Method of controlling 4-wheel drive vehicles
AssigneeNtn Corporation
InventorYoshitaka Nagano
Life of this patent
Estimating the term…
Abstract
A method of controlling a four-wheel drive vehicle is provided which permits reverse travel on a low-μ road without engaging shock. In a four-wheel drive vehicle in which two wheel drive and four-wheel drive can be changed over by means of a rotation transmission device having a two-way clutch and an electromagnetic coil for controlling engagement of the two-way clutch, the traveling direction of the vehicle is detected with rotation sensors for detecting the rotational direction of the front and rear wheels, and if the traveling direction of the vehicle is different from the traveling direction of the range, the two-way clutch is engaged.
Claims8
A method of controlling a four-wheel drive vehicle with an automatic transmission, said vehicle being provided with a rotation transmission device which permits selection between two-wheel drive and four-wheel drive by changing over transmission and shutoff of driving torque to front wheels, said rotation transmission device comprising a two-way clutch and an electromagnetic coil for controlling engagement of said two-way clutch, wherein if the traveling direction of the vehicle detected by means of rotation sensors for detecting the rotational direction of a propeller shaft for rear wheels or front wheels or that of the front and rear wheels is different from the traveling direction of the range, the vehicle is judged to be traveling in reverse and said electromagnetic coil is energized to engage said two-way clutch for four-wheel drive.
A method of controlling a four-wheel drive vehicle with an automatic transmission, said vehicle being provided with a rotation transmission device which permits selection between two-wheel drive and four-wheel drive by changing over transmission and shutoff of driving torque to front wheels, said rotation transmission device comprising a two-way clutch and an electromagnetic coil for controlling engagement of said two-way clutch, wherein if the range before changeover to N-range is different from the range after changeover to N-range and the vehicle speed in the N-range is not below a predetermined speed, the vehicle is judged to be traveling in reverse and said electromagnetic coil is energized to engage said two-way clutch for four-wheel drive.
A method of controlling a four-wheel drive vehicle with an automatic transmission, said vehicle being provided with a rotation transmission device which permits selection between two-wheel drive and four-wheel drive by changing over transmission and shutoff of driving torque to front wheels, said rotation transmission device comprising a two-way clutch and an electromagnetic coil for controlling engagement of said two-way clutch, wherein if the travelling direction of the range before changeover to N-range is the same as that of the range after changeover from N-range and the vehicle speed does not sink below a predetermined speed while the vehicle is travelling in N-range or if the vehicle speed when the range is changed over to N-range from other range is below a predetermined speed and the deceleration of the rear wheels have exceeded a predetermined value in several seconds after changeover from N-range to other range, the vehicle is judged to be traveling in reverse and said electromagnetic coil is energized to engage said two-way clutch for four-wheel drive.
A method of controlling a four-wheel drive vehicle with a manual transmission, said vehicle being provided with a rotation transmission device which permits selection between two-wheel drive and four-wheel drive by changing over transmission and shutoff of driving torque to front wheels, said rotation transmission device comprising a two-way clutch and an electromagnetic coil for controlling engagement of said two-way clutch, wherein if the traveling direction of the vehicle detected by means of rotation sensors for detecting the rotational direction of a propeller shaft for rear wheels or front wheels or the rotational direction of the front and rear wheels is different from the driving direction of the vehicle, and if the degree of opening of the accelerator is above a value during idling, the vehicle is judged to be traveling in reverse and said electromagnetic coil is energized to engage said two-way clutch for four-wheel drive.
Dependencies are inferred from the claim text.