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Brake booster

A technology of brake booster and brake pedal, which is applied in the direction of brake transmission device, foot-operated starting device, brake, etc., and can solve the problems of unfixed, divergent, pedal oscillation and other problems of brake pedal reaction force

Active Publication Date: 2009-10-07
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As described above, in terms of control, since the displacement of the booster member is controlled relative to the displacement of the input member, when the input member or the booster member is displaced due to disturbances other than the displacement of the input member accompanying the operation of the brake pedal, the control will change. Oscillation or divergence, worry about fluctuating pressure or pedal oscillation
[0006] In addition, the amount of brake fluid that circulates to the master cylinder varies depending on the amount of decompression, etc., and the circulation operation itself is performed intermittently, so the reaction force given to the brake pedal is not constant, and the driver may feel uncomfortable. question

Method used

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Examples

Experimental program
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Embodiment 1

[0029] [Structure of brake control device]

[0030] figure 1 The overall configuration of the brake control device 1 according to the first embodiment is shown. The FL wheel is the front left wheel, the FR wheel is the front right wheel, the RL wheel is the rear left wheel, and the RR wheel is the rear right wheel. In addition, the dotted line with the arrow mark is the signal line, and the direction of the signal flow is indicated by the orientation of the shoulder mark.

[0031] Brake control device 1 includes: master cylinder 2; fuel tank (reservoir tank) RES; wheel brake cylinder pressure control mechanism 3; wheel brake cylinders 4a-4d provided on each wheel FL, FR, RL, RR; The master cylinder 2 is connected to the master cylinder pressure control mechanism 5 and the input rod 6; the brake operation amount detection device 7; the master cylinder pressure control device 8 for controlling the master cylinder pressure control mechanism 5; and the wheel brake cylinder press...

Embodiment 2

[0167] Next, Example 2 will be described. The basic structure is the same as that of Embodiment 1, so only the differences will be described. Figure 12 is a block diagram showing the control structure of the second embodiment. The structure of the basic normal assist control (passive control of the assist member) and the control switching process are the same as those of the first embodiment, and therefore description thereof will be omitted. In Embodiment 1, the fluctuation of the input member is suppressed by restricting the position of the assist member within a predetermined range. On the other hand, Embodiment 2 is different in that the master cylinder pressure is controlled.

[0168] Next, the configuration of the assist member active control that limits the operating range of the assist member during ABS control will be described. In addition, the master cylinder pressure sensors 3 a and 3 b are collectively referred to as master cylinder pressure sensors.

[0169]...

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Abstract

The present invention provides a brake booster in which an excellent pedal feeling can be provided even though a brake fluid pressure control unit is disposed between the brake booster and a wheel cylinder. The brake booster according to the present invention performs different methods for controlling a booster based on whether the fluid pressure control unit is in operation, and controls a displacement amount of an assist member so that a change in a master cylinder pressure is within a predetermined range even when the fluid pressure control unit is in operation.

Description

technical field [0001] The present invention relates to a brake booster capable of imparting a boost force to a brake pedal operation. Background technique [0002] Patent Document 1 discloses a technique in which an input member and an assist member for changing the volume in a master cylinder are provided, and the assist member is displaced according to the operation of the brake pedal, and the assist member is displaced. component displacement. In this way, in addition to the volume change in the master cylinder caused by the operation of the brake pedal, the volume change by the booster member is also provided to realize a so-called booster mechanism that imparts boost force when the brake pedal is operated. [0003] [Patent Document 1] (Japanese) Unexamined Patent Publication No. 2007-112426 [0004] Here, when a brake fluid pressure control unit capable of executing antilock brake control or the like is arranged between a brake booster and a wheel cylinder, there are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T13/74B60T7/06B60T13/12
CPCB60T8/4872B60T13/745B60T13/147B60T8/4275
Inventor 樋熊元宏山野和也斋藤隆允仓垣智
Owner HITACHI LTD
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