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Braking force control apparatus of wheeled vehicle

A technology for controlling equipment and braking force, applied in the direction of brakes, etc., which can solve problems such as brake failure and increased operating noise of the brake system

Inactive Publication Date: 2006-09-20
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to other problems such as increased operating noise from the brake system and undesirable brake failure due to overheated brake pads and rotors

Method used

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  • Braking force control apparatus of wheeled vehicle
  • Braking force control apparatus of wheeled vehicle
  • Braking force control apparatus of wheeled vehicle

Examples

Experimental program
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Effect test

Embodiment Construction

[0022] Referring now to the drawings, and particularly to FIG. 1, there is shown a system diagram of the braking force control apparatus of this embodiment. The braking force control apparatus of this embodiment is used for, for example, a four-wheeled vehicle employing a hill descent control (HDC) system and has a so-called diagonally split type brake circuit layout (X-split type brake circuit layout). As clearly shown in Fig. 1, the braking force control device employs four main operating components, which are an electronic control unit (ECU) 1, a hydraulic brake unit (or hydraulic regulator or hydraulic regulating device) 2, An acceleration sensor 3 (a longitudinal G sensor to be precise) serving as a slope detector for detecting the slope steepness or road surface gradient in the longitudinal direction of the vehicle, and the front left, front right, rear left, and rear right road wheels FL, FR, RL, Wheel speed sensor 4, 4, 4, 4 at RR. The ECU 1 generally includes a micro...

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PUM

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Abstract

In a braking force control apparatus of a wheeled vehicle employing a vehicle sensor capable of detecting at least a slope in a longitudinal direction of the vehicle, and a hydraulic modulator regulating a wheel-brake cylinder pressure of each of front and rear road wheels, a control unit is configured to be electronically connected to the vehicle sensor and the hydraulic modulator, for independently controlling the wheel-brake cylinder pressure of the front road wheel and the wheel-brake cylinder pressure of the rear road wheel by respective control rules, different from each other. When a first one of the two different control rules is applied to the front road wheel, the control unit applies the second control rule to the rear road wheel. Conversely when the second control rule is applied to the front road wheel, the control unit applies the first control rule to the rear road wheel.

Description

technical field [0001] The present invention relates to a braking force control device of a wheeled vehicle, and in particular to an improvement of the braking force control technology of a wheeled vehicle. This technology adopts a slope driving control system, and in particular can realize controlled braking without the need for the driver to apply the brakes. Downhill downhill control (hill-descent control, abbreviated as HDC) system, so as to achieve stable vehicle running downhill. Background technique [0002] In recent years, various hill descent control (HDC) techniques have been proposed and developed. In the braking force control device of a wheeled vehicle with an HDC system, in order to bring the actual wheel speed closer to the desired wheel speed based on the accelerator opening, the brake fluid pressure command value of each wheel brake cylinder is generally increased by proportional Integral-plus-derivative (PID) control, where the control signal is a linear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60T8/32
CPCB60T8/4872B60T8/245B60T8/268B60T2201/04
Inventor 大津伸幸
Owner HITACHI LTD