Shift control system with an automatic first sequence and a manual second sequence of gear stages

A shift control system for a vehicular automatic transmission including a gear train to be set to a plurality of gear stages in accordance with engaged or released states of a plurality of friction devices, comprising:

• mode selection means for selecting an automatic shift mode to effect a shift according to a first sequence of gear stages, which is composed of a plurality of gear stages selected from those capable of being set with said gear train, or a manual shift mode to effect a shift according to a second sequence of gear stages, which is composed of other plural gear stages selected from those capable of being set with said gear train;
• automatic shift control means for outputting a shift signal in accordance with a running state of a vehicle to set any of the gear stages of said first sequence of gear stages when said automatic shift mode is selected;
• gear stage selection means for outputting an upshift signal and a downshift signal in response to operations of manual upshift and downshift, respectively, when said manual shift mode is selected;
• manual shift control means responding to the upshift signal and downshift signal outputted from said gear stage selection means, for outputting a shift signal to select and set a gear stage from said second sequence of gear stages;
• and
• hydraulic control means for feeding/draining an oil pressure to said friction devices to set the gear stage which is commanded by the shift signals outputted from said automatic shift output means and said manual shift output means,
• wherein absolute values of differences between gear ratios of adjoining gear stages of said first sequence of gear stages are smaller than those of said second sequence of gear stages.