Fuel cut-off system for an engine coupled to an automatic power transmission with a lockup device
Microprocessor controlled system and method for reducing the fuel flow to the prime mover of a power delivery system having a continuously variable ratio transmission upon a commanded decrease in power delivery
System for controlling a lock-up system of an automatic transmission for a motor vehicle
Method and appartaus for controlling driving power of motor vehicle
Electronically controlled automatic transmission
Air-fuel ratio control system for internal combustion engines with torque converter lock-up Patent #: 5385517
ApplicationNo. 700774 filed on 08/22/1996
US Classes:477/168, With fluid drive477/166, CLUTCH CONTROL477/169Speed responsive control
ExaminersPrimary: Marmor, Charles A.
Assistant: Jensen, Nathan O.
Attorney, Agent or Firm
Foreign Patent References
International ClassB60K 041/02
Foreign Application Priority Data1992-03-02 JP
AbstractThe 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.