Vehicular parking brake apparatus and control method thereof

A vehicular parking brake apparatus, comprising:

• a drive power source provided on a vehicle body of a vehicle;
• a parking brake including a brake provided on a wheel that is connected to the vehicle body via a suspension device, and a transfer device that mechanically transfers a drive power of the drive power source to the brake, the transfer device including a transfer member train;
• and
• a controller that controls an operating force of the parking brake by increasing/reducing the drive power of the drive power source while reducing an overshoot of a state of slip of the wheel corresponding to the parking brake, the controller including an antilock controller portion that commonly controls an operating force of the transfer member train, wherein the antilock control portion commonly controls the operating force of the transfer member train based on the state of slip of the wheel of a right-side wheel and a left-side wheel that exhibits a greater slip, and the controller includes a stroke control portion that controls the operating force of the transfer member train so that a drive stroke approaches a target stroke determined based on the state of slip of the wheel.

A vehicular parking brake apparatus, comprising:

• a drive power source;
• a parking brake that is operated by driving the drive power source, wherein a transfer device mechanically transfers a drive power of the drive power source to the parking brake, the transfer device including a transfer member train;
• and
• a parking brake controller that controls an operating force of the parking brake by switching the drive power source at least between an increase state in which the drive power source is operated so that the operating force of the parking brake is increased, and a decrease state in which the drive power source is operated so that the operating forces of the parking brake is decreased, based on a state of slip of a wheel corresponding to the parking brake, the controller including an antilock control portion that commonly controls an operating force of the transfer member train, wherein the antilock control portion commonly controls the operating force of the transfer member train based on the state of slip of the wheel of a right-side wheel and a left-side wheel that exhibits a greater slip, and the controller includes a stroke control portion that controls the operating force of the transfer member train so that a drive stroke approaches a target stroke determined based on the state of slip of the wheel.

A control method of a vehicular parking brake apparatus, comprising:

• determining a change in a state of rotation of one of a right-side wheel and a left-side wheel;
• determining a state of slip of one of the right-side wheel and the left-side wheel that exhibits a greater change in the state of rotation;
• and
• commonly controlling an operating force of a right-side parking brake and an operating force of a left-side parking brake based on the determined state of slip, wherein an operating force of a transfer member train is commonly controlled based on the state of slip of the wheel of the right-side wheel and the left-side wheel that exhibits a greater slip, and the operating force of the transfer member train is controlled so that a drive stroke approaches a target stroke determined based on the state of slip of the wheel.

A control method of a vehicular parking brake apparatus, comprising:

• determining a state of slip of a wheel corresponding to a parking brake;
• increasing/decreasing a drive power of a drive power source that operates the parking brake while reducing an overshoot of the state of slip;
• and
• controlling an operating force of the parking brake by increasing/decreasing the drive power, wherein an operating force of a transfer member train is commonly controlled based on the state of slip of the wheel of a right-side wheel and a left-side wheel that exhibits a greater slip and the operating force of the transfer member train is controlled so that a drive stroke approaches a target stroke determined based on the state of slip of the wheel.

A control method of a vehicular parking brake apparatus, comprising:

• determining a state of slip of a wheel corresponding to a parking brake;
• operating a drive power source that operates the parking brake, to increase an operating force of the parking brake, based on the state of slip;
• operating the drive power source to decrease the operating force of the parking brake if the state of slip exceeds a predetermined upper threshold;
• and
• operating the drive power source to increase an operating force of the parking brake at a time point when the state of slip of the wheel starts to decrease from a peak value, wherein an operating force of a transfer member train is commonly controlled based on the state of slip of the wheel of a right-side wheel and a left-side wheel that exhibits a greater slip and the operating force of the transfer member train is controlled so that a drive stroke approaches a target stroke determined based on the state of slip of the wheel.