Vehicular brake control apparatus and vehicular brake control method
First Claim
1. A vehicular brake control apparatus comprising:
- a connecting state coupling interposed between a front-wheel drive shaft that transmits a driving force to a front-wheel side and a rear-wheel drive shaft that transmits a driving force to a rear-wheel side, and that changes a connecting state between the front-wheel drive shaft and the rear-wheel drive shaft;
brakes, each of which is provided in a corresponding one of wheels to apply a braking force to the corresponding one of the wheels; and
a brake controller that performs operation control of the brakes in accordance with a running state of the vehicle and that controls braking forces to be applied to the wheels individually, wherein the brake controller;
(a) prohibits brake control if conditions for starting brake control by the brake controller have been fulfilled during a period in which the coupling causes a great connecting strength to act between the front-wheel drive shaft and the rear-wheel drive shaft, and (b) continues brake control if the connecting state between the front-wheel drive shaft and the rear-wheel drive shaft has been changed during perfoarmance of the brake control such that the great connecting strength acts between the front-wheel drive shaft and the rear-wheel drive shaft while brake control is being performed by the brake controller.
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Accused Products
Abstract
A vehicle is equipped with a coupling such as, for example, a center differential or a variable clutch, that transmits a driving force from an engine to a front-wheel drive shaft and a rear-wheel drive shaft while allowing a difference in rotational speed therebetween and a brake controller that individually controls braking forces to be applied to wheels in accordance with a running state of the vehicle. A vehicular brake controller prohibits braking force control from being started if the coupling is in its locked state or when the coupling causes a relatively great connecting strength to exist between the front-wheel and rear-wheel drive shafts. While braking force control is being performed by the brake controller, braking force control is continued even if there is a command to cause the coupling to be locked or to achieve the great coupling strength.
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Citations
28 Claims
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1. A vehicular brake control apparatus comprising:
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a connecting state coupling interposed between a front-wheel drive shaft that transmits a driving force to a front-wheel side and a rear-wheel drive shaft that transmits a driving force to a rear-wheel side, and that changes a connecting state between the front-wheel drive shaft and the rear-wheel drive shaft;
brakes, each of which is provided in a corresponding one of wheels to apply a braking force to the corresponding one of the wheels; and
a brake controller that performs operation control of the brakes in accordance with a running state of the vehicle and that controls braking forces to be applied to the wheels individually, wherein the brake controller;
(a) prohibits brake control if conditions for starting brake control by the brake controller have been fulfilled during a period in which the coupling causes a great connecting strength to act between the front-wheel drive shaft and the rear-wheel drive shaft, and (b) continues brake control if the connecting state between the front-wheel drive shaft and the rear-wheel drive shaft has been changed during perfoarmance of the brake control such that the great connecting strength acts between the front-wheel drive shaft and the rear-wheel drive shaft while brake control is being performed by the brake controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A vehicular brake control apparatus comprising:
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a connecting state coupling interposed between a front-wheel drive shaft that transmits a driving force to a front-wheel side and a rear-wheel drive shaft that transmits the driving force to a rear-wheel side, and that changes a connecting state between the front-wheel drive shaft and the rear-wheel drive shaft;
brakes, each of which is provided in a corresponding one of wheels to apply a braking force to the corresponding one of the wheels; and
a controller that (a) performs operation control of the brakes in accordance with a running state of the vehicle and that controls braking forces to be applied to the wheels individually, and (b) restricts changes in the connecting state by the connecting state coupling while brake control is being performed by controller. - View Dependent Claims (11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 23, 25, 26, 27, 28)
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17. A brake control method for a vehicle having (a) a connecting state coupling interposed between a front-wheel drive shaft that transmits a driving force to a front-wheel side and a rear-wheel drive shaft that transmits the driving force to a rear-wheel side, and that changes a connecting state between the front-wheel drive shaft and the rear-wheel drive shaft, (b) brakes, each of which is provided in a corresponding one of wheels to apply a braking force to the corresponding one of the wheels, and (c) a controller that performs operation control of the brakes in accordance with a running state of the vehicle and that controls braking forces to be applied to the wheels individually, comprising the steps of:
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prohibiting brake control if conditions for starting brake control by the brake controller have been fulfilled during a period in which the coupling causes a great connecting strength to act between the front-wheel drive shaft and the rear-wheel drive shaft; and
continuing brake control by the brake controller if the connecting state between the front-wheel drive shaft and the rear-wheel drive shaft has been changed during performance of the brake control such that the great connecting strength acts between the front-wheel drive shaft and the rear-wheel drive shaft, while brake control is being performed by the brake controller.
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24. A brake control method for a vehicle having (a) a connecting state coupling interposed between a front-wheel drive shaft that transmits a driving force to a front-wheel side and a rear-wheel drive shaft that transmits the driving force to a rear-wheel side, and that changes a connecting state between the front-wheel drive shaft and the rear-wheel drive shaft, (b) brakes, each of which is provided in a corresponding one of wheels to apply a braking force to the corresponding one of the wheels, and (c) a controller that performs operation control of the brakes in accordance with a running state of the vehicle and that controls braking forces to be applied to the wheels individually, comprising the step of:
restricting changes in the connecting state by the connecting state coupling while brake control is being performed by the controller.
Specification