Speed change controller for a vehicle automatic transmission

A speed change controller for a vehicle automatic transmission, and controller comprising;

• an automatic transmission provided on the output side of an internal combustion engine of the vehicle,
• a vehicle speed sensing means for sensing vehicle speed,
• a throttle valve opening sensing means for sensing the opening of a throttle valve in an air intake system of the engine,
• a driving conditions cognition means for cognition/judgment of vehicle driving conditions.
• a speed change range storage means for pre-storing, on the basis of vehicle driving conditions, speed change ranges contained in a plurality of speed change steps and classified into a number of partitions ranging from a first speed change range for traveling speeds of n or n+1, to a k+1 speed change range for traveling speeds of n+k or n+k+1,
• a speed change range selection means for selecting from said speed change range storage means, a single speed change range out of the speed change ranges from said first speed change range to said k+1 speed change range, on the basis of vehicle speed and throttle valve opening sensed by said vehicle speed sensing means and said throttle valve opening sensing means respectively,
• a speed change step selection means for selecting from said selected speed change range, a speed change position for either a low speed change step or a high speed change step, on the basis of vehicle driving conditions recognized by said driving conditions cognition means, and
• a shift change means for changing the shift step of said automatic transmission according to said selected speed change position.