Anti-skid brake control system for automotive brake system with projection of vehicular speed representative data on the basis of longitudinal acceleration exerted on vehicle body
First Claim
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1. An anti-skid brake control system for an automotive brake system comprising:
- a hydraulic brake circuit comprising means for building up braking fluid pressure according to operational magnitude of a manually operable braking member and braking force generating means associated with a vehicular wheel for generating a braking force to decelerate said vehicular wheel;
pressure adjusting means, disposed within said hydraulic circuit, for adjusting pressure of a working fluid to be delivered to said braking force generating means, said pressure adjusting means being operable at least in a first mode for increasing braking pressure in said braking force generating means and in a second mode for decreasing said braking pressure in said braking force generating means;
first sensor means for monitoring rotation speed of said vehicular wheel to produce a wheel speed indicative sensor signal value representative of rotation speed of said vehicular wheel;
second sensor means for monitoring longitudinal acceleration exerted on a vehicular body by producing a longitudinal acceleration indicative sensor signal value;
first means for detecting a predetermined vehicular braking condition satisfying a predetermined anti-skid brake control condition for initiating anti-skid control operation;
second means for latching a first wheel speed indicative value corresponding to said wheel speed indicative sensor signal value at a predetermined timing in each skid cycle and for arithmetically deriving a vehicular deceleration indicative datum on the basis of said longitudinal acceleration indicative sensor signal value, and for driving a gradient of vehicular speed during vehicular deceleration on the basis of said longitudinal acceleration indicative sensor signal value;
third means for deriving a projected vehicular speed representative datum based on said first wheel speed indicative value and utilizing said gradient of vehicular speed; and
fourth means for controlling said pressure adjusting means between said first and second modes for maintaining said rotation speed of said vehicular wheel in a predetermined optimal relationship with said projected vehicular speed representative datum.
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Abstract
An anti-skid brake control system employs a technique for correcting a longitudinally based vehicular speed variation gradient by a road slop dependent correction value. The road slop dependent correction value is derived on the basis of an assumed road slop condition which is assumed on the basis of magnitude of increase of the braking pressure.
32 Citations
18 Claims
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1. An anti-skid brake control system for an automotive brake system comprising:
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a hydraulic brake circuit comprising means for building up braking fluid pressure according to operational magnitude of a manually operable braking member and braking force generating means associated with a vehicular wheel for generating a braking force to decelerate said vehicular wheel; pressure adjusting means, disposed within said hydraulic circuit, for adjusting pressure of a working fluid to be delivered to said braking force generating means, said pressure adjusting means being operable at least in a first mode for increasing braking pressure in said braking force generating means and in a second mode for decreasing said braking pressure in said braking force generating means; first sensor means for monitoring rotation speed of said vehicular wheel to produce a wheel speed indicative sensor signal value representative of rotation speed of said vehicular wheel; second sensor means for monitoring longitudinal acceleration exerted on a vehicular body by producing a longitudinal acceleration indicative sensor signal value; first means for detecting a predetermined vehicular braking condition satisfying a predetermined anti-skid brake control condition for initiating anti-skid control operation; second means for latching a first wheel speed indicative value corresponding to said wheel speed indicative sensor signal value at a predetermined timing in each skid cycle and for arithmetically deriving a vehicular deceleration indicative datum on the basis of said longitudinal acceleration indicative sensor signal value, and for driving a gradient of vehicular speed during vehicular deceleration on the basis of said longitudinal acceleration indicative sensor signal value; third means for deriving a projected vehicular speed representative datum based on said first wheel speed indicative value and utilizing said gradient of vehicular speed; and fourth means for controlling said pressure adjusting means between said first and second modes for maintaining said rotation speed of said vehicular wheel in a predetermined optimal relationship with said projected vehicular speed representative datum. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An anti-skid brake control system for an automotive brake system comprising:
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a hydraulic brake circuit comprising means for building up braking fluid pressure according to operational magnitude of a manually operable braking member, first braking force generating means, associated with a first vehicular wheel, for generating braking force to decelerate said first vehicular wheel, and second braking force generating means, associated with a second vehicular wheel, for generating braking force to decelerating said second vehicular wheel; first pressure adjusting means, disposed within said hydraulic circuit, for adjusting pressure of a working fluid to be delivered to said first braking force generating means, said first pressure adjusting means being operable at least in a first mode for increasing braking pressure in said first braking force generating means and in a second mode for decreasing braking pressure in said first braking force generating means; second pressure adjusting means disposed within said hydraulic circuit, for adjusting pressure of a working fluid to be delivered to said second braking force generating means, said second pressure adjusting means being operable at least in a first mode for increasing braking pressure in said second braking force generating means and in a second mode for decreasing braking pressure in said second braking force generating means; first sensor means for monitoring rotation speed of said first vehicular wheel to produce a first wheel speed indicative sensor signal value representative of rotation speed of said first vehicular wheel; second sensor means for monitoring rotation speed of said second vehicular wheel to produce a second wheel speed indicative sensor signal value representative of rotation speed of said second vehicular wheel; means for comparing said first and second wheel speed indicative sensor signal values, and for selecting one having greater value as a common wheel speed indicative sensor signal value; third sensor means for monitoring longitudinal acceleration exerted on a vehicular body by producing a longitudinal acceleration indicative sensor signal value; first means for detecting a predetermined vehicular braking condition satisfying a predetermined anti-skid brake control condition for initiating anti-skid control operation; second means for latching a wheel speed indicative datum corresponding to said common wheel speed indicative sensor signal value at a predetermined timing in each skid cycle and for arithmetically deriving a vehicular deceleration indicative datum on the basis of said longitudinal acceleration indicative sensor signal value, and for deriving a gradient of vehicular speed during vehicular deceleration on the basis of said longitudinal acceleration indicative sensor signal value; third means for deriving a projected vehicular speed representative datum based on said first wheel speed indicative datum and utilizing said gradient of vehicular speed; and fourth means for controlling said first and second pressure adjusting means between said first and second modes for maintaining said rotation speeds of said first and second vehicular wheels in a predetermined optimal relationship with said projected vehicular speed representative datum. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A system for projecting vehicular speed representative data on the basis of a wheel speed, comprising:
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first sensor means for monitoring rotation speed of a vehicular wheel to produce a wheel speed indicative sensor signal value representative of rotation speed of said vehicular wheel; second sensor means for monitoring longitudinal acceleration exerted on a vehicular body for producing a longitudinal acceleration indicative sensor signal value; first means for latching a first wheel speed indicative value corresponding to said wheel speed indicative sensor signal value at a predetermined timing and for arithmetically deriving a vehicular deceleration indicative datum or the basis of said longitudinal acceleration indicative sensor signal value and for deriving a gradient of vehicular speed during vehicular deceleration on the basis of said longitudinal acceleration indicative sensor signal value; and third means for deriving a projected vehicular speed representative datum based on said first wheel speed indicative value and utilizing said gradient of vehicular speed. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification