|The C9. Click to enlarge.|
BYD Motors Inc. unveiled the first long range, 100% battery-electric over-the-road coach bus (as opposed to a city transit bus) at the United Motorcoach Association Expo in New Orleans. This first electric coach—the BYD C9—is a two-axle, 40' coach with the seating capacity to carry 47 people at highway speed for more than 190 miles.
The BYD C9 is the first of three battery-electric coaches the company will launch globally this year. The other two, a 45' three-axle coach named the C10 and a 23' coach with executive and transport configurations named the C6 will be arriving by the end of 2015. BYD is taking orders for all three of the coaches starting now.
The C9 uses BYD’s in-wheel drive axle with two 180 kW brushless AC synchronous motors (BYD-TYC180A), each of which develops 1,500 N·m (1,106 lb-ft) of torque. The 365 kWh Li-ion iron phosphate battery pack can accept 200 kW charging for a charging time of less than two hours. Top speed of the bus is 62.5 mph (101 km/h).
BYD projects the battery capacity will remain above 80% after 12 years of use. The BYD Intelligent Battery Management System (iBMS) assists with balancing and charging safety.
The C10 supports up to 58 seats, and also has a range of more than 190 miles. The drive axle is the same BYD in-wheel drive rear axle with 180 kW machines, but the battery pack is slightly larger: 394.2 kWh. Using a triple charging scheme (300 kW from 100 kW x 3 at 480 VAC), the C10 can recharge in 1.3 hours.
The C6 supports up to 21 seats, has a top speed of 77.7 mph (125 km/h) and has a range of more than 124 miles (200 km). It uses a single longitudinally mounted 180 kW electric machine, powered by a 152 kWh battery pack. With 100 kW charging, recharging time is from 1.5 to 2 hours.