Brake device, brake control method, and motor lock abnormality judging method

A technology of abnormality determination and braking device, applied in braking control system, automatic starting device, brake, etc., can solve the problem of unable to reduce motor driving sound and so on

Active Publication Date: 2021-06-04
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, in the prior art described above, it is necessary to drive the motor with a duty ratio of 100% for a certain period of time when the power supply voltage drops or in a low-temperature environment, so there is a problem that the motor driving sound cannot be reduced.

Method used

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  • Brake device, brake control method, and motor lock abnormality judging method
  • Brake device, brake control method, and motor lock abnormality judging method
  • Brake device, brake control method, and motor lock abnormality judging method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0024] figure 1 It is a system configuration diagram showing a vehicle brake drive system to which the brake device according to Embodiment 1 is applied.

[0025] The braking device of Embodiment 1 is applicable to a vehicle with an engine. The braking device applies frictional braking force generated by hydraulic pressure to the respective wheels of the vehicle (left front wheel FL, right front wheel FR, left rear wheel RL, right rear wheel RR). Each wheel FR to RR is provided with a brake operation unit BU. Braking unit BU is a braking force generator including wheel cylinder W / C. The brake action unit BU is, for example, a disc type and has a brake caliper (hydraulic brake caliper). The brake caliper includes a brake disc and brake pads. Brake discs are brake pads that rotate integrally with the tire. The brake pads are arranged with a predetermined clearance with respect to the brake disc, and come into contact with the brake disc by the hydraulic movement of the whee...

Embodiment approach 2

[0098] Next, Embodiment 2 will be described. Since the basic configuration is the same as that of Embodiment 1, only different points will be described.

[0099] [Motor lock abnormal judgment processing]

[0100] Figure 7 It is a flowchart showing the flow of motor lock abnormality determination processing in the second embodiment. Additionally, with Figure 4The same step numbers are assigned to the same processing steps, and explanations are omitted.

[0101] In step S5, the output of the motor drive signal is stopped at the drive command unit 22a, and the counter T1 is cleared at the motor lock abnormality determination unit 22c. The absolute value of the difference between the terminal voltages calculates the terminal voltage, and proceeds to step S6.

[0102] In step S21, the terminal voltage detection unit 22b calculates the terminal voltage based on the absolute value of the difference between the voltage of the high-voltage side terminal and the voltage of the lo...

Embodiment approach 3

[0108] Next, Embodiment 3 will be described. Since the basic configuration is the same as that of Embodiment 1, only the different points will be described.

[0109] Figure 8 It is a block diagram of the motor drive circuit of Embodiment 3.

[0110] In order to determine whether or not there is an electrical abnormality in the motor M, the CPU 21 a of the brake control unit BCU executes the motor electrical abnormality determination process while starting the motor lock abnormality determination process. The CPU 21a has a motor electrical abnormality determination unit 22d.

[0111] [Motor lock abnormal judgment processing]

[0112] The motor lock abnormality determination process of Embodiment 3 is the same as Figure 4 The first embodiment shown is substantially the same, but the predetermined off time in step S6 is different from the first embodiment. When the number of motor drives is one or more, the predetermined off time is set to the same time as in Embodiment 1 ...

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Abstract

The present invention provides a brake device, a brake control method, and a motor lock abnormality determination method capable of reducing motor driving noise during motor self-diagnosis regardless of the situation. The brake control method includes: a driving command step, repeatedly performing on-off driving, and driving the motor in such a way that the motor speed when it is off is not zero and the peak value of the motor speed when it is turned on is higher; the terminal voltage detection step , detecting the terminal voltage of the motor during the on-off driving performed in the drive instruction step; the motor lock abnormality determination step, based on the characteristic determination of the terminal voltage during the off-time of the on-off drive detected in the terminal voltage detection step Whether the motor is locked or not.

Description

technical field [0001] The invention relates to a brake device, a brake control method and a motor lock abnormality judging method. Background technique [0002] Patent Document 1 discloses a method of judging the presence or absence of a locking abnormality in a motor that drives a pump in a braking device. In this prior art, the motor is driven for a certain period of time with a duty ratio lower than 100%, and only when it is not determined that there is no locking abnormality at the end of the drive, the motor is driven at a duty ratio of 100%. Drive the motor 100% to determine whether there is a locking abnormality. [0003] prior art literature [0004] patent documents [0005] Patent Document 1: (Japanese) Unexamined Patent Application Publication No. 2001-268782 Contents of the invention [0006] The problem to be solved by the invention [0007] However, in the prior art described above, it is necessary to drive the motor with a duty ratio of 100% for a cert...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B60T17/22B60T8/94B60T17/00B60T17/02H02H7/093
CPCB60T17/02B60T7/12B60T8/40B60T8/4872B60T8/90B60T13/146B60T13/662B60T13/686B60T17/221B60T8/885B60T2270/406B60T2270/414H02H7/08B60T17/22B60T17/00B60T8/17B60T8/94H02H7/093B60T13/665
Inventor瀬川将纪
OwnerHITACHI ASTEMO LTD