JPH0814935A - Electronic integrating meter - Google Patents

Abstract

(57) [Abstract] [Purpose] An ignition voltage determination circuit that has been conventionally required by configuring a control unit that includes a drive determination unit that confirms the presence / absence of a pulse input and permits and prohibits the operation of the drive circuit. Is unnecessary. [Structure] The pulse oscillating unit 1 generates a pulse signal a for each constant traveling distance. The control means B confirms the presence or absence of the pulse signal a from the pulse oscillating unit 1 and outputs permission signals d1 and e1 and operation completion signals d2 and e2 for controlling the operation of the drive circuit, and counts the pulse signal a. The drive determination unit 2 includes a first CPU 2a that outputs a distance signal d3 for each unit traveling distance, and a second CPU 3 that calculates an integrated traveling distance according to the distance signal d3 for each unit traveling distance. The memory unit 4 has a non-volatile memory that stores the accumulated traveling distance, and performs reading and writing to the non-volatile memory. The display unit 5 includes a driver 5a that controls the display of the total traveling distance according to the permission signal e1 and the operation completion signal e2 from the drive determination unit 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic integrator mounted on, for example, an automobile or a motorcycle and capable of electronically storing count values such as the distance traveled.

[0002]

2. Description of the Related Art As an electronic integrator, for example, an electronic odometer indicating an accumulated traveling distance of a vehicle is such that a counter portion counts a pulse signal from a traveling distance sensor for converting the number of rotations into a wheel shaft of the vehicle. The integrated travel distance obtained from the count value in the count unit is displayed on an appropriate digital display, but the battery of the vehicle is used as the power source of the electronic odometer, and unexpected changes such as battery replacement or other disconnection are made. If the power supply to the counter is stopped due to the situation, the accumulated mileage data will be lost, so the accumulated mileage data will be stored in a non-volatile memory (EEPROM).
Is being written to. In addition, the electronic odometer equipped with such a nonvolatile memory reads out the data value stored in the nonvolatile memory at the same time when the display is restarted, that is, when the vehicle ignition switch is turned on,
Based on this, the traveling distance is displayed (JP-A-59-196414 and JP-A-65-254013).
(See the official gazette).

In such an electronic odometer, its drive circuit is connected to a battery power source and an ignition switch is turned on so that the count value of the counter which does not reach the number of pulses corresponding to a unit traveling distance can be backed up. The ignition voltage, which is sometimes supplied, is supplied to the drive circuit via an ignition voltage determination circuit, and the ignition voltage determination circuit determines that the voltage supplied to the drive circuit has reached a sufficient level for the drive circuit. The drive circuit that performs stable operation is obtained by starting the operation of the drive circuit later, and the drive circuit and the ignition voltage determination circuit form a drive system of an electronic odometer.

[0004]

In the electronic odometer having such a structure, the ignition voltage judging circuit composed of the comparator, the resistance and the like is required separately from the drive circuit constituting the electronic odometer. Must consider the voltage fluctuation (hysteresis voltage) at the time of turning on / off the ignition power supply. Therefore, the variation of resistance and the temperature characteristic must be taken into consideration, and there is a problem that the resistance selection is troublesome.

Further, since it is necessary to deal with the chattering of the ignition voltage determination output from the ignition voltage determination circuit on the circuit or on the program, there is a problem that the drive circuit of the electronic odometer becomes complicated. It was

[0006]

In order to solve the above-mentioned problems, the present invention provides a pulse oscillating section for generating a pulse signal according to a change in a measuring point, and a counter for counting the pulse signal from the pulse oscillating section. And a drive determination unit that outputs a control signal that confirms the presence or absence of a pulse input through the counter and that permits and prohibits the operation of the drive circuit, and
A control unit that counts the pulse signal and calculates an integrated change amount for each unit change amount; and a memory unit that has a nonvolatile memory that stores the integrated change amount and that reads and writes to the nonvolatile memory. And a display unit having a drive unit for controlling the display of the integrated change amount in accordance with a control signal from the control unit.

Further, a pulse transmission section for generating a pulse signal for each constant traveling distance, and a counter for counting the pulse signal from the pulse oscillation section are provided, and the presence or absence of pulse input is confirmed through the counter to check the drive circuit. Control means for outputting a control signal for permitting and prohibiting operation, counting the pulse signals to calculate an integrated traveling distance for each unit traveling distance, and a non-volatile memory storing the accumulated traveling distance. And a display unit having a drive unit for controlling the display of the total traveling distance according to a control signal from the control unit. Is.

[0008]

[Function] A drive determination unit for checking the presence / absence of a pulse input and outputting a control signal for controlling (permitting / prohibiting) the operation of the drive circuit is provided, and the pulse signal is counted to calculate an integrated change amount for each unit change amount By configuring the control means for calculating, the ignition voltage determination circuit (external circuit), which is conventionally required separately from the drive circuit of the electronic integrator, is not required. Therefore, on the circuit for chattering of the ignition voltage or This does not require program correspondence, simplifies the drive circuit, and enables downsizing of the system, contributing to effective use of vehicle space.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic odometer of the present invention will be described below with reference to an electronic odometer of the embodiment shown in the accompanying drawings.

FIG. 1 is a block diagram showing a circuit configuration of an embodiment in which the present invention is applied to an electronic odometer for a vehicle. This electronic odometer A includes a pulse oscillating section 1, a control means B and a memory. The pulse oscillating unit 1 is installed on a wheel shaft, which is a measuring point capable of detecting the traveling distance (change amount) of the vehicle, and includes a pulse signal a depending on the number of revolutions. Is output.

The control means B, when the vehicle starts traveling,
First and second counters C1 and C2 that count rising or falling edges of the pulse signal a and output count-up signals b and c, and first and second counters C1 and C
The second CP, which will be described later, determines the pulse signal via
U3 and permission signals (control signals) d1 and e1 and operation completion signals (control signals) d2 and e2 that control (permit / prohibit) the operation of the driver 5a of the display unit 5 to be described later, and a predetermined travel distance (unit change amount) Distance signal (pulse signal) output for each
The drive determination unit 2 including the first CPU 2a that outputs d3, and the travel distance storage data f that is read from the memory unit 4 described below by the permission signal d1 from the first CPU 2a.
The display signal g associated with this mileage stored data f is output,
In addition, the second CP for calculating the integrated traveling distance (integrated change amount) by processing the distance signal d3 and the traveling distance storage data f.
It consists of U3.

The memory section 4 is composed of a non-volatile memory for storing the contents of the arithmetic processing (total traveling distance). The display unit 5 also displays the driver 5a that converts the display signal g from the second CPU 3 into a displayable drive signal h, and the integrated travel distance that accompanies the drive signal h from the driver 5a.
For example, it comprises a display device 5b for digital display.

The electronic odometer A is connected to a battery power source (not shown) of the vehicle. The electronic odometer A comprises first and second counters C1 and C2 and first and second CPUs 2a, which constitute the electronic odometer A. The power supply voltage is always applied to 3.

Next, the operation of the electronic odometer having such a configuration will be described as an electronic odometer that rewrites with 1 Km = 2548 pulses, with reference to the flowcharts of FIGS.

The first CPU 2a, as shown in FIG.
When the vehicle travels and the pulse signal a from the pulse oscillating unit 1 is input to the first counter C1 (step 100),
By writing 1 to the first counter C1, the first counter C
1 is preset (step 101). After that, the pulse signal a within a predetermined time arbitrarily set
Is input (step 102), and when the pulse signal a is input within a certain period of time, the first counter C1 starts counting (step 103), and a specific count set in advance is set. Counting is continued until the value reaches, for example, "5" (step 102 to step 10).
4). Then, the first CPU 2a uses the first counter C
When 1 reaches the specific count value "5" and the count-up signal a is input, the pulse input is confirmed (it is determined that the vehicle is starting to move), and the second CPU 3 and the driver 4
And output permission signals d1 and e1 respectively (step 1
05).

Then, the first CPU 2a, which has output the permission signals d1 and e1 respectively (step 105), confirms whether or not the pulse signal a is input within an arbitrarily set fixed time (step 106). When the pulse signal a is input within the fixed time, the second counter C2 starts counting (step 107). The second counter C2 is
A value "2548-5 = 25" obtained by subtracting the specific count value "5" of the first counter C1 from the specific count value "2548" corresponding to 1 Km for outputting the first distance signal d3.
43 "(the first counter C1 has already counted 5; therefore, the subtracted value is taken as 1 Km data) and counting continues (step 106 to step 10).
8).

Next, when the second counter C2 reaches the specific count value "2548-count value of counter C1" of the pulse signal a corresponding to 1 Km, the first CPU 2a receives the count-up signal b. , The second C described later
PU3 outputs the distance signal d3 corresponding to 1 km required for the first data update (step 109). After that, the first CPU 2a causes the first and second counters C1,
The counter value is reset to return C2 to the initial state (step 110).

Then, the first CPU 2a judges whether or not the pulse signal a is input within an arbitrarily set fixed time (step 111), and when the pulse signal a is input within the fixed time. , The reset second counter C2
(Step 110) starts counting (Step 11
1), the second counter C2 is repeatedly counted until the count value reaches the specific count value "2548" corresponding to 1 Km (steps 111 to 113). Then, in the first CPU 2a, the second counter C2 is 1 km
When the count-up signal b is input after reaching the specific count value corresponding to, the second CPU 3 outputs the distance signal d3 corresponding to 1 km required for the second data update (step 114), , The first CPU 2a is 3
The second counter C2 is reset again to output the distance signal d3 after the first time (step 115), and the input of the pulse signal a is confirmed (step 11).
1).

The pulse signal a within a fixed time set arbitrarily.
Steps 106 and 1 for determining whether or not is input
11, when the vehicle is stopped and the pulse signal a is not input, the first CPU 2a determines that the vehicle is stopped, and notifies the second CPU 3 and the driver 5a of the display unit 5 of the operation completion signal d2. , E2 are output for a predetermined period of time (step 116) to terminate the operation of the system and return to the initial state (step 100).

The first CPU 2a executes step 10
2 to 104, steps 106 to 108, step 111
In steps 113 to 113, if the vehicle stops and the pulse signal a is not input before the specific count value is reached, it is programmed to terminate the operation of the system and return to the initial state (step 100) (step 100). 102,
106, 111), when the vehicle starts traveling again and the pulse signal a is input, the first CPU 2a in steps 102 to 104 outputs the pulse signal from the specific count value “2548 = 1 Km” of the second counter C2. The count value of the first counter C1 at the time when a is no longer input, for example, the value “2548-3” obtained by subtracting “3” is set as the specific count value of the second counter C2, and an error is added to the accumulated traveling distance. I try not to occur. Therefore, step 10
The operation of the first CPU 2a after returning to the initial state in 2 to 104 is the first from the specific count value of the second count C2.
The count value of the counter C1 is subtracted to correct the specific count value of the second counter C2.

Further, the first CPU 2a in steps 106 to 108 outputs the pulse signal a in steps 102 to 104.
After the input is confirmed, the count value of the second counter C2 at the time when the pulse signal a is not input, for example, “150
The value "1500 + 5 = 1505" obtained by adding the specific count value "5" of the first counter C1 to "0" is set as the count value of the second counter C2 so that an error does not occur in the cumulative traveling distance. . Therefore, step 10
The operation of the first CPU 2a after returning to the initial state in 6 to 108 is to add the count value of the first counter C1 to the count value of the second counter C2 regardless of whether the specific count value is reached or not reached. Then, the count value of the second counter C2 is corrected.

In steps 111 to 113,
The first CPU 2a performs the same processing as steps 106 to 108.

Next, the operation of the second CPU 3 which operates according to the output signal output from the first CPU 2a will be described with reference to FIG.

The second CPU 3 checks whether or not the permission signal d1 (step 105 in FIG. 2) output from the first CPU 2a has been input (step 200). The existing mileage storage data f is read from the memory unit 4 (step 20
2) The display signal g associated with the travel distance storage data f is output to the driver 5a of the display unit 5 (step 202).
At this time, the driver 5a converts the display signal g into a digitally displayable drive signal h and causes the display 5b to display the accumulated traveling distance data.

After outputting the display signal g to the driver 5a, the second CPU 3 confirms whether or not the distance signal d3 per unit traveling output from the first CPU 2a has been input (step 203). ), When the distance signal d3 is input, the distance signal d3 per unit traveling and the traveling stored data f are arithmetically processed, and then the data in the memory unit 4 is updated and the display signal g is output to the driver 5a. (Step 204). Then, in steps 106 and 111 of FIG. 2 in which the first CPU 2a confirms the input of the pulse signal a, it is determined whether or not the operation completion signal d2 output when the input of the pulse signal a cannot be confirmed is input. If it is not input (step 205), the input of the distance signal d3 per unit traveling is awaited (step 203), and the processing of steps 203 to 205 described above is repeated unless the operation completion signal d2 is input. Also,
When the operation completion signal d2 output from the first CPU 2a is input, the second CPU 3 is programmed to return to the initial state.

The electronic odometer A controls the second CPU 3 and the display unit 5 according to the presence / absence of the input of the pulse signal a by providing the drive determination unit 2 and operates the drive circuit of the electronic odometer A. However, since the ignition voltage determination circuit (external circuit) required for stable operation as in the past is not required, it is not necessary to respond to the chattering of the ignition voltage on the circuit or in the program. The drive power supply for driving the electronic integrator is only the battery power supply that backs up the count value of the counter that does not reach the number of pulses corresponding to the unit traveling distance, and thus the drive circuit is simplified. Further, the drive system can be downsized, which contributes to effective use of vehicle space.

In this embodiment, the microcomputer (first C
Although the drive determination unit 2 that controls by the PU 2a) has been described, the present invention is not limited to this, and the drive determination unit may be configured by hardware.

Further, in the present embodiment, the control means in which the first CPU 2a and the second CPU 3 are separated has been described, but the control means may be constituted by one CPU provided with the drive determination section. Is.

Further, in addition to the electronic odometer described in the above embodiment, the same may be applied to a trip meter or a usage time accumulator (hour meter) that measures and displays the usage time of a vehicle as a measured amount. You can

[0030]

The present invention has a pulse oscillating unit for generating a pulse signal according to a change in a measurement point and a counter for counting the pulse signal from the pulse oscillating unit, and determines whether or not a pulse is input through the counter. Control means for checking and outputting a control signal for permitting and prohibiting the operation of the drive circuit, and control means for counting the pulse signals to calculate an integrated change amount for each unit change amount, and the integrated change A display unit including a memory unit having a non-volatile memory for storing the amount and performing reading and writing to the non-volatile memory, and a drive unit for controlling the display of the integrated change amount according to a control signal from the control unit. And a counter that counts the pulse signal from the pulse oscillating unit and a pulse transmitting unit that generates a pulse signal at each constant traveling distance. It is equipped with a drive determination unit that outputs a control signal for permitting and prohibiting the operation of the drive circuit by checking the presence / absence of a pulse input through the counter, and counts the pulse signal to calculate an integrated travel distance for each unit travel distance. A control unit, a memory unit having a non-volatile memory for storing the accumulated traveling distance, for reading and writing to the nonvolatile memory, and a drive for controlling display of the accumulated traveling distance according to a control signal from the control unit. And a display unit having means, which makes it possible to control the drive circuit of the electronic integrator according to the presence or absence of the input of a pulse signal by configuring the drive determination unit in the control unit. Since the ignition voltage determination circuit, which was required as an external circuit, is no longer required, the circuit or program for the chattering of the ignition voltage can be eliminated. Response is not required, and simply for may be connected to the count value or the like can be backed up battery power only, to simplify the driving system of the electronic totalizer. Further, the drive system as an electronic integrating meter can be downsized, which contributes to effective use of vehicle space.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an exemplary embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the first CPU of the above embodiment.

FIG. 3 is a flowchart showing the operation of the second CPU of the above embodiment.

[Explanation of symbols]

 1 pulse oscillating unit 2 drive determining unit 4 memory unit 5 display unit 5a driver A electronic integrator B control means d1, e1 permission signal (control signal) d2, e2 operation completion signal (control signal)

Claims (2)

[Claims] 1. A pulse oscillating unit for generating a pulse signal according to a change in a measurement point, and a counter for counting the pulse signal from the pulse oscillating unit are provided, and driving is performed by confirming the presence or absence of pulse input through the counter. A drive determination unit that outputs a control signal that permits and prohibits the operation of the circuit, and
A control unit that counts the pulse signal and calculates an integrated change amount for each unit change amount; and a memory unit that has a nonvolatile memory that stores the integrated change amount and that reads and writes to the nonvolatile memory. An electronic integrator comprising: a display unit having a drive unit for controlling the display of the integrated change amount in accordance with a control signal from the control unit. 2. A drive circuit which has a pulse transmitting section for generating a pulse signal at a constant traveling distance and a counter for counting the pulse signal from the pulse oscillating section, and confirms the presence / absence of a pulse input through the counter. Control means for outputting a control signal for permitting and prohibiting operation, counting the pulse signals to calculate an integrated traveling distance for each unit traveling distance, and a non-volatile memory storing the accumulated traveling distance. An electronic device including a memory unit for reading and writing data to and from the non-volatile memory, and a display unit including a drive unit for controlling the display of the total traveling distance according to a control signal from the control unit. Formula totalizer.