JPS6243239B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a warning device for a motor vehicle, and more particularly to a warning device that displays and warns when it is time to inspect or replace at least one component depending on the distance traveled. In order to ensure safety and economy when driving a car, it is necessary to inspect and replace parts according to the cumulative mileage, as disclosed in, for example, Japanese Patent Laid-Open No. 52-22241. Examples include changing engine oil, rotating and replacing tires, etc.

If these inspections, replacements, etc. are neglected, a serious accident may occur or the vehicle may have to be operated uneconomically. Generally, the replacement period and inspection period are determined depending on the car model, and these are stated in the instruction manual distributed at the time of car purchase. However, if you use your car frequently, you may often forget or lose the instruction manual, making it difficult to know when to inspect or replace it.

An object of the present invention is to provide an alarm device that prevents the above-mentioned problems, gives instructions to the user of a vehicle regarding appropriate inspection and replacement timing, and promotes safe and economical use of the vehicle.

In order to achieve the above object, the present invention provides a distance signal generator that outputs a pulse train signal with a number of pulses corresponding to the distance traveled in conjunction with a travel speedometer of an automobile, and Counts and stores the distance, and when the distance traveled by the vehicle exceeds the reference distance determined for at least one display item, it issues a control signal to display the corresponding display item and issue a warning. A control device for outputting, a logic gate group provided corresponding to at least one control output of the control device, and a display device provided corresponding to the output of the logic gate group and having a character pattern. and an alarm device, a rectangular wave signal generator for displaying or issuing an alarm in synchronization with a control signal of the control device, and a reset switch for erasing the stored contents of mileage data of the control device. It is characterized by:

Next, one embodiment of the present invention will be described based on the accompanying drawings.

In FIG. 1, an input terminal _I1 of a microcomputer 1 is provided with a traveling speedometer 3.
Logic “0”, “1” every certain mileage in conjunction with
A pulse train signal from a distance signal generator 5 that outputs a signal is input. At least one of the other inputs (for example, I ₂ ) receives a reset signal for erasing cumulative mileage data, which will be described later, and this signal is generated by reset switch 7 and resistor 9. Further, an output signal generated when the ignition switch 11 is turned on is input to the input terminal _I3 .

On the other hand, multiple output terminals of microcomputer 1
_O1 to _Oo are connected to one input terminal of each of a group of two-input exclusive OR (hereinafter referred to as EOR gate terminals) gates 13-1 to 13-n provided corresponding to these output terminals. ing. Applicable
The other input terminal of the EOR group 13 is connected to receive an output signal of a rectangular wave signal generator 15 having an appropriate frequency.

Here, a display device 1 using liquid crystal as a display element
7 displays a character pattern of multiple items corresponding to the output of the logic gate group, which indicates when to inspect or replace parts, and corresponds to each output of the EOR gate group. will be displayed. That is, the output terminal of the signal generator 15 is directly connected to the common electrode 17a of the liquid crystal display device 17, and the output terminals of the EOR gate group are connected to the character electrodes in a one-to-one correspondence. Therefore, for example, when the output terminal _O1 of the microcomputer 1 becomes a logic "1" level, the EOR gate 1
The output signal 3-1 is an inverted output from the output signal of the signal generator 15 applied to the common electrode, and an electric field is applied to the part of the character pattern ENG.OIL that indicates the time to replace the engine oil. is displayed.

An AND circuit 19 performs AND logic on the control signal sent from the output terminal _Ow , which is different from the output terminals _O1 to _Oo of the microcomputer, and the output signal of the signal generator 15, and outputs this output signal. amplifier 2
1 to drive the alarm buzzer 23.When the ignition switch 11 is turned on, the output terminal _Ow is amplified by
When an instruction to replace the battery is given, the logic level is set to "1" for a certain period of time and the buzzer 23 sounds to notify the driver.

As a power source, the microcomputer 1 is supplied with power from a battery 25 of the automobile directly through a constant voltage circuit 27 and a diode 29. Furthermore, a backup power source 31 is provided and is used to retain data when the battery 25 is removed.

Next, a general flowchart showing the processing procedure of the microcomputer 1 is shown in FIGS. 2a to 2c.

First, since most of the processing time of the microcomputer 1 is spent on calculating the distance traveled by the car, this distance calculation becomes the main routine. In FIG. 2a, in step _S1 , it is determined whether the distance signal has a logic level of "1" or "0", and the number of times the distance signal has become a logic "1" is added up. Next, the number added in step S ₂ is 1 km.
It is determined whether the number corresponds to the distance traveled, and in step _S3 , when the distance reaches 1 km, each random access memory (hereinafter referred to as RAM) area stores the distance traveled to determine when to change the engine oil. 1 is added to the RAM area for storage, RAM area for tire rotation, etc.

On the other hand, an interrupt is made at regular intervals to check whether the contents of each RAM have reached the time for inspection or replacement of parts or not, based on the standard mileage determined for each display item (which may vary depending on each display item). )
The actual mileage data (stored sequentially in each RAM) are compared, and judgments are made sequentially. In FIG. 2b, first, an interrupt is applied in step _S11 ,
For example, it is determined whether the contents of RAM ₁ indicate that it is time to replace the engine oil (step _S12 ).
If the replacement time has not yet been reached, a logic "0" signal is output to the output terminal _O1 and the process proceeds to the next item determination (step _S13 ); if the replacement time has been reached, the output terminal
A logic " ₁ " signal is output to O1 for a fixed period of time (for example, once every 5 seconds for 0.5 seconds) (step _S14 ). Then, the character pattern "ENG.OIL" is periodically displayed on the liquid crystal display device 17.

Next, in step _S14 , it is determined whether the signal input to the input terminal _I2 is logic "1" or "0", that is, whether the reset switch 7
is ON or OFF (step _S15 ). If the switch 7 is OFF, the process proceeds directly to determining the next item, and if it is ON, it is determined whether the output _O1 is "1" or "0", that is, whether it is displayed (step
_S16 ). If it is not displayed, the process advances to the next item, and if it is displayed, the contents of RAM ₁ are erased and the process proceeds to the next item (step _S17 ). below
The processing for RAM ₂ to RAM _o is the same and will therefore be omitted. Therefore, if a car user changes the engine oil, he or she should look at the display and turn on the reset switch when ENG.OIL appears on the display.
The mileage data in RAM ₁ will be erased and will not be displayed until the next time for replacement. This operation is performed sequentially according to each item. If all items require inspection or replacement, the display unit 17 will display “ENG.OIL”.
Starting from , the lights are turned on sequentially and circulate.

This interrupt may be performed externally at fixed time intervals, or may be performed using an internal timer.

Here, in case the driver does not notice, if the ignition key is turned on, there is a need for inspection.
If even one item requires replacement, a warning buzzer sounds for a certain period of time to warn the driver. A separate interrupt routine is provided for this purpose. That is, as shown in Fig. 2c, when a logic "1" signal is input to the interrupt input terminal _I3 , it is determined whether the stored contents of the RAM of each item have reached the time when parts need to be inspected or replaced.
Judgments are made sequentially from RAM ₁ to RAM _o (steps S ₂₁ to
S _o ), if there is even one point on the way, a logic "1" signal is output for a certain period of time from the alarm output terminal O _w (step S
_o+1 ).

Note that the display may be left open as long as the same number of reset switches as the number of outputs are provided.

As described above, according to the present invention, it is possible to automatically determine when to regularly inspect a vehicle or replace parts, thereby ensuring safety and economical efficiency in driving a vehicle.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the alarm device according to the present invention, FIGS. 2a to 2c are flowcharts showing the processing procedure of the microcomputer in FIG. 1, and FIG. 2a is a main routine, 2
Figure b shows an interrupt routine, and Figure 2c shows another interrupt routine.

Claims (1)

[Scope of Claims] 1. An alarm device that indicates and warns when it is time to inspect or replace at least one part used in a vehicle, which is linked to the travel speed of the vehicle and is responsive to the distance traveled. A distance signal generator that outputs a pulse train signal of a number of pulses, and a distance signal generator that receives a signal from the signal generator to count and store the distance traveled, and the distance traveled by the vehicle is determined for at least one or more display items. A control device that outputs a control signal for displaying relevant display items and issuing a warning when the standard mileage is exceeded, and logic provided corresponding to at least one or more control outputs of the control device. a gate group, a display device and an alarm device having character patterns provided corresponding to the output of the logic gate group, and a rectangular wave signal generator for displaying or giving an alarm in synchronization with a control signal of the control device. and a reset switch for erasing the stored content of mileage data of the control device. 2. The control device has a memory circuit capable of storing and erasing at least one mileage, and a set value corresponding to a reference mileage corresponding to each of the memory circuits, and when the memory value of the memory circuit exceeds the set value. 2. The alarm device according to claim 1, wherein the alarm device outputs a control signal for displaying and giving an alarm when the alarm temperature has deteriorated. 3 The main routine is to count the mileage and store the counting results in each of the memory circuits, and also performs comparisons with respective set values corresponding to the memory circuits, output control, erasing the memory contents of the memory circuits, etc. 3. The alarm device according to claim 2, wherein the control device is operated as an interrupt routine. 4. The alarm device according to claim 2, wherein items requiring inspection or replacement of parts are displayed for a certain period of time. 5 Turn on the reset switch while the display device is displaying
5. The alarm device according to claim 4, wherein by doing so, the mileage data stored in the storage circuit corresponding to the display item is erased.