JPH1044976A - Brake overheat alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inform a driver of the overheat of brakes caused by excessive use of the brake by comparing the difference between the brake temperature measured by a temperature sensor and the brake temperature measured after the prescribed time is elapsed with the preset value, and generating an alarm depending on the result. SOLUTION: Temperature sensors 4a-4d to measure the atmospheric temperature of brakes are mounted e.g. in a dust cover of the brakes of tires 2a-2d. The atmospheric temperature in each brake and the vehicle speed respectively measured by the temperature sensors 4a-4d and a vehicle speed sensor 3 are stored in a storage and operation device 5. The stored temperature is compared with the alarm temperature which is preset in the storage and operation device 5 for each vehicle speed. When the atmospheric temperature reaches the alarm temperature, it is judged to be the overheat of the brakes caused by the excessive use of the brake. Overheat of the brakes is notified to the driver by an alarm buzzer 6 or an alarm lamp 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake overheating alarm device, and more particularly to a brake overheating alarm device for notifying a driver of overheating due to excessive use of a brake of a vehicle or overheating due to dragging of a brake.

[0002]

2. Description of the Related Art Conventionally, a brake drag warning device has been disclosed in Japanese Utility Model Laid-Open No. 4-112163 and Japanese Utility Model Laid-Open No. 6-2214.
No. 4 is known.

[0003]

However, the above prior art does not notify the driver of overheating of the brake due to excessive use of the brake or overheating due to dragging of the brake, and therefore does not correspond to the actual operation. Absent.

For example, when a drag failure occurs in one of the four wheels or one of the four wheels, the temperature of only the brake being dragged increases, and the braking force decreases. At this time, if sudden braking is performed, there is a possibility that the vehicle body may skid and spin, but such a situation cannot be grasped with the conventional one.

The present invention has been made to eliminate the above disadvantages.

[0006]

According to the present invention, there is provided a brake overheating alarm apparatus comprising: a temperature sensor for measuring a temperature of a tire brake; a brake temperature measured by the temperature sensor; Means for comparing the difference from the temperature with a preset value, and means for generating an alarm based on the result of the comparison.

The temperature is measured while the brake is being operated or the brake is off.

[0008] Further, the brake overheat alarm device of the present invention comprises:
When the brakes are OFF, a temperature sensor for measuring the temperature of the brakes of the plurality of tires, and a temperature of the brakes measured by the temperature sensors obtained for the brakes of the respective tires and the temperature of the brakes measured after a lapse of a certain time from this. It comprises means for calculating the difference, means for comparing the temperature differences of the brakes of the respective tires with each other, and comparing the difference with a preset value, and means for generating an alarm based on the result of the comparison.

The above-mentioned preset value is determined for each vehicle speed. The temperature sensor is mounted inside the brake dust cover and measures the ambient temperature of the brake.

[0010]

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

FIG. 1 shows a brake overheating alarm system according to the present invention, wherein 1 denotes a vehicle, and 2a to 2d denote left front wheels (FLT), right front wheels (FRT), and rear left wheels (RL) of the vehicle 1, respectively.
T), right rear wheel (RRT), and 3 are vehicle speed sensors.

In the present invention, each of the above tires 2a to 2d
For example, temperature sensors 4a to 4d for measuring the ambient temperature of the brakes are installed in a dust cover of the brake, and the atmospheric temperature and the vehicle speed in each brake measured by the temperature sensors 4a to 4d and the vehicle speed sensor 3 are stored and processed by the arithmetic unit 5. And compares the stored temperature with an alarm temperature previously set for each vehicle speed in the storage arithmetic unit 5. If the ambient temperature has reached the alarm temperature, the brake due to excessive use of the brake is used. Is determined, and the driver is notified of the overheating of the brake by the alarm buzzer 6, the alarm lamp 7, and the like.

Reference numeral 8 denotes a buzzer 0FF switch, and reference numeral 9 denotes a brake pedal switch.

The temperature sensor may be embedded in the brake lining, but in this case, there is a problem that the temperature sensor must be replaced every time the lining is replaced.

Although it is conceivable to embed a temperature sensor in the brake drum in place of the brake lining, a slip ring,
A mechanism for transmitting temperature information of the rotating body such as a telemeter is required, so that the mechanism is complicated, and there is a problem in reliability.

It is also conceivable to attach a temperature sensor inside the brake instead of the brake lining and substitute the ambient temperature as the brake temperature, but there is a problem that the accuracy of the overheat alarm is deteriorated due to the influence of the inflow of wind. Therefore, it is preferable to mount it inside the dust cover of the brake as described above.

As shown in FIG. 2, the alarm temperature is set lower when the vehicle speed is high.

As shown in FIG. 3, the alarm buzzer 6 is manually turned on by the buzzer OFF switch 8 after the operation thereof.
Although it is FF, it is preferable that the warning lamp 7 is turned off after all the brakes are overheated.

Further, when the brake overheating alarm device of the present invention judges whether the brakes are overheated due to the drag of the brakes of the individual tires,
At the same time when the brake pedal switch 9 is turned off, the ambient temperature in the brake is measured by the temperature sensor and stored in the storage arithmetic unit 5, and the brake is turned off from the off state.
For example, after 30 seconds, the ambient temperature in the brake is measured, compared with the previous ambient temperature by the storage operation device 5, and the difference is calculated. The temperature difference is, for example, 20 ° C. If the first temperature difference alarm value (threshold value) preset in the storage arithmetic unit 5, for example, 30 ° C., is not reached, an alarm is sounded as described above.

In another embodiment of the present invention, as shown in FIG. 4, the temperature difference between the brakes caused by the drag of the brake is determined between the left front wheel (FLT) and the left rear wheel (RLT) and the right front wheel (FR). T) and the right rear wheel (RRT), or between two tires obliquely facing each other, and this difference is compared to a second temperature difference alarm value ΔT _{J 1} (° C.), for example, 50 ° C.
When it exceeds, it is determined that there is a single axis drag and an alarm is issued.

As shown in FIG. 5, a comparison is made between two coaxial tires, and this difference is determined by the third temperature difference alarm value ΔT _{J 2} (° C.)
For example, when the temperature exceeds 40 ° C., an alarm is sounded as if there is a single-wheel drag.

FIG. 6 shows a flowchart for measuring the temperature difference between the brakes of the respective tires and judging the presence or absence of a single-axis or single-wheel drag from the temperature difference.

That is, in this embodiment, when there is a difference of T _{J 1} (for example, 50 ° C.) or more between the temperature differences measured for each brake,

ΔT _{J 1} <| ΔFL T−ΔRL T |,
ΔT _{J 1} <| ΔFL T−ΔRRT |, ΔT _{J 1} <| Δ
FR T−ΔRL T | and ΔT _{J 1} <| ΔFR T
−ΔRR T |

In this case, it is determined that there is a single-axis drag, and an alarm is sounded.

Furthermore, regarding the brakes of the left and right tires on the same axis, when there is a difference of T _{J 2} (for example, 40 ° C.) or more,

ΔT _{J 2} <| ΔFL T−ΔFR T |,
ΔT _{J 2} <| ΔRL T−ΔRRT |

In this case, it is determined that there is a single wheel drag, and an alarm is sounded.

[0029]

According to the brake overheating alarm device of the present invention, the driver can be notified of the overheating of the brake due to excessive use of the brake, so that the braking force of the brake can be prevented from lowering. Wear can be prevented.

Further, the driver can be notified of the brake abnormality before the brake is overheated due to the brake dragging failure.

Further, since there is no need to incorporate a temperature sensor into the brake lining, there is no consumable replacement part, and since no temperature sensor is incorporated into the brake drum, there is no need for a temperature transmitting means from the rotating body, and the reliability is high. There is a benefit.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a brake overheat alarm device of the present invention.

FIG. 2 is a diagram showing a relationship between a brake temperature, a vehicle speed, and an alarm temperature in the brake overheat alarm device of the present invention.

FIG. 3 is a flowchart of an overheat mode of the brake overheat alarm device of the present invention.

FIG. 4 is an explanatory diagram of a single-axis drag mode of the brake overheat alarm device of the present invention.

FIG. 5 is an explanatory diagram of a single-wheel drag mode of the brake overheat alarm device of the present invention.

FIG. 6 is a flowchart of a single-axle and single-wheel drag mode of the brake overheat alarm device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 vehicle 2a left front wheel (FLT) 2b right front wheel (FRT) 2c left rear wheel (RLT) 2d right rear wheel (RRT) 3 vehicle speed sensor 4a temperature sensor 4b temperature sensor 4c temperature sensor 4d temperature sensor 5 storage operation Device 6 Alarm buzzer 7 Alarm lamp 8 Buzzer 0FF switch 9 Brake pedal switch

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Takaaki Kishi 1-6-6 Tsukimino, Yamato-shi, Kanagawa Prefecture Tokyo Parts Industry Co., Ltd.

Claims (6)

[Claims] 1. A temperature sensor for measuring a temperature of a brake of a tire, and a difference between a temperature of the brake measured by the temperature sensor and a temperature of the brake measured after a lapse of a predetermined time from the temperature sensor is compared with a preset value. And a means for generating an alarm based on the result of the comparison. 2. The brake overheat alarm according to claim 1, wherein the temperature is measured during a brake operation. 3. The brake overheating alarm device according to claim 1, wherein the temperature is measured while the brake is off. 4. When the brake is off, a temperature sensor for measuring the brake temperature of each of a plurality of tires, a brake temperature measured by the temperature sensor obtained for each tire brake, and a temperature measured after a lapse of a predetermined time from the temperature. Means for determining a difference from the temperature of the brake, means for comparing the temperature difference between the brakes of the respective tires with each other, and comparing the difference with a preset value, and means for generating an alarm based on the result of the comparison. An overheating alarm device for a brake, comprising: 5. The brake overheating alarm device according to claim 1, wherein the preset value is determined for each vehicle speed. 6. A brake overheating alarm device according to claim 1, wherein said temperature sensor is mounted inside a dust cover of the brake and measures an ambient temperature of the brake.