In a driving force control apparatus for an automotive vehicle employing
an engine that drives a main drive wheel, a generator driven by the
engine, and a motor driven by an electric power output generated by the
generator to drive a subsidiary drive wheel, a subsidiary-drive-wheel
acceleration slip estimation circuitry is provided to estimate a
subsidiary-drive-wheel acceleration slip rate. An electric power output
suppression circuitry is provided to suppress the electric power output
of the generator when the estimated subsidiary-drive-wheel acceleration
slip rate exceeds a predetermined slip rate. Also provided is a
subsidiary-drive-wheel acceleration-slip period engine output torque
reduction circuitry that reduces an engine output torque responsively to
suppressing the electric power output.