JPS583048Y2 - Interval alarm device - Google Patents

Description

[Detailed description of the invention] The present invention relates to an interval warning device that warns the driver of the periodic replacement period and periodic inspection period of various parts of the automobile. This can be used to issue an alarm to notify the driver after the vehicle has traveled a certain distance.

Taking an example of an exhaust gas recirculation device, this is a device that recirculates a portion of exhaust gas from an intake system in order to reduce nitrogen oxides (NOx) in the exhaust gas of a vehicle.

However, if this exhaust gas recirculation device is used for a long time, inorganic substances and other impurities in the exhaust gas will stick to the seat surface of the exhaust gas recirculation valve, reducing the recirculation rate and causing the risk that the initial purpose will not be achieved. Therefore, it becomes necessary to replace the exhaust recirculation valve after the car has been driven for a certain distance.

In addition to the above-mentioned exhaust gas recirculation valves, automobiles have various legally required periodic replacement parts and service replacement parts. The equipment shown in Figure 1 was used.

In FIG. 1, the part surrounded by a dashed line is a detector 4 that detects when the car has traveled a certain distance.
1 is a battery, 22 is a key switch which is also connected to other loads (not shown), 3 is a fuse, 5 is a starter motor, and 6 is a warning lamp.

A cam 16 connected to rotate in proportion to the number of revolutions of the speedometer cable 17 connected to the speed outlet 18.
Accordingly, contacts 14 and 15 are configured to turn on, for example, every time the car travels 400 m.

While the vehicle is running, the key switch 2 is located on the ignition terminal 2a side, and each time the contacts 14 and 15 are turned on, the solenoid 13 in the detector 4 is activated to attract the movable piece 12.

The movement of the movable piece 12 is regulated by a spring 12', and it rotates about a fulcrum 12'.

The counter wheel 11 adds up the count number by 1 each time the movable piece 12 is attracted, and when it reaches a predetermined cumulative count number, that is, a predetermined travel distance, the counter wheel 11 mechanically closes the contact point 9.
10 is closed and the alarm lamp 6 lights up.

In this case, since the diode 7 is inserted, the current from the contacts 9 and 10 is blocked and the starter motor 5 is not driven.

8 is a reset button that mechanically opens contacts 9 and 10;
It functions to return the counter wheel 11 to the zero position.

Further, when the engine is started by turning the key switch 2 to the starter terminal 2b side, it is possible to check whether the warning lamp 6 is burnt out.

However, the above conventional device has the following problems.

That is, the operating sound of the solenoid 13 is generated every time the vehicle travels a certain distance, and this sound becomes faster as the vehicle travels at higher speeds, and this sound resonates with the body etc., giving an unpleasant feeling.

Furthermore, if the claws of the movable piece 12 wear out, there is a risk of miscounting.

Furthermore, there was a risk that the tureenoid 13 would malfunction due to voltage fluctuations, etc.

All of these results in delaying the warning timing.

Conversely, if the sentry vehicle is stopped in a closed state where the cam 16 closes the contacts 14 and 15, the count advances by 1 when the key switch 2 is turned on and off, which results in an earlier warning.

Furthermore, since an alarm integration counter is required separately from the odometer, counters of the same mechanism are duplicated, which is wasteful.

Further, the mechanism for returning the wheel 11 of the gear type counter to zero is complicated.

Furthermore, in addition to the mechanical problems mentioned above, conventional devices have a fixed cumulative mileage setting, resulting in poor compatibility with parts that require different replacement or inspection periods, resulting in a lack of versatility. .

The present invention has been developed with these points in mind, and it is an object of the present invention to provide an interval warning time point that allows the setting of the cumulative travel distance for warning to be changed arbitrarily.

゛The feature of this invention is that it utilizes the gear type counter installed in automobiles as an odometer, and uses a variable resistor whose resistance value changes in conjunction with the counter shaft of the ladder, and a reset function for variable resistance value setting. A Wheatstone bridge circuit is constructed with four sides consisting of a second fixed resistor with a fixed resistance value, and the voltage between the equilibrium points of this bridge circuit is detected and an output is generated when the equilibrium condition is established. A balance detector is provided, and an alarm is driven by the output of this detector.

The present invention will be explained below with reference to the drawings.

FIG. 2 is an explanatory diagram of the Wheatstone bridge circuit.

a, b are fixed resistors with known resistance values, R is a variable resistor, X
are resistors to be measured, and a DC voltage E is applied between one diagonal point of a bridge circuit with these resistors as four sides, and a galvanometer G is inserted between the other diagonal points.

Close switches SW1 and SW2, adjust the resistance value of variable resistor R, and when the deflection of galvanometer G becomes negative, b/a
The relationship =X/R holds true.

The well-known Wheatstone bridge circuit determines the resistance value X using this method.

The present invention utilizes this bridge circuit and sets the point in time when the equilibrium condition is established as the point in time for one interval alarm.

In other words, variable resistor R is used as a reset resistor and a certain resistance value is set there, and resistor X is a variable resistor whose resistance value changes in conjunction with the totalizing wheel of the car's odometer. With a configuration using a resistor, the current flowing through the galvanometer circuit of this bridge circuit is detected, and the alarm is generated when an equilibrium condition is established, that is, when no current flows through the galvanometer circuit.

FIG. 3 is a circuit diagram of one embodiment of the present invention.

Reference numeral 30 in FIG. 3A is a gear type counter that cumulatively counts the mileage of the automobile, and each digit wheel 31.3 is connected to a gear wheel 41.42 driven by a speedometer cable 40.
2. . . . are sequentially driven and the distance traveled is added up.

31 is a digit wheel in 1/10 Km units, 32 is a digit wheel in 1 Km units, 36 is 10.000 k
It is a digit wheel in m units.

37 is a drive shaft of the counter 30.

A variable resistor X is attached to rotate in conjunction with the rotation of the digit wheel 36.

38 is its contact piece, and 39 is a variable resistor.

3, 20 is a bridge circuit, 21 is an equilibrium detector that detects the establishment of the equilibrium condition of the bridge circuit, generates an output, and lights up the alarm lamp 6; 22 is a stabilizer for the bridge circuit; It has seven paths between power sources and is equipped with an opening/closing mechanism as well as supplying power.

A, 1) is a fixed resistor of the bridge circuit, R is a reset resistor, and the resistance value can be set variably like R1, R2, . . . .

Now, set the resistance value of the reset resistor R to the minimum setting value R.
Suppose that it is set to 1.

As the mileage of the car increases, the resistance value of the variable resistor X rotating in conjunction with the wheel 36 of the integration counter 30 changes and reaches the resistance value X1 at the time corresponding to the first interval. The relationship l)/a = lights up.

Next, when the setting of the reset resistor R is changed to the next setting position R2, the equilibrium condition of the bridge circuit 20 is no longer satisfied, and as a result, the output from the equilibrium detector 21 disappears, and the lighting of the alarm lamp 6 is stopped. .

When the distance traveled gradually increases and the resistance value of variable resistor X reaches the resistance value at the time corresponding to the second interval,
The relationship b/a =

When the reset resistor R is further moved to the next setting position R3, the equilibrium condition of the bridge circuit is no longer satisfied, and the alarm lamp 6 is turned off.

By repeating the above operations, when the integration counter is driven in conjunction with the integration counter, the position of the variable resistor X with respect to the contact piece 38 moves, and the resistance values XI, X2, etc. of the variable resistor X are moved.・・・
... are the set resistance values R1, R2, of the reset resistor R,
For ......, the above-mentioned constant relationship b/a=X1/
R1,b/a=X2/R2, and when a predetermined distance is reached, the alarm lamp 6 lights up.

For example, when configuring an interval alarm every 20,000 km, the variable resistor
The resistance value of the reset resistor R may be set to 115 by interlocking with the digit wheel 36 in units of m.
When configuring an interval alarm for every 00 km, the variable resistor X may be similarly linked to the digit wheel 36 and set to 1/10 of the resistance value of the reset resistor R.

With such a configuration, the alarm error for the set distance can be suppressed to the minimum order, that is, 0.1 km, and it is also possible to reduce the error.

In the above example, the variable resistor X is 10,000k.
The case shown here is a case in which it is linked with a digit wheel of m unit, but it may be linked with a digit wheel of another unit.

Furthermore, a warning buzzer or the like may be used as the warning lamp.

According to the present invention, there is no solenoid operating sound as in conventional devices, and the odometer that is conventionally equipped in automobiles can be used as is, so there is no need to install a separate cumulative counter, and the vehicle can be driven without installing a complicated reset mechanism. The system automatically returns to the reset position once the distance meter has completed one cycle, making it possible to reduce costs, and the addition of a bridge circuit improves alarm accuracy, and the cumulative mileage that requires an alarm can be set arbitrarily. This has the advantage that it can be applied to interval alarms for various parts.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a conventional device, FIG. 2 is a general explanatory diagram of a Wheatstone bridge circuit used in the present invention, and FIG. 3 is an explanatory diagram of an embodiment of the present invention. Explanation of symbols 6...Warning lamp, 20...
・・Hobby 5 Tostone Bridge Circuit, 21・・・・・・
Equilibrium detector, 30...Integration counter, 31-3
6... Digit wheel, 37... Drive shaft,
38...Contact piece, 39...Variable resistor, 40...Speedometer cable, 41.42...
...Gear, X...Variable resistor, R...
・Reset resistor.

Claims (1)

[Scope of utility model registration request] A Wheatstone bridge circuit consisting of a variable resistor whose resistance value changes in conjunction with the axis of a gear-type power booster that integrates the distance traveled by a car, a reset resistor whose resistance value can be set variable, and two fixed resistors. and an equilibrium detector that detects the voltage between the equilibrium points of the bridge circuit and generates an output when the equilibrium condition is established, and an alarm that is driven by the output of this detector. An interval alarm device that is characterized by generating an alarm.