Toyota revealed new details and specs of the Yaris Hybrid-R Concept that will be unveiled in September at the 2013 Frankfurt Motor Show (IAA). What we do know now is that the new concept car is combines the power of a 1.6-liter petrol Global Race Engine with two electric motors, in order to provide an ‘intelligent’ electric four-wheel drive capability.
The 4-cylinder 1.6-liter turbo engine delivers 300 hp to the front wheels, while at the rear, each wheel is individually powered by a 60 hp electric motors. As a result, the total output delivered by the Yaris Hybrid-R Concept is 420 hp. Just like the TS030 Hybrid race car, the two electric motors act as electric generators during braking phase and can supplement the petrol engine during accelerating.
Energy is stored in a super capacitor that has a higher power density and a fast power charge/discharge speed, when comparing it with a standard NiMh hybrid battery. The super capacitor releases the energy that is recovered under braking for a maximum duration of 10 seconds per charge and the total power of the two electric motors is reduced to 40 hp. Still, in track mode the rear electric motors reach a combined power of 120 hp for up to 5 seconds per charge.
What’s more interesting is that a 3rd 60 hp electric motor is located between the engine and the 6-speed sequential transmission and operates as a generator during the deceleration to feed the super capacitor or during acceleration to directly power the rear electric motors.
The rear electric motors can also influence the handling of the Yaris Hybrid-R Concept by altering the distribution of the torque between the left and rear wheels. The system can send more torque to the outside rear wheel for example and allows higher cornering speeds. [source: Toyota]