Title:
LOCKUP-TYPE AUTOMATIC TRANSMISSION
Document Type and Number:
Japanese Patent JPS56167950
Kind Code:
A
Abstract:
PURPOSE:To improve the feeling of ride, by changing a reference vehicle speed, which is used as a reference for lockup signal output, in a hysteretic manner depending on running load determined from the deviation of actual acceleration from a set level, to reduce the frequency of change-over between a locked-up state and a converter operation state. CONSTITUTION:Speed change position signals S1-S3, a vehicle speed signal V and a throttle signal TH are applied to a set acceleration memory circuit 222 of a load detection circuit 220. Set acceleration alpha' is read. Actual acceleration alpha is calculated from a vehicle speed V determined in a differentiation circuit 223. It is judged through hysteresis set circuits 238-240 and a comparator 224 whether the actual acceleration is higher or lower than the set acceleration. The result of the judgement is applied to a vehicle speed comparison circuit 221 and a low or high speed vehicle speed circuit to change a reference vehicle speed. A lockup signal corresponding to load is supplied from the vehicle speed comparison circuit 221. The frequency of change-over between a locked-up state and a torque converter operation state is thus reduced to improve the feeling of ride.
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Inventors:
FUTAKI MASAAKI
SUGA MASAAKI
HAMADA HIDEO
SUZUKI SUNAO
MORIMOTO YOSHIROU
SUGA MASAAKI
HAMADA HIDEO
SUZUKI SUNAO
MORIMOTO YOSHIROU
Application Number:
JP6894880A
Publication Date:
December 23, 1981
Filing Date:
May 26, 1980
Export Citation:
Assignee:
NISSAN MOTOR
International Classes:
F16H61/14; (IPC1-7): F16H45/02