Honda Giken Kogyo Kabushiki Kaisha

Yutaka Maruyama

Yutaka Horiuchi

Toshio Yahagi

Susumu Takahashi

Ryo Suzuki

Yoshikazu Nojiri

An improved traction control system for a vehicle which ensures that when a driver has performed a voluntary operation to reduce the driven wheel speed during carrying-out of a traction control, a deceleration greater than required is avoided, thereby avoiding an uncomfortable feeling provided to the driver. The improvement to the traction control system includes a control unit for stopping the traction control in response to the driver's operation to reduce the driven wheel speed during carrying-out of the traction control.

Traction control system for vehicle

In a vehicle behavior control system, a failure of a wheel speed sensor is detected by a wheel speed sensor failure detecting device based on the mutual comparison of wheel speeds detected by wheel speed sensors, respectively. When the failure of the wheel speed sensor is detected, a preselected fail-safe operation is carried out by a fail-safe device. A fail-safe operation prohibiting signal is output only for a predetermined time from the establishment of a state in which the operation of a parking brake is detected by a parking brake operation detecting device and a during-traveling signal is output from a during-traveling signal generated device. When the fail-safe operation prohibiting signal is output, the fail-safe operation by the fail-safe device is prohibited by a fail-safe operation prohibiting device.

Vehicle-behavior control system with wheel speed failure detection

In an anti-lock brake control system, an actuator is controlled based on at least a slip rate determined in a slip rate calculating device and an output from a low-pass filter for filtering a wheel acceleration determined in a wheel acceleration calculating device, thereby switching-over the braking-pressure reducing, maintaining and increasing modes from one to another. The braking pressure-reduction control provided by an operation control device is terminated in response to the wheel acceleration determined in the wheel acceleration calculating device becoming equal to or larger than a preset value. Thus, it is possible to prevent an excessive pressure reduction during an anti-lock brake control on a road surface having a high coefficient of friction.

Anti-lock brake control system for vehicle

In an anti-lock brake control system for a vehicle, first presumed vehicle speeds are calculated in first vehicle speed calculating devices for every wheel based on wheel speeds detected by wheel speed detecting sections. A second presumed vehicle speed is calculated in a second vehicle speed calculating device based on the value of a lower one of the first presumed vehicle speeds calculated in the first vehicle speed calculating devices corresponding to the left and right rear wheels. A higher one of the first presumed vehicle speeds calculated in each of the first vehicle speed calculating devices and the second presumed vehicle speed calculated in the second vehicle speed calculating device is selected as a presumed vehicle speed corresponding to the wheel in a high-select device. The operations of actuators are controlled based on results of calculation of slip rates of wheels based on presumed vehicle speeds and wheel speeds for every wheel. Thus, when a different-diameter tire has been mounted on any of the wheels, a presumed vehicle speed can be presumed with good accuracy to carry out an appropriate anti-lock brake control.

Growing community of inventors

Wako, Japan

Yutaka Maruyama