EP0264640A1
Expired / Lapsed
EP
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Electronically controlled fuel injection system
Assignee: Ganser Hydromag AG
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Filing: 1987-09-19
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Granted: —
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Expires: 2007-09-19
Abstract
Abstract The fuel injectors (4) of an internal combustion engine (2) are connected to a pump (10) by means of fuel supply lines (12) which open into the high-pressure part (34) of the injectors (4). The cross-sectional area of the fuel connection (12, 34) between the pump (10) and the injection orifices of the injectors (4) is substantially bigger than the total cross-sectional area of all of the injection orifices of an injector (4). An unrestricted flow path for the pressurized fuel is provided between the pump (10) and the area immediately upstream of the injection orifices. Due to the small pressurized volume of the system, the transient behaviour of the injection system is fast and can easily be matched to the needs of a particular engine application.
Inventors
- 👤 Marco Alfredo Ganser
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 18:14
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/20; F02M59/36; F02M59/366; F02M47/00; F02M47/02; F02M47/027; F02M63/00; F02M63/02; F02M63/0225; F02M65/00; F02M65/005; F02B; F02B2275/00; F02B2275/14; F02M2200/00; F02M2200/24; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
277 words
Fuel injection system for an internal combustion engine (2) comprising at least one electromagnetically operated fuel injector (4) for injecting pressurized fuel into a combustion chamber of the internal combustion engine (2), said at least one fuel injector (4) having a body portion (44) with a valve seat (36), at least one discharge orifice (58) and an injector valve member (52) cooperating with said valve seat (56) for closing said discharge orifice (58) and being shiftable to be momentarily lifted from said valve seat (56) for opening said discharge orifice (58) and discharging pressurized fuel into a combustion chamber of the internal combustion engine, said fuel injection system further comprising a high pressure fuel pump (10) driven by the internal combustion engine (2), at least one injection line (12, 14, 42) leading from said pump (10) to said at least one fuel injector (4) and providing a fuel flow path from said pump (10) to a region (54) immediately upstream of said valve seat (56), the cross sectional area of said fuel flow path (12, 14, 42) leading from said pump (10) to said region (54) upstream of said valve seat (56) being substantially bigger than the total cross sectional area of all injection orifices (58) of said at least one fuel injector (4), said fuel flow path (12, 14, 42) being substantially free of flow restrictions to allow a substantially unrestricted fuel communication between said pump (10) and said region (54) around and immediately upstream of said valve seat (56), the fuel pressure in said fuel flow path (12, 14, 42) before, during and after an injection event being substantially equal to the fuel injection pressure.
Claim 2
Dependent Claim
277 words
Fuel injection system for an internal combustion engine (2) comprising at least one electromagnetically operated fuel injector (4) for injecting pressurized fuel into a combustion chamber of the internal combustion engine (2), said at least one fuel injector (4) having a body portion (44) with a valve seat (36), at least one discharge orifice (58) and an injector valve member (52) cooperating with said valve seat (56) for closing said discharge orifice (58) and being shiftable to be momentarily lifted from said valve seat (56) for opening said discharge orifice (58) and discharging pressurized fuel into a combustion chamber of the internal combustion engine, said fuel injection system further comprising a high pressure fuel pump (10) driven by the internal combustion engine (2), at least one injection line (12, 14, 42) leading from said pump (10) to said at least one fuel injector (4) and providing a fuel flow path from said pump (10) to a region (54) immediately upstream of said valve seat (56), the cross sectional area of said fuel flow path (12, 14, 42) leading from said pump (10) to said region (54) upstream of said valve seat (56) being substantially bigger than the total cross sectional area of all injection orifices (58) of said at least one fuel injector (4), said fuel flow path (12, 14, 42) being substantially free of flow restrictions to allow a substantially unrestricted fuel communication between said pump (10) and said region (54) around and immediately upstream of said valve seat (56), the fuel pressure in said fuel flow path (12, 14, 42) before, during and after an injection event being substantially equal to the fuel injection pressure.
Claim 3
Dependent Claim
41 words
Fuel injection system according to claim 1; wherein the frequency of the pumping strokes of said fuel pressure pump (10) is the same or an entire mutiple of the frequency of the injection events of the totality of the injectors (4).
Claim 4
Dependent Claim
50 words
Fuel injection system according to claim 1, wherein said fuel pump (10) is provided with a drive shaft (5) driven by the crankshaft (7) of the internal combustion engine (2), the drive ratio between said crankshaft (7) and said drive shaft (5) being 1:1 or an entire multiple of 1:1.
Claim 5
Dependent Claim
25 words
Fuel injection system according to claim 1, wherein said fuel pump (10) comprises pumping plungers, said pumping plungers are movable according to a harmonic function.
Claim 6
Dependent Claim
27 words
Fuel injection system according to claim 4, wherein anyone of the injection events takes places during part of a pumping stroke of anyone of said pumping plungers.
Claim 7
Dependent Claim
84 words
Fuel injection system according to claim 1, further comprising an electrically operated spill valve (80; 18) connected to said high pressure injection line (12, 14, 42) and a low pressure return line (30), and a control unit (20) for controlling the opening and closing of said spill valve (80; 18) for spilling fuel delivered by said fuel pump (10) into said return line (30) in order to adjust the quantity of fuel delivered by said pump (10) to said at least one injector (4).
Claim 8
Dependent Claim
21 words
Fuel injection system according to claim 6, wherein said fuel pump (10) delivers a constant amount of fuel per pumping stroke.
Claim 9
Dependent Claim
86 words
Fuel injection system according to the claim 6; wherein the timing for the signal to close the spill valve (80; 18) is choosen by the control unit (20) in such a way that the pressure wave induced in said injection line (12, 14, 42) by closing said spill valve (80; 18) reaches the region (54) immediately around and upstream of said valve seat (56) of said at least one injector (4) immediately before orduring the momentary opening of said discharge orifice (58) of said injector (4).
Claim 10
Dependent Claim
74 words
Fuel injection system according to claim 1, comprising at least four fuel injectors (4) arranged in groups of at least two fuel injectors (4), the injectors (4) of each group being connecte d to one another by means of fuel connection lines (12) providing an unrestricted fuel flow path, the injectors (4) of each group being further connected to a common fuel supply line(12, 12a, 14)connected to the outlet of said fuel pump (10).
Claim 11
Dependent Claim
54 words
Fuel injection system according to claim 9, comprising a check valve (16, 17) arranged between said common fuel supply line (14) and each fuel connection line (12) connecting the injectors (4) of each group, said check valve (16, 17) preventing the flow of fuel in the direction towards said common fuel supply line (14).
Claim 12
Dependent Claim
59 words
Fuel injection system according to claim 10, further comprising a fuel chamber (36) for each group of injectors (4), said fuel chamber (36) being arranged symmetrically with regard to the injectors (4) of the associated group and being connected to all injectors (4) of the respective group by means of fuel lines (12) providing an unrestricted fuel flow path.
Claim 13
Dependent Claim
41 words
Fuel injection system according to claim 1, wherein the length of the fuel flow path from said fuel pump (10) to said region (54) immediately upstream of said valve seat (56) is the same for all of said fuel injectors (4).
References Cited (Backward Citations)
FR1176110A
Cited
US4258674A
Cited
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