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US 5,672,139 AGranted
Drive force controller for an automatic transmission
AssigneeUnisia Jecs Corporation
InventorMasanobu Horiguchi
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AssigneeUnisia Jecs Corporation
InventorMasanobu Horiguchi
Estimating the term…
The present invention provides for a rapid down-shift to meet an insufficient drive force due to an increase in running resistance such as when ascending a slope. Speed change control is carried out by selecting a speed change step based on the vehicle speed and throttle opening. When there is no speed change requirement, the current running resistance is computed, and the maximum drive force for the current speed change step computed. The maximum drive force is computed based on the down-shift throttle opening corresponding to the current vehicle speed on a down-shift line from the current speed change step to a speed change step on a lower speed side. The running resistance and maximum drive force are compared, and when the maximum drive force is less than the running resistance a forceful down-shift is made.
A control apparatus for an automatic transmission for controlling speed change by referring to a shift pattern map on the basis of vehicle speed and engine load to select a speed change step, comprising:
A control apparatus for an automatic transmission for controlling speed change by referring to a shift pattern map on the basis of vehicle speed and engine load to select a speed change step, comprising:
Dependencies are inferred from the claim text.