JPH09177849A - Brake alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliable generate an alarm before a trouble develops when a trouble occurs to a brake which is brought into a heating state and to automatically release an alarm generated once when an alarm condition is not satisfied while generation of alarm is never performed whenever there is no trouble. SOLUTION: A temperature sensor 1 is arranged at each of a plurality of wheels equipped with respective brakes, a temperature difference between the plurality of the wheels is computed, and when the temperature difference, a car speed sensor output, and a continuance time of an abnormal temperature which is set when correspond to a plurality of three-dimensional alarm conditions, an alarm output is generated. Further, an alarm output generated once is automatically released by setting an automatic release condition separately from a condition on which an alarm output is fed. This constitution realizes a device, which entirely eliminates a need for a driver to effect operation and eliminate a need to be conscious of a brake alarm during normal drive operation, at a practical cost not needing a high cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a braking system for automobiles and other vehicles. TECHNICAL FIELD The present invention relates to a safety device for a brake, and relates to an improvement in a device that issues an alarm to alert the driver when the temperature of a brake member or a wheel becomes high.

[0002]

2. Description of the Related Art In recent years, in order to further improve the safety of a brake device, a brake alarm device has been widely provided for issuing an alarm when the brake shoe continuously generates heat. Many brake alarm devices detect the temperature of brake fluid, brake shoes, back panel and other brake members as electric signals with a temperature sensor,
An electric circuit is provided for issuing an alarm when the detected value rises above a certain threshold. Various measures have been taken to detect these temperatures correctly (Japanese Patent Laid-Open No. 62-180125 and others). Such a brake alarm device is an excellent device that can prevent the expansion of an abnormality such as a vapor lock when a failure occurs such that the brake is not released due to an erroneous operation or some other reason.

[0003]

SUMMARY OF THE INVENTION It is desired that such a brake warning device should correctly issue a warning under all driving conditions of a vehicle. That is, it is desirable that the alarm device operates uniformly regardless of whether it is operated in a high temperature environment or in a cold region.

If the alarm limit temperature is set low, the temperature around the wheels rises when the vehicle is continuously traveling in a high temperature environment such as an asphalt road in the middle of summer, but the temperature around the wheels rises. May occur. If a failure alarm is issued even though it is not a failure, the alarm becomes unreliable. If a failure alarm is issued and it is checked that there is no abnormality when it is inspected, the driver may ignore the alarm when it is really abnormal and the alarm is issued. . In addition, if the alarm limit temperature is set to a high value, meaningless warnings at high temperatures will almost disappear, but it will not be possible to early warning of abnormal conditions that occur immediately after starting running in cold regions. Become.

In fact, automobiles that have been sold on the market in recent years rarely have a malfunction that hinders running, and in particular, a malfunction of a brake during a running condition rarely occurs. Most vehicles will never have a brake failure that would require an alarm over the life of the vehicle. In other words, the brake alarm device is an alarm device for an abnormality that rarely occurs.However, when there is no abnormality, the alarm must not be erroneously generated, and when there is an abnormality, it is necessary to give an early and sure alarm. is there.

The present inventors have conducted various tests on the brake alarm device under such a condition. As a result, it is difficult to uniformly cover a wide temperature range available for vehicles and usage conditions by the method of setting a certain threshold value for a temperature abnormality and issuing an alarm when the threshold value is exceeded. all right. That is, in consideration of safety, the alarm temperature threshold is set to a relatively low temperature, and an abnormal alarm may occur under severe operating conditions even though it is not actually abnormal. I understood.

In order to prevent this, if an advanced device capable of finely setting the surrounding environment and operating conditions is introduced, it is desirable because it will increase the economical burden on the device for alarming a rare failure. is not. Also, imposing extra maneuvers on the driver for the brake warning device must be avoided.

The inventors also found from the results of these tests that the duration of abnormal temperature is an important factor for warning. In addition, it is appropriate to continue the alarm and let the driver inspect the equipment when the condition for generating the alarm disappears spontaneously after the alarm is generated, or the condition for generating the alarm is We considered various factors to consider whether it is appropriate to cancel the alarm when the information disappears. As a result, it was found that the condition for canceling the alarm regardless of the operation should not necessarily match the condition for sending the alarm output, and it is necessary to set it separately in order to increase the reliability of the alarm. .

The present invention has been made against such a background, and an object thereof is to provide a highly reliable alarm device. That is, it is an object of the present invention to provide a brake warning device in which a warning is reliably issued before a failure spreads when a failure occurs, and a warning is not issued when the failure does not occur. The present invention aims to provide a practically economical brake warning device. An object of the present invention is to provide a brake warning device that does not require the driver to perform any operation. An object of the present invention is to provide a device in which a driver does not need to be aware of a brake warning in normal driving operation. An object of the present invention is to set a condition for automatically canceling an alarm once generated regardless of an operation.

[0010]

SUMMARY OF THE INVENTION The present invention is characterized in that an abnormal brake occurrence is detected at an early stage to prevent damage to the brake.

That is, according to the present invention, a temperature sensor for detecting the temperature of the brake member, an arithmetic circuit for taking in the output of the temperature sensor to identify an abnormal temperature, and displaying an alarm on the driver's seat according to the alarm output of the arithmetic circuit. In the brake alarm device including an alarm indicator, the temperature sensor is provided on a plurality of wheels equipped with a brake, and the arithmetic circuit calculates a temperature difference (Td) for the plurality of wheels. Means for taking in a speed sensor output (v) of the vehicle, wherein the arithmetic circuit has the temperature difference (Td), the speed sensor output (v), and an abnormal temperature duration (t).
And a means for generating the alarm output when the three-dimensional conditions set together are met.

A plurality of the three-dimensional conditions are set, the means for generating the alarm output sends an alarm output when any of the plurality of conditions is set, and the arithmetic circuit outputs the alarm once generated. It is desirable that the condition for automatically releasing the alarm output without any operation is provided separately from the condition for sending the alarm output. When one of the temperature sensors exceeds a predetermined temperature and has an abnormally high temperature, means for generating an alarm output even if the three-dimensional condition is not satisfied can be provided.

A temperature sensor provided on each of a plurality of wheels equipped with a brake detects the temperature of each brake member, and an arithmetic circuit takes in the output thereof to indicate an abnormal temperature in any of the brake members. Identify whether there is something. If there is a brake member indicating an abnormal temperature, an alarm signal is sent to an alarm display provided in the driver's seat to display the alarm.

Since the temperature sensor is provided on all the wheels equipped with the brake, the arithmetic circuit calculates the temperature difference (Td) for the plurality of wheels, takes in the speed sensor output (v), and obtains this temperature difference. (Td) and speed sensor output (v) are combined with abnormal temperature duration (t) to determine whether or not a three-dimensional condition is met, and if so, send an alarm signal to the alarm indicator. And display an alarm.

If the three-dimensional conditions are individually set depending on the roads to be traveled, such as when traveling on a highway and on a city road, it is possible to make an accurate determination according to the road classification. A reliable alarm can be generated.

In addition to the condition for sending the alarm output, the condition for canceling the alarm is set. That is, the alarm output once generated can be automatically canceled without the driver's operation, and it is not necessary for the driver to be aware of the occurrence of the alarm and the cancellation of the generated alarm each time. .

Further, if any one of the temperature sensors exceeds the predetermined temperature and becomes an abnormally high temperature as a condition for generating an alarm, an alarm output should be generated even if the above three-dimensional condition is not satisfied. Therefore, it is possible to commonly detect an abnormality and issue an alarm regardless of the traveling roads.

By reliably detecting the abnormality of the brake in this way, it is possible to prevent the occurrence of a fault that has occurred from spreading at an early stage, and an alarm is issued even if it is not a fault. You can avoid that. Further, after the alarm condition is temporarily met, the alarm will not be continuously output when the device is restored to the normal state and is operating.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the structure and basic operation of the essential parts of the embodiment of the present invention will be described.

FIG. 1 is a diagram showing the construction of the essential parts of an embodiment of the present invention.

In the embodiment of the present invention, a temperature sensor 1 for detecting the temperature of a brake member, a calculation circuit 2 for taking an output of the temperature sensor 1 to identify an abnormal temperature, and a driver's seat according to an alarm output of the calculation circuit 2. The temperature sensor 1 is provided as a feature of the present invention.
Is provided on all wheels equipped with brakes, and the arithmetic circuit 2 includes means for calculating a temperature difference (Td) for each wheel, means for taking in the output (v) of the speed sensor 4, and the temperature difference. (Td) and the output (v) of the speed sensor 4
And means for generating an alarm output when the three-dimensional condition set together with the abnormal temperature duration (t) is met, and the arithmetic circuit 2 further includes an alarm output once generated. The condition for automatically releasing the alarm output is provided separately from the condition for outputting the alarm output.

FIG. 2 shows an example of the temperature sensor used in the first embodiment of the present invention. The temperature sensor 1 is fixed to the cover of the brake mechanism as shown in FIG. FIG. 4 is a view showing a mounting state of a thermistor type temperature sensor as another example of the temperature sensor. In addition, the alarm indicator 3 has an alarm lamp 5 for notifying the occurrence of abnormality by lighting or blinking, an alarm buzzer 6 for notifying the abnormality occurrence by sound, and a cancel for canceling the alarm occurrence from the alarm lamp 5 and the alarm buzzer 6. -Including switch 7.

Next, the basic operation of the embodiment of the present invention will be described. FIG. 5 is a flowchart showing the flow of the basic operation of the embodiment of the present invention.

The arithmetic circuit 2 takes in the outputs from the temperature sensors 1 and the vehicle speed sensors 4 and performs arithmetic operations to identify abnormal temperatures. Next, determine whether or not an alarm is currently in progress,
If the alarm is not on, it is determined whether or not the calculation result satisfies the alarm condition. If the alarm condition is satisfied, the alarm generation from the alarm lamp 5 and the alarm buzzer 6 is continued. Whether or not the alarm condition is satisfied is determined by a three-dimensional condition set for the temperature (T), the vehicle speed (v), and the abnormal temperature duration (t) identified by the arithmetic circuit 2, or the arithmetic circuit 2 performs an arithmetic operation. Temperature difference (Td) for each wheel
Three-dimensional condition set for vehicle speed (v) and abnormal temperature duration (t), or two-dimensional condition set for temperature (T) and abnormal temperature duration (t) identified by the arithmetic circuit 2. It is performed depending on whether or not any of the above applies.

If an alarm is currently being issued, it is determined whether or not the operation result of the operation circuit 2 has been the alarm stop condition. If the alarm stop condition is being satisfied, the alarm being generated is stopped. If the alarm stop condition is not satisfied, the alarm generation continues.

Here, the alarm generation and alarm stop operation will be specifically described for each of a plurality of set alarm generation conditions.

(First Embodiment) In the first embodiment of the present invention, alarm conditions are set according to temperature (T), vehicle speed (v) and duration (t) of abnormal temperature. It is a flowchart which shows the flow of operation | movement of 1st Example of invention.

The arithmetic circuit 2 takes in the outputs from the temperature sensor 1 and the vehicle speed sensor 4 and performs arithmetic operations to identify the temperature of each wheel. Next, it is determined whether or not an alarm is currently issued. If not, the calculated vehicle speed (v) is 75 km.
/ H or more is determined. Vehicle speed is 75km / h
If it is above, it is determined whether the temperature (T) of the front wheels is 125 ° C. or higher, or the temperature (T) of the rear wheels is 110 ° C. or higher. Front wheel or rear wheel temperature (T) is 125 ℃ or 11
If it exceeds 0 ° C., it is determined whether or not the duration (t) has passed one minute, and if it has passed, it is in an abnormal state and the alarm generation is continued.

If the vehicle speed does not exceed 75 km / h,
It is confirmed whether the timer is running, and if the timer is running, it is determined whether the vehicle speed is 65 km / h or less. If the vehicle speed is 65 km / h or less, it is not in an alarm state, so the timer is reset and the control is returned to the original condition. If the vehicle speed is exceeded, the temperature (T) of the front wheels or rear wheels is 1 each.
Determine if it is above 25 ° C or 110 ° C.
If one minute has passed while the temperature is exceeded, the alarm is continued because an abnormal condition has occurred.

If the temperature (T) of the front wheels is 115 ° C. or lower and the temperature (T) of the rear wheels is 100 ° C. or lower during the alarm, it is necessary to issue an alarm if the temperature is lower than that temperature. Since there is not, stop the alarm generation. If the temperature exceeds that temperature, it means that there is an abnormal condition and the alarm continues to be issued.

The first embodiment is suitable for traveling on a highway.

(Second Embodiment) In the second embodiment of the present invention, an alarm condition is set by the temperature difference (Td), the vehicle speed (v) and the abnormal temperature duration (t) for each wheel. FIG. 7 is a flow chart showing the flow of operation of the second embodiment of the present invention.

The arithmetic circuit 2 takes in the outputs from the temperature sensor 1 and the vehicle speed sensor 4 and calculates the temperature difference (Td) between the front and rear wheels. Next, it is determined whether or not an alarm is currently issued, and if not, the calculated vehicle speed (v)
Is 45 km / h or higher. Vehicle speed is 4
If it is 5 km / h or more, it is determined whether the temperature difference (Td) between the left and right front wheels or the left and right rear wheels is 50 ° C. or more. If the temperature difference (Td) is 50 ° C. or more, it is determined whether the duration (t) has passed 1 minute. If it has passed, the alarm is continued because it is in an abnormal state.

If the vehicle speed does not exceed 45 km / h,
It is confirmed whether the timer is running, and if the timer is running, it is determined whether the vehicle speed is 35 km / h or less. If the vehicle speed is 35 km / h or less, no alarm is required, so the timer is reset and control is returned to the original condition. If the vehicle speed is exceeded, the temperature difference between the front and rear wheels (T
It is determined whether each of d) exceeds 50 ° C.
If 1 minute has passed while the temperature difference is exceeded, the alarm is continued because it is in an abnormal state.

If the temperature difference (Td) between the front wheels and the rear wheels is 45 ° C. or less during the alarm, it is not necessary to issue an alarm if the temperature difference is below the temperature difference. To stop. If it is not below the temperature difference, it is in an abnormal state and the alarm is continued.

The case of the second embodiment is suitable for driving on a normal road in an urban area.

(Third Embodiment) In the third embodiment of the present invention, an alarm condition is set according to the temperature (T) of each wheel, and FIG. 8 is a flow chart showing the flow of operation of the third embodiment of the present invention. is there.

The arithmetic circuit 2 takes in the output of the temperature sensor 1 and performs an arithmetic operation to identify the abnormal temperature of each wheel. Then
It is determined whether an alarm is currently issued. If not, it is determined whether the rear wheel temperature is 140 ° C. or higher. If the temperature of the rear wheels does not exceed 140 ℃, the temperature of the front wheels will be 1
It is determined whether the temperature is 35 ° C. or higher. Front wheel temperature is 13
If the temperature does not exceed 5 ° C, there is no abnormal condition and the process is returned to the original condition. If the temperature of the rear wheels exceeds 140 ° C. or the temperature of the front wheels exceeds 135 ° C. for 1 minute or more, the alarm is continued because it is in an abnormal state.

If the alarm is currently being issued, it is determined whether the temperature of the rear wheels is 130 ° C. or lower and the temperature of the front wheels is 125 ° C. or lower. If the temperature of the rear wheels exceeds 130 ° C. or the temperature of the front wheels exceeds 125 ° C. for 1 minute, it is in an abnormal state and the alarm is continued. If the temperature of the rear wheels is 130 ° C. or lower and the temperature of the front wheels is 125 ° C. or lower, it means that there is no abnormal state and the alarm generation is stopped.

Since the alarm condition is limited to the temperature in the third embodiment, it can be commonly used for both highways and ordinary roads in urban areas.

[0042]

As described above, according to the present invention, at a practical cost that does not require a large amount of money, when a brake failure occurs, an alarm can be reliably generated before the failure expands. At the same time, it is possible to prevent the alarm from being issued when it is not a failure, and it is possible to enhance the reliability of the alarm. Furthermore, since the condition for releasing the alarm once generated is automatically set regardless of the driver's operation, it is possible to prevent the driver from being aware of the generation and release of the brake alarm each time.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a main part of an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a temperature sensor used in an embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing a mounted state of the temperature sensor in the embodiment of the present invention.

FIG. 4 is a partial sectional view showing a mounting state of another temperature sensor according to the embodiment of the present invention.

FIG. 5 is a flowchart showing the flow of basic operation of the embodiment of the present invention.

FIG. 6 is a flowchart showing the flow of the operation of the first embodiment of the present invention.

FIG. 7 is a flowchart showing the flow of operation of the second embodiment of the present invention.

FIG. 8 is a flowchart showing the flow of operations of the third embodiment of the present invention.

[Explanation of symbols]

 1 temperature sensor 2 arithmetic circuit 3 alarm indicator 4 vehicle speed sensor 5 alarm lamp 6 alarm buzzer 7 cancel switch

Claims (4)

[Claims] 1. A temperature sensor for detecting a temperature of a brake member, an arithmetic circuit for taking an output of the temperature sensor to identify an abnormal temperature, and an alarm indicator for displaying an alarm on a driver's seat according to an alarm output of the arithmetic circuit. The temperature sensor is provided on a plurality of wheels equipped with a brake, and the arithmetic circuit includes a temperature difference (T) for the plurality of wheels.
d) and means for taking in the speed sensor output (v) of the vehicle, wherein the calculation circuit has the temperature difference (Td), the speed sensor output (v), and continuation of an abnormal temperature. A brake alarm device comprising means for generating the alarm output when a three-dimensional condition set together with time (t) is met. 2. The brake alarm device according to claim 1, wherein a plurality of the three-dimensional conditions are set, and the means for generating the alarm output sends an alarm output when any of the plurality of set conditions is met. . 3. The brake alarm device according to claim 1, wherein the arithmetic circuit is provided with a condition for automatically canceling the alarm output once generated without operating, separately from a condition for transmitting the alarm output. . 4. The brake warning device according to claim 1, further comprising means for generating a warning output even when one of the temperature sensors exceeds a predetermined temperature and has an abnormally high temperature even if the three-dimensional condition is not satisfied.