CONTROL SYSTEM FOR FOUR-WHEEL DRIVE VEHICLE
1 Assignment
0 Petitions
Accused Products
Abstract
In a control system for a four-wheel drive vehicle, when the four-wheel drive vehicle is four-wheel driven full time (that is, at all times), the difference in rotation of each wheel occurring due to the difference in air pressure within each tire, is differentiated from the difference in rotation of each wheel occurring due to cornering or the state of the road surface, and is correspondingly corrected so as to distribute the driving force to the four wheels. Thus, even if the difference in rotation of each wheel occurs due to the air pressure within each tire, the malfunction in which four-wheel driving is controlled based on the erroneous determination that the difference in rotation of each wheel is due to cornering or the state of the road surface can be prevented from occurring.
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Citations
14 Claims
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1-7. -7. (canceled)
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8. A control system for a four-wheel drive vehicle, the control system comprising:
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a speed change part configured to transfer a driving force from an engine of the vehicle, and to output a speed change driving force through a specific gear depending on an adjustment status of an electromagnetic valve; a transfer case part configured to transfer the speed change driving force from said speed change part and to drive either a rear wheel drive shaft of the vehicle or a front wheel drive shaft of the vehicle through an operation of a built-in motor; a tire pressure sensing part installed to measure an air pressure in each tire of the vehicle; and an electronic control part configured to calculate the rotations of the corresponding tire according to the measured tire air pressure value provided by said tire pressure sensing part, to compare counted rotations with actual rotations of the corresponding tire to judge whether the corresponding tire exhibits a rotation difference, and, when the respective wheel exhibits a rotation difference arising from a tire air pressure difference, to output control signals for the operation and control of said transfer case to distribute said speed change driving force, so as to offset the rotation difference. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification