Driving force control device of vehicle

摘要

A powertrain manager executes a program including the steps of: reading an instruction gear ratio kgear(1) for transmission control; calculating an actual gear ratio kgear(2); determining that failure of an automatic transmission has occurred on a low gear side if relation of kgear(1)<{kgear(2)/α} or kgear(1)<{kgear(2)−&bgr;} is satisfied; and substituting larger one of kgear(1) and kgear(2) into a gear ratio for operation.