JPS6345917A - Data counting system for operating recording device - Google Patents

Abstract

PURPOSE:To read a count accurately through the addition of a simple circuit constitution by inputting a dummy pulse signal together with a pulse signal from a sensor, operating an exclusive OR, outputting it to a clock terminal of the count circuit and subtracting the dummy pulse signal from the count signal number. CONSTITUTION:Exclusive OR circuits 21, 22 take exclusive OR of a pulse signal of sensors S1, S2 inputted respectively and a dummy pulse signal inputted from a dummy pulse generating means 1 and the result is inputted to clock terminals CLK0, CLK1 of the count circuit 14. The write is applied by the count circuit 14 synchronously with the input clock and the count value just before is written in the memory. Simultaneously, a dummy pulse is inputted to the circuits 21, 22 from the decoder 31 by the means 1. Then the number of dummy pulse signals is subject to subtraction processing from the count by the data adjusting means, in this case, by the software, stored in the memory or outputted externally.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an improvement in a data counting system for an operation recording device having a counting circuit that inputs a pulse signal detected from a sensor and outputs a counted signal in synchronization with an input clock.

[Conventional technology]

In a count circuit that initializes (writes) the power count value of an input pulse signal in synchronization with the input clock, such as a counter such as the IN 8253, the count circuit that initializes (writes) the count value of the input pulse signal is The count value of the operation data that has been reset is not initialized (written) and remains, making it impossible to read the correct count number.

[Problems to be solved by the invention]

This invention was made in view of the above circumstances, and even if the operating machine stops, the previous count value can be initialized (written).
An object of the present invention is to provide a data counting system that can read out correct count numbers.

[Means to solve the problem]

In order to achieve the above object, the present invention includes a counting circuit 4 which inputs the pulse signal detected from the sensor S and outputs the counted number of signals in synchronization with the input clock, as shown in the functional block diagram of FIG. In the data counting system of the operation recording device 5, (a) a dummy pulse generating means 1 is provided which outputs a dummy pulse signal every time a count value is initialized (written) in the counting circuit 4; (b) a sensor. An exclusive OR circuit 2 is provided which inputs the above dummy pulse signal together with the pulse signal from S, calculates an exclusive OR, and outputs the result to the clock terminal of the count circuit 4. (C). A technical measure is taken in which a data adjustment means 3 is provided to subtract the dummy pulse signal from the number of signals.

[Operation] The pulse signal detected from the sensor S is input to the counting circuit 4 and counted. This count value is initialized in synchronization with the input clock,
Written to memory, etc. Simultaneously with this initialization (writing), a dummy pulse signal is output from the dummy pulse generating means 1. This dummy pulse signal is input to the exclusive OR circuit 2 together with the pulse signal from the sensor S, the exclusive OR is taken, and the result is input to the clock terminal of the count circuit 4. Further, the number of pulses corresponding to the dummy pulse signal is subtracted from the count value counted by the count circuit 4, and the accurate count number is stored in the memory. Therefore, even if the operating machine stops, the dummy pulse signal output together with the previous output signal is input to the count circuit 4 via the exclusive OR circuit, and the previous count value is stored in the memory in synchronization with this. It can be output.

【Example】

An embodiment in which the present invention is applied to a vehicle operation record system using an IC card will be described below with reference to the drawings. The block diagram shown in FIG. 1 shows the hardware configuration of this embodiment, in which a control section 10 consisting of an 8-bit CPU is connected to a
A second interface (PIO) 11 for connecting the keyboard 41 and the display 42, a first interface (PIO) 12 for connecting the card contactor 43 of the IC card, and an interface (SIO) for serial communication. 13, an interface 14 for connecting the vehicle speed sensor S1 and the tachometer S2 to measure the vehicle speed and engine speed, a FROM 15 used as a memory for operation recording software, etc., and a RAM 16 used as a backup memory or a memory for software.
, a real-time clock 17 that is back-amplified by the on-board battery, and a serial communication interface (C
TC) consists of 18. In the above configuration, the IN position 8253 serves as the interface 14 for measuring vehicle speed and engine rotation speed.
A counting circuit (counter) is used. A decoder 31 is connected to the count circuit 14 as shown in FIG. 3, and a dummy pulse signal is sent to each exclusive OR circuit 21 and 22 to be described later by a control signal from the dummy pulse generating means 1 of the control s10. It is outputting. This counting circuit 14 counts pulse signals input from the speed sensor S1 and the digital tachometer (engine speed detection sensor) S2 every 0.5 seconds, and further initializes (writes into memory). That is, the pulse signal detected by the speed sensor S1 is transmitted to the speed data manual photocoupler 5 and the amplifier 6.
The signal is input to one side of the first exclusive OR circuit 21 through the . A dummy pulse signal, which is controlled by the dummy pulse generation means 1 and is transmitted from the decoder 31 every time the count circuit 14 is initialized (written), is input to the other side of the first exclusive OR circuit 21. −〇− ru. Further, the pulse signal sent from the digital tachometer S2 is also input to one of the second exclusive OR circuits 22 through the photocoupler 7 and amplifier 8 for inputting engine rotation data. The other side of the second exclusive OR circuit 22 receives a dummy pulse signal which is controlled by the dummy pulse generating means 1 and transmitted from the decoder 31 every time the count circuit 14 is initialized (written) as described above. is input. Therefore, each exclusive OR circuit 21 and 22 calculates the exclusive OR of the input pulse signal from the sensor 5IS2 side and the dummy pulse signal input from the dummy pulse generating means 1, and calculates the exclusive OR of the input pulse signal from the sensor 5IS2 side and the dummy pulse signal input from the dummy pulse generating means 1. Input to clock terminals (CLKO, CLKI). This person's count circuit 1 is synchronized with Kakurosoku as mentioned above.
4, a write operation is performed, and the immediately preceding count value is written into the memory, and at the same time, the dummy pulse generation means 1 generates a dummy pulse from the decoder 31 to each exclusive OR circuit 21.
．． 22. With this configuration, even when the vehicle is stopped and the vehicle speed signal etc. do not change, the clock signal is generated and measurement can be performed. Therefore, in a count circuit that is not preset when there is no clock signal, the count value can be written in real time to the memory without the previous count value remaining. Since the count value written in this way includes the number of dummy pulse signals, it is necessary to subtract the number of dummy pulse signals when storing it as operation data. Therefore, the above processing is performed by the data adjustment means 3.
In this embodiment, software subtracts the number of dummy pulse signals from the count value and stores it in the memory 16 or outputs it to the outside. Further, in the present invention, by adopting the above configuration, a predetermined number of dummy pulses are generated from the dummy pulse generating means 1, and the count number is confirmed (the number of input dummy pulses and the count written by the count circuit 14). It is also possible to check whether the counting circuit is operating normally by determining whether the values match or not and monitoring 7). On the other hand, the count circuit 14 in this embodiment also controls the buzzer sound to the card contactor.
In the figure, 41 indicates a connection to a buzzer. The data counting system of the operation recording device of this invention includes:
It is not limited to the above embodiments, and can be used to record operating data of various operating machines, and can be used to record inputs from various sensors by exclusive ORing with dummy pulses and outputting them to clock terminals. It is possible to achieve similar effects by inputting the information into the , and is highly versatile.

【Effect of the invention】

As described above, according to the present invention, when using a counting circuit that inputs a pulse signal detected from a sensor and outputs the counted number of signals in synchronization with an input clock, the input signal from the sensor is Even if the value does not change, the count number can be read out accurately by adding a simple configuration. It is also useful to check the operation of the counting circuit.

[Brief explanation of the drawing]

Fig. 1 is a functional block diagram of the present invention, Fig. 2 is a block diagram showing the heart configuration of an IJ data recording system using an IC card according to an embodiment of the invention, and Fig. 3 is a data counting system. It is a circuit diagram. ■...Dummy pulse generation means 2...Exclusive OR circuit 3...Data adjustment means 4...Count circuit 5...Photocoupler 6...Amplifier 7... Photocoupler 8...Amplifier 10...Control unit 14...Count circuit 21...First exclusive OR circuit 22...Second exclusive OR circuit 31...Decoder Sl. ...Speed sensor S2...Digital tachometer

Claims (1)

[Claims] (1) In a data counting system of an operation recording device that has a counting circuit that inputs a pulse signal detected from a sensor and outputs the counted number of signals in synchronization with the input clock, the signal counted by the counting circuit is initialized. dummy pulse generating means that outputs a dummy pulse signal every time (write); A data counting system for an operation recording device, comprising an OR circuit and a data adjustment means for subtracting a dummy pulse signal from the number of signals counted by the counting circuit.