Anti-lock brake system for vehicles
AssigneeNEC Tokin Corporation
InventorsKiyoshi Kawaguchi, Nobuo Seko, Tatsuo Itoh, Takashi Nagai, Yoshiaki Okita, Hiroyasu Yamamoto
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Abstract
A high reliability and low power consumption anti-lock brake system is disclosed in the present invention. The two pilot valves in the present invention are controlled so as not to be energized concurrently. The secondary battery of the anti-lock brake system is charged by power supply and/or generator. An electric double layer capacitor comprising a housing made of functionally graded aluminum-ceramic material is used as the secondary battery.
Claims17
An anti-lock brake system for a trailer hauled by a motor-powered car, which comprises brake command output unit, comprising:
- (A) a breaking force generating unit for generating breaking force to a plurality of wheels of said trailer;
- (B) an anti-skid valve for relaxing the breaking force generated by said breaking force generating unit;
- (C) a plurality of skid detection units, each one of said plurality of skid detection units detecting skid of the wheels to which said respective one of said plurality of skid detection unit is installed;
- (D) an anti-skid brake system controller for outputting to said anti-skid valve on the basis of a signal from said skid detection unit a command instructing relaxation of the breaking force;
- (E) a secondary battery for providing electric power to said breaking force generating unit, said plurality of skid detection unit, and said anti-skid brake system controller;
- and
- (F) a generator for charging said secondary battery;
- wherein said generator is installed on at least one of said plurality of wheels and generates power in response to the rotation of said one of said plurality of wheels;
- and
- said secondary battery is charged with power generated by said generator.
An anti-lock brake control method for vehicles comprising (A) an anti-skid valve comprising (1) a two-way valve comprising a first pilot valve whose operation mode is normally-open or normally-closed and a first main valve whose operation mode is different from said first pilot valve and (2) a three-way valve connected serially to said two-way valve comprising a second pilot valve whose operation mode is normally-open or normally-closed and a second main valve whose operation mode is different from said first pilot valve, (B) a plurality of wheels, and (C) an actuator for applying breaking force to said plurality of wheels, comprising the steps of:
- breaking force generating step for generating breaking force;
- calculation step for calculating a parameter showing whether wheel is skidding;
- determination step for determining whether said parameter exceeds a predetermined value;
- relaxation step for outputting during a first predetermined duration a signal for causing said first pilot valve to be de-energized and said second pilot valve to be energized when said parameter is determined to exceed said predetermined value;
- maintaining step for outputting during a second predetermined duration a signal for causing said first pilot valve to be energized and said second pilot valve to be de-energized after said relaxation step is finished;
- re-applying step for outputting a signal for causing both said first pilot valve and said second pilot valve to be de-energized after said relaxation step is finished when said parameter is determined not to exceed said predetermined value in said determination step.
Dependencies are inferred from the claim text.