Target volume based torque phase control during upshift

Details Target volume based torque phase control during upshift Target volume based torque phase control during upshift

2007-11-06

2007-11-06

Jeanglaude, Gertrude A. (Department: 3661)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

Transmission control

C701S052000, C701S104000, C477S121000, C477S150000, C477S154000, C475S073000

Reexamination Certificate

active

11222066

ABSTRACT:
A transmission control system includes a first gear engagement element that receives fluid and engages a first gear. An electromagnetic actuator selectively interrupts fluid flow to the first gear engagement element based on a duty cycle of a control signal. A control module adjusts the duty cycle so that a fluid flow rate continuously decreases as the first gear engagement element produces a first torque sufficient to hold the first gear. The flow rate is based on a first estimated volume of the fluid necessary for the first gear engagement element to produce the first torque. The control module computes a current volume of the fluid when the first gear engagement element produces the first torque. The control module adjusts a value of the first estimated volume for subsequent transmission control when a difference between the current volume and the first estimated volume is greater than a predetermined volume.

REFERENCES:
patent: 4887491 (1989-12-01), Holbrook et al.
patent: 4969098 (1990-11-01), Leising et al.

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