Mitsubishi PX-MiEV II Concept
MITSUBISHI CONCEPT PX-MiEV
MITSUBISHI CONCEPT PX-MiEV
Solid, Safe, and Simple were the keywords which drove the development of an exterior design suitable for a next-generation crossover that creates simple appearance from which all extraneous elements have been pared and that is free of the "rugged" elements typical in conventional SUVs. The headlamps and rear combination lamps use LED emitters that give the car an innovative and modern appearance as well as delivering better environmental performance with their reduced power consumption. The body uses a newly-developed metal colour that gives the car a metal shell-like appearance. Combining elements of both spoke and dish styling, the road wheel design highlights an unprecedented new look to the body as well improving brake cooling and aerodynamic performance.
The interior was designed to give an image of an airplane cockpit to improve the driver's concentration, with an instrument panel that envelops the passengers and utilises seats that keep the passengers firmly in place. In addition, the entire instrument panel and door trim utilise soft LED lighting that express the vehicle's innovation and refinement.
2. Mitsubishi Plug-in Hybrid System
The Mitsubishi Concept PX-MiEV's front and rear wheels are powered by two permanent magnet synchronous motors and is also fitted with a 1.6L DOHC MIVEC gasoline engine which can power the front wheels as well as work as a generator. In addition, the vehicle comes with the newly-developed Mitsubishi Plug-in Hybrid System in which electronic circuitry automatically switches to the optimum drive mode for different driving conditions and remaining energy in the drive battery to extract maximum efficiency from the electric motors and from the gasoline engine. The Mitsubishi Concept PX-MiEV also utilises the MiEV OS (MiEV Operating System) which selects the optimum drive mode through integrated control of the EV components and the gasoline engine as well as controls optimum electrical charge and output in response to remaining battery energy through constant monitoring of the drive battery. With these, a pleasing, safe, and comfortable ride is achieved while conserving energy. In addition, to maximise effective use of the drive battery, the vehicle is equipped with a power supply mode that allows the use of some battery power to supply domestic appliances or as an emergency power source in the event of a natural disaster.
At low to middle vehicle speeds the Mitsubishi Concept PX-MiEV's drive battery powers the front motor using front-wheel drive. When driving on snow, in the rain or in other low surface friction situations where maximum vehicle stability is required, the system automatically switches to four-wheel drive mode by feeding power to the rear wheel motor as well when sensors detect any front wheel slip.
Series hybrid mode
When the remaining energy in the drive battery falls to a predetermined level the system starts the gasoline engine to generate electricity and automatically switches to the series hybrid mode using the electricity generated to power the motors. In this mode as well, the system switches to four-wheel drive by driving the rear motor depending on driving conditions.
Parallel hybrid mode
At higher vehicle speeds the car is supported by the gasoline engine which operates more efficiently than the electric motors at high revolutions. In this mode, the gasoline engine also helps drive the wheels. When the driver makes sudden lane changes or other manoeuvres requiring greater vehicle stability the system switches to four-wheel drive by bringing in the rear motor to drive the rear wheels, improving stability. In addition when overtaking at higher speeds or in other situations requiring faster acceleration the system switches in both front and rear motors to provide additional power and assist the gasoline engine, providing high acceleration.
When the vehicle is slowing or coasting down a long descending slope the system switches to regenerative mode in which kinetic energy reclaimed from the wheels is stored in the drive battery.
As with the production i-MiEV, Mitsubishi Concept PX-MiEV features a 3-way battery charging system using either a 100-volt or a 200-volt domestic supply or a high-power quick-charging station. The system also incorporates a Wireless Charging Program feature that allows the owner to start charging the battery or start the air conditioner at a preset time even when away from the vehicle.
Power supply mode
As a way to maximise the usefulness of the power stored in the drive battery based on the "Smart Grid Framework," which garners attention as a link in tackling global warming, when not on the road the Mitsubishi Concept PX-MiEV allows the owner to store electricity at night and then use that electricity via the normal charging connector to power home appliances during the daytime when domestic electricity consumption is highest. This allows the drive battery to be used as a power source in the event of a natural disaster. Should the electricity left in the battery fall below a predetermined level, the gasoline engine starts up and works as generator to maintain the power supply at a fixed level.
A 100-volt AC auxiliary socket in the rear luggage compartment also allows the electricity stored in the drive battery to be used to power cooking or lighting equipment and other appliances when camping or engaged in other leisure activities.
3. Drive system
Mitsubishi Concept PX-MiEV uses Mitsubishi's S-AWC integrated vehicle handling control system which is configured around an E-4WD (Electronically-powered four-wheel drive) system that controls front and rear motor output to deliver the optimum front/rear drive torque split. Under the integrated control of the S-AWC system are E-AYC (Electric-powered Active Yaw Control), which controls left/right torque split at the rear wheels and the degree of deceleration energy recovery, ASC (Active Stability Control) and ABS (Anti-lock Brake System) components.
Unlike the AYC system on the Lancer Evolution X which uses a wet multi-plate clutch arrangement, E-AYC uses a differential motor to control rear wheel torque split. The use of the differential motor makes for a high-efficiency system with outstanding response and contributes to the on-demand handling and outstanding vehicle stability that characterises the S-AWC system.