Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1984-08-08
1987-05-19
Caldwell, Sr., John W.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303109, 364426, B60T 870
Patent
active
046662189
ABSTRACT:
In an antiskid control system for the hydraulic braking system of a wheeled vehicle, the rotational speed of a vehicle wheel and the acceleration of the wheel are detected and levels of road surface friction are determined on the basis of the wheel speed and acceleration to give a first indication that the road has a high value of friction or a second indication that the road has a low value of friction. The wheel speed and acceleration are analyzed to detect a down-pressure mode to decrease the fluid pressure of the braking system and an up-pressure mode to increase the pressure. In response to the presence of the first indication, the down-pressure mode is effected at a lower rate and then at a higher rate. In response to the occurrence of the second indication, the down-pressure mode is effected at the higher rate.
REFERENCES:
patent: 3578819 (1971-05-01), Atkins
patent: 3674320 (1970-07-01), Howard et al.
patent: 3698772 (1972-10-01), Nixon
patent: 3717384 (1973-02-01), Harned
patent: 3861756 (1975-01-01), Arikawa
patent: 4143926 (1979-03-01), Miller
patent: 4347569 (1982-08-01), Allen
patent: 4395761 (1983-07-01), Sato et al.
patent: 4466066 (1984-08-01), Saumwcher et al.
Bosch Techische Berichte, vol. 7, No. 2, 1980, pp. 65-94, Stuttgart, DE; H. Leiber et al.: "Antiblockiersystem (ABS) fur Personenkraftwagen".
Asami Ken
Masaki Syouichi
Nakashima Noriyuki
Sakai Kazunori
Tamura Kimio
Caldwell Sr. John W.
Nippondenso Co. Ltd.
Oberley Alvin
Toyota Jidosha & Kabushiki Kaisha
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