EP0427127A1 - A control device for fuel injectors - Google Patents
A control device for fuel injectors Download PDFInfo
- Publication number
- EP0427127A1 EP0427127A1 EP19900121007 EP90121007A EP0427127A1 EP 0427127 A1 EP0427127 A1 EP 0427127A1 EP 19900121007 EP19900121007 EP 19900121007 EP 90121007 A EP90121007 A EP 90121007A EP 0427127 A1 EP0427127 A1 EP 0427127A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- power unit
- injector
- current
- level
- unit
- 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.)
- Withdrawn
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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
- F02D41/20—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
- F02D2041/2031—Control of the current by means of delays or monostable multivibrators
Definitions
- the present invention relates to control devices for fuel injectors and has been developed with particular attention to its possible use for controlling injectors for internal combustion engines supplied with petrol.
- the object of the present invention is to provide a control device which reduces dissipation both in the control circuit and in the injector itself by means of so-called "peak & hold" operation.
- the device according to the invention is intended to act as the control circuit for a load L constituted in actual fact by the excitation winding of an electromagnetically-operated injector (an electro-injector), such as, for example, a petrol injector forming part of a "single-point" injection system.
- an electromagnetically-operated injector such as, for example, a petrol injector forming part of a "single-point" injection system.
- the device 1 is intended to supply the injector S according to a so-called "peak & hold" function, that is by making a current I c with a time trace of the type shown by the graph of Figure 3.d pass through the excitation winding of the injector L.
- the time trace of the current I c which is intended to be repeated for each injection operation, shows: - an initial stage in which the current I c rises rapidly from 0 to a maximum peak value I p (for example, of the order of 4A) dependent on the supply voltage V b of the injector, so as to ensure that the injector is opened fully (time interval t1), - a subsequent reduction stage in which the intensity of the current I c falls (interval t2) to a substantially fixed holding value Im (for example, 1A ⁇ 0.3A), - a holding stage in which the value Im is held so as to ensure that the injector remains open (interval t3), and - a final turn-off stage which should be as rapid and steady as possible, in which the current I c returns to 0.
- a maximum peak value I p for example, of the order of 4A
- the injector L as seen by the device 1, constitutes an overall load L defined by a resistance of the order of 1.5-1.7 ohms and by an inductance of the order of 2.88 mH.
- the injector S is driven by two solid-state power units (typically bipolar or MOSFET power transistors) TR1, TR2 in an arrangement in which the unit TR2 constitutes a low-side power element since, in practice, it is connected in series with the load L between the supply voltage V b and the earth of the circuit so as to control the intensity of the current I c which flows towards the injector L.
- solid-state power units typically bipolar or MOSFET power transistors
- the unit TR1 is a high-side power element which, together with a diode D1 connected to it in series, constitutes a feedback branch which is in parallel with the load L and enables the injector current to be recirculated during the holding stage t2, thus achieving a slow discharge of the energy stored in the injector through the diode D1.
- a Zener diode DZ has its cathode connected to the connecting line between the load L and the unit TR2 and its anode connected to earth.
- the function of the Zener diode DZ (which in practice is connected in parallel with the unit TR2) is essentially to ensure a rapid discharge during the closure of the injector (interval t4).
- An analog-digital converter senses the battery voltage V b through a line 3 and supplies a corresponding digital signal to a processing unit (CPU) 4 whose function will be described further below.
- CPU processing unit
- a further line 5 is also connected to the analog/digital converter 2 and constitutes the output line of a current sensor 6 which senses the current passing through the unit TR2 (and hence the value of the current I c which passes through the injector L when it is driven by the unit TR2).
- the processing unit 4 is intended to control the operation of three timers T1, T2 and T3.
- the timer T1 pilots the unit TR1, whilst the outputs of the timers T2 and T3 converge at an OR-type logic gate 7 whose output in turn pilots the unit TR2.
- the processing unit 4, as well as the timers T1, T2 and T3, the converter 2 and the logic gate 7, may to advantage be integrated, even partially, in a microprocessor circuit, for example, as respective functions thereof.
- the time graphs of Figure 3 relate to a single fuel-injection operation started by the unit 4 (time 0 of the time scale on the abscissa) as a result of the receipt of a synchronisation signal generated, according to known criteria, on the input line S.
- the unit 4 activates the timer T2 causing the activation of the power unit TR2, so that, in practice, the injector L is connected between the battery voltage V b and earth.
- the duration of the interval t1 is determined by the unit 4 (by means of a simple calculation algorithm stored therein) in dependence on the battery voltage (V b ) which the unit 4 reads by means of the converter 2.
- this is an open-loop control system: if the voltage V b (which may vary with the charge level of the battery) is known and the desired maximum current level I p (for example, 4 A) is known, the duration of the time interval t1 necessary to reach that current level can be calculated. In general, if V b drops, it will be necessary to increase the duration of the interval t1.
- the timer T2 is deactivated and the timers T1 and T3 are also kept deactivated. Under these conditions, both the units TRl and TR2 are deactivated (that is, cut off) so that the injector S is discharged through the Zener diode DZ with a rapid decrease in the intensity of the current I c which falls to the holding value I m .
- the unit 4 When the intensity I c reaches the value I m , which takes place during the interval t2 (whose duration can easily be calculated by the unit 4 on the basis of the battery voltage V b , the duration of t1 and the value of I m to be attained), the unit 4 simultaneously activates the timer T1 (thus activating TR1 and hence the feedback circuit around the load S), whilst the timer T3 (like the unit TR2 controlled thereby through the gate 7) is activated in a pulsed manner, that is, at a fixed frequency (for example 20 KHz) with a selectively variable duty-cycle.
- a fixed frequency for example 20 KHz
- the current can thus be recirculated slowly through the diode Dl (the unit TR1 being made conductive) and, at the same time, the value of the current I c flowing through the load L is stabilised around an average level (Im) whose value depends on the duty-cycle set by the timer T3.
- the current value I c increases when the unit TR2 is conducting and decreases when the unit TR2 is cut off.
- This stage is maintained continuously throughout the injection interval t3.
- the current signal detected by the sensor 6 and transferred to the unit 4 by means of the converter 2 enables a fine adjustment of the current.
- the unit 4 Upon completion of the fuel injection (at the end of the interval t3), the unit 4 once again switches off the timers T1 and T3 and cuts off the units TR1 and TR2, thus facilitating the rapid discharge of the load L through the Zener dioode nz with a consequent rapid fall in the intensity of the current I c to zero (interval t4).
- the injector S integrates the current which is stabilised, so to speak, around the desired average current I m .
- the frequency selected is high enough to ensure that the ripple of the average value satisfies the specification (that the ripple is below a given threshold).
- the duty-cycle generated is varied by the unit 4 in dependence on the battery voltage V b (detected by means of the converter 2) and on the characteristics of the injector L.
- timers T2 and T3 (which are intended to be activated alternately) could be combined in a single timer element.
- the circuit described above may be advantageous in terms of simplicity of execution.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The device enables an injector (L) with a low resistance to be driven with a "peak & hold" function, reducing dissipation both in the control circuit and in the injector itself. For this purpose, the load constituted by the injector (L) is supplied by means of two power units (TR1, TR2) which are activated selectively by three timers (T1, T2, T3).
Description
- The present invention relates to control devices for fuel injectors and has been developed with particular attention to its possible use for controlling injectors for internal combustion engines supplied with petrol.
- In general, the object of the present invention is to provide a control device which reduces dissipation both in the control circuit and in the injector itself by means of so-called "peak & hold" operation.
- According to the present invention, this problem is resolved by virtue of a control device having the characteristics cited specifically in the claims which follow.
- The invention will now be described purely by way of non-limiting example, with reference to the appended drawings, in which:
- Figures 1 and 2 show two possible embodiments of a device according to the invention, in block diagrammatic form, and
- Figure 3 shows the operating sequence of a device according to Figure 1 or Figure 2, in the form of superposed time graphs with identical times scales.
- The device according to the invention, generally indicated 1 in Figures 1 and 2, is intended to act as the control circuit for a load L constituted in actual fact by the excitation winding of an electromagnetically-operated injector (an electro-injector), such as, for example, a petrol injector forming part of a "single-point" injection system.
- More specifically, the
device 1 is intended to supply the injector S according to a so-called "peak & hold" function, that is by making a current Ic with a time trace of the type shown by the graph of Figure 3.d pass through the excitation winding of the injector L. - More precisely, the time trace of the current Ic, which is intended to be repeated for each injection operation, shows:
- an initial stage in which the current Ic rises rapidly from 0 to a maximum peak value Ip (for example, of the order of 4A) dependent on the supply voltage Vb of the injector, so as to ensure that the injector is opened fully (time interval t₁),
- a subsequent reduction stage in which the intensity of the current Ic falls (interval t₂) to a substantially fixed holding value Im (for example, 1A ± 0.3A),
- a holding stage in which the value Im is held so as to ensure that the injector remains open (interval t₃), and
- a final turn-off stage which should be as rapid and steady as possible, in which the current Ic returns to 0. - By way of reference, the injector L, as seen by the
device 1, constitutes an overall load L defined by a resistance of the order of 1.5-1.7 ohms and by an inductance of the order of 2.88 mH. - With reference to both Figure 1 and Figure 2, the injector S is driven by two solid-state power units (typically bipolar or MOSFET power transistors) TR1, TR2 in an arrangement in which the unit TR2 constitutes a low-side power element since, in practice, it is connected in series with the load L between the supply voltage Vb and the earth of the circuit so as to control the intensity of the current Ic which flows towards the injector L.
- The unit TR1, however, is a high-side power element which, together with a diode D1 connected to it in series, constitutes a feedback branch which is in parallel with the load L and enables the injector current to be recirculated during the holding stage t₂, thus achieving a slow discharge of the energy stored in the injector through the diode D₁.
- A Zener diode DZ, however, has its cathode connected to the connecting line between the load L and the unit TR2 and its anode connected to earth. The function of the Zener diode DZ (which in practice is connected in parallel with the unit TR2) is essentially to ensure a rapid discharge during the closure of the injector (interval t₄).
- An analog-digital converter, indicated 2, senses the battery voltage Vb through a line 3 and supplies a corresponding digital signal to a processing unit (CPU) 4 whose function will be described further below.
- In the embodiment of Figure 2, a
further line 5 is also connected to the analog/digital converter 2 and constitutes the output line of a current sensor 6 which senses the current passing through the unit TR2 (and hence the value of the current Ic which passes through the injector L when it is driven by the unit TR2). - The
processing unit 4 is intended to control the operation of three timers T1, T2 and T3. - The timer T1 pilots the unit TR1, whilst the outputs of the timers T2 and T3 converge at an OR-type logic gate 7 whose output in turn pilots the unit TR2.
- The
processing unit 4, as well as the timers T1, T2 and T3, the converter 2 and the logic gate 7, may to advantage be integrated, even partially, in a microprocessor circuit, for example, as respective functions thereof. - The operation of the device will now be described (with reference to both Figure 1 and Figure 2) with the aid of the time graphs of Figure 3. In these time graphs, it is assumed that the output signals of the timers T1, T2 and T3 can be brought selectively, as a result of a corresponding signal output by the
unit 4, from a "low" or "0" logic level to a high or "1" logic level which can cause the activation of the units TR1 and TR2. - More precisely, the time graphs of Figure 3 relate to a single fuel-injection operation started by the unit 4 (
time 0 of the time scale on the abscissa) as a result of the receipt of a synchronisation signal generated, according to known criteria, on the input line S. - At the start of the injection operation, that is, when the current Ic is to be brought to its peak level Ip, the
unit 4 activates the timer T2 causing the activation of the power unit TR2, so that, in practice, the injector L is connected between the battery voltage Vb and earth. - The duration of the interval t₁ is determined by the unit 4 (by means of a simple calculation algorithm stored therein) in dependence on the battery voltage (Vb) which the
unit 4 reads by means of the converter 2. - In brief, this is an open-loop control system: if the voltage Vb (which may vary with the charge level of the battery) is known and the desired maximum current level Ip (for example, 4 A) is known, the duration of the time interval t₁ necessary to reach that current level can be calculated. In general, if Vb drops, it will be necessary to increase the duration of the interval t₁.
- Naturally, it is also possible to use closed-loop control systems, as in the solution shown in Figure 2, in which the converter 2 also supplies the
unit 4 with an indication of the current Ic at any time so that threshold operations, etc. can be carried out in order to achieve an optimal final result. - At the end of the interval t₁, the timer T2 is deactivated and the timers T1 and T3 are also kept deactivated. Under these conditions, both the units TRl and TR2 are deactivated (that is, cut off) so that the injector S is discharged through the Zener diode DZ with a rapid decrease in the intensity of the current Ic which falls to the holding value Im.
- When the intensity Ic reaches the value Im, which takes place during the interval t₂ (whose duration can easily be calculated by the
unit 4 on the basis of the battery voltage Vb, the duration of t₁ and the value of Im to be attained), theunit 4 simultaneously activates the timer T1 (thus activating TR1 and hence the feedback circuit around the load S), whilst the timer T3 (like the unit TR2 controlled thereby through the gate 7) is activated in a pulsed manner, that is, at a fixed frequency (for example 20 KHz) with a selectively variable duty-cycle. - The current can thus be recirculated slowly through the diode Dl (the unit TR1 being made conductive) and, at the same time, the value of the current Ic flowing through the load L is stabilised around an average level (Im) whose value depends on the duty-cycle set by the timer T3.
- In general (see the time interval t₃ of the graph of Figure 3d), the current value Ic increases when the unit TR2 is conducting and decreases when the unit TR2 is cut off.
- This stage is maintained continuously throughout the injection interval t₃.
- In particular, in the solution according to Figure 2, the current signal detected by the sensor 6 and transferred to the
unit 4 by means of the converter 2 enables a fine adjustment of the current. - Upon completion of the fuel injection (at the end of the interval t₃), the
unit 4 once again switches off the timers T1 and T3 and cuts off the units TR1 and TR2, thus facilitating the rapid discharge of the load L through the Zener dioode nz with a consequent rapid fall in the intensity of the current Ic to zero (interval t₄). - With reference again to the stage t₃, it can be noted that, given the high frequency (e.g. 20 KHz) of the chopper effect on the timer T3 (and hence on the unit TR2), the injector S integrates the current which is stabilised, so to speak, around the desired average current Im. In particular, the frequency selected is high enough to ensure that the ripple of the average value satisfies the specification (that the ripple is below a given threshold). For this purpose also, the duty-cycle generated is varied by the
unit 4 in dependence on the battery voltage Vb (detected by means of the converter 2) and on the characteristics of the injector L. - It can be seen from the foregoing description that, from a strictly logical point of view, the timers T2 and T3 (which are intended to be activated alternately) could be combined in a single timer element. The circuit described above, however, may be advantageous in terms of simplicity of execution.
- Naturally, the principle of the invention remaining the same, the details of construction and forms of embodiment may be varied widely with respect to those described and illustrated, without thereby departing from the scope of the present invention.
Claims (9)
1. A control device for fuel injectors (L) for internal combustion engines, characterised in that it comprises:
- first (TR1) and second (TR2) power units which can be connected to an injector (L) in an arrangement such that they recirculate the current (D1) and control the intensity (Ic) of the current flowing through the injector (L), respectively, and
- piloting means (2 to 7; T1, T2, T3) which activate the first (TR1) and second (TR2) power units and can be activated selectively (4) so that, for each injection operation, they effect an operating sequence comprising in order:
- the activation of the second power unit (TR2) with the first power unit (TRI) unit deactivated, causing the intensity of the current (Ic) flowing through the injector (L) correspondingly to increase to a maximum level (Ip),
- the deactivation of both the first (TRl) and the second (TR2) power units with a corresponding drop in the intensity of the current (Ic) flowing through the injector (S) to a lower level, the holding level (Im),
- the activation of the first power unit (TR1) and the simultaneous intermittent activation of the second unit (TR2) so as to cause a certain recirculation of current through the first power unit (TR1) and to hold the intensity of the current (Ic) flowing through the injector (L) at the holding level (Im), and
- the deactivation of both the first (TR1) and the second (TR2) power units with a consequent drop in the intensity of the current (Ic) flowing through the injector.
- first (TR1) and second (TR2) power units which can be connected to an injector (L) in an arrangement such that they recirculate the current (D1) and control the intensity (Ic) of the current flowing through the injector (L), respectively, and
- piloting means (2 to 7; T1, T2, T3) which activate the first (TR1) and second (TR2) power units and can be activated selectively (4) so that, for each injection operation, they effect an operating sequence comprising in order:
- the activation of the second power unit (TR2) with the first power unit (TRI) unit deactivated, causing the intensity of the current (Ic) flowing through the injector (L) correspondingly to increase to a maximum level (Ip),
- the deactivation of both the first (TRl) and the second (TR2) power units with a corresponding drop in the intensity of the current (Ic) flowing through the injector (S) to a lower level, the holding level (Im),
- the activation of the first power unit (TR1) and the simultaneous intermittent activation of the second unit (TR2) so as to cause a certain recirculation of current through the first power unit (TR1) and to hold the intensity of the current (Ic) flowing through the injector (L) at the holding level (Im), and
- the deactivation of both the first (TR1) and the second (TR2) power units with a consequent drop in the intensity of the current (Ic) flowing through the injector.
2. A device according to Claim 1, characterised in that the first (TR1) and second (TR2) power units are constituted by solid-state switches, such as bipolar or MOSFET power transistors.
3. A device according to Claim 1 or Claim 2, characterised in that the first power unit (TR1) has an associated recirculation diode (D₁) for the passage of the current which is recirculated from the injector (L) and flows through the first power unit (TR1) when that power unit (TR1) is activated.
4. A device according to any one of Claims 1 to 3, characterised in that a Zener diode (DZ) is associated with the second power unit (TR2) for faciliting the rapid discharge to earth of the current (Ic) flowing through the injector (L).
5. A device according to Claims 2, 3 and 4, characterised in that it includes, interposed between the supply voltage (Vb) and the earth of the device (1), two electrical branch circuits constituted respectively by:
- the first power unit (TRI) and the respective recirculation diode (Dl) in parallel with the injector (L), and
- the second power unit (TR2) in parallel with the Zener diode (DZ).
- the first power unit (TRI) and the respective recirculation diode (Dl) in parallel with the injector (L), and
- the second power unit (TR2) in parallel with the Zener diode (DZ).
6. A device according to Claim 1, characterised in that the piloting means (4 to 7; T1, T2, T3) comprise:
- at least one detector element (2) sensitive to the level of the supply voltage (Vb) of the device (1),
- timer means (T2) for activating the second power unit (TR2) for a predetermined time interval (t₁) with the first power unit (TR1) deactivated, with a consequent increase in the intensity of the current (Ic) flowing through the injector (S) to the maximum level (Ip), and
- control means (4) which can act on the timer means (T2) selectively to vary the duration of the predetermined time interval (t₁) generally in inverse proportion to the level of the supply voltage (Vb)
- at least one detector element (2) sensitive to the level of the supply voltage (Vb) of the device (1),
- timer means (T2) for activating the second power unit (TR2) for a predetermined time interval (t₁) with the first power unit (TR1) deactivated, with a consequent increase in the intensity of the current (Ic) flowing through the injector (S) to the maximum level (Ip), and
- control means (4) which can act on the timer means (T2) selectively to vary the duration of the predetermined time interval (t₁) generally in inverse proportion to the level of the supply voltage (Vb)
7. A device according to Claim 1 or Claim 6, characterised in that it includes:
- at least one detector element (2) sensitive to the level of the supply voltage (Vb) of the device (1),
- intermittence means (T3) which can vary selectively the duty-cycle of the function of the intermittent activation of the second power unit (TR2), and
- control means (4) which can act on the intermittence means (T3) selectively to vary the duty-cycle generally in inverse proportion to the level of the supply voltage (Vb).
- at least one detector element (2) sensitive to the level of the supply voltage (Vb) of the device (1),
- intermittence means (T3) which can vary selectively the duty-cycle of the function of the intermittent activation of the second power unit (TR2), and
- control means (4) which can act on the intermittence means (T3) selectively to vary the duty-cycle generally in inverse proportion to the level of the supply voltage (Vb).
8. A device according to any one of the preceding Claims 1 to 7, characterised in that it includes:
- a timer element (T1) for selectively activating the first power unit (TR1), and
- at least one further timer element (TR2, TR3) for selectively activating the second power unit (TR2).
- a timer element (T1) for selectively activating the first power unit (TR1), and
- at least one further timer element (TR2, TR3) for selectively activating the second power unit (TR2).
9. A device according to Claim 8, characterised in that it comprises first (T2) and second (T3) further timer elements for activating the second power unit (TR2), the first (T2) and second (T3) further timer elements being interconnected to activate the second power unit (TR2) according to a general logic sum configuration (7)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT67968A IT1238517B (en) | 1989-11-07 | 1989-11-07 | PILOTING DEVICE FOR INJECTORS, ESPECIALLY FOR FUEL SUPPLY IN PETROL ENGINES |
IT6796889 | 1989-11-07 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0427127A1 true EP0427127A1 (en) | 1991-05-15 |
Family
ID=11306814
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900121007 Withdrawn EP0427127A1 (en) | 1989-11-07 | 1990-11-02 | A control device for fuel injectors |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0427127A1 (en) |
IT (1) | IT1238517B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014020287A (en) * | 2012-07-18 | 2014-02-03 | Denso Corp | Fuel injection control device |
SE2150641A1 (en) * | 2021-05-20 | 2022-11-21 | Scania Cv Ab | Method and circuitry for controlling discharge of a solenoid valve |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US453818A (en) * | 1891-06-09 | William henry murray | ||
FR2345595A1 (en) * | 1976-03-26 | 1977-10-21 | Bosch Gmbh Robert | INSTALLATION FOR THE CONTROL, WITH A REGULATED CURRENT, OF ELECTROMAGNETIC MANEUVERS |
US4213181A (en) * | 1978-06-22 | 1980-07-15 | The Bendix Corporation | Energy dissipation circuit for electromagnetic injection |
US4536818A (en) * | 1984-03-02 | 1985-08-20 | Ford Motor Company | Solenoid driver with switching during current decay from initial peak current |
US4631628A (en) * | 1983-06-08 | 1986-12-23 | Chrysler Motors Corporation | Electronic fuel injector driver circuit |
-
1989
- 1989-11-07 IT IT67968A patent/IT1238517B/en active IP Right Grant
-
1990
- 1990-11-02 EP EP19900121007 patent/EP0427127A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US453818A (en) * | 1891-06-09 | William henry murray | ||
FR2345595A1 (en) * | 1976-03-26 | 1977-10-21 | Bosch Gmbh Robert | INSTALLATION FOR THE CONTROL, WITH A REGULATED CURRENT, OF ELECTROMAGNETIC MANEUVERS |
US4213181A (en) * | 1978-06-22 | 1980-07-15 | The Bendix Corporation | Energy dissipation circuit for electromagnetic injection |
US4631628A (en) * | 1983-06-08 | 1986-12-23 | Chrysler Motors Corporation | Electronic fuel injector driver circuit |
US4536818A (en) * | 1984-03-02 | 1985-08-20 | Ford Motor Company | Solenoid driver with switching during current decay from initial peak current |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, vol. 9, no. 67 (M-366)[1790], 27th March 1985; & JP-A-59 200 024 (NIHON DENSHI) 13-11-1984 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014020287A (en) * | 2012-07-18 | 2014-02-03 | Denso Corp | Fuel injection control device |
US9228526B2 (en) | 2012-07-18 | 2016-01-05 | Denso Corporation | Fuel injection controller |
SE2150641A1 (en) * | 2021-05-20 | 2022-11-21 | Scania Cv Ab | Method and circuitry for controlling discharge of a solenoid valve |
WO2022245269A1 (en) * | 2021-05-20 | 2022-11-24 | Scania Cv Ab | Method and circuitry for controlling discharge of a solenoid valve |
SE544931C2 (en) * | 2021-05-20 | 2023-01-10 | Scania Cv Ab | Method and circuitry for controlling discharge of a solenoid valve |
Also Published As
Publication number | Publication date |
---|---|
IT8967968A1 (en) | 1991-05-07 |
IT8967968A0 (en) | 1989-11-07 |
IT1238517B (en) | 1993-08-18 |
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