Method and an apparatus for controlling a car equipped with an automatic transmission having a lockup clutch
August 22, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesFuel 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 InventorsAssigneeApplicationNo. 700774 filed on 08/22/1996US Classes:477/168, With fluid drive477/166, CLUTCH CONTROL477/169Speed responsive controlExaminersPrimary: Marmor, Charles A.Assistant: Jensen, Nathan O. Attorney, Agent or FirmForeign Patent References
International ClassB60K 041/02Foreign Application Priority Data1992-03-02 JPAbstractThe 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. | |
