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Electric Parking Brake

A technology of braking device and control device, applied in the direction of automatic starting device, braking transmission device, brake, etc., can solve problems such as reduction of pressing force

Active Publication Date: 2020-03-06
ADVICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the parking process is performed under a condition where the temperature of the brake pad is high, the brake pad shrinks greatly as the temperature of the subsequent brake pad decreases, so the above-mentioned pressing force tends to decrease.

Method used

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  • Electric Parking Brake
  • Electric Parking Brake
  • Electric Parking Brake

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0023] Below, according to Figure 1 to Figure 6 A first embodiment in which an electric parking brake device is embodied will be described.

[0024] Such as figure 1 As shown, the electric parking brake device 10 includes: a brake disc (Brake disc) 11, which is an example of a rotating body that rotates integrally with a wheel 100; and a pair of brake pads (Brake pad) 12, 13, which They are arranged on both sides of the brake rotor 11 in the vehicle width direction. The brake pads 12 and 13 have a back plate 14 and a friction member 15 fixed to the back plate 14 . Then, the brake pads 12 and 13 approach the brake disc 11, and when the friction material 15 is pressed against the brake disc 11, a braking force corresponding to the force pressing the friction material 15 against the brake disc 11, that is, a pressing force is applied to the brake disc 11. Wheels 100. That is, the braking force applied to the wheel 100 can be increased by increasing the pressing force.

[00...

no. 2 approach

[0063] Next, according to Figure 7 as well as Figure 8 A second embodiment in which the electric parking brake device 10 is realized will be described. The electric parking brake device 10 of the present embodiment differs from the first embodiment in that the predetermined time TTH is variable, the calculation method of the reset pressing force NbpS, and the like. Therefore, in the following description, the parts different from those of the first embodiment will be mainly described, and the same reference numerals will be assigned to the same or corresponding component structures as those of the first embodiment, and repeated description will be omitted.

[0064] In the electric parking brake device 10 of the present embodiment, the pressing force increase amount ΔNbp is fixed at a predetermined value, based on the initial pressing force NbpF which is the sum of the pressing force increasing amount ΔNbp and the lower limit pressing force NbpL, and the fictive temperature....

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Abstract

An electric parking brake device generates pressing force by pressing friction materials against a brake disc by causing a piston to move by motor operation. A control device executes: parking processing wherein the motor increases the pressing force to an initial pressing force higher than a lower-limit pressing force; and re-drive processing wherein the motor is driven and the pressing force increased at a re-drive time, which is a predetermined time after the end of execution of parking processing. During parking processing, the control device uses one among the initial pressing force and the predetermined time, in addition to a pressing force decrease characteristic corresponding to an assumed temperature set for use in calculation, as a basis to calculate the other of the initial pressing force and the predetermined time such that the pressing force becomes equal to or less than the lower-limit pressing force at the re-drive time.

Description

technical field [0001] The present invention relates to an electric parking brake device provided on a vehicle. Background technique [0002] An example of an electric parking brake device is described in Patent Document 1: a brake pad, which is an example of a friction member, is pressed against a brake disc, which is an example of a rotating body that rotates integrally with a wheel, using the drive amount of a motor. Force is adjusted by pressure. In the parking process performed by such an apparatus, the motor is driven, whereby the shaft member moves in the axial direction to push the brake pad. Then, the brake pad comes into contact with the brake disc and is pressed. Then, when the pressing force reaches the initial pressing force, the driving of the motor is stopped. [0003] In addition, there are cases where brake pads expand due to temperature rise. In addition, when the parking process is performed under the condition that the temperature of the brake pads is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T13/74B60T7/12
CPCB60T7/12B60T13/741F16D55/226F16D65/183B60T8/171B60T8/172B60T8/32B60T13/746F16D65/18F16D66/00F16D2066/001F16D2066/005F16D2066/006F16D2121/24
Inventor 半泽雅敏都筑哲明
Owner ADVICS CO LTD