Driving force distributing apparatus for a vehicle
AssigneeFuji Jukogyo Kabushiki Kaisha
InventorRyuzo Sakakiyama
Life of this patent
Estimating the term…
Abstract
A four-wheel drive vehicle in which the engine output is transmitted to front wheels and to rear wheel through a transfer clutch. The control unit determines a road gradient from the output value of a longitudinal acceleration sensor at a stop, sets a lower limit on the basis of the road gradient and is prepared for a start by outputting a drive signal corresponding to lower limit to a clutch control valve for controlling the applying force of the transfer clutch. Thus, the applying force is set according to the road gradient so that the main drive wheels at the slope can be prevented from slipping by the minimum transmission torque.
Claims18
A driving force distributing apparatus for a vehicle, for transmitting a driving power directly to main drive wheels, and to auxiliary drive wheels via a coupling unit, comprising:
- basic torque setting means for setting a basic torque to be transmitted to said auxiliary drive wheels on the basis of driving states of the vehicle;
- road gradient correction coefficient setting means for determining a gradient correction coefficient corresponding to a gradient of a road by comparing an output value of a longitudinal acceleration sensor mounted on the vehicle and an acceleration determined on the basis of a speed of the vehicle;
- auxiliary drive wheel torque setting means for setting an auxiliary drive wheel torque by correcting said basic torque with said gradient correction coefficient;
- and
- driving means for driving said coupling unit to generate a transmission torque corresponding to said auxiliary drive wheel torque.
A driving force distributing apparatus for a vehicle for transmitting an engine output directly to main drive wheels, and to auxiliary drive wheels via a coupling unit, comprising:
- auxiliary drive wheel torque setting means for setting an auxiliary drive wheel torque on the basis of a road gradient determined on the basis of an output value of a longitudinal acceleration sensor mounted on the running vehicle at a low speed or at a stop;
- and
- driving means for driving said coupling unit to generate a transmission torque corresponding to said auxiliary drive wheel torque.
A driving force distributing apparatus for a vehicle for transmitting an engine output, in which an output of a prime mover is transmitted directly to main drive wheels, and to auxiliary drive wheels via a coupling unit, comprising:
- basic torque setting means for setting a basic torque to be transmitted to said auxiliary drive wheels, on the basis of a driving state of the vehicle;
- theoretical acceleration setting means for setting a theoretical acceleration at a time of running on a flat road on the basis of an equation of motion of the vehicle from the engine output and a driving force determined by preset vehicle specifications;
- estimated acceleration setting means for computing an estimated acceleration from a wheel speed;
- auxiliary drive wheel torque setting means for setting an auxiliary drive wheel torque on the basis of a road gradient determined by comparing body said theoretical acceleration and said estimated acceleration;
- and
- driving means for driving coupling unit to generate a transmission torque corresponding to said auxiliary drive wheel torque.
Dependencies are inferred from the claim text.