KR100946852B1 - Safety parking method of parking integrated calliper brake vehicles - Google Patents

Abstract

PURPOSE: A safety parking method of a parking caliper integrated caliper brake vehicle is provided to prevent an accident in advance by checking a vehicle condition information message by a driver after calculating the thermal expansion danger level of a brake disk. CONSTITUTION: It is determined that a parking brake is on(S600). A mode accumulative value is computed after a process for calculating thermal expansion of disk(S700). It is determined that the mode accumulative value is over than a thermal expansion danger level of a brake disk(S800). A warning message is delivered to a driver(S900).

Description

Safety Parking Method Of Parking Integrated Calliper Brake Vehicles

The present invention relates to a safety parking method for a parking brake integrated caliper brake vehicle.

Recently, the application of a parking brake integrated calliper (PIC) parking brake type, which is advantageous in cost and weight, has been expanded instead of a drum in hat (DIH) parking brake structure in which the parking brake device is connected to the drum brake.

The parking brake integrated caliper is the same as the operation principle of a hydraulic Floatmg Type Callper when braking by a brake pedal, but a mechanical structure is built in the caliper to exhibit parking brake performance. It is a caliper that can also act as a parking brake.

1 is a cross-sectional view showing a disk of a conventional parking brake integrated caliper brake, of which FIG. 1 (a) is a cross-sectional view showing a case where the parking brake is operated in a thermally expanded state, and FIG. 1 (b) is of FIG. It is sectional drawing which shows the case where gap | interval (GAP) A generate | occur | produces between friction materials after a disk cools in state (a).

On the other hand, the parking brake integrated caliper has the following problems because the main driving device and the parking brake device are used together.

That is, in the conventional parking brake integrated caliper 10, the parking brake is operated in the direction of the arrow 12 in a state in which the brake disk 20 is thermally expanded as shown in FIG. There is a case.

As time passes after the parking brake is activated, as shown in FIG. 1B, the disc 20 is cooled and a gap A between the disc 20 and the friction material 30 is generated. Parking brake performance is reduced.

At this time, the parking brake is operated when the shifting auto lever is not in the P stage, the vehicle parking place has a slight slope that the driver cannot recognize well, and an accident occurs when the driver leaves the vehicle. There is a problem.

Recently, a vehicle having a relatively high coefficient of friction lowers the degree of occurrence of such a problem. However, a vehicle having a high coefficient of friction has a problem that adversely affects brake noise.

An object of the present invention is to provide a safety parking method for a parking brake integrated caliper brake vehicle that prevents an accident occurring in the vehicle after the parking brake is operated in advance.

The present invention comprises the steps of determining whether the parking brake operation;

Calculating a mode accumulation value through a disk thermal expansion calculation process;

Determining whether the cumulative value is greater than or equal to the brake disc thermal expansion risk value;

Delivering a warning message;

It provides a safe parking method for a parking brake integrated caliper brake vehicle, characterized in that it comprises a.

In addition, the present invention may include determining whether the deceleration state is on, and determining whether the brake light is turned on, and may include a wheel signal calculation step.

In the step of calculating a mode accumulation value through the disk thermal expansion calculation process, the mode accumulation value may be calculated within a predetermined time range before the parking brake operation.

On the other hand, the present invention may include a wheel speed signal input step of using the wheel speed sensor 200 information of the ABS (100).

According to the present invention, the degree of repeated braking of the vehicle and the degree of thermal expansion of the disk are calculated in advance in the electronic control unit, and the vehicle status information message is notified to the driver leaving the vehicle after the parking brake is operated, so that the accident can be prevented in advance. It has an effect.

In the present invention, if the disk thermal expansion estimation program logic is added to the logic of the ABS system and the electronic control unit (ECU), new components need not be added, thereby minimizing cost.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First of all, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used as much as possible even if displayed on different drawings. In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

 Figure 2 is a schematic diagram showing the ABS device equipped with a wheel speed sensor used in the present invention, Figure 3 is a graph showing the wheel speed change detected in the wheel speed sensor of Figure 2, Figure 4 is a parking brake integrated of the present invention It is a flowchart which shows the safety parking method of a caliper brake vehicle.

The present invention can be applied only to a vehicle equipped with an ABS (Anti-lock Brake System) system as shown in FIG. 2, the wheel speed sensor 200 for detecting a wheel speed in the vehicle equipped with the ABS 100. ) Is provided.

And, as is generally known, the wheel speed sensor 200 is a distance of the sensing position is changed according to the position of the convex portion 310 and the concave portion 320 of the tone wheel 300 coupled to the wheel, the strength of the magnetic force is By changing, the ON / OFF signal is input periodically.

The electronic control unit (ECU) 400 provided in the ABS 100 uses the information detected by the wheel speed sensor 200 to repeat the braking state of the vehicle, the degree of deceleration of the vehicle, and The degree of disk thermal expansion accordingly is calculated.

Meanwhile, FIG. 3 shows various input states of the wheel signals through the tone wheel 300 and the wheel speed sensor 200, of which (a) of FIG. 3 shows a graph change time between on and off. It is constant with this Δt and shows the wheel signal input state at the constant speed. In FIG. 3 (b), the speed of graph change between on and off is narrower than in FIG. 3 (a). It shows a faster driving condition. That is, in FIG. 3, the smaller the value of Δt is, the faster the faster the driving is.

(C) of FIG. 3 shows that Δt becomes smaller as time goes by, and the wheel speed is getting faster and accelerated. On the contrary, FIG. 3 (d) shows Δt1 as Δt passes over time. Increasing to Δt2 at, the wheel speed is reduced and the vehicle is decelerated.

The acceleration and deceleration states of the vehicle are recognized through the change of the tone wheel signal, and in particular, the vehicle deceleration is classified into a case of deceleration through braking and a case of deceleration through engine brake. It is distinguished from the deceleration through the engine brake through the lighting signal of the tail brake lamp which is an operation signal.

Meanwhile, the braking state is recognized through various input states of the wheel signals through the tone wheel 300 and the wheel speed sensor 200, and the number of braking times and decelerations obtained in the braking state are used to determine the degree of thermal expansion of the brake disc. It is a signal to inform.

In addition, since the strength and weakness of the braking state are different, the brake disc thermal expansion cannot be accurately measured only by the number of braking.

Therefore, the biggest core of the present invention is to select the deceleration mode that is the degree of deceleration degree, this deceleration mode is determined through testing and tuning in the vehicle development stage.

If the state of the deceleration is recognized from the wheel signal as shown in FIG. 3 (d) and input simultaneously to the lighting signal of the rear brake light, which is the brake pedal operation signal, the wheel signal state is classified into 1 to N according to the development concept and then electronically controlled. The operation is performed in the electronic control unit (ECU) 400. In other words, the method of classifying the braking deceleration states from the first stage to the N stage is as follows.

As shown in (d) of FIG. 3, the P value is largely divided into N stages after extracting P = Δt 2 -Δt 1, which is a change amount of the wheel signal between time determined through the test and tuning of ΔT from the input time of the brake pedal signal as the brake signal. It is done.

Set the P value of the smallest group to mode 1, and set the group of P values larger than mode 1 to mode 2, and classify modes 3, 4, 5 ----- N in the same way.

This shows a low braking state as the P value is smaller, and a rapid deceleration as the value is larger. As a result, even in the same braking state, it is necessary to consider that the force applied to the brake pad is smaller in the case of Mode 1 than in the case of Mode N. Therefore, the weights affecting the brake pads should be given differently through each mode.

For example, in case of mode 1, the braking state is the most decelerated, so a weight of 10% is given, the mode 2 is 20%, and the mode 3 is 30%. .

Finally, the values determined up to the weight in each mode are summed up, and a warning message is sent to the driver when the value reaches the SPEC, which has already been determined by the test.

 In conclusion, a warning message is sent when the signal accumulation value of each wheel is as follows.

(Number of Mode 1) X10% + (Number of Mode 2) X20% + ----------- + (Number of Mode N) X M%> = SPEC

At this time, in order to check the state of the disc immediately before parking braking, the signal accumulation value of each wheel is configured such that the calculation is performed within a predetermined time, for example, 5 minutes or 3 minutes before the final parking brake operation. Referred to as "pre-logic")

4 is a logic perspective view illustrating the present invention.

In the present invention, the safety parking method of the parking brake integrated caliper brake vehicle includes a second step (S200) of inputting a wheel speed signal through a first step (S100), and a vehicle acceleration of 0 through the second step (S200). A third step (S300) of determining whether the deceleration state is smaller than the fourth step (S300) and a fourth step of determining whether the rear brake light is turned on when it is determined that the vehicle is decelerated in the third step (S300). (S400) and the parking brake operation after the fifth step (S500) and the fifth step (S500), which is a wheel signal calculation process that proceeds when it is determined that the rear brake light is turned on in the fourth step (S400). A sixth step (S600) of determining whether the parking brake is activated in the sixth step (S600), a seventh step (S700) of calculating a mode accumulation value through a disk thermal expansion calculation process, and 7th The eighth step S800 of determining whether the cumulative value is greater than or equal to the SPEC of the brake disk thermal expansion risk value through the system S700, and the cumulative value of the cumulative value is greater than or equal to the SPEC of the brake disk thermal expansion risk value in the eighth step S800. In this case, the ninth step S1000 is performed after the ninth step S900 in which the warning message is transmitted.

When the vehicle is in an acceleration state in the third step S300, when the rear brake lamp is turned off in the fourth step S400 or when the cumulative value is less than SPEC in the fifth step S500, the tenth step S1000. Proceeds to the end.

The wheel speed signal input process of the second step (S200) continues the various input states of the wheel signal through the tone wheel 300 and the wheel speed sensor 200 from the driving state of the vehicle in the electronic control unit (ECU) 400. It is the process of calculating the input data by monitoring.

When it is determined that the vehicle deceleration is determined in the third step S300 through the electronic control unit 400 and the rear brake light is turned on in the fourth step S400, the vehicle deceleration by the brake is recognized. In operation 5500, the value calculated as the mode correction value configured in the preliminary logic according to the degree of deceleration of the vehicle starts to accumulate.

In addition, when the parking brake operation signal is detected after stopping the vehicle in the sixth step S600, a period ΔT that is a predetermined time from the detected moment, such as the preliminary logic including a disk thermal expansion calculation process in a seventh step S700. The cumulative calculation value is calculated by the electronic control unit (ECU) 400.

If it is determined in step 8 that the accumulated value that is the accumulated value is greater than or equal to the SPEC which is a risk value due to disk thermal expansion, the electronic control device 400 sends a warning message to the cluster provided in front of the driver's seat in step 9. Send.

The contents of the above warning message can be determined according to each vehicle development concept. Once the vehicle is put into the P stage and the parking brake is operated, the accident prevention effect from the series of problems is large, so "Park the shift lever into the P stage!" Message or "Flat parking to prevent vehicle flow !!" Or "Apply the chorus wheel!" You can give several warning messages.

According to the present invention, the degree of repeated braking of the vehicle and the degree of thermal expansion of the disk are calculated in advance in the electronic control unit, and the vehicle status information message is notified to the driver leaving the vehicle after the parking brake is operated, so that the accident can be prevented in advance. It has an effect.

In the present invention, if the disk thermal expansion estimation program logic is added to the logic of the ABS system and the electronic control unit (ECU), new components need not be added, thereby minimizing cost.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

1 is a cross-sectional view showing a disk of a conventional parking brake integrated caliper brake.

Figure 2 is a schematic diagram showing an ABS device equipped with a wheel speed sensor used in the present invention.

3 is a graph showing wheel speed changes detected by the wheel speed sensor of FIG. 2.

Figure 4 is a flow chart showing a safe parking method of the present invention parking brake integrated caliper brake vehicle.

<Description of the symbols for the main parts of the drawings>

100: ABS 200: wheel speed sensor

300: tone wheel 310: convex portion

320: recessed portion

Claims (5)

Determining whether the parking brake is operated; Calculating a mode accumulation value through a disk thermal expansion calculation process; Determining whether the cumulative value is greater than or equal to the brake disc thermal expansion risk value; Delivering a warning message; Parking brake integrated caliper brake vehicle safety parking method characterized in that it comprises a. The method according to claim 1, And a step of determining whether the deceleration is on and whether the brake light is turned on. The method according to claim 2, Parking signal integrated parking caliper brake vehicle safety parking method comprising the step of calculating the wheel signal. The method according to any one of claims 1 to 3, And calculating the mode accumulation value through the disk thermal expansion calculation process, wherein the calculation of the mode accumulation value is performed within a predetermined time range before the parking brake operation. The method according to claim 4, A parking speed integrated caliper brake vehicle safety parking method comprising a step of inputting a wheel speed signal using the wheel speed sensor (200) information of the ABS (100).

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