WO2017138330A1 - 発熱体制御装置、エンジン制御システム - Google Patents

発熱体制御装置、エンジン制御システム Download PDF

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Publication number
WO2017138330A1
WO2017138330A1 PCT/JP2017/001986 JP2017001986W WO2017138330A1 WO 2017138330 A1 WO2017138330 A1 WO 2017138330A1 JP 2017001986 W JP2017001986 W JP 2017001986W WO 2017138330 A1 WO2017138330 A1 WO 2017138330A1
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WO
WIPO (PCT)
Prior art keywords
resistance value
heating element
temperature
engine
glow plug
Prior art date
Application number
PCT/JP2017/001986
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English (en)
French (fr)
Japanese (ja)
Inventor
尚治 森田
Original Assignee
株式会社デンソー
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.)
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Publication date
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Priority to DE112017000737.2T priority Critical patent/DE112017000737T5/de
Publication of WO2017138330A1 publication Critical patent/WO2017138330A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
    • B60H1/2218—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters controlling the operation of electric heaters
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/125—Fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M31/00—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture
    • F02M31/02—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating
    • F02M31/12—Apparatus for thermally treating combustion-air, fuel, or fuel-air mixture for heating electrically
    • F02M31/13—Combustion air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
    • F02N19/00—Starting aids for combustion engines, not otherwise provided for
    • F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
    • F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
    • F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • H05B1/0227—Applications
    • H05B1/023—Industrial applications
    • H05B1/0236—Industrial applications for vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
    • B60H2001/2228—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant controlling the operation of heaters

Definitions

  • the present disclosure relates to a heating element control device that controls the temperature of a heating element provided in an engine, and an engine control system.
  • an engine is provided with a heating element that maintains each part at a predetermined temperature for reasons such as ensuring combustion performance during cold start.
  • the heating element is connected to a power source via a control device, and the temperature is controlled to be constant by the control device.
  • Patent Document 1 discloses temperature control of a glow plug which is an example of a heating element.
  • the control unit acquires the resistance value of the newly replaced glow plug at a predetermined temperature, and uses this resistance value as the target resistance. Value.
  • the control unit acquires a target power amount necessary for causing the glow plug to reach the target temperature.
  • a control part inputs the acquired target electric energy into a glow plug, and controls a glow plug to become target temperature.
  • the engine includes a plurality of heating elements for each cylinder, but the heating elements have individual differences and their resistance values vary.
  • the heating element deteriorates with aging and continues to change its resistance value. If the resistance value changes over time, even if the resistance value of the heating element is controlled to the set value, the temperature of the heating element may change and it may not be possible to ensure the combustion performance at the time of cold engine start . Therefore, as described in Patent Document 1, after replacing the heating element, the resistance value of the heating element is acquired only once and the heating element is controlled by the acquired resistance value. In some cases, the temperature control of each heating element cannot be performed properly unless the heating element is replaced and the resistance value is acquired.
  • the present disclosure has been made in view of the above problems, and provides a heating element control device or an engine control system that can automatically reduce variations in temperature of heating elements without requiring a special operation. For the purpose.
  • a heating element control device that controls the temperature of a heating element provided in an engine, the temperature control unit controlling the temperature of the heating element to a target temperature by supplying constant power to the heating element.
  • a resistance value acquisition unit that acquires a resistance value of the heating element at the target temperature as a target resistance value, and controls the resistance value of the heating element so that the resistance value of the heating element is maintained at the target resistance value
  • a resistance control unit configured to supply the constant power to the heating element before the engine is started after the engine start request is made, and the resistance control unit The unit maintains the resistance value of the heating element at the target resistance value obtained by supplying the constant power to the heating element before starting the engine.
  • the temperature control unit supplies constant power to the heating element, so that the temperature of the heating element becomes a steady state at a predetermined temperature that correlates with the amount of supplied power.
  • the resistance value of the heating element that has changed with the temperature converges to a value corresponding to each variation.
  • the temperature of the heating element converges to a temperature corresponding to the physical properties. That is, each resistance value of the heating element obtained in this state is obtained in a state where the temperatures of the heating elements are matched.
  • the resistance control unit individually controls the resistance value of the heating element so that the resistance value of the heating element is maintained at the resistance value in the steady state. Therefore, even when the resistance value of the heating element changes due to deterioration over time, the temperature of the heating element can be maintained within a predetermined range.
  • FIG. 1 is a configuration diagram showing an overall outline of an engine control system.
  • FIG. 2 is a schematic diagram showing the circuit configuration of the GCU.
  • FIG. 3 is a diagram for explaining the control for the glow plug,
  • FIG. 4 is a flowchart showing control on the glow plug,
  • FIG. 5 is an operation chart showing the change of each value in the control for the glow plug,
  • FIG. 6 is an operation chart for explaining the operation of the GCU according to the second embodiment.
  • FIG. 7 is a flowchart showing processing performed in a predetermined period after IG OFF,
  • FIG. 8 is a diagram illustrating the process performed in step S24.
  • FIG. 9 is a diagram illustrating the setting of the temperature raising time Tim_r performed in step S31.
  • FIG. 10 is an operation chart showing the timing at which the GCU according to the third embodiment performs constant power control and resistance control.
  • FIG. 1 is a configuration diagram showing an overall outline of an engine control system in the present embodiment.
  • the engine control system 100 includes an engine 10, a battery 21, a glow control unit 30 (hereinafter also referred to as GCU), and an ECU (Electronic Control Unit) 50.
  • GCU glow control unit 30
  • ECU Electronic Control Unit
  • the engine 10 is a well-known internal combustion engine that performs an internal combustion motion.
  • the engine 10 is described as a four-cylinder engine.
  • an intake valve 11 and an exhaust valve 12 are provided at an intake port and an exhaust port of an engine 10, respectively.
  • the tip of a fuel injection valve 16 protrudes, and fuel is supplied by the fuel injection valve 16. Then, the fuel self-ignites with the compression in the combustion chamber 14 and combustion is performed. Further, air is introduced into the combustion chamber 14 from the intake pipe (intake passage) 13 by the opening operation of the intake valve 11, and exhaust gas after combustion is discharged to the exhaust pipe (exhaust passage) 15 by the opening operation of the exhaust valve 12. .
  • a glow plug 17 that functions as a heating element is disposed in the combustion chamber 14 of the engine 10.
  • the glow plug 17 is, for example, a ceramic glow plug having a ceramic heater.
  • the glow plug 17 has a tip projecting from the combustion chamber 14 and heats the gas in the combustion chamber 14 by heat generation, thereby improving the ignitability of the fuel of the engine 10.
  • each cylinder is provided with four glow plugs, and when the glow plugs are distinguished from each other, reference numerals 17 # 1, 17 # 2, 17 # 3, and 17 # 4 are attached.
  • the term “temperature of the glow plug 17” means the temperature of the heater in the glow plug 17
  • the term “resistance of the glow plug 17” means the resistance of the heater.
  • the GCU 30 controls power supply to the glow plug 17.
  • the GCU 30 is connected to the glow plug 17 and the battery 21 respectively, and controls energization from the battery 21 to the glow plug 17.
  • the detailed configuration of the GCU 30 will be described later.
  • the battery 21 functions as a power source and supplies power to each part of the engine control system 100.
  • the battery 21 is, for example, a lead storage battery that supplies DC power, and supplies power to a load (not shown) in addition to the illustrated GCU 30 and ECU 50.
  • a main relay 26 is interposed between the battery 21 and the ECU 50 and GCU 30.
  • the main relay 26 also functions as a switch that opens and closes a path that connects the battery 21 to the ECU 50 and the GCU 30.
  • the main relay 26 is composed of, for example, a switch that connects paths and a solenoid that operates this switch.
  • the ECU 50 controls the driving of the engine control system 100 in an integrated manner.
  • the ECU 50 is configured mainly with a microcomputer including a CPU, a ROM, a RAM, and the like, for example. And various control of the engine 10 is implemented according to an engine driving
  • IG ignition
  • the ECU 50 calculates a command input SI based on the engine operating state for each power supply to the glow plug 17 and outputs the command input SI to the GCU 30.
  • the engine operating state include engine rotation speed, engine water temperature, outside air temperature, fuel injection amount, and the like.
  • FIG. 2 is a schematic diagram showing a circuit configuration of the GCU 30.
  • the GCU 30 is connected to the battery 21 through the battery terminal 41 and the control system power supply terminal 42, and receives power from the battery 21 through the battery terminal 41 and the control system power supply terminal 42.
  • the control system power supply terminal 42 is connected to the battery 21 via the main relay 26.
  • the GCU 30 is connected to the ECU 50 via the communication terminals 43 and 44, and communicates with the ECU 50 via the communication terminals 43 and 44.
  • the GCU 30 is connected to the glow plug 17 via the output terminal 46.
  • the GCU 30 is connected to the ground via the ground terminal 45.
  • the GCU 30 includes a switching unit 31, a voltage detection unit 32, a current detection unit 34, and a control unit 37 as its functions.
  • the GCU 30 is configured by a one-chip microcomputer, and the above-described switching unit 31, voltage detection unit 32, current detection unit 34, and control unit 37 are configured as functional blocks of this one-chip microcomputer.
  • the GCU 30 is not limited to one configured by a microcomputer, and the above-described units may be configured by hardware circuits.
  • the GCU 30 includes a switching unit 31, a voltage detection unit 32, and a current detection unit 34 for each of the glow plugs 17 # 1 to 17 # 4.
  • the switching unit 31, the voltage detection unit 32, and the current detection unit 34 corresponding to the glow plug 17 # 1 are illustrated, and the configurations corresponding to the other glow plugs 17 # 2 to 17 # 4 are illustrated. Is omitted.
  • the switching unit 31 controls the power supply of the glow plug 17 by an on / off operation.
  • the switching unit 31 includes a switch element TR made of, for example, a MOS transistor.
  • the drain of the switch element TR is connected to the battery 21 via the battery terminal 41, and the source thereof is connected to the glow plug 17 via the output terminal 46.
  • the gate of the switch element TR is connected to the output terminal of the control unit 37.
  • the voltage detector 32 detects the voltage value Vg of the glow plug 17 and outputs the detected voltage value Vg to the controller 37.
  • the detection terminal of the voltage detection unit 32 is connected to a node connecting the source of the switching unit 31 and the output terminal 46, and the output terminal is connected to the input terminal of the control unit 37.
  • the current detector 34 detects the current value Ig of the glow plug 17.
  • the current detection unit 34 has different parts so as to detect the current when the battery 21 is energized (when the switching unit 31 is on) and when the battery 21 is not energized (when the switching unit 31 is off). (The energization current detection unit 35 and the non-energization current drive unit 36).
  • the energization current detection unit 35 detects the current value of the glow plug 17 when the battery 21 is energized.
  • the energization current detection unit 35 includes a sense resistor R1 and an operational amplifier OP that calculates values at both ends of the sense resistor R1.
  • One end of the sense resistor R1 is connected to the sense terminal of the switch element TR.
  • the operational amplifier OP outputs an output corresponding to the voltage value generated in the sense resistor R ⁇ b> 1 to the control unit 37 when the battery 21 is energized.
  • control unit 37 Since this output changes depending on the current value of the glow plug 17, the control unit 37 obtains applied power based on the output from the energization current detection unit 35 and the output from the voltage detection unit 32, and By obtaining the resistance value of the heating element of the plug, the current value of the glow plug 17 can be controlled.
  • the non-energized current drive unit 36 includes a resistor R2. One end of the resistor R2 is connected to a constant current source, and the other end of the resistor R2 is connected to a node connecting the source of the switch element TR and the output terminal 46. Has been.
  • the control unit 37 causes the current from the constant current source to flow to the glow plug 17 from the non-energized current driving unit 36 when the switch element TR is off. Since the value of the current from the constant current source is constant, the control unit 37 determines the voltage value during non-energization generated in the glow plug 17 detected by the voltage detection unit 32, the drive current from the constant current source, Thus, the resistance value of the heating element can be detected.
  • the resistance R2 of the non-energized current drive unit 36 be a low value, similarly to the resistance value Rg of the glow plug 17.
  • connecting the non-energized current drive unit 36 to a constant current source is merely an example.
  • the non-energized current driving unit 36 is connected only to the constant voltage source, and controls the current value according to the voltage dividing ratio between the resistance R2 and the resistance value Rg of the glow plug 17 via an operational amplifier or the like. It may be output to the unit 37.
  • the non-energizing current drive unit 36 is always energized, and the control unit 37 adds a constant current component to the current value obtained by the energizing current detection unit 35 as the energizing current when the switch element TR is turned on. May be controlled.
  • the control unit 37 can suppress an error due to a timing difference between the current output and the voltage detection in detecting the resistance value of the heating element when the glow plug 17 is energized and de-energized.
  • the control unit 37 and the non-energized current drive unit 36 may not be electrically connected.
  • control unit 37 detects the resistance value Rg of the glow plug 17 by dividing the voltage acquired by the voltage detection unit 32 by the current acquired by the current detection unit 34 and the non-energized current drive unit 36. In this embodiment, the controller 37 detects the resistance value Rg using the current Ig detected by the energization current detector 35 when the battery 21 is energized. In addition, the control unit 37 detects the resistance value Rg using the current Ig (current value during non-energization) detected according to the driving of the non-energized current drive unit 36 when the battery 21 is not energized. Therefore, in this embodiment, the control unit 37 also functions as a resistance detection unit.
  • the control unit 37 controls the driving of the switching unit 31.
  • the control unit 37 is mainly configured by a microcomputer (hereinafter referred to as a microcomputer) composed of, for example, a well-known CPU, ROM, RAM, and the like.
  • the control unit 37 receives a command input SI from the ECU 50 via the communication terminal 43 and outputs a gate signal for operating each switching unit 31.
  • the glow plugs 17 # 1 to 17 # 4 are energized by this gate signal so that the energization timing arrives every predetermined period (for example, 30 msec).
  • the control unit 37 outputs a diagnosis result to the ECU 50 via the communication terminal 44 when an abnormality is detected during abnormality diagnosis of the glow plug 17.
  • FIGS. 3A and 3B temperature control of the glow plug 17 will be described with reference to FIGS. 3A and 3B.
  • the temperature change for the four glow plugs 17 # 1 to 17 # 4 in which the resistance value varies is shown in FIG. 3A, and the resistance value change is shown in FIG. 3B.
  • the GCU 30 controls the temperature of the glow plug 17 at a constant temperature (resistance value control) every time the IG switch 25 is turned on (hereinafter also referred to as IG on).
  • the constant power control is performed after the rapid temperature raising operation for driving at the maximum power every time the IG is turned on in order to keep the temperature of the glow plug 17 at the target temperature in the steady state.
  • This constant power control is performed in a period in which there is little disturbance affecting the glow plug temperature, such as until the start (cranking) of the engine 10 by a starter (not shown) is started.
  • Rapid heating is performed by rapidly applying a battery voltage to the glow plug 17 for a certain time so that the temperature of the glow plug 17 increases.
  • the rapid temperature increase is performed by open control in which a voltage is applied at a PWM duty drive duty of 100% and the time for temperature increase is set to a predetermined value.
  • the constant power control is repeatedly turned on and off so that the energization is turned on at a predetermined constant cycle, and the energization is turned off when the integrated power calculated from the voltage and current reaches a set value. Control. Further, the resistance value when the set integrated power value is reached is obtained.
  • the glow plug is set so that the supplied power becomes a constant value. The energization to 17 is controlled. As shown in FIG.
  • the constant power control is continued until the temperature of the glow plug 17 reaches a steady state where the temperature is within a predetermined range.
  • the temperatures of the glow plugs 17 # 1 to 17 # 4 in the steady state are determined by the specific heat or material of the glow plug 17 because the heat dissipation characteristics of the glow plug 17 are substantially the same.
  • the glow plugs 17 # 1 to # 4 Temperature converges to the same temperature.
  • the resistance values Rg1 to Rg4 of the glow plug 17 when converged to the steady state vary depending on individual variations, changes with time, and the like.
  • each resistance value obtained by constant power control is a resistance targeted for control.
  • the resistance value of the glow plug 17 is controlled to be maintained at the resistance value in the steady state during the constant power control.
  • the switching unit 31 is turned on / off while detecting the resistance value so that the detected resistance values Rg1, 2, 3, 4 of the glow plug 17 are maintained at these control target values. Control is implemented.
  • the resistance values Rg1 to Rg4 are maintained in a certain range for the glow plugs 17 # 1 to 17 # 4, respectively, and the temperature of the glow plug 17 is maintained at a temperature converged by constant power control.
  • FIGS. 3A and 3B control for the glow plug 17 shown in FIGS. 3A and 3B will be described with reference to the flowchart shown in FIG.
  • the processes shown in and after S12 in FIG. 4 are processes performed by the GCU 30 each time the IG switch 25 is turned on.
  • the GCU 30 functions as a temperature control unit by performing the processes of steps S12 to S15, and functions as a resistance value acquiring unit by performing the process of step S16, and performs the process of S17.
  • FIGS. 5A to 5C are operation charts showing changes in values in the control of the glow plug 17.
  • step S11 it is determined whether IG is on. For example, when the IG switch 25 is operated and the main relay 26 is turned on so that the power from the battery 21 is supplied to the GCU 30, the GCU 30 determines that the IG is on. The GCU 30 determines that a start request for the engine 10 has been generated based on the determination that the IG is on. In step S ⁇ b> 11, the ECU 50 may determine that a start request has been generated when the IG is turned on, and the GCU 30 may determine that a start request has been generated for the engine 10 by transmitting an energization command to the GCU 30.
  • step S12 rapid temperature increase is performed.
  • the GCU 30 controls the switching unit 31 so that the duty becomes 100%, and the temperature of the glow plug 17 is increased by the application of the battery voltage at this time. Due to this rapid temperature rise, the temperature of the glow plug 17 rises rapidly.
  • step S13 the elapse of the temperature raising time Tim_r is determined.
  • the temperature increase time Tim_r in step S13 is a time that is predetermined as a time required for the glow plug 17 to reach a predetermined temperature when a battery voltage of 100% is applied, for example. That is, the temperature of the glow plug 17 quickly reaches a predetermined temperature range by performing rapid temperature increase for the temperature increase time Tim_r.
  • step S14 When it is determined that the temperature increase time Tim_r has elapsed (step S13: YES), constant power control is performed in step S14. As shown in FIG. 5A, during the period in which the constant power control is performed, the GCU 30 integrates the power during the on period obtained by multiplying the voltage value Vg and the current value Ig detected in the predetermined period. The energization to the glow plug 17 is repeatedly controlled such that the energization is turned off at a predetermined integrated value and the energization is turned on at a constant cycle, so that the integrated power per cycle becomes constant at the predetermined integrated value.
  • the glow plug 17 is warmed according to the input electric power, and changes its resistance value Rg as shown in FIG.
  • step S15 a change in the resistance value Rg of the glow plug 17 is monitored.
  • the GCU 30 monitors the resistance value Rg.
  • the GCU 30 monitors the respective resistance values Rg # 1 to # 4 of the glow plugs 17 # 1 to 17 # 4.
  • the period during which the resistance value Rg is continuously monitored in step S15 is determined based on whether or not the resistance value Rg at a predetermined timing of the glow plug 17 converges within a certain range (steady state). For example, the GCU 30 stores the resistance value Rg immediately before turning off the power, and determines that the resistance value Rg has converged to a certain range if the difference between the previous and current resistance values Rg is equal to or less than a threshold value. In FIG. 5B, the resistance value Rg has converged within a certain range on the right side in the figure, and the GCU 30 performs convergence determination.
  • Convergence determination is performed when the difference between the previous and current resistance values at the start of energization is less than a predetermined value, or the difference between the previous and current constant power control on-time is less than a predetermined value. In this case, it may also be determined that the convergence has occurred when the difference between the previous and current glow plug temperatures separately measured at a predetermined period is equal to or less than a predetermined value. In addition to this, the convergence determination may be performed when the resistance value Rg is continuously within a predetermined number of times.
  • the resistance value Rg at this time is acquired as the target resistance value Tg.
  • This target resistance value Tg is a target value in resistance value control.
  • target resistance values Tg # 1 to Tg # 4 are acquired for each of the glow plugs 17 # 1 to 17 # 4 every time the IG is turned on.
  • the target resistance value Tg may be obtained by averaging a plurality of values immediately before the convergence point of the resistance value Rg.
  • the acquisition timings of the target resistance values Tg # 1 to Tg # 4 corresponding to the glow plugs 17 # 1 to 17 # 4 in step S16 are the resistance values Rg of all the glow plugs 17 # 1 to 17 # 4 in step S15. Is implemented on the condition that has converged.
  • the target resistance values Tg # 1 to Tg # 4 are acquired in step S16. It may be.
  • step S17 resistance value control is performed.
  • the GCU 30 controls the glow plug 17 so that the resistance value Rg of each of the glow plugs 17 # 1 to 17 # 4 approaches the corresponding target resistance value Tg (# 1 to # 4) acquired in step S16.
  • Energization is controlled (FIG. 5A). For example, when the resistance value Rg becomes larger than the target resistance value Tg, the GCU 30 turns off the battery voltage. On the other hand, when the resistance value Rg becomes smaller than the target resistance value Tg by a predetermined value or more, the GCU 30 turns on the battery voltage.
  • FIG. 5C the description of the power change in the resistance value control is omitted for convenience.
  • Resistance value control is terminated when the engine 10 is turned off (also referred to as IG off) by operating the IG switch 25, and the processing shown in FIG. 4 is terminated.
  • the GCU 30 performs constant power control on the glow plug 17 so that the temperature of each glow plug 17 becomes a predetermined value. Reach the steady state.
  • the resistance value of the glow plug 17 converges to a value corresponding to individual variations.
  • the power supplied to each glow plug 17 is constant, the temperature of each glow plug 17 converges to a temperature corresponding to the physical properties. That is, each resistance value of the glow plug acquired in this state is obtained in a state where the temperatures of the glow plugs 17 are matched.
  • the GCU 30 individually controls the resistance value of each glow plug 17 so that the resistance value of the glow plug 17 is maintained at a resistance value (target resistance value) in a steady state. Therefore, even when the resistance value varies among the glow plugs 17 due to deterioration over time, the temperature of each glow plug 17 can be maintained within a predetermined range.
  • the resistance value of the glow plug 17 gradually changes over a long time due to deterioration over time. Therefore, it is possible to acquire the resistance value Rg for maintaining the temperature of the glow plug 17 in a predetermined range by performing constant power control each time the energization is started when IG is turned on. For example, when the resistance value Rg increases due to aged deterioration, the same amount of power is input as a result by increasing the effective voltage applied by constant power control even if the applied current decreases. The resistance value Rg at the same temperature as that of the glow plug 17 before the increase in the resistance value Rg due to aging can be obtained. And it becomes possible to maintain the temperature of the glow plug 17 in the same predetermined range as before deterioration by resistance value control using the acquired resistance value Rg.
  • constant power is always applied to the glow plug 17 by the GCU 30 performing constant power control for a predetermined time in a state where there is little influence on the temperature raising operation such as before the engine start request. Therefore, even for the glow plug 17 whose resistance value has changed due to aging, the temperature always converges to a predetermined temperature corresponding to the physical properties. Then, by performing resistance value control for maintaining the resistance value Rg at this time, even when the engine 10 is started and the temperature change of the glow plug 17 due to the fluctuation of the battery voltage or the in-cylinder airflow occurs, the constant power is maintained. Resistance value control corresponding to a predetermined temperature obtained by performing the control and targeting a resistance value including a secular change is performed.
  • energization control is performed so that the resistance value of the glow plug 17 is matched even if the temperature of the glow plug 17 changes due to fluctuations in the power supply voltage or cooling due to in-cylinder airflow. As a result, the temperature of the glow plug 17 can be controlled to be constant.
  • the start request of the engine 10 means a case where the main relay 26 is turned on by the driver operating the IG switch 25.
  • the engine 10 after the so-called idling stop is performed.
  • the disturbance due to the start of the engine 10 is, for example, a glow plug 17 caused by a rapid voltage drop of the battery 21 caused by the start of rotation of the crankshaft of the engine 10 by a starter or a flow of airflow generated in the cylinder. This means a decrease in temperature due to cooling.
  • the GCU 30 continuously energizes the glow plugs 17 # 1 to 17 # 4 for a predetermined time before the constant power control of the glow plugs 17 # 1 to 17 # 4 (rapid temperature rise).
  • the GCU 30 performs resistance value control on the glow plugs 17 # 1 to 17 # 4 when the change amount of the resistance value of the glow plugs 17 # 1 to 17 # 4 is within a predetermined range.
  • the GCU 30 newly acquires the target resistance value Tg or has already acquired the target resistance value according to the time from when the engine 10 is stopped until the engine 10 is started again. Switch whether to use Tg.
  • FIG. 6 is an operation chart for explaining the operation of the GCU 30 according to the second embodiment.
  • each temperature control rapid temperature rise, constant power control, resistance value control
  • the period TA and the period TB have a relationship of TA> TB.
  • the GCU 30 starts rapid temperature increase. Thereafter, it is assumed that the driver operates the IG switch at time t2 and IG OFF is established before the GCU 30 starts constant power control. Thereafter, when the IG is turned on at time t3 after the period TA has elapsed, the GCU 30 resumes rapid temperature increase and starts constant power control at time t4. Thereafter, when the glow plug 17 reaches a steady state at time t5, the target resistance value Tg is obtained from the obtained resistance value Rg, and the GCU 30 starts resistance value control so as to coincide with the target resistance value Tg.
  • IG OFF is established at time t6.
  • the GCU 30 performs the rapid temperature increase, but without performing the constant power control. Start resistance value control. That is, in this state, the GCU 30 performs resistance value control using the target resistance value Tg stored at the previous time (time t5).
  • FIG. 7 is a flowchart illustrating a process performed in a predetermined period after the engine 10 is stopped (after the IG is turned off) in the flowchart illustrating the process illustrated in FIG. 6.
  • the flowchart shown in FIG. 7 is processing performed by the GCU 30 after IG OFF is established.
  • step S21 an elapsed time after IG OFF is established is acquired.
  • the elapsed time is acquired in order to determine the period after the IG is turned off, and is updated each time the process shown in FIG. 7 is repeated.
  • the GCU 30 acquires the elapsed time based on an output from a timer (not shown).
  • step S22 it is determined whether IG is on. After the IG is turned off, the GCU 30 determines whether or not the IG-on command input SI is transmitted again from the ECU 50.
  • step S22 If it is not determined that IG is on (step S22: NO), the process proceeds to step S23. On the other hand, if it is determined that IG is on (step S22: YES), in step S24, the temperature control of the glow plug 17 is performed, and the process ends. By the temperature control executed in step S24, the resistance value control using the previously stored target resistance value Tg is performed.
  • step S23 it is determined whether or not the time until the main relay 26 is turned off has elapsed.
  • the GCU 30 makes the determination in step S23 based on whether or not the elapsed time updated in step S21 has passed the time that the main relay 26 is turned off. If the time has not elapsed (step S23: NO), since the main relay 26 is kept on, the GCU 30 returns to step S21 and updates the elapsed time. On the other hand, if the time has passed (step S23: YES), the main relay 26 is then turned off, and the process is terminated.
  • the GCU 30 When the IG is turned on again after the main relay 26 is turned off, the GCU 30 performs the process shown in FIG. 4 as in the first embodiment. Therefore, the GCU 30 acquires the target resistance value Tg in the glow plug 17 by performing constant power control (FIG. 4, step S14), and performs resistance value control (FIG. 4, step S17). On the other hand, when performing the process of step S24, the process shown in FIG. 8 is implemented.
  • a temperature increase time Tim_r which is a period for performing rapid temperature increase.
  • the GCU 30 changes the temperature increase time Tim_r according to the length of the period from when IG is turned off until IG is turned on. Specifically, the temperature increase time Tim_r is acquired according to the count value updated in step S21 of FIG.
  • FIG. 9 is a diagram illustrating the setting of the temperature raising time Tim_r performed in step S31.
  • the GCU 30 sets the value so that the temperature increase time Tim_r becomes shorter as the elapsed time acquired in step S21 of FIG. 7 is shorter.
  • the amount of decrease in the temperature of the glow plug 17 is smaller, and if the temperature of the glow plug 17 is increased, the temperature of the glow plug 17 may become excessive.
  • the glow plug 17 is formed of a material having a low resistance value for the purpose of increasing the rate of temperature rise, the glow plug 17 may be deteriorated if the temperature of the glow plug 17 is excessively increased. Therefore, in this 2nd Embodiment, the implementation time of rapid temperature rising is varied according to the period after IG-off is established until IG-on is established again.
  • step S32 rapid temperature increase is performed. Therefore, the GCU 30 performs the rapid temperature increase for the glow plug 17 for the temperature increase time Tim_r set in step S31.
  • step S33 it is determined whether the temperature increase time Tim_r set in step S32 has elapsed.
  • step S33 When the temperature raising time Tim_r has elapsed (step S33: YES), the stored target resistance value Tg is read in step S34. Also in this embodiment, the GCU 30 reads the target resistance value Tg of each of the glow plugs 17 # 1 to 17 # 4.
  • step S35 resistance value control is performed.
  • the GCU 30 connects the glow plugs 17 # 1 to 17 # 4 so that the resistance values Rg of the glow plugs 17 # 1 to 17 # 4 approach the target resistance value Tg read in step S34 (that is, the previously acquired target resistance value). 17 energization is controlled.
  • the GCU 30 maintains the main relay 26 for supplying power after the IG switch 25 (power switch) is turned off for a predetermined time in the engine control system 100 (control). System). Then, GCU 30 controls the resistance values of glow plugs 17 # 1 to 17 # 4 using the target resistance value that is already stored when the time from the stop to restart of engine 10 is within a predetermined time. To do. With the above configuration, when the time from when the engine 10 is stopped to when the engine is restarted is short, resistance value control is performed using the target resistance value that has already been stored. Can be shortened.
  • the GCU 30 shortens the period for performing rapid temperature increase after restarting as the period from when the engine 10 is stopped to when it is restarted becomes shorter.
  • FIG. 10 is an operation chart showing the timing at which the GCU 30 according to the third embodiment performs constant power control and resistance control.
  • the GCU 30 performs the constant power control performed to acquire the target resistance value Tg during idling after the engine 10 is started (after cranking is completed) or during a certain period when the IG is off.
  • resistance value control for controlling the temperature of the glow plug 17 is performed when the IG is on
  • resistance control is performed using the previously acquired target resistance value Tg as shown in the second embodiment when the IG is on. Will be carried out.
  • the GCU 30 includes not only the voltage detection unit 32 and the current detection unit 34 corresponding to the number of glow plugs 17 that can be connected, but also includes only one set of the above-described units. It is good also as a structure which implements control. In this case, the constant power control in step S14 and the resistance value control in step S17 in FIG. 4 are performed for each glow plug 17 # 1 to 17 # 4 while shifting the time series.
  • the glow plug 17 is a ceramic glow plug, it may be a glow plug that generates heat when energized and changes its own resistance value according to its own temperature change, and may be a metal glow plug.
  • the engine 10 includes four glow plugs 17, and the number of glow plugs 17 corresponding to the number of cylinders may be provided.
  • glow plug 17 as the heating element is merely an example, and any type may be used as long as it is provided in the engine 10 and temperature control is performed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Resistance Heating (AREA)
PCT/JP2017/001986 2016-02-10 2017-01-20 発熱体制御装置、エンジン制御システム WO2017138330A1 (ja)

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JP2016024087A JP6631294B2 (ja) 2016-02-10 2016-02-10 発熱体制御装置、エンジン制御システム
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Cited By (1)

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CN112471601A (zh) * 2020-11-27 2021-03-12 上海烟草集团有限责任公司 多段温控方法、多段加热设备及计算机可读存储介质

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JP7010139B2 (ja) 2018-05-21 2022-01-26 株式会社豊田自動織機 グロープラグ制御装置

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Publication number Priority date Publication date Assignee Title
JP2004108189A (ja) * 2002-09-17 2004-04-08 Ngk Spark Plug Co Ltd グロープラグ通電制御装置
JP2009250182A (ja) * 2008-04-09 2009-10-29 Denso Corp 発熱体制御装置
JP2010127487A (ja) * 2008-11-25 2010-06-10 Ngk Spark Plug Co Ltd ヒータの通電制御装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004108189A (ja) * 2002-09-17 2004-04-08 Ngk Spark Plug Co Ltd グロープラグ通電制御装置
JP2009250182A (ja) * 2008-04-09 2009-10-29 Denso Corp 発熱体制御装置
JP2010127487A (ja) * 2008-11-25 2010-06-10 Ngk Spark Plug Co Ltd ヒータの通電制御装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112471601A (zh) * 2020-11-27 2021-03-12 上海烟草集团有限责任公司 多段温控方法、多段加热设备及计算机可读存储介质

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