Vehicle brake hydraulic pressure control apparatus and road surface friction coefficient estimating device
First Claim
1. A road surface friction coefficient judging device comprising:
- a first estimating module configured to estimate a first road surface friction coefficient based on a lateral acceleration;
a second estimating module configured to estimate a second road surface friction coefficient based on a longitudinal acceleration; and
a selecting module configured to select either the first road surface friction coefficient or the second road surface friction coefficient to thereby estimate a road surface friction coefficient of a road surface,wherein the selecting module has a limit steering judgment section configured to judge whether steering exceeding a limit of road surface conditions is performed based on at least a steering angle and a vehicle speed, andwherein the selecting module selects;
the first road surface friction coefficient or the second road surface friction coefficient, whichever smaller, as the road surface friction coefficient when the limit steering judgment section judges that steering exceeding the limit of road surface conditions is performed; and
the second road surface friction coefficient as the road surface friction coefficient when the limit steering judgment section judges that steering exceeding the limit of road surface conditions is not performed.
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Accused Products
Abstract
One embodiment provides a vehicle brake hydraulic controller including: an antilock braking controlling module configured to perform an antilock braking control in which a brake hydraulic pressure applied to wheel brakes is reduced under the condition that a slip-related amount has reached a pressure reduction threshold value; and a turning judging module configured to judge whether a vehicle is turning based on a steering angle, wherein, when the antilock braking control is performed and in the case that the turning judging module judges that the vehicle is turning, the antilock braking controlling module performs a turning pressure reduction control so as to: change the pressure reduction threshold values to be more easily reached by the slip-related amount than at the time of straight running; and change the pressure reduction amounts to be larger than that at the time of straight running.
75 Citations
7 Claims
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1. A road surface friction coefficient judging device comprising:
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a first estimating module configured to estimate a first road surface friction coefficient based on a lateral acceleration; a second estimating module configured to estimate a second road surface friction coefficient based on a longitudinal acceleration; and a selecting module configured to select either the first road surface friction coefficient or the second road surface friction coefficient to thereby estimate a road surface friction coefficient of a road surface, wherein the selecting module has a limit steering judgment section configured to judge whether steering exceeding a limit of road surface conditions is performed based on at least a steering angle and a vehicle speed, and wherein the selecting module selects; the first road surface friction coefficient or the second road surface friction coefficient, whichever smaller, as the road surface friction coefficient when the limit steering judgment section judges that steering exceeding the limit of road surface conditions is performed; and the second road surface friction coefficient as the road surface friction coefficient when the limit steering judgment section judges that steering exceeding the limit of road surface conditions is not performed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification