JPS60169712A - Measured value outputting apparatus for vehicle - Google Patents

Abstract

PURPOSE:To obtain the status-frequency distribution information of items to be measured in each running section, by providing a keyboard, and performing input operations such as section specification of memory data. CONSTITUTION:The widths of the output pulses of a vehicle speed sensor 1 and a rotation sensor 2 are measured by counters (a). The vehicle speed and the number of rotation of an engine are operated by a CPU. A keyboard switch 3 is connected to the CPU through an interface circuit (e). The following input operations are performed: start and stop of measurement; update of measuring section; kinds of output information after tests; and specification of a section for memory data that is used for operation at the time of output. Therefore, in a memory 4, the measured data for every measuring section is stored by the keyboard 3. After the test, the stored data in the memory 4, i.e., the measured data for every measuring section, are outputted to a printer 5 as printing information through the interface circuit from a microcomputer 6, in correspondence with the contents of the output information specified by the keyboard.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a measurement output device for a vehicle that measures the state of a measurement target item that changes moment by moment as the vehicle travels and outputs the result in a graph.

(Prior art) Conventionally, this type of device records the frequency distribution of the state of measurement target items such as vehicle speed during the - number of driving tests, and then graphs the recorded frequency distribution after driving. There is something that outputs it.

However, since this product outputs a graph for one driving test, various driving conditions such as highway driving, constant speed driving, and traffic jam driving are included during the driving. Therefore, there is a problem in that it is not possible to obtain frequency distribution information of the state of measurement target items for each traveling section.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a measurement output device for a vehicle that can obtain frequency distribution information of the state of measurement target items in each traveling section. It is in.

(Structure of the Invention) In order to achieve the above object, the present invention, as shown in FIG. a measurement instruction means B for instructing the start and end of measurement; a graph instruction means C for instructing graph output; Corresponding to the second measurement interval, data of the frequency distribution of the state of the measurement target item in the measurement interval is stored in the first measurement interval. a storage means for storing data in a second storage area; an output means E for outputting a graph; The state of the measurement target item is determined in a sampling manner based on the state signal from the signal generating means A until a termination instruction is generated, and the state is classified into predetermined classes, and the measurement target is divided into classes according to the class. a first measuring means F that stores data of a frequency distribution accumulating the states of items in a first storage area of the storage means; and when an instruction to start a second measurement is issued from the measurement instruction means B; The state of the item to be measured is determined in a sampling manner based on the state signal from the signal generating means A until a second measurement end instruction is issued from the measurement instructing means B, and the state is classified according to the class. a second measuring means G that stores data of a frequency distribution in which the states of the measurement target items are accumulated for each class in a second storage area of the storage means; After the second measurement means F and G complete the measurement, when a graph instruction is generated from the graph instruction means C, the first . and output control means H for causing the output means E to output a graph of the frequency distribution of the state of the measurement target item in each measurement interval based on the frequency distribution data stored in the second storage area. There is.

(Effects of the Invention) Since the present invention is configured as described above, it is possible to output a frequency distribution graph showing the state of measurement target items in each traveling section, and the future of each traveling section can be determined based on the state of the graph. This has an excellent effect in that it can be used as a great reference information for how a vehicle drives.

(Example) The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention, which uses a microcomputer that executes digital arithmetic processing by software according to a predetermined measurement control program.

Sensors 1 and 2 detect the state of the vehicle while driving, and in this embodiment, they are installed in the transmission of the vehicle, measure the rotational speed of the output shaft of the transmission, and generate pulses according to the distance traveled. The engine rotation sensor 2 detects the primary voltage of the ignition coil of the vehicle and generates a pulse according to the engine rotation speed. Pulses from each sensor are input to the microcomputer 6,
The pulse interval is measured with a counter, and each time the measurement is completed, the
Generates an interrupt request to the PU. The CPU receives this interrupt request, inputs the measurement results of the counter, and performs arithmetic processing on the vehicle speed and engine rotational speed.

3 is a keyboard switch that performs all input operations for this device.As shown in Figure 3, it has various key switches, and it is used to start and end measurement, update the measurement section, and change the type of output information after the test. Performs input operations such as specifying the section of stored data to be used for arithmetic processing during output. These switch signals are input to the CPU in the microcomputer 6 via an interface circuit.

4 is a memory (RAM) that performs arithmetic processing on the basis of the data measured by each of the above-mentioned sensors with a microcomputer 6, temporarily stores the results for each measurement section, and allows the CPU to read out the stored data. be. This memory is secured for each measurement section, and each time the keyboard switch 3 updates the measurement section, the memory corresponding to the measurement section is selected.

Reference numeral 5 denotes a printer capable of printing graphs to print out output information. Print information is output from the microcomputer 6 to the printer 5 via an interface circuit.

6 is a microcomputer that executes software digital arithmetic processing according to a predetermined measurement control program, and is connected to a crystal resonator 7 of several MHz.
It enters the operating state by receiving a stabilized voltage of 5■ from the vehicle battery through the stabilized power supply circuit, performs measurements according to the input from sensors 1 and 2, and stores the measurement data for each measurement section in the memory 4. After the test, the data stored in the memory 4 is calculated according to the content of the output information designated by the keyboard switch 3, and each calculation process is performed until the result is output from the printer 5. The microcomputer 6 has a read-only memory (ROM) that stores a measurement control program that defines the procedure of the arithmetic processing, and sequentially reads out the measurement control program from this ROM and executes the corresponding arithmetic processing. Central processing unit (CPU)
, a memory (RAM) that temporarily stores various data related to the arithmetic processing of the CPU and allows the data to be read by the CPU, and a crystal oscillator 7 to generate reference clock pulses for the various arithmetic operations. a clock generator that measures the pulse interval of the pulse train detected by the sensors 1 and 2, and a counter that outputs an interrupt request to the CPU every time the measurement is completed; It consists of an interface circuit that performs

FIG. 4 shows the structure of the memory 4, which is composed of frequency distribution tables of vehicle speed, engine rotation speed, and acceleration for each measurement section, and is capable of measuring up to 10 sections. The width of each class in the frequency distribution table is 20km/h, 11000rp, 0
．． Each is divided into 6 parts by IG. In addition, each degree is the average vehicle speed, average engine rotation speed, and acceleration calculated every second.
It is determined by which class it falls into.

Next, the operation of the above configuration will be explained with reference to the calculation flowcharts shown in FIGS. 5 to 8.

FIG. 5 is a calculation flowchart showing the calculation processing of the normal routine of the microcomputer 6, and FIG. 6 is a calculation flowchart showing the calculation processing of the timer interrupt routine executed at fixed intervals. Create a table. FIG. 7 is a calculation flowchart showing the calculation process of the vehicle speed interrupt routine that calculates the vehicle speed every time a pulse from the vehicle speed sensor 1 is input, and FIG. It is a calculation flowchart which shows the calculation process of the engine rotation speed interruption routine which calculates rotation speed.

Then, the normal routine and each interrupt routine are combined to execute calculation processing by the measurement control program.

First, the arithmetic processing of the microcomputer 6 will be explained. When a stabilized voltage is supplied from the vehicle battery to the microcomputer 6 through the stabilized power supply circuit, the microcomputer 6 starts operating and performs various arithmetic operations according to various predetermined programs. That is, by receiving power supply, step 101 to star 1 in the normal routine of FIG.
The arithmetic processing is started, and the process proceeds to the initial setting step 102, where the registers, counters, latches, etc. of the microcomputer 6 are set to the initial state necessary for starting the arithmetic processing.
The process advances to the next measurement setting step 103.

First, the start and end of measurement will be explained. Checking the measurement flag In step 104, the measurement flag is checked,
Determine whether measurement is in progress. When measurement is prohibited, it is possible to accept the start of measurement by inputting the keyboard switch 3, and the measurement start check step 10 is performed.
Proceed to step 5.

In the measurement start check step 105, it is checked whether the input operation of the keyboard switch 3 has started. When starting, the process proceeds to measurement permission step 106, where the measurement period counter is incremented by 1 to update the measurement period, and furthermore, the measurement flag is permitted and vehicle speed, engine speed, and acceleration calculations and memory 4 are performed by each interrupt routine. , and the process returns to the measurement flag check step 104 again.

In the measurement flag check step 104, the measurement flag is checked, and if the measurement is in progress, the process proceeds to the measurement end check step 107, in which it is checked whether an end input operation is performed using the keyboard switch 3. If the end input operation has not been performed, the process returns to step 104 again. That is, during measurement, steps 104 to 107 are repeated in the normal routine until the end input operation is performed, and measurement and frequency distribution table creation by each interrupt routine is continued.

When a termination input operation is performed with the keyboard switch 3, the process proceeds from step 107 to measurement prohibition step 108, where the measurement flag is prohibited, and measurement and frequency distribution table creation in each interrupt routine are prohibited and suspended. Then, the process returns to the measurement flag check step 104 again.

104-41 from measurement flag check step 104
Steps 05→109 are repeated.

When updating the measurement section and performing re-measurement, the input operation for starting is performed using the keyboard switch 3, thereby executing the measurement permission step 106 via the measurement start check step 105.

In other words, when updating the measurement interval and repeating the measurement,
All you have to do is repeat the input operation from "start" to "end" with the keyboard switch 3 (and various frequency distribution tables for each measurement section are created in the memory 4 through the arithmetic processing of the microcomputer 6.

Next, the calculation process for print output will be explained. Print output is permitted when measurement is suspended, that is, when the measurement flag is disabled. Flow 104 of the above-mentioned suspended arithmetic processing
→lo5→109, when a print input operation is performed using the keyboard switch 3, the input is checked using the print check template 109, and the process proceeds to step 110 for specifying output information.

In the output information designation step 11o, the printer 5 is first instructed to print "Histogram?" and to input from the keyboard switch 3 which one of the histograms shown in FIGS. 9 to 11 is to be output. When outputting a histogram of vehicle speed, input 1'' → ``ENT'', when outputting a histogram of engine speed, input 2'' → ``ENT'', and when outputting a histogram of acceleration, input 3'' - ``ENT''.

When this input operation is performed, the printer 5 is instructed to print "Kukan?" and to input from the keyboard switch 3 the measurement interval of the frequency distribution table in the memory 4 used for creating the histogram. When the measurement section is only the first measurement section, "1" - "ENT" → "ENT", the combination of the first and second measurement section, 1" → aENT" → "2"→"
ENT"-"ENT" should be input.

When this input operation is performed, the process proceeds to print output arithmetic processing step 111, and print information is created using the data stored in the memory 4 corresponding to the histogram type and measurement interval specified in step 110. For example, if the measurement interval is 1 and 2 in the vehicle speed histogram, D111+0
211D112+D212,...D116+D216
is calculated, and print information for creating a histogram is created based on the results. This print information is temporarily stored in the memory (RAM) of the microcomputer 6.
It is read out in the next print output step 112 and output to the printer 5.

When the creation of one histogram is completed through the above calculation process, the process returns to the measurement flag check step 104, and 1
Steps 04→105→109 are repeated, resulting in an interrupted state, and it becomes possible to create the next histogram and perform re-measurement with the measurement interval updated.

Next, the calculation processing of the vehicle speed interrupt routine will be explained. The measurement setting step 103 is executed in the normal routine, the interrupt is enabled, the pulse from the vehicle speed sensor 1 is input to the counter of the microcomputer 6, the measurement of the pulse interval is completed, and an interrupt request is issued to the CPU. Then, the arithmetic processing of the normal routine is temporarily interrupted, the arithmetic processing is started at the start step 301 in the vehicle speed interrupt routine in FIG. 7, and the process proceeds to the measurement flag check step 302.

The measurement flag check step 302 checks whether measurement is permitted, and if it is prohibited, the process proceeds to return step 305 without executing any subsequent calculation processing, and returns to the original normal routine calculation processing. return.

When measurement is permitted, the process proceeds to a vehicle speed calculation step 303, where the vehicle speed V is calculated from the measurement data of the pulse interval of the counter.

In the integrated data calculation step 304, the integrated value Σ■ of the vehicle speed V and the number of integrated values NY are calculated in order to calculate the average vehicle speed per second used in creating the frequency distribution table of vehicle speeds in the memory 4.

The integrated value ΣV and the integrated number NV are cleared after calculating the average vehicle speed for 1 second in the timer interrupt routine described later.
0”.

When the calculation process of this integrated data calculation step 304 is completed, the process proceeds to return step 305, and the process returns to the original normal routine calculation process. This vehicle speed interrupt routine is executed every time an interrupt request from the counter occurs, that is, every time a pulse from the vehicle speed sensor 1 occurs.

Regarding the engine speed interrupt routine shown in FIG. The integrated value ΣE/G and its integrated number Ne are calculated.

Next, the arithmetic processing of the timer interrupt routine will be explained.

When the measurement setting step 103 in the normal routine is executed and interrupts are enabled, and an interrupt request with an interval of 1 second is issued to the CPU from the clock generator, the arithmetic processing in the normal routine is temporarily interrupted. , the arithmetic processing is started from the start step 201 in the timer interrupt routine of FIG. 6, and the process proceeds to the measurement flag check step 202.

In measurement flag check step 202, it is checked whether measurement is permitted, and if it is prohibited, the process proceeds to return step 208 without executing subsequent calculation processing, and returns to the original calculation processing of the general routine.

If measurement is permitted, average vehicle speed calculation step 20
Proceeding to step 3, ΣV/Nv is calculated using the vehicle speed integrated value ΣV calculated in the vehicle speed interrupt routine and the number of integrations Nv, and the average vehicle speed for 1 second is calculated. Similarly, in the average engine rotation speed calculation step 204, the average engine rotation speed E/G for one second is calculated.

In the integrated data clearing step 205, integrated data ΣV, Nv, ΣB/G, and Ne are cleared and set to "θ" in order to calculate the average vehicle speed and average engine rotation speed for the next one second.

In acceleration calculation step 206, average vehicle speed calculation step 2
The difference between the average vehicle speed ■ determined in 03 and the average vehicle speed V'' one second ago (
Vehicle acceleration G is calculated from V-'V').

In the frequency distribution table creation step 207, the average vehicle speed V, average engine rotation speed "7σ, acceleration G, and
A frequency distribution table in the memory 4 is created using the measurement section counter set in the measurement permission step 106 of the normal routine. First, from the contents of the measurement interval counter, it is determined for which measurement interval in the memory 4 shown in FIG. 4 three types of frequency distribution tables are to be created. For example, if the measurement interval counter is “1”
”, the vehicle speed, engine rotation speed, and acceleration degrees D111 to D116, D121 in the memory area of measurement section 1
~D126 and D131~D136 are the targets of calculation.

Next, it is calculated which of the six classes in the vehicle speed frequency distribution table the average vehicle speed (■) corresponds to, and the frequency of the corresponding class is incremented by one. Similarly, for the average engine speed and acceleration, each frequency of the corresponding class is incremented by 1 to create a frequency distribution table, and the process advances to return step 208 to return to the calculation process of the normal routine.

To summarize the above interrupt routines, the vehicle speed interrupt routine and engine speed interrupt routine calculate the cumulative data of vehicle speed and engine speed, and the timer interrupt routine that is executed every second calculates the average of this cumulative data. The vehicle speed, average engine speed, and acceleration are calculated, and three types of frequency distribution tables corresponding to the measurement section counters are created from the results.

Next, a description will be given of the overall operation when the vehicle is measured by driving in a city area in the first measurement section, on an expressway in the second, and in a congested area in the third.

First, when a stabilized power supply is supplied to this device, the calculation process starts from the start step 101 shown in FIG. 3, and the measurement flag is disabled, the measurement interval counter is set to 0, and interrupts are enabled. Repeat this and wait for the start input operation from keyboard switch 3. In this state, each interrupt is permitted and interrupt requests are accepted, but since the measurement flag is prohibited, vehicle speed, engine rotation speed,
Acceleration calculations and frequency distribution table creation are not performed.

When the vehicle enters a city area, if a start input operation is performed from the keyboard switch 3, the measurement section counter will be set to 0-1 in the measurement permission step 106, the measurement flag will become prohibited-permitted, and the vehicle speed and engine rotation speed will be changed according to each interrupt routine. , acceleration calculation is started, and three types of frequency distribution tables for measurement section 1 of memory 4 shown in FIG. 4 are created. This measurement state is 1
This continues while the steps 04-107 are repeated, that is, until the end input operation is performed from the keyboard switch 3.

When the vehicle changes course from the city area to the expressway, an end input operation is performed using the keyboard switch 3, and the measurement flag is inhibited in a measurement prohibition step 108, and the measurement in the measurement section 1 is terminated and an interrupted state is established. In the suspended state, steps 104 → 105 → 109 are repeated in the same way as the calculation process from power supply until the start input operation is performed using the keyboard switch 3, and the calculations of vehicle speed, engine speed, and acceleration and creation of the frequency distribution table are performed. Interrupted.

When the vehicle enters the expressway and performs a start input operation from the keyboard switch 3, the measurement section counter is set to 1-2 in the measurement permission step 106, the measurement flag is set to prohibit-permission, and the measurement state is entered, and the frequency of the second measurement section is set. Create a distribution table.

When the vehicle changes course from a highway to a congested area, the same end-start input operation as above may be performed. Subsequently, when the end input operation is performed, calculation of the vehicle speed, engine speed, and acceleration and creation of the frequency distribution table in the congested area, that is, the third measurement section are prohibited.

When the result is to be output from the printer 5 after completing the actual driving as described above, a print input operation is performed using the keyboard switch 3, and the arithmetic processing proceeds to step 110 for specifying output information.

If you want to obtain a histogram of vehicle speed in the combined section of measurement sections 1 and 2 shown in FIG. Make sure that
Enter “1” → “ENT” from keyboard switch 3 to specify the vehicle speed histogram, then check that “Kukan?” is printed, and then press “1” → “ENT” → “2” → “
When the input operation of "ENT" → "ENT" is performed, the process proceeds to print output calculation processing step 111, where print information is created using the data of the frequency distribution table of vehicle speeds in measurement sections 1 and 2 in the memory 4, and the print information is sent to the printer 5. A histogram of vehicle speed is printed out.

Similarly, if you want to obtain a histogram of engine speed when driving in a city area, expressway, and congested area as shown in Figure 10, select "Print" → "2" → "ENT" → "1"→"
BNT"→"2"→"'ENT"→"3"→" ENT
Just perform the input operation in the order of ``→''ENT''. No. 11
The figure shows a histogram of acceleration when driving on an expressway.

Note that in the above embodiment, the vehicle speed and the engine rotation speed.

We have shown a device that obtains an acceleration histogram, but if you add a flow meter that measures the fuel flow rate consumed by the vehicle's internal combustion engine and generates pulses according to the amount of fuel consumption, you can calculate the fuel consumption rate (km/β) You can get a histogram of

Regarding the calculation processing in this case, it is necessary to add a fuel consumption rate (β/h) interrupt routine and a step regarding the fuel consumption rate (km/7) in the timer interrupt routine.

The fuel consumption rate (j2/h) interrupt routine calculates the fuel consumption rate (j2/h) and its integrated data in the same way as the vehicle speed interrupt routine shown in FIG.

In the timer interrupt routine, the average fuel consumption rate per second (β/
h), the value obtained by dividing the average vehicle speed per second by this calculation result, that is, the fuel consumption rate (km/β), and a frequency distribution table thereof are created.

The structure of the memory 4 of this embodiment is such that a frequency distribution table of fuel consumption is added to the three types of frequency distribution tables shown in FIG.

Furthermore, in the above embodiment, the class of the frequency distribution table is the vehicle speed.

Although the engine rotation speed is divided into a single element, a plurality of elements may be combined to represent the vehicle speed distribution in each acceleration state (acceleration state, stable state, deceleration state), for example. In this case, the arithmetic processing may be performed by performing calculations using a plurality of elements in the frequency distribution table creation step 207 shown in FIG.

In the embodiments described above, the printer 5 is used as a means for outputting the results, but the same effect can be achieved by using display means such as a liquid crystal display or a fluorescent display tube.

Furthermore, in addition to vehicle speed, engine rotational speed, and fuel consumption, measurement means related to vehicle conditions such as water temperature, oil temperature, engine intake pressure, and ignition advance angle may be used, and the results may be output.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the structure of the present invention, Fig. 2 is a general block diagram showing an embodiment of the present invention, Fig. 3 is a block diagram showing the structure of a keyboard switch, and Fig. 4 is a memory of frequency distribution. FIGS. 5 to 8 are operation flowcharts showing the arithmetic processing of the microcomputer, and FIGS. 9 to 11 are graph output diagrams showing the graph output, respectively. 1... Vehicle speed sensor, 2... Engine rotation sensor, 3
...Keyboard switch, 4...Memory, 5...
Printer, 6...microcomputer. Representative Patent Attorney Takashi Okabe Figure 1 [2] Figure 3 Figure 4 Figure 9 Figure 10 Figure 11

Claims (1)

[Scope of Claims] Signal generating means for generating a status signal representing the status of a measurement target item that changes moment by moment as the vehicle travels, measurement instruction means for instructing the start and end of measurement, and graph output. a graph indicating means for instructing; Corresponding to the second measurement interval, data of the frequency distribution of the state of the measurement target item in the measurement interval is stored in the first measurement interval. a storage means for storing data in a second storage area; an output means for outputting a graph; and when the measurement instruction means generates an instruction to start the first measurement, the measurement instruction means generates an instruction to end the first measurement. The state of the item to be measured is determined in a sampling manner based on the status signal from the signal generating means until the state of the item to be measured is determined, the status is divided into predetermined classes, and the status of the item to be measured is accumulated for each class. a first storage area for storing frequency distribution data in a first storage area of the storage means;
a measuring means, and when an instruction to start a second measurement is issued from the measurement instruction means, sampling is performed based on a status signal from the signal generation means until an instruction to end the second measurement is issued from the measurement instruction means. The state of the measurement target item is stored in the second storage area of the storage means, the state is divided into classes according to the class, and data of a frequency distribution in which the state of the measurement target item is accumulated for each class is stored in the second storage area of the storage means. a second measuring means for determining the first measurement; When a graph instruction is generated from the graph instruction means after the measurement by the second measurement means is completed, the first . A measurement output device for a vehicle, comprising an output control means for causing the output means to output a graph of the frequency distribution of the state of the measurement target item in each measurement interval based on frequency distribution data stored in a second storage area.