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Bbw brake device

A technology of braking device and electric braking, applied in the direction of braking action starting device, brake, transportation and packaging, etc., can solve the problems of brake hydraulic pulsation and difficult braking, etc.

Active Publication Date: 2014-11-12
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the above-mentioned BBW type brake device, when the driver does not step on the brake pedal when the non-braking is arranged between the slave hydraulic cylinder and the wheel cylinder, the energy supplied to the wheel cylinder of each wheel is In the case of a brake hydraulic pressure control mechanism such as a VSA (Vehicle Stability Assist) device that controls the brake hydraulic pressure separately to control the yaw moment of the vehicle, the brake hydraulic pressure generated by the hydraulic pump installed in the VSA device has pulsations, so There is a problem that smooth braking by the wheel cylinder is difficult

Method used

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Experimental program
Comparison scheme
Effect test

no. 1 approach

[0038] first embodiment

[0039] Such as figure 1 As shown, the tandem-type master hydraulic cylinder 11 has rear and front hydraulic chambers 13A and 13B that output brake hydraulic pressure corresponding to the driver's depressing force on the brake pedal 12, and the rear hydraulic chamber 13A passes through the hydraulic passage Pa. . Roads Qa, Qb, Qc, Qd, Qe (second system) are connected to wheel cylinders 20, 21 of disc brake devices 18, 19 for the right front wheel and left rear wheel, for example.

[0040] A shut-off valve 22A as a normally open electromagnetic valve is arranged between the liquid paths Pa and Pb, and a stop valve 22B as a normally open electromagnetic valve is arranged between the liquid paths Qa and Qb. A slave hydraulic cylinder 23 is disposed between Pc and Qc. A VSA (Vehicle Stability Assist) device 24 is disposed between the fluid paths Pc, Qc and the fluid paths Pd, Pe; Qd, Qe.

[0041] A stroke simulator 26 is connected to the liquid paths R...

no. 2 approach

[0067] exist image 3 In the first embodiment described in , when the nonlinearity of the load fluid loss characteristic is strong, the difference between the operation amount of the slave hydraulic cylinder 23 required for VSA control and the operation amount of the slave hydraulic cylinder 23 calculated from the equivalent target hydraulic pressure is There is a problem that the accuracy of the brake hydraulic pressure generated by the slave hydraulic cylinder 23 is degraded.

[0068] Therefore, in the second embodiment, the target hydraulic pressure of each wheel input from the control device of the VSA device 24 is respectively applied to the hydraulic pressure-slave hydraulic cylinder stroke mapping and converted into the target stroke of the slave hydraulic cylinder 23, and these four The target strokes of the slave cylinders 23 are added to calculate the final target stroke of the slave cylinders 23 .

[0069] According to the second embodiment, the influence of the no...

no. 3 approach

[0072] The third embodiment is a modification of the second embodiment. When using the slave hydraulic cylinder 23 to brake a plurality of wheels, in the second embodiment due to the slave hydraulic cylinder 23 or the wheel brake cylinders 16, 17; 20 , 21 fluid loss and the brake hydraulic pressure produced by the slave hydraulic cylinder 23 is insufficient.

[0073]Therefore, the maximum target hydraulic pressure among the target hydraulic pressures of the four wheels is selected by high select, and the maximum target hydraulic pressure is applied to the hydraulic pressure-slave hydraulic cylinder stroke mapping to convert it into the target stroke of the slave hydraulic cylinder 23 . Then, add the target stroke of the slave hydraulic cylinder 23 corresponding to the maximum target hydraulic pressure to the summed value of the four target strokes of the slave hydraulic cylinder 23 corresponding to the four wheels, and use the obtained value as the final slave hydraulic cylind...

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Abstract

A brake fluid pressure electrically generated by a slave cylinder (23) in accordance with an operation amount by a brake pedal (12) is supplied via a VSA system (24) to wheel cylinders (16, 17; 20, 21) provided respectively for wheels. This enables smooth braking by the wheel cylinders (16, 17; 20, 21) by using a brake fluid pressure pressurized by the slave cylinder (23) and including little pulsation. When the VSA system (24) is to individually control the brake fluid pressures supplied respectively to the wheel cylinders (16, 17; 20, 21) to control vehicle behavior, the slave cylinder (23) generates a brake fluid pressure corresponding to a total of the brake fluid pressures required for the wheel cylinders (16, 17; 20, 21). This configuration allows the slave cylinder (23) to generate a brake fluid pressure in just proportion.

Description

technical field [0001] The present invention relates to a BBW brake device, which comprises: a wheel brake cylinder provided for each wheel and generating braking force through brake hydraulic pressure; a brake operation amount detection mechanism for detecting the amount of brake operation performed by the driver; an electric brake hydraulic pressure generating mechanism that supplies brake hydraulic pressure electrically generated according to the brake operation amount to the wheel cylinder; and is disposed between the electric brake hydraulic pressure generating mechanism and the wheel cylinder Brake fluid pressure control means that individually controls the brake fluid pressure supplied to the wheel cylinders from time to time. Background technique [0002] The aforementioned BBW (brake-by-wire) brake device is known from Patent Document 1 below. [0003] This BBW type brake device performs a map search for the brake hydraulic pressure that should be generated by the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60T8/17
CPCB60T8/1755B60T2270/82B60T7/042B60T8/4081B60T13/745
Inventor 大久保直人西冈崇
Owner HONDA MOTOR CO LTD