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Brake pressure control apparatus
| Details |
Inventors: Kuwana, Kazutaka; Yoshida, Tsuyoshi; Sakane, Shinsuke;
Assignee: Aisin Seiki Kabushiki Kaisha (Kariya, JP)
Primary Examiner: Chin; Gary
Assistant Examiner:
Attorney, Agent or Firm: Finnegan, Henderson, Farabow, Garrett and Dunner
Brake control apparatus, having an antiskid control for decreasing skidding of wheels are provided by segmenting a brake control mode into three domains or more including "reducing", "hold" and "intensifying". A minimal memory capacity is provided to store constants for specifying functions indicating boundaries of the control mode domains, and the constants are particularly given to coordinate with a cars deceleration. Thus, uniformity may be obtained between resulting operations and decisions. |
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DETAILED DESCRIPTION A first object of the invention is to control a wheel brake pressure more appropriately and smoothly, and a second object is to decrease a memory capacity for loading a reference value for deciding or determining a brake pressure control mode.
In a first aspect, a brake pressure control mode is divided into three or more segments, including "reducing", "hold" and "intensifying"; memory means for storing a constant to specify a function indicating a boundary line for segmenting into a "reducing" domain, a "hold" domain and an "intensifying" domain is provided in a two-dimensional plane with an operation parameter determined by rotational speed of the wheel, the reference speed, and wheel rotation acceleration as a variable; a function calculated value is obtained through substituting or using one of the operation parameters corresponding to the wheel rotational speed of the wheel which is detected by a wheel speed detecting means and the reference speed computed by an arithmetic means, and the wheel rotation acceleration, and the aforementioned constant of the function, which is compared with the other to decide the "reducing", "intensifying" or "hold"; the wheel brake pressure is reduced when decided to be "reducing", increased when decided to be "intensifying", and is maintained when decided to be "hold".
In a second aspect, for further smoothing control of the brake pressure, a brake pressure control characteristic is modified in accordance with a friction factor .
mu.
of the road surface.
Consequently, the constant for specifying the function is given in a plural set or multiples coordinated with the car deceleration.
Then, "reducing", "hold" or "intensifying" is decided as described, by detecting the car deceleration and specifying the aforementioned constant coordinated with the car deceleration.
Further, the car is provided with an acceleration sensor (G sensor), and the car deceleration may be detected thereby.
However, a differential value of the reference speed is detected as deceleration in the preferred embodiment of the invention which will be described hereinafter
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