초록 ▼

The lock-up control system functions to temporally release lock-up operation of a torque converter of the transmission upon occurrence of a gear shift signal even if the automotive vehicle is operating within lock-up range. A plurality of gear shifting detectors are provided, each generating a gear

The lock-up control system functions to temporally release lock-up operation of a torque converter of the transmission upon occurrence of a gear shift signal even if the automotive vehicle is operating within lock-up range. A plurality of gear shifting detectors are provided, each generating a gear shift signal when triggered. Gate means function to select one of said plurality of gear shifting detectors in response to engine load for allowing transmission of a gear shifting command to a selected gear shifting detector. Delay means are provided to retard transmission of the gear shifting command to the plurality of gear shifting detectors in such a manner that a delay between the occurrence of the gear shifting command and the occurrence of the gear shift signal increases as the engine load decreases.

대표청구항 ▼

A lock-up control system for a lock-up type automatic transmission of an automotive vehicle having an engine, said transmission including a hydraulic control system for operating a plurality of hydraulic devices operable to be selectively actuated to establish one of a plurality of gear ratios, and

A lock-up control system for a lock-up type automatic transmission of an automotive vehicle having an engine, said transmission including a hydraulic control system for operating a plurality of hydraulic devices operable to be selectively actuated to establish one of a plurality of gear ratios, and a torque converter with a lock-up clutch, the torque converter being shiftable into a lock-up state wherein said lock-up clutch is engaged or a torque converter state wherein said lock-up clutch is released, the lock-up control system comprising: means for detecting the speed of said vehicle and for generating a vehicle speed signal; means for comparing said vehicle speed signal with a reference value and for generating a comparison signal; means responsive to said comparison signal for determining when said automotive vehicle is operating in a predetermined lock-up range and for generating a lock-up permission signal when the automotive vehicle is operating in a predetermined lock-up range; means for detecting a command for shifting between gear ratios and for generating a shift command indicative signal; means responsive to said shift command indicative signal for generating a gear shift signal; means for determining a load on said engine and for generating an engine load indicative signal; means, responsive to said engine load indicative signal for delaying said shift command indicative signal by a period of time which varies according to said engine load; and means, responsive to said lock-up permission signal and said gear shift signal for engaging the lock-up clutch when said lock-up permission signal is present and said gear shift signal is absent and for releasing said lock-up clutch when the gear shift signal is present regardless of the generating of the lock-up permission signal.