JP2016160876A - Control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a variation of an A/D conversion cycle of a sensor signal in a signal processor, in a control system to which the signal processor and an electronic control device are connected via a communication line.SOLUTION: An ECU 11 comprises an oscillator 26, and a microcomputer 25 which is operated by a clock created by a clock creation part 27. A signal processor 30 comprises A/D conversion means which makes an A/D converter perform the A/D conversion of a sensor signal outputted by a fuel pressure sensor PS at a prescribed A/D conversion cycle, and an oscillator 32 and a clock creation part 34 which create clocks. The microcomputer 25 performs processing for controlling injectors 1 to 4 by using data of an A/D conversion result of the sensor signal which is transmitted from the signal processor 30. Furthermore, the system 10 comprises means for correcting the A/D conversion cycle which is measured by the A/D conversion means by using a clock at the signal processor 30 side to a set value on a layout with a cycle of a clock at the ECU side as true.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a control system in which a signal processing device for A / D converting a sensor signal and an electronic control device are connected via a communication line.

  There is a control system in which a signal processing device that performs A / D conversion of a sensor signal every predetermined time by an A / D converter and an electronic control device that controls a control target are connected via a communication line. In this type of control system, the signal processing device transmits data representing the A / D conversion result of the sensor signal at regular intervals to the electronic control device. And the information processing part which consists of a microcomputer etc. of an electronic control apparatus performs the process for controlling a control object using the data received from the signal processing apparatus (for example, refer patent document 1).

JP 2012-127209 A

  In the signal processing device, the A / D conversion cycle of the sensor signal is measured using a clock generated by the signal processing device. For this reason, if the cycle of the clock generated by the signal processing device varies, the A / D conversion cycle also varies from a design set value (so-called typical value). And the dispersion | variation in the A / D conversion period of a sensor signal will cause the fall of the control precision of a control object.

  Accordingly, an object of the present invention is to suppress variations in A / D conversion periods of sensor signals in a signal processing device in a control system in which the signal processing device and the electronic control device are connected via a communication line. .

The control system of the first invention includes a signal processing device and an electronic control device that are communicably connected via a communication line.
The electronic control device includes a control device-side clock generation unit that generates a clock with a fixed period, and an information processing unit that operates according to the control device-side clock that is a clock generated by the control device-side clock generation unit.

  In addition, the signal processing device includes an A / D converter for A / D converting the sensor signal output from the sensor, and A / D conversion of the sensor signal to the A / D converter at a predetermined A / D conversion cycle. A / D conversion control means to be implemented, and signal processing apparatus side clock generation means for generating a signal processing apparatus side clock that is a clock used by the A / D conversion control means to measure the A / D conversion cycle. .

  In this control system, the signal processing device transmits data representing the A / D conversion result of the sensor signal by the A / D converter to the electronic control device, and the information processing means of the electronic control device performs the signal processing. A process for controlling the control target is performed using data from the apparatus.

Furthermore, this control system is provided with period correction means. The period correction means is an A / D that is measured by the A / D conversion control means in the signal processing device using the signal processing device side clock
The conversion cycle is corrected to the set cycle with the cycle of the control device side clock as true. “Assuming that the cycle of the control device side clock is true” means that “the cycle of the control device side clock is correct”. The set period is a set value on the design of the A / D conversion period, in other words, a median value (so-called typical value) of the A / D conversion period set on the design.

  According to this control system, the A / D conversion cycle of the sensor signal in the signal processing device can be corrected to the set cycle with the cycle of the control device side clock as true. Generally, the accuracy of the cycle of the clock (control device side clock) generated for operating the information processing means in the electronic control device is more accurate than the accuracy of the cycle of the clock (signal processing device side clock) generated in the signal processing device. Is also set high. For this reason, the A / D conversion cycle of the sensor signal in the signal processing device can be corrected to the set cycle based on the cycle of the highly accurate control device side clock. Therefore, variation in the A / D conversion cycle of the sensor signal in the signal processing device can be suppressed, and as a result, the control accuracy of the controlled object can be improved.

  In addition, when there are a plurality of signal processing devices, the A / D conversion periods of the signal processing devices can be matched. For this reason, it is possible to prevent a decrease in control accuracy due to a difference in A / D conversion cycle in each signal processing device. In this case, the accuracy of the cycle of the control device side clock may be equal to the accuracy of the cycle of the signal processing device side clock.

  In addition, the code | symbol in the parenthesis described in the claim shows the correspondence with the specific means as described in embodiment mentioned later as one aspect, Comprising: The technical scope of this invention is limited is not.

It is a block diagram showing the fuel-injection control system of 1st Embodiment. It is a block diagram showing the connection state of an injector and ECU, and the structure of an injector. It is a block diagram showing the structure of control IC. It is a 1st graph for demonstrating the influence by the A / D conversion period varying. It is a 2nd graph for demonstrating the influence by the A / D conversion period varying. It is a 3rd graph for demonstrating the influence by the A / D conversion period varying. It is the graph which expanded a part of FIG. It is a flowchart showing the response process of 1st Embodiment. It is a flowchart showing the correction control process of 1st Embodiment. It is a flowchart showing the interruption process of 1st Embodiment. It is a time chart for demonstrating the effect | action of 1st Embodiment. It is a graph for demonstrating the effect of 1st Embodiment. It is a flowchart showing the correction instruction | indication process of 2nd Embodiment. It is a flowchart showing the correction process of 2nd Embodiment.

  The fuel injection control system of the embodiment to which the present invention is applied will be described below. In addition, the fuel injection control system of this embodiment controls the fuel injection to the diesel engine of a motor vehicle.

[First Embodiment]
As shown in FIG. 1, a fuel injection control system 10 of this embodiment includes injectors 1 to 4 as fuel injection valves provided in each cylinder (four cylinders in this embodiment) # 1 to # 4 of an engine 13. And an electronic control unit (hereinafter referred to as ECU) 11 that controls fuel injection to the engine 13 by controlling the injectors 1 to 4. ECU is "Electronic
Abbreviation for “Control Unit”.

  The injectors 1 to 4 are of a solenoid valve type that opens by energizing the coil (opens the injection port). Further, the fuel injection order of each cylinder # 1 to # 4 is, for example, “# 1 → # 4 → # 3 → # 2”. The injectors 1 to 4 may be of a type that opens and closes with a piezo actuator.

  Each of the injectors 1 to 4 is connected to a fuel supply pipe 17 extending from a common rail 15 that is a fuel pressure storage container. The fuel stored in the fuel tank 19 of the vehicle is pumped to the common rail 15 by a fuel pump 21. The fuel pump 21 is, for example, an engine-driven high-pressure pump that is driven by the rotation of the crankshaft of the engine 13 to perform a pump operation.

  The injectors 1 to 4 are opened when high-pressure fuel stored in the common rail 15 is supplied via the fuel supply pipe 17 and is driven by the ECU 11 (the coil is energized). Then, the fuel is injected into cylinders # 1 to # 4 from its injection port (not shown).

  In the fuel supply piping 17 from the common rail 15 to each of the injectors 1 to 4, the end of the injectors 1 to 4 (that is, the fuel intake port of the injectors 1 to 4) has a fuel pressure at that position (so-called inlet pressure). A fuel pressure sensor PS for detecting the above is provided. For this reason, the fuel pressure detected by a fuel pressure sensor (hereinafter simply referred to as a sensor) PS varies depending on the fuel injection operation of the injectors 1 to 4 corresponding to the sensor PS.

  The sensor PS outputs a voltage corresponding to the fuel pressure as a sensor signal. The sensor PS is provided in each of the injectors 1 to 4 and is a constituent element of each of the injectors 1 to 4. In the following description, the fuel pressure is the fuel pressure detected by the sensor PS unless otherwise specified, and is the fuel pressure at the fuel intake ports of the injectors 1 to 4.

  Each of the injectors 1 to 4 is capable of data communication (serial communication in the present embodiment) with the ECU 11 via a common communication line LC (see also FIG. 2). Pressure value data representing the fuel pressure detected by the sensor PS is transmitted from each of the injectors 1 to 4 to the ECU 11 via the communication line LC.

  Further, the ECU 11 also receives signals from other sensors for detecting the operating state of the engine 13. Other sensors include, for example, the well-known crank angle sensor 23, an intake air sensor that detects the amount of intake air to the engine 13, a water temperature sensor that detects the cooling water temperature of the engine 13, an accelerator depression sensor, There are fuel ratio sensors.

  On the other hand, the ECU 11 includes a microcomputer (hereinafter referred to as a microcomputer) 25 that performs fuel injection control processing for injecting fuel into the injectors 1 to 4, a communication driver 29 for communicating with the injectors 1 to 4, and a fixed period (in other words, An oscillator 26 for generating a clock having a constant frequency).

The oscillator 26 is made of, for example, crystal. The microcomputer 25 includes a clock generation unit 27 that constitutes an oscillation circuit together with the oscillator 26. In the ECU 11, the clock generated by the clock generation unit 27 corresponds to a control device side clock, and is used as an operation clock for operating the microcomputer 25 and also as an operation clock for the communication driver 29. Hereinafter, the clock generated by the clock generation unit 27 is referred to as an ECU clock, and the cycle of the ECU clock is referred to as an ECU clock cycle.

  The microcomputer 25 also includes a well-known CPU, ROM, RAM, free run counter, and the like (not shown). The free-run counter is a counter that is counted up by the ECU clock. Although not shown, the ECU 11 sends a drive signal for opening the valve to each of the injectors 1 to 4 in accordance with the injection command signal for each of the injectors 1 to 4 output from the microcomputer 25 (in the present embodiment, the injectors). A drive circuit is also provided for outputting currents to the coils 1-4. As shown in FIG. 1, drive signal lines LD <b> 1 to LD <b> 4 for outputting drive signals from the ECU 11 to the injectors 1 to 4 are arranged between the ECU 11 and the injectors 1 to 4.

Next, the structure of each injector 1-4 is demonstrated using FIG.
As shown in FIG. 2, a common power line LP and ground line LG are disposed between the injectors 1 to 4 and the ECU 11 in addition to the communication line LC and the drive signal lines LD1 to LD4 described above. .

  The power supply line LP is a line that supplies a constant power supply voltage from the ECU 11 to each of the injectors 1 to 4, and the ground line LG is a line that connects the ground line in the ECU 11 and the ground lines in the injectors 1 to 4. It is. In the fuel injection control system 10, when an ignition switch corresponding to a vehicle power switch is turned on, a battery voltage as an operation power supply is supplied to the ECU 11, the microcomputer 25 is activated, and the power line LP and the ground line LG are connected. Thus, electric power is supplied from the ECU 11 to each of the injectors 1 to 4.

Each of the injectors 1 to 4 is provided with a signal processing device 30 for processing a sensor signal from the sensor PS.
The signal processing device 30 includes a control IC 31 that is a main body of the signal processing device 30 and an oscillator 32 for generating a clock having a fixed period.

  The oscillator 32 is made of, for example, crystal. The control IC 31 includes a communication driver 33 for communicating with the ECU 11 via the communication line LC and a clock generation unit 34. The clock generator 34 forms an oscillation circuit together with the oscillator 32. In the injectors 1 to 4, the clock generated by the clock generation unit 34 corresponds to the signal processing device side clock and is used as an operation clock for operating the control IC 31. Hereinafter, the clock generated by the clock generation unit 34 is referred to as an INJ clock, and the period of the INJ clock is referred to as an INJ clock period. “INJ” means an injector.

The control IC 31 and the sensor PS operate with electric power supplied from the ECU 11 via the power supply line LP and the ground line LG.
Next, the configuration of the control IC 31 provided in the injectors 1 to 4 will be described with reference to FIG. 3 shows the configuration of the injector 1, the other injectors 2 to 4 have the same configuration as shown in () in FIG. 3.

As shown in FIG. 3, the control IC 31 includes an A / D converter 41 for A / D converting a sensor signal from the sensor PS, a memory 42, a cycle, in addition to the communication driver 33 and the clock generation unit 34. A counter 43, a cycle storage unit 44, a correction value storage unit 45, an addition circuit 46, and a comparison circuit 47 are provided. Although not shown, the control IC 31 also includes a processing unit that controls the operation of the control IC 31. The processing unit also operates with the INJ clock.

The memory 42 is a RAM, for example.
The period counter 43 receives the INJ clock from the clock generation unit 34 in order to measure the A / D conversion period of the sensor signal (specifically, the period at which the A / D converter 41 performs the A / D conversion of the sensor signal). It is a counter that counts. The period counter 43 is cleared every time A / D conversion of the sensor signal by the A / D converter 41 is completed. Hereinafter, the A / D conversion cycle of the sensor signal is referred to as an ADC cycle. “ADC” means A / D conversion.

  The cycle storage unit 44 stores in advance a basic count number corresponding to a set cycle (hereinafter referred to as a set ADC cycle) that is a set value for design of the ADC cycle. The design set value is a median value set by design, which is a so-called typical value. If the design setting value of the INJ clock cycle is referred to as the setting INJ clock cycle, the basic count number is a value obtained by dividing the setting ADC cycle by the setting INJ clock cycle.

  The correction value storage unit 45 is a rewritable memory. In the correction value storage unit 45, an ADC cycle correction value that is a correction value for correcting the ADC cycle is written. The ADC cycle correction value is a value that increases or decreases the number counted by the cycle counter 43 from the basic count number. The initial value of the ADC cycle correction value stored in the correction value storage unit 45 is 0. When the ADC cycle correction value is transmitted from the ECU 11 to the injectors 1 to 4, the control IC 31 receives the ADC from the ECU 11. The period correction value is updated and written in the correction value storage unit 45 (that is, overwritten).

The adder circuit 46 adds the basic count number stored in the cycle storage unit 44 and the ADC cycle correction value stored in the correction value storage unit 45, and outputs the addition result.
The comparison circuit 47 compares the count value of the cycle counter 43 with the output value of the adder circuit 46, and when the count value of the cycle counter 43 matches the output value of the adder circuit 46, the A / D converter 41 is compared. The ADC trigger commanding the execution of A / D conversion is output.

  Each time the A / D converter 41 receives an ADC trigger from the comparison circuit 47, the A / D converter 41 performs A / D conversion of the sensor signal. In the control IC 31, each time the A / D conversion of the sensor signal by the A / D converter 41 is completed, the pressure value data that is the data of the A / D conversion result is transferred to the memory 42 and the period counter 43. Is cleared.

  For this reason, in each of the injectors 1 to 4 (specifically, in the control IC 31 constituting the signal processing device 30), the sensor signal A / D conversion is performed, and pressure value data, which is data of the A / D conversion result, is stored in the memory 42. That is, the time of “(basic count number + ADC cycle correction value) × INJ clock cycle” is the ADC cycle.

  Then, the time-series pressure value data stored in the memory 42 for each ADC cycle is transmitted to the ECU 11 by the communication driver 33 via the communication line LC. For example, the pressure value data is collectively transmitted to the ECU 11 by a predetermined number.

Further, the communication driver 33 is provided with a pulse generation counter 48.
The pulse generation counter 48 is a counter that counts the INJ clock in order to output a pulse having a pulse width longer than the INJ clock cycle and the ADC cycle (in this example, a high pulse) to the communication line LC.

  When the count by the pulse generation counter 48 starts from 0, the control IC 31 causes the communication driver 33 to change the output signal as a pulse to the communication line LC from low to high. Then, when the INJ clock is counted by a predetermined number Np1 by the pulse generation counter 48 (that is, when the count value of the pulse generation counter 48 reaches the predetermined number Np1), the control IC 31 causes the communication driver LC to transmit the communication line LC. Return the output signal to high to low. Therefore, the pulse width (high time in this example) of the pulse output from the control IC 31 to the communication line LC using the pulse generation counter 48 is “INJ clock period × predetermined number Np1”. This pulse is a pulse used to correct the ADC cycle (hereinafter also referred to as a correction pulse). The pulse generation counter 48 may be provided outside the communication driver 33.

  On the other hand, in order to control the injectors 1 to 4 of the cylinders # 1 to # 4, the microcomputer 25 of the ECU 11 performs, for example, the following <1> to <4> for each of the injectors 1 to 4. In the following description, “n” and “m” used as the codes of the injector and “n” and “m” at the end of the codes such as #n and #m are any one of 1-4.

  << 1 >> A target injection state (for example, injection start timing and injection amount) of the injector n is calculated based on control parameters such as the engine speed and the accelerator opening. And the basic value of the output start timing of the injection command signal with respect to the injector n required in order to implement | achieve the target injection state and output continuation time is calculated.

  << 2 >> Among the pressure value data received from the injector n, from a plurality of time-series pressure value data in a specific injection state monitoring period including the driving period of the injector n (fuel injection period of the cylinder #n), The fluctuation state of the fuel pressure accompanying the fuel injection is detected. Based on the detection result, the injection state such as the actual injection start timing and the injection amount is analyzed, and the correction value for correcting the output start timing and output duration of the injection command signal is calculated from the analysis result. To do.

  << 3 >> The basic value of the output start timing and output duration time of the injection command signal calculated in the process of <1> is corrected by the correction value calculated in the process of <2>, and the output of the injection command signal is started. The timing and output duration are finally determined.

<< 4 >> The injection command signal for the injector n is output as the result determined in the process of <3> above.
Further, the microcomputer 25 of the ECU 11 receives from the injector m of the cylinder #m different from the injector n in order to detect the fluctuation state of the fuel pressure accompanying the fuel injection of the injector n in the processing of << 2 >>. Of the pressure value data, pressure value data at the same timing as the pressure value data from the injector n is also used.

  Disturbance components such as pressure fluctuations accompanying the fuel pump 21 fuel pressure are equally superimposed on the sensor signals output from the sensors PS of the injectors 1 to 4. In order to accurately detect the fluctuation state of the fuel pressure accompanying the fuel injection of the injector n, it is necessary to exclude the disturbance component from the pressure value data received from the injector n. For this reason, the microcomputer 25 is the same as the pressure value data from the injector n out of the pressure value data from the other injectors m not performing the fuel injection from the pressure value data from the injector n performing the fuel injection. A value obtained by subtracting the pressure value data at the timing is calculated as a difference. And based on the difference, the fluctuation state of the fuel pressure due to the injection operation of the injector n is detected. By doing so, for each of the injectors 1 to 4, the detection accuracy of the fuel pressure fluctuation at the time of injection is improved, and as a result, the control accuracy of fuel injection is improved.

  However, in each of the injectors 1 to 4, since the ADC cycle is measured using the INJ clock, if the INJ clock cycle varies from the set INJ clock cycle, the ADC cycle also varies from the set ADC cycle.

  For example, FIG. 4 shows the waveform (transition) of the pressure value data from the injector 1 of the front cylinder (in this example, # 1) that is the cylinder on which fuel injection has been performed. In FIG. 4, a dotted line waveform is a waveform when there is no error in the ADC cycle (that is, when the ADC cycle is a set ADC cycle), and is a true value waveform, and a solid line waveform is an ADC with a set ADC cycle. The waveform is shown when it is 1% longer than the period. If the set ADC cycle is 10 μs, the solid line waveform is a waveform when the ADC cycle is 10.1 μs. The solid line waveform is a waveform that is reduced by 1% in the time axis direction with respect to the true dotted line waveform.

  Further, for example, FIG. 5 shows a waveform of pressure value data from the injector 3 of the back cylinder (# 3 in this example), which is a cylinder not performing fuel injection. In FIG. 5, a dotted line waveform is a waveform when there is no ADC cycle error (true value waveform), and a solid line waveform is a waveform when the ADC cycle is 1% shorter than the set ADC cycle. Yes. If the set ADC cycle is 10 μs, the solid line waveform is a waveform when the ADC cycle is 9.9 μs. The solid line waveform is a waveform that is enlarged by 1% in the time axis direction with respect to the true dotted line waveform.

  6 is a waveform obtained by subtracting the solid line waveform in FIG. 5 from the solid line waveform in FIG. 4. The dotted line waveform in FIG. 6 is obtained by subtracting the dotted line waveform in FIG. 5 from the dotted line waveform in FIG. It is a waveform. Further, the waveform in FIG. 7 is an enlarged view of the initial portion of the waveform in FIG.

  As shown in FIGS. 6 and 7, when the ADC cycle varies between the injectors 1 and 3 of the front cylinder (# 1) and the back cylinder (# 3), the fluctuation state of the fuel pressure accompanying the fuel injection of the injector 1 is detected. Therefore, the solid line waveform is different from the true dotted line waveform. Then, errors that occur in the analysis results such as the actual injection start timing and the injection amount of the injector 1 increase, and as a result, the control accuracy of the injector 1 (in other words, the control accuracy of fuel injection) decreases. And this is the same also about the other injectors 2-4.

  Therefore, in the fuel injection control system 10 of the present embodiment, variations in the ADC cycle among the injectors 1 to 4 are automatically suppressed. In the following, processing that is performed to suppress variation in the ADC cycle will be described.

When the control IC 31 of each of the injectors 1 to 4 receives a pulse output instruction (described later) transmitted from the ECU 11 to the injector provided with the injector, the control IC 31 performs a response process shown in FIG.
As shown in FIG. 8, when the control IC 31 starts response processing, first, in S110, the pulse for correction is output to the communication line LC using the pulse generation counter 48. Then, the control IC 31 waits until receiving the ADC cycle correction value transmitted from the ECU 11 in the next S120, and when receiving the ADC cycle correction value (S120: YES), the process proceeds to S130. In S130, the ADC cycle correction value received from the ECU 11 is stored in the correction value storage unit 45, and then the response process is terminated.

  On the other hand, for example, when the ignition switch is turned on and started, the microcomputer 25 of the ECU 11 performs the correction control process of FIG. Note that the processing performed by the microcomputer 25 is realized by the CPU in the microcomputer 25 executing a program in the ROM.

As shown in FIG. 9, when starting the correction control process, the microcomputer 25 sets the value of the loop counter C to 1 in S210. The value of the loop counter C is a parameter indicating one of the injectors 1 to 4. For example, when the value of the loop counter C is 1 (C = 1), “injector (C)” It means the injector 1.

  In step S220, the microcomputer 25 transmits a pulse output instruction to the injector (C). The pulse output instruction is command data composed of a specific data string, and is output to the communication line LC with a destination ID indicating the destination injectors 1 to 4 (also the destination signal processing device 30 or the control IC 31). . Specifically, in S220, the microcomputer 25 outputs a pulse output instruction with a destination ID indicating the injector (C) to the communication line LC.

  The pulse output instruction from the ECU 11 is received by the control IC 31 of each of the injectors 1 to 4, and the control IC 31 of each of the injectors 1 to 4 is a pulse output instruction addressed to itself by the destination ID attached to the pulse output instruction. If it is a pulse output instruction addressed to itself, the response process of FIG. 8 is performed. For this reason, when the microcomputer 25 transmits a pulse output instruction to the injector (C), the control IC 31 of the injector (C) performs the response process of FIG. 8 and outputs the aforementioned correction pulse to the communication line LC. It will be.

  In step S230, the microcomputer 25 determines whether or not the pulse received flag (C) is turned on, and waits until the pulse received flag (C) is turned on. The pulse received flag is provided corresponding to each of the injectors 1 to 4, and the pulse received flag (C) means a pulse received flag provided for the injector (C). In addition, the microcomputer 25 turns off all the pulses received flags by the initialization process that is performed after the activation until the correction control process is started. The pulse received flag (C) is turned on in S390 in FIG.

  On the other hand, the microcomputer 25 transmits a pulse output command to the injector (C) in S220 and determines that the pulse received flag (C) is turned on in S230. Every time an edge occurs, the interrupt process shown in FIG. 10 is performed. In that period, an edge generated in the communication line LC is an edge of a correction pulse output to the communication line LC by the control IC 31 of the injector (C).

  As shown in FIG. 10, when starting the interrupt process, the microcomputer 25 determines in S310 whether or not the edge generated this time is a rising edge, and if it is a rising edge, the microcomputer 25 proceeds to S320. In S320, the microcomputer 25 stores the free-run time when the rising edge occurs in the communication line LC as the pulse rising time, and then ends the interrupt processing. The free run time is a value of a free run counter in the microcomputer 25.

  If the microcomputer 25 determines in S310 that the current edge is not a rising edge (that is, a falling edge), the microcomputer 25 proceeds to S330. In S330, the microcomputer 25 stores the free-run time when the falling edge occurs in the communication line LC as the pulse falling time.

  In the next S340, the microcomputer 25 multiplies the value obtained by subtracting the pulse rise time stored in S320 from the pulse fall time stored in S330 by the set ECU clock cycle, which is a design setting value of the ECU clock cycle. The calculated time is calculated as the actual pulse width. The actual pulse width is a measurement result obtained by measuring the pulse width of the correction pulse output from the control IC 31 of the injector (C) using the ECU clock. Further, since the free-run counter is counted up by the ECU clock, the measurement resolution of the actual pulse width is one cycle of the ECU clock.

  Then, in the next S350, the microcomputer 25 substitutes the actual pulse width calculated in S340 into the following equation 1 to calculate the actual INJ clock cycle, which is the actual INJ clock cycle.

Actual INJ clock cycle = (actual pulse width ÷ set pulse width) × set INJ clock cycle ... Formula 1
The set pulse width is a design set value of the pulse width of the correction pulse, and is a time obtained by multiplying the set INJ clock cycle by the predetermined number Np1. This set pulse width corresponds to a set time interval. The actual INJ clock cycle calculated in S350 is the actual INJ clock cycle in the control IC 31 of the injector (C).

In the next S360, the microcomputer 25 calculates the necessary count number by substituting the actual INJ clock cycle calculated in S350 into the following Equation 2.
The necessary count number is the count number of the INJ clock that the cycle counter 43 must count in order to make the actual ADC cycle the set ADC cycle in the control IC 31 of the injector (C).

Necessary count = set ADC cycle / actual INJ clock cycle ... Formula 2
In step S370, the microcomputer 25 calculates the ADC cycle correction value by substituting the necessary count number calculated in step S360 into the following equation 3.

ADC cycle correction value = required count number−basic count number—equation 3
In step S380, the microcomputer 25 transmits the ADC cycle correction value calculated in step S370 to the injector (C). Then, the control IC 31 of the injector (C) determines that the ADC cycle correction value from the ECU 11 has been received in S120 in the response process of FIG. 8, and the received ADC cycle correction value is stored in the correction value storage unit 45. This is stored (S130). In the control IC 31 of the injector (C), the ADC cycle correction value from the ECU 11 is stored in the correction value storage unit 45, whereby the output value of the adder circuit 46 (that is, the count of the INJ clock counted by the cycle counter 43) is stored. Number) is equal to the necessary count calculated in S360. This is because the basic count is stored in the cycle storage unit 44 in advance.

  At the time when the microcomputer 25 transmits the ADC cycle correction value in S380, only the injector (C) designated by the pulse output instruction among the injectors 1 to 4 is waiting to receive the ADC cycle correction value. It is. For this reason, the ADC cycle correction value transmitted from the ECU 11 may not have a destination ID, but of course, a destination ID may be added to clarify the destination.

In step S390, the microcomputer 25 turns on the pulse received flag (C), and then ends the interrupt processing.
Returning to the description of FIG. When the pulse received flag (C) is turned on in S390 of FIG. 10, the microcomputer 25 determines that the pulse received flag (C) is turned on in S230 of FIG. 9, and proceeds to S240. In step S240, the microcomputer 25 increments the value of the loop counter C by 1 (+1).

  In the next S250, the microcomputer 25 determines whether or not the value of the loop counter C is larger than the number of cylinders (4 in this example), and if the value of the loop counter C is equal to or less than the number of cylinders (S250: NO), it returns to S220.

If the microcomputer 25 determines in S250 that the value of the loop counter C is greater than the number of cylinders, the microcomputer 25 proceeds to S260, transmits ADC start instructions to all of the injectors 1 to 4, and then performs the correction control. The process ends.

  On the other hand, when the control IC 31 of each of the injectors 1 to 4 receives the ADC start instruction transmitted from the ECU 11, the control counter 31 clears the period counter 43 and starts the count operation, thereby performing A / D conversion for each predetermined time of the sensor signal. To start. Then, the control IC 31 of each of the injectors 1 to 4 creates transmission data by collecting a predetermined number of pressure value data for each ADC cycle stored in the memory 42 after receiving the ADC start instruction, and transmits the transmission data. A frame with a transmission source ID indicating the transmission source is transmitted to the ECU 11. For this reason, the microcomputer 25 of the ECU 11 can determine the transmission source of the received frame (pressure value data) from the transmission source ID.

  In the fuel injection control system 10 of the present embodiment, the microcomputer 25 of the ECU 11 transmits a pulse output instruction to each of the injectors 1 to 4 in the correction control process of FIG. A correction pulse having a pulse width of “INJ clock period × predetermined number Np1” is output.

  And the microcomputer 25 of ECU11 functions as each means of following <1>-<3> by performing the interruption process of FIG. 10 about each of the injectors 1-4 which output the pulse for a correction | amendment.

<1> Means for measuring the pulse width of the correction pulse using the ECU clock (S310 to S340).
<2> INJ clock necessary for setting the ADC cycle to the set ADC cycle based on the ratio between the actual pulse width, which is the result of measuring the pulse width of the correction pulse using the ECU clock, and the set pulse width Means for calculating the necessary count number (S350, S360).

  <3> Means (S370, S380) for transmitting an ADC cycle correction value, which is a value obtained by subtracting a fixed basic count from the calculated required count, to the injector that has output the correction pulse as cycle information representing the required count ).

  Then, the control IC 31 of each of the injectors 1 to 4 stores the ADC cycle correction value transmitted to itself from the ECU 11 in the correction value storage unit 45, so that both the cycle storage unit 44 and the correction value storage unit 45 have the same. The total count number stored is set to the necessary count number calculated on the ECU 11 side (S130 in FIG. 8).

  Therefore, the ADC cycle measured using the INJ clock in the control ICs 31 of the injectors 1 to 4 is corrected to the set ADC cycle with the ECU clock cycle being true. In this example, the pulse width of the correction pulse output by the control IC 31 using the INJ clock is measured with the ECU clock cycle as true, and the necessary count is corrected based on the measurement result.

In this embodiment, both the cycle storage unit 44 and the correction value storage unit 45 correspond to the storage unit, and the sum of values stored in both the cycle storage unit 44 and the correction value storage unit 45 is the same. The value corresponds to the clock count number for measuring the ADC cycle. The correction pulse corresponds to the specific signal, and among the edges of the correction pulse, the rising edge that occurs first corresponds to the first signal, and the falling edge that occurs later corresponds to the second signal. Corresponds to the signal. The pulse width of the correction pulse corresponds to the time interval from the first signal to the second signal in the specific signal. The necessary count number corresponds to the clock count number for setting the ADC cycle to the set ADC cycle.

Next, a specific example of the operation of the first embodiment is shown in FIG.
In the specific example of FIG. 11, the set values for design are as follows.
-Set ECU clock cycle = 1 ns.

・ Setting INJ clock cycle = 5 ns.
Set ADC cycle = 10 μs.
・ Setting pulse width = 30 μs.

  For this reason, the basic count number is 2000 (= 10 μs ÷ 5 ns) corresponding to 10 μs, and the predetermined number Np1 for determining the pulse width of the correction pulse is 6000 (= 30 μs ÷ 5 ns) corresponding to 30 μs.

  In FIG. 11, the horizontal axis is a time axis in which the ECU clock cycle is true. In FIG. 11, “ECU standard” means “based on ECU clock period”, that is, “ECU clock period is true”. Here, it is assumed that the ADC cycle correction target is, for example, the injector 1 (INJ1).

  In the specific example of FIG. 11, when the free run time in the microcomputer 25 of the ECU 11 is 10000, the control IC 31 of the injector 1 sets the correction pulse to the communication line LC to be high and the free run time is 39940. The control IC 31 makes the correction pulse low.

  Therefore, the pulse width of the correction pulse is a result of measurement using the ECU clock, and the actual pulse width calculated in S340 of FIG. 10 is 29.94 μs (= 39940 ns−10000 ns). The actual INJ clock calculated in S350 of FIG. 10 is 4.99 ns (= (29.94 μs ÷ 30 μs) × 5 ns), and the necessary count calculated in S360 of FIG. 10 is 2004 (= 10 μs ÷ 499 ns), and the ADC cycle correction value calculated in S370 of FIG. 10 is 4 (= 2004-2000). Further, the ADC cycle correction value (= 4) is transmitted from the ECU 11 to the injector 1 (S380 in FIG. 10).

Then, the control IC 31 of the injector 1 stores the ADC cycle correction value (= 4) received from the ECU 11 in the correction value storage unit 45 (S130 in FIG. 8).
For this reason, if the control IC 31 of the injector 1 receives an ADC start instruction from the ECU 11 at time ts in FIG. 11, the sensor signal A / A every “4.99 μs × (2000 + 4) = 10 μs” from that time point. D conversion will be performed. Then, the pressure value data every 10 μs is transmitted to the ECU 11.

  In FIG. 11, in order to easily understand the difference between before and after the correction of the ADC cycle, the sensor signal A for every “4.99 μs × 2000 = 9.98 μs” in the period before the time ts. It is shown that the / D conversion is performed.

  According to the fuel injection control system 10 as described above, the ADC cycle in each of the injectors 1 to 4 (specifically, the ADC cycle in the signal processing device 30 (control IC 31) provided in each of the injectors 1 to 4) is The ECU clock cycle can be set to true and can be corrected to the set ADC cycle.

For this reason, even if the INJ clock period for each of the injectors 1 to 4 is different due to variations, the ADC periods of the injectors 1 to 4 can be made to coincide.
Therefore, the problem described with reference to FIGS. 4 to 7 (that is, a decrease in fuel injection control accuracy due to a difference in the ADC cycle in each of the injectors 1 to 4) can be prevented. For example, FIG. 12 is a graph showing the same contents as FIG. 7, but the solid line waveform in FIG. 12 is a waveform when the technique of the present embodiment is applied. The solid line waveform in FIG. 12 is a waveform for detecting the fluctuation state of the fuel pressure accompanying the fuel injection of the injector 1 as in the solid line waveform in FIG. 7, but is almost the same as the true dotted line waveform. Yes. Therefore, it is possible to correctly detect the fluctuation state of the fuel pressure.

  In addition, for each of the injectors 1 to 4, variation from the set ADC cycle of the ADC cycle can be suppressed. If the accuracy of the ECU clock cycle is set higher than the accuracy of the INJ clock cycle, the ADC conversion cycle is corrected to the set ADC cycle by each of the injectors 1 to 4 on the basis of the highly accurate ECU clock cycle. Because you can. For example, assuming that the accuracy of the INJ clock cycle is ± 1% and the accuracy of the ECU clock cycle is ± 0.5%, the accuracy of the ADC clock cycle is changed from ± 1% in the case of no correction to the accuracy of the ECU clock cycle. Can be improved to the same ± 0.5%. Note that the accuracy of the ECU clock cycle may be equivalent to the accuracy of the INJ clock cycle as long as the ADC cycles in the injectors 1 to 4 are only matched.

[First Modification]
In the interrupt processing of FIG. 10, S350 and S360 may be integrated, and the necessary count number may be calculated by the following equation 4. Expression 4 is an expression obtained by combining Expression 2 and Expression 3, and is an expression in which calculation of the actual INJ clock period is omitted.

Required count = (Set pulse width ÷ Actual pulse width) x Basic count ... Formula 4
[Second Modification]
For example, the control IC 31 does not include the correction value storage unit 45 and the addition circuit 46, and the comparison circuit 47 is configured to compare the count value of the cycle counter 43 with the stored value of the cycle storage unit 44. good. In that case, the necessary count number itself may be transmitted as the cycle information from the ECU 11 to each of the injectors 1 to 4, and the necessary count number from the ECU 11 may be stored in the cycle storage unit 44.

  However, the configuration in which the above-described ADC cycle correction value is transmitted as cycle information from the ECU 11 has an advantage that the transmission data amount can be reduced by the basic count number.

[Third Modification]
The correction pulse may be a low pulse. In that case, the microcomputer 25 of the ECU 11 may measure the low time from the falling edge to the rising edge of the correction pulse as the actual pulse width.

[Fourth Modification]
Of the signals transmitted to the communication line LC, for example, a specific pulse signal having a fixed time width such as a start bit may be used as the correction pulse.

[Fifth Modification]
The control ICs 31 of the injectors 1 to 4 may output, for example, two high or low pulses as specific signals for correcting the ADC cycle. In that case, the first pulse becomes the first signal and the latter pulse becomes the second signal. For example, if two pulses are set to high, the microcomputer 25 of the ECU 11 replaces the actual pulse width with the time from the rising edge of the previous pulse to the rising edge of the subsequent pulse. What is necessary is just to measure as a time interval from 1 signal to 2nd signal.

However, the use of one pulse as a specific signal for correcting the ADC cycle has an advantage that the processing for outputting the specific signal is simple.
[Second Embodiment]
Next, the fuel injection control system of the second embodiment will be described. As a reference numeral of the fuel injection control system, “10” same as that of the first embodiment is used. The same reference numerals as those in the first embodiment are used for the same components as those in the first embodiment.

  Compared with the first embodiment, the fuel injection control system 10 of the second embodiment is that the microcomputer 25 of the ECU 11 performs the correction instruction process of FIG. 13 instead of the processes of FIGS. 9 and 10, and each injector. The difference is that the control ICs 31 to 4 perform the correction process of FIG. 14 instead of the process of FIG. Further, the control IC 31 of each of the injectors 1 to 4 does not include the pulse generation counter 48 but instead includes a pulse width measurement counter (not shown) that is counted up by the INJ clock.

For example, when the ignition switch is turned on and started, the microcomputer 25 of the ECU 11 performs the correction instruction process of FIG.
As shown in FIG. 13, when starting the correction instruction process, the microcomputer 25 transmits a correction execution instruction to all the injectors 1 to 4 in S410. The correction execution instruction is received by the control ICs 31 of all the injectors 1 to 4.

In step S420, the microcomputer 25 controls the communication driver 29 to output a correction pulse (high pulse in this example) to the communication line LC.
In S420, the microcomputer 25 sets the correction pulse to the communication line LC to high and then returns the correction pulse to low when the value of the free-run counter advances by a predetermined number Np2. For this reason, the pulse width of the correction pulse is “ECU clock period × set number Np2”.

  Then, the microcomputer 25 determines whether or not correction completion notifications from all the injectors 1 to 4 are received in the next S430, and waits until reception of correction completion notifications from all the injectors 1 to 4 is received. The control IC 31 of each of the injectors 1 to 4 transmits a correction completion notice to the ECU 11 in S580 of FIG.

  If it determines with the microcomputer 25 having received the correction completion notification from all the injectors 1-4 in S430, it will progress to S440 and will transmit the ADC start instruction | indication with respect to all the injectors 1-4. Thereafter, the correction instruction process is terminated. The ADC start instruction transmitted in S440 has the same role as the ADC start instruction transmitted in S260 in FIG. 9 of the first embodiment.

  On the other hand, when the control IC 31 of each of the injectors 1 to 4 receives the correction execution instruction transmitted by the microcomputer 25 of the ECU 11 in S410 of FIG. 13, the control IC 31 monitors the pulse output to the communication line LC and transmits the pulse to the communication line LC. Each time an edge occurs, the correction process of FIG. 14 is performed. However, after transmitting a correction completion notification to the ECU 11 in S580 described later, the control IC 31 does not perform the correction process even if a pulse occurs in the communication line LC.

As shown in FIG. 14, when starting the correction process, the control IC 31 first determines in S510 whether or not the edge that has occurred this time is a rising edge, and if it is a rising edge, proceeds to S520. In step S520, the control IC 31 starts counting up from 0 of the pulse width measurement counter using the INJ clock, and then ends the correction processing.

  If the control IC 31 determines in S510 that the edge generated this time is not a rising edge (that is, a falling edge), the process proceeds to S530. In step S530, the control IC 31 stops counting up the pulse width measurement counter.

  In next step S540, the control IC 31 calculates a time obtained by multiplying the count value of the pulse width measurement counter by the set INJ clock cycle as an actual pulse width. In the second embodiment, the actual pulse width is a measurement result obtained by measuring the pulse width of the correction pulse output from the ECU 11 using the INJ clock.

In step S550, the control IC 31 calculates the necessary count number by substituting the actual pulse width calculated in step S540 into the following equation 5.
Required count = (actual pulse width ÷ set pulse width) x basic count ... Formula 5
In the second embodiment, the set pulse width is a design set value of the pulse width of the correction pulse output from the ECU 11, and is a time obtained by multiplying the set ECU clock cycle by the set number Np2. is there.

In the next S560, the control IC 31 calculates the ADC cycle correction value by substituting the necessary count calculated in S550 into the following equation 6 that is the same as the equation 3 described above.
ADC cycle correction value = required count number−basic count number—equation 6
In step S570, the control IC 31 stores the ADC cycle correction value calculated in step S560 in the correction value storage unit 45. In step S580, the control IC 31 transmits a correction completion notification to the ECU 11. Thereafter, the correction process is terminated.

  A transmission source ID indicating the transmission source is attached to the correction completion notification transmitted by the control IC 31 of each of the injectors 1 to 4. For this reason, the microcomputer 25 of the ECU 11 can determine the transmission source of the received correction completion notification. In addition, the correction completion notifications from the injectors 1 to 4 may collide on the communication line LC. For example, in S580, the control IC 31 follows a bus arbitration rule based on a predetermined priority order of transmission source IDs. The transmission of the correction completion notification may be repeated until the transmission of the correction completion notification is successful. In addition, if the transmission order of the correction completion notification is determined in advance, the occurrence of a collision can be avoided.

  In the fuel injection control system 10 of the second embodiment, the microcomputer 25 of the ECU 11 outputs a correction pulse having a pulse width of “ECU clock period × set number Np2” to the communication line LC (FIG. 13). S420).

And control IC31 of each injector 1-4 is functioning as each means of following <A>-<C> by performing the correction process of FIG.
<A> Means for measuring the pulse width of the correction pulse using the INJ clock (S510 to S540).

  <B> INJ clock necessary for setting the ADC cycle to the set ADC cycle based on the ratio of the actual pulse width, which is the result of measuring the pulse width of the correction pulse using the INJ clock, and the set pulse width Means for calculating the necessary count number which is the count number (S550).

<C> By storing an ADC cycle correction value, which is a value obtained by subtracting a fixed basic count from the calculated required count, in the correction value storage 45, the cycle storage 44 and the correction value storage 45
And a means for setting the total count number stored in both to the necessary count number (S560, S570).

  Also in the second embodiment, the ADC period measured using the INJ clock is corrected to the set ADC period with the ECU clock period being true. This is because, in this example, the pulse width of the correction pulse that makes the ECU clock cycle true is measured using the INJ clock, and the necessary count is corrected based on the measurement result.

  Therefore, the same effect as that described in the first embodiment can be obtained. Further, compared to the first embodiment, the correction pulse is output to the communication line LC only once, and the processing for correcting the ADC cycle is performed simultaneously in each of the injectors 1 to 4, so that The time until the correction of the ADC cycle for the injectors 1 to 4 is completed can be shortened.

In addition, about 2nd Embodiment, the same deformation | transformation as the 2nd-5th modification demonstrated about 1st Embodiment can be performed.
In the above embodiment, the ADC cycle is corrected immediately after the ignition switch is turned on and the fuel injection control system 10 is started. For this reason, it is possible to complete the correction of the ADC cycle before the above-described processing of << 2 >> is started. Therefore, appropriate correction of the injection command signal based on the actual injection state can be started early. In other words, the correction of the ADC cycle may be performed before the microcomputer 25 of the ECU 11 starts collecting pressure value data for detecting the fluctuation state of the fuel pressure, or when it is not collected. It is preferable to implement as early as possible after the control system 10 is activated.

[Other variations]
For example, one or both of the sensor PS and the signal processing device 30 may be provided separately from the injectors 1 to 4. When the sensor PS is provided separately from the injectors 1 to 4, the position where the sensor PS is provided is not limited to the fuel intake port of the injectors 1 to 4, but the fuel outlet of the common rail 15 (the common rail of the fuel supply pipe 17. 15) and any position in the fuel passage from the injectors 1 to 4 to the injection ports. The internal combustion engine to which the injectors 1 to 4 inject fuel may be a gasoline engine.

  On the other hand, in the said embodiment, although demonstrated as the form by which the signal processing apparatus 30 was provided in each of the injectors 1-4, it can be said that each of the injectors 1-4 is a signal processing apparatus.

As mentioned above, although embodiment of this invention was described, this invention can take a various form, without being limited to the said embodiment. The above-mentioned numerical values are also examples, and other values may be used.
For example, the functions of one constituent element in the above embodiment may be distributed as a plurality of constituent elements, or the functions of a plurality of constituent elements may be integrated into one constituent element. In addition, at least a part of the configuration of the above embodiment may be replaced with a known configuration having a similar function. 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 by the wording described in the claims are embodiments of the present invention. In addition to the fuel injection control system described above, the ECU 11 and injectors 1 to 4 that are constituent elements of the fuel injection control system, a program for causing the computer to function as the ECU 11, a medium storing the program, A / D conversion The present invention can also be realized in various forms such as a period correction method.

1-4 ... Injector, 10 ... Fuel injection control system, 11 ... ECU (electronic control unit)
, LC ... communication line, 25 ... microcomputer (microcomputer), 26 ... oscillator, 27 ... clock generator, 30 ... signal processor, 32 ... oscillator, 34 ... clock generator, PS ... fuel pressure sensor, 41 ... A / D converter, 43 ... period counter, 44 ... period storage unit, 45 ... correction value storage unit, 46 ... addition circuit, 47 ... comparison circuit

Claims (8)

A signal processing device (30) and an electronic control device (11) connected to be communicable via a communication line (LC);
The electronic control device
Control device side clock generation means (26, 27) for generating a clock of a fixed period;
Information processing means (25) that operates according to a control device side clock that is a clock generated by the control device side clock generation means,
The signal processing device includes:
An A / D converter (41) for A / D converting a sensor signal output from the sensor (PS);
A / D conversion control means (43 to 47) for causing the A / D converter to perform A / D conversion of the sensor signal at a predetermined A / D conversion cycle;
Signal processing device side clock generation means (32, 34) for generating a signal processing device side clock which is a clock used by the A / D conversion control means to measure the A / D conversion cycle;
The signal processing device transmits data representing an A / D conversion result of the sensor signal by the A / D converter to the electronic control device, and the information processing means of the electronic control device is configured to transmit the signal processing device. In the control system (10) that performs processing for controlling the control target (1 to 4) using the data from
The A / D conversion cycle measured by the A / D conversion control means using the signal processing device side clock, the control device side clock cycle as true, and the A / D conversion cycle design setting value A period correcting means (S110, S130, S310 to S380, S420, S510 to S570) for correcting the set period to
Control system characterized by. The control system according to claim 1,
The A / D conversion control means includes:
The signal processing device side clock is counted as the A / D conversion period, which is the time counted by the number of clock counts stored in the storage unit (44, 45).
The period correction means includes
A specific signal that is provided in the signal processing device and includes a first signal and a second signal, and a time interval from the first signal to the second signal is set in advance to the signal processing device side clock. A first means (S110) for outputting a specific signal that is a time counted by a predetermined number to the communication line;
A time interval from the first signal to the second signal in the specific signal that is provided in the electronic control device and is output to the communication line by the signal processing device is measured using the control device side clock. 2 means (S320 to S340),
A measurement result of the time interval provided by the second means, and a set time interval which is a time obtained by multiplying a predetermined set value by a design value of the cycle of the signal processing device side clock provided in the electronic control unit; Third means (S350, S360) for calculating the clock count for setting the A / D conversion period measured by the A / D conversion control means to the set period based on the ratio;
A fourth means (S370, S380) provided in the electronic control device for transmitting the cycle information representing the clock count calculated by the third means to the signal processing device;
Fifth means (S130) that is provided in the signal processing device and sets the clock count number stored in the storage unit to the clock count number represented by the period information transmitted from the electronic control unit to the signal processing device. )When,
A control system comprising: The control system according to claim 2,
The specific signal is one pulse, and of the rising edge and falling edge of the pulse, the edge that occurs first is the first signal, and the edge that occurs later is the second edge. Signal,
The second means measures the pulse width of the specific signal as the time interval;
Control system characterized by. The control system according to claim 1,
The A / D conversion control means includes:
The signal processing device side clock is counted as the A / D conversion period, which is the time counted by the number of clock counts stored in the storage unit (44, 45).
The period correction means includes
A specific signal that is provided in the electronic control device and includes a first signal and a second signal, and a time interval from the first signal to the second signal is set in advance for the control device-side clock. A first means (S420) for outputting a specific signal which is a time counted by a number to the communication line;
A time interval from the first signal to the second signal in the specific signal provided in the signal processing device and output to the communication line by the electronic control device is measured using the signal processing device side clock. A second means (S510 to S540);
A measurement result of the time interval by the second means provided in the signal processing device, and a set time interval that is a time obtained by multiplying the design set value of the cycle of the control device side clock by the set number. A third means (S550) for calculating the clock count for setting the A / D conversion period measured by the A / D conversion control means to the set period based on the ratio;
A fourth means (S560, S570) provided in the signal processing device, for setting the clock count number stored in the storage unit to the clock count number calculated by the third means;
A control system comprising: The control system according to claim 4.
The specific signal is one pulse, and of the rising edge and falling edge of the pulse, the edge that occurs first is the first signal, and the edge that occurs later is the second edge. Signal,
The second means measures the pulse width of the specific signal as the time interval;
Control system characterized by. The control system according to any one of claims 1 to 5,
There are a plurality of the signal processing devices,
The period correcting means corrects the A / D conversion period in the plurality of signal processing apparatuses to the set period with the period of the control device side clock as true;
Control system characterized by. The control system according to claim 6,
The information processing means of the electronic control device includes:
To control the control target based on a difference between the data transmitted from any one of the plurality of signal processing devices and the data transmitted from any one of the other The processing of
Control system characterized by. The control system according to claim 7,
The signal processing device is provided in each of a plurality of injectors (1 to 4) for injecting fuel into each cylinder of the internal combustion engine (13),
The controlled object is each of the injectors,
The sensors are respectively provided at predetermined positions in the fuel passages from the fuel outlet of the pressure accumulating container (15) that stores fuel pumped by the fuel pump (21) to the injection ports of the injectors, A fuel pressure sensor that outputs a sensor signal of a corresponding voltage,
The information processing means of the electronic control device includes:
Of the injectors, the data transmitted from the signal processing device of an injector that has performed fuel injection and the data transmitted from the signal processing device of another injector that has not performed fuel injection. Based on the difference, a variation state of the fuel pressure due to the injection operation of the injector that has performed the fuel injection is detected, and a process for correcting the injection command for the injector that has performed the fuel injection is performed based on the detection result. ,
Control system characterized by.