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Brake control device

A technology of brake control and control equipment, applied in the direction of brakes, etc., can solve problems such as unstable vehicle behavior

Inactive Publication Date: 2008-02-20
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This can cause issues with erratic vehicle behavior during braking

Method used

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  • Brake control device
  • Brake control device
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] [System Configuration]

[0045] Embodiment 1 will be described below with reference to FIGS. 1 to 13 . FIG. 1 is a system configuration diagram of a brake control apparatus according to Embodiment 1. FIG. The brake control apparatus according to Embodiment 1 is a four-wheel hydraulic brake-by-wire system including first and second hydraulic pressure units HU1 and HU2 for controlling hydraulic pressure independently of the driver's operation of brake pedal BP.

[0046] The control unit 1 (control mechanism, or control means) includes: a main ECU 300 (main unit) for calculating desired wheel cylinder pressures P*fl to P*rr of the wheels FL to RR; and sub-ECUs 100 and 200 ( first and second subunits) for driving the first and second hydraulic units HU1 and HU2.

[0047] The first and second hydraulic pressure units HU1 and HU2 are driven by the first and second sub-ECUs 100 and 200 according to commands from the main ECU 300 . Stroke simulator S / Sim connected to master ...

Embodiment 2

[0248] Embodiment 2 will be described below with reference to FIGS. 14 to 16 . Since the basic configuration is similar to that of Embodiment 1, only the different points will be described below. In Embodiment 1, during supercharging, the difference in fluid pressure between the left and right wheels is corrected by reducing the output of the motor connected to the higher pressure wheel cylinders of the left and right wheels. In contrast, in Embodiment 2, the difference in fluid pressure is corrected by increasing the output of the motor connected to the lower pressure wheel cylinder.

[0249] [Relationship of commands between ECUs]

[0250] (Control to increase the motor output of the lower pressure unit during boosting)

[0251] 14 is a block diagram showing the relationship of commands between the main ECU 300, the first and second sub-ECUs 100 and 200 under braking force correction control (control to increase the motor output of the lower pressure unit).

[0252] The m...

Embodiment 3

[0285] [Control to reduce the flow rate of the higher pressure intake valve during boosting]

[0286] Embodiment 3 will be described below with reference to FIGS. 17 to 19 . The basic configuration of this embodiment is similar to that in Embodiment 1. In Embodiment 1, braking force correction is performed by reducing the output of the motor connected to the higher pressure wheel cylinders in the left and right wheels. In contrast, in Embodiment 3, the braking force correction is performed by reducing the opening degree of the intake valve IN / V connected to the higher pressure wheel cylinder so as to reduce the flow of the intake valve IN / V(FL). Rate.

[0287] For example, when the FL wheel actual wheel cylinder pressure Pfl is higher than the FR wheel actual wheel cylinder pressure Pfr based on a single desired wheel cylinder pressure P*α, the FL wheel intake valve IN / V(FL) (which is normally solenoid valve) to be smaller than that of the FR wheel intake valve IN / V (FR), t...

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Abstract

A brake control device including: a braking-effort-sensing device for sensing braking efforts of vehicle wheels; an actuator for applying braking efforts to the vehicle wheels; and a control device for controlling the braking efforts of the vehicle wheels by controlling the actuator, wherein the control device: computes desired braking efforts of the vehicle wheels; and when the desired braking efforts of left and right wheels of the vehicle wheels are equal to each other, performs a braking effort correction of allowing the braking effort of one of the left and right wheels to approach the braking effort of the other of the left and right wheels. With this, it is possible to stabilize vehicle behavior during braking while minimizing effects caused on the control due to variations in production.

Description

technical field [0001] The present invention relates to a brake control device for applying a braking force to a wheel. Background technique [0002] For example, Patent Document 1 discloses conventional technology related to a brake control apparatus. The brake control apparatus described in this publication includes a hydraulic braking force control device and a fluid pressure sensor for each wheel, and realizes precise vehicle control by controlling the wheel cylinder pressure on each wheel independently of each other. Patent Document 1: Japanese Patent Application Publication No. 2002-211374. Contents of the invention [0003] The problem to be solved by the present invention [0004] According to the conventional technique described above, manufacturing variations of solenoid valves etc. result in variations in flow rate characteristics among the wheels resulting in actual braking forces at the wheels based on equal desired braking forces between the left and right ...

Claims

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Application Information

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IPC IPC(8): B60T8/00B60T8/17
Inventor 岩崎克也梶山径吾
Owner HITACHI LTD
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