Lockup control system for automatic transmission

Details Lockup control system for automatic transmission Lockup control system for automatic transmission

1987-03-06

1989-04-25

Lall, Parshotam S.

Boots, shoes, and leggings

74866, 192 0092, 192 331, G06F 1520, B60K 4122

Patent

active

048253669

ABSTRACT:
A lockup control system for a torque converter with a directly coupled clutch is disclosed. A gear ratio of the torque converter is detected as is a throttle valve opening. A gear ratio data (as a reference data) which is previously assigned to a throttle valve opening is read from ROM, and is compared against the detected gear ratio. If the latter is equal to or greater than the former, a lockup command is provided, and a prevailing vehicle speed is written into a register. When a lockup condition is established, the current vehicle speed is compared against the vehicle speed stored in the register, and whenever the former becomes equal to or less than the latter from which .DELTA.V is subtracted, the lockup is terminated. Reference data is provided in three groups corresponding to three temperature regions of the torque converter. A group corresponding to the actual temperature of the torque converter is selected, and reference data in the group which corresponds to a particular throttle opening is read from ROM. .DELTA.V is a function of the throttle opening, and assumes a smaller value for an increased throttle opening and assumes a greater value for a reduced throttle opening.

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