| 摘要 |
PURPOSE:To calcurate accurately and simply the to-ground speed used as reference for setting of threshold value, in a drive force control device for 4-wheel drive car etc., by selecting the minimum value from revolving speeds of wheels, and calculating the to-ground speed based on the min. revolving speed. CONSTITUTION:Revolving speeds of wheels are sensed by rotation sensors Sa-Sd and revolving speed calculating parts 10a-10d and entered into a min. value sensing means 12 and a control part 14. The min. value sensing means 12 selects the min. value from the entered revolving speeds and the selected value is entered into a threshold setting means 13. The threshold value setting means 13 sets a threshold value used as reference for running control based on this min. revolving speed 12, and the set value is entered into the above-mentioned control part 14. The control part 14 compares the revolving speeds 10a-10d of the wheels to the threshold value, and control signals are passed to accelerator operating members 7 and an engine control part 4. This construction allows easy and accurate calculation of the to-ground speed.
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