192 clutches and power-stop control – Vortex-flow drive and clutch – With brake
Patent
1990-03-29
1991-09-24
Bonck, Rodney H.
192 clutches and power-stop control
Vortex-flow drive and clutch
With brake
192 0076, 192 331, 192 82T, F16H 4502, B60K 4128
Patent
active
050507176
ABSTRACT:
A lock-up control in a motor vehicle includes a lock-up control solenoid for engaging a lock-up clutch in a torque converter. A hydraulic fluid temperature of hydraulic fluid used in the torque converter and also in the associated automatic transmission is detected. When the fluid temperature becomes higher than a predetermined temperature value, for example 120.degree. C. in the embodiment, a different lock-up shift point mapping is set which defines a lock-up range stretching beyond a predetermined gear position to include a gear position lower than the predetermined gear position. Thus, the lock-up range where the lock-up clutch should be engaged stretches, rendering the torque converter to stop stirring the hydraulic fluid therein when the fluid temperature is higher than the predetermined temperature value, effectively preventing further rise in the fluid temperature.
REFERENCES:
patent: 4449618 (1984-05-01), Suga et al.
patent: 4680992 (1987-07-01), Hayasaki et al.
patent: 4687083 (1987-08-01), Sotoyama et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4817473 (1989-04-01), Baltusis et al.
patent: 4825366 (1989-04-01), Yamamoto et al.
Bonck Rodney H.
Nissan Motor Co,. Ltd.
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