JPH0962336A - Pseudo pulse signal output device - Google Patents

Abstract

(57) Abstract: A pseudo pulse signal output device capable of outputting a pulse pattern of a complex sensor signal is realized, and control of a developed program is easily verified. A decoder 12, which receives a command including a pulse frequency from a host computer 43, interprets the command, sets a pulse frequency in clock generators 14 to 24 for the first to sixth cylinders, and a pattern memory for cylinder discrimination. Also for the circuit 40, every time a predetermined number of output pulses of the OR circuit 70 are counted, a high level signal is repeatedly output to the AND circuits 46 to 56 for the first to sixth cylinder clock generators 14 to 24 in order. Make the setting. As a result, a pulse signal obtained by sequentially combining the pulse signals from the first cylinder clock generator 14 to the sixth cylinder clock generator 24 according to the pseudo rotation of the internal combustion engine is output, and the pulse pattern of the complicated sensor signal is output. Can be output.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pseudo pulse signal output device, and more particularly to a pseudo pulse signal output device for outputting a pseudo pulse signal for inspecting the operation of a control device that controls based on an input pulse signal. Regarding the device.

[0002]

2. Description of the Related Art Various control devices, such as an electronically controlled fuel injection device for an internal combustion engine, use a control unit (ECU) built in a microcomputer to input various sensor signals and various data that the ECU has in accordance with a program. The calculation is performed on the basis of the above, and the output control (injection control) of the fuel injection pulse to the fuel injection valve is performed and the ignition pulse control (ignition control) in the spark plug is performed.

Although the ECU operates according to the program as described above, when the program is newly developed, it is necessary to check whether the ECU operates without fail according to the specifications. In debugging such a program, in order to realize the same state as when an actual sensor is connected to the ECU, normally, the signals simulating various sensors from the inspection device are changed according to the control specifications. It is common to output and check whether a signal such as a control signal corresponding to the simulated signal is output from the ECU.

[0004]

By the way, due to the need for higher-performance vehicle control and more sophisticated vehicle safety measures, not only conventional injection control and ignition control but also vehicle abnormality such as misfire of an internal combustion engine. The ECU has also been required to perform control to drive the vehicle as safely as possible in the state.

However, for this control, a more complicated abnormal state of the internal combustion engine is detected and controlled.
In the current inspection device, only the sensor output is simply simulated, and there is no inspection device that simulates an abnormal state of the vehicle such as a misfire of the internal combustion engine, making it difficult to verify the control of the developed program. Was becoming.

An object of the present invention is to solve such a problem, realize a pseudo pulse signal output device capable of outputting a pulse pattern of a complicated sensor signal, and facilitate verification of control of a developed program. To do.

[0007]

Means for Solving the Problems and Effects of the Invention
The described invention is a pseudo pulse signal output device for outputting a pseudo pulse signal for inspecting the operation of a control device which controls based on an input pulse signal, and is a combination of pulses of at least two kinds of frequencies. It is a pseudo pulse signal output device characterized by repeatedly outputting a pulse signal.

According to a second aspect of the present invention, at least one of the plurality of pulse generating means has a pulse frequency different from that of the other pulse generating means, and the pulse signals from the plurality of pulse generating means are repeatedly selected in a predetermined order. 2. The pseudo pulse signal output device according to claim 1, further comprising a selection output unit for outputting.

According to a third aspect of the present invention, a plurality of pulse generating means having variable pulse frequencies, and a selective output means for repeatedly selecting and outputting the pulse signals from the plurality of pulse generating means in a predetermined order. The pseudo pulse signal output device according to claim 1, further comprising:

The invention according to claim 4 further comprises pulse counting means for counting the number of pulses of the pulse signal output by the selection output means, and the selection output means counts a predetermined number of pulses by the counting means. Every time
4. The pseudo pulse signal output device according to claim 2, wherein the pulse generating means is repeatedly selected in a predetermined order.

According to a fifth aspect of the present invention, there is further provided low frequency conversion means for converting the pulse signal output from the selective output means into a frequency lower than the pulse signal and outputting the converted frequency. Item 4. The pseudo pulse signal output device according to any one of Items 2 to 4.

According to a sixth aspect of the present invention, the control device comprises:
It is a control device for a vehicle equipped with an internal combustion engine, and the pseudo pulse signal to be output is a pseudo signal representing a pulse signal of an internal combustion engine speed sensor at the time of misfire of the internal combustion engine. The pseudo pulse signal output device according to any one of 5 above.

The pseudo pulse signal output device according to the present invention is characterized in that it repeatedly outputs a pulse signal in which pulses of at least two kinds of frequencies are combined. Therefore, it is possible to simulate a complicated output pattern of a sensor that outputs a pulse signal at the time of abnormality, and it becomes easy to verify the control of the program corresponding to the time of abnormality.

More specifically, in this pseudo pulse signal output device, at least one of the plurality of pulse generating means has a pulse frequency different from that of the other, and the pulse signals from the plurality of pulse generating means are predetermined. Selective output means for repeatedly selecting and outputting in sequence. In this case, depending on the pulse pattern you want to achieve,
It is possible to output a pulse signal having a desired pattern by combining pulse generating means having different pulse frequencies and by selectively selecting and outputting the pulse signals from each pulse generating means in a predetermined order by the selective output means. .

Further, the pseudo pulse signal output device is such that a plurality of pulse generating means having variable pulse frequencies and a selective output for repeatedly selecting and outputting the pulse signals from the plurality of pulse generating means in a predetermined order. Means, and in this case, by changing the individual pulse frequencies of the pulse generating means from the outside and causing the selective output means to order these pulse generating means appropriately, the pulse signal from the pulse generating means By repeatedly selecting and outputting in that order, a pulse signal having a desired pattern can be output.

Further, it comprises pulse counting means for counting the number of pulses of the pulse signal outputted by the selective output means, and the pulse generating means generates the pulse every time the selective output means counts a predetermined number of pulses. The means may be repeatedly selected in a predetermined order. For example, in a rotation speed sensor of an internal combustion engine, misfiring of each cylinder affects fluctuations in the rotation speed of the internal combustion engine, but the torque generated by each cylinder corresponds to the top dead center (expansion stroke) of each cylinder. , The top dead center thereof (expansion stroke) can be represented by a constant number of pulses.

Therefore, if the pulse generating means is switched so that the predetermined pulse number is counted with the pulse number between the top dead centers as the predetermined pulse number, the rotating state of the internal combustion engine can be simulated. If a pulse generator with a frequency corresponding to the number of revolutions at the time of misfire is included in the plurality of pulse generators, a pseudo pulse signal that simulates the misfire state of the cylinder corresponding to the pulse generator is output. Can be made.

As the pulse generating means, when the frequency of the pulse of the actual sensor is largely different from that of the actual sensor, the pulse of the actual sensor often has a lower frequency, and in that case, the pseudo pulse signal is generated. If the output device further comprises a low frequency conversion means for converting the pulse signal output by the selection output means to a frequency lower than the pulse signal and outputting the converted pulse signal, the pulse signal of the actually required frequency is converted. Can be output.

[0019]

1 is a block diagram of an inspection apparatus 2 to which a pseudo pulse signal output apparatus of the present invention is applied. The inspection device 2 includes a pseudo pulse signal output unit 4, a signal generator 6, a measurement signal processing unit 8 and an ECU interface unit 10.

The pseudo pulse signal output unit 4 is configured as an example of a pseudo pulse signal output device and is a device for outputting a crank angle pulse signal of the internal combustion engine as a pseudo pulse signal. The decoder 12 has 12 clocks. Generator 14, 16, 18, 20, 22, 24, 26, 2
8, 30, 32, 34, 36, a pulse synthesizing section 38, a cylinder discrimination pattern memory circuit 40, and a pulse frequency conversion pattern memory circuit 42.

The decoder 12 is a host computer 43.
The command signal from is analyzed, and it is set for each of the clock generators 14 to 36 that the generated pulse frequency is variable whether or not to generate the pulse signal of any frequency. Further, the decoder 12 sets the timing of which of the clock generators 14 to 36 the pulse signal is to be output to the cylinder discrimination pattern memory circuit 40.

The clock generators 14 to 36 generate pulses whose frequency is adjusted according to the setting made by the decoder 12. The pulse synthesizer 38 includes AND circuits 46, 48 corresponding to the clock generators 14 to 36.
50, 52, 54, 56, 58, 60, 62, 64, 6
6, 68 and an OR circuit 70 for outputting the OR logic of the inputs from the AND circuits 46 to 68. Each of the AND circuits 46 to 68 outputs the AND logic of the inputs from the corresponding clock generators 14 to 36 and the cylinder discrimination pattern memory circuit 40.

The cylinder discrimination pattern memory circuit 40 counts the pulses output from the pulse synthesizing section 38 to determine the timing, and the AND circuits 46 to 6 corresponding to one clock generator 14 to 36 at the output timing.
By outputting a high level signal to 8, the pulse signals from the corresponding clock generators 14 to 36 are sent to the pulse frequency conversion pattern memory circuit 42 via the OR circuit 70.

Pattern memory circuit 42 for pulse frequency conversion
Then, every time a predetermined number of pulses from the clock generators 14 to 36 are counted, the output signal is switched between the high level and the low level to form a pulse signal of a frequency corresponding to the crank angle sensor, and the ECU interface unit 10 Is transmitted to the external ECU 44 as a pseudo crank angle pulse signal.

The signal generator 6 outputs a pulse signal or an analog signal such as a vehicle speed sensor signal, a cooling water temperature sensor signal of an internal combustion engine, an on / off signal of an air conditioner switch, or the like according to a setting signal from the host computer 43.
External ECU 4 via CU interface unit 10
4 is a device for outputting as a pseudo signal.

The measurement signal processing unit 8 takes in signals such as control signals output from the external ECU 44 through the ECU interface unit 10 and converts them into digital data which can be discriminated by the host computer 43. . Next, the ECU inspection processing executed by the host computer 43, particularly the setting processing for the decoder 12 and the operation of the pseudo pulse signal output unit 4 based on this setting will be described.

FIG. 2 shows a flowchart of the ECU inspection processing executed by the host computer 43. When the process is started, the number of cylinders for simulation is set (S100). Here, the number of cylinders is input to the host computer 43 by a person, or the number of cylinders data already set in the storage medium is read into the working memory of the host computer 43. For example, for 6 cylinders, "6" is set.

Next, the crank angle sensor output value (rotation speed)
Is set (S110). This is also performed in the same manner as the setting of the number of cylinders in step S100. For example, if the internal combustion engine speed is simulated at 1000 rpm, "1000" is set.

Next, the variation rate is set for each cylinder (S1).
20). This variation rate is a variation rate with respect to the crank angle sensor output value (rotational speed). For example, when the crank angle sensor pulse signal indicating that the third and fourth cylinders are misfiring is formed, the variation rate of the first cylinder is changed. Rate = 0%, second cylinder variation = 0%, third cylinder variation = -5%, fourth cylinder variation = -8%, fifth cylinder variation = -3%, sixth The variation rate of the cylinder is set to 0%.

Further, the outputs of other sensors are also set (S130). For example, vehicle speed = 80 km / h, cooling water temperature of the internal combustion engine = 80 ° C., air conditioner switch = on, etc. are set. In this way, when the necessary settings are made, the setting data is confirmed and the confirmed setting contents are transferred to the inspection device 2 (S140). In determining the setting data, the crank angle sensor output value for each cylinder is obtained from the crank angle sensor output value based on the variation rate, and the output value is further converted into the pulse frequency output from the clock generators 14 to 36. In addition, processing such as vehicle speed, cooling water temperature of the internal combustion engine, turning on / off of the air conditioner switch, and the like are converted into values for setting the signal generator 6.

The crank angle sensor output set value of each cylinder thus determined is incorporated into a command command and sent to the decoder 12. Similarly, the setting values of other sensors are also incorporated into the command command and sent to the signal generator 6. After that, on the host computer 43 side, the ECU that receives the pseudo signal output from the inspection device 2
A measurement process (S150) is performed in which a signal such as a control signal output by the calculation process 44 based on the pseudo signal is received from the measurement signal processing unit 8 of the inspection apparatus 2 and recorded / analyzed.

The decoder 12, which has received the command including the pulse frequency in step S140, interprets the command, and here, the clock generator 1 for the first cylinder is used.
4, the pulse frequency corresponding to each of the second cylinder clock generator 16, the third cylinder clock generator 18, the fourth cylinder clock generator 20, the fifth cylinder clock generator 22, and the sixth cylinder clock generator 24 is set. To do. Also, the decoder 12
Is a pattern memory circuit for cylinder discrimination 4 based on the command.
Also for 0, every time the output pulse of the OR circuit 70 is counted by a predetermined number (for example, 2400 pulses), the first to sixth
The AND circuits 46 to 56 for the cylinder clock generators 14 to 24 are sequentially and repeatedly set to output a high level signal.

As a result, as shown in the timing chart of FIG. 3A, the pulse signals of the frequencies corresponding to the respective crank angle sensor output set values are output from the clock generators 14 to 24 for the first to sixth cylinders. Is output. In the example described above, the variation rate of the first cylinder = 0%, the variation rate of the second cylinder = 0%, the variation rate of the third cylinder = −5%, the variation rate of the fourth cylinder = −8%, the fifth cylinder. Fluctuation rate of -3%, 6th
Since the fluctuation rate of the cylinders is set to 0%, the frequency for the first cylinder clock generator 14 corresponds to 1000 rpm, and the frequency for the second cylinder clock generator 16 corresponds to 1000 rpm for the third cylinder. 1000 rpm x (1-
0.05) = 950 rpm at a frequency corresponding to 1000 rpm from the fourth cylinder clock generator 20.
(1-0.08) = at a frequency corresponding to 920 rpm,
1000r from the clock generator 22 for the fifth cylinder
At a frequency corresponding to pm × (1-0.03) = 970 rpm, 10th from the sixth cylinder clock generator 24.
A pulse signal is output at a frequency corresponding to 00 rpm.

The cylinder discrimination pattern memory circuit 40 first outputs a high level signal to the AND circuit 46 as a gate circuit of the first cylinder clock generator 14, and outputs a low level signal to the other AND circuits 48 to 68. Since it is output, the pulse signal from the first cylinder clock generator 14 is output to the pulse frequency conversion pattern memory circuit 42 via the AND circuit 46 and the OR circuit 70. Further, the pulse signal from the first cylinder clock generator 14 is also output to the cylinder discrimination pattern memory circuit 40, and the cylinder discrimination pattern memory circuit 40 counts this pulse. Every time the count value becomes "2400", the count value is cleared and counting is started from the beginning, and the high level signal to the AND circuit 46 for the first cylinder clock generator 14 is set to the low level, and the second The low level signal to the AND circuit 48 for the cylinder clock generator 16 is set to the high level. Accordingly, next, the pulse signal of the second cylinder clock generator 16 is output from the AND circuit 48 and the OR circuit 70 to the pulse frequency conversion pattern memory circuit 42 and the cylinder discrimination pattern memory circuit 40.

After that, every time the cylinder discrimination pattern memory circuit 40 counts 2400, a high level signal is sequentially output and the AND circuits 46 to 56 are sequentially switched as shown in FIG. The pulse signal is sequentially output from the clock generator 14 to the sixth cylinder clock generator 24 to the pulse frequency conversion pattern memory circuit 42 and the cylinder discrimination pattern memory circuit 40.

Therefore, the pulse signal output from the OR circuit 70 is, as shown in FIG. 3C, the pulse signal from the first cylinder clock generator 14 to the sixth cylinder clock generator 24, which is a pseudo internal combustion engine. The pulse signals are sequentially synthesized according to the rotation of.

Pattern memory circuit 42 for pulse frequency conversion
Since the pulse frequency of the cylinder clock generators 14 to 36 is set to 600 times the pulse frequency output from the actual crank angle sensor, the pulse output from the OR circuit 70 is output every 300 times. By inverting the signal level, the frequency is reduced to 1/60
0 to form an appropriate pseudo crank angle sensor pulse signal shown in FIG.
It outputs to ECU44 via 0. This pseudo crank angle sensor pulse signal shows the fluctuation of the rotation speed as shown in FIG.

The ECU 44, which has received the pseudo crank angle sensor pulse signal and the pseudo signal of the other sensor from the signal generator 6, carries out an arithmetic operation by a program process based on the signal state, and the internal combustion engine or It outputs signals such as control signals for controlling each part of the vehicle.

In the inspection device 2, the control signal and other signals are received via the ECU interface unit 10 and converted into digital data which can be discriminated by the host computer 43 in the measurement signal processing unit 8. In the measurement processing (S150) shown in FIG. 2, this digital data is read from the measurement signal processing unit 8 and recorded / analyzed. When the measurement process (S150) is completed, it is determined whether or not to reset (S160), and if it is determined to be reset by human input or data stored in the storage medium in advance, the process proceeds to step S110. Return and set the rotation speed again (S11
0), the variation rate setting for each cylinder (S120), and the output setting for other sensors (S130) are performed, and the above-described processing is executed based on the pseudo signals in different states to obtain measurement data.

If the resetting is not necessary in step S160, the ECU inspection process ends. Since the present inspection device 2 is configured as described above, it is possible to simulate a complicated pulse output pattern of the crank angle sensor at the time of an abnormal condition, here, at the time of misfire, and to control a program that performs processing corresponding to the misfire. It becomes easy to verify.

In the above example, by lowering the frequency of the output pulse of the clock generators 18 to 22 for the third to fifth cylinders, a pseudo specific cylinder of the internal combustion engine, here, the third cylinder is used. Although the misfire of the fourth cylinder is simulated, the misfire does not always occur in a fixed cylinder. Therefore, in order to simulate the case where the misfire occurs in such an indefinite cylinder, the inspection device 2 During operation, by sending a command from the host computer 43 to the decoder 12, the fluctuation rate of each cylinder may be changed with the passage of time or the rotation of the internal combustion engine.

Further, the frequency of the state in which there is fluctuation and the state in which there is no fluctuation is set in the host computer 43, and the host computer 43 periodically or randomly using random numbers according to the frequency. Decoder 12
By outputting the setting in which the fluctuation exists and the setting in which the fluctuation does not exist, a state in which a misfire sometimes occurs may be simulated. For example, the pseudo pulse signal whose frequency fluctuates due to misfire as described above is EC three times in 15 rotations.
It outputs to U44, and the other 12 times, the fluctuation rate of all cylinders = 0%, and the pseudo pulse signal of a constant frequency for all cylinders is sent to the ECU44.
May be output.

Further, in the above-mentioned example, the pseudo pulse signal of the crank angle sensor due to the misfire is created. However, for example, the fluctuation of the rotational speed due to the fluctuation of the load on the internal combustion engine such as the air conditioner on / off, or the load thereof. The host computer 43 may output a pseudo signal such as an increase in the number of revolutions due to the increase in the number of revolutions of the internal combustion engine, which is performed by the host computer 43 in accordance with a lapse of time or the revolution of the internal combustion engine in a predetermined pattern. It can be easily realized by decreasing or increasing the generated pulse frequencies of ~ 36. Fluctuations in the frequency of the pulse signal are detected in
It is also possible to configure the decoder 12 so that the host computer 43 can do it, and the host computer 43 does not switch the crank angle sensor output value or the variation rate with respect to the decoder 12 during the measurement process (S150).

In the above example, since the internal combustion engine has 6 cylinders, only the clock generators 14 to 24 of the clock generators 14 to 36 generate pulse signals. The generators 14 to 36 are used to form a pseudo crank angle pulse signal.

The cylinder clock generators 14 to 3
Reference numeral 6 corresponds to pulse generation means, the cylinder discrimination pattern memory circuit 40 corresponds to pulse counting means and selection output means, and the pulse frequency conversion pattern memory circuit 42 corresponds to low frequency conversion means. [Others] Although the decoder 12 was constructed as a digital circuit by hardware logic,
It may be processed by software logic using PU.

The clock generator 14 for each cylinder is also provided.
Although the pulse frequencies of 36 to 36 are variable, the clock generators 14 to 36 may have fixed pulse frequencies if they are used as dedicated inspection devices that output only specific rotation speed fluctuations. A clock generator having a fixed pulse frequency may be used in combination so as to correspond to the pattern of rotation speed fluctuation.

[Brief description of drawings]

FIG. 1 is a block diagram of an inspection device to which a pseudo pulse signal output device of the present invention is applied.

FIG. 2 is a flowchart of an ECU inspection process executed by a host computer.

FIG. 3 is a timing chart showing a combined output process of pulse signals.

[Explanation of symbols]

2 ... Inspection device 4 ... Pseudo pulse signal output unit 6 ... Signal generator 8 ... Measurement signal processing unit 10 ... ECU interface unit 12 ... Decoder 14, 16, 18, 20, 22, 24, 26, 28, 3
0, 32, 34, 36 ... Clock generator 38 ... Pulse synthesizer 40 ... Cylinder discrimination pattern memory circuit 42 ... Pulse frequency conversion pattern memory circuit 43 ...
Host computer 44 ... ECU 46, 48, 50, 52, 54, 56, 58, 60, 6
2, 64, 66, 68 ... AND circuit 70 ... OR circuit

Claims (6)

[Claims] 1. A pseudo pulse signal output device for outputting a pseudo pulse signal for inspecting the operation of a control device for controlling based on an input pulse signal, comprising a combination of pulses of at least two kinds of frequencies. A pseudo pulse signal output device that repeatedly outputs a pulse signal. 2. At least one of a plurality of pulse generating means having a pulse frequency different from that of the other, and a selection output means for repeatedly selecting and outputting the pulse signals from the plurality of pulse generating means in a predetermined order. The pseudo pulse signal output device according to claim 1, further comprising: 3. A plurality of pulse generation means having variable pulse frequencies, and a selection output means for repeatedly selecting and outputting pulse signals from the plurality of pulse generation means in a predetermined order. The pseudo pulse signal output device according to claim 1, which is characterized in that. 4. Further comprising pulse counting means for counting the number of pulses of the pulse signal output by the selective output means, wherein the selective output means each time the predetermined pulse number is counted by the counting means. 4. The pseudo pulse signal output device according to claim 2, wherein the pulse generating means is repeatedly selected in a predetermined order. 5. A low frequency conversion means for converting the pulse signal output from the selective output means into a frequency lower than the pulse signal and outputting the converted low frequency signal. Or a pseudo pulse signal output device as described above. 6. The control device is a control device for an automobile equipped with an internal combustion engine, and the pseudo pulse signal to be output pseudo represents a pulse signal of an internal combustion engine speed sensor at the time of misfire of the internal combustion engine. It exists, It is characterized by the above-mentioned.
The pseudo pulse signal output device according to any one of 1.