Four-wheel drive system

Details Four-wheel drive system Four-wheel drive system

2008-07-01

2008-07-01

Winner, Tony (Department: 3611)

Motor vehicles

Having four wheels driven

With manually operated means for disengaging drive to one or...

C180S248000, C701S089000, C701S072000, C701S090000

Reexamination Certificate

active

11017724

ABSTRACT:
To provide a four-wheel drive system which improves running performance of an automotive vehicle by inhibiting a driving torque from becoming insufficient upon occurrence of a slip.An R slip sensing means of a DC motor torque calculating means senses a slip due to a spin of rear wheels. When the rear wheel slip is sensed, an R slip DC-motor-torque correcting means corrects a torque of the rear wheels so that a driving force of the rear wheels is reduced and then increased. The R slip DC-motor-torque correcting means reduces a driving torque of the rear wheels to eliminate the slip and holds the reduced driving torque until the slip is eliminated, and then increases the driving torque to a value lower than a value which the driving torque has taken at the time of occurrence of the slip. The driving torque is increased to a predetermined limit value depending on the number of slips.

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European Search Report dated Sep. 11, 2006 (Three (3) pages).
Japanese Office Action dated Feb. 6, 2007 with English translation (Seven (7) Pages).

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