EP0685030A1 - Internal combustion engine fuel injector control system - Google Patents
Internal combustion engine fuel injector control systemInfo
- Publication number
- EP0685030A1 EP0685030A1 EP94931032A EP94931032A EP0685030A1 EP 0685030 A1 EP0685030 A1 EP 0685030A1 EP 94931032 A EP94931032 A EP 94931032A EP 94931032 A EP94931032 A EP 94931032A EP 0685030 A1 EP0685030 A1 EP 0685030A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- swr
- load
- terminal
- swi
- switching
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
- H01F7/1805—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current
- H01F7/1816—Circuit arrangements for holding the operation of electromagnets or for holding the armature in attracted position with reduced energising current making use of an energy accumulator
-
- 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
- F02D2041/2003—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening
- F02D2041/2006—Output circuits, e.g. for controlling currents in command coils using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening by using a boost capacitor
-
- 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
- F02D2041/2017—Output circuits, e.g. for controlling currents in command coils using means for creating a boost current or using reference switching
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
- H01H47/22—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for supplying energising current for relay coil
- H01H47/32—Energising current supplied by semiconductor device
- H01H47/325—Energising current supplied by semiconductor device by switching regulator
Definitions
- the present invention relates to a system for controlling the inductive loads of internal" combustion engine fuel supply injectors.
- BACKGROUND ART As is known, for controlling internal combustion engine injectors, these must be supplied with current the pattern of which generally comprises a rapidly increasing portion, a more slowly increasing portion, a portion oscillating about a mid value, and a rapidly decreasing portion.
- Currently used circuits for obtaining the above pattern substantially comprise a low-voltage supply source, and a capacitor for storing the energy required for producing a rapid current pulse in the inductive load of the injector.
- the capacitor is charged by the supply source to a given voltage value, and is then connected by a first electronic switch to the injector to form a resonant circuit and transfer energy from the capacitor to the injector which thus receives the initial current pulse required for opening it.
- Such circuits also comprise a second electronic switch.
- Known circuits are connected to an electronic control unit for activating the first and second switch for predetermined time intervals and so supplying the injector with current presenting the aforementioned pattern.
- Figure 1 shows a system for controlling the inductive loads of internal combustion engine fuel supply injectors
- Figure 2 shows a simplified electric diagram of a circuit forming part of the electronic system according to the present invention
- Figure 3 shows time graphs of a number of quantities in the Figure 2 system
- Figure 4 shows a detail of the Figure 1 circuit.
- System 1 indicates an electronic system for controlling the inductive loads of injectors 7 of a known fuel injection system 8 of an internal combustion engine 9, in particular a supercharged diesel engine.
- System 1 comprises a control circuit 100 for controlling injectors 7 and to which the injectors are connected over respective control lines 10.
- System 1 also comprises an electronic control unit 12 supplied with a number of information signals (e.g. engine speed, accelerator position, etc.) from engine 9, and cooperating with control circuit 100.
- a number of information signals e.g. engine speed, accelerator position, etc.
- circuit 100 comprises two input terminals 102 and 103 for connection to a supply source B consisting of a battery with a low voltage Vbatt.
- terminal 102 is connected to the anode of a diode D2, the cathode of which is connected to a first common line (actuator line) 104, while terminal 103 is connected directly to a second common line (ground) 105.
- Circuit 100 also comprises a number of actuator circuits 106 connected to one another in parallel between lines 104 and 105, and each comprising an actuator LI, a coupling diode Di, a controlled electronic switch SWi (conveniently formed by a power MOSFET transistor), and a common capacitor ci.
- each actuator Li consists of the coil of a respective injector 7, and presents one terminal connected to line 104, and the other terminal, defining node 107, connected to the anode of diode Dl which connects actuator Li to a third common line (capacitance line) 112.
- the cathode of each diode Di is connected to a second node 113 in turn connected to capacitance line 112 and to a first terminal of common capacitor Ci which provides for storing energy at a higher voltage than Vbatt.
- the other terminal of capacitor Ci is connected to ground line 105.
- Each switch SWi provides for connecting actuator Li to battery B and for transferring energy from actuator Li to capacitor Ci; is interposed between node 107 and ground 105; and presents a control input 108 connected to control unit 12 by a respective control line 56 over which control unit 12 supplies an actuator selecting signal s..
- Circuit 100 also comprises the series connection of an electronic switch SWR (conveniently formed by a power MOSFET transistor) which provides for connecting capacitance line 112 to actuator line 104, and for recirculating the current of load Li.
- SWR electrically formed by a power MOSFET transistor
- switch SWR presents a first terminal connected to capacitance line 112; a second terminal connected to actuator line 104; and a control terminal connected to a control circuit 114 (described in more detail later on) in turn connected to control unit 12 by a control line 58 over which unit 12 supplies a signal s. for controlling switch SWR.
- capacitance line 112 is connected to control unit 12 over line 59 for permitting control unit 12 to monitor the voltage on line 112.
- Control unit 12 is also supplied by a line 113a with a signal proportional to voltage Vbatt, and provides for measuring (by means of a measuring circuit not shown) the value of inductance L of actuators Li.
- Circuit 100 charges capacitor Ci to an appropriate voltage value, and supplies one of actuators Li with a current Ii the pattern of which presents a high-amplitude portion with a rapid leading edge, followed by a lower-amplitude portion terminating with a rapid trailing edge.
- the above pattern is achieved by controlling switches SWR and SWi as described below.
- control unit 12 selects the desired actuator Li by switching respective signal s. to high and closing the relative switch SWi.
- the selected actuator Li is thus connected between capacitance line 112 and ground 105, in parallel with capacitor Ci with which it forms a resonant circuit.
- the selected actuator is therefore supplied with a current pulse formed by a high-frequency sinusoid portion (the value of which is determined by the inductance of actuator Li and the capacitance of capacitor Ci) and produced by rapid discharging of the energy stored in capacitor Ci whose voltage V falls rapidly.
- the capacitor continues discharging up to instant t_ at which voltage V_ on line 112 approximately equals voltage Vbatt, so that diode D2 is biased directly and connects battery B to actuator line 104.
- the selected actuator Li is supplied by low-voltage battery B and, from this point on, injector Li is supplied with a current proportional to Vbatt/L, where L is the value of the inductance of actuator Li selected by control unit 12.
- diode Di of the selected actuator continues to be reverse biased.
- the current in the injector therefore increases slowly until, after a time Tbypass from instant t. (instant t_) , it reaches a value Ipeak.
- the closing time Tbypass of switch SWi is calculated by unit 12 using an electronic map Ml which supplies Tbypass as a function of Vbatt/L input values.
- map Ml supplies Tbypass values increasing alongside an increase in inductance L and alongside a fall in Vbatt.
- switch SWi is opened (high-to-low switching of signal s.).
- diode Di of the selected actuator is biased directly and acts as a freewheeling diode for discharging the formerly charged actuator Li and recirculating current Ii via capacitance line 112 and switch SWR.
- current Ii tends to fall in proportion to -(Vd2)/L - where Vd2 is the voltage drop across diode D2, and L the inductance of selected actuator Li - until it reaches a value Ioffchop at instant t4.
- switch SWi is again closed, so that selected actuator Li is again charged by battery B and disconnected from capacitance line 112 by relative diode Di. In the instants following instant t. , the current
- time Tonchop is calculated by unit 12 using an electronic map M2 which supplies Tonchop as a function of 7batt/L input values.
- map M2 supplies Tonchop values increasing alongside an increase in inductance L of selected actuator Li and alongside a fall in voltage Vbatt.
- Time Toffchop is calculated by unit 12 which presents an interpolation unit C2 for supplying Toffchop according to the equation:
- Toffchop K3+B*(L-K4) where L is the inductance of selected actuator Li expressed in ⁇ H; K3 and K4 are two experimental numeric constants; and B is an experimental gain coefficient.
- switch SWi is appropriately opened and closed successively to maintain a current in selected actuator Li oscillating about a predetermined medium-low value.
- Switches SWR and SWi are opened successively for rapidly discharging actuator Li. More specifically, at instant t,b, switch SWi is opened with switch SWR open. At this step, diode Di is biased directly to connect actuator Li to capacitance line 112 and again form a resonant circuit, so that actuator Li discharges rapidly into capacitor Ci, current Ii decreases in the form of a high-frequency sinusoid portion, and the energy formerly accumulated by actuator Li is transferred to capacitor Ci -whose voltage increases rapidly.
- capacitor Ci remains charged to voltage value
- control unit 3 As shown in Figure 3, at instant t g , control unit
- each actuator Li is supplied with increasing current and, in this step, capacitor Ci remains isolated.
- switch SWi (or all the switches closed previously) is again opened so that, for time Toffric, as in interval t--t_, energy is transferred from the actuator to capacitor CI, current Ii in actuator Li falls to zero (instant t ) , and the voltage of capacitance line 112 increases.
- recharge time Tonric (t -t g ) is calculated by unit 12 using an electronic map M3 for supplying Tonric as a function of Vbatt/L input values.
- map M3 supplies Tonric values increasing alongside an increase in inductance L and alongside a fall in Vbatt.
- Control unit 12 also presents an electronic map C3 for supplying time Toffric.
- Unit 12 also supplies the n number of recharge steps as a function of voltage V_ of capacitor Ci at the end of the injection cycle.
- the n number is calculated by unit 12 using an electronic map M4 for supplying n as a function of an input V ? value.
- Figure 4 shows a detail of control circuit 114 supervising switches of MOSFET SWR.
- Circuit 114 comprises a first capacitor CI with a first terminal connected to line 112, and a second terminal connected to the cathode of a diode Dr, the anode of which is connected to node 113.
- Circuit 114 comprises a second capacitor C2 connected parallel to a Zener diode Dz and presenting a first terminal connected to line 112, and a second terminal connected to the cathode of diode Dr via a resistor R.
- Circuit 114 also comprises a first electronic switch SWB (conveniently formed by an optoisolator) located between line 112 and a control terminal (GATE) 115 of MOSFET SWR; and a second electronic switch SWA (conveniently formed by an optoisolator) interposed between control terminal 115 and the node 116 common to diode Dz, capacitor C2 and resistor R.
- SWB electrically formed by an optoisolator
- GATE control terminal
- SWA electrically formed by an optoisolator
- Switches SWA and SWB are controlled in complementary manner by the logic signal from control unit 12, i.e. one is always on while the other is off.
- capacitor Ci In actual use, when charging capacitor Ci as described previously, the magnetic energy accumulated by the injectors is transferred to capacitors Ci and CI which are charged as a function of the respective capacitance values. More specifically, as the ratio of the capacitance values of capacitors CI and Ci is less than 1, capacitor CI is charged to a voltage VI lower than that at the terminals of capacitor Ci, so that diode Dr is disabled, and capacitor CI is isolated from capacitor Ci and acts as a constant voltage source with one terminal connected to the source terminal of MOSFET SWR.
- capacitor C2 is charged to a voltage Vz which is determined by Zener diode Dz, is lower than the charge voltage VI of capacitor CI, and is higher than the threshold voltage Vgsth required for closing MOSFET
- switch SWA is opened and switch SWB closed, so that voltage Vgs between control terminal 115 and the source terminal of MOSFET SWR equals zero, thus disabling the MOSFET.
- switch SWB For closing MOSFET SWR, switch SWB is opened and switch SWA closed, so that voltage Vz at the terminals of capacitor C2 is applied between control terminal (GATE) 115 and the source terminal of the MOSFET which thus closes. During this step, the current supplied to
- MOSFET SWR is limited by resistance R, while Zener diode
- Dz protects GATE 115 of the MOSFET against overvoltage.
- switches SWA and SWB are activated in advance with respect to the start and end of injection.
- Circuit 114 therefore provides for obvious advantages by supplying MOSFET SWR at all times with sufficient voltage for rapidly closing it, and by drawing no energy from capacitor Ci for biasing optoisolators SWA and SWB.
- circuit 114 is extremely straightforward and reliable.
- the system according to the present invention therefore provides for flexibly calculating, for each selected actuator Li, the control times of first and second switches SWi, SWR, by virtue of said times being correlated to the inductance L of the selected actuator Li and to the voltage Vbatt of battery B.
- each- injector 7 is regulated as a function of the inductance L of the injector coil. Since the coils of injectors 7 of system 8 invariably present differing inductance values L (due to manufacturing tolerances) , each injector 7 is therefore automatically supplied with the most appropriate current value.
- an increase in inductance L makes it increasingly difficult (for known physical reasons) to inject current into actuator Li, so that time Tbypass is automatically increased to permit the current supplied to the injector to reach the predetermined Ipeak value.
- a fall in battery voltage Vbatt reduces the current gradient in interval t_-t , so that time Tbypass is again increased to permit the current supplied to the injector to reach the predetermined Ipeak value.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO930870A IT1261360B (en) | 1993-11-19 | 1993-11-19 | ELECTRONIC SYSTEM FOR THE CONTROL OF INDUCTIVE INJECTOR LOADS A FUEL SYSTEM FOR INTERNAL COMBUSTION ENGINES |
ITTO930870 | 1993-11-19 | ||
PCT/EP1994/003600 WO1995014162A1 (en) | 1993-11-19 | 1994-10-31 | Internal combustion engine fuel injector control system |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0685030A1 true EP0685030A1 (en) | 1995-12-06 |
EP0685030B1 EP0685030B1 (en) | 1998-09-09 |
Family
ID=11411885
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94931032A Expired - Lifetime EP0685030B1 (en) | 1993-11-19 | 1994-10-31 | Internal combustion engine fuel injector control system |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0685030B1 (en) |
DE (1) | DE69413206T2 (en) |
IT (1) | IT1261360B (en) |
WO (1) | WO1995014162A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2286507B1 (en) * | 2008-05-13 | 2016-07-06 | Automatic Switch Company | Low power solenoid control system and method |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9622330D0 (en) * | 1996-10-26 | 1996-12-18 | Lucas Ind Plc | Drive circuit |
DE19812744A1 (en) * | 1998-03-24 | 1999-09-30 | Bosch Gmbh Robert | Method and device for switching an inductive consumer |
ITTO20030609A1 (en) * | 2003-08-05 | 2005-02-06 | Fiat Ricerche | METHOD OF OPERATION OF AN INDUCTIVE ELECTRO-ACTUATOR CONTROL DEVICE. |
US7349193B2 (en) * | 2005-04-26 | 2008-03-25 | Delphi Technologies, Inc. | Solenoid driver with high-voltage boost and reverse current capability |
FR2925977B1 (en) * | 2007-12-26 | 2010-04-16 | Renault Sas | CONTROL DEVICE FOR SOLENOID, ELECTRIC STARTER INCORPORATING THE SAME, AND CORRESPONDING CONTROL METHODS. |
DE102019200179A1 (en) * | 2019-01-09 | 2020-07-09 | Robert Bosch Gmbh | Control device for injectors |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61258949A (en) * | 1985-05-13 | 1986-11-17 | Honda Motor Co Ltd | Solenoid valve drive unit for internal-combustion engine |
IT1217171B (en) * | 1987-08-25 | 1990-03-14 | Marelli Autronica | CIRCUIT FOR THE DRIVING OF INDUCTIVE LOADS IN PARTICULAR FOR THE CONTROL OF THE ELECTROINJECTORS OF A DIESEL CYCLE INTERNAL COMBUSTION ENGINE |
JPH03199667A (en) * | 1989-12-27 | 1991-08-30 | Yamaha Motor Co Ltd | 2-cycle engine air/fuel injection device |
IT1251259B (en) * | 1991-12-23 | 1995-05-05 | Elasis Sistema Ricerca Fiat | CONTROL CIRCUIT OF PREVALENTLY INDUCTIVE LOADS, IN PARTICULAR ELECTROINJECTORS. |
DE69320826T2 (en) * | 1992-03-26 | 1999-01-21 | Zexel Corp | Fuel injector |
-
1993
- 1993-11-19 IT ITTO930870A patent/IT1261360B/en active IP Right Grant
-
1994
- 1994-10-31 WO PCT/EP1994/003600 patent/WO1995014162A1/en active IP Right Grant
- 1994-10-31 DE DE69413206T patent/DE69413206T2/en not_active Expired - Lifetime
- 1994-10-31 EP EP94931032A patent/EP0685030B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9514162A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2286507B1 (en) * | 2008-05-13 | 2016-07-06 | Automatic Switch Company | Low power solenoid control system and method |
Also Published As
Publication number | Publication date |
---|---|
ITTO930870A1 (en) | 1995-05-19 |
WO1995014162A1 (en) | 1995-05-26 |
EP0685030B1 (en) | 1998-09-09 |
DE69413206D1 (en) | 1998-10-15 |
DE69413206T2 (en) | 1999-03-25 |
IT1261360B (en) | 1996-05-20 |
ITTO930870A0 (en) | 1993-11-19 |
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