| 摘要 |
Upon determining than an over-steered state exits, a feedback control coefficient for a rear wheel total drive force is set to 0 and a feedback control coefficient for a rear wheel drive force difference is also set to 0 to impose a two-wheel drive state. As a result, it is possible to avoid a turn cruising instability caused by cruising in four-wheel drive in an over-steered state. Upon determining that an under-steered state exists, the feedback control coefficients are set such that four-wheel drive is allowed but a drive force difference is not set between the left and right rear wheels. As a result, when the under-steered state exists, excellent traction can be enjoyed by operating in four-wheel drive and the phenomenon of riding up a canted road surface due to a drive force difference set between the left and right rear wheels can be avoided.
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