JP5594825B2 - Accumulated fuel injection device and control device therefor - Google Patents

Description

  The present invention relates to an accumulator fuel injection device for injecting fuel into a cylinder of an internal combustion engine and a control device therefor. In particular, the present invention relates to an accumulator fuel injection apparatus configured to be able to correct a deviation in fuel injection amount due to individual differences of injectors caused by manufacturing tolerances, deterioration, and the like, and a control apparatus thereof.

  2. Description of the Related Art Conventionally, as a device for injecting fuel into a cylinder of an engine mounted on a vehicle, a pressure accumulation type fuel injection device having a common rail for temporarily storing fuel pressurized by a high pressure pump is used. A plurality of injectors are connected to the common rail, and fuel is injected into the cylinders of the engine at a desired injection timing by performing energization control of each injector while high-pressure fuel is supplied to each injector. The

In recent years, diesel engines, for the purpose of reducing the combustion noise and NO _X to improve the combustion of the fuel in the cylinder, it is general to carry out the pilot injection of small quantity before the main injection It has become. In carrying out this pilot injection, in order to sufficiently obtain the effect of reducing the combustion noise and NO _X, it is required to accurately control the injection amount of the small injection. However, in the injector, there may be a deviation between the instructed injection amount and the actual injection amount due to variations in injection characteristics among the injectors caused by manufacturing tolerances and deterioration with time.

  As a control device that can learn the deviation of the injection amount and improve the accuracy of the fuel injection control, there is no cost increase due to additional equipment, and the fuel injection control of the diesel engine that can carry out the injection amount learning with high accuracy A device has been proposed. Specifically, the single injection is performed at the time of no injection when the command injection amount to the injector is zero or less, and the change amount of the engine speed that is increased by the single injection and the engine speed when the single injection is performed. There has been disclosed a fuel injection control device configured to calculate a product as a torque proportional amount and to estimate an actual injection amount from a generated torque calculated from the torque proportional amount (see, for example, Patent Document 1).

JP 2005-36788 A (the whole sentence, all figures)

  However, when the combustion environments in the cylinders of the internal combustion engine are different, the same combustion state may not be obtained even when the same amount of fuel is injected. For example, as shown in FIG. 6, since the amount of oxygen in the atmosphere differs between when the internal combustion engine is placed on a flat ground and when it is placed on a high ground, the injection amount Q is the same. The combustion state is different, and the difference is likely to occur in the generated torque (engine speed change amount = angular speed fluctuation amount). In addition, it is conceivable that a difference in combustion temperature occurs due to a difference in cooling water temperature or outside air temperature of the internal combustion engine, or a difference in combustion occurs due to a difference in explosive force caused by a different boost pressure.

  Therefore, if the injection amount learning control described in Patent Document 1 is executed without considering the difference in the combustion state, the relationship between the generated torque stored in advance and the injection amount is obtained. If the actual relationship between the single injection and the actual injection amount is different, an error occurs between the estimated actual injection amount and the actual injection amount. There is a possibility that the deviation from the amount cannot be resolved.

  Therefore, the inventors of the present invention have made diligent efforts to learn the injection time when the fluctuation amount of the crank angular speed when the minute injection is executed in the non-injection state of the internal combustion engine becomes the reference fluctuation amount, and to control the drive of the injector. In calculating the correction coefficient when performing this, it is possible to solve such problems by detecting the current combustion environment information and varying the reference fluctuation amount used for learning control according to the value of the detected combustion environment information And the present invention has been completed. That is, according to the present invention, even when the combustion state in the cylinder is different, the pressure accumulation in which the injection time during which the fuel of the reference injection amount is injected is accurately determined and the drive control of the injector can be accurately performed An object of the present invention is to provide a fuel injection device and a control device therefor.

According to the present invention, in a control apparatus for an accumulator fuel injection apparatus that controls an accumulator fuel injection apparatus having a common rail connected to a plurality of injectors to perform fuel injection control into a cylinder of an internal combustion engine. Injector control means for determining the injection time based on the injection amount and controlling the injector drive, combustion environment detection means for detecting combustion environment information in the cylinder of the internal combustion engine, and detecting no fuel injection state to the internal combustion engine No-injection state detection means, pressure control means for controlling the pressure in the common rail to a predetermined pressure when a fuel no-injection state is detected, and an injector after the fuel no-injection state is detected and the pressure becomes the predetermined pressure The amount of fluctuation in the crank angular speed of the internal combustion engine when the micro injection is executed a plurality of times while the injection time is changed by the control means is executed in advance. Learning control means for executing control for learning the injection time when the reference fluctuation amount obtained by the fixed reference injection amount is reached, the reference injection time assumed to obtain the reference injection amount, and the learned injection time Correction coefficient calculation means for calculating a correction coefficient when performing drive control of the injector by using the reference fluctuation amount used for learning control as the value of the combustion environment information detected by the combustion environment detection means. The reference variation amount is made up of a plurality of reference variation amounts set in accordance with the value of the combustion environment information, and the learning control means is configured for each of the combustion environment information corresponding to the plurality of reference variation amounts. values and the value of the combustion environment information detected by the combustion environment detection unit, an accumulator fuel to a plurality of values of the reference change amount, and obtains the reference change amount used in learning control based on Is morphism device provided, it is possible to solve the problems described above.

  Further, in configuring the control apparatus for the pressure accumulation type fuel injection device of the present invention, the combustion environment detection means includes the ambient atmospheric pressure, the cooling water temperature of the internal combustion engine, the ambient outside temperature, the boost pressure of the internal combustion engine as the combustion environment information. It is preferable to detect any of the above.

  Further, in configuring the control device for the accumulator fuel injection device of the present invention, the correction coefficient may be a correction coefficient for auxiliary injection executed before main injection in one cycle of the cylinder of the internal combustion engine. preferable.

  Another aspect of the present invention is a pressure accumulation type fuel injection device including any one of the control devices described above.

  According to the accumulator fuel injection device and the control device of the present invention, the correction coefficient when performing the drive control of the injector by learning the injection time of the minute injection when the fluctuation amount of the crank angular velocity becomes the reference fluctuation amount is calculated. In doing so, by using the reference fluctuation amount according to the current value of the combustion environment information, it is possible to accurately obtain the injection time for obtaining the reference injection amount. Therefore, the drive control of the injector can be accurately executed using the correction coefficient obtained based on the obtained injection time and the reference injection time.

It is a figure for demonstrating the structural example of a pressure accumulation type fuel-injection apparatus. It is a block diagram for demonstrating the example of a structure of the control apparatus of the pressure accumulation type fuel injection apparatus of this embodiment. It is a figure for demonstrating learning control. It is a flowchart figure which shows the whole flow of control of the pressure accumulation type fuel injection apparatus of this embodiment. It is a flowchart figure which shows the specific example of control of the pressure accumulation type fuel injection apparatus of this embodiment. It is a figure for demonstrating the difference in combustibility by the difference in atmospheric pressure.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments relating to a pressure accumulation fuel injection device and a control device thereof according to the present invention will be specifically described below with reference to the drawings. However, the following embodiment shows one aspect of the present invention and does not limit the present invention, and can be arbitrarily changed within the scope of the present invention. In addition, what attached | subjected the same code | symbol in each figure has shown the same member, and description is abbreviate | omitted suitably.

1. FIG. 1 shows a configuration example of an accumulator fuel injection apparatus 50 according to an embodiment of the present invention. The accumulator fuel injection device 50 is a device for injecting fuel into the cylinder 41 of the internal combustion engine 40, and includes a fuel tank 1, a low pressure feed pump 2, a flow control valve 8, a high pressure pump 5, and a common rail 10. And a pressure control valve 12, an injector 13, a control device 60 and the like as main elements.

  In the internal combustion engine 40, as the crankshaft 43 rotates, the piston 42 reciprocates the cylinder 41. When the cylinder 41 is in a compressed state, fuel is injected into the cylinder 41 and an explosion occurs in the cylinder 41. The piston 42 is pushed down. Then, the crankshaft 43 is driven by being further rotated. The internal combustion engine 40 is provided with a crank angle sensor 44 for detecting a crank angle that is a rotational phase of the crankshaft 43.

  The low pressure feed pump 2 sucks up the fuel in the fuel tank 1 and supplies it to the high pressure pump 5. As the low-pressure feed pump 2, a gear pump driven by the power of the engine 40, an electromagnetic pump driven by a current supplied from a battery, or the like is used.

  The high pressure pump 5 pressurizes the fuel supplied by the low pressure feed pump 2 and pumps it to the common rail 10. The high-pressure pump 5 is provided with a plunger 7 that is moved up and down by the driving force of the engine 40. Fuel flows into the pressurizing chamber 5a whose volume is changed by the vertical movement of the plunger 7 through the fuel intake valve 15, and the pressurized fuel is pumped to the common rail 10 through the fuel discharge valve 16. It is like that.

  The low pressure feed pump 2 and the high pressure pump 5 are connected by a low pressure supply passage 18. A flow rate control valve 8 for proportionally controlling the flow rate of the fuel supplied to the pressurizing chamber 5 a of the high pressure pump 5 is provided in the middle of the low pressure supply passage 18. A first return passage 30 a is connected to the low pressure supply passage 18 upstream of the flow rate control valve 8, and the other end side of the first return passage 30 a communicates with the fuel tank 1. An overflow valve 14 is provided in the first return passage 30a. The fuel supplied excessively by the low-pressure feed pump 2 is returned to the fuel tank 1 through the first return passage 30a.

  The common rail 10 connected to the high-pressure pump 5 via the high-pressure supply passage 37 accumulates high-pressure fuel pumped by the high-pressure pump 5 and supplies the fuel to the plurality of injectors 13 at an equal pressure. Each injector 13 connected to the common rail 10 is controlled to be opened and closed by energization control, and injects fuel pumped from the common rail 10 into the cylinder 41 of the engine 40. The injector 13 is connected to a third return passage 30 c for returning leaked fuel discharged along with the control of opening and closing of the injector 13 to the fuel tank 1. The other end of the third return passage 30 c communicates with the fuel tank 1.

  The common rail 10 is provided with a rail pressure sensor 21. The sensor value of the rail pressure sensor 21 is used for rail pressure control. The common rail 10 is connected to a second return passage 30b provided with a pressure control valve 12 for proportionally controlling the flow rate of fuel discharged from the common rail 10. The other end of the second return passage 30 b communicates with the fuel tank 1.

2. 2. Control Device FIG. 2 is a functional block diagram showing a part related to learning control in the configuration of the control device 60 provided in the accumulator fuel injection device 50 of this embodiment.
The control device 60 is configured around a microcomputer having a known configuration, and includes an injector control means 61, a non-injection state detection means 62, a pressure control means 63, an angular velocity detection means 64, and a combustion environment detection. Means 65, learning control means 66, correction coefficient calculation means 67 and the like are provided as main components. Each of these means is specifically realized by execution of a program by a microcomputer. In addition, the control device 60 includes storage means such as a RAM (Random Access Memory) (not shown), and stores various pieces of read information and calculation results.

  Among these, the injector control means 61 obtains the target fuel injection amount Qtgt based on the engine speed Ne, the accelerator operation amount Acc, and the like, and sets the actual rail pressure Pact and the target fuel injection amount Qtgt detected by the rail pressure sensor 21. Based on this, the energization time of the injector 13 is obtained, and an energization instruction is output to the actuator of the injector 13.

Further, upon receiving an instruction for execution of learning control from the learning control means 66, the injector control means 61 executes one minute injection in one cycle a plurality of times while changing the injection time from the injector 13 that performs learning control. It comes to perform control. This minute injection is performed with a minute amount that does not significantly affect the output of the internal combustion engine 40, for example, about 1 to ³ mm ³ . Further, the non-injection state detection means 62 detects a non-injection state when the target fuel injection amount Qtgt determined by the injector control means 61 becomes zero.

  The pressure control means 63 obtains a target value (hereinafter referred to as “target rail pressure”) Ptgt of the rail pressure based on the engine speed Ne, the accelerator operation amount Acc, and the like, and also calculates the target rail pressure Ptgt and the actual rail pressure Pact. Based on the difference, the energization amount to at least one of the flow control valve 8 or the pressure control valve 12 is feedback-controlled. Further, when the non-injection state is detected by the non-injection state detection unit 62, the pressure control unit 63 sets the target rail pressure Ptgt to the learning control execution target pressure Ptgt_cal and controls the rail pressure. The target pressure Ptgt_cal at the time of learning control execution may be a constant value or may be selected from a plurality of values. In the present embodiment, auxiliary injection is executed before execution of main injection. It is set according to the rail pressure that can be performed.

  The angular velocity detection means 64 continuously reads the sensor signal Sω of the crank angle sensor 44 every unit time, and detects the angular velocity Ω based on the rotational displacement of the crankshaft 43 per unit time.

  The combustion environment detection means 65 detects combustion environment information that affects the fuel combustion conditions in the cylinder 41 of the internal combustion engine 40. The combustion environment detection means 65 only needs to be able to detect the state of an element that affects the torque generated by the internal combustion engine 40. As an example, the combustion environment detection means 65 is configured to detect the ambient atmospheric pressure Pair, the cooling water temperature Tcool of the internal combustion engine 40, the ambient outside temperature Tair, the boost pressure Pboost of the internal combustion engine 40, etc. In the embodiment, the combustion environment detection means 65 detects the surrounding atmospheric pressure Pair based on sensor information of the atmospheric pressure sensor and the like. The atmospheric pressure Pair differs depending on the altitude at which the vehicle is currently placed, that is, information that reflects the amount of oxygen in the atmosphere.

  The learning control means 66 executes control for learning the injection time Etzfc_act in which the fuel of the reference minute injection amount Qzfc0 is injected by the injector 13 that is actually used. Specifically, the learning control means 66 refers to the injection time ETZfc_act in which the fuel of the reference minute injection amount Qzfc0 is injected by the injector 13 as the amount of change in angular velocity of the internal combustion engine 40 (hereinafter referred to as “angular velocity change amount”). .) Based on ΔΩzfc.

Here, the basic concept of the learning control executed by the learning control means 66 will be specifically described with reference to FIG.
When the non-injection state is detected and the actual rail pressure Pact is controlled to the target pressure Ptgt_cal at the time of learning control execution, the learning control unit 66 performs one minute injection from the injector 13 that performs learning control in one cycle. A learning control execution instruction is sent to the fuel injection valve control means 61 so as to be executed a plurality of times while changing the injection time ET. When the minute injection is executed, the angular velocity Ω of the internal combustion engine 40 increases from the compression stroke in the cylinder 41 into which the fuel is injected to the expansion process.

  Further, the learning control means 66 performs the microinjection at the peak of the angular velocity Ω when the microinjection is performed each time the microinjection is executed from the injector 13 that performs the learning control by the fuel injection valve control means 61. The angular velocity fluctuation amount ΔΩzfc is obtained by comparing with the peak of the angular velocity when not being detected. Thus, by executing the micro injection a plurality of times while changing the injection time ET, the relationship between the generated angular velocity fluctuation amount ΔΩzfc and the injection time ET can be obtained.

  At this time, as the peak of each angular velocity at the time of executing the micro injection at different injection times ET, for example, the peak value of the angular velocity when the micro injection at a certain injection time ET is executed once each may be used. it can. Alternatively, each micro injection of a certain injection time ET is executed a plurality of times, and the average value of the angular velocity peak at the time of each micro injection is used as the peak value of the angular velocity at the time of execution of the micro injection of that injection time ET. You can also.

  Further, the learning control means 66 can refer to data (data A in FIG. 3) showing the relationship between the actual injection amount Qact and the angular velocity fluctuation amount ΔΩzfc stored in advance in the control device 60, and the angular velocity fluctuation. The injection time ETZfc_act of the minute injection when the amount ΔΩzfc becomes the reference fluctuation amount ΔΩzfc0 is learned. This reference fluctuation amount ΔΩzfc0 is a value obtained in advance by experiments or the like as the value of the angular velocity fluctuation amount ΔΩzfc that occurs when fuel of the reference minute injection amount Qzfc0 is injected.

  In this way, when learning the injection time ETZfc_act, the difference in the angular velocity fluctuation amount ΔΩzfc0 that occurs even if the fuel of the same reference minute injection amount Qzfc0 is injected due to the difference in the combustion state of the fuel in the cylinder 41 of the internal combustion engine 40. Arise. Therefore, the learning control unit 66 performs learning control using the reference fluctuation amount ΔΩzfc0 corresponding to the combustion environment information detected by the combustion environment detection unit 65. That is, since the injection time ETZfc_act is obtained with the angular velocity fluctuation amount ΔΩ assumed when the fuel of the reference minute injection amount Qzfc0 is injected in the combustion environment when the learning control is executed as the reference fluctuation amount ΔΩzfc0, Regardless, the injection time Etzfc_act for injecting the fuel of the reference minute injection amount Qzfc0 is accurately obtained.

  In the control device 60 of the present embodiment, the value of the atmospheric pressure Pair is used as the combustion environment information, and when the fuel of the reference minute injection amount Qzfc0 is injected under the conditions of a plurality of atmospheric pressures PairA, PairB. The reference fluctuation amounts ΔΩzfc0A, ΔΩzfc0B,... Of the angular velocity Ω generated in FIG. The learning control unit 66 determines the current atmospheric pressure Pair_act based on the relationship between the detected atmospheric pressure Pair_act and the atmospheric pressure PairA, PairB... Corresponding to the stored reference fluctuation amounts ΔΩzfc0A, ΔΩzfc0B. The reference fluctuation amount ΔΩzfc0 corresponding to is obtained from the stored reference fluctuation amounts ΔΩzfc0A, ΔΩzfc0B,... By interpolation calculation. Therefore, even if the number of samples of the reference fluctuation amount ΔΩzfc0 to be stored is small, the injection time Etzfc_act for injecting the fuel of the reference minute injection amount Qzfc0 using the reference fluctuation amount ΔΩzfc0 corresponding to the current atmospheric pressure Pair_act is accurate. Desired.

  The correction coefficient calculation means 67 is an actual injection quantity Qtgt that is caused by an individual difference between a reference injector that is used as a reference when the injector control means 61 obtains a control amount of the injector 13 and an injector 13 that is actually used. A correction coefficient α for eliminating the deviation from the injection amount Qact is obtained. Variations in individual differences occur, for example, due to differences in the size of the injection hole of the injector 13, the stroke amount of the valve body, slidability, the degree of clogging of the injection hole, seat wear of the valve body, and the like. In the control device 60 of the present embodiment, the obtained correction coefficient α is used to correct the control amount of the injector 13 when performing auxiliary injection that is executed before main injection.

  Specifically, in the present embodiment, the control device 60 stores in advance a reference injection time Etzfc0 in which fuel of a predetermined reference micro-injection amount Qzfc0 is injected by the reference injector, and correction coefficient calculation means 67 , The ratio of the learned injection time ETZfc_act to the reference injection time Etzfc0 (ETzfc_act / ETzfc0) is determined as the correction coefficient α in the learning control execution target pressure Ptgt_cal for each injector 13 that has performed learning control. .

  When the correction coefficient α is obtained, the injector control means 61 multiplies the calculated target fuel injection amount Qtgt or energization time by the correction coefficient α. As a result, the fuel injection time by the injector 13 is corrected, and the error between the actual injection amount Qact and the target fuel injection amount Qtgt is reduced. In particular, in the control device 60 of the present embodiment, the injector control means 61 is configured to be able to execute auxiliary injection before the main injection in each cylinder 41, and the injector control means 61 is used when executing auxiliary injection. The control amount is corrected using a correction coefficient α. Since the correction coefficient α is obtained by executing the minute injection, the actual auxiliary injection amount after correcting the target auxiliary injection amount Qtgt_pilot or the energization time corresponding to this when the auxiliary injection is executed Qact_pilot can be made as close as possible to the target auxiliary injection amount Qtgt_pilot.

3. Flowchart of Control Method Next, a specific example of the control method of the accumulator fuel injection device 50 executed by the control device 60 described so far will be described based on the flowcharts of FIGS. 4 and 5. FIG. 4 is a flowchart showing the overall flow of the control method, and FIG. 5 is a flowchart specifically showing the control method.

  First, in step S1, the control device 60 detects a no fuel injection state. Specifically, after the accelerator operation amount Acc and the engine speed Ne are detected in step S11, the target fuel injection amount Qtgt is calculated in step S12, and the fuel is determined in step S13 based on the value of the target fuel injection amount Qtgt. It is determined whether or not there is a non-injection state.

  When the fuel non-injection state is detected, in step S2, the control device 60 sets the reference fluctuation amount ΔΩzfc0 for executing the learning control according to the current combustion environment information. Specifically, in the control device 60 of the present embodiment, after the atmospheric pressure Pair_act is detected in step S14, the stored reference fluctuation amounts ΔΩzfc0A, ΔΩzfc0B... And these reference fluctuation amounts ΔΩzfc0A are detected in step S15. , ΔΩzfc0B... And the detected atmospheric pressure Pair_act, a reference fluctuation amount ΔΩzfc0 corresponding to the current atmospheric pressure Pair_act is obtained.

  When the reference variation number ΔΩzfc0 is set, in step S3, the control device 60 executes learning control. Specifically, in step S16, the current learning control execution target pressure Ptgt_cal is set as the target rail pressure Ptgt, and in step S17, the rail pressure is controlled. Next, after the injector 13 that executes the learning control is selected in step S18, a plurality of micro injections are executed while changing the injection time ET in step S19.

  During the minute injection, the angular velocity Ω is read in step S20, and the angular velocity fluctuation amount ΔΩzfc is obtained for each injection time ET in step S21. Next, in step S22, an injection time Etzfc_act is obtained at which the value of the angular velocity fluctuation amount ΔΩzfc becomes the reference fluctuation number ΔΩzfc0 set in step S2 (S15). By the learning control performed in this way, the injection time Etzfc_act in which the fuel of the reference minute injection amount Qzfc0 is injected is accurately learned in the current combustion environment.

  When the injection time ETZfc_act is learned by the learning control, in step S4 (S23), the control device 60 performs the injection time Etzfc_act with respect to the reference injection time Etzfc0 that is assumed to be injected by the reference injector with the reference minute injection amount Qzfc0. Ratio (ETzfc_act / ETzfc0) is obtained and the value is updated as the correction coefficient α.

  As a result, in step S13 described above, when the target fuel injection amount Qtgt is not zero and it is determined that the fuel is not in the non-injection state, the process proceeds to step S24, where auxiliary injection before the main injection is executed. By multiplying the energization time obtained based on the target auxiliary injection amount Qtgt_pilot or the target auxiliary injection amount Qtgt_pilot and the rail pressure Prail by the correction coefficient α, the injection time of the auxiliary injection is corrected, and the injection amount at the time of executing the auxiliary injection is the target. It can be adjusted to the auxiliary injection amount Qtgt_pilot.

  When information other than atmospheric pressure is used as the combustion environment information, the same control can be performed by previously obtaining the reference fluctuation amount of the angular velocity Ω for each of a plurality of different values of the information by an experiment or the like. it can. A plurality of different types of combustion environment information may be used to obtain the reference variation number used for learning control.

  Further, the obtained correction coefficient α is not only used for correcting the control amount of the injector 13 at the time of performing auxiliary injection, but also used for correcting the control amount of the injector 13 when performing another injection such as main injection. it can.

1: fuel tank, 2: low pressure feed pump, 5: high pressure pump, 5a: pressurizing chamber, 7: plunger, 8: flow control valve, 10: common rail, 12: pressure control valve, 13: injector, 14: overflow valve 15: Fuel intake valve, 16: Fuel discharge valve, 18: Low pressure supply passage, 21: Rail pressure sensor, 30a, 30b, 30c: Return passage, 37: High pressure supply passage, 40: Internal combustion engine, 41: Cylinder, 42 : Piston, 43: Crankshaft, 44: Crank angle sensor, 50: Accumulated fuel injection device, 60: Control device, 61: Injector control means, 62: Non-injection state detection means, 63: Pressure control means, 64: Angular velocity Detection means, 65: Combustion environment detection means, 66: Learning control means, 67: Correction coefficient calculation means

Claims (4)

In a control apparatus for an accumulator fuel injection apparatus that controls an accumulator fuel injection apparatus having a common rail to which a plurality of injectors are connected to perform fuel injection control into a cylinder of an internal combustion engine.
Injector control means for determining the injection time based on the command injection amount and controlling the drive of the injector;
Combustion environment detection means for detecting combustion environment information in a cylinder of the internal combustion engine;
A non-injection state detecting means for detecting a fuel non-injection state to the internal combustion engine;
Pressure control means for controlling the pressure in the common rail to a predetermined pressure when the fuel non-injection state is detected;
After the fuel non-injection state is detected and the pressure becomes the predetermined pressure, the internal combustion engine when the micro-injection is executed by performing a plurality of micro-injections while changing the injection time by the injector control means. Learning control means for executing control for learning the injection time when the fluctuation amount of the crank angular speed of the engine becomes a reference fluctuation amount obtained by a preset reference injection amount;
Correction coefficient calculating means for calculating a correction coefficient when performing drive control of the injector using the reference injection time assumed to obtain the reference injection amount and the learned injection time;
The reference variation amount used for learning control is made different according to the value of the combustion environment information detected by the combustion environment detection means ,
The reference variation amount includes a plurality of reference variation amounts set according to the value of the combustion environment information,
The learning control means includes a value of each combustion environment information corresponding to the plurality of reference fluctuation amounts, a value of combustion environment information detected by the combustion environment detection means, a value of the plurality of reference fluctuation amounts, A control device for an accumulator fuel injection device, wherein a reference fluctuation amount used for the learning control is obtained based on The combustion environment detection unit, as the combustion environment information, claim 1, wherein the surrounding atmospheric pressure, cooling water temperature of the internal combustion engine, the periphery of the outside temperature, to detect either boost pressure of the internal combustion engine The control apparatus of the pressure-accumulation fuel injection device described in 1. 3. The accumulator fuel injection apparatus according to claim 1, wherein the correction coefficient is a correction coefficient for auxiliary injection that is executed before main injection in one cycle of the cylinder of the internal combustion engine. Control device. A pressure accumulation type fuel injection device provided with the control device according to any one of claims 1 to 3 .

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