Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Transmission control
Patent
1997-12-24
2000-04-25
Zanelli, Michael J.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Transmission control
701 65, 477 97, F16H 6108, B60K 4100
Patent
active
060554754
ABSTRACT:
In a transmission control apparatus and a transmission control method for an automatic transmission, when a detection point is defined in accordance with results of detection by means of a fluid temperature detecting element and a rotational speed detecting element, a plurality of points that surround the detection point are selected among a plurality of preset points. Control values for a control parameter are previously mapped corresponding to the set points, and the control values corresponding to the selected points are read from the resulting map. The controlled variable of the control parameter corresponding to the detection point is appropriately linearly calculated by interpolating the control values. Further, a learning correction value for the control parameter corresponding to the detection point is calculated, and is reflected in the control values for the selected points. Accordingly, even in a situation such that an engine speed and a line pressure are low, as in the case of a shift from the N-range to the D- or R-range, coast-downshift, power-off upshift, etc., the controlled variable of the control parameter can always be adjusted to an appropriate value without regard to dispersion of the hydraulic characteristics attributable to variation in workmanship between individual automatic transmissions or the level of the fluid temperature. Thus, lowering of shift response and shift shock during transmission control can be prevented securely.
REFERENCES:
patent: 5014575 (1991-05-01), Fujiwara et al.
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patent: 5216606 (1993-06-01), Lentz et al.
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patent: 5743826 (1998-04-01), Usuki et al.
patent: 5752210 (1998-05-01), Kato et al.
Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Zanelli Michael J.
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