Anti-skid brake system with reset of thresholds due to changing road surface cofficient
First Claim
1. An anti-skid brake system for an automotive vehicle, which controls a braking force so as to lock no wheel at the moment of braking and which alters a control value for controlling the braking force in accordance with an assumed road surface friction coefficient μ
- , wherein;
the braking force is set to shift from a state in which the braking force is increased to a state in which the braking force is retained when a magnitude of deceleration of the wheel becomes greater than a first predetermined threshold value;
the first predetermined threshold value is set to become smaller as a road surface friction coefficient μ
is smaller; and
means for altering the assumed road surface friction coefficient μ
to a higher road surface friction coefficient μ
when a period of time required between the moment at which control for increasing the braking force starts and the moment at which control for retaining the braking force starts after the control for increasing the braking force is equal to or shorter than a predetermined period of time.
1 Assignment
0 Petitions
Accused Products
Abstract
A shift to control for retaining the braking force from the control for elevating the braking force is implemented when deceleration of the wheel exceeds a first predetermined threshold value when the wheels are braked. The first predetermined threshold value is so set as to become smaller as an assumed road surface friction coefficient μ is smaller. The first threshold value is further altered to a larger value by altering the assumed road surface friction coefficient μ to a higher one when the period of time required from the start of the control for elevating the braking force to the start of the following control for retaining the braking force is equal to or shorter than a predetermined period of time.
9 Citations
22 Claims
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1. An anti-skid brake system for an automotive vehicle, which controls a braking force so as to lock no wheel at the moment of braking and which alters a control value for controlling the braking force in accordance with an assumed road surface friction coefficient μ
- , wherein;
the braking force is set to shift from a state in which the braking force is increased to a state in which the braking force is retained when a magnitude of deceleration of the wheel becomes greater than a first predetermined threshold value; the first predetermined threshold value is set to become smaller as a road surface friction coefficient μ
is smaller; andmeans for altering the assumed road surface friction coefficient μ
to a higher road surface friction coefficient μ
when a period of time required between the moment at which control for increasing the braking force starts and the moment at which control for retaining the braking force starts after the control for increasing the braking force is equal to or shorter than a predetermined period of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- , wherein;
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20. An anti-skid brake system for an automotive vehicle, comprising:
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deceleration detecting means for detecting a magnitude of deceleration of a wheel; slip value detecting means for detecting a slip value indicating a tendency of locking the wheel; braking force controlling means for controlling a braking force by increasing, decreasing and retaining the braking force so as not to lock the wheel at the moment of braking, in response to output from the deceleration detecting means and the slip value detecting means; road surface friction coefficient μ
assuming means for assuming a road surface friction coefficient μ
on the basis of a predetermined condition;threshold value altering means for altering a controlling threshold value for controlling the braking force controlling means on the basis of the road surface friction coefficient μ
assumed by the road surface friction coefficient μ
assuming means; androad surface friction coefficient μ
altering means for altering the road surface friction coefficient μ
assumed by the road surface friction coefficient μ
assuming means;wherein the braking force controlling means is arranged to shift from a state in which control for increasing the braking force is performed to a state in which control for retaining the braking force is performed when the magnitude of deceleration of the wheel reaches a value greater than the first predetermined threshold value; wherein the threshold value altering means is set to make the first predetermined threshold value smaller as the road surface friction coefficient μ
becomes smaller; andwherein the road surface friction coefficient μ
altering means is set to alter the road surface friction coefficient μ
assumed by the road surface friction coefficient μ
assuming means to a value having a higher road surface friction coefficient μ
when a period of time required from the moment when the control for increasing the braking force starts to the moment when the control for retaining the braking force starts after the control for increasing the braking force is equal to or longer than a predetermined period of time. - View Dependent Claims (21, 22)
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Specification