Abstract: A motor control system includes host control circuitry configured to generate a first control command; a plurality of motor control apparatuses configured to control a plurality of motors, respectively, based on the first control command; and reference information output circuitry configured to output reference information to one of the plurality of motor control apparatuses which is configured to control one of the plurality of motors. The reference information relates to control of the plurality of motors. Each of the plurality of motor control apparatuses corresponds to a corresponding motor among the plurality of motors and includes information sharing circuitry configured to share the reference information among the plurality of motor control apparatuses via data communication; command conversion circuitry configured to convert the reference information into a second control command; and motor control circuitry configured to control the corresponding motor based on the second control command.

Abstract: Provided is rotational-state-of-wheel detecting apparatus that can avoid output of an incorrect rotational direction during a halt of a wheel. In ECU 10, a signal input section 10a accurately detects wheel speeds and rotational directions of respective wheels 12, 14, 16, 18, and, based on the results, respective computers 10b, 10c, 10d execute ABS control, TC control, and VSC control. On this occasion, switching of the rotational direction is restricted with a computation result of wheel speed of zero, and it is thus feasible to prevent occurrence of a malfunction or state hunting being repetitive switching of signs, due to an external magnetic field during halts of the wheels 12, 14, 16, 18. This further optimizes the state control of a vehicle.

Abstract: An executed time of a backward slipping moderation control is counted by a timer, and after a predetermined period of time is elapsed, the control is terminated. Upon the termination of the control, a control of operation of a brake actuator is executed so that a wheel cylinder pressure is decreased with a gentle slope in comparison with a normal operation of the brake actuator for terminating the control. Where the backward slipping moderation control is executed by controlling a brake fluid pressure of the brake actuator, an acceleration &agr; of a vehicle is estimated. If the acceleration is larger than a predetermined value, a target pressure P is increased, thus generating a relatively large braking force.

Abstract: An executed time of a backward slipping moderation control is counted by a timer, and after a predetermined period of time is elapsed, the control is terminated. Upon the termination of the control, a control of operation of a brake actuator is executed so that a wheel cylinder pressure is decreased with a gentle slope in comparison with a normal operation of the brake actuator for terminating the control. Where the backward slipping moderation control is executed by controlling a brake fluid pressure of the brake actuator, an acceleration &agr; of a vehicle is estimated. If the acceleration is larger than a predetermined value, a target pressure P is increased, thus generating a relatively large braking force.

Abstract: Provided is rotational-state-of-wheel detecting apparatus that can avoid output of an incorrect rotational direction during a halt of a wheel. In ECU 10, a signal input section 10a accurately detects wheel speeds and rotational directions of respective wheels 12, 14, 16, 18, and, based on the results, respective computers 10b, 10c, 10d execute ABS control, TC control, and VSC control. On this occasion, switching of the rotational direction is restricted with a computation result of wheel speed of zero, and it is thus feasible to prevent occurrence of a malfunction or state hunting being repetitive switching of signs, due to an external magnetic field during halts of the wheels 12, 14, 16, 18. This further optimizes the state control of a vehicle.

Abstract: The present invention is directed to a braking control system for controlling a braking force applied to each wheel of a vehicle. A steep slope detector GD is provided for determining whether the vehicle is on a steep slope, when the rear end of the vehicle is located downward. The wheel speeds of rear wheels RR, RL are held to be zero by a stop holding device SH which is adapted to supply the hydraulic braking pressure discharged from an auxiliary pressure source AS to the rear wheel brake cylinders RR, RL, when the steep slope detector GD determines that the vehicle is on the steep hill, with the rear end of the vehicle located downward, and a braking operation sensor BD detects the depression of the brake pedal BP, with the rear end of the vehicle located downward, and when it is determined that the wheel speeds of front wheels FR, FL are zero and that the wheel speeds of the rear wheels RR, RL are not zero.

Abstract: The present invention is directed to a braking control system for controlling a braking force applied to each of front and rear wheels of a four-wheel drive vehicle, which has a front differential gear connected to the front wheels, a rear differential gear connected to the rear wheels, and a center differential gear connected to the front and rear differential gears. A wheel speed sensor is provided for detecting wheel speeds of the wheels. A non-contact detector is provided for determining whether at least one wheel is not contacting the ground in the vehicle's path, on the basis of the wheel speeds detected by the wheel sensor. A downhill detector is provided for determining whether the vehicle's path is on a downhill road. An engine brake detector is provided for determining whether the vehicle is under an engine brake.

Abstract: The present invention is directed to a traction control system for a four-wheel drive vehicle, which includes a braking operation detector for detecting operation of a brake pedal, an accelerating operation detector for detecting operation of an accelerator pedal, and a slip detector for detecting a slip of each wheel of the vehicle. A braking force controller is provided for controlling a pressure control apparatus to perform a traction control by supplying the hydraulic braking pressure discharged from an auxiliary pressure source to wheel brake cylinders operatively mounted on the wheels under a slip condition, when the accelerating operation detector detects the operation of the accelerator pedal and the slip detector detects the slip of at least one of the wheels.