Toyota iQ EV
Toyota's engineers have been involved in Electric Vehicle (EV) research and development for over 40 years, since 1971. Developed in parallel with the company’s pioneering full Hybrid (HV), Plug-in Hybrid (PHEV) and Fuel Cell (FCV) vehicles, the EV represents Toyota’s long-term vision for short range sustainable mobility.
The company’s readily adaptable Hybrid Synergy Drive® platform serves as the core technology for all of its advanced powertrain applications, based on specific usage patterns: EV for city driving, PHEV for city/mid distance use, HV for mid distance driving and FCV for long distance use.
Key to EV development are the battery and motor control systems that Toyota has created and fine-tuned through the broad technological base of its hybrid vehicle programme. To date, Toyota has developed several types of EV, including a two-passenger concept- the e-com, an SUV- the RAV4 EV, and several FT-EV concept cars.
The iQ EV has been specifically designed as a city commuting vehicle for use in an urban environment.
In the interests of weight saving, packaging and charging times, that range had to be realized with the lowest practical battery capacity. Power efficiency therefore became the key development goal, focusing on a combination of lightweight design and the lowest possible power consumption.
In an EV, the power consumption of the air conditioning system takes up a very high percentage of the total available battery power. To counteract this, the iQ EV features a low power consumption heat pump air conditioning system, allied to seat heater fitted as standard to directly warm occupants, and a new Heated Windscreen Defroster (HWD) system to clear the screen without the aid of the air conditioning system
A lower battery capacity also translates into a shorter charging time. Not only can the iQ EV be fully recharged in approximately three hours, but also, via Fast Charging, its battery can be recharged up to 80% capacity in only 15 minutes, significantly enhancing the convenience and practicality of the new Toyota EV.
The iQ EV features numerous aerodynamic enhancements in the interests of maximizing power efficiency. Grille openings have been reduced to a minimum and the bonnet upper surface shaped to optimise airflow over the front of the vehicle. The A pillar moulding width has been increased, the roof rear edge angled, and the rear pillar, quarter window glass and moulding shaped to help air flow separation over the top and sides of the vehicle.
The front fender wheel opening has been aerodynamically shaped, front and rear wheel spats added in three locations and even the iQ EV-unique aluminium wheel cap design itself has been aerodynamically styled to optimise the flow of air down the sides of the vehicle, minimizing turbulence. Comprehensive underbody covers allied to the underside of the battery pack create a flat underfloor surface, further enhancing the aerodynamic efficiency of the new Toyota.
The new Toyota iQ EV combines compact city car agility with zero emissions and the easy, silent driving style of a fully electric vehicle.
Its small, 4.1 metre turning circle gives it excellent manoeuvrability in the urban environment, and the position of the battery pack beneath the vehicle floor creates a low centre of gravity and ideal front/rear weight distribution for excellent ride comfort and agile, engaging handling.
A further development of Toyota’s Hybrid Synergy Drive® technology, the iQ EV’s fully electric powertrain comprises an air-cooled, 47 kW electric motor/generator, a 150 cell, a 12.0 kWh, 277.5 V battery pack, a 3 kW water-cooled battery charger, an inverter, an DC/DC converter and a motor speed reduction mechanism.
The motor/generator, planetary gear speed reduction mechanism and torque biasing differential are all housed in a new, ultra-compact, EV-exclusive transaxle, which combines a low centre of gravity with reduced energy losses to minimise power consumption.
Maximum torque of 163 Nm is delivered, from a standstill, to the front wheels, giving the iQ EV 0-100 km/h acceleration of 14.0 seconds and a maximum speed of 125 km/h.
The new Toyota EV generates zero CO2, NOx or particulate emissions throughout its operation. With a power consumption of 134 Wh/km, this equips the vehicle with an NEDC-certified range of 85 km between charges.
Source: Toyota press