JP2017193992A - Engine control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a period as short as possible that a generation of an angle clock of shorter period than that of a crank signal generated upon rotation of crank shaft of an engine is stopped.SOLUTION: A missing judgement part 32 of a missing judgement device 30 judges it by a software whether or not a pulse of a crank signal generated at this time is a starting pulse of the missing part. A clock generating device 50 comprises a period calculation part 58, an angle counter 54, a clock generating part 60, a stopping judgement part 56 and a target setting part 58. The period calculation part calculates a clock period of the angle clock by the software. The clock generating part generates an angle clock until the angle counter for counting the angle clock reaches a target count number. When the pulse generated at this time is not judged that it is the starting pulse and the generation of the angle clock is stopped at the missing part, the target setting part sets by a software the target counted number that the angle counter reaches when a finish pulse at the missing part is generated.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a technique for generating an angle clock having a shorter period than a crank signal generated with rotation of a crankshaft of an engine.

  A technique for controlling an engine based on a rotational angle position of a crankshaft represented by a crank signal generated with the rotation of the crankshaft of the engine is known. Then, as disclosed in Patent Document 1, an angle clock having a shorter cycle than the crank signal is generated by dividing the cycle of the crank signal by the multiplication number, and the accuracy is higher than that based on the crank signal based on the angle clock. In addition, a technique for executing engine control is known.

  The crank signal has a pulse train having a pulse that is generated every time the crankshaft of the engine rotates by a certain angle, and a missing portion in which the pulse is missing and the angular interval between the pulses is larger than the pulse train. .

  In Patent Document 1, a CPU counts the number of pulses of a crank signal by software, and dedicated hardware for generating an angle clock generates an angle clock. When the CPU counts the number of pulses of the crank signal, it is determined by software whether or not it is a missing part, and the number of pulses is counted by software assuming that a pulse is generated at the same angular interval as the pulse train in the missing part. .

Japanese Patent Laying-Open No. 2015-151945

  In contrast to the technique described in Patent Document 1, it is conceivable to generate an angle clock with a general-purpose processing device instead of dedicated hardware. Since a general-purpose processing apparatus does not include dedicated hardware for generating an angle clock, the angle clock is generated by software.

  When a crank signal pulse is generated, a processing device that generates an angle clock, for example, calculates a value obtained by dividing the pulse period of the current pulse and the previous pulse by a multiplication number between the current pulse and the next pulse. The clock cycle of the angle clock to be generated is used. When a processing device that generates an angle clock is notified by another processing device that it has been determined to be a missing portion, it generates an angle clock of the number of clocks corresponding to the angular interval of the missing portion.

  Here, for example, if another software process is executed in each processing device in the missing part, the missing part determination process by software may be delayed, and the execution of the angle clock generation process in the missing part may be delayed.

  If the generation of the angle clock in the missing part is delayed and there is a period in which the angle clock is not generated, the start of engine control executed based on the angle position indicated by the angle clock is delayed, and engine control is not executed at an appropriate timing There is.

One aspect of the present disclosure is to provide a technique for shortening as much as possible a period in which generation of an angle clock having a shorter period than a crank signal generated with rotation of a crankshaft of an engine is stopped.

The engine control device according to one aspect of the present disclosure includes a missing determination device (30) and a clock generation device (50).
The missing determination device is a crank signal having a pulse train having a pulse generated every time the crankshaft of the engine rotates by a certain angle, and a missing portion in which the pulse is missing and the angular interval between the pulses is larger than the pulse train. , A missing determination unit (32, S420 to S438) configured to determine by software whether or not the pulse generated this time is a start pulse indicating the start of the missing portion is provided.

  The clock generation device includes a period calculation unit (58, S400 to S408, S466 to S470, S480 to S488, S510 to S514), an angle counter (54), a clock generation unit (60), and a stop determination unit (56, 58, S500 to S504) and a target setting unit (58, S456, S458, S462, S464, S506, S508).

  Each time a pulse is generated, the period calculation unit uses a software to divide the value obtained by dividing the pulse period between the pulse generated this time and the pulse generated last time by a multiplication factor set in advance according to the angular interval between the pulses. It is configured to calculate as the clock period of the angle clock. The angle counter counts the number of angle clocks.

  The clock generation unit is configured to generate an angle clock at a clock cycle calculated by the cycle calculation unit until the angle counter reaches a target count number set every time a pulse is generated. The stop determination unit is configured to determine whether or not the generation of the angle clock by the clock generation unit in the missing part is stopped by at least hardware among hardware and software.

  The target setting unit is configured to set the target count number reached by the angle counter by software when the missing determination unit determines that the pulse generated this time is a start pulse, when an end pulse indicating the end of the missing part is generated. Has been.

  If the missing determination unit does not determine that the pulse generated this time is the start pulse, and the stop determination unit determines that the generation of the angle clock is stopped in the missing portion, the target setting unit Is configured to set the target count number reached by the angle counter when software occurs, and the cycle calculation unit is used to calculate the clock cycle of the angle clock generated by the clock generation unit before the end pulse is generated. It is configured.

  According to this configuration, when the stop determination unit determines at least by hardware that the generation of the angle clock is stopped in the missing part, the target setting unit determines the target count number that the clock counter reaches when the end pulse is generated. Set by software. When the target count number reached by the clock counter when the end pulse is generated is set, the clock generation unit starts generating the angle clock.

  Therefore, even if the generation of the angle clock is stopped at the missing portion, the generation of the angle clock can be started as soon as possible, and the period during which the generation of the angle clock is stopped can be shortened as much as possible.

  Note that the reference numerals in parentheses described in this column and in the claims indicate the correspondence with the specific means described in the embodiment described later as one aspect, and the technical scope of the present invention. It is not limited.

The block diagram which shows the engine control apparatus of 1st Embodiment. The flowchart which shows the pulse detection process by a timer exclusive processor. The flowchart which shows the missing tooth determination process by main CPU. The flowchart which shows the missing tooth pre-processing by the processor only for a timer. The flowchart which shows the process at the time of abnormality by a timer exclusive processor. The time chart which shows the clock generation process at the time of normal. The time chart which shows the clock generation process at the time of abnormality. The flowchart which shows the pulse detection process by the processor only for timers of 2nd Embodiment. The flowchart which shows the abnormality determination process by a timer exclusive processor. The time chart which shows the clock generation process at the time of abnormality.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
[1. First Embodiment]
[1-1. Constitution]
An ECU 10 shown in FIG. 1 is mounted on a vehicle and includes an input circuit 12, an output circuit 14, and a microcomputer 20. ECU is an abbreviation for Electronic Control Unit, and microcomputer is an abbreviation for microcomputer.

  The input circuit 12 inputs a crank signal from the crank angle sensor and inputs a cam signal from the cam angle sensor. The ECU 10 determines the cylinder of the engine based on the crank signal and the cam signal. The crank signal is a pulse signal generated when the crank angle sensor detects teeth installed at a constant angular interval on the outer periphery of the crank rotor rotating together with the crankshaft. The crank rotor has a missing tooth portion in which teeth are continuously missing.

  Therefore, the crank signal has a pulse train having a pulse generated every time the crankshaft rotates by a certain angle, and a missing tooth portion in which no pulse is generated and the angular interval between the pulses is larger than that of the pulse train. ing. The missing tooth portion indicates a reference position in the rotation direction of the crankshaft. In this embodiment, two teeth are missing at the missing tooth portion. Therefore, the angular interval between pulses in the missing tooth portion is three times the angular interval between pulses in the pulse train.

The cam signal has a pulse generated at a position corresponding to the missing tooth portion of the crank signal on the outer periphery of the cam rotor that rotates together with the cam shaft.
The output circuit 14 outputs a signal output from the compare unit 56 of the timer control module 50 to the ignition module and the injection module. The ignition module is a spark plug and a spark plug drive circuit. The injection module is an injector and a drive circuit for the injector. The signal output from the compare unit 56 indicates the angular timing at which the ignition module executes ignition of fuel, and the angular timing at which the injection module executes fuel injection.

  The microcomputer 20 includes a main CPU 30, a dedicated RAM 40 for the main CPU 30, a ROM 42, a shared RAM 44, and a timer control module 50. The main CPU 30 and the timer control module 50 are general-purpose processing devices.

  Each function of the microcomputer 20 is realized by the main CPU 30 and the timer control module 50 executing a program stored in a non-transitional physical recording medium such as a ROM or a flash memory. By executing this program, a method corresponding to the program is executed.

  The main CPU 30 executes engine control including generation of an angle clock by executing a control program stored in the ROM 42. For example, the main CPU 30 sets the angle timing at which the ignition control and the fuel injection control are executed next time as engine control other than the generation of the angle clock in the compare unit 56 via the timer dedicated processor 58.

  The dedicated RAM 40 of the main CPU 30 stores data used by the main CPU 30 for engine control including angle clock generation. For example, the dedicated RAM 40 stores an edge counter, a maximum edge position, an edge position of the start pulse of the missing tooth portion, an edge position of a pulse generated before the start pulse of the missing tooth portion, and the like.

  The shared RAM 44 stores data commonly referred to by the main CPU 30 and the timer dedicated processor 58. For example, the shared RAM 44 stores a missing tooth flag 1, a missing tooth flag 2, a missing tooth number, an abnormality processing flag, and the like, which will be described later.

  The timer control module 50 includes an edge detection unit 52, a counter unit 54, a compare unit 56, a timer dedicated processor 58, a clock generation unit 60, and RAM and ROM (not shown).

  The edge detector 52 detects the edge of the pulse of the crank signal. The edge of the pulse detected by the edge detector 52 may be either a rising edge or a falling edge. The edge detection unit 52 stores the time when the edge of the pulse of the crank signal is detected.

  The counter unit 54 includes various counters. The counter unit 54 includes, for example, an angle counter that counts the number of clocks of the angle clock in synchronization with the angle clock generated by the clock generation unit 60, and a time counter that counts the number of clocks in synchronization with the operation clock of the timer dedicated processor 58. It has.

  The compare unit 56 compares the value set from the timer dedicated processor 58 with the angle counter and time counter of the counter unit 54 corresponding to the set value. When the set value matches the counter, the compare unit 56 outputs an output signal for the injection module and the ignition module to the output circuit 14 or the timer dedicated processor 58 matches the set value and the counter. Requests execution of processing corresponding to the event.

  When an execution event occurs, the timer dedicated processor 58 executes processing corresponding to the execution event in the order of occurrence based on a control program stored in a ROM (not shown).

  For example, the timer dedicated processor 58 sets the execution timing of engine control in the compare unit 56 at an angle timing or a time timing in response to a request from the main CPU 30. Further, each time the edge detection unit 52 detects the edge of the pulse of the crank signal, the timer dedicated processor 58 calculates the inter-edge time between the previously detected pulse and the currently detected pulse. Divide by the number of counts between edges set according to the angle interval.

  As described above, in this embodiment, the angular interval between the start pulse indicating the start of the missing tooth portion and the end pulse indicating the end of the missing tooth portion is three times the angular interval between the pulses in the pulse train. Therefore, the inter-edge count that divides the inter-edge time in the missing tooth portion is three times the inter-edge count that divides the inter-edge time in the pulse train.

The timer dedicated processor 58 divides the inter-edge time between the current time and the current time by the inter-edge count, and the angle clock generated by the clock generator 60 before the edge detector 52 detects the edge of the next pulse. The clock cycle.

  The clock generator 60 includes a target value counter (not shown). Each time the edge detection unit 52 detects the edge of the crank signal, the target value counter adds the count number between edges corresponding to the angular interval between pulses of the pulse train of the crank signal by hardware, and adds the target count to the target value counter. Set the number. Even if the edge detected by the edge detector 52 is a start pulse of a missing tooth portion, the target value counter adds the same inter-edge count.

  The inter-edge count is preset in the target value counter. In the present embodiment, for example, 4 is set as the count number between edges. The clock generation unit 60 generates the angle clock at the cycle calculated by the timer dedicated processor 58 until the count number of the angle counter reaches the target count number set in the target value counter.

  When the count number of the angle counter reaches the target value counter before the edge detection unit 52 detects the edge of the next pulse of the crank signal, the clock generation unit 60 stops generating the angle clock. In addition, the clock generator 60 is configured so that when the edge detection unit 52 detects the edge of the next pulse of the crank signal, the count of the angle counter does not reach the target count, the angle clock is set so as to reach the target count. Shorten the cycle.

[1-2. processing]
Various processes executed by the ECU 10 functioning as an engine control device will be described below.

(1) Edge Detection Processing When the edge detection unit 52 detects the edge of the crank signal, the edge detection unit 52 requests the timer dedicated processor 58 to execute the edge detection processing shown in the flowchart of FIG. The timer dedicated processor 58 executes edge detection processing in response to a request from the edge detection unit 52 unless other processing is being executed.

  In S400, the timer dedicated processor 58 calculates the time difference between the current edge detection time and the previous edge detection time as an inter-edge time between edges based on the following equation (1). When the current edge is the edge of the end pulse of the missing tooth portion, the inter-edge time calculated from the expression (1) is longer than that of the edge of the pulse other than the end pulse of the missing tooth portion.

Edge-to-edge time = current edge detection time−last edge detection time (1)
After the end of S400, the timer dedicated processor 58 stores the time when the edge detection unit 52 detects the current edge as the previous edge detection time.

  In S402, the timer dedicated processor 58 determines whether or not the missing tooth flag 1 is OFF. In the missing tooth determination process of FIG. 3 described later, the main CPU 30 sets the missing tooth flag 1 to ON when detecting the edge of the missing pulse at the start pulse, and turns off the missing tooth flag 1 when detecting an edge other than the start pulse. Set to.

  Between the edges, the edge detection process of FIG. 2 is executed before the missing tooth determination process of FIG. Therefore, in a state where the main CPU 30 detects the edge of the start pulse of the missing tooth portion and sets the missing tooth flag 1 to ON, the edge detecting portion 52 executes the edge detection processing of FIG. The requested trigger edge is the edge of the end pulse of the missing tooth portion.

  On the other hand, in a state where the main CPU 30 detects an edge other than the start pulse of the missing tooth portion and sets the missing tooth flag 1 to OFF, the edge detecting portion 52 performs the edge detection processing of FIG. The trigger edge requested to the processor 58 is an edge other than the end pulse of the missing tooth portion.

If the determination in S402 is Yes and the missing tooth flag 1 is OFF, the timer dedicated processor 58 calculates the period of the angle clock based on the following equation (2) in S404.
Angular clock period = time between edges / 4 (2)
The inter-edge time in equation (2) is the value calculated in S400. Further, since S404 is executed when the missing tooth flag 1 is OFF, the edge serving as a trigger for executing the edge detection processing of FIG. 2 this time is an edge other than the end pulse of the missing tooth portion.

  Therefore, the count number between edges at which the angle counter counts the number of pulses of the angle clock during the time between edges is 4 in this embodiment. Therefore, in the equation (2), the period of the angle clock can be calculated by dividing the inter-edge time by 4. After execution of S404, the process proceeds to S408.

When the determination in S402 is No and the missing tooth flag 1 is on, in S406, the timer dedicated processor 58 calculates the period of the angle clock based on the following equation (3).
Angular clock period = time between edges / 12 (3)
The inter-edge time in Equation (3) is the value calculated in S400. Further, since S406 is executed when the missing tooth flag 1 is on, the edge serving as a trigger for executing the edge detection processing of FIG. 2 this time is the edge of the end pulse of the missing tooth portion.

  Therefore, the inter-edge count number at which the angle counter counts the number of pulses of the angle clock during the inter-edge time is 12 = 4 × 3. Therefore, in the equation (3), the period of the angle clock can be calculated by dividing the inter-edge time by 12. After execution of S406, the process proceeds to S408.

  In S408, the timer processor 58 sets the cycle calculated in S404 or S406 as the cycle of the angle clock generated by the clock generation unit 60 between the pulse of the crank signal generated this time and the pulse of the crank signal generated next time. .

  Here, as shown in FIG. 6, when the edge detection unit 52 detects the edge of the pulse of the crank signal, the clock generation unit 60 adds and updates the count value between the edges of the pulse train to the target value counter 200 by hardware. To do. Thereby, the clock generation unit 60 generates an angle clock until the value of the target value counter 200 is reached. Then, the angle counter 210 counts the angle clock up to the target value counter 200.

  When the edge detection unit 52 detects the pal edge of the crank signal, the edge detection unit 52 requests the timer dedicated processor 58 to execute the edge detection processing 300. As will be described later, in the edge detection process 300, the timer dedicated processor 58 requests the main CPU 30 to execute the missing tooth determination process 302.

  As will be described later, in the missing tooth determination process 302, the main CPU 30 determines whether or not the edge detected by the edge detection unit 52 this time is the edge of the start pulse of the missing tooth part. If it is the edge of the start pulse of the missing tooth portion, the main CPU 30 requests the timer dedicated processor 58 to execute the missing tooth preliminary process 304.

  As will be described later, in the missing tooth pre-processing 304, the timer processor 58 updates the target value counter by adding a value twice the number of counts between edges of the pulse train to the target value counter. Accordingly, a value that is three times the number of counts between edges of the pulse train is set in the target value counter at the missing tooth portion. As a result, the angle clock is generated without interruption at the missing tooth portion.

  However, as shown in FIG. 7, when the edge detection unit 52 detects the edge and requests the timer dedicated processor 58 to execute the edge detection processing 310, the timer dedicated processor 58 is executing the other processing and the edge Execution of the detection process 310 may be delayed.

  In addition, when the execution of the missing tooth determination process 312 is requested in the edge detection process 310, the execution of the missing tooth determination process 312 may be delayed because the main CPU 30 is executing another process. Then, the execution of the missing tooth preliminary process 314 by the timer dedicated processor 58 requested by the main CPU 30 in the missing tooth determination process 312 is delayed. As a result, there may be a period in which the angle clock is not generated in the missing tooth portion.

  In particular, when the engine speed increases, the time interval of the missing tooth portion becomes shorter. In this case, if execution of the missing tooth determination process and the missing tooth preliminary process is delayed, a period during which no angle clock is generated is likely to occur in the missing tooth part.

  Therefore, as shown in FIG. 7, in the edge detection process 320 executed by detecting the edge of the pulse generated before the start pulse of the missing tooth portion, the abnormality determination time is calculated based on the following equation (4). calculate. The time calculated in S400 is used as the edge-to-edge time in Equation (4).

Abnormal judgment time = time between edges x 2 + maximum delay time (4)
As shown in FIG. 7, if the missing tooth preliminary process 314 is not executed during the abnormality determination time, it can be determined that the generation of the angle clock is stopped in the missing tooth portion. In this case, an abnormal event process 322 described later is executed.

  In equation (4), the time between edges is doubled because the time between edges from the edge of the pulse generated before the start pulse of the missing tooth part and the edge from the edge of the start pulse of the missing tooth part To add time. The maximum delay time is set to a maximum value at which the edge detection time is considered to be delayed due to engine deceleration.

  Here, in the edge detection processing 310 executed in the missing tooth portion, when the abnormality determination time calculated in the edge detection processing 320 is updated with the abnormality determination time calculated from the equation (4), the abnormality determination in FIG. Time shifts backwards.

  Therefore, the timer dedicated processor 58 determines whether or not the missing tooth flag 2 is ON in S410 so that the abnormality determination time is not calculated by the edge detection processing 310 executed in the missing tooth portion.

  The missing tooth flag 2 is set to ON when the main CPU 30 detects an edge before the start edge of the missing tooth portion in the missing tooth determination process described later. In the state where the main CPU 30 detects the edge before the start edge of the missing tooth portion and sets the missing tooth flag 2 to ON, the edge detecting portion 52 executes the edge detection processing of FIG. The requested trigger edge is the edge of the start pulse of the missing tooth portion.

Therefore, in the edge detection process executed when the missing tooth flag 2 is on, it is necessary to avoid calculation of the abnormality determination time. Therefore, if the determination in S410 is Yes and the missing tooth flag 2 is on, the timer-dedicated processor 58 does not execute S412 to S416, and proceeds to S418. When the determination in S410 is No and the missing tooth flag 2 is off, the timer dedicated processor 58 executes S412 to S416.

In S <b> 412, the timer dedicated processor 58 calculates an abnormality determination time for determining whether or not the generation of the angle clock is stopped at the missing tooth portion based on the equation (4).
In S414, the timer processor 58 calculates the abnormality determination time by adding the abnormality determination time calculated in S412 to the current edge detection time based on the following equation (5).

Abnormality determination time = current edge detection time + abnormality determination time (5)
In S416, the timer dedicated processor 58 sets the abnormality determination time in the compare unit 56. As will be described later, the compare unit 56 detects an abnormality with respect to an abnormality in which the generation of the angle clock is stopped at the missing tooth portion when the time counter corresponding to the counter unit 54 reaches the abnormality determination time set by the timer dedicated processor 58. The timer dedicated processor 58 is requested to execute the time process.

  In other words, when the elapsed time from the start pulse reaches the stop determination time for determining the stop of the angle clock in the missing part, the compare unit 56 requests the timer dedicated processor 58 to execute the abnormality process. In this case, the stop determination time is a time obtained by subtracting the edge-to-edge time from the abnormality determination time of Expression (4).

  It should be noted that when S412-S416 is executed when the edge of a pulse other than the start pulse of the missing tooth part and the pulse generated before the start pulse is detected, the expression (4) in the expression (5) The abnormality determination time is set by adding the calculated abnormality determination time to the current edge detection time. However, since it is considered that the time counter reaches the abnormality determination time is not between pulses other than the missing tooth portion, there is no problem even if S412 to S416 are executed.

In S418, the timer dedicated processor 58 requests the main CPU 30 to execute the missing tooth determination process.
(2) Missing tooth determination processing When the timer dedicated processor 58 requests execution of missing tooth determination processing, in S420 of FIG. 3, the missing tooth determination unit 32 of the main CPU 30 determines that the current edge counter value is 360 ° CA. It is determined whether or not it is the maximum value for counting the pulses of the crank signal.

  If the determination in S420 is No and the value of the edge counter is not the maximum value, the missing tooth determination unit 32 increments the edge counter by 1 in S422. If the determination in S420 is Yes and the edge counter is the maximum value, the missing tooth determination unit 32 sets the edge counter to 0 in S424.

When the missing tooth determination unit 32 executes S422 or S424, the edge counter is set to a value corresponding to the edge position of the crank signal detected by the edge detection unit 52 this time.
In S426, the missing tooth determination unit 32 determines whether or not the value of the edge counter corresponds to the edge of the start pulse of the missing tooth part.

  When the determination in S426 is Yes and the value of the edge counter corresponds to the edge of the start pulse of the missing tooth part, the missing tooth determination part 32 sets the missing tooth flag 1 to ON in S428. Further, in S430, the missing tooth determination unit 32 requests the timer dedicated processor 58 to execute the missing tooth preliminary process, and the process proceeds to S440.

  If the determination in S426 is No and the value of the edge counter does not correspond to the edge of the start pal of the missing tooth part, the missing tooth determination part 32 generates the edge counter value before the start pulse of the missing tooth part in S432 It is determined whether or not it corresponds to the edge of the pulse to be performed.

  If the determination in S432 is Yes and the value of the edge counter corresponds to the edge of the pulse generated before the start pulse of the missing tooth part, the missing tooth determination part 32 sets the missing tooth flag 2 to ON in S434. The process proceeds to S438.

  When the determination in S432 is No and the value of the edge counter does not correspond to the edge of the pulse generated before the start pulse of the missing tooth part, the missing tooth determination part 32 sets the missing tooth flag 2 to OFF in S436. The process proceeds to S438.

  In S438, the missing tooth determination unit 32 sets the missing tooth flag 1 to OFF. In S440, the main CPU 30 sets the execution timing of the angle synchronization event for executing the ignition control and executing the injection control in the compare unit 56. The compare unit 56 outputs an execution signal to the injection module and the ignition module at the execution timing of the angle synchronization event in which the corresponding angle counter is set.

(3) Missing tooth pre-processing When the main CPU 30 requests execution of the missing tooth pre-processing, the timer dedicated processor 58 determines whether or not the abnormality processing flag is on in S450 of FIG. When the time counter corresponding to the counter unit 54 reaches the abnormality determination time set in the compare unit 56 in the edge detection processing of FIG. 2, the abnormality processing flag is set to ON in the processing at the time of abnormality described in FIG. The

  When the abnormality processing flag is ON, it is indicated that, in the abnormality processing of FIG. 5, the timer dedicated processor 58 has executed setting of the target value counter in the missing tooth portion instead of the missing tooth preliminary processing of FIG. 4.

  Therefore, if the determination in S450 is Yes and the abnormal process flag is on, in S452, the timer dedicated processor 58 sets the abnormal process flag to off, and ends this process without executing other processes.

  4 is executed in the state where the abnormality processing flag is OFF, the fact that the main CPU 30 has executed the missing tooth determination process in FIG. Represents that. Therefore, in the missing tooth pre-processing shown in FIG. 4, the timer dedicated processor 58 needs to set the value of the target value counter that the angle counter reaches when the missing tooth end pulse is generated.

  Therefore, if the determination in S450 is No and the abnormality processing flag is off, the timer processor 58 clears the abnormality determination time set in the compare unit 56 in S454. As a result, the compare unit 56 does not compare the abnormality determination time with the corresponding time counter.

  In S456, based on the following equation (6), the timer dedicated processor 58 adds the remaining pulses to be added to the inter-edge count number of the pulse train set by the hardware in the target value counter of the clock generation unit 60 in the missing tooth start pulse. The missing tooth count which is the count is calculated. In equation (6), the count number between edges is the count number between edges of the pulse train, and the number of missing teeth is 2 in this embodiment.

Missing tooth count = Inter-edge count x Missing tooth number (6)
In S458, the timer processor 58 calculates the value of the target value counter that the angle counter reaches when the missing tooth end pulse is generated based on the following equation (7), and sets the target value counter.

Target value counter = target value counter + missing tooth count (7)
(4) Processing at the time of abnormality When the time counter of the counter unit 54 reaches the abnormality determination time set by the edge detection processing of FIG. 2, the timer dedicated processor 58 requests the execution of the abnormal event processing of FIG. Is done.

  In S460, the timer dedicated processor 58 clears the abnormality determination time set in the compare unit 56. Thereby, the compare unit 56 stops the comparison between the time counter and the abnormality determination time. Since S462 and S464 in FIG. 5 are the same processing as S456 and S458 in FIG.

  In S466, the timer dedicated processor 58 calculates the remaining time from when the time counter reaches the abnormality determination time until the edge detection unit 52 detects the edge of the end pulse of the missing tooth portion based on the following equation (8). . In the missing tooth part, (inter-edge time + maximum delay time) elapses from the edge detection time of the start pulse until the time counter reaches the abnormality determination time.

Remaining time = missing tooth time-(time between edges + maximum delay time)
= Edge time x 2-Maximum delay time (8)
The time between edges used in Expression (8) is the time between edges of the pulse train calculated by the latest edge detection processing. The missing tooth time is a time obtained by triple the latest time between edges. Therefore, the remaining time until the edge detection unit 52 detects the edge of the end pulse of the missing tooth portion is a time obtained by subtracting the maximum delay time from twice the inter-edge time.

In S468, the timer dedicated processor 58 calculates the period of the angle clock generated by the clock generator 60 based on the following expression (9) during the remaining time calculated by the expression (8).
Angular clock cycle = remaining time / missing tooth count (9)
In the missing tooth portion, when the edge detection unit 52 detects an edge, a clock of the number of counts between edges of the pulse train added to the target value counter by hardware is generated. Therefore, if the remaining time is divided by the missing tooth count calculated in S462, the period of the angle clock generated by the clock generation unit 60 with the remaining time can be calculated.

  Since the remaining time calculated by the equation (8) is shorter than the case where the abnormal time process is not executed at the missing tooth portion, the cycle calculated by the equation (9) is also shortened. Therefore, as shown in FIG. 7, the angle counter quickly counts up to the target count during the remaining time.

  In S470, the timer processor 58 sets the cycle calculated in S468 as the angle clock cycle. In S472, the timer processor 58 turns on the abnormality processing flag.

By setting the abnormality processing flag to ON, it is possible to prevent the target count number from being set again in the missing tooth preliminary processing in FIG.
[1-3. effect]
In the first embodiment described above, the following effects can be obtained.

  (1) The compare unit 56 detects that the generation of the angle clock at the missing tooth portion is stopped by hardware, and the compare unit 56 sends the value of the target value counter to the timer dedicated processor 58 and the remaining time of the missing tooth portion. The execution of the process at the time of abnormality that sets the cycle of the angle clock to be generated is requested.

  As a result, even if the execution of the missing tooth determination process by the software of the main CPU 30 and the execution of the missing tooth preliminary process by the software of the timer dedicated processor 58 required from the missing tooth determination process are delayed due to other software processes, The period during which the generation of the angle clock is stopped can be shortened as much as possible.

  As a result, as shown in FIG. 7, even if the ignition timing set by the value of the angle counter set by the main CPU 30 by the ignition control is delayed because the angle clock is not generated, the delay can be shortened as much as possible.

  (2) When it is detected that the generation of the angle clock is stopped at the missing tooth portion, the remaining time until the next pulse of the crank signal is generated is set to the remaining angle clock generated if normal. Divide by the number of clocks to calculate the period of the angle clock. Thus, when the next pulse of the crank signal is generated, an angle clock having a correct count number is generated.

  In the first embodiment described above, the missing tooth portion corresponds to the missing portion, the ECU 10 corresponds to the engine control device, the main CPU 30 corresponds to the missing determination device, and the missing tooth determination portion 32 corresponds to the missing determination portion. .

  The timer control module 50 corresponds to the clock generation device, the counter unit 54 corresponds to the angle counter, the timer dedicated processor 58 corresponds to the cycle calculation unit and the target setting unit, and the compare unit 56 corresponds to the stop determination unit. The clock generation unit 60 corresponds to the clock generation unit and the target setting unit.

  In the first embodiment, S400 to S408 and S466 to S470 correspond to the processing of the timer dedicated processor 58 as the period calculation unit, S420 to S438 correspond to the processing of the missing tooth determination unit 32, S456, S458, S462 and S464 correspond to the processing of the timer dedicated processor 58 as the target setting unit.

[2. Second Embodiment]
[2-1. Constitution]
Since the configuration of the ECU as the engine control device of the second embodiment is substantially the same as the configuration of the ECU 10 of the first embodiment, description thereof will be omitted.

[2-2. processing]
In the second embodiment, the point that the generation of the angle clock in the missing tooth portion is detected based on the elapsed time in which the target value counter and the angle counter coincide with each other without updating the target value counter. This is different from the first embodiment.

  In the second embodiment, in addition to the edge detection process and the abnormality determination process described below, the same missing tooth determination process and missing tooth preliminary process as in the first embodiment are executed. However, in the second embodiment, since the missing tooth flag 2 of the first embodiment is not used, S432 to S436 of the missing tooth determination process shown in FIG. 3 are omitted.

(1) Edge Detection Processing When detecting the edge of the crank signal pulse, the edge detection unit 52 requests the timer dedicated processor 58 to execute the edge detection processing shown in the flowchart of FIG. The timer dedicated processor 58 executes edge detection processing in response to a request from the edge detection unit 52 unless other processing is being executed.

Since S480 to S488 and S492 in FIG. 8 are substantially the same as S400 to S408 and S418 in FIG.
In S490, the timer dedicated processor 58 sets the target count number set in the target value counter by the hardware in the clock generation unit 60 in the compare unit 56 when the edge detection unit 52 detects the edge of the pulse of the crank signal. As a result, when the angle counter reaches the target count, the compare unit 56 requests the timer dedicated processor 58 to execute an abnormality determination process for measuring the time during which the generation of the angle clock is stopped.

(2) Abnormality determination processing When the angle counter matches the target count number, the timer dedicated processor 58 executes the abnormality determination processing in FIG. 9 in response to a hardware request from the compare unit 56. Reference numeral 330 in FIG. 10 corresponds to the abnormality determination process.

  In S500, the timer dedicated processor 58 determines whether or not the target value counter matches the angle counter. If the determination in S500 is No and the target value counter and the angle counter do not match, this process ends.

  If the determination in S500 is Yes and the target value counter and the angle counter match, the timer processor 58 in S502 matches the target value counter and the angle counter in order to measure the time for which the target value counter and the angle counter match. Add 1 to the time.

  In S504, the timer dedicated processor 58 determines whether or not the coincidence time in which the target value counter coincides with the angle counter is equal to or longer than the duration for determining the stop of the angle clock at the missing tooth portion. If the determination in S504 is No and the matching time is less than the duration, the process proceeds to S500. For example, the maximum delay time of the first embodiment is set as the duration time.

  Before the coincidence time becomes equal to or longer than the duration time, the missing tooth determination unit 32 executes the missing tooth determination process to determine that the current pulse is the start pulse of the missing tooth part, and the timer dedicated processor 58 performs the missing tooth preliminary process. Is executed, the missing tooth count is added to the target value counter and updated. Then, the determination in S500 becomes No, and the process ends without executing the processes in S506 to S516.

  If the determination in S504 is Yes and the match time is equal to or longer than the duration as shown in FIG. 10, the processes in S506 to S516 are executed. The processing of S506 to S516 is substantially the same as the processing of S462 to S472 in FIG.

[2-3. effect]
In the second embodiment described above, the same effects as the effects (1) and (2) of the first embodiment can be obtained. However, in the second embodiment, “request execution of abnormality process” in effect (1) of the first embodiment is read as “request execution of abnormality determination process”.

  In the second embodiment described above, S480 to S488 and S510 to S514 correspond to the processing of the timer dedicated processor 58 as the period calculation unit, and S500 to S504 correspond to the processing of the timer dedicated processor 58 as the stop determination unit. , S506, and S508 correspond to processing of the timer dedicated processor 58 as the target setting unit.

  In the second embodiment, when the angle counter matches the target count, the timer dedicated processor 58 executes the abnormality determination process of FIG. 9 in response to a hardware request from the compare unit 56. Therefore, the compare unit 56 also corresponds to the stop determination unit.

[3. Other Embodiments]
(1) In the above embodiment, the multiplication number for dividing the period between pulses of the clock signal is set to 4 between the pulses of the reference pulse train. As a matter of course, the multiplication number is not limited to 4, and is appropriately set according to the size of the angle interval between pulses of the pulse train and the required resolution of the angle clock.

  (2) A plurality of functions of one constituent element in the above embodiment may be realized by a plurality of constituent elements, or a single function of one constituent element may be realized by a plurality of constituent elements. In addition, a plurality of functions possessed by a plurality of constituent elements may be realized by one constituent element, or a single function realized by a plurality of constituent elements may be realized by one constituent element. Moreover, you may abbreviate | omit a part of structure of the said embodiment. In addition, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of the other embodiment. In addition, all the aspects included in the technical idea specified only by the wording described in the claims are embodiments of the present invention.

  (3) In addition to the engine control device 10 described above, an engine control system including the engine control device 10 as a constituent element, an engine control program for causing a computer to function as the engine control device 10, and a record recording the engine control program The present invention can also be realized in various forms such as a medium and an engine control method.

10: ECU (engine control device), 20: microcomputer, 30: main CPU (missing determination device), 32: missing tooth determination unit (missing determination unit), 50: timer control module (clock generation device), 54: counter unit (Clock counter), 56 competition section (stop determination section), 58: timer dedicated processor (cycle calculation section, target value setting section, stop determination section), 60: clock generation section

Claims (6)

In the engine control device (10) including the missing determination device (30) and the clock generation device (50),
The missing determination device includes:
In a crank signal having a pulse train having a pulse generated every time the crankshaft of the engine rotates by a certain angle, and a missing portion in which the pulse is missing and the angular interval between the pulse and the pulse is larger than the pulse train. A missing determination unit (32, S420 to S438) configured to determine by software whether the pulse generated this time is a start pulse indicating the start of the missing unit;
The clock generation device includes:
Each time the pulse is generated, a value obtained by dividing the pulse period between the pulse generated this time and the pulse generated last time by a multiplication number set in advance according to the angular interval between the pulse and the pulse is generated by software. A period calculation unit (58, S400 to S408, S480 to S488) configured to calculate the clock period of the angle clock;
An angle counter (54) for counting the number of clocks of the angle clock;
A clock generator (60) configured to generate the angle clock at the clock cycle calculated by the cycle calculator until the angle counter reaches a target count number set every time the pulse is generated; ,
A stop determination unit (56, 58, S500) configured to determine whether the generation of the angle clock by the clock generation unit in the missing part is stopped by at least hardware of hardware and software. To S504),
When the missing determination unit determines that the pulse generated this time is the start pulse, the target count number reached by the angle counter when the end pulse indicating the end of the missing portion is generated is set by software. A configured target setting unit (58, S456, S458);
With
When the missing determination unit does not determine that the pulse generated this time is the start pulse, and the stop determination unit determines that the generation of the angle clock is stopped in the missing unit, the target setting The units (S462, S464, S506, S508) are configured to set, by software, the target count number reached by the angle counter when the end pulse is generated, and the period calculation units (S466-S470, S510). S514) is configured to calculate the clock period of the angle clock generated by the clock generation unit until the end pulse is generated.
Engine control device. The engine control device according to claim 1,
The clock generation unit adds the number of clocks of the angle clock generated by the clock generation unit at the angular interval between the pulses of the pulse train to the target count number by hardware each time the pulse is generated. And
When the missing determination unit determines that the currently generated pulse is the start pulse, the target setting unit (S456, S458) determines the interval between the pulses in the pulse train from the angular interval between the end pulse and the start pulse. The target count reached by the angle counter when the end pulse is generated by adding the number of clocks of the angle clock generated by the clock generation unit to the target count number by software at an angular interval obtained by subtracting the angular interval. Set the number,
Engine control device. The engine control device according to claim 1 or 2,
When the period calculation unit calculates the clock period every time the pulse occurs, the missing determination unit determines whether the pulse generated this time is the start pulse.
Engine control device. In the engine control device according to any one of claims 1 to 3,
The stop determination unit determines that the elapsed time from the start pulse in the missing part is the stop of the angle clock in a state where the missing determination unit has not determined that the pulse generated this time is the start pulse. Determining that the generation of the angle clock is stopped at the missing portion when the stop determination time for reaching is reached,
Engine control device. In the engine control device according to any one of claims 1 to 3,
The stop determination unit (S500 to S504), when the coincidence time in which the angle counter matches the target count number in the missing part is equal to or longer than the duration for judging the stop of the angle clock, It is determined that the generation of the angle clock has stopped.
Engine control device. The engine control device according to claim 4 or 5,
The period calculation unit calculates the remaining time from the timing at which the stop determination unit determines that the generation of the angle clock is stopped at the missing unit to the timing at which the end pulse is generated, as the target count in the end pulse. A value divided by the number of clocks of the angle clock generated by the clock generator during the remaining time in order for the angle counter to reach a number is calculated as the clock period;
Engine control device.

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