초록 ▼

An electronically or hydraulically controlled automatic transmission system comprises three means for detecting the release of an accelerator pedal, for detecting the depression of a brake pedal and for detecting an excess of acceleration over a predetermined amount, and only in response to the simu

An electronically or hydraulically controlled automatic transmission system comprises three means for detecting the release of an accelerator pedal, for detecting the depression of a brake pedal and for detecting an excess of acceleration over a predetermined amount, and only in response to the simultaneous detections in all of those means, which are caused in running down a slope, an automatic engine braking can be effected by the electronically controlled down-shift of the speed range of the vehicle, and further on account of an appropriate delay of the detection of the released accelerator pedal, an unnecessary engine braking can be prevented in the ordinary running which is accompanied by frequent slight variations in acceleration on a flat road or a gradual up or down slope.

대표청구항 ▼

An automatic transmission system, wherein a plurality of vehicle speed ranges are set up selectively by controlling a plurality of shift solenoids for shifting mutually the vehicle speed ranges, comprising: an idling detection means for detecting the release of an accelerator pedal, a brake action d

An automatic transmission system, wherein a plurality of vehicle speed ranges are set up selectively by controlling a plurality of shift solenoids for shifting mutually the vehicle speed ranges, comprising: an idling detection means for detecting the release of an accelerator pedal, a brake action detecting means for detecting the stepping of a brake pedal, an acceleration discriminating means for detecting the acceleration which exceeds a predetermined amount thereof, and a control means for controlling said plurality of shift solenoids only when detection output signals are derived from all of said idling detection means, said brake action detecting means and said acceleration discriminating means, so as to effect automatically the down shift of the vehicle speed range for attaining the function of engine braking.