Road surface friction sensor and road surface friction coefficient detector, and vehicle antilock braking device
a technology of friction coefficient detector and friction sensor, which is applied in the direction of process and machine control, radio frequency controlled devices, instruments, etc., can solve the problems of increasing the pressure of brake fluid, and achieve the effect of minimizing the braking distan
Inactive Publication Date: 2006-09-21
JAPAN ELECTRONICS IND LTD
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Benefits of technology
The first antilock braking device described in this patent is designed to cyclically increase and decrease brake fluid pressure based on the road surface friction force and the velocity of gain in road surface friction coefficient. This device can prevent the brakes from locking up and ensures optimal braking performance regardless of road conditions. The second antilock braking device described in this patent is designed to detect the road surface friction coefficient and adjust the brake fluid pressure accordingly to prevent the brakes from locking up and improve safety on the road.
Problems solved by technology
First, as a sudden brake is applied by depressing the brake pedal or manipulating the brake lever, the brake fluid pressure increases.
Method used
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[0035] In the following description of embodiments, an automobile will be taken as an example. However, it should be understood that the present invention is applicable to other types of vehicles as well.
[0036]FIG. 2 and 3 illustrate an antilock braking device embodying the principle of this invention.
[0037] The control means 3 controls the pressure of brake fluid with reference to measured values of brake pedal depressing force, road surface frictional force and brake fluid pressure. A brake pedal depressing force sensor 2, brake fluid pressure generator 4, brake means 5 and brake fluid pressure sensor 6 may each be implemented by utilizing the known technologies. The control means 3 comprises an electronic circuit including a microprocessor, a memory and an input-output interface and functions according to program written into the memory. An example of the action of this control means 3 is illustrated in the flow chart of FIG. 3. When the brake pedal-depressing force exceeds a s...
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Abstract
A method for cyclically controlling the braking of a vehicle includes the following steps: (a) detecting a road surface frictional force of said vehicle, (b) detecting a brake fluid pressure, and (c) controlling the brake fluid pressure in response to detected values including the brake fluid pressure and the road surface frictional force, the controlling including decreasing the brake fluid pressure in response to the road surface frictional force declining during an increase of the brake fluid pressure and increasing the brake fluid pressure in response to the road surface frictional force declining during fall-off of the brake fluid pressure.
Description
BACKGROUND OF THE INVENTION [0001] 1. Technical Field [0002] This invention relates to an antilock braking device for precluding the locking of the wheels of a vehicle on sudden application of the brake and a road surface friction sensor and a road surface friction coefficient detector which can be used as components of said antilock braking device. [0003] 2. Technical Background [0004] The conventional antilock braking device for cars or other vehicles generally employs a system such that the braking action is automatically controlled according to the chassis speed and wheel speed in such a manner that the slip ratio will fall within a definite range (See, for example, Japanese Patent Publication No. 30585 / 1984 and Japanese laid-open Patent Application KOKAI No. 61354 / 1985). The relationship between road surface friction coefficient and slip ratio is variable according to the texture of the road surface and, for this reason, the above system does not always provide the maximum brak...
Claims
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IPC IPC(8): G06F17/00B60T8/172B60T8/1763G01N19/02H01L27/148
CPCB60T8/172B60T8/1725B60T8/17636B60T8/52B60T2210/12G01N19/02H01L27/14806H01L27/14875
Inventor MIYAZAKI, NAGAO
Owner JAPAN ELECTRONICS IND LTD