Internal-combustion engines – Engine speed regulator – Open loop condition responsive
Patent
1999-01-25
2000-08-01
Yuen, Henry C.
Internal-combustion engines
Engine speed regulator
Open loop condition responsive
123361, F02D 4100
Patent
active
060951176
ABSTRACT:
The present invention relates to a method and an apparatus for controlling a car equipped with an automatic transmission having a lockup clutch. According to the control method of the present invention, when the lockup clutch is in the lockup state, a variation of a generated torque is detected. When the range of the torque variation detected exceeds a predetermined value, an engine torque is reduced by controlling the engine, and the automatic transmission is controlled to compensate for a reduction of the driving torque due to a reduction of the engine torque. Thus, the speed change ratio is changed to the low gear side. The control unit of the present invention includes a unit for controlling an output torque of an engine according to a command value, a unit for changing the transmission ratio of the automatic transmission, a unit for detecting a variation of the engine torque, a unit for deciding a target driving torque, a unit for reducing a torque command value when the range of a detected variation of the torque has exceeded a predetermined value when the lockup clutch was in the lockup state, and a unit for deciding a transmission ratio at which the reduction of the driving torque due to the reduction of the engine torque is compensated for.
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Ibamoto Masahiko
Kawashima Ken'ichi
Kuroiwa Hiroshi
Minowa Toshimichi
Nishimura Yutaka
Gimie Mahmoud M.
Hitachi , Ltd.
Yuen Henry C.
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