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Braking device for vehicles

A braking device and vehicle technology, applied in the control device, brake, control drive and other directions, can solve problems such as passenger discomfort, and achieve the effect of preventing the generation of buzzing sounds

Inactive Publication Date: 2015-08-19
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When switching from regenerative braking to hydraulic braking, especially when the hydraulic braking force suddenly rises when the vehicle speed is low, the slipping of the brake pads and the brake discs will cause "gooing". noise (so-called honk), which may cause discomfort to passengers

Method used

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  • Braking device for vehicles
  • Braking device for vehicles

Examples

Experimental program
Comparison scheme
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no. 1 approach

[0032] Such as figure 1 As shown, the tandem-type master hydraulic cylinder 11 is provided with a sub-hydraulic chamber 13A and a main hydraulic chamber 13B that output brake hydraulic pressure corresponding to the driver's depressing force on the brake pedal 12, and the sub-hydraulic chamber 13A passes through the hydraulic passages Pa, Pb . Qe is connected to the wheel cylinders 20, 21 of the disc brake devices 18, 19 of the right front wheel and the left rear wheel, for example.

[0033] An on-off valve 22A as a normally open electromagnetic valve is arranged between the liquid paths Pa and Pb, and an on-off valve 22B as a normally open electromagnetic valve is arranged between the liquid paths Qa and Qb. A slave hydraulic cylinder 23 is arranged between the hydraulic passages Pc and Qc. Further, a stroke simulator 26 is connected to the hydraulic passages Ra and Rb branched from the hydraulic passage Qa extending from the main hydraulic chamber 13B via a reaction force a...

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Abstract

In a vehicle capable of performing regenerative braking and fluid pressure braking, in changing from the regenerative braking to the fluid pressure braking in response to a decrease of a vehicle speed due to braking, a fluid pressure braking force is increased from 0 at a first increasing rate when the vehicle speed falls to or below a first threshold value (V1), and the fluid pressure braking force is increased at a second increasing rate, which is higher than the first increasing rate, when the vehicle speed falls to or below a second threshold value (V2), which is smaller than the first threshold value (V1). With this configuration, while occurrence of a squeal noise of a wheel cylinder can be prevented by setting the first increasing rate of the fluid pressure braking force at a small value, a required braking force can be generated without any problem by setting the second increasing rate, to be used subsequently thereto, of the fluid pressure braking force at a large value.

Description

technical field [0001] The present invention relates to a braking device for a vehicle including a regenerative braking device and a hydraulic braking device capable of performing both regenerative braking and hydraulic braking, that is, a vehicle that switches from regenerative braking to hydraulic braking after the start of braking. Braking device. Background technique [0002] According to the following Patent Document 1, there is known a BBW (brake-by-wire) brake device in which the operation of the brake pedal by the driver is converted into an electric signal, and a slave that operates based on the electric signal The brake hydraulic pressure generated by the dynamic hydraulic cylinder is used to activate the wheel brake cylinder, and as a backup when the slave hydraulic cylinder fails, a master hydraulic cylinder that operates through the brake pedal is installed. When the slave hydraulic cylinder is normal, the stroke simulation is used. The device absorbs the brake...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T8/17B60L7/24B60T8/00
CPCB60T2270/604B60W2520/10B60T8/4081B60W10/08B60T8/00B60L7/26B60L7/18B60W30/18127Y02T10/7275B60L7/24B60W10/184B60L15/2009B60L2240/12B60T1/10Y02T10/64Y02T10/72
Inventor 松下悟史
Owner HONDA MOTOR CO LTD
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