Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Shoji Kan

Yoichi Furuichi

Takahiro Taki

Takeshi Kitagawa

Hiroshi Takuma

Katsutoshi Usuki

Eiji Moriyama

Masakazu Kinoshita

A control device of an automatic transmission of a motor vehicle includes lock-up control means for controlling a coupling state between input and output elements of a torque converter clutch. This control device is used with an engine, which includes an electronic throttle control device that electrically controls a throttle valve, accelerator position detecting means for detecting an accelerator pedal position, a cruise control device that controls an opening of the throttle valve to maintain a vehicle speed at a predetermined vehicle speed, for enabling constant-speed running of the vehicle, and target throttle opening setting means for calculating a pseudo accelerator pedal position, and setting a target throttle opening based on the pseudo accelerator pedal position, when the cruise control device is in operation. The lock-up control means receives information as to whether the cruise control device is in operation or not, controls the coupling state of the torque converter clutch based on the pseudo accelerator pedal position if the cruise control device is in operation, and controls the coupling state based on the accelerator pedal position detected by the accelerator position detecting means if the cruise control device is not in operation.

Controlling lockup clutch and shifts as a function of cruise mode and

Shift control apparatus for automatic transmission for vehicle

Hydraulic pressure supplied to the frictional engaging element of an automotive transmission is corrected to a higher value in the event that the engine is started after a long standstill condition and the first speed ratio is selected, thereby reducing speed-shift shocks when the engine is started from a standstill condition and the first speed ratio is selected.

In an automatic transmission for a vehicle having at least one frictional engaging element and an electromagnetic valve to control hydraulic pressure supplied to the frictional engaging element and achieving a plurality of speed ratios including a predetermined speed ratio achieved by engaging the frictional engaging element, a shift control apparatus includes retardation rate detection means for detecting retardation rate of the vehicle and electromagnetic valve control means for controlling the electromagnetic valve according to the value detected by the retardation rate detection means, and hydraulic pressure supplied to the frictional engaging element is corrected by the electromagnetic valve through electromagnetic valve control means according to the retardation rate of the vehicle detected by the retardation rate detection means, thereby reducing speed-shift shocks during a down-shift in association with retardation of the vehicle.

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Kyoto, Japan

Shoji Kan