Traction control apparatus and method for four-wheel drive vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorYoshiaki Irie
Life of this patent
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Abstract
A traction control apparatus for a four-wheel drive vehicle simultaneously sets an equal control amount ΔVWRL=ΔVWRR for brake devices on the side of rear-left and rear-right wheels if at least one of the rear wheels is driven with a low grip degree. Thereby the slip tendency of the rear wheels is weakened, and the behavior of the vehicle is shifted in a stabilizing direction.
Claims14
A traction control apparatus disposed in a four-wheel drive vehicle in which driving torques of a drive source are distributed to front-left and front-right wheels and to rear-left and rear-right wheels, to control driving forces generated between the respective wheels and a road surface, comprising:
- brake devices disposed in the respective wheels and generating predetermined braking forces to brake rotation of the wheels;
- and
- a controller that controls the braking forces generated in the respective brake devices, the controller simultaneously generates an equal braking force in the brake devices corresponding to the rear-left and rear-right wheels if it is judged that at least one of the rear-left and rear-right wheels tends to slip.
A traction control method for controlling a four-wheel drive vehicle in which driving torques of a drive source are distributed to front-left and front-right wheels and to rear-left and rear-right wheels, to control driving forces generated between the respective wheels and a road surface, the four-wheel drive vehicle including brake devices disposed in the respective wheels to generate predetermined braking forces to brake rotation of the wheels, the method comprising the step of:
- controlling the braking forces generated in the respective brake devices by simultaneously generating an equal braking force in the brake devices corresponding to the rear-left and rear-right wheels if it is judged that at least one of the rear-left and rear-right wheels tends to slip.
Dependencies are inferred from the claim text.