EP2662554A1 - Treiberschaltung für ein Magnetventil - Google Patents

Treiberschaltung für ein Magnetventil Download PDF

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Publication number
EP2662554A1
EP2662554A1 EP12464009.5A EP12464009A EP2662554A1 EP 2662554 A1 EP2662554 A1 EP 2662554A1 EP 12464009 A EP12464009 A EP 12464009A EP 2662554 A1 EP2662554 A1 EP 2662554A1
Authority
EP
European Patent Office
Prior art keywords
cmp
resistor
input terminal
current
comparator
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Withdrawn
Application number
EP12464009.5A
Other languages
English (en)
French (fr)
Inventor
Dan Bogdan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Continental Automotive GmbH
Original Assignee
Continental Automotive GmbH
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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Priority to EP12464009.5A priority Critical patent/EP2662554A1/de
Publication of EP2662554A1 publication Critical patent/EP2662554A1/de
Withdrawn legal-status Critical Current

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    • 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
    • F02D2041/2048—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit said control involving a limitation, e.g. applying current or voltage limits
    • 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
    • F02D2041/2058—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit using information of the actual current value
    • 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
    • F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
    • 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 invention addresses the problem of magnetic valve current control particularly of high pressure fuel pump valve current control.
  • a high pressure fuel pump valve is an electromechanical device used for fuel pressure regulation by opening and closing the valve pin.
  • the pin is actuated by an electromagnet. It is fully opened by an electric current passing through its coil and closed when the current is shut off. Therefore the valve behaves as an ON-OFF device.
  • the requirements for the valve control circuitry are the following:
  • a driving scheme is employed generally consisting of:
  • the closed loop works as following: when the driver is turned on the coil current increases and this causes an increased voltage drop across the current sensing element. This voltage drop (optionally amplified) is compared against a high threshold and if it is higher the driver is switched off by the logic driven by the comparator. This will cause a current decrease in the load causing a decreased sensed voltage at the comparator. When the voltage falls under a low threshold the comparator will turn the driver on again through the logic. To establish a high and a low threshold usually a comparator with a hysteresis is used.
  • the coil inductance has a significant variation with coil current, pin position and coil temperature. Increased coil current decreases the inductance thus posing a problem either for the peak or hold modes: switching frequency increases in peak mode or ripple increases in hold mode.
  • Tackling the above problems can be done in several ways:
  • a driving circuit for a magnetic valve comprises a coil of the valve and serially connected therewith at least one switching element, the control input of the at least one switching element being connected with the output terminal of a comparator with variable hysteresis a measuring input terminal of which being arranged to be supplied with a signal being representative for a current through the coil, and a control input terminal of which being arranged to be supplied with a variable threshold value.
  • the comparator with variable hysteresis additional to the measuring input terminal and the control input terminal has an output terminal and comprises an operational amplifier having an non-inverting input terminal, an inverting input terminal and an output terminal, the comparator further comprises a serial connection comprising a first resistor, a second resistor, a third resistor and a control voltage source, the serial connection being connected in parallel to a supply voltage whereby a partial serial connection comprising the second resistor, the third resistor and the control voltage source being connected in parallel to a further switching element and the point of connection between the second and third resistor being a voltage tap, whereby the inverting input terminal of the operational amplifier being connected with the voltage tap and the output terminal of the operational amplifier being connected with the control input terminal of the further switching element.
  • variable threshold value of the control voltage source is the output voltage of a low pass filter arranged to be supplied by a PWM-signal.
  • the PWM-signal can be supplied by a microprocessor.
  • the load 70 which represents the coil of a valve is driven by a switching element realized by a PMOS transistor 60 which is connected between a battery voltage V BAT and the load 70 and at the same time by a switching element realized by a NMOS transistor 62 which is connected between the load 70 and via a shunt resistor 22 with ground potential having the battery voltage V BAT as supply.
  • Both transistors 60, 62 are enabled by a Low level on a NEN output of a microcontroller 10.
  • the NEN output of microcontroller 10 is connected via an inverter 43 with the gate of NMOS transistor 62 and with an input of a first OR gate 41.
  • the other input of the first OR gate 41 is connected with the output of a second OR gate 40 a first input of this second OR gate 40 is connected with a NON_HS output of microprocessor 10.
  • a second input of the second OR gate 40 is connected with the output of a variable hysteresis comparator 30 which has a hysteresis.
  • the non-inverting input of comparator 30 is connected via a (optional) shunt amplifier 21 with a connection of shunt resistor 22, the inverting input of comparator 30 being connected via a low-pass-filter 20 with a PWM-output of microprocessor 10.
  • the output of the second OR gate 41 is connected via a high-side-driver 42 with the gate of PMOS transistor 60.
  • the Low level on the NEN output will make the output of the first OR gate 41 output become Low if the other input coming from the second OR gate 40 is also Low.
  • Low output at the fist OR gate 41 is buffered by high-side-driver 42 so the gate of PMOS transistor 60 will be Low, therefore closing the PMOS transistor 60.
  • a Low on the NEN output is applied at the input of low-side-inverter buffer 43, its output becoming High and closing the NMOS transistor 62 by driving its gate in a High level.
  • the coil current I LOAD thus passes through this path, starts rising and causes a voltage drop on shunt resistor 22, proportional to the coil current I LOAD . Further on the voltage drop might pass through the shunt amplifier 21 (amplification factor x10) or can pass on unamplified, yielding a voltage V sense .
  • the amplifier is needed when the voltage drop on 22 is comparable in magnitude to the offset error of the comparator 30, thus reducing the offset's influence.
  • the voltage V sense is then passed at the non-inverting input (+) of the variable hysteresis comparator 30.
  • the inverting input (-) of the comparator 30 is fed with a control voltage V ctrl from the PWM output of the microcontroller 10 via a low pass filter 20. Its cutoff frequency must be low enough that the switching ripple of the PWM signal is filtered out at the control voltage V ctrl at the output of the filter 20.
  • the control voltage V ctrl is used to set the comparator threshold and at the same time to control the hysteresis of the comparator 30.
  • the output V cmp _ out of the comparator 30 is then fed to the first OR gate 40: a Low at output V cmp _ out together with a Low at output NON_HS will cause a Low on the output of the second OR gate 40 thus turning ON PMOS transistor 60 while a High level on one of the output V cmp _ out of the comparator 30 or the NON_HS output will turn off the PMOS transistor 60.
  • the coil current I LOAD is 0A as well as the voltage drop V sense at shunt resistor 22 is 0V while the output V ctrl of low pass filter 20 is at the desired peak phase level (V peak ) which is shown in fig. 3 .
  • the output V cmp _ out of comparator 30 is Low as well as the NON_HS output of microprocessor 10 causing both transistors 60 and 62 to be closed.
  • the coil current I LOAD starts rising, its rise time roughly depending on load parameters (modeled as L L and R L ) and battery voltage V BAT .
  • valve pin is opened which is seen as an I LOAD slope change due to different L L .
  • the coil current I LOAD further rises until the high level of the peak phase I pk_H is reached.
  • the measuring voltage V sense has reached the high threshold V peak of comparator 30 set by the signal V ctrl and the output V ctrl _ out of comparator 30 becomes High. As described above, this causes the PMOS transistor 60 to turn off and the load 70 to be discharged via diode 61 freewheeling path causing a drop of the coil current I LOAD down to the low level I pk _ L of peak phase.
  • the microcontroller 10 changes the duty cycle at the PWM output causing a voltage drop at the output V ctrl of low pass filter 20 down to a value V Hold .
  • the new value V Hold changes the hysteresis thresholds of the comparator 30 causing new current thresholds I hld_H and I hld _ L (by the same mechanism as described for the peak phase) .
  • the coil current I LOAD oscillates in the hold phase between the above mentioned thresholds, determining a new oscillation frequency together with V BAT and the new load parameters (L L and R L ) .
  • V ctrl of the control voltage source dashed line
  • This characteristic of the comparator namely decreased hysteresis with decreased threshold value V ctrl of the control voltage source is useful as the inductance L L of the load 70 changes: the higher the coil current I LOAD the lower the inductance L L .
  • the target is to keep the oscillation frequency under control when the high current I PK _ H of the peak phase will cause a decrease of the inductance L L of the load 70:
  • variable hysteresis comparator 30 is comprised of a classical push pull comparator 31 and a positive voltage feedback path: resistors 32, 33 and 34 and NMOS transistor 35.
  • the value V ctrl of the control voltage source is applied at the inverting input CMP_IN(-), the coil current feedback measuring voltage V sense is applied at the non-inverting input CMP_IN(+) and the output of the comparator 30 is taken from the output CMP_OUT of the comparator 31.
  • the first pin CMP_IN(-) is connected with the inverting input of the comparator 31 via a first resistor 32.
  • the inverting input of the comparator 31 is also connected via a second resistor 33 and a third resistor 34 with a supply voltage V 5v .
  • the connection node between the second and the third resistors 33, 34 is connected via the conducting path of a NMOS transistor 35 as a further switching element with ground potential while the gate of the transistor 35 is connected with the output of comparator 31.
EP12464009.5A 2012-05-11 2012-05-11 Treiberschaltung für ein Magnetventil Withdrawn EP2662554A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12464009.5A EP2662554A1 (de) 2012-05-11 2012-05-11 Treiberschaltung für ein Magnetventil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12464009.5A EP2662554A1 (de) 2012-05-11 2012-05-11 Treiberschaltung für ein Magnetventil

Publications (1)

Publication Number Publication Date
EP2662554A1 true EP2662554A1 (de) 2013-11-13

Family

ID=46465175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12464009.5A Withdrawn EP2662554A1 (de) 2012-05-11 2012-05-11 Treiberschaltung für ein Magnetventil

Country Status (1)

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EP (1) EP2662554A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3013918A1 (fr) * 2013-11-26 2015-05-29 Continental Automotive France Utilisation d'un dispositif electronique de commande d'un moteur a courant continu pour piloter deux charges en appel et maintien
EP2881557A3 (de) * 2013-12-05 2016-03-09 Yamaha Hatsudoki Kabushiki Kaisha Verbrennungsmotor und grätschsitzfahrzeug

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4605983A (en) 1984-01-31 1986-08-12 Lucas Industries Public Limited Company Drive circuits
US4764840A (en) 1986-09-26 1988-08-16 Motorola, Inc. Dual limit solenoid driver control circuit
US4949215A (en) 1988-08-26 1990-08-14 Borg-Warner Automotive, Inc. Driver for high speed solenoid actuator
US5166550A (en) * 1989-12-28 1992-11-24 Fujitsu Limited Comparator circuit with variable hysteresis characteristic
US5748431A (en) 1996-10-16 1998-05-05 Deere & Company Solenoid driver circuit
US5784245A (en) 1996-11-27 1998-07-21 Motorola Inc. Solenoid driver and method for determining solenoid operational status
DE19929749A1 (de) * 1998-07-01 2000-01-13 Zexel Corp Stromsteuertreibersystem
EP0999354A2 (de) * 1998-11-06 2000-05-10 Siemens Automotive Corporation Treiberschaltung für eine Brennstoff-Einspritzdüse mit grossem Betriebsspannungsbereichen
DE10038083A1 (de) * 1999-08-06 2001-03-29 Denso Corp Antriebsvorrichtung für ein elektromagnetisches Ventil mit einer Strombegrenzungsschaltfunktion

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4605983A (en) 1984-01-31 1986-08-12 Lucas Industries Public Limited Company Drive circuits
US4764840A (en) 1986-09-26 1988-08-16 Motorola, Inc. Dual limit solenoid driver control circuit
US4949215A (en) 1988-08-26 1990-08-14 Borg-Warner Automotive, Inc. Driver for high speed solenoid actuator
US5166550A (en) * 1989-12-28 1992-11-24 Fujitsu Limited Comparator circuit with variable hysteresis characteristic
US5748431A (en) 1996-10-16 1998-05-05 Deere & Company Solenoid driver circuit
US5784245A (en) 1996-11-27 1998-07-21 Motorola Inc. Solenoid driver and method for determining solenoid operational status
DE19929749A1 (de) * 1998-07-01 2000-01-13 Zexel Corp Stromsteuertreibersystem
EP0999354A2 (de) * 1998-11-06 2000-05-10 Siemens Automotive Corporation Treiberschaltung für eine Brennstoff-Einspritzdüse mit grossem Betriebsspannungsbereichen
DE10038083A1 (de) * 1999-08-06 2001-03-29 Denso Corp Antriebsvorrichtung für ein elektromagnetisches Ventil mit einer Strombegrenzungsschaltfunktion

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3013918A1 (fr) * 2013-11-26 2015-05-29 Continental Automotive France Utilisation d'un dispositif electronique de commande d'un moteur a courant continu pour piloter deux charges en appel et maintien
WO2015078574A3 (fr) * 2013-11-26 2015-11-26 Continental Automotive France Utilisation d'un dispositif électronique de commande d'un moteur a courant continu pour piloter deux charges en appel et maintien
US9935570B2 (en) 2013-11-26 2018-04-03 Continental Automotive France Use of an electronic device for operating a DC motor to control two peak and hold loads
CN105745424B (zh) * 2013-11-26 2019-02-05 法国大陆汽车公司 使用操控直流发动机的电子设备用于以峰值和保持来操纵两个负载
EP2881557A3 (de) * 2013-12-05 2016-03-09 Yamaha Hatsudoki Kabushiki Kaisha Verbrennungsmotor und grätschsitzfahrzeug

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