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

A technology of abnormal judgment and braking device, which is applied in the direction of brake control system, automatic starting device, brake, etc., and can solve the problem of not being able to reduce the driving sound of the motor

Active Publication Date: 2018-12-21
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 determining method
  • Brake device, brake control method, and motor lock abnormality determining method
  • Brake device, brake control method, and motor lock abnormality determining 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

Provided are a brake device, a brake control method, and a motor lock abnormality determination method, whereby it is possible to reduce motor drive noise during the self-diagnosis of a motor regardless of circumstances. This brake control method comprises: a drive instruction step for driving the motor by repeated ON / OFF driving so that the motor rotational speed in OFF state does not become zeroand the peak of motor rotational speed increases gradually in subsequent ON states; a terminal voltage detection step for detecting the terminal voltage of the motor during the ON / OFF driving in thedrive instruction step; and a motor lock abnormality determination step for determining the presence / absence of a motor lock abnormality on the basis of the characteristics of the terminal voltage inthe OFF state of the ON / OFF driving as detected in the terminal voltage detection step.

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 & AuthorityApplications(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