JP2019152145A - Injection control device - Google Patents

Abstract

To provide an injection control device capable of appropriately acquiring valve opening timing or valve closing timing while suppressing an increase in the processing load even when allowing the operation of processing relating to fuel injection control on an operation system.SOLUTION: An engine control device functions as the injection control device for allowing the operation of processing relating to the control of an injector provided on an engine on the operation system. The engine control device acquires state information showing the state of the engine, and a detection result of detecting at least one of valve opening timing tvo and valve closing timing tvc of the injector. The engine control device executes acquisition processing Po for acquiring the detection result and arithmetic processing Pc for calculating an injection amount in one fuel injection by the injector on the basis of the state information, as one compound task TS2. The compound task TS2 is started before drive start timing tds of the injector.SELECTED DRAWING: Figure 2

Description

  The disclosure according to this specification relates to an injection control device that performs processing related to control of a fuel injection valve.

  Conventionally, for example, a fuel injection control device disclosed in Patent Document 1 includes a detection unit that detects opening and closing of an electromagnetic valve in an injector. The detection results of valve opening and closing by the detection unit are used by the control unit for drive control of the injector. A control part performs the process which acquires the detection result detected by the last fuel injection, and the process which calculates the injection amount by this fuel injection.

JP 2015-34492 A

  The process related to the fuel injection control as in Patent Document 1 can be operated on the operation system. In such an injection control device, it is conceivable that the acquisition process for acquiring the detection result of the on-off valve and the calculation process for calculating the injection amount are executed as separate tasks in the operation system. However, when these processes are executed as separate tasks, the processes required to generate individual tasks can increase.

  An object of the present disclosure is to provide an injection control device that can appropriately acquire a valve opening timing or a valve closing timing while suppressing an increase in a processing load even when processing related to fuel injection control is operated on an operation system. And

  In order to achieve the above object, one disclosed aspect is an injection control device that operates on an operation system a process related to control of a fuel injection valve (10) provided in an internal combustion engine (2). An information acquisition unit (51) for acquiring state information indicating the state of the internal combustion engine, and an on-off valve detection unit (52, 52) for detecting at least one of the valve opening timing (tvo) and the valve closing timing (tvc) of the fuel injection valve 70), an acquisition process (Po) for acquiring a detection result by the on-off valve detector, and a calculation process (Pc) for calculating an injection amount in one fuel injection in the fuel injection valve based on the state information. As a task (TS2) in FIG. 4, a calculation execution unit (53) that starts before the drive start timing (tds) of the fuel injection valve for performing fuel injection, It is provided injection control device.

  According to these aspects, the detection result acquisition process and the injection amount calculation process are started as one task before the drive start timing of the fuel injection valve. Therefore, the detection result obtained by detecting at least one of the valve opening timing and the valve closing timing in the previous fuel injection can be acquired before the start of the current fuel injection.

  In addition, if the calculation process of the injection amount is performed together with the detection result acquisition process, it is possible to reduce the process required to generate the task, rather than executing these processes as individual tasks. Therefore, even when processing related to fuel injection control is operated on the operation system, it is possible to appropriately acquire the valve opening timing or the valve closing timing while suppressing an increase in processing load.

  Note that the reference numbers in the parentheses merely show an example of a correspondence relationship with a specific configuration in an embodiment described later, and do not limit the technical scope at all.

It is a figure showing the whole fuel injection control system composition containing the engine control device by a first embodiment. It is a timing chart which shows the detail of each task performed with fuel injection. It is a timing chart which shows the detail of the process performed in one combustion cycle, Comprising: It is a figure which shows an example which adjusts a drive start timing. It is a timing chart which shows the detail of the process performed in one combustion cycle, Comprising: It is a figure which shows an example which adjusts a drive end timing. It is a figure for demonstrating that a drive start timing and a calculation start timing are set on the basis of the angle of a crankshaft. It is a flowchart which shows the detail of the main process in an injection control process. It is a flowchart which shows the detail of the process at the time of 450 degrees CA before a top dead center or the process at the time of 270 degrees CA before a top dead center. It is a flowchart which shows the detail of preceding time pre-processing. It is a flowchart which shows the detail of a drive completion timing process. It is a figure which shows the whole structure of the fuel-injection control system containing the engine control apparatus by 2nd embodiment.

  Hereinafter, a plurality of embodiments of the present disclosure will be described based on the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching | subjecting the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiment described above can be applied to the other part of the configuration. Moreover, not only the combination of the configurations explicitly described in the description of each embodiment, but also the configuration of a plurality of embodiments can be partially combined even if they are not explicitly described, as long as there is no problem in the combination. And the combination where the structure described in several embodiment and the modification is not specified shall also be disclosed by the following description.

(First embodiment)
The engine control apparatus 100 according to the first embodiment of the present disclosure is used in the fuel injection control system shown in FIG. The fuel injection control system is a system that controls the operation of a gasoline engine (hereinafter, “engine 2”), and includes a state sensor group 20, a plurality of injectors 10, an engine control device 100, and the like. The engine 2 is a spark ignition type internal combustion engine, and is mounted on a vehicle as a power source for generating power for traveling, for example.

  The state sensor group 20 is electrically connected to the engine control apparatus 100 directly or indirectly. The state sensor group 20 sequentially outputs detection results obtained by detecting the state of the engine 2 toward the engine control apparatus 100. The state sensor group 20 includes other sensors such as a rotation sensor 21, an air flow rate sensor 22, a water temperature sensor 23, an intake air temperature sensor 24, a fuel pressure sensor 25, and an accelerator position sensor.

  The rotation sensor 21 is, for example, an electromagnetic pickup. The rotation sensor 21 is combined with a signal rotor or the like to detect rotation of the crankshaft of the engine 2. The rotation sensor 21 sequentially outputs the detection result of the crankshaft angle to the engine control apparatus 100 as state information.

  The air flow rate sensor 22 is provided in an intake passage that is connected to each cylinder 2b. The air flow rate sensor 22 outputs a signal corresponding to the intake air amount sucked into each cylinder 2b as state information. The water temperature sensor 23 outputs a signal corresponding to the temperature of the cooling water for cooling the engine 2 as state information. The intake air temperature sensor 24 outputs a signal corresponding to the temperature of intake air taken into each cylinder 2b as state information. The fuel pressure sensor 25 outputs a signal corresponding to the pressure of the fuel supplied to each injector 10 as state information.

  The injector 10 is electrically connected to the engine control device 100. The injector 10 is inserted into an insertion hole 2c provided in the head member 2a of the engine 2, and is held by the head member 2a. The injector 10 is provided with a drive unit 12 such as an electromagnetic actuator and a piezoelectric actuator. The injector 10 opens and closes the nozzle hole 11 by applying a current or voltage to the drive unit 12. The injector 10 injects fuel from the injection holes 11 toward the combustion chambers of the respective cylinders 2b by the operation of opening and closing the injection holes 11 according to the control of the engine control device 100.

  The engine control apparatus 100 is an electronic control unit that controls the fuel supply to each cylinder 2b by the injector 10 based on the state information of the engine 2 acquired from the state sensor group 20. The engine control apparatus 100 controls each injector 10 so that fuel injection is performed a plurality of times (for example, three times) in one combustion cycle. The control circuit 50a of the engine control device 100 includes an injection valve drive unit 60, an opening / closing detection unit 70, a microcontroller (hereinafter, “microcomputer 50”), and the like.

  The injection valve drive unit 60 supplies power for opening the injection holes 11 to the drive units 12 of the injectors 10 based on a control signal input from the microcomputer 50. Electric power is supplied to the injection valve drive unit 60 from, for example, a vehicle battery. The injection valve drive unit 60 starts fuel injection from the injection hole 11 by supplying electric power to the drive unit 12 at a timing according to the control signal and causing displacement of the valve body in the valve opening direction. Moreover, the injection valve drive part 60 stops the fuel supply from the injection hole 11 by stopping the power supply to the drive part 12 at a timing according to the control signal and causing the valve body to be displaced in the valve closing direction. .

  The opening / closing detector 70 detects the movement of the injection valve that opens and closes the injection hole 11 in the injector 10. The open / close detection unit 70 measures a change in the drive current caused by the displacement of the injection valve for each injector 10. As shown in FIGS. 1 and 2, the open / close detection unit 70 sets a detection period Tvs in accordance with the open / close valve period of the injector 10. The starting point of the detection period Tvs is the drive start timing tds (described later) of the injector 10. The end point of the detection period Tvs is after a predetermined valve closing standby period Twc from the drive end timing tdf (described later) of the injector 10.

  The opening / closing detection unit 70 performs detection calculation for detecting both the valve opening timing tvo and the valve closing timing tvc in each injector 10 from the aspect of change in the drive current in the detection period Tvs. The open / close detection unit 70 holds the detection results of the valve opening timing tvo and the valve closing timing tvc, and outputs the detection results to the microcomputer 50 in response to a request from the microcomputer 50. The valve opening timing tvo is a timing at which fuel injection from the nozzle hole 11 is started. The valve closing timing tvc is a timing at which fuel injection from the nozzle hole 11 is terminated.

  The open / close detection unit 70 deletes the previous detection result at the start of the detection period Tvs. The open / close detection unit 70 holds only the valve opening timing tvo and the valve closing timing tvc in the immediately preceding fuel injection for one injector 10. The open / close detection unit 70 automatically updates the detection result by repeating the fuel injection in each injector 10.

  The microcomputer 50 is configured to have a processor and an input / output interface. The microcomputer 50 is electrically connected to the open / close detection unit 70 and the injection valve driving unit 60. The microcomputer 50 outputs a control signal toward the injection valve driving unit 60. The microcomputer 50 receives the detection result through communication (for example, SPI communication) with the open / close detection unit 70.

  The microcomputer 50 is provided with a storage unit 54. The storage unit 54 is a nonvolatile storage medium such as a flash memory. The storage unit 54 stores an operation system program executed by the microcomputer 50 and a plurality of application programs that operate on the operation system.

  The microcomputer 50 operates a built-in RTOS (Real-time operating system) such as OSEK. The microcomputer 50 operates various processes related to the control of each injector 10 as tasks on the operation system. A task is a group of execution units defined in the operation system. The operation system manages the execution state and priority of each task in an integrated manner, and performs scheduling so that many processes are sequentially executed by the microcomputer 50. The storage unit 54 may not be built in the microcomputer 50. The storage unit 54 may have a configuration of the engine control device 100 that is electrically connected to the microcomputer 50, or may be an aspect such as a memory card that is electrically connected to the engine control device 100.

  The microcomputer 50 constructs a plurality of functional units related to the fuel injection control by executing the injection control program stored in the storage unit 54. Specifically, in the microcomputer 50, an information acquisition unit 51, an operation execution unit 53, and the like are constructed as functional units.

  The information acquisition unit 51 acquires state information indicating the state of the engine 2 from the state sensor group 20. The acquisition of the state information by the information acquisition unit 51 is repeatedly performed at a predetermined cycle. The latest state information acquired by the information acquisition unit 51 is used for calculation for engine control in the microcomputer 50.

  The calculation execution unit 53 generates a control signal output from the microcomputer 50 to the injection valve driving unit 60 based on the state information acquired by the information acquisition unit 51. Based on the state information, the calculation execution unit 53 calculates the total amount of fuel injected into each cylinder 2b in a single combustion cycle, the number of fuel injections performed in a single combustion cycle, and the injection at each fuel injection. The injection amount and injection time to be performed, and the timing of the on-off valve are set. In the following description, the combustion (expansion) stroke, the exhaust stroke, the intake stroke, and the compression stroke are defined as one combustion cycle.

  The injection time set by the calculation execution unit 53 is the time from the drive start timing tds instructing start of power supply to the drive unit 12 to the drive end timing tdf instructing stop of power supply. The calculation execution unit 53 defines the drive start timing tds and the drive end timing tdf for each fuel injection by a control signal. The valve opening timing tvo of the injector 10 is later than the drive start timing tds. Similarly, the valve closing timing tvc of the injector 10 is later than the driving end timing tdf.

  The calculation execution unit 53 performs the acquisition process Po and the calculation process Pc. In the acquisition process Po, the detection result by the opening / closing detection unit 70 is acquired by communication, and the process for determining the valve opening timing tvo and the valve closing timing tvc is performed for the immediately preceding fuel injection. As described above, since the previous detection result is cleared at the drive start timing tds that is the start point of the detection period Tvs, the acquisition process Po needs to be completed before the drive start timing tds.

  In the calculation process Pc, a process related to the generation of the control signal, for example, a process of setting an injection amount, an injection time, and each execution timing in each fuel injection is performed. As shown in FIGS. 3 and 4, the calculation process Pc is performed twice in principle for each fuel injection.

  As shown in FIGS. 1 to 3, the calculation execution unit 53 executes each task including the acquisition process Po and the calculation process Pc on the operation system in accordance with the rotation of the crankshaft (output shaft) of the engine 2. . The calculation execution unit 53 executes the acquisition process Po after the execution of the task generation process Pt in the task performing the acquisition process Po (hereinafter, “acquisition task TSo”). Similarly, the calculation execution unit 53 executes the calculation process Pc after the execution of the task generation process Pt in the task for performing the calculation process Pc (hereinafter, “calculation task TSc”). Furthermore, the calculation execution unit 53 can generate a composite task TS2 that sequentially executes the acquisition process Po and the calculation process Pc after the execution of the task generation process Pt.

  3 and 4, as an example of the fuel injection pattern, it is assumed that fuel injection is performed once in the intake stroke and twice in the compression stroke in one combustion cycle. Details of each task set by the calculation execution unit 53 in such fuel injection will be described below with reference to FIGS. 1 and 2 based on FIGS. 3 and 4.

  In the fuel injection pattern shown in FIG. 3, the injection mode of fuel injection in the intake stroke is set by the first calculation performed during the exhaust stroke. For the injection calculation in the intake stroke, the calculation execution unit 53 starts the calculation task TSc at a timing when the crank position is 450 ° before the top dead center. In this calculation task TSc, a fuel injection drive start timing tds and a drive end timing tdf in the intake stroke are set. Furthermore, the calculation start timing tcs for starting the injection recalculation of the intake stroke is set substantially simultaneously with the drive start timing tds. According to such setting, the timer set process for starting the calculation start timing tcs before the drive start timing tds becomes unnecessary. Therefore, the processing load on the microcomputer 50 is reduced.

  When the crank position reaches the calculation start timing tcs, a calculation task TSc for recalculation is started. Further, in accordance with the start of the calculation task TSc, the drive current detection calculation by the open / close detection unit 70 is started. When the recalculation by the computation task TSc is completed, the drive end timing tdf is reset based on the calculated injection period.

  The injection mode of each fuel injection in the compression stroke is set together by the first calculation performed during the intake stroke. For the injection calculation in the compression stroke, the calculation execution unit 53 starts the calculation task TSc at a timing when the crank position becomes 270 ° before the top dead center. In this calculation task TSc, the drive start timing tds and drive end timing tdf of each fuel injection in the compression stroke, and each calculation start timing tcs for starting recalculation of the injection amount and the injection time are set.

  In the injection recalculation in the compression stroke, the composite task TS2 that continuously executes the acquisition process Po and the calculation process Pc is executed. Each calculation start timing tcs is set before the preceding time Tpt with respect to the drive start timing tds. The preceding time Tpt is set to such a value (for example, 300 μsec) that the acquisition process Po is completed before the drive start timing tds and the calculation process Pc is completed before the drive end timing tdf of the injector 10. The

  When the crank position reaches the calculation start timing tcs of the second fuel injection, the composite task TS2 is started. By the acquisition process Po of the composite task TS2, the detection result of the opening / closing detector 70 in the fuel injection in the intake stroke is acquired, and the valve opening timing tvo and the valve closing timing tvc in the previous fuel injection are determined.

  Then, the drive start timing tds is reset by recalculation of the injection amount and the injection time in the calculation process Pc. By adjusting the drive start timing tds, the injection amount in the second fuel injection is changed to a value reflecting the latest state information. The drive current detection calculation by the open / close detection unit 70 is started with the drive start timing tds as a starting point.

  When the crank position reaches the calculation start timing tcs of the third fuel injection, the composite task TS2 is started. The valve opening timing tvo and the valve closing timing tvc of the second fuel injection are determined by the acquisition process Po of the composite task TS2. Furthermore, the driving start timing tds in the third fuel injection is reset by the calculation process Pc of the composite task TS2. As described above, when the adjustment of the injection time is performed by changing the drive start timing tds, the time interval Ti between the drive end timing tdf and the ignition timing is maintained.

  Then, the detection period Tvs in the opening / closing detection unit 70 is set with the reset driving start timing tds as a starting point. The detection results of the valve opening timing tvo and the valve closing timing tvc in the third fuel injection are acquired by the calculation execution unit 53 by the acquisition task TSo started in the exhaust stroke after ignition (for example, 540 ° before top dead center). Is done.

  The fuel injection pattern shown in FIG. 4 is different from the fuel injection pattern shown in FIG. 3 in the method for adjusting the injection time of fuel injection in the compression stroke. In the second injection and the third injection in FIG. 4, the drive end timing tdf is changed based on the injection time recalculated by the calculation process Pc of the composite task TS2. In this case, the calculation process Pc in the composite task TS2 may not be completed before the drive start timing tds. Therefore, when the drive end timing tdf is changed, the preceding time Tpt can be defined to be shorter than when the drive start timing tds is changed. As a result, it is possible to recalculate the injection amount at a timing closer to the start of injection.

  In each fuel injection in the compression stroke described above, as shown in FIG. 5, the drive start timing tds and the calculation start timing tcs are both set based on the angle of the crankshaft. That is, the timer Tmd that counts the drive start timing tds and the timer Tmt that counts the calculation start timing tcs are both timers whose values are decreased by rotation of the crankshaft. With such a setting, even when the rotational speed of the crankshaft fluctuates, the longitudinal relationship between the drive start timing tds and the calculation start timing tcs is maintained. As a result, the composite task TS2 is started before the drive start timing tds.

  Details of the injection control process performed by the microcomputer 50 will be further described with reference to FIG. 1 based on FIGS. The injection control process shown in FIGS. 6 to 9 is started by starting the engine 2 and repeatedly started until the engine 2 is stopped.

  In S <b> 11 of the main process shown in FIG. 6, the crankshaft angle (angular position) is determined based on the state information detected by the rotation sensor 21. If the crank position is 450 ° or 270 ° before top dead center in S11, the process proceeds to S12. In S12, processing at 450 ° CA before top dead center or processing at 270 ° CA before top dead center (see FIG. 7) is executed, and the main processing is temporarily terminated.

  If it is determined in S11 that the crank position is neither 450 ° nor 270 ° before top dead center, the process proceeds to S13. In S13, it is determined whether or not the preceding time Tpt of the drive start timing tds, which is a reset timing. The reset timing in S13 is set in S103 or S106 (see FIG. 7) described later. If it is determined in S13 that the reset timing is reached, the process proceeds to S14. In S14, the preceding time pre-processing (see FIG. 8) is executed, and the main processing is temporarily terminated.

  When it is determined in S13 that it is not the reset timing, the process proceeds to S15. In S15, it is determined whether or not the drive end timing tdf has been reached. If it is determined in S15 that the driving end timing tdf is not reached, the main process is temporarily ended. On the other hand, when it determines with it being drive end timing tdf in S15, it progresses to S16. In S16, a drive end timing process (see FIG. 9) is executed, and the main process is temporarily ended.

  In the processing at 450 ° CA before top dead center or the processing at 270 ° CA before top dead center shown in FIG. 7, each timing in the intake stroke injection or the compression stroke injection is temporarily set. Specifically, in S101, the angular position of the crankshaft is determined as in S10. If it is determined in S101 that the crank position is 450 ° before top dead center, the process proceeds to S102. In S102, the total injection amount, injection time, drive start timing tds, and the like required for one fuel injection performed at the intake pressure range are calculated, and the process proceeds to S103.

  In S103, the start timing (calculation start timing tcs) of the preceding time preprocessing for recalculating the injection amount and the injection time is set before the driving start timing tds calculated in S102, and the process proceeds to S104. . In S104, the drive start timing tds calculated in S102 is set, and the process ends. In S103 and S104, each start timing is set with reference to the angle of the crankshaft.

  If it is determined in S101 that the crank position is 270 ° before top dead center, the process proceeds to S105. In S105, the total injection amount required for the two fuel injections performed in the compression stroke, the respective injection times, and the drive start timing tds are calculated, and the process proceeds to S106.

  In S106, the start timing (calculation start timing tcs) of the preceding time preprocessing for recalculating the injection amount and the injection time is set before the driving start timing tds calculated in S105 by the preceding time Tpt, and the process proceeds to S107. . In S107, the drive start timing tds calculated in S105 is set, and the process ends. Also in S106 and S107, each start timing is set on the basis of the angle of the crankshaft.

  In the preceding time pre-processing shown in FIG. 8, the above-described composite task TS2 is executed, and the previous opening / closing valve timing is determined and the current injection time is adjusted. In S111, the detection result is acquired from the open / close detection unit 70 by communication by executing the acquisition process Po. Then, the valve opening timing tvo and the valve closing timing tvc in the previous fuel injection are determined, and the process proceeds to S112.

  In S112, the stroke of the fuel injection being performed is determined. If it is determined in S112 that the intake stroke is being injected, the process proceeds to S113. In S113, recalculation of the injection amount and the injection time in the fuel injection in the intake stroke is performed, and the process proceeds to S114. In S114, the drive end timing tdf is reset based on the injection time recalculated in S113, and the process ends.

  On the other hand, when it determines with injection of a compression stroke being performed in S112, it progresses to S115. In S115, recalculation of the injection amount and the injection time in the fuel injection in the compression stroke is performed, and the process proceeds to S116. In S116, the remaining time until the drive start timing tds is determined. Specifically, if it is determined in S116 that the remaining time until the drive start timing tds is less than the first threshold time (for example, 20 μs), the process proceeds to S117. In S117, based on the injection time recalculated in S115, the drive end timing tdf is reset, and the process ends.

  On the other hand, if it is determined in S116 that the remaining time until the drive start timing tds is equal to or longer than the first threshold time, the process proceeds to S118. In S118, when the drive start timing tds is corrected earlier than the temporarily set time, it is determined whether or not the remaining time until the corrected drive start timing tds is secured for a second threshold time (for example, 10 μsec) or more. . If it is determined in S118 that the remaining time until the corrected drive start timing tds is less than the second threshold time, the process proceeds to S117, and the drive end timing tdf is reset. On the other hand, when it determines with remaining time being more than 2nd threshold time in S118, it progresses to S119. In S119, the drive start timing tds is reset, and the process ends.

  In S121 of the drive end timing process shown in FIG. 9, it is determined whether additional injection setting is necessary. If it is determined in S121 that the injected fuel amount has substantially reached the requested injection amount, it is determined that no additional injection setting is necessary, and the process is terminated. On the other hand, if it is determined in S121 that the injected fuel amount is smaller than the requested total injection amount, it is determined that additional injection setting is necessary, and the process proceeds to S122.

  In S122, the next fuel injection drive start timing tds is set, and the process proceeds to S123. In S123, the preceding time Tpt is converted into an angle based on the latest value of the rotational speed of the engine 2 in the state information, and the process proceeds to S124. In S124, using the angle value converted in S123, the start timing of the next preceding time pre-processing is set, and the processing ends.

  As described so far, the calculation execution unit 53 acquires the detection result of the previous fuel injection before the current drive start timing tds in order to avoid the deletion of the detection result in the opening / closing detection unit 70. There is a need. On the other hand, for the injection amount control reflecting the latest state information, it is desirable that the recalculation of the injection amount is started almost simultaneously with the drive start timing tds. For these reasons, it is conceivable to execute the acquisition process Po and the calculation process Pc as separate tasks TSo and TSc. However, if these processes Po and Pc are executed as individual tasks TSo and TSc, it is necessary to execute the task generation process Pt for each task.

  Therefore, in the first embodiment, the acquisition process Po and the calculation process Pc are started as one composite task TS2 before the drive start timing tds of the injector 10. Therefore, the detection result of detecting the valve opening timing tvo and the valve closing timing tvc in the previous fuel injection can be acquired before the start of the current fuel injection.

  In addition, if the calculation process Pc is performed together with the acquisition process Po, the task generation process Pt can be reduced rather than executing these processes as individual tasks. Therefore, even when processing related to fuel injection control is operated on the operation system, it is possible to appropriately acquire the valve opening timing tvo and the valve closing timing tvc while suppressing an increase in processing load.

  Furthermore, the calculation process Pc in the composite task TS2 can be started immediately before the drive start timing tds. Therefore, the latest state information in the engine 2 can be reflected in the injection amount recalculated in the calculation process Pc. Therefore, the engine control apparatus 100 can grasp the latest state of the engine 2 and can ensure the accuracy of the injection amount calculation.

  Moreover, the reduction effect of the task generation process Pt by performing the acquisition process Po and the calculation process Pc in one composite task TS2 is that the more the number of divided injections performed in one combustion cycle, the more the engine 2 The greater the number of cylinders 2b, the more prominent.

  Furthermore, for example, when the interval between the second injection and the third injection is shortened, if the acquisition process Po and the calculation process Pc are to be executed in separate tasks TSo, TSc, the calculation process Pc and the acquisition process Po The processing order can be changed. However, if the acquisition process Po and the calculation process Pc are grouped as one composite task TS2, the processing order of executing the calculation process Pc after the acquisition process Po is maintained. Therefore, since the case classification for preventing the change of the processing order is unnecessary, the content of the injection control process can be simplified. Further, even when the fuel injection interval is set short, the acquisition of the valve opening timing tvo and the valve closing timing tvc is appropriately performed.

  In addition, the preceding time Tpt in the first embodiment is defined such that the acquisition process Po in the composite task TS2 is completed before the drive start timing tds in consideration of the processing time required for the acquisition process Po. Therefore, the calculation execution unit 53 can determine the valve opening timing tvo and the valve closing timing tvc in the previous fuel injection before being updated by the detection result in the fuel injection.

  Further, the preceding time Tpt in the first embodiment is defined such that the calculation process Pc in the composite task TS2 is completed before the drive end timing tdf. Therefore, the calculation execution unit 53 can update the temporarily set information with information recalculated using the new state information. As a result, the injection amount based on the latest state information can be supplied to each cylinder 2b by the injector 10.

  Furthermore, the calculation execution unit 53 of the first embodiment completes the calculation process Pc in the composite task TS2 before the drive start timing tds, and then adjusts the drive start timing tds based on the recalculated injection amount. With such an adjustment, even if the injection amount is changed, the drive end timing tdf and thus the valve closing timing tvc are not substantially changed. Therefore, the injection amount in the fuel injection can be corrected while maintaining the time interval Ti with the ignition timing.

  In addition, the calculation execution unit 53 of the first embodiment can change the drive end timing tdf based on the injection amount recalculated in the calculation process Pc of the composite task TS2. If the adjustment of the drive end timing tdf is allowed, the start timing of the calculation process Pc can be delayed and newer state information can be used for recalculation of the injection amount. As a result, highly accurate injection amount control reflecting the latest state of the engine 2 is possible.

  In the first embodiment, the drive start timing tds and the calculation start timing tcs of the composite task TS2 are both set based on the rotation angle of the crankshaft. Therefore, even when the rotational speed of the crankshaft fluctuates, the order of the drive start timing tds and the calculation start timing tcs can be appropriately maintained without being switched.

  In the first embodiment, the engine 2 corresponds to an “internal combustion engine”, the injector 10 corresponds to a “fuel injection valve”, the microcomputer 50 corresponds to a “processing unit”, and the engine control device 100 performs “injection control”. It corresponds to "apparatus". The composite task TS2 corresponds to “task”, the calculation start timing tcs corresponds to “(task) start timing”, and the preceding time Tpt corresponds to “predetermined time”.

(Second embodiment)
The second embodiment of the present disclosure shown in FIG. 10 is a modification of the first embodiment. In the second embodiment, the configuration of the control circuit 250a of the engine control device 200 is different from that of the first embodiment. In the second embodiment, an open / close detection unit 52 having substantially the same function as the open / close detection unit 70 (see FIG. 1) is provided together with the information acquisition unit 51 and the calculation execution unit 53 as one of the functional units of the microcomputer 250. ing.

  The open / close detection unit 52 uses the function of an AD converter provided in the microcomputer 250 as an input interface. The open / close detection unit 52 performs AD conversion of the drive current applied to the injector 10 at a specific sampling period (for example, every 1 μsec) in the same detection period Tvs (see FIG. 2) as in the first embodiment. The open / close detection unit 52 detects the valve opening timing tvo and the valve closing timing tvc (see FIG. 2) based on the change mode of the drive current indicated by the accumulated AD conversion result. The detection results of the valve opening timing tvo and the valve closing timing tvc are acquired by the calculation execution unit 53 by the acquisition process Po. The open / close detection unit 52 holds the AD conversion result and the detection result until the next detection period Tvs, and clears the AD conversion result and the detection result at the drive start timing tds of the next fuel injection.

  Also in the second embodiment described so far, if the acquisition process Po and the calculation process Pc are executed by a series of composite tasks TS2, the timings tvo and tvc of the on-off valve can be appropriately acquired. Therefore, even if the open / close detection unit 52 is a functional unit of the microcomputer 250, the same effect as in the first embodiment is obtained. In the second embodiment, the microcomputer 250 corresponds to a “processing unit”, and the engine control device 200 corresponds to an “injection control device”.

(Other embodiments)
Although a plurality of embodiments of the present disclosure have been described above, the present disclosure is not construed as being limited to the above embodiments, and can be applied to various embodiments and combinations without departing from the gist of the present disclosure. can do.

  In the composite task TS2 in the above embodiment, the acquisition process Po and the calculation process Pc are executed continuously. However, another process may be executed between the acquisition process Po and the calculation process Pc. That is, the composite task TS2 may include processes different from the task generation process Pt, the acquisition process Po, and the calculation process Pc.

  The length of the preceding time Tpt in the above embodiment can be changed as appropriate. As in the above-described embodiment, the preceding time Tpt may be defined such that the calculation process Pc is completed before the temporarily set drive start timing tds, and is specified so that the calculation process Pc is completed during the drive period. May be.

  Furthermore, the preceding time in the first fuel injection (see the second injection in FIG. 3) and the preceding time in the next fuel injection (see the third injection in FIG. 3) in the compression stroke may be different. For example, the fuel injection immediately before ignition may be provided with a longer preceding time than the first fuel injection so that the injection time can be adjusted by changing the drive start timing tds.

  In the fuel injection in the intake stroke of the above embodiment, the calculation task TSc is started from the drive start timing tds. However, the calculation execution unit may omit the acquisition task TSo at 540 ° before top dead center and start the composite task TS2 before the preceding time Tpt of the drive start timing tds.

  In the fuel injection pattern described in the above embodiment, the number of injections in the intake stroke is only one. However, multiple divided injections may be performed in the intake stroke. In this case, the adjustment of the injection amount based on the recalculation may be realized by changing either the drive start timing tds or the drive end timing tdf. Furthermore, the number of injections in the compression stroke may be changed as appropriate.

  In the embodiment described above, the case where only the drive start timing is changed (see FIG. 3) and the case where only the drive end timing is changed (see FIG. 4) are exemplified. However, the adjustment of the injection amount may be realized by adjusting both the drive start timing and the drive end timing.

  In the microcomputer of the above embodiment, the drive start timing, the calculation start timing, the on-off valve timing, and the like are set by associating with the crankshaft angle. However, each timing may be set in association with the time counted in the microcomputer.

  In the opening / closing detection unit and the acquisition process of the above embodiment, both the valve opening timing and the valve closing timing are acquired. However, in the on-off valve detector and the acquisition process, it is only necessary to acquire at least one of the valve opening timing and the valve closing timing. For example, the calculation execution unit may acquire only the valve opening timing in the acquisition process, or may acquire only the valve closing timing.

  In the above embodiment, the function provided by the control circuit of the engine control device can be provided by hardware and software different from those described above, or a combination thereof. For example, the engine control device may be an electronic control unit that includes only a configuration corresponding to a microcomputer and outputs a control signal to a drive device having a function corresponding to an injection valve drive unit. The RTOS incorporated in the microcomputer is not limited to OSEK, and may be changed as appropriate.

  In the above-described embodiment, the example in which the injection control method of the present disclosure is applied to the engine control apparatus that controls gasoline injection by the fuel injection valve has been described. However, the above injection control method can also be applied to an engine control apparatus that controls a fuel injection valve that injects fuel other than gasoline, such as light oil.

  The engine control device of the above embodiment has been used in a fuel injection control system that controls an engine mounted on a vehicle. However, the engine to be controlled by the engine control device is not limited to a power engine mounted on a vehicle, and may be an engine mounted on various transport equipment and an engine used for various consumer equipment.

2 engine (internal combustion engine), 10 injector (fuel injection valve), 50, 250 microcomputer (processing unit), 51 information acquisition unit, 52, 70 open / close detection unit, 53 arithmetic execution unit, 54 storage unit, 100, 200 engine control Device, Pc calculation process, Po acquisition process, TSo acquisition task, TSc calculation task, TS2 composite task (task), Tpt preceding time (predetermined time), tcs calculation start timing (start timing), tds drive start timing, tdf drive end Timing, tvc valve closing timing, tvo valve opening timing

Claims (7)

An injection control device for operating processing related to control of a fuel injection valve (10) provided in an internal combustion engine (2) on an operation system,
An information acquisition unit (51) for acquiring state information indicating the state of the internal combustion engine;
An on-off valve detector (52, 70) for detecting at least one of a valve opening timing (tvo) and a valve closing timing (tvc) in the fuel injection valve;
The operation system includes an acquisition process (Po) for acquiring a detection result by the on-off valve detector, and an arithmetic process (Pc) for calculating an injection amount in one fuel injection in the fuel injection valve based on the state information. As a task (TS2) in FIG. 4, a calculation execution unit (53) that starts before the drive start timing (tds) of the fuel injection valve for performing the fuel injection,
An injection control device comprising:   The calculation execution unit sets the task start timing (tcs) before a predetermined time (Tpt) of the drive start timing so that the acquisition process is completed before the drive start timing. The injection control device described.   The calculation execution unit sets the task start timing (tcs) to a predetermined time before the drive start timing so that the calculation process is completed before the fuel injection valve drive end timing (tdf). The injection control device according to claim 1 or 2.   The said control execution part is an injection control apparatus as described in any one of Claims 1-3 which further calculates the injection time based on the said injection quantity in the said calculation process. The calculation execution unit
The task start timing (tcs) is set before a predetermined time (Tpt) of the drive start timing so that the arithmetic processing is completed before the drive start timing,
The injection control device according to claim 4, wherein the drive start timing is adjusted based on the injection time calculated in the calculation process.   The injection control device according to claim 4, wherein the calculation execution unit adjusts the drive end timing (tdf) of the fuel injection valve based on the injection time calculated in the calculation process.   The injection control device according to claim 1, wherein the calculation execution unit sets the drive start timing and the task start timing (tcs) with reference to an angle of an output shaft of the internal combustion engine. .

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