from the planetary ring gear to the countershaft gears 30 32 34 and power output from the transmission drives the wheels generator 50 when acting as a motor can deliver power to the planetary gearing when acting as a generator generator 50 is driven by the planetary gearing similarly power distribution between the motor 46 and the countershaft gears 30 32 34 can be distributed in either direction as shown in fig1 and 2 engine power output can be split into two paths by controlling generator 50 in operation the system determines the driver 39 s demand for torque and achieves the optimum split of power between the two power sources in accordance with the invention which is applicable to any advanced vsc to avoid engine speed flare up at wide open throttle when the a c compressor clutch engages or when any other change to available engine brake power not associated with a driver input occurs driver demanded wheel power is reduced subject to certain exceptions fig3 a 3 b and 3 c illustrate exemplary system behavior in accordance with the invention fig3 a at 60 shows the a c compressor clutch engaging and then subsequently disengaging fig3 b at 62 shows the engine speed staying constant while fig3 c at 64 shows the wheel power being reduced in this way a reduction in demanded wheel power by the power consumed by the a c compressor keeps the total power demand from increasing so that.