JPS5934112A - Integrating cyclometer - Google Patents

Abstract

PURPOSE:To make it possible to hold an integrating travel distance even if a battery is removed, by integratig and writig a certain distance in a nonvolatile memory each time when a vehicle travels this distance within a certain vehicle speed range. CONSTITUTION:According as the vehicle travels, a traveling pulse train 2 is generated and is inputted to a display control circuit 3. This pulse train 2 is counted in the display control circuit 3, and an integrating travel distance is calculated on the basis of the relation between the size of wheels and the pulse pitch, and a display element 4 is controlled to display this integrating travel distance. Simultaneously, when it is detected that the vehicle travels a certain distance within a certain vehicle speed range, this distance is integrated and written in a storage circuit 5. Since the storage circuit 5 is nonvolatile, the integrating travel distance is not lost even if the battery is removed for assessment, inspection, and maintenance.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a computerized odometer, that is, a cumulative mileage meter, for a vehicle such as an automobile.

Traditionally, most odometers have been mechanical, in which the rotation of the wheels is transmitted via a transmission shaft to the odometer built into the instrument panel, and a drum with numbers engraved on it rotates. and displays the distance traveled.

By the way, recently, the electronicization of instrument panels has progressed, and conventional mechanical meters such as speedometers, tachometers, fuel gauges, and water temperature31 have been replaced with electronic meters that use fluorescent display tubes, light emitting diodes, etc. It's coming. Under these circumstances, the trilough meter, which is the main form of a running distance meter, has been computerized from an early stage, but the trip meter is an auxiliary device for relatively short distances that can be reset at will by the driver. On the other hand, the odometer, which is also one of the 8゛1 mileage indicators, displays the cumulative mileage since the vehicle was manufactured, so it can be used as a guide for assessment and inspection and maintenance. There is a technical problem in that if you remove it, the memory of the mileage is erased, so it is not widely used at present.

It is an object of the present invention to eliminate such problems and to provide a cumulative odometer that stores the distance traveled up to that point even when the power supply is temporarily cut off.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and 1
, (1) is a signal of a pulse train (2) that is electrically generated as a wheel (not shown) rotates, and (3) is a display that numerically displays the distance traveled on a display element (4). The control circuit (5) is a memory circuit that stores the running distance as an electrical signal and can retain the stored contents even after the power supply is stopped.

FIG. 2 shows a microcomputer (with 10 grams of instructions when using a microcomputer (not shown in FIG. 1) for the display control circuit (3) in FIG. 7
) or the starting point of the circle, (7) is a memory node (not shown) that stores the number of pulses of the running pulse train (2), and increases the number of pulses by 1 each time a running pulse is input, thereby counting the pulses. (8) ) is the number of travel pulses corresponding to a predetermined constant travel distance. A group of tourograms that detects the coincidence of the number of pulses in 1riJ and performs the function of detecting traveling a certain distance, 19! f; j Note the number of times the number of pulses matched in the fixed distance travel detection function grogram group (8) IJ
−1 (not shown), tIO
+ is the program NY that clears the memorino to zero.
i, (Ill is a constant vehicle speed υCOυa where the vehicle speed υ is predetermined
((However, a program group that detects that it is within the range of υC + (υ.,) and performs a vehicle speed detection function, 112 is a program group that determines whether the memory a is 1 or more, (
131 is a memory circuit in FIG. 1, a group of programs that performs the cumulative mileage storage control function of cumulatively storing in the road (5) a distance traveled that is an integral multiple of the above-mentioned fixed distance;
The circle is a program group that zeroes out the memo +7 2, the shout is the 10 grams group (7) or the end point of the circle, (161
or cause) is a branching branch, l;l! 21, +23) is the connection point.

Next, the operation will be explained.

First, as the vehicle travels, a travel pulse train (2) is electrically generated and input to the display 1IIJ control circuit (3). The display control circuit (3) takes this travel pulse train (2) as an argument, calculates the cumulative travel distance from the relationship between the wheel size and the pulse pitch, and controls the display element (4) to display this cumulative travel distance. do.

While driving, the microcomputer in the display control circuit (3) updates the mileage from time to time by a main program (not shown), or the 10 crumbs shown in Figure 2 are inserted into this main program. Then, after executing the program ・Ill・ in the main 10 grams, from the starting point (6) of υto in Fig. 2, sequentially move through the flocram group (7) or 1 small, and reach the ending point (J5). Then move on to the other 10 crumbs.

In program group (7), count the number of pulses 1,
In the grogram group (8), when the constant pulse number 1c corresponding to a predetermined constant distance matches the pulse number, it is detected that the vehicle has traveled a constant distance in mJ. When the number of pulses and the constant number of pulses C are -t, branch 06
) is selected and the number of times it has passed through this branch (16) is counted by memory l/-a (not shown), and memory 1 for pulse counting is then cleared to zero.70 grams group (
In 8), if there is no coincidence between ノ and Jc, the process jumps to the connection point via the branch 0η.

In the glogram group (11J, it is detected that the vehicle speed calculated based on the running pulse train (2) is greater than or equal to a predetermined constant vehicle speed υc1 and less than υc2, and the branch branch (18) is selected; otherwise, the branch is Select the branch (19) and select the connection point 03). When the branch (18) is selected, if the number of passages of the 70-g group (one is executed and the branch 06) is 1 or more, that is, if it has traveled a certain distance or more, the branch 20 is selected. ) and select a certain number of pulses corresponding to a certain distance. A value corresponding to the product of and an integer a is encoded, integrated into the contents of the memory circuit (5) in FIG. 1, and written into the circuit (5), and then the integer λ is cleared to zero. Even if the glogram group (11) detects that the vehicle speed is within the above-mentioned constant vehicle speed range, if the vehicle has not traveled a certain distance or more, the torogram group (12) detects a branch branch (
211 is selected and jumps to ) of the connection point.

Like this (in Otsumoto's actual example, vehicle speed or constant vehicle speed υ.

If it is detected that the distance is greater than or equal to υc2 and less than or equal to υc2, and at this time the vehicle is traveling a certain distance, the distance 1if is an integer multiple of the certain distance.
The information stored in IF is multiplied into a non-volatile memory circuit (5).
- Therefore, even when the battery is removed for maintenance or the like after the engine is stopped, it is possible to retain information on the cumulative mileage up to that point within the above-mentioned fixed distance error.

As described above, according to the present invention, the cumulative odometer is configured to integrate and write the odometer in the non-volatile memory circuit every time the vehicle travels a certain distance within a certain vehicle speed range.
Even if the battery is removed for assessment or inspection/maintenance, the cumulative mileage will not be lost (this has an extremely large practical effect).

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, and FIG. 2 is a flowchart of a microcomputer GLODARAM used in the display control circuit of FIG. Put away the book, (1)...run? T pulse signal, (3)
...display control circuit, 14) ...display element, (5).
...Memory circuit, (8)...10-gram group that performs a function of detecting traveling a certain distance, (II)...10-gram group that performs a function of detecting that the vehicle speed is within a certain vehicle speed range, (
15)...This is a 70g group that performs the mileage memory control function. Agent Makoto Kuzuno - Procedural amendment (voluntary) Mr. Commissioner of the License Agency 1. Indication of the case Patent application No. 57-144943 2. Name of the invention (4. Accumulated mileage meter 3. δ to be amended ZBf!l Relationship with m1 Representative Katayuni Part 4, Column 6 of the detailed explanation of the invention in the agent's specification, and the details of the amendment will be corrected as follows.

Claims (1)

[Claims] (1) A display element that numerically displays the cumulative distance traveled by the vehicle, and a display that controls the display element to calculate and display the cumulative distance traveled by inputting a pulse train electrically generated as the wheels rotate. The display control circuit is equipped with a display control circuit that stores the cumulative mileage as an electric signal and can retain the stored content even after the power supply is stopped, and the display control circuit has a memory circuit that stores the cumulative mileage as an electric signal and retains the stored content even after the power supply is stopped. a distance travel detection function; a vehicle speed detection function that detects that the vehicle speed is within a predetermined constant vehicle speed range; and the vehicle speed detection tower 8 after detecting that the vehicle has traveled a certain distance using the constant distance travel detection chess kl.
1, the cumulative travel distance is characterized by having a travel distance storage control function that causes the storage circuit to store the cumulative information that the certain distance has been traveled when it is detected that the vehicle speed is within a certain vehicle speed range. Cut.