JPS58189511A - Running distance display - Google Patents

Abstract

PURPOSE:To hold exactly a running distance, by detecting a fact that a vehicle runs exceeding a specified distance, and also writing the information of the running distance in a storing circuit when a car speed becomes zero. CONSTITUTION:A signal 1 generated electrically by following a rotation of a wheel of a vehicle is inputted to a running pulse train 2, and a running distance is displayed in figures on a display element 4 by a display controlling circuit 3. In this way, the running distance is displayed in figures. Also, the running distance is stored in a storing circuit 5, as an electric signal, and even after the feed is stopped, the stored contents can be held.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic device such as an odometer, that is, a cumulative mileage meter, for vehicles such as cars.

Conventionally, mechanical odometers have been widely used as this type of odometer, which transmits the rotation of the vehicle's heavy wheels via a transmission shaft to the odometer built into the instrument panel. A drum with numbers engraved on it is rotated to display the distance traveled.Recently, there has been rapid progress in the electronicization of vehicle instrument panels, including speedometers, tachometers, fuel gauges, water temperature gauges, etc. However, traditional mechanical meters are being replaced by electronic meters using fluorescent display tubes, light emitting diodes, etc. Under these circumstances, the trip meter, which is one type of odometer, has been computerized from an early stage. The odometer, which is also a type of odometer, is used as a guide for assessment and inspection and maintenance because it displays the cumulative mileage since the vehicle was manufactured. There is a technically difficult problem in that the memory of the distance traveled disappears when the battery is removed, and this has made it difficult for the vehicle to be widely used.

The present invention has been made in order to eliminate the drawbacks of the conventional ones as described above, and includes a display element that displays the total distance traveled by a vehicle, and a pulse train that is electrically generated as the wheels of the vehicle rotate. a display control circuit that controls the display element so as to input, calculate and display the cumulative travel distance; and a memory circuit that stores the cumulative travel distance as an electrical signal and retains the stored contents even after power supply is stopped. a fixed distance travel detection means for detecting whether the vehicle has traveled a predetermined distance; a vehicle speed detection means for detecting when the speed of the vehicle has become zero; and a vehicle speed detection means for detecting whether the vehicle has traveled a predetermined distance; and mileage storage control means for storing in the storage circuit the fact that the vehicle has traveled the certain distance when the vehicle speed detection means detects that the vehicle speed has reached zero. It is an object of the present invention to provide a mileage display device which has the following features and can memorize and retain the distance traveled up to that point even when power supply is temporarily cut off.

Hereinafter, a diagram illustrating an embodiment of the present invention will be described.

FIG. 1 is a schematic configuration diagram showing a mileage display device which is an embodiment of the present invention, and FIG. 2 is a flowchart of an instruction program of a microcomputer used in the display control circuit of the mileage display device shown in FIG. be. In Figure 1,
1 is a signal of the running pulse train 2 which is generated in a drowsy manner as the wheels of the vehicle (not shown) rotate; 3 is a display control circuit that numerically displays the distance traveled on the display element l; This is a memory circuit that stores data as electrical signals and can retain the stored contents even after the power supply is stopped. In FIG. 2, B is the starting point of the program group 7 to lt, and 7 is the first memory (not shown) that stores the pulse number ty of the running pulse train 2, which is incremented by one each time the running pulse train λ is input. a program group for counting pulses; l is a program group serving as a constant distance travel detection means for detecting that a constant travel pulse number tC corresponding to a predetermined travel distance matches the pulse number t; 9 is a program group that counts the number of times the pulse numbers match in program group l using a second memory (not shown), IO is a program group that clears the first memory to zero, // is when the vehicle speed V has become zero A program group called vehicle speed detection means E for various detections, 12
/3 is a program group for determining whether the second memory is 1 or more, and /3 is a mileage distance that causes the memory circuit j shown in FIG. A program group serving as a storage control means, ia a program group for zero-clearing the second memory, lj an end point of each program group 7 to /4L, 16 to 1 a branch, n and force a connection point.

Next, the operation of the mileage display device shown in FIG. 1 will be explained with reference to FIG. 2. First, as the vehicle runs, a running pulse train 2 is electrically generated and the display control circuit 3
is man-powered. The display control circuit 3 counts this running pulse train, calculates the running distance from the relationship between the size of the wheel and the pulse pitch of the running pulse train, and displays the running distance by controlling the display element IIf. While the vehicle is running, the microcomputer in the display control circuit 3 analyzes the mileage from time to time using a main program (not shown). is inserted, and after executing other programs in the main program, each program group 7 to /q is executed sequentially from the starting point 6 in FIG. Move on to the program. In program group 7, the number of pulses t is counted, and program group! Then, when the constant travel pulse tllc corresponding to a predetermined constant distance matches the pulse number t, it is detected that the vehicle has traveled the constant distance.

When the number of pulses l and the number of constant running pulses tc match, a branch /j is selected, and the number of times a has passed through this branch ibf is counted by the second memory, and then the first memo IJ for pulse counting is stored. Clear k zero. In the program group t, when the number of pulses t and tc do not match, the program jumps to the connection point U via the branch 77. In the program group l/, when it is detected that the vehicle speed V calculated based on the traveling pulse train 2 has become zero, the branch /lik is selected, and if not, the branch 19 is selected and the program jumps to the connection point list.

When the branch /l is selected, the program group 12 is executed, and if the number of times a of the branch 16 is passed is 1 or more, that is, if the branch J has traveled a certain distance or more, the branch J is selected. , a value corresponding to the product of a constant number of traveling pulses pc corresponding to a constant distance and the above-mentioned number of times a is encoded and written into the memory circuit sit shown in FIG. 1, and then the above-mentioned number of times aQ is cleared to zero. On the other hand, even if the program group /l detects that the vehicle speed V has become zero, if the vehicle has not traveled a certain distance or more, the program group /l selects the branch branch ``l'' and jumps to the connection point phantom.

As mentioned above, when it is detected that the vehicle speed V is zero, information corresponding to a distance that is an integral multiple of a certain distance is stored in the non-volatile memory circuit jKl. Even when the patch IJ is removed, it is possible to retain information on the distance traveled up to that point within a predetermined distance error. In addition, since writing to the memory circuit j is performed when the vehicle speed V is zero, that is, while the vehicle is stopped, battery terminals and relay connector terminals may be temporarily disconnected due to photographing while the heavy vehicle is moving. Alternatively, if this separation occurs while writing to the memory circuit 3, there is no risk of unreliable data transfer such as not being able to guarantee data writing, and the mileage information can be safely and reliably written to the memory circuit S. It becomes possible to write.

As described above, according to the mileage display device according to the present invention, it is possible to detect that the vehicle has traveled a certain distance or more, and to write information on the mileage into the memory circuit when the vehicle speed becomes zero. This configuration has the excellent effect of providing a computerized odometer that can extremely reliably retain mileage information even if the power supply from the battery is temporarily cut off. It is something to play.

[Brief explanation of the drawing]

, X/ is a schematic configuration diagram showing a mileage IM display device which is an embodiment of the present invention, and FIG. It is a flowchart. l...Signal, 2...Travel pulse train, 2...Display control circuit, D...Display element, j...Storage circuit, 7 to /q...Program group. Agent Shin Kuzuno −

Claims (1)

[Scope of Claims] A display element that displays the cumulative distance traveled by a vehicle in numbers, and a pulse train electrically generated as the wheels of the vehicle rotate to calculate and display the cumulative distance traveled. , a display control circuit that controls the display element; a memory circuit that stores the cumulative travel distance as an electrical signal and retains the stored content even after the power supply is stopped; and detects that a predetermined distance has been traveled. a certain distance traveling detection means;
a vehicle speed detection means for detecting whether the speed of the front-loaded vehicle has become zero; and a vehicle speed detection means for detecting that the vehicle has traveled a certain distance by the fixed distance traveling detection means; A mileage display device comprising: a mileage storage control means for causing the memory circuit to memorize that the predetermined distance has been traveled when the distance is detected.