| 摘要 |
A gear control means determines the gear position of an automatic transmission based on a vehicle speed V and throttle opening T input from a vehicle speed sensor and throttle opening sensor, and on a predetermined gear change-over lines which take form of kinked lines expressing "vehicle speed/throttle opening" characteristics for up-shifting and down-shifting respectively. The gear control means is provided with a memory unit and a gear determining unit. To increase the freedom in setting the gear change-over lines, the memory unit first stores the coordinates (x1i, y1i) and (x2i, y2i) of the two ends of each of the linear portions forming the kinked lines, and the gear determining unit selects the linear portion for which the expression x2i>V is satisfied and having the minimum value of x2i, and determines that a shift to higher gear position should be made if the condition (T-y1i) (x2i-x1i)<(V-x1i)(y2i-y1i) occurs with respect to a kinked line for up-shifting, or that a shift to lower gear position should be made if the condition (T-y1i)(x2i-x1i)>(V-x1i)(y2i-y1i) occurs with respect to a kinked line for down-shifting.
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