Patent ID: 7434647

Claim:
A driving force control apparatus for a four-wheel drive vehicle configured to transmit a driving force of a prime mover directly to a left and a right main driving wheel and to a left and a right sub-driving wheel through a clutch, said apparatus comprising: a rotational speed detecting means for detecting a rotational speed of each of said main driving wheels and said sub-driving wheels; a fastening force setting means for setting a fastening force of said clutch in accordance with a difference between the detected rotational speeds of said main driving wheels and said sub-driving wheels; a slip stop state determining means for determining that said four-wheel drive vehicle is in a slip stop state when at least one of the detected rotational speeds of said wheels is equal to or lower than a predetermined rotational speed; a fastening force correcting means for correcting the fastening force of said clutch set by said fastening force setting means when said slip stop state determining means determines that said four-wheel drive vehicle is in the slip stop state; and a counting means for counting the number of times said slip stop state determining means determines that said four-wheel drive vehicle is in the slip stop state, wherein said slip stop state determining means determines that said four-wheel drive vehicle is in the slip stop state when at least one wheel is rotating at a rotational speed equal to or lower than the predetermined rotational speed for a first predetermined time or longer, and wherein said fastening force correcting means corrects said clutch for the fastening force in accordance with the counted count value.