Advics Co., Ltd.

Hirohisa Tanaka

Akitaka Nishio

Masanobu Fukami

Kiyohito Takeuchi

Seiichi Kojima

Kazuhiro Kato

Tatsuya Yano

Yoshimasa Yamamoto

This apparatus is applied to a vehicle brake apparatus provided with a hydraulic booster operated by utilizing an accumulator hydraulic pressure that is adjusted to a predetermined high pressure (not less than a lower limit value) by a drive control of a hydraulic pump. This apparatus executes an automatic pressurization control by controlling plural solenoid valves with the use of the accumulator hydraulic pressure. The increasing slope of the brake hydraulic pressure during the automatic pressurization control is determined on the basis of the vehicle motion state. The increasing slope is restricted to be not more than a predetermined restriction value, in the case where the accumulator hydraulic pressure at the time of starting the automatic pressurization control is less than 'a reference hydraulic pressure that is greater than a minimum value of the accumulator hydraulic pressure necessary for assisting the brake operation by the hydraulic booster and smaller than the lower limit value'.

Vehicle motion control apparatus

A wheel-speed-sensor-anomaly detection apparatus detects anomaly of wheel speed sensors of a vehicle. When a difference between the minimum wheel speed among detected wheel speeds and the smallest value among the remaining wheel speeds is greater than a predetermined threshold value, in principle, a wheel speed sensor of the wheel corresponding to the minimum wheel speed is determined to be anomalous. Meanwhile, when a wheel having a lowered tire air pressure (air-pressure-lowered wheel) is present and a road surface on which the vehicle is currently traveling is a low-&#x3bc; road surface, the operation of detecting anomaly of the wheel speed sensors is prohibited. This operation reliably prevents erroneous detection of anomaly of the wheel speed sensor of the air-pressure-lowered wheel, which erroneous detection would otherwise occur due to the locking tendency of the air-pressure-lowered wheel occurring because of decreased tire air pressure, in particular, on a low-&#x3bc; road surface.

Apparatus for detecting anomaly of wheel speed sensors

This vehicle motion control apparatus obtains a yaw rate deviation by subtracting the value (actual-yaw-rate-after-low-pass-filter-process Yrfilter), which is obtained by providing with a time constant &#x3c4;(&#x3e;&#x3c4;) the low-pass filter process to the actual yaw rate Yr obtained from the yaw rate sensor incorporated in the HU, from the value (turning-angle-yaw-rate-after-low-pass-filter-process Yrtfilter) obtained by providing with the time constant &#x3c4;the low-pass filter process to the turning angle yaw rate Yrt obtained on the basis of the actual steering angle obtained from the steering angle sensor, which is provided separate from the hydraulic unit HU. When this yaw rate deviation exceeds the threshold value Yrth (time t), this apparatus starts an under-steer suppression control.

Growing community of inventors

Nagoya, Japan

Hirohisa Tanaka