JPH08153052A - Data communication equipment - Google Patents

Abstract

PURPOSE: To provide a data communication equipment without the fear of malfunction caused by noise and without the problem of a waiting time even though an expensive input port terminal is not provided. CONSTITUTION: At the time of A/D conversion processing, an internal-combustion engine control circuit being the data communication equipment starts-up interruption processing based on the edge of a trigger signal to transmit a transmission order to input IC and to receive A/D conversion data (step 62). At the time of reading simple port data, the circuit transmits the transmission order after passing a specified time from processing order(step 63 and 64) and receives port data from input IC (step 64). Thus, even though an inexpensive input port circuit is used,the internal-combustion engine control circuit does not make malfunction owing to noise. Besides, waiting time for receiving port data can satisfactorily be shortened and there is no influence on the responsiveness of control. In addition, A/D conversion data is also received by interruption processing so that unnecessary waiting time is not generated and control is not affected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data communication device, and more particularly to a data communication device after transmitting a processing command to a data processing device having a difference in edge interval of a trigger signal which changes before and after the processing depending on the type of processing. , A data communication device for receiving a processing result from the data processing device.

[0002]

2. Description of the Related Art An A / D converter for converting an analog signal from a plurality of sensors into a digital signal, or an input interface circuit having an input buffer circuit for inputting ON / OFF signals from a plurality of switches is provided. Known (JP-A-57-109003, JP-A-58-58)
200054, JP-A-60-41122,
JP-A-63-164639).

These input interface circuits are
After reading data from the A / D converter or the input buffer circuit according to a command from the outside, for example, a computer for controlling the internal combustion engine, a change in the trigger signal for interrupt, for example, a rising edge As a result, an interrupt is generated in the internal combustion engine control computer, and a data transmission command is output to the input interface circuit. The input interface circuit receives the transmission command and transmits the data read from the A / D converter or the input buffer circuit.

As a result, even if the number of input ports on the computer side is small, it is possible to obtain data from a large number of sensors and switches, and if the computer is for controlling the internal combustion engine, various types of operation of the internal combustion engine are possible. The conditions can be known in detail, and highly accurate control can be performed.

[0005]

However, in the case of the input interface circuit having the A / D converter and the input buffer circuit as described above, there are the following problems to be solved. That is, the computer
When analog data such as the internal combustion engine temperature that cannot be obtained by the D converter is requested to the input interface circuit, first, A
A processing signal indicating that data of any channel of the / D converter can be read is transmitted to the input interface circuit. In response to this, the input interface circuit
Immediately, the trigger signal is lowered and A / D conversion processing is performed. When the A / D conversion process is completed and the internal combustion engine temperature data can be transmitted, the input interface circuit
Raise the trigger signal. Due to the edge at the time of rising of this trigger signal, an interrupt is applied to the computer side, a transmission command is transmitted to the input interface circuit,
Send internal combustion engine temperature data. The computer reads the transmitted internal combustion engine temperature data, stores the internal combustion engine temperature data, and uses it for arithmetic processing and the like.

When the computer requests the input interface circuit for data such as on / off of the idle switch obtained in the input buffer circuit, the input interface circuit first asks which channel of the input buffer circuit. The processed signal meaning that the data of (1) is read is transmitted to the input interface circuit.
In response to this, the input interface circuit immediately lowers the trigger signal and performs the reading process from the input buffer circuit. If this read operation is completed and the idle switch on / off data can be transmitted,
The input interface circuit raises the trigger signal. Due to the rising edge of this trigger signal, the computer side is interrupted, and a send command is sent to the input interface circuit to turn on / off the idle switch.
It is used to read off data, store the on / off data, and for arithmetic processing.

However, compared with the A / D conversion process, the process of reading from the input buffer circuit is completed in an extremely short time. Therefore, when data is obtained by A / D conversion, the time from the falling edge to the rising edge of the trigger signal is long, that is, the edge interval is long, but when reading from the input buffer circuit, from the falling edge of the trigger signal. The time to rise is extremely short.

Therefore, the change in the trigger signal output when reading from the input buffer circuit is very similar to the change due to noise, and there is a risk that noise will cause an interrupt. Therefore, normally, in order to prevent the interrupt processing from being executed by noise, a special input port circuit is provided on the computer side to distinguish the noise from the actual trigger signal change. There is a problem that the port circuit is expensive.

It is also conceivable that the computer waits for a predetermined time after transmitting the processing command without executing the interrupt processing. However, in this case, especially in A / D conversion, A
The computer is always kept waiting for a sufficient time until it can be estimated that the / D conversion processing is completed, which may reduce the responsiveness and affect the overall control processing.

The present invention provides a data communication device which receives no data from the above-mentioned data processing device, does not have a risk of malfunction due to noise, and has no problem of waiting time, even without providing an expensive input port circuit. The purpose is to do.

[0011]

According to the first aspect of the present invention,
As illustrated by a solid line in FIG. 6, the processing result is received from the data processing apparatus after the processing command is transmitted to the data processing apparatus in which the edge interval of the trigger signal that changes before and after the processing differs depending on the type of processing. In the case of the data communication device, the processing command is received for a relatively long processing time, the processing result of the data processing device is received at a timing based on the edge of the trigger signal after the processing is completed, and the processing command is received. In the case of a relatively short processing time, the data communication device is provided with a reception timing selection means for receiving the processing result of the data processing device at a timing based on the passage of time from the processing command. is there.

According to a second aspect of the present invention, as illustrated by a dotted line in FIG. 6, the data processing device converts an analog signal from one or more sensors into a digital signal.
A / D conversion means, input means for inputting an ON / OFF signal from one or more switches, and output of data from either the A / D conversion means or the input means according to a processing command received from the outside. Data reading means for reading, trigger signal output means for raising or lowering the trigger signal after receiving the processing instruction and raising or lowering the trigger signal after completion of processing of the processing instruction, and read by the data reading means. 2. The data communication device according to claim 1, further comprising a data transmitting unit that transmits the data to the outside at a reception timing of a transmission command from the outside.

According to a third aspect of the present invention, when the content of the processing instruction is the instruction for causing the reception timing selecting means to transmit the data from the A / D converting means, the processing of the data processing device is performed. When the result is received at the timing based on the edge of the trigger signal after the processing is completed, and the content of the processing instruction is an instruction to transmit the data from the input means, the processing result of the data processing device is processed as described above. 3. The data communication device according to claim 2, wherein the data communication device receives at a timing based on the passage of time from the command.

According to a fourth aspect of the present invention, the processing instruction is
4. The data communication device according to claim 2, which also serves as the transmission command. In the invention according to claim 5, the sensor and the switch detect the operating condition of the internal combustion engine and receive the operating condition data to execute the control of the internal combustion engine. Data communication device.

[0015]

In the data communication apparatus according to the first aspect of the present invention, when the reception timing selection means has a relatively long processing time for processing by the processing command, the processing result of the data processing apparatus after processing is completed is completed. When the processing by the processing command has a relatively short processing time, the processing result of the data processing device is received at the timing based on the time lapse from the processing command.

Therefore, even if the trigger signal is short and the normal input port circuit of the data communication device cannot distinguish the rising and falling of the trigger signal from the noise, such a trigger signal change with a short edge interval is generated. After sending the processing instruction that causes the data to be processed, do not wait for the edge of the processing completion trigger signal, ignore such edge, just wait for a while, and then let the data processing device send the data. There is. Therefore, the data communication device
Even with an inexpensive input port circuit, it is possible to input various types of data more than the number of ports of the data communication device and use them for control without malfunctioning due to noise.

Also, since the waiting time is set when the processing time is short, even if the end of the processing is estimated to the maximum, it is sufficient compared with the case where the waiting time is estimated and set when the processing time is long. It is short and does not affect the responsiveness of controls that use this data. Further, if the processing time is long, since it is received at the timing based on the edge of the trigger signal after the processing is completed, unnecessary waiting time does not occur,
In this case also, there is no influence on the processing that uses this data.

More specifically, the data processing device may have the following configuration. That is,
A / D conversion means for converting an analog signal from a single or a plurality of sensors into a digital signal, input means for inputting an on / off signal from a single or a plurality of switches, and the above-mentioned A according to a processing instruction received from the outside. A data reading means for outputting and reading data from either the D / D conversion means or the input means; and a trigger signal falling or rising after the processing instruction is received, and a trigger signal rising after the processing of the processing instruction is completed or It has a trigger signal output means for terminating and a data transmission means for transmitting the data read by the data reading means to the outside at the reception timing of a transmission command from the outside. In this case, the process of outputting and reading the data from the A / D conversion means corresponds to the process of relatively long processing time,
The process of outputting and reading the data from the input means corresponds to the process of relatively short processing time.

Therefore, in this case, for example, in the reception timing selection means, the content of the processing instruction is the A / D.
When the instruction to transmit the data from the conversion means receives the processing result of the data processing device at the timing based on the edge of the trigger signal after the processing is completed, the content of the processing instruction transmits the data from the input means. If it is the instruction to cause the processing instruction, the processing result of the data processing device is received at a timing based on the lapse of time from the processing instruction.

The processing instruction may also serve as the transmission instruction. When the data communication device is used for internal combustion engine control, the sensor and the switch are
When the operating condition of the internal combustion engine is detected and the operating condition data is received, the data communication device controls the internal combustion engine. As a result, even in an internal combustion engine control circuit, even in an inexpensive input port circuit, without causing malfunction due to noise, by inputting various types of internal combustion engine operating condition data equal to or more than the number of ports of the internal combustion engine control circuit, It can be used for control. If the processing time is short, the waiting time is
Since it is set when reading off data, even if the end of the process is estimated to the maximum, it is sufficiently short compared to setting the waiting time when the processing time is long, which affects control responsiveness. do not do. If the processing time is further longer, for example, when reading analog data with A / D conversion such as internal combustion engine temperature, since it is received at the timing based on the edge of the trigger signal after the processing is completed, unnecessary waiting time does not occur. Therefore, there is no problem in responsiveness and the control of the internal combustion engine is not affected.

[0021]

FIG. 1 shows an internal combustion engine controller 2 as an embodiment of the present invention. The internal combustion engine control device 2 includes an internal combustion engine control circuit 4, an input IC 6, a pulse input circuit 8 and an output circuit 10.

The internal combustion engine control circuit 4 includes a CPU, a ROM,
A RAM, I / O, bus line, etc. constitute a computer, and various sensors 12, 14 and switches 16 are provided.
The operating condition data of the internal combustion engine is detected from the above, arithmetic processing is performed, and the driving of the internal combustion engine is controlled by outputting the driving output to the plurality of drive devices 18 via the output circuit 10 according to the result of the arithmetic processing. There is. The analog sensor 12 and the switch 16 obtain data by serial communication via the input IC 6. The pulse sensor 14 obtains data via the pulse input circuit 8. The analog sensor 12 is, for example, a water temperature sensor that detects the temperature of the cooling water of the internal combustion engine, an intake air temperature sensor that detects the temperature of intake air, or the like. The pulse sensor 14 is, for example, a rotation speed sensor that detects the rotation speed of the internal combustion engine or a vehicle speed sensor that detects the speed of the vehicle. As the switch 16,
Examples include idle switches and starter switches. The drive device 18 is a fuel injection device, an ignition device, or the like.

In the serial communication, the internal combustion engine control circuit 4 and the input IC 6 mutually communicate with each other via the serial communication circuit 20 of the internal combustion engine control circuit 4 and the serial communication circuit 22 of the input IC 6. Running. The serial communication circuits 20 and 22 are connected to each other by a command signal line 24, a data signal line 26, a trigger signal line 28 and a clock signal line 30. This is because the clock signal input from the internal combustion engine control circuit 4 to the input IC 6 on the clock signal line 30 synchronizes the serial communication.

From the internal combustion engine control circuit 4, processing commands and transmission commands are transmitted as commands to the input IC 6 via the command signal line 24. For example, in order for the internal combustion engine control circuit 4 to obtain analog data from one of the analog sensors 12, the analog sensor 12 is used as a processing command.
If a command is generated by combining a channel number for selecting and a command for instructing A / D conversion and output to the command signal line 24, the input IC 6 receives the command via the serial communication circuit 22. , The contents are analyzed, the channel is instructed to the A / D converter 32 provided, and the A / D conversion is performed. The input IC 6 causes the trigger signal line 28 to fall during this reception.

When the processing of the A / D converter 32 is completed, A
The / D conversion data is set in the serial communication circuit 22. At this timing, the input IC 6 raises the trigger signal. The internal combustion engine control circuit 4 causes an interrupt due to the rise of the trigger signal, causes the serial communication circuit 22 of the input IC 6 to transmit the A / D conversion data, and receives the A / D conversion data.

Further, the internal combustion engine control circuit 4 has a switch 16
In order to obtain ON / OFF data (hereinafter also referred to as port data) from one of the above, as a processing instruction, a block number for selecting the switch 16 and reading from the input buffer circuit 34 provided in the input IC 6 are instructed. Command is generated in combination with the command to be generated and output to the command signal line 24. As a result, the input IC 6 receives the command via the serial communication circuit 22, analyzes the content, and reads the data from the corresponding block of the input buffer circuit 34. The input IC 6 lowers the trigger signal line 28 during this reception and raises it when the data is read from the input buffer circuit 34.

The internal combustion engine control circuit 4 serially communicates a trigger signal that changes from a fall to a rise (or a rise to a fall) at short intervals, as in the case of reading from the input buffer circuit 34. The filter circuit provided at the port of the circuit 20 removes the change in the trigger signal. Therefore, the internal combustion engine control circuit 4 receives the serial communication circuit 22 of the input IC 6 after a predetermined time regardless of the rising of the trigger signal.
The ON / OFF data set in the above is transmitted to the input IC 6, and the internal combustion engine control circuit 4 receives it.

In this way, the internal combustion engine control circuit 4 is
Since the detection data representing the operating condition of the internal combustion engine is obtained from the plurality of analog sensors 12 and the switch 16 via the input IC 6, the port for inputting the data in the internal combustion engine control circuit 4 is the analog sensor 12 and the switch 16. It is possible to obtain a large amount of data with a minimum number of ports only for communication with the input IC 6 without providing only the number.

Of these processes, a flowchart of the process on the internal combustion engine control circuit 4 side is shown in FIGS. FIG. 2 shows a 4 ms timer interrupt process, which is executed every 4 ms. When the process is started, the A / D conversion channel is calculated (step 50). For this channel, for example, in order to obtain the output values of all the analog sensors 12, a setting is made to sequentially instruct the channels corresponding to each analog sensor 12.

Next, an A / D conversion command (processing instruction:
Also serves as a transmission command. ) Is created according to a predetermined format (step 51). For example, if the command is represented by an 8-bit serial signal, the 0th bit to the 4th bit
It is assumed that bits up to the bit represent a channel number, and bits 5 to 7 represent an instruction to instruct the output from the A / D converter 32 side.

Next, this A / D conversion command is transmitted to the input IC 6 via the command signal line 24 (step 52). The processes up to this point correspond to times t0 to t1 in the timing chart of FIG. The input IC 6 receiving the command analyzes the content of the command and lowers the trigger signal. Then, from the serial communication circuit 22 to A
An instruction signal for A / D converting analog data from the channel described in the command and outputting the analog data is output to the / D converter 32.

The A / D conversion process requires a relatively long time. For example, assuming that the A / D conversion process actually takes 50 μs, this transmission command of the A / D conversion process result is executed by the interrupt process shown in FIG. 3 due to the rise of the trigger signal. Therefore, the internal combustion engine control circuit 4 immediately returns to another processing after the end of step 52, and
It is possible to proceed with other processing during μs.

When the input IC 6 completes the processing of the A / D converter 32 and the A / D converted value is input to the serial communication circuit 22, the input IC 6 immediately raises the trigger signal (time t2). Due to the rise of this trigger signal, the internal combustion engine control circuit 4 is interrupted and the processing of FIG. 3 is started. First, the port block of the input buffer circuit 34 of the input IC 6 is calculated (step 60). In this calculation process, for example, in order to obtain the on / off values of all the switches 16, the channels corresponding to the blocks of each switch 16 are set in order. For example, if there are 24 switches 16 and the content of each block is obtained by a signal of 8 bits, the state of each switch 16 can be represented by 1 bit, so all the switches 16 have 24 bits / 8 bits = Will be divided into 3 blocks,
These three blocks will be sequentially designated on the channel.

Next, a port command (processing command: also serving as a transmission command) is created according to a predetermined format (step 61). The format is the same as the A / D conversion command described above, and is composed of a 5-bit channel number and a 3-bit instruction for instructing the output from the input buffer circuit 34 side.

Next, this port command is transmitted to the input IC 6 via the command signal line 24 (step 62). For the input IC 6, the command of the processing instruction as described above also serves as the transmission instruction of the untransmitted data which has been processed and obtained the result, so in step 62, the command is sent to the step 52 at the same time as the transmission. Then, the process of receiving the untransmitted A / D conversion data obtained based on the A / D conversion command transmitted by the above process is started.

When the input IC 6 receives the port command, it immediately receives the A / D signal via the data signal line 26.
The conversion data is transmitted and the trigger signal is turned off (time t3). Since the reading of data from the input buffer circuit 34 by this port command is an extremely short process, the process is completed immediately and the input IC 6 raises the trigger signal at short intervals (time t4).

At this time, on the internal combustion engine control circuit 4 side, the change from the fall to the rise of the trigger signal from the trigger signal line 28 at such a short interval is removed by the filter circuit. Therefore, the rising of the trigger signal accompanying the command transmission for this port does not cause an interrupt.

After step 62, a waiting time sufficient for completing the processing on the input IC 6 side is made (step 6).
3). This time is extremely short because the process of reading the data from the input buffer circuit 34 is extremely short as described above.
Even a sufficient waiting time is actually short enough not to affect the responsiveness of the control to changes in the on / off signal of the switch 16. For example, about 2 μs is sufficient. The internal combustion engine control circuit 4 may perform other processing during this period.

Next, from the internal combustion engine control circuit 4, the input IC
In order to transmit the port data that should have been obtained from the switch 16 to the serial communication circuit 22, the command is transmitted to the switch 6, and the port data is received at the same time (step 64). This command is actually a non-process command command that does not require the input IC 6 to perform any processing.

The input IC 6 receives the non-process command command, transmits the port data, and causes the trigger signal to fall (time t5), but since no processing is performed, the trigger signal is immediately raised (time t6). ).
After receiving the port data in step 64, the internal combustion engine control circuit 4 performs a physical quantity conversion process based on the port data, a delay process for time adjustment, and the like (step 6).
5), the trigger signal interrupt processing is ended.

Thereafter, when the next cycle of 4 ms is reached, the processing of FIG. 2 is started and the above-mentioned processing is repeated. In the present embodiment, the internal combustion engine control circuit 4 is
In the case of A / D conversion processing that takes a relatively long time, the interrupt processing is activated based on the edge of the trigger signal after the processing is completed, and a transmission command is transmitted to the input IC 6 by the interrupt processing, In the case of receiving the A / D converted data from the input IC 6 and reading from the input buffer circuit 34 in which the processing by the above processing instruction takes a relatively short processing time, a transmission instruction is issued after a predetermined time has elapsed from the above processing instruction. Is transmitted to the input IC 6 and the port data is received from the input IC 6.

Therefore, when the interval between the edges of the trigger signal is short, the inexpensive input port circuit of the serial communication circuit 20 of the internal combustion engine control circuit 4 cannot distinguish the rising and falling edges of the trigger signal from noise. Although it is removed by the filter circuit, the internal combustion engine control circuit 4 simply waits for a time after transmitting the port data transmission command to the input IC 6 such that the trigger signal with a short edge interval is changed. After that, the data transmission command is transmitted to the input IC 6, the port data is transmitted, and the data is received.

For this reason, even if the serial communication circuit 20 of the internal combustion engine control circuit 4 uses an inexpensive input port circuit, it does not malfunction due to noise, and there are many types of internal combustion engine control circuit 4 or more. Data can be input and used for control. In addition, the waiting time is set when reading port data whose processing time is short. Therefore, even if the completion of the port data reading process is estimated to the maximum, the waiting time is set when the processing time is long. Is short enough compared to the case of estimating and setting, and does not affect the responsiveness of control. In the case of A / D conversion processing with a longer processing time, since it is received by the interrupt processing based on the edge of the trigger signal after the processing is completed,
There is no unnecessary waiting time, and in this case also control is not affected.

In this embodiment, the input IC 6 corresponds to a data processing device, and the internal combustion engine control circuit 4 corresponds to a data communication device. The A / D converter 32 corresponds to A / D conversion means, the input buffer circuit 34 corresponds to input means, and the serial communication circuit 22 corresponds to data reading means, trigger signal output means, and data transmitting means. The process of FIG. 3 corresponds to the process as the reception timing selection means.

[Others] Further, in order to perform A / D conversion for a plurality of channels every 4 ms, after the processing of FIG. 2, the interrupt processing of FIG. 5 is added at the rising edge of the trigger signal. It suffices to execute only the number of channels and execute the trigger signal interrupt process of FIG. 3 as the final trigger signal interrupt process. Note that steps 70 to 72 in FIG. 5 are the same processes as steps 50 to 52 in FIG.

Further, in order to read from the input buffer circuit 34 for a plurality of channels every 4 ms, the same processing as steps 60 to 63 in the trigger signal interrupt processing of FIG. It may be executed between 63 and step 64.

Every 4 ms, A for multiple channels
In order to perform A / D conversion and read from the input buffer circuit 34 for a plurality of channels, the case where A / D conversion is performed for a plurality of channels every 4 ms described above and 4 m
Input buffer circuit 34 for a plurality of channels for each s
You can combine the processing when reading from.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of an embodiment.

FIG. 2 is a flowchart of a timer interrupt process executed by an internal combustion engine control circuit.

FIG. 3 is a flowchart of a trigger signal interrupt process executed by the internal combustion engine control circuit.

FIG. 4 is a timing chart of the above processing.

FIG. 5 is a flowchart of a part of another example of the trigger signal interrupt processing executed by the internal combustion engine control circuit.

FIG. 6 is a structural example of the present invention.

[Explanation of symbols]

2 ... Internal combustion engine control device 4 ... Internal combustion engine control circuit 6 ... Input IC 8 ... Pulse input circuit 10 ... Output circuit 12 ... Analog sensor 14 ... Pulse sensor 16 ... Switch 18 ... Drive device 20, 22 ... Serial communication circuit 24 ... Command Signal line 26 ... Data signal line 28 ... Trigger signal line 30 ... Clock signal line 32 ... A / D converter 34 ... Input buffer circuit

Claims (5)

[Claims] 1. A data communication device for receiving a processing result from the data processing device after transmitting a processing command to a data processing device in which an edge interval of a trigger signal that changes before and after the processing differs depending on the type of processing. When the processing by the processing instruction has a relatively long processing time, the processing result of the data processing device is received at the timing based on the edge of the trigger signal after the processing is completed, and the processing by the processing instruction is compared. A data communication device comprising a reception timing selection means for receiving the processing result of the data processing device at a timing based on the passage of time from the processing command when the processing time is relatively short. 2. The data processing device comprises: A / D conversion means for converting an analog signal from one or a plurality of sensors into a digital signal; and input means for inputting an on / off signal from a single or a plurality of switches. A data reading means for outputting and reading data from either the A / D conversion means or the input means according to a processing instruction received from the outside, and a trigger signal falling or rising after receiving the processing instruction, Trigger signal output means for raising or falling the trigger signal after the processing of the instruction is completed, and data transmission means for transmitting the data read by the data reading means to the outside at the reception timing of the transmission instruction from the outside. The data communication device according to claim 1, comprising. 3. When the content of the processing instruction is an instruction for transmitting data from the A / D conversion means, the reception timing selection means outputs the processing result of the data processing device after the processing is completed. When the processing instruction is received at the timing based on the edge of the trigger signal and the content of the processing instruction is an instruction to transmit the data from the input means, the processing result of the data processing device is set to the time elapsed from the processing instruction. The data communication device according to claim 2, wherein the data communication device receives at a timing based on the above. 4. The data communication device according to claim 2, wherein the processing instruction also serves as the transmission instruction. 5. The data communication according to claim 2, wherein the sensor and the switch detect the operating condition of the internal combustion engine and receive the operating condition data to execute the control of the internal combustion engine. apparatus.