width Modulation
• Curve (I) represents the consumption of the engine at idle: it is therefore constant.
• Curve (II) represents the leakage rate through the solenoid valve: it increases with the PWM (reduction in drawer / jacket overlap).
• Curve (III) represents the increase in flow as a function of PWM.
• the curve (IV) represents the pressure necessary to open the valve 60/62 towards the common rail C as a function of PWM.
• the device according to the invention it is possible to cut off the supply and have a negative flow which returns to the tank and drops the pressure in the common rail C.
• an additional permanent leakage rate at the valve going to the common rail C that is to say the valve 60/62.
• the part 60 of the cage 60/61 does not rest directly against the orifice 62, but on a seat 65 in which one or more conduits have been precisely calibrated so as to ensure through said seat 65 a permanent calibrated leak.
• the curve (I) has been replaced by the curve (V) which represents the consumption of the engine at idle + the leak rate through the calibrated orifice of leak through the seat 65.
• FIG. 8 represents an exemplary embodiment of the device shown diagrammatically in FIGS. 5 and 6.
• the solenoid valve includes a drawer 100 (corresponding to drawer 43) which is actuated by a motor 101 (corresponding to 45).
• the upstream BP coming from the reservoir thanks to the booster pump, arrives via the pipe 102 (corresponding to 23), in a chamber 103 (corresponding to 64).
• the downstream BP coming from the internal leak, is collected in the groove 104 (corresponding to 46) and is directed towards the inlet of the HP pump via the line 105 (corresponding to 22a).
• the internal leakage from the upstream BP to the downstream BP occurs in the zone referenced 106 between the chamber 103 and the groove 104.
• the drawer is counter-held by a spring 107 (corresponding to the spring 44) which is located in the chamber 103 .
• the spring 107 is disposed between the drawer 100 and a pusher 108 carrying a ball 109 which closes a small pipe 110 which opens into a pipe 111 which communicates with the common rail C.
• the pipes 110 and 111 are formed through a part 112 which is fixed to the folder 114 (corresponding to 42) in which the drawer 100 slides.
• the part 112 is fixed to the end of the jacket 114 by providing a calibrated passage 113 allowing a permanent leak.
• Line 111 and calibrated leak 113 emerge into a chamber 115 which, via line 116 (corresponding to 63), communicates with common rail C.
• the ball 109 on its seat of the pipe 110 and the calibrated passage 113 correspond to the valve 60/62 and to the leak 65 of FIG. 6.

Applications Claiming Priority (5)

Publications (2)

Family

ID=30117025

Family Applications (1)

Country Status (7)

Families Citing this family (10)

Family Cites Families (12)

• 2003
  • 2003-07-08 WO PCT/FR2003/002118 patent/WO2004007950A2/fr active Application Filing
  • 2003-07-08 US US10/520,918 patent/US7270113B2/en not_active Expired - Fee Related
  • 2003-07-08 AU AU2003273426A patent/AU2003273426A1/en not_active Abandoned
  • 2003-07-08 EP EP03755583A patent/EP1521913B1/de not_active Expired - Lifetime
  • 2003-07-08 JP JP2004520737A patent/JP4441608B2/ja not_active Expired - Fee Related
  • 2003-07-08 AT AT03755583T patent/ATE442524T1/de not_active IP Right Cessation
  • 2003-07-08 DE DE60329182T patent/DE60329182D1/de not_active Expired - Fee Related

Non-Patent Citations (1)

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