| 摘要 |
An auxiliary braking mechanism is operated to increase a braking effect, only after it is determined whether adding the auxiliary braking mechanism during vehicle braking by a main braking mechanism will increase the braking effect. In the case where a main braking force is generated on a tire by pressing of friction material in a caliper on a disc rotor, and an approximate speed from an acceleration sensor is smaller than a predetermined value, while an outside temperature from an outside temperature sensor is within a predetermined temperature range including the freezing point, an auxiliary brake ECU estimates that water or a mixture of water and ice are present on a frozen road surface, determines that a road surface mu can be increased through operation of the auxiliary braking mechanism, and scatters sand on the road surface using a particle scattering device. Thus, it is possible to prevent lowering of the road surface mu by scattering sand on the completely frozen road surface.
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