JPH01196688A - Car type data processor - Google Patents

Abstract

PURPOSE:To prevent the reading error of car type information by writing special data from a CPU at the time of the initial rise of a device, reading special data written at the time of the power failure recovery, collating them with the writing data and when the data are coincident, executing the car type information processing by the CPU. CONSTITUTION:A condition collating circuit 10 operated with a voltage a little lower than the voltage from an no-break power source 5 supplied to car type information counters 2a-2j is provided, the special data is written from a CPU to the storing part of the circuit at the time of the initial rise of the device, the written data in read and collated with the written data at the initial rise in the CPU. At the time of the coincidence, the data to invert a polarity at the time of the initial rise is written into the storing part of a condition collating circuit 10, it is checked whether or not the written data is correctly read, and it is decided that the accumulated adding value at the time of the power failure recovery of the counters 2a-2j is normal when the data is normally read. Thus, the CPU can read the correct number of the vehicles classified by the car type to pass through at the time of the power failure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle type data processing device applied to a toll collection system of a toll road or the like, and particularly relates to an improvement of vehicle type information storage means during a power outage.

[Conventional technology]

Generally, in toll collection systems for toll roads, etc., a vehicle type signal and forward/reverse signals output from a vehicle type discrimination device that automatically determines the type of passing vehicle are received, and the signal is sent by a microprocessor (hereinafter referred to as CPU). A vehicle type data processing device is used to perform the processing. The vehicle type information processed by this vehicle type data processing device is important information for auditing in the toll collection system.

Therefore, even if the CPU is unable to process vehicle type information such as during a power outage, the vehicle type identification device and the interface for the vehicle type identification device will operate without power outage, and the vehicle type information received up to that point will be transferred after the power is restored. It is something that will be remembered until now.

FIG. 3 is a diagram showing this type of conventional vehicle type information storage means. This circuit operates as follows.

Car type information (car types A to E,
When the forward/forward/reverse lost strobe is input to the vehicle type interface circuit 1 built in the vehicle type data processing device,
A numerical value "1" is added to the corresponding counter in the corresponding counter areas 2a to 2j of the vehicle type information up/down counter (hereinafter referred to as UD counter) 2. For example, if the vehicle type information is (vehicle type A, forward), "1" is added to the counter area 2a by the strobe signal. Moreover, in the case of (vehicle type C2 moving backward), "1" is added to the counter area 2h. However, the initial value of the counter area is "0". Further, the UD counter 2 outputs an interrupt command signal to the interrupt circuit 3 when there is an added value.

When the interrupt circuit 3 receives an interrupt command signal, the CPU
(not shown). Here, the CPU is
If there is no power outage, a reading signal is sent to the UD counter 2, and from the counter areas 2a to 2j where the added value is,
It takes in the car model information and processes it. Thereafter, the CPU subtracts "1" from the corresponding counter in the counter areas 2a to 2j corresponding to the processed vehicle type information. Note that CL is C
PU clear line, AL is CPU address line,
DL indicates the data line of the CPU.

By the way, when the CPU function is stopped due to a power outage, when vehicle model information is input one after another to the vehicle model interface circuit 1, the counter values of the counter areas 2a to 2j corresponding to the vehicle model information of the UD counter 2 are as follows. Added sequentially. After the power is restored, the CPU processes the vehicle type information all at once until the counter values in all the counter areas 2a to 2j reach "0".

Note that the power drop detection circuit 4 monitors the voltage drop of the uninterruptible power supply 5 during a power outage, and the voltage is determined by the vehicle type interface circuit 1. When the voltage drops below the operating voltage of the UD counter 2, the AND gate 6 is turned OFF and the vehicle type interface circuit 1 is prohibited from inputting vehicle type information. After the prohibition, the UD counter 2 holds the added value and waits for the power to be restored.

[Problem to be solved by the invention]

However, the conventional vehicle type information storage means described above has the following problems. Vehicle interface circuits that operate uninterrupted due to extended power outages 1. When the uninterruptible power supply 5 supplying power to the UD counter 2 causes a significant voltage drop and the UD counter 2 loses the function of holding the added value, the counter areas 2a to 2j of the UD counter 2
Each added value of is in an undefined state.

If such a state occurs, the count values of the counter areas 2a to 2j, that is, the audit information read by the CPU after the power is restored, become unreliable.

Therefore, in the present invention, the correctness or incorrectness of the accumulated value of the vehicle type information at the time of power outage is immediately determined when the power is restored, and the reading process of the vehicle type information is executed only when it is determined to be correct, thereby preventing mistakes in reading audit information. 1] The purpose is to provide a vehicle type data processing device that can prevent accidents from occurring.

[Means to solve the problem]

The present invention takes the following measures to solve the two-pronged problem and achieve the object. That is, in a vehicle type data processing device equipped with a vehicle type information counter provided so that the vehicle type information from the vehicle type discrimination device is cumulatively added even during a power outage, the voltage from the uninterruptible power supply supplied to the vehicle type information counter is higher than the voltage from the uninterruptible power supply supplied to the vehicle type information counter. A status checking circuit that operates at a slightly lower voltage is provided, and specific data is written from the CPU to the memory section of this circuit at the time of initial startup of the device, and when the power is restored, the written specific data is read and the CPU If they match, the polarity is reversed from that at initial startup, and the data is written to the storage section of the status verification circuit, and this written data is read correctly. It is checked whether or not it is read, and when it is read normally, it is determined that the accumulated added value of the vehicle type information counter at the time of recovery from the power outage is normal, and vehicle type information processing is executed by the CPU.

[Effect]

By taking such measures, the following effects are achieved. Since we have installed a status checking circuit that can be programmed by the CPU and operates on an uninterruptible power supply, after the power is restored,
The CPU first reads the contents of the status verification circuit, compares the contents with what was written before the power outage, and if they match, determines that the added value held by the UD counter is also normal. If not, it is determined that it is pork roe, and no reading processing is performed. Therefore, the CPU can read the exact number of desk types and the like of the vehicles that passed during the power outage.

〔Example〕

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. In this figure, the same parts as in FIG. 3 are given the same reference numerals, and detailed explanations of those parts will be omitted. Reference numeral 10 denotes a state checking circuit which is the main part of the present invention, and its details are shown in FIG.

In FIG. 2, 11.12 is a memory circuit, and the CPU
It can be read and written by - and has the function of retaining the contents once written until new data is written.

Further, reference numerals 13 and 14 are memory switches, and memory circuits 11.
12. This memory switch 13
．． 14 is controlled by the CPU, and it is possible to set whether the common line of each switch is connected to the data line DL of the CPU or to another line (eg, ground as shown in the figure). Once a predetermined state is set by the CPU, that state is maintained. In any case, these are protected against power outage by the uninterruptible power supply 5. 15 is a potential generator inserted in the uninterruptible power supply circuit E.

This potential generation circuit 15 maintains the function of the state verification circuit 10 (
Storage of initial setting contents) A potential difference is provided between the limit voltage V1 and the added value holding limit voltage v2 of the UD counter 2 in the relationship of Vl<V2.

In other words, this potential difference generator 15 is provided to ensure that if the state verification circuit 10 is normal, the UD counter 2 is also normal.

Next, the operation of the vehicle type information storage means configured as described above will be explained. First, when the vehicle model data processing device is initialized (set up), the CP is transmitted via the clear line CL.
The clear signal sent from U causes UD counter 2.
The memory circuits 11 and 12 of the state verification circuit 10 are each reset. Next, the CPU selects the memory switch 1 of the status checking circuit 10.
3.14 are both switched to the data line DL side of the CPU, and bits are written in the memory circuits 11 and 12. Thereafter, vehicle type information from the vehicle type discrimination device is received as usual.

If there is a power outage and the CPU stops functioning, the UD counter 2 cumulatively adds the vehicle type information received by the vehicle type interface circuit 1 to the corresponding counter areas 2a to 2j. When the power outage is prolonged and the voltage of the uninterruptible power supply 5 drops below its operating voltage, the power drop detection circuit 4 detects this and turns off the AND gate 6, so that the vehicle type interface circuit 1 can no longer receive vehicle type information. I will be banned. As a result, the UD counter 2 does not add the vehicle type information, but only holds the cumulative added value.

Next, when the power is restored, the CPU first reads the contents of the memory circuits 11 and 12 in the status verification circuit 10, and checks whether the contents match the contents written at the time of the initial power-off, which was programmed in advance. do. And - if it is, memory switch 1
3.14 writes the bits inverted from the above matching contents to the memory circuits 11 and 12 without switching, and then writes the bits to the memory circuit 11 again.
The contents are read from 11 and 12, and if the bits are inverted, the same bits as at the time of initial startup are written into the memory circuits 11 and 12. Then, it is determined that the added value of the UD counter 2 is correct, and the added value is read.

On the other hand, if the contents of the memory circuits 11 and 12 do not match the contents written at the time of initial startup, or even if they do, bit inversion is performed without switching the memory switches 13 and 14 as described above. If a problem occurs as a result of the test, the contents of the status checking circuit 10 are corrected to the same state as at the time of initial startup, and the added value of the UD counter 2 is judged to be random (undefined), and the added value The contents of the UD counter 2 are cleared and returned to the initial state without performing the reading process.

In this way, according to this embodiment, the quality of the added value of vehicle type information is determined at the time of power restoration, and the reading process of vehicle type information containing an error is prohibited. Misreading of audit information can be prevented from occurring, and more accurate audit information can be obtained.

Note that the present invention is not limited to the embodiments described above, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

〔Effect of the invention〕

In a vehicle type data processing device equipped with a vehicle type information counter provided so that the vehicle type information from the vehicle type discrimination device is cumulatively added even during a power outage, the voltage lower than the voltage from the uninterruptible power supply supplied to the vehicle type information counter is provided. 1- Provide a status checking circuit that operates at a low voltage, write specific data from the CPU to the memory section of this circuit at the time of initial startup of the device, and read the written specific data when the power is restored. The data is compared with the data written at the time of initial startup in the CPU, and if they match, the polarity is reversed from that at the time of initial startup, and the data is written to the storage section of the state verification circuit, and this written data can be read accurately. When the vehicle type information counter is read normally, it is determined that the cumulative addition value at the time of power outage recovery is normal, and the CPU executes vehicle type information processing. Vehicle type data processing that instantly determines whether the accumulated value of information is correct or not when power is restored, and only when it is determined to be correct, the process of reading vehicle type information is executed, thereby preventing errors in reading audit information. equipment can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a diagram showing details of a state verification circuit of the embodiment. FIG. 3 is a block diagram showing the configuration of a conventional example. 1...Interface circuit for vehicle type identification device, 2...
・UD counter, 3... Interrupt circuit, 4... Low power detection circuit, 5... Uninterruptible power supply, 10... Status checking circuit, 11.12... Memory circuit, 13.14. ... Memory switch, 15... Potential generator, CL... Clear line, AL... Address line, DL... Data line, E... Uninterruptible power supply circuit. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (1)

[Claims] In a vehicle type data processing device equipped with a vehicle type information counter provided so that the vehicle type information from the vehicle type discrimination device is cumulatively added even during a power outage, the voltage is slightly lower than the voltage from the uninterruptible power supply supplied to the vehicle type information counter. A voltage-operated status checking circuit is provided, and specific data is written from the CPU into the memory section of this circuit at the time of initial startup of the device, and when the power is restored, the written specific data is read and stored in the CPU. The data is compared with the data written at the time of initial startup, and if they match, the polarity is reversed from that at the time of initial startup, and the data is written to the storage section of the state verification circuit, and whether or not this written data can be read accurately. The vehicle model data processing device is characterized in that when the vehicle model information counter is read normally, it is determined that the accumulated added value of the vehicle model information counter at the time of power outage recovery is normal, and the vehicle model information processing is executed by the CPU. .