2. A vehicle with the drivetrain with 245/45R19 tires is shown. The reduction ratio between the ring gear and the wheel shaft is 4.113:1. Number of teeth of the ring, sun, and planet gears are 78, 30, and 23, respectively. Assume 1000kg of vehicle mass. a. Suppose the ICE drives the vehicle at constant speed of 60mph with 50kW of power. Assume MG1 and MG2 are rotating at the same speed with ICE. If MG2 is idling without providing any traction power, how much power is MG1 generating? b. Suppose MG2 uses 100% of MG1's generation to accelerate for 10s. Find the speed of the vehicle in mph. INTERNAL COMBUSTION ENGINE BATTERY MG2 INVERTER MG1 INVERTER and Electronics POWER SPLIT DEVICE 100 FRONT WHEELS MOTOR/ GENERATOR REDUCTION GEARS AXLES SILENT CHAIN DIFFERENTIAL MOTORI GENERATOR 2 (MG2) 3. Suppose specification of the planetary gear set in the drivetrain in the previous problem has been modified. Number of teeth of the new sun, planet, and ring gear is 24, 24, and 72, respectively. The reduction ratio between planetary gear shaft and wheel shaft and tires are same. a. If MG2 is used to start and drive the vehicle at 20mph while ICE is locked, find the rotation speed of MG1 in rpm b. While the vehicle is operating at 20mph, how can you increase the ICE speed up to 500rpm? c. Sketch nomograms of 2a and 2b.

Fig: 1