Lock-up clutch control method in automatic transmissions for aut

Details Lock-up clutch control method in automatic transmissions for aut Lock-up clutch control method in automatic transmissions for aut

1987-07-14

1989-03-14

Scherbel, David A.

192 clutches and power-stop control

Vortex-flow drive and clutch

With brake

192 0092, B60K 4102

Patent

active

048118273

ABSTRACT:
A lock-up clutch of an automatic transmission is controlled by an electronic control unit using a gear shift diagram and a lock-up clutch changeover diagram each having vehicle velocity plotted along identical abscissa and throttle opening plotted along identical ordinate. Changeover of the lock-up clutch is controlled upon setting a changeover line in the changeover diagram in accordance with which the lock-up clutch is changed over from OFF to ON state, and changeover of transmission gear ranges is controlled upon setting a transmission gear range changeover point in the gear shift diagram. The changeover line is set in such a manner that it will not intersect a region in the gear shift diagram where the shift position is 2nd gear range or less and the throttle opening is less than a predetermined value. Thus, the lock-up clutch is not engaged in a case where the transmission is in 2nd gear range or less and, moreover, the throttle opening is less than a predetermined value.

REFERENCES:
patent: 4516671 (1985-05-01), Nishikawa et al.
patent: 4548307 (1985-10-01), Nishikawa et al.
patent: 4570770 (1986-02-01), Nishikawa et al.
patent: 4597482 (1986-07-01), Sakurai et al.
patent: 4618037 (1986-10-01), Nishikawa et al.
patent: 4640394 (1987-02-01), Higashi et al.
patent: 4658943 (1987-04-01), Nishikawa et al.

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