EP1788228A2 - System zur Einspritzsteuerung mit Sicherheitsfunktion zum Schutz vor Masseschluss am Verbindungskabel der Injektorspule - Google Patents

System zur Einspritzsteuerung mit Sicherheitsfunktion zum Schutz vor Masseschluss am Verbindungskabel der Injektorspule Download PDF

Info

Publication number
EP1788228A2
EP1788228A2 EP06024219A EP06024219A EP1788228A2 EP 1788228 A2 EP1788228 A2 EP 1788228A2 EP 06024219 A EP06024219 A EP 06024219A EP 06024219 A EP06024219 A EP 06024219A EP 1788228 A2 EP1788228 A2 EP 1788228A2
Authority
EP
European Patent Office
Prior art keywords
value
capacitor
discharge
fuel
threshold value
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
Application number
EP06024219A
Other languages
English (en)
French (fr)
Other versions
EP1788228A3 (de
EP1788228B1 (de
Inventor
Takamichi Kamiya
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.)
Denso Corp
Original Assignee
Denso Corp
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 Denso Corp filed Critical Denso Corp
Publication of EP1788228A2 publication Critical patent/EP1788228A2/de
Publication of EP1788228A3 publication Critical patent/EP1788228A3/de
Application granted granted Critical
Publication of EP1788228B1 publication Critical patent/EP1788228B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02D2041/2003—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
    • F02D2041/202—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
    • F02D2041/2086—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures
    • F02D2041/2093—Output circuits, e.g. for controlling currents in command coils with means for detecting circuit failures detecting short circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D2400/00—Control systems adapted for specific engine types; Special features of engine control systems not otherwise provided for; Power supply, connectors or cabling for engine control systems
    • F02D2400/14—Power supply for engine control systems

Definitions

  • the present invention relates to an apparatus which drives the fuel injectors (referred to in the following simply as injectors) that inject fuel into the cylinders of an internal combustion engine.
  • the invention relates to a fuel injection control apparatus for controlling the opening of each injector by discharging energy through a coil of the injector from a capacitor that has been charged to a high voltage.
  • Types of fuel injection control apparatus whereby the duration of the conduction intervals and conduction timings of current flow through the coil of an injector are controlled such as to control the amounts of fuel that are injected into an internal combustion engine and the durations of the injection intervals.
  • a fuel injection control apparatus has a voltage step-up circuit which performs step-up of a supply voltage and which charges a capacitor (referred to herein as the charge capacitor) to the stepped-up voltage, with the stored high-voltage energy of the charge capacitor being then discharged through an injector coil.
  • a predetermined high peak level of current thereby flows in the injector coil, and the corresponding injector is thereby quickly opened (where "opening” signifies a valve-opening operation whereby fuel is injected by an injector into a cylinder of an internal combustion engine), and thereafter, during the conduction interval of that injector, a fixed level of current is passed through the injector coil, so that a constant injection condition is maintained for that injector.
  • opening signifies a valve-opening operation whereby fuel is injected by an injector into a cylinder of an internal combustion engine
  • a plurality of injectors are provided respectively corresponding to the cylinders of the engine, with that plurality being divided into two groups.
  • This is referred to as the common 2-system method (as described for example in reference document 1).
  • overlap injection method or multiplexed injection
  • injectors belonging to different groups are driven within the same interval.
  • FIG. 5 A specific example of such a fuel injection control apparatus will be described referring to Figs. 5 to 7.
  • the apparatus shown in Fig. 5 is based on a electronic control unit (hereinafter abbreviated to ECU) 100, which controls the conduction intervals and conduction timings of coils 101a, 102a, 103a, 104a that respectively correspond to injectors 101, 102, 103,104 of the four cylinders (respectively designated as the #1 ⁇ #4 cylinders) of a 4-cylinder internal combustion engine, to thereby control the fuel injection quantities and injection timings for each of the cylinders.
  • ECU electronice control unit
  • Each of the injectors 101 ⁇ 104 is a normally-closed type of electromagnetic valve, and each injector becomes opened when a current is passed through the corresponding one of the coils 101a ⁇ 104a. When current flow through the corresponding coil is interrupted, the injector is closed and fuel injection is thereby halted.
  • the injectors 101 ⁇ 104 of the four cylinders are divided into two groups, with each group corresponding to two cylinders.
  • the injectors 101, 103 constitute the No. 1 group, each having one end (the upstream end) of the corresponding injector coil connected to the common terminal COM1 of the ECU 100, while the injectors 102, 104 constitute the No. 2 group, each having the upstream end of the corresponding injector coil connected to the common terminal COM2 of the ECU 100.
  • the downstream ends of the coils 101a ⁇ 104a are connected via the terminals INJ1, INJ2, INJ3, INJ4 of the ECU 100 to respective output terminals of transistors T10, T20, T30, T40.
  • the other terminals of the transistors T10, T20, T30, T40 are connected through resistors R10, R20 (corresponding to respective injector groups) to ground potential. For that reason, a current that flows through transistor T10 or T30 and the coil 101a or 103a of the injectors 101, 103 will be detected as a voltage that appears across the resistor R10.
  • each of the switching elements within the ECU 100 is a MOS FET (metal oxide semiconductor field effect transistor).
  • the ECU 100 also includes, in addition to the resistors R10, R20 and the transistors 10 ⁇ 40, transistors T11,T21, T22, diodes D11, D12, D21,D22, resistors R11, R12, R21, R22, charge capacitor C10, charging circuit (voltage step-up circuit) 30, a drive control circuit 120, a charging circuit 50, and a microcomputer 130 which is made up of a CPU, ROM, RAM, etc.
  • the charging circuit 50 steps up the voltage VB of the vehicle battery, which constitutes the power supply voltage of this example and is a positive voltage with respect to the system ground potential, and the resultant stepped-up voltage is applied to charge the capacitor C10, i.e., to a voltage that is higher than VB.
  • the drive control circuit 120 controls respective transistors in the ECU 100, and also controls the charging circuit 50. Circuit leads that are at ground potential and so are connected to the low potential of the DC power source of the apparatus (e.g., battery) are referred to herein collectively as "the ground line".
  • the microcomputer 130 generates injection command signals TQ1 ⁇ TQ4 corresponding to the respective #1 ⁇ #4 cylinders, based on the engine speed Ne, the accelerator degree of opening ACC, the engine coolant temperature THW, etc., and engine operation information that is detected by respective sensors, and outputs the injection command signals TQ1 ⁇ TQ4 that are supplied to the drive control circuit 120.
  • a current is passed through the corresponding one of the coils 101a ⁇ 104a of the injectors 101 ⁇ 104, whereby that injector becomes opened.
  • the drive control circuit 120 outputs each of the injection command signals TQ1 ⁇ TQ4 to the gate of the corresponding one of the transistors 10 ⁇ 40, i.e., the gate of the transistor corresponding to the cylinder which is predetermined as corresponding to that injection command signal.
  • the injection command signal TQ1 is applied to the gate of the transistor T10
  • the injection command signal TQ2 is applied to the gate of the transistor T20.
  • the charging circuit 50 includes an inductor L00, a transistor T00, and a charging control circuit 110 which drives the transistor T00.
  • the inductor L00 has one end connected to the power supply lead Lp which supplies the battery voltage VB and the other end connected to one output terminal of the transistor T00.
  • a current detection resistor R00 is connected between the other output terminal of the transistor T00 and the ground line.
  • the gate of the transistor T00 is connected to the charging control circuit 110, with the transistor T00 being switched on and off in accordance with the output signal from the charging control circuit 110.
  • One terminal (positive polarity terminal) of the charge capacitor C10 is connected through a reverse current blocking diode D13 to the connection point between the inductor L00 and the transistor T00, while the other terminal (negative polarity terminal) of the capacitor C10 is connected to the connection point between the transistor T00 and the resistor R00.
  • the charging circuit 50 When on/off switching of the transistor T00 is performed, the charging circuit 50 generates a flyback voltage (induced reverse voltage) which is higher than the battery voltage VB, at the connection point between the inductor L00 and the transistor T00, and the capacitor C10 is charged by this flyback voltage, passed through the diode D13. As a result, the capacitor C10 becomes charged to a voltage that is higher than the battery voltage VB.
  • a charge enabling signal produced from the drive control circuit 120, goes to the active level (for example, high level)
  • the charging control circuit 110 performs on/off switching of the transistor T00.
  • the voltage at the positive polarity terminal of the charge capacitor C10 (referred to in the following as the capacitor voltage VC) is used as a monitor value.
  • the capacitor voltage VC attains a predetermined target value (> VB) or the charging enabling signal goes to the inactive level, the transistor T00 is left in the off condition and charging of the capacitor C10 is halted.
  • the transistor T12 is provided for discharging the charge capacitor C10 through the coils 101a, 103a that are connected to the common terminal COM1.
  • the transistor T12 is set on, the positive terminal (high voltage terminal) of the capacitor C10 becomes connected to the common terminal COM1.
  • switch on or “set in the on state” as applied to a switching element such as a FET is to be understood as setting the switching element in a conducting condition, e.g., by applying a suitable potential to the gate electrode of a FET to enable conduction between the drain and source electrodes.
  • the transistor T22 is provided in the ECU 100, for discharging the capacitor C10 through the coils 102a, 104a that are connected to the common terminal COM2.
  • the transistor T22 is set on, the positive terminal of the capacitor C10 becomes connected to the common terminal COM2.
  • the transistor T11 is provided in the ECU 100 for passing a fixed level of current through the coils 101a, 103a that are connected to the common terminal COM1.
  • the coil (101a or 103a) that is connected to the one of the transistors T10 or T30 that is in the on state will receive a flow of current from the power line Lp, through the diode D12, which is a return current diode for control of the current through the coils 101a, 103a.
  • the transistor T11 is switched from the on to the off state, a return current flows in the corresponding one of the coils 101a, 103a.
  • the transistor T21 passes a fixed level of current through the coils 102a, 104a that are connected to the common terminal COM2.
  • the transistors T20, T40 When either of the transistors T20, T40 is in the on state, then if the transistor T21 is set on, the coil (102a or 104a) that is connected to the one of the transistors T20 or T40 that is in the on state will receive a flow of current from the power line Lp, through the done-shot circuit 21.
  • the diode D22 is a return current diode for control of the current through the coils 102a, 104a.
  • the pair of series-connected resistors R11, R12 and the pair of series-connected resistors R21, R22 are respectively connected between the power supply line Lp and the ground line.
  • the connection point between the resistors R11, R12 is connected to the common terminal COM1, while the connection point between the resistors R21, R22 is connected to the common terminal COM2.
  • the resistors R11, R12, R21, R22 are provided for setting the voltage levels of the common terminals COM1, COM2, when these terminals are in the open-circuit (i.e., floating) state.
  • each of the resistors R11, R12, R21, R22 are of identical value, so that when the common terminals COM1, COM2 are in the open-circuit state, each of these terminals will be fixed at a potential of VB/2.
  • the drive control circuit 120 sets the charging enabling signal (supplied to the charging control circuit 110) at the active level during each interval in which discharge current is not being supplied from the capacitor C10 to the coils 101a ⁇ 104a (i.e., while the transistors T12, T22 are both in the off state).
  • the charging circuit 50 is thereby activated, so that the charge voltage of the capacitor C10 increases from the voltage VC to reach the target voltage (as shown by the stage labeled "VC" in the timing diagrams of Fig. 6).
  • the drive control circuit 120 sets the transistor T12 on, concurrent with either of the injection command signals TQ1, TQ3 (corresponding to the No. 1 group) going from the low to the high level.
  • TQx the designation "TQx" will be used to indicate an injection command signal which goes to the high level.
  • the one of the transistors T10, T30 that corresponds to the injection command signal TQx is set to the on state, while in addition the capacitor voltage VC is applied to the common terminal COM1, and the energy stored in the capacitor C10 is then discharged through the injector coil that corresponds to the injection command signal TQx.
  • a high level of current thereby begins to flow through that coil, and as result of that current flow, the injector corresponding to the injection command signal TQx becomes opened.
  • the designation "ICOM1" indicates the current that flows through the common terminal COM1, i.e., that flows in the coil of the injector that corresponds to the injection command signal TQx.
  • the drive control circuit 120 After the transistor T12 has been turned on, the drive control circuit 120 detects the level of current flowing in the aforementioned coil, based on the voltage appearing across the resistor R10. As shown in Fig. 6, the drive control circuit 120 turns the transistor T12 off, when the level of current in that coil (injector current) attains a predetermined target value, designated herein as ip.
  • the drive control circuit 120 continues to detect the current flowing in the aforementioned coil, based on the voltage across the resistor R10. During the interval which elapses until the injection command signal TQx goes from the high to the low level, the drive control circuit 120 performs on/off switching of the transistor T11 such as to maintain the detected level of current at a constant value which is close to, but lower than, the target value ip.
  • the drive control circuit 120 performs control for regulating the current flowing in the aforementioned coil to a constant value, by switching the transistor T11 on when the coil current falls below a lower threshold value designated as icL, and switching off the transistor T11 when the coil current exceeds a threshold value designated as icH.
  • a threshold value designated as icH As a result, when the current flowing in the coil departs from the target value ip to fall below the lower limit threshold value icL, then thereafter on/off switching of the transistor T11 is repetitively performed, so that the average value of the coil current is held approximately midway between the upper and lower threshold values icH and icL.
  • Fig. 6 assumes the case in which the upper limit threshold value icH and lower limit threshold value icL are each constant, so that the current flowing the coil is held at a single fixed value.
  • Fig. 7 (described hereinafter), concerning the current ICOM2 that flows in the common terminal COM2 (shown in the fourth stage in Fig. 7) it is also possible to perform control whereby the coil current is controlled to a first fixed value until a fixed interval has elapsed since the flow of current through the coil was started, and whereby thereafter, until the injection command signal TQx goes to the low level (i.e., until current flow through the coil is terminated) the coil current is controlled to be held at a second fixed value. That is to say, in that case, after a fixed time interval has elapsed following the start of current flow through the coil, the upper and lower threshold values icH and injector coil are respectively changed to values whereby the coil current will be held at the second fixed value.
  • the drive control circuit 120 performs a similar type of control to that of basic operation No. 3, operating on the transistor T22.
  • the drive control circuit 120 sets the transistor T22 in the on state.
  • the one of the transistors T10 ⁇ T40 corresponding to the injection command signal TQx that has gone to the high level is then set in the on state, while at the same time the capacitor voltage VC is applied to the common terminal COM2.
  • the energy stored in the capacitor C10 is discharged through the injector coil that corresponds to the injection command signal TQx, and the corresponding injector is thereby opened.
  • the drive control circuit 120 detects the current flowing in the coil based on the voltage appearing across the resistor R20, and turns off the transistor T22 when the detected current attains the target value ip.
  • the drive control circuit 120 also performs similar control to that of the basic operation No. 4 described above, with respect to the transistor T21.
  • the drive control circuit 120 detects the coil current based on the voltage across the resistor R20. In the interval until the injection command signal TQx goes from the high to the low level, the drive control circuit 120 performs on/off switching of the transistor 21 such that the detected value of current attains a fixed value that is less than the target value ip.
  • a fixed level of current is fixed through the coil of the injector (of group No. 2) that corresponds to the injection command signal TQx, with the current being passed from the supply line Lp through the transistor T21 and diode D21. That injector is thereby held in the open state.
  • the fail safe functions that are executed by the ECU 100 will be described referring to the timing diagrams of Fig. 7.
  • the fail-safe functions described in the following are implemented respectively separately for each of the groups of injectors, however for brevity of description only the fail-safe functions applied to the No. 1 group (made up of injectors 101, 103) will be described.
  • Fig. 7 The fail-safe functions described in the following are implemented respectively separately for each of the groups of injectors, however for brevity of description only the fail-safe functions applied to the No. 1 group (made up of injectors 101, 103) will be described.
  • ICOM1 denotes the current flowing through the common terminal COM1
  • ICOM2 denotes the current flowing through the common terminal COM2
  • VOCM1 denotes the voltage appearing at the common terminal COM1
  • VCOM2 the voltage at the common terminal COM2
  • VINJ1 denotes the voltage at the INJ1 terminal
  • VINJ2 denotes the voltage at the INJ2 terminal.
  • the drive control circuit 120 judges whether the level of the discharge current flowing from the capacitor C10 exceeds an overcurrent judgement threshold value Ith. If the current is found to exceed Ith, then the drive control circuit 120 forcibly sets the discharge transistor T12 in the off state.
  • the drive control circuit 120 detects the level of discharge current as the value of return current that flows to the capacitor C10 through the resistor R00 from the ground line during discharge, i.e., with the discharge current detected as the voltage appearing across the resistor R00.
  • a suitable circuit configuration for implementing the first fail-safe function is described for example in Fig. 2 of reference document 1.
  • the drive control circuit 120 performs the first fail-safe function in a similar manner for the discharge control transistor T11. That is to say, when either of the injection command signals TQ1, TQ3 goes from the low to the high level, the drive control circuit 120 detects the level of current flowing in the transistor T11. If the current exceeds an overcurrent judgement threshold value Ith', then the transistor T11 is forcibly set in the off state. Hence if a short-circuit to ground occurs at the common terminal COM1, so that the current flow through the transistor T11 exceeds the overcurrent judgement threshold value Ith', the transistor will be forcibly turned off.
  • the current that flows in a coil from the capacitor C10 is detected by using the resistor R10, so that an excessive level of current that results from a short-circuit to ground at the common terminal COM1 cannot be detected. Hence the transistor T11 will not be protected.
  • the microcomputer 130 With the No. 1 basic operation applied to the No. 1 group, the microcomputer 130 counts the number of times that the discharge current of the capacitor C10 exceeds the overcurrent judgement threshold value Ith (as judged by the first fail-safe function). When it is judged that the number of times exceeds a prescribed value k, the microcomputer 130 then inhibits the outputting of injection command signals TQ1 and TQ3 (TQ1, TQ3 are each held at the low level) so that operations for opening the injectors 101, 103 of the No. 1 group are halted.
  • the respective voltages appearing at the common terminals COM1 and COM2 are supplied to the drive control circuit 120.
  • the drive control circuit 120 compares the magnitude of each of these voltages with a threshold value Vth, which is used for judging whether or not there is a short-circuit to ground at either of the common terminals COM1 or COM2, and outputs monitor signals M1, M2 which express the respective comparison results obtained for the common terminals COM1 and COM2, with the monitor signals M1, M2 being supplied to the microcomputer 130.
  • the threshold value Vth may be set as 1 ⁇ 4 of the battery voltage VB.
  • the monitor signal M1 becomes set at the high level, while if the voltage at the common terminal COM2 falls below the threshold value Vth, the monitor signal M2 becomes set at the high level. Otherwise, each of the monitor signals M1, M2 remains at the low level.
  • the microcomputer 130 After changing an injection command signal TQ1 or TQ3 (i.e., corresponding to the No. 1 group) from the high to the low level, the microcomputer 130 acquires the level of the monitor signal M1 during the interval that elapses until the next point at which one of the injection command signals TQ1 or TQ3 goes to the high level. If the monitor signal M1 is at the high level (i.e., VCOM1 ⁇ Vth), a counter is incremented.
  • the monitor signal M1 is at the high level in spite of the fact that each of the injection command signals TQ1 and TQ3 are at low level and the transistors T10, T30 are in the off state, then this may signify that there is a short-circuit to ground at the common terminal COM1. Specifically, it indicates that immediately previously, when one of the signals TQ1, TQ3 was at the high level, the first fail-safe function (for the No. 1 group) judged that the discharge current of the capacitor C10 exceeded the threshold value Ith.
  • the microcomputer 130 increments the aforementioned counter by one. If the microcomputer 130 judges that the count value of this counter has reached the prescribed value k, then it inhibits further processing for outputting the injection command signals TQ1, TQ3, i.e., each of these signals is held at the low level.
  • the injection command signals TQ1, TQ3 for the No. 1 group will be outputted three times following the time point at which the short circuit condition arises, and thereafter, outputting of the injection command signals TQ1, TQ3 will cease. In that way, it can be ensured that damage to the circuit elements such as for example T11 and T12, as a result of the short-circuit to ground of the common terminal COM1, can be prevented.
  • each time either of the injection command signals TQ2, TQ4 goes from the low to high level a decision is made as to whether the discharge current from the capacitor C10 exceeds the threshold value Ith. If the threshold value is exceeded then the transistor T22 is forcibly set in the off condition. The number of times that the discharge current from the capacitor C10 is judged to have exceeded the threshold value Ith is counted, and when that number of times is found to have attained the prescribed value k, then thereafter, outputting of the injection command signals TQ2, TQ4 is inhibited by the microcomputer 130.
  • the time points indicated by the upwardly-directed arrows, designated as ("monitor timings for short-circuit detection" shown in the fifth and sixth stages (the VCOM1 and VCOM2 stages) are points at which the microcomputer 130 acquires the respective states of the monitor signals M1, M2.
  • the capacitor voltage VC may become lower than a level which enables fuel injection operation to be performed normally for the injectors of the No. 2 group, during the interval that elapses from the time point at which outputting of the injection control signals TQ1, TQ3 becomes inhibited by the second fail-safe function.
  • the injectors 102, 104 whose coils are connected to the common terminal COM2 (which does not have a short-circuit to ground) would not be driven normally. Thus it would not be possible to continue to operate the engine.
  • the prescribed value k for the second fail-safe function were to be set as 1, and a short-circuit to ground were to occur momentarily at the common terminal COM1 (assuming in this example that the short-circuit occurs only during a time approximately corresponding to a single fuel injection operation) then as a result of the operation of the second fail-safe function, control of driving the injectors 101, 103 belonging to the No. 1 group (i.e., whose coils are connected to the common terminal COM1) would be inhibited. As a result, fuel injection would be performed only by the injectors 102, 104 of the No. 2 group, so that deterioration of the driveability of the vehicle could occur. This is clearly illustrated by the lowermost timing diagram in Fig. 8, showing the variations in capacitor voltage VC.
  • short-circuit to ground at a common terminal, refers to a short-circuit to ground that occurs at the terminal itself, or in a connecting lead which is connected to that common terminal.
  • an objective to provide an improved fuel injection control apparatus that is applicable to an internal combustion engine in which a charge capacitor is used for controlling the opening of injectors in each of a plurality of groups of injectors, with charge current being supplied from the capacitor to the respective groups via respective corresponding switching elements of the groups, and whereby it can be ensured that when a short-circuit to ground occurs in a connecting lead or connection terminal of one group of injectors, operation of the remaining group(s) of injectors will remain possible, and to achieve this while enabling the capacitance value of the charge capacitor to be made smaller than has been possible in the prior art.
  • this is achieved by reducing successive amounts of capacitor charge that are dissipated through such a short-circuit to ground, in respective injector drive operations, so long as such a short-circuit condition continues.
  • a short-circuit to ground occurs in a connecting lead or connection terminal of a group of injectors, and is detected when the drive current of an injector of the group is judged to exceed a regular (i.e., normal) threshold value, then for each of a fixed number of subsequent judgement operations, the threshold value is lowered.
  • the supplying of capacitor discharge current is more rapidly interrupted (while the short-circuit condition continues) than when the regular threshold value is utilized, so that smaller amounts of charge are lost due to the short-circuit.
  • a fuel injection control apparatus basically differs from the prior art, such as that of the example described in detail hereinabove, with respect to the following:
  • the invention thereby enables a capacitor to be utilized as the charge capacitor that has a lower capacitance value than has been possible in the prior art, while ensuring that a vehicle powered by such an internal combustion engine can be driven at least in a "limp home" mode in the event that a short-circuit to ground occurs at only one of a plurality of common terminals that supply respective groups of fuel injectors.
  • Fig. 1 shows the configuration of an embodiment of a fuel injection control apparatus according to the present invention.
  • the embodiment includes four injectors 101 ⁇ 104 that are respectively provided for the #1 ⁇ #4 cylinders of an engine, and an ECU 1 for controlling the conduction intervals and conduction timings of the coils 101a ⁇ 104a of the injectors 101 ⁇ 104 respectively.
  • components corresponding to components in the example of Fig. 5 are designated by identical reference numerals to those of Fig. 5, and further description of these will be omitted.
  • the capacitor C10 is an aluminum electrolytic capacitor.
  • the ECU 1 of this embodiment differs with respect to the first and second fail-safe functions.
  • a drive control circuit 3 is utilized in place of the drive control circuit 120 of Fig. 5.
  • the drive control circuit 3 performs the same basic operations (No. 1 to No. 6) described hereinabove.
  • the drive control circuit 3 of the ECU 1 of this embodiment includes discharge control sections 5 and 7, respectively corresponding to the two groups of injectors 101 ⁇ 104.
  • the discharge control section 5 is a circuit block for driving the transistor T12, to control discharging of the capacitor C10 through the coils 101a, 103a of the No. 1 group of injectors (injectors 101, 103).
  • circuits in the discharge control section 5 implement the first fail-safe function with respect to the No. 1 group, to protect the transistor T12 against excessive current flow.
  • the discharge control circuit 7 is a circuit block for driving the transistor T22, to control discharging of the capacitor C10 through the coils 102a, 104a of the No. 2 group of injectors (injectors 102, 104), and also for performing the basic operation No. 5 described above.
  • Circuits in the discharge control section 5 implement the first fail-safe function with respect to the No. 2 group, to protect the transistor T22 against excessive current flow, and the discharge control section 5 also performs the basic operation No. 5 Since each of the discharge control sections 5 and 7 have an identical configuration, only the discharge control section 5 will be described in detail in the following.
  • the discharge control section 5 is made up of a discharge control signal generating circuit 9, NOR gate 11, latch circuits 13 and 15, a comparator 17, a counter 19, one-shot circuits 21 and 23, an inverter 25, a PNP transistor 27, a zener diode 29, and resistors 31 to 36.
  • the discharge control signal generating circuit 9 performs the basic operation No. 3 described above, outputting a low-active signal as a discharge control signal for setting the transistor T12 in the on state. That is to say, of the signals injection command signals TQ1 ⁇ TQ4 produced from the microcomputer 130, when either of the injection command signals TQ1, TQ3 goes from the low to the high level, the discharge control signal generating circuit 9 changes the discharge control signal from the high level to the low level, to thereby set the transistor T12 in the on state.
  • the discharge control signal generating circuit 9 detects a flow of current through either of the coils 101a, 103a (based on the voltage appearing across the resistor R10), it changes the discharge control signal from the low to the high level when the level of detected current (injector current) reaches the target value ip.
  • the output signal from the discharge control signal generating circuit 9 and the output signal (Q terminal output) from the latch circuit 13 are inputted to the NOR gate 11, and the output signal from the NOR gate 11 is applied to the gate of the transistor 12, as a high-active drive signal.
  • the transistor T12 becomes set in the on state, and the discharge control signal generating circuit 9 executes the basic operation No. 3 described above.
  • Sections of the discharge control section 5 other than the discharge control signal generating circuit 9 serve to implement the first fail-safe function, for protecting the transistor T12 against excessive current flow.
  • the junction of the negative polarity terminal of the capacitor C10 and the resistor R00 is connected via the series-connected resistor pair 31, 32 to the inverting input terminal (- input terminal) of the comparator 17, and in addition, the inverting input terminal of the comparator 17 is pulled up by the resistor 33 to the fixed voltage VD (for example, 5 V).
  • VD fixed voltage
  • a zener diode 29 is connected between the junction of the series-connected resistors 31, R32 and the ground line, for protecting the comparator 17.
  • the anode of the zener diode 29 is connected to the ground side.
  • the non-inverting input terminal (+ terminal) of the comparator 17 is connected to the reference voltage Vref, which is formed by voltage dividing the fixed voltage VD, by the resistors 34 and 35.
  • the output terminal of the comparator 17 is connected to the respective set terminals (S) of the latch circuits 13 and 15.
  • the output signal from the one-shot circuit 21 is applied to the reset R terminal of the latch circuit 13.
  • the one-shot circuit 21 produces a pulse signal at the high level, during a brief time interval.
  • the latch circuit 13 becomes reset each time that either of the injection command signals TQ1, TQ3 changes to the high level.
  • the output signal from the counter 19 is inputted to the reset (R) terminal of the latch circuit 15.
  • the counter 19 receives the pulse signal from the one-shot circuit 21 as a clock input signal, and performs counting of these pulses. When the count reaches the value N, where N is a plural integer, the output from the counter 19 goes to the high level for a brief interval, and that signal is applied to reset the latch circuit 15. When the Q output signal from the latch circuit 15 goes from the low to high level, the one-shot circuit 23 outputs a pulse signal to the reset terminal of the counter 19, to reset the counter 19.
  • the output signal from the latch circuit 15 is supplied via the inverter 25 to the base of the PNP transistor 27.
  • the PNP transistor 27 becomes set on, so that the opposite terminal of the resistor 36 from the terminal that is connected to the junction of the resistors 34, 35 becomes connected to the fixed voltage VD, applied through the PNP transistor 27.
  • the reference voltage Vref that is inputted to the non-inverting input terminal of the comparator 17 becomes changed from the aforementioned voltage-divided value Vr1 (obtained by the resistors 34, 35 operating on the fixed voltage VD) to a voltage Vr2 (> Vr1) that is obtained by voltage division of the fixed voltage VD, performed by a resistive voltage divider formed by the parallel combination of the resistors 34 and 36 connected in series with the resistor 35.
  • the input voltage of the comparator 17 will never fall to the level of voltage Vr1.
  • the count value of the counter 19 is initialized to a count that is greater than N, when operation of the ECU 1 is started. Hence, during normal operation, the output from the counter 19 will remain at the low level, so that the latch circuit 15 will remain in the reset state, and the PNP transistor 27 will be held in the off state, so that the reference voltage Vref of the comparator 17 will be set at Vr1.
  • Fig. 3 illustrates an example in which N is 2.
  • the discharge control section 5 performs the following.
  • the reference voltage of the comparator 17 remains at the higher value Vr1, so that the overcurrent judgement threshold value Ith is at the regular (high) level IH.
  • the comparator 17 judges whether or not the discharge current from the capacitor C10 exceeds the overcurrent judgement threshold value Ith. If Ith is judged to be exceeded, the transistor T12 is forcibly set in the off state, and then during each of the succeeding (N - 1) judgement operations, the overcurrent judgement threshold value Ith is set at the value IL, that is lower than the regular value IH.
  • the overcurrent judgement threshold value Ith is set at the lower value IL during each of (N - 1) of a total of N operations for judging successive levels of charge current supplied to the injectors of the No. 1 group.
  • N is equal to 2.
  • the discharge control circuit 7, corresponding to the No. 2 group, has the same configuration as the discharge control section 5 described above. However in the discharge control circuit 7, a discharge control signal generating circuit 9 and a one-shot circuit 21 each receive as inputs the injection command signals TQ2, TQ4, and the output signal from the NOR gate 11 of the discharge control circuit 7 is applied as a drive signal to the gate of the transistor T22.
  • the constant-current control sections 37 and 39 in the drive control circuit 3 are circuit blocks that control the transistors T11 and T21, which correspond to those shown in the drive control circuit 120 of Fig. 5 ??
  • the configuration and operation of the constant-current control sections 37 and 39 will be described in the following.
  • the constant-current control section 37 performs the aforementioned basic operation No. 4, for regulating the current flowing in the coils 101a, 103a of the No. 1 group (i.e., corresponding to the injectors 101, 103) to a constant value.
  • the constant-current control section 37 performs a fail-safe function for overcurrent protection of the transistor T11.
  • the current regulator circuit 39 is a circuit block for regulating the current flowing in the coils 102a, 104a of the No. 2 group (i.e., corresponding to the injectors 102, 104) to a constant value, and also performs a fail-safe function for overcurrent protection of the transistor T21.
  • the constant-current control section 37 is made up of a current regulation control signal generating circuit 41, a OR gate 43, a latch circuit 45, a comparator 47, a one-shot circuit 49, and resistors 51, 52.
  • the current regulation control signal generating circuit 41 performs the basic operation No. 4, and outputs a low-active signal as a current regulation control signal for on/off switching of the transistor T11. That is to say, while either of the injection command signals TQ1, TQ3 is at the high level, the current regulation control signal generating circuit 41 detects the current flowing in the corresponding coil, based on the voltage developed across the resistor R10, and produces an output signal that is switched between the low and high level.
  • That output signal is used as a current control signal, to control the discharge current to a constant value. Specifically, if the detected value of current falls slightly below the target value of current, the output signal of the current regulation control signal generating circuit 41 goes to the low level, to thereby switch on the transistor T11, while if the detected value of current exceeds the target value of current, the output signal of the current regulation control signal generating circuit 41 goes to the high level, to thereby switch off the transistor T11. While both of the injection command signals TQ1, TQ3 are at the low level, the output signal of the current regulation control signal generating circuit 41 remains at the high level.
  • the output signal from the current regulation control signal generating circuit 41 and the output signal (Q output) from the latch circuit 45 are each inputted to the OR gate 43, and the output signal from the OR gate 43 is applied as a low-active drive signal to the gate of the transistor T11, which is a P-channel MOS FET in this embodiment. If the output signal from the latch circuit 45 is at the low level, then when the output signal from the current regulation control signal generating circuit 41 goes to the low level, the transistor T11 is set in the on state. In that way, the current regulation control signal generating circuit 41 performs the aforementioned basic operation No. 4.
  • sections other than the current regulation control signal generating circuit 41 serve to perform overcurrent protection of the transistor T11.
  • a resistor R13 is connected, external to the drive control circuit 3, between the power supply line Lp and the transistor T11, for use in detecting the level of current that flows in the transistor T11.
  • a resistor R23 is connected between the power supply line Lp and the transistor T21, for use in detecting the level of current that flows in the transistor T21.
  • the resistors R13, R23 are omitted from Fig. 5.
  • the voltage appearing at the junction between the resistor R13 and the transistor T11 is applied to the inverting input terminal (- terminal) of the comparator 47.
  • the voltage Vr3 obtained by voltage dividing the supply voltage VD by means of the resistors 51, 52, is inputted as a reference voltage to the non-inverting input terminal (+ terminal) of the comparator 47.
  • the output terminal of the comparator 47 is connected to the set (S) terminal of the latch circuit 45.
  • the latch circuit 45 When the output signal from the comparator 47, applied to the set terminal of the latch circuit 45, goes to the high level, then the latch circuit 45 enters a condition in which its output signal (Q output) is set at the high level.
  • the reset terminal of the latch circuit 45 is coupled to receive the output signal from the one-shot circuit 49, and each time that either of the injection command signals TQ1, TQ3 (corresponding to the No. 1 group) goes from the low to high level, the one-shot circuit 49 outputs a short-duration high level pulse. Hence, the latch circuit 45 becomes reset when either of the signals TQ1, TQ3 becomes high, and is set when the output signal of the comparator 47 becomes high.
  • Sections of the constant-current control section 37 other than the current regulation control signal generating circuit 41 will be described in the following. Firstly, when either of the injection command signals TQ1, TQ3 goes to the high level then since the latch circuit 45 becomes reset by the one-shot circuit 49, the output from the latch circuit 45 goes to the low level. Hence, after either of the injection command signals TQ1, TQ3 goes to the high level, then when the output signal from the current regulation control signal generating circuit 41 goes to the low level, the output signal from the OR gate 43 goes to the low level so that the transistor T11 is set in the on state.
  • the voltage at the inverting input terminal of the comparator 47 goes to the low level.
  • the input voltage of the comparator 47 will never fall to the aforementioned voltage Vr3. Hence the output from the comparator 47 will remain at the low level, so that the latch circuit 45 will be held in the reset state.
  • the output signal from the comparator 47 goes to the high level, so that the latch circuit 45 enters the set state and the output signal of the latch circuit 45 goes to the high level. Due to this, the output signal from the OR gate 43 will go to the low level, irrespective of the state of the output signal from the current regulation control signal generating circuit 41. As a result, the transistor T11 will be forcibly set in the off state, and is thereby protected against damage due to excessive current. This condition will continue until the next occasion when either of the injection command signals TQ1, TQ3 changes from the low to high level.
  • the current regulator circuit 39 (corresponding to the No. 2 group) has the same configuration as the constant-current control section 37.
  • the injection command signals TQ2, TQ4 are respectively inputted to the current regulation control signal generating circuit 41 and to the one-shot circuit 49, and the output signal from the OR gate 43 is applied as a drive signal to the gate of the one-shot circuit 21.
  • the circuit formed by the comparators 55, 57 and the resistors 59, 60 serves to produce the monitor signals M1, M2 described hereinabove, that are supplied to the microcomputer 130.
  • Such a circuit is also provided within the drive control circuit 120 shown in Fig. 5.
  • the voltage VCOM1 of the common terminal COM1 and the voltage VCOM2 of the common terminal COM2 are respectively applied to the inverting input terminals of the comparators 55, 57, while a voltage obtained by voltage-dividing the battery voltage VB by the resistors 59, 60 is inputted as the threshold voltage Vth to the non-inverting input terminals of the comparators 55, 57.
  • the values of the resistors 59, 60 can for example be set to have a 3:1 ratio, so that the threshold voltage Vth will be 1 ⁇ 4 of the battery voltage VB.
  • Fig. 2 is a flow diagram of the processing that is executed by the microcomputer 130, to implement the second fail-safe function. This processing is executed respectively for the No. 1 group and No. 2 group of injectors, however only the processing executed for the No. 1 group will be described.
  • the * symbol indicates the value 1
  • the symbol ** indicates the value 1 or 3.
  • the * symbol indicates the value 2
  • the symbol formed of two diagonal crossed lines and four dots indicates the value 2 or 4.
  • the counter CT1 counts the number of times that the injection command signals TQ1, TQ3 are outputted after a short-circuit to ground has occurred at the common terminal COM1. Alternatively stated, the counter CT1 serves to count the number of times that the transistor T12 is forcibly set in the off state, by the first fail-safe function that is implemented by the discharge control section 5 as described above.
  • k is the aforementioned prescribed value used with the second fail-safe function, which is the threshold value used in judging the number of times in succession that the discharge current from the capacitor C10 exceeds the overcurrent judgement threshold value Ith.
  • N is the maximum count value of the counter 19 described above referring to Fig. 1
  • (N - 1) is the number of successive judgement operations that are performed by the first fail-safe function (i.e., judgement of the capacitor discharge current) with the overcurrent judgement threshold value set at the low value IL, as described above referring to Fig. 3.
  • This predetermined interval is an interval in which the voltage VCOM1 of the common terminal COM1 becomes stable, after either of the injection command signals TQ1, TQ3 has gone to the low level.
  • step S140 If it is judged in S140 that VCOM1 > Vth, i.e., a NO decision in S140, then operation proceeds to step S150 in which a decision is made as to whether a time point has been reached at which a rising edge (low to high level transition) of either of the injection command signals TQ1, TQ3 occurs. If not, operation then returns to step S140, while if it is judged that a time point of such a rising edge has been reached, operation then returns to step S120.
  • step S140 If it is judged in S140 that VCOM1 ⁇ Vth (YES decision in S140) then this indicates that there is a short-circuit to ground at the common terminal COM1, and so the first fail-safe function is executed by the discharge control section 5, to forcibly set the transistor T12 in the on state. Operation then goes to step S160, in which the counter CT1 is incremented by one.
  • the decision step S170 serves to judge the number of successive times for which the first fail-safe function has found that the discharge current of the capacitor C10 exceeds the regular threshold value IH, i.e., to judge whether that number of times has reached the prescribed value k.
  • the processing of S180 for inhibiting outputting of the injection command signals TQ1, TQ3 is executed if the number of times is found to have reached the prescribed value k.
  • the injection command signals TQ1, TQ3 are then outputted five times in succession, subsequent outputting of these signals is inhibited. This is due to the fact that after the short-circuit to ground at the common terminal COM1 occurs, the first fail-safe function judges three times in succession that the discharge current of the capacitor C10 has exceeded the regular value IH.
  • occurrence of a short-circuit to ground at a common terminal COM1 or COM2, is used herein to refer to a short-circuit to ground that occurs at the terminal itself or that occurs in a connecting lead which is coupled to that terminal.
  • the problem of abnormal detection sensitivity (described above referring to Fig. 8) can be avoided. That is to say, with the prior art technology, if it is attempted to enable the capacitance value of the charge capacitor to be made smaller by reducing the prescribed value k to 1, then even if only a momentary short-circuit to ground occurs at either of the common terminals COM1 or COM2, drive operations for opening the injectors that belong to the group corresponding to the common terminal where the short-circuit occurs will be inhibited, and engine operation can only be continued by using only the injectors of the other group.
  • the overcurrent judgement threshold value used by the discharge control sections 5 and 7 can be switched between different values, with the low threshold value IL being made substantially identical to the target value ip of current that should flow through an injector coil when the injector is opened. Hence, even if a momentary short-circuit to ground occurs at a common terminal COM1 or COM2, there will be no adverse effect upon control of driving the injectors.
  • the threshold value Ith is restored to the regular value.
  • the low threshold value IL it is not essential that the low threshold value IL be made exactly identical to the target value ip, however preferably, it should be made close to ip.
  • the respective values of the low threshold value IL and of N can each be predetermined in accordance with design requirements, such as a required speed of recovery of the charge voltage VC of the charge capacitor after that voltage has been lowered due to the effects of a momentary short-circuit to ground at a common terminal.
  • the lower the value of IL the smaller will be the amount of charge that flows (during the short-circuit condition) at each drive operation for the injector group concerned.
  • the larger the value of N i.e., the higher the value of the judgement threshold m used in step S170 of the processing of Fig. 2
  • the greater will be the extent to which the charge capacitor voltage VC will fall, during a momentary short-circuit to ground at a common terminal.
  • the transistors T10, T20, T30, T40 correspond to respective drive switching elements and the transistors T20, T22 correspond to discharge switching elements.
  • the microcomputer 130, the discharge control signal generating circuit 9 of each of the discharge control section 5 and the discharge control circuit 7, in combination, constitute an overall control circuit for the apparatus.
  • the sections of the discharge control section 5 and discharge control circuit 7 other than the discharge control signal generating circuit 9 implement the first fail-safe function, while the processing executed by the microcomputer 130 that is shown in Fig. 2 serves to implement the second fail-safe function.
  • the above embodiment is of the common 2-system type with a single charge capacitor.
  • the invention could equally be applied to a configuration having a single common terminal and a single charge capacitor, with respective connecting leads of one or more injectors (i.e., a single group of injectors) connected only to that common terminal, or a configuration (as described in the reference document 1) in which there are two systems having respective charge capacitors provided for each of the systems.
  • the processing performed by the discharge control sections 5 and 7 of the above embodiment can be applied to such an alternative configuration, so that when a short-circuit to ground occurs at a common terminal, the level of discharge current that flows from the charge capacitor during driving of an injector to the open state can be held to a low level.
  • the short-circuit to ground is a momentary occurrence, and is resolved before driving of injectors to the open state is inhibited by the processing shown in Fig. 2 (i.e., before the count value reaches m, in an execution of step S170) it can be ensured that the voltage of the discharge capacitor will not become excessively low by the time that recovery from the short-circuit occurs.
  • normal fuel injection operation can be rapidly resumed.
  • this enables the value of each charge capacitor to be made small, so that the apparatus can be made more compact in size and lower in cost.
  • opening-object fuel injector is used in the appended claims to refer to a fuel injector that is currently to be driven to the opened state.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Fuel-Injection Apparatus (AREA)
EP20060024219 2005-11-22 2006-11-22 Kraftstoffeinspritzvorrichtung mit Sicherheitsfunktion zum Schutz vor Kurzschluss mit Masse am Verbindungskabel der Kraftstoffeinspritzspule Not-in-force EP1788228B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005337152 2005-11-22
JP2006273247A JP4650387B2 (ja) 2005-11-22 2006-10-04 燃料噴射制御装置

Publications (3)

Publication Number Publication Date
EP1788228A2 true EP1788228A2 (de) 2007-05-23
EP1788228A3 EP1788228A3 (de) 2008-08-13
EP1788228B1 EP1788228B1 (de) 2011-09-07

Family

ID=37831648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060024219 Not-in-force EP1788228B1 (de) 2005-11-22 2006-11-22 Kraftstoffeinspritzvorrichtung mit Sicherheitsfunktion zum Schutz vor Kurzschluss mit Masse am Verbindungskabel der Kraftstoffeinspritzspule

Country Status (2)

Country Link
EP (1) EP1788228B1 (de)
JP (1) JP4650387B2 (de)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045459A1 (de) * 2007-10-04 2009-04-08 Delphi Technologies, Inc. Verfahren zum Steuern einer Kraftstoffeinspritzvorrichtung
WO2016080920A1 (en) * 2014-11-17 2016-05-26 Monro Enerji Insaat Madencilik Gida Otomotiv Arastirma Gelistirme Lojistik Gaz Dolum Danismanlik Hizmetleri Sanayi Ticaret Limited Sirketi Electronic controlled device operated by a single control card for usage and control of alternative fuels in internal combustion engine
EP2323258A4 (de) * 2008-09-01 2017-06-21 Hitachi Automotive Systems, Ltd. Vorrichtung zur diagnostizierung von fehlern in einem elektromagnetischen lastkreis
CN109312680A (zh) * 2016-06-17 2019-02-05 德尔福汽车系统卢森堡有限公司 控制螺线管致动燃料喷射器的方法
DE102015200021B4 (de) 2014-01-08 2022-06-09 Denso Corporation Kraftstoffinjektor-ansteuervorrichtung
WO2022233456A1 (en) * 2021-05-05 2022-11-10 Eaton Intelligent Power Limited Power inverter and method for controlling a power inverter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7078367B2 (ja) * 2017-09-06 2022-05-31 コマツ産機株式会社 プレス装置およびプレス装置の制御方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658202A (en) * 1985-03-20 1987-04-14 Robert Bosch Gmbh Circuit arrangement for controlling the current through an electric load
DE3727498A1 (de) * 1987-08-18 1989-03-02 Hella Kg Hueck & Co Vorrichtung zum steuern der leistung eines elektrischen verbrauchers
DE10040246A1 (de) * 2000-08-14 2002-03-07 Bosch Gmbh Robert Verfahren und Vorrichtung zur Ansteuerung wenigstens eines Verbrauchers
JP2002180878A (ja) * 2000-12-12 2002-06-26 Denso Corp 電磁負荷の駆動装置

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2907001B2 (ja) * 1994-05-26 1999-06-21 三菱自動車工業株式会社 内燃エンジンの希薄燃焼制御および故障判定装置
JP3644148B2 (ja) * 1996-09-05 2005-04-27 株式会社デンソー 電磁弁駆動装置
JPH11324777A (ja) * 1998-05-15 1999-11-26 Denso Corp 過給機付内燃機関の燃料噴射装置
JP4343380B2 (ja) * 2000-02-25 2009-10-14 株式会社日立製作所 燃料噴射用ソレノイド駆動回路
JP3965930B2 (ja) * 2001-04-04 2007-08-29 株式会社デンソー 電磁負荷の制御装置
JP4465933B2 (ja) * 2001-08-23 2010-05-26 株式会社デンソー 電磁式アクチュエータ駆動装置
JP3960260B2 (ja) * 2002-07-09 2007-08-15 株式会社デンソー エンジン制御システム
JP4345375B2 (ja) * 2003-06-27 2009-10-14 日産自動車株式会社 エンジンの高回転時燃料カット制御装置
JP2005188309A (ja) * 2003-12-24 2005-07-14 Denso Corp スロットル系の異常判定装置
JP4617854B2 (ja) * 2004-12-01 2011-01-26 株式会社デンソー 電磁弁駆動装置
JP2006161792A (ja) * 2004-12-10 2006-06-22 Denso Corp 過電流検出機能を有する誘導負荷駆動回路

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658202A (en) * 1985-03-20 1987-04-14 Robert Bosch Gmbh Circuit arrangement for controlling the current through an electric load
DE3727498A1 (de) * 1987-08-18 1989-03-02 Hella Kg Hueck & Co Vorrichtung zum steuern der leistung eines elektrischen verbrauchers
DE10040246A1 (de) * 2000-08-14 2002-03-07 Bosch Gmbh Robert Verfahren und Vorrichtung zur Ansteuerung wenigstens eines Verbrauchers
JP2002180878A (ja) * 2000-12-12 2002-06-26 Denso Corp 電磁負荷の駆動装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2045459A1 (de) * 2007-10-04 2009-04-08 Delphi Technologies, Inc. Verfahren zum Steuern einer Kraftstoffeinspritzvorrichtung
US8108126B2 (en) 2007-10-04 2012-01-31 Delphi Technologies Holding S.Arl Method of controlling fuel injection apparatus
EP2323258A4 (de) * 2008-09-01 2017-06-21 Hitachi Automotive Systems, Ltd. Vorrichtung zur diagnostizierung von fehlern in einem elektromagnetischen lastkreis
DE102015200021B4 (de) 2014-01-08 2022-06-09 Denso Corporation Kraftstoffinjektor-ansteuervorrichtung
WO2016080920A1 (en) * 2014-11-17 2016-05-26 Monro Enerji Insaat Madencilik Gida Otomotiv Arastirma Gelistirme Lojistik Gaz Dolum Danismanlik Hizmetleri Sanayi Ticaret Limited Sirketi Electronic controlled device operated by a single control card for usage and control of alternative fuels in internal combustion engine
CN109312680A (zh) * 2016-06-17 2019-02-05 德尔福汽车系统卢森堡有限公司 控制螺线管致动燃料喷射器的方法
CN109312680B (zh) * 2016-06-17 2021-09-07 德尔福汽车系统卢森堡有限公司 控制燃料喷射器的工作的方法
WO2022233456A1 (en) * 2021-05-05 2022-11-10 Eaton Intelligent Power Limited Power inverter and method for controlling a power inverter

Also Published As

Publication number Publication date
EP1788228A3 (de) 2008-08-13
EP1788228B1 (de) 2011-09-07
JP2007170373A (ja) 2007-07-05
JP4650387B2 (ja) 2011-03-16

Similar Documents

Publication Publication Date Title
EP1788228B1 (de) Kraftstoffeinspritzvorrichtung mit Sicherheitsfunktion zum Schutz vor Kurzschluss mit Masse am Verbindungskabel der Kraftstoffeinspritzspule
US6832601B2 (en) Control device of fuel injection valve
US8436623B2 (en) Electromagnetic load circuit failure diagnosis device
US6384512B1 (en) Driving apparatus for piezo-actuator having abnormality detecting function
US7525783B2 (en) Monitoring method for an actuator and corresponding driver circuit
US10422310B2 (en) Ignition device
JP2003318713A (ja) 負荷駆動装置
US20130015701A1 (en) Apparatus and method for compensating power of power supply device in vehicle using high-capacitance capacitor
JPH09324735A (ja) 内燃機関用燃焼状態検知装置
US20120033341A1 (en) Semiconductor apparatus exhibiting current control function
US6212053B1 (en) Device and method for driving at least one capacitive actuator
US8149559B2 (en) Piezoelectric actuator driving device and method
US8108126B2 (en) Method of controlling fuel injection apparatus
US5218339A (en) Arrangement for monitoring a consumer in combination with an internal combustion engine and/or a motor vehicle
JP2002303185A (ja) 電磁負荷の制御装置
US5735254A (en) Circuit for detecting an overvoltage on a switched inductive load
JP2010185364A (ja) インジェクタ駆動装置
JPH11159378A (ja) 電磁弁駆動装置
US6216530B1 (en) Combustion state detecting device for an internal combustion engine
US20050235965A1 (en) Method for operating a fuel injection system for an internal combustion engine
US6853201B2 (en) Method for testing a capacitive actuator
JP4343380B2 (ja) 燃料噴射用ソレノイド駆動回路
US11808228B2 (en) Injection control device
JP3596191B2 (ja) 電磁弁駆動装置
JP5003572B2 (ja) 内燃機関の点火制御装置

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK RS

RIC1 Information provided on ipc code assigned before grant

Ipc: F02D 41/14 20060101ALI20080710BHEP

Ipc: F02D 41/22 20060101ALI20080710BHEP

Ipc: F02D 41/20 20060101AFI20070319BHEP

17P Request for examination filed

Effective date: 20080915

17Q First examination report despatched

Effective date: 20081022

AKX Designation fees paid

Designated state(s): DE FR IT

RTI1 Title (correction)

Free format text: FUEL INJECTION CONTROL APPARATUS HAVING FAIL-SAFE FUNCTION FOR PROTECTION AGAINST OCCURRENCE OF SHORT-CIRCUIT TO GROUND AT CONNECTING LEAD OF FUEL INJECTOR COIL

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602006024138

Country of ref document: DE

Effective date: 20111103

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20120611

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602006024138

Country of ref document: DE

Effective date: 20120611

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20121130

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20121116

Year of fee payment: 7

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20140731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131122

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131202

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20211118

Year of fee payment: 16

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602006024138

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230601