JP2576141B2 - Status output device of control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention [Industrial Application Field] The present invention relates to a device for detecting a state of various control systems, for example, a malfunction of a controlled device such as an internal combustion engine or a state detecting means such as an oxygen sensor. The present invention relates to a state output device of a control system that outputs a diagnosis result of the above and a control parameter of the control circuit to an external measuring device.

2. Description of the Related Art In a control system that controls the operation of an internal combustion engine by an electronic control device such as a microcomputer, an abnormality of each element constituting the system, for example, various sensors and actuators, is detected, and an inspector is notified of the abnormality. A failure diagnosis process for notifying the user is performed. In this failure diagnosis processing, the failure diagnosis result for each element obtained by a predetermined failure diagnosis routine in the electronic control unit is output to a dedicated output terminal conventionally provided corresponding to each element. The inspector recognizes the failure point based on which output terminal the signal to that effect appears, and takes measures. Also,
In order to detect other detailed control system status,
For example, an air-fuel ratio adjustment signal corresponding to the air-fuel ratio correction amount or a dedicated output terminal for measuring the ignition timing of a fixed advance angle may be provided.

For this reason, a large number of output terminals must be provided in accordance with each signal. In addition to various device configurations attached to the output terminals, the system becomes complicated and large, the system manufacturing process becomes complicated, and the cost is reduced. Had a disadvantage.

In order to solve this problem, a control device has been proposed which solves the above problem by outputting different data from one output terminal according to a predetermined input signal (Japanese Patent Application Laid-Open Nos. 57-31005 and 57-31005). 57-59039).

[Problems to be Solved by the Invention] However, the above-described device has the following problems and has not been sufficient.

That is, since each signal output from the terminal has a single form, a single external measuring device is used, and as a result, the applicable range is narrow. That is, the former (Japanese Patent Application Laid-Open No. 57-31005) only outputs a diagnostic signal indicating the abnormality of each sensor in the form of a voltage value, so that it must be measured with a predetermined voltmeter. Furthermore, since it is not a signal form capable of outputting precise data, measurement and detection of control parameters and the like were impossible.

The latter (Japanese Patent Application Laid-Open No. 57-59039) outputs a state signal, a diagnostic signal and a real signal of a sensor only by the lighting state of the lamp. As a result, precise data cannot be output as in the former case, and it is impossible to detect control parameters and the like that can be analyzed accurately, and a lamp can only make a qualitative judgment visually.

As described above, since the conventional technique outputs only one signal form, the degree of freedom of the measuring device is low, and it is not always possible to always sufficiently detect an abnormality. For example, an abnormality having a relatively clear cause in a control device of a vehicle internal combustion engine can be sufficiently analyzed by a simple analog or digital external measuring device at each repair shop or agency. However, for abnormalities that cannot be analyzed with an inexpensive external measurement device because the causes are complicatedly intertwined with each other, it is necessary to analyze with a precise external measurement device at a specific base such as a service center. However, since the control device itself has such an output configuration that it cannot output such a precise signal, it has not been possible to connect a current external terminal to a precise external measurement device and immediately analyze the signal. For this reason, there is a possibility that parts are unnecessarily replaced while the cause analysis is insufficient.

Conversely, if the control device outputs only the precise output of control parameters, etc., there is no precise external measurement device at the level of a normal repair shop or agency, and precise measurement data cannot be detected. There was a possibility that parts could be replaced unnecessarily.

Configuration of the Invention Accordingly, the present invention has the object of solving the above problems, and has adopted the following configuration.

[Means for Solving the Problems] That is, as the gist of the present invention, as shown in FIG. 1, the state detecting means M1 detects predetermined state data from the controlled device M2, and the arithmetic unit M3 Is applied to a control system that controls the controlled device M2 based on at least parameters obtained by performing predetermined processing on the state data, and a common input / output terminal M7 to which a plurality of external devices M4 are selectively connected. The external device M4 connected to the input / output terminal M7, the state data detected by the state detecting means M1, the state diagnostic data of the state detecting means M1, the state diagnostic data of the controlled device M2 and the A state output device of a control system that outputs at least one of parameters as output data, wherein a processing capability of an external device input to the input / output terminal M7 from the external device M4 An output mode selecting unit M5 for selecting an output mode of the output data based on a command signal corresponding to the output signal, and an output for outputting the output data to the external device M4 in the output mode selected by the output mode selecting unit M5. And M6. A state output device for a control system, comprising:

[Operation] The arithmetic unit M3 performs a predetermined process based on predetermined state data of the controlled device M2 detected by the state detection means M1, and obtains a control parameter. Further, the arithmetic unit M3 controls the controlled device M2 with this parameter. In order to diagnose the state of such a control system, the state output device of the present invention uses state data by state detection means M1,
At least one of the status diagnosis data of the status detection means M1, the status diagnosis data of the controlled device M2, and the parameters is output to the external device M4 as output data. The external device M4 receives the data and performs a predetermined display or performs a predetermined determination process to detect the state of the control system.

Here, the output data is not always output as it is, and an output mode selection is performed according to a command signal input from the external device M4 via the input / output terminal M7 and corresponding to the processing capability of the external device M4. Means M5, the output form of data that can be processed by the external device M4, for example, digital or analog,
Select whether the signal is analogous to a step signal or similar to the original signal, serial or parallel in the case of digital, or whether the data is represented by bits or hexadecimal codes. Alternatively, an output mode according to the degree of accuracy that can be processed by the external device, for example, a baud rate when serially outputting a digital signal is selected.

According to the selection result, the output means M6 outputs the corresponding data to the external device M4 in the selected output form.
Thus, a data signal adapted to the processing capacity of the external device M4 can be output.

Example Next, an example of the state output device of the present invention will be described.
The present invention is not limited to these, and includes various embodiments in a range not departing from the gist thereof.

FIG. 2 is a control system configuration diagram of a gasoline-type internal combustion engine provided with the state output device of the present invention.

In the figure, an internal combustion engine 1 has a combustion chamber 6 formed by a cylinder 2, a piston 3, a cylinder block 4, and a cylinder head 5. An ignition plug 7 is provided in the combustion chamber 6. The pressing force from the piston 3 is transmitted to driving wheels (not shown) via various devices such as a transmission (not shown).

The intake side of the combustion chamber 6 of the internal combustion engine 1 communicates with an intake pipe 9 via an intake valve 8. A surge tank 10 for absorbing the pulsation of the intake air is provided upstream of the intake pipe 9.
A throttle valve 11 is provided upstream of the surge tank 10. The opening of the throttle valve 11 is adjusted by an operation of an accelerator pedal 12 by a driver.

On the other hand, the exhaust side of the combustion chamber 6 is
It communicates with the exhaust pipe 17 and a catalytic converter 17a for purifying exhaust gas.

The fuel system includes a fuel supply source including a fuel tank and a fuel pump (not shown), and a fuel injection valve 18 disposed in a fuel supply pipe and an intake pipe 9.

The ignition system includes an igniter 19 for outputting a high voltage necessary for ignition and a distributor 20 for distributing and supplying the high voltage generated by the igniter 19 to the ignition plug 7 in conjunction with a crankshaft (not shown). Have been.

Further, the internal combustion engine 1 serves as a detector, which is provided in front of the intake pipe 9 to measure an intake air flow rate.
1. An intake air temperature sensor 32 provided in the intake pipe 9 for measuring the intake air temperature, a throttle position sensor 33 for detecting the opening of the throttle valve 11 in conjunction with the throttle valve 11, and cooling the cylinder block 4. A water temperature sensor 34 provided in the system to detect a cooling water temperature; an O ₂ sensor 35 provided in the exhaust pipe 17 to detect the residual oxygen concentration in the exhaust gas as an analog signal; and the throttle position sensor 33
And an idle switch 36 which is provided integrally with and outputs an ON signal when the throttle valve 11 is fully closed.

Inside the distributor 20, a rotation angle signal is output every 1/24 rotation of the camshaft of the distributor 20, that is, at every integral multiple of the crank angle of 0 ° C. to 30 ° C., and at every rotation of the camshaft of the distributor 20. That is, a rotation sensor 38 for outputting two crank angle position signals G1 and G2 once for each two rotations of a crankshaft (not shown) is provided.

The signals from the sensors are input to an electronic control unit (hereinafter simply referred to as an ECU) 40, and the ECU 40 outputs control signals to the fuel injection valve 18 and the igniter 19 of the internal combustion engine 1. Thus, the internal combustion engine 1 is controlled.

Next, the configuration of the ECU 40 will be described with reference to FIG.

The ECU 40 has a CPU 40a, a ROM 40b, a RAM 40c, a backup RAM 40
It is composed mainly of d and the clock 40z. CPU40a
Are common bus 40e, input / output port 40f, input port 40
g, input / output with the outside via output port 40h. The power supply circuit 41 is connected to the energizing line 42,
Is connected to the battery 44 via the key switch 43.

The backup RAM 40d is configured to be supplied with power from another power supply circuit 46 and retain the stored contents even when the key switch 43 is turned off and the power supply to the ECU 40 is stopped.

The ECU 40 includes a buffer 40 for the detection signal of each sensor described above.
i, 40j, 40k, 40w, 40q, multiplexer 40n, A / D converter 40p
And these detection signals are input to the C
Input to PU40a.

Also, the ECU 40 includes a waveform shaping circuit 40s for a rotation signal or the like,
These signals are input to the CPU 40a via the input port 40g.

Further, the ECU 40 is connected to the drive circuit 40 via the output port 40h.
The fuel injection valve 18 calculated from the detection results of each sensor at t
Output a calculated fuel injection signal indicating the valve opening time of the
Igniter 1 calculated and calculated from the detection results of each sensor in 40s
A calculated ignition timing signal indicating the off time of 9 is output.

In addition, command signals T1 and T2 from an external measuring device 50 attached as needed are input to the input port 40g. Further, an output mode switching circuit is provided for the external measuring device 50.
The signal from 40u is output. The output mode switching circuit 40u receives the control signal D1 and the data signal D2 from the CPU 40a via the output port 40h, and selects digital or analog based on the control signal D1 among them,
The data signal D2 from the CPU 40a is output to the external measuring device 50 in the selected output form.

Next, the configuration of the output mode switching circuit 40u is shown in FIG. That is, of the signals from the CPU 40a, the input side of one control signal D1 is connected to the base side of the NPN transistor Tr whose emitter is grounded, and the collector side is connected to the emitter side via the diode Di. The input side of the other control signal D2 among the signals from the CPU 40a is connected to an output terminal VF via a general-purpose inverter In and a resistor R1. The output terminal VF of the resistor R1 is connected to the collector of the transistor Tr via a capacitor C. The inverter In side of the resistor R1 is also connected to the power supply side via the resistor R2.

Next, control examples executed by the ECU 40 and the operation of the related devices will be described with reference to FIGS.

FIG. 5 shows a general flowchart of the processing executed by the CPU 40a. First, when the process is started, step 10
Initialization is performed at 0. That is, RAM40c, backup R
Predetermined initial settings of the AM 40d, the input / output port 40f, the input port 40g, the output port 40h, and the like are performed.

Next, at step 110, the basic fuel injection amount Tp is calculated from the rotational speed NE of the internal combustion engine and the intake air amount Q. Next, in step 120, various correction coefficients for the basic injection amount Tp are calculated. That is, the correction amount FTH based on the internal combustion engine cooling water temperature THW
W, the correction coefficient for feedback control so acceleration increase FVTA by the throttle opening .theta.TH, bulking FSTA executed predetermined time immediately after starting the internal combustion engine, the exhaust gas is the state of the O ₂ sensor output voltage Ox be close logical air-fuel ratio Calculate FAF etc.

In step 130, the final fuel injection amount T is calculated according to the following equation.
AU is calculated and stored in the RAM 40c.

TAU = Tp × FAF × FTHW × (FVTA + FSTA) In step 140, the basic ignition timing SBASE is calculated from the on / off state of the internal combustion engine rotational speed NE, the intake air amount Q, and the throttle fully closed signal IDL. In step 150, a correction coefficient STHW based on the internal combustion engine cooling water temperature THW is obtained. step 1
At 60, the final ignition timing SADV is calculated according to the following formula, and RA
Store in M40c.

SADV = SBASE + STHW Output signals are sent to the drive circuits 40t and 40s according to the calculated injection amount TAU and ignition timing SADV.

Next, in step 170, the external output terminal V for diagnosis is used.
Represents a processing routine for data output to F. The details are shown in FIG. 6 and FIG.

First, in step 171, the signal T1 from the external measuring device 50
Is turned on. If it is on, it is determined in step 172 whether or not the idle switch 36 is on. If ON, stores the state of the O ₂ sensor output voltage Ox at step 173 to a predetermined address VF1 of RAM40c. If it is off, the state of the correction coefficient FAF is stored in RAM4 in step 174.
It is stored at a predetermined address VF1 of 0c.

If the signal T1 is off in step 171 and a negative determination is made, in step 175 the signal T1 from the external measuring device 50 is
It is determined whether 2 is on or not.
The process proceeds to 72, and if it is on, the process of step 176 is executed. In step 176, RAM value output data (digital output data) in the RAM 40c described later is stored in a predetermined address VF2 of the RAM 40c. When the predetermined data is stored in the RAM 40c in this way, the process is temporarily terminated. Thereafter, the same processing is repeated, and the content of the predetermined address VF1 or VF2 of the RAM 40c is constantly updated.

Next, the output processing of the data stored in the predetermined address VF1 or VF2 of the RAM 40c will be described with reference to the flowchart of FIG. This process is an interrupt process every 4 ms.

First, in step 180, it is determined whether the current mode is the RAM value output mode. That is, if the signal T1 is off and the signal T2 is on, the RAM value output mode is determined to be affirmative. If an affirmative determination is made, the signal D1 input to the output mode switching circuit 40u is set to a low level L in step 182 next.

When the signal D1 becomes low level L, the transistor Tr of the output form switching circuit 40u shown in FIG. 4 is turned off, and one end of the capacitor C is opened. Therefore, when the other control signal D2 from the CPU 40a is inverted by the inverter In, it is output to the terminal VF in the same form. That is, a digital signal can be output.

Thus, in step 184, the predetermined address VF2 in the RAM 40c is
Is output one bit at a time as a serial digital signal. That is, the data stored with the contents as shown in FIG. 8 is output immediately after the signal D1 becomes L in the order shown in the timing chart of FIG.

First, when the signal D1 changes from H to L, a header having a high level continuously for 16 bits is output. Then one bit,
A low-level start bit is output, and then an ECU 40 identification code is output. The ECU40 identification code is the ROM
This indicates the type of the ECU 40 stored in the storage 40b, such as the type of the internal combustion engine, the part number of the ECU 40, or the like. The identification code of this ECU 40 is the RAM shown in Fig. 8.
The values are output in order. The detailed data structure is, as shown in FIG. 10, composed of one start bit, eight data bits, one identification bit and one stop bit.

The LSB information and offset value information of each data are included in the ECU code, and can be easily determined by the external measurement device 50. The diagnostic code (a code representing a diagnostic result by diagnostics) outputs an abnormality diagnostic result of each sensor as bit information of a RAM value. For example, when the water temperature sensor 34 is abnormal, the bit 0 becomes “1”, and when the throttle position sensor 33 is abnormal, the bit 1 becomes “1”. This method has the advantage that even if a plurality of abnormalities are detected, they can be output at once. However, since the bit position may have been changed in some ECUs, an 8-bit long
It may be coded in hexadecimal and output. For example, when the water temperature sensor 34 is abnormal, the value is "11", and when the throttle position sensor 33 is abnormal, the value is "12".
If all the detection results are normal, “00” is set.

If the identification bits of all the diagnostic codes are set to low level, it can be distinguished from other RAM values. In addition, E
If only the identification bit of the first RAM value output after the CU code is set to low level and the identification bits of the other RAM values are set to high level, even if the RAM value is output cyclically and repeatedly, it can be specified. Since only the identification bit of the RAM value is low, it can be corrected even if a communication error occurs.

Returning to the description of FIG. 7, if a negative determination is made in step 180, it is determined in step 186 whether the RAM value is being output. That is, an affirmative decision is made until the last data of the cyclically output RAM value group is completely output, and the above steps 182 and 184 are executed. When output is complete,
In step 186, a negative determination is made, and the signal D1 input to the output mode switching circuit 40u is first set to the high level H in step 188. In this way, when switching output data, RAM
When switching from the value output to another output mode (analog output in this case), since the switching is performed after one cycle of the output of the RAM value is completely completed, no communication error occurs.

When the signal D1 is set to the high level H in step 188, the transistor Tr of the output configuration circuit 40u shown in FIG. 4 is turned on, and one end of the capacitor C is fixed at substantially the ground level. Therefore, the other control signal from CPU 40a
D2 is inverted by the inverter In, and then charges and discharges the capacitor 46 via the resistors R1 and R2 based on the ON / OFF signal. Therefore, the output voltage is averaged
An analog voltage value corresponding to the duty of control signal D2 from CPU 40a is output to terminal VF.

Thus, next at step 190, the predetermined address VF1 in the RAM 40c
Is output as a corresponding voltage as an analog signal. That is, in the case of the output of the correction coefficient FAF, as shown in Table 1, the signal is output in five steps corresponding to the duty of the signal D2 divided into five steps according to the value of the FAF.

In the case of the output of the correction coefficient O ₂ sensor, as shown in Table 2,
The signal is output as a two-step voltage value corresponding to the duty of the signal D2 divided into two steps according to the value of Ox.

The relationship between the duty of signal D2 and the output voltage of terminal VF is
For example, if the signal D2 is low for 4 ms (0 V) and high for 12 ms (5
If the duty is V), the terminal VF has an output voltage of 1.25V.

Thus, the process is once completed, and then the same process is repeated.

In response to these outputs, an external external measuring device 50 displays the output contents on a potentiometer or a digital display device. FIG. 11 shows a configuration example 51 of an external measuring device 50 for FAF or Ox measurement, and a connector 51b for connecting the signal T1 and T2 input terminals of the ECU 40 by selecting the rotation switch 51a.
Is configured to output ON only for the signal T1. When this connector 51b is connected to the terminal of the ECU 40,
The ECU 40 that has received the signal T1 selects the FAF or Ox signal content according to the idle on / off and stores it in the RAM 40c according to the flowchart of FIG. 6 (steps 173 and 17).
4) According to the flowchart of FIG. 7, a voltage having a value corresponding to the FAF or Ox signal is output (step 190). The external measuring device 51 of this example receives the output voltage from the connector 51b and displays the output voltage on the voltage meter 51c. Although the signal T1 is output by the rotary switch 51a, the signal T1 may be given to the ECU 40 simply by short-circuiting the terminal on the ECU 40 side by connecting the connector 51b. Although the output of FAF or Ox is selected by turning on / off the idle switch 36, the ECU 40 may select the output by the instruction of the rotation switch 51a of the external measuring device 51.

Next, FIG. 12 shows a configuration example 53 of an external measuring device 50 for measuring a RAM value. The external measuring device 53 of this example is configured to output ON only the signal T2 to the connector 53b with the signal T1 and T2 input terminals of the ECU 40 by selecting the key switch 53a. According to ECU40
Are stored in the RAM 40c (step 17).
6) In accordance with the flowchart of FIG. 7, a serial digital signal is output (step 184). The external measuring device 53 of this example receives the digital signal and displays the numerical value of each parameter on the liquid crystal digital display unit 53c.
The signal T2 may be given to the ECU 40 simply by short-circuiting the terminal on the ECU 40 side by connecting the connector 53b.

The control circuit 55 of the external measuring device 53 for measuring the RAM value
The configuration shown in the figure can be adopted. That is, the control circuit 55 mainly includes the CPU 55a, the ROM 55b, the RAM 55c, the clock 55d, and the like. The CPU 55a has a common bus 55e,
Input and output with the outside via input port 55g and output port 55h. The power supply circuit 55i is connected to a power supply battery 55 through a switch 55j.
Connected to k.

The CPU 55a inputs a serial RAM value digital signal via the buffer 55m. The signal from the key switch 53a is input via a waveform shaping circuit 55n.

Further, the CPU 55a outputs the signal T2 to the E through the output port 55h.
By outputting the control signal to the drive circuit 55t by outputting to the CU 40, the necessary precautions for the liquid crystal digital display device 53c,
Or the RAM value is displayed in real time.

The measurement display processing is performed as shown in FIG. This processing is repeatedly executed at predetermined time intervals. That is,
In step 200, it is determined whether or not the mode is the measurement mode based on the instruction content of the key switch 53a. If the mode is not the measurement mode, the process temporarily ends. If in the measurement mode, a signal T2 is output in step 210. As a result, on the ECU 40 side, step 176 is executed in the above-described VF processing of FIG. 6, the RAM value is stored in the predetermined address VF2 of the RAM 40c, and in the output processing of FIG. Is output to the external measuring device 53 side by bit as serial data.

Therefore, in step 220, the serial data signal is read. Next, in step 230, the first diagnostic code portion is extracted from the data, and from the bit information,
An abnormal sensor is determined and displayed on a predetermined portion of the liquid crystal display device 53c. Next, in step 240, each RAM value is converted to a decimal number and displayed at a position corresponding to each parameter. In this way, the processing is once completed, and thereafter, the same processing is repeated, and the ECU 4
Each control parameter of 0 is displayed in real time.

In the RAM value output process of the above embodiment, the header was immediately output to the external output circuit 53.However, the difference in the clock used for the ECU 40 and the difference in the cycle of the timer interrupt that differs for each type of the ECU 40 are determined by an external digital As shown in FIG. 15, before the header is output after the signal T2 input is turned on and before the header is output, clock information, for example, using a timer interrupt every 4 ms, can be automatically determined and corrected at In this case, a signal that is inverted every 4 ms may be output. This clock information is taken in by the external measuring device 53, and the communication speed is determined. This makes it possible to automatically correct a clock shift or the like, and to provide an inexpensive and more accurate in-vehicle state output device.

Further, in the above-described embodiment, the basic clock (baud rate) for serially outputting the internal parameter has only one kind. However, a plurality of baud rates are provided, that is, a plurality of kinds are provided as the accuracy of the output data. The output may be switched according to the capability of the external measuring device 53.

That is, when an external measuring device 53 capable of measuring a large amount of high-speed, high-precision data in real time is connected, the baud rate is increased to increase the processing capacity. On the other hand, when an inexpensive external measuring device 53 is used, the amount of data processing is reduced,
Since the data cannot be processed unless the data has low accuracy, a low baud rate can be sufficiently used. By doing so, each repair shop, dealer, or the like can perform sufficient analysis only by having the inexpensive external measuring device 53. If the cause of the inconvenience is intricately entangled and the inexpensive external measuring device 53 cannot identify the cause, prepare an expensive external measuring device 53 at a specific base such as a service center, and concentrate By analyzing the data, a more detailed analysis can be performed.

By switching the baud rate and outputting the internal parameters in this way, there is a secondary effect of reducing the cost increase of the market service system.

In the above embodiment, the external measuring devices 51 and 53 are dedicated to analog or digital. However, the external measuring devices 51 and 53 are integrated as a device capable of measuring both analog and digital, and the signal T1 And the signal T2 may be selected and output, and the measurement may be performed by switching between an analog measurement unit and a digital measurement unit according to the request.

Further, the display of the measurement data of the digital external measuring device 53 has been performed on the liquid crystal digital display unit 53c, but an LHD corresponding to the sensor is further provided for displaying an abnormality, and the abnormality is warned by lighting the LHD. It may be.

Since the present embodiment is configured as described above, the signal T
By switching between 1 and T2, analog data and digital data can be switched and output. Therefore, different types of data required by the multiple types of external measuring devices 51 and 53 can be output from one terminal VF, and the external measuring device 50 to be applied is also flexible with the saving of terminals and wire harnesses. Will be high.

Therefore, the failure analysis is suitably performed at an accuracy level corresponding to the repair stage. Adjustment of each component of the control system,
For example, it becomes easy to adjust the air-fuel ratio of the internal combustion engine at the time of factory shipment of an automobile.

In the above embodiment, each sensor 31, 32, 33, 34, 35, 36,
38 corresponds to the state detecting means M1, and the internal combustion engine 1 is a controlled device.
Corresponds to M2, ECU 40 is arithmetic unit M3, output form selection means M5
And the output means M6, of which the processing of steps 100 to 160 corresponds to the processing as the arithmetic device M3,
To 190 correspond to the processing as the output form selection means M5, the output form switching circuit 40u corresponds to the output means M6, and the ECU 40
The combination of the signal T1 and T2 input terminals and the output terminal VF corresponds to the common input / output terminal M7 to which a plurality of external devices M4 are selectively connected, and the external measuring devices 50, 51, and 53 correspond to the external device M4. I do.

According to the present invention, the state output device of the control system according to the present invention is configured such that the output form selecting means M5 receives a command signal from the external device M4 corresponding to the processing capability of the external device M4 input via the input / output terminal M7. The output mode of the data to be output to the external device M4 is selected, and the output unit M6 outputs the input / output terminal in the selected output mode.
The corresponding data is output to the external device M4 via M7.

Therefore, without adding terminals and wire harnesses,
Depending on the processing capacity of the external device M4, data can be output in an output form that can be processed by the external device M4, so that it can be adjusted with the accuracy of the adjustment of the control system at the time of shipment and the subsequent inspection and repair stage. Suitable measurement data can be obtained. Therefore, it is unnecessary to replace parts unnecessarily. Furthermore,
Since the output form of the data is automatically selected by the command signal corresponding to the processing capacity from the external device M4, it is not necessary to force the operator to set a complicated output form, so that the operation is effective. Become.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a basic configuration of the present invention, FIG. 2 is a configuration diagram of a control system of an embodiment, FIG. 3 is a block diagram of an ECU, FIG.
FIG. 5 is a circuit diagram of an output mode switching circuit, FIG. 5 is a general flowchart of processing executed by a CPU, and FIG.
FIG. 7 is a flowchart of the output process, FIG. 8 is an explanatory diagram of data stored at a predetermined address in the RAM, FIG. 9 is a timing chart of RAM value output,
Fig. 10 is a detailed explanatory diagram of each signal, and Fig. 11 is FAF or O.
Schematic explanatory diagram of an external measuring device for x measurement, FIG. 12 is a schematic explanatory diagram of an external measuring device for measuring a RAM value, and FIG. 13 is a block diagram of a control circuit used in the external measuring device for measuring a RAM value. FIG. 14, FIG. 14 is a flowchart of the processing performed there,
FIG. 15 shows a timing chart of another example of RAM value output. 1 ...... engine, 32 ...... intake air temperature sensor 33 ...... throttle position sensor 34 ...... water temperature sensor, 35 ...... O ₂ sensor 36 ...... idle switch, 38 ...... rotation sensor 40 ...... electronic control unit (ECU) 40u …… Output type switching circuit 50,51,53 …… External measuring device

 ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Kazuya Sanada 1-1-1, Showa-cho, Kariya-shi, Aichi Japan Inside Denso Co., Ltd. (56) References JP-A-61-118802 (JP, A) JP-A-58 JP-A-144912 (JP, A) JP-A-59-230403 (JP, A) JP-A-55-39951 (JP, A) JP-A-62-81103 (JP, U)

Claims (7)

(57) [Claims] The present invention is applied to a control system in which predetermined state data is detected from a controlled device by state detection means, and a controlled device is controlled based on parameters obtained by performing at least predetermined processing on the state data by an arithmetic unit. And a common input / output terminal to which a plurality of external devices are selectively connected, and to the external device connected to the input / output terminal, status data detected by the status detection unit, the status detection unit A state output device of a control system that outputs at least one of state diagnostic data of the controlled device, state diagnostic data of the controlled device, and the parameter as output data, wherein an external device is input to the input / output terminal from the external device. Output form selecting means for selecting an output form of the output data based on a command signal corresponding to the processing capability of the apparatus; and the output form Output means for outputting the output data to the external device in an output form selected by the selection means. 2. The state output device of the control system according to claim 1, wherein said output mode selection means selects an output mode from an analog output and a digital output. 3. The state output device of a control system according to claim 2, wherein said analog output is an output based on a step signal or a similar signal of an original signal. 4. The state output device of a control system according to claim 2, wherein said digital output is an output based on a serial signal or a parallel signal. 5. The status output device of a control system according to claim 4, wherein said digital output is displayed in bits or hexadecimal numbers. 6. The state output device of the control system according to claim 1, wherein said output mode selection means selects an output mode in accordance with a degree of accuracy that can be processed by an external device. 7. The output form is a baud rate when a digital signal is serially output.
The status output device of the control system according to the above.