Motor vehicle drive system controller and automatic drive controller

A motor vehicle drive system controller for automatic drive control for controlling the power output of the engine and the gears of the automatic transmission to control the motor vehicle running speed according to a set of given parameters, wherein the drive system controller comprises:

• a drive status map memory for storing a drive status map correlating to the motor vehicle running speed, the throttle position, and the drive status;
• a drive status determining section for determining whether or not the current drive status is in a consistent drivable mode immediately before a downward gear shifting operation under automatic drive control on the basis of the detected running speed and the detected throttle position, referring to the drive status map;
• and
• a throttle control section for controlling the throttle position so as to maintain the consistent drivable mode during the gear shifting operation when the drive status is found to be in the consistent drivable mode immediately before the downward gear shifting operation,
• wherein said consistent drivable mode refers to a state where the motor drives the motor vehicle and excludes an ambiguous zone between a drivable mode and an undrivable mode.