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Technical details of EVE Hybrid technology demonstrator


Engine
Various changes have been made to the Proton gasoline 1597cc CamPro engine. The main modification is the redesign of the front end accessory drive (FEAD). This was done to accommodate a Valeo 'StARS' starter/alternator, which drives the micro hybrid start-stop system.
The redesigned FEAD also accommodates a Sanden hybrid Heating Ventilation and Air Conditioning (HVAC) compressor that operates by conventional belt drive and has an additional electrically driven capability which enables continued air conditioning operation when the engine is stopped.
During the FEAD redesign the opportunity was also taken to replace the belt driven Power Assisted Steering (PAS) and water pumps with electric units to enable the investigation into the economy benefits of such units. To accommodate the additional hybrid functionalities the Engine Management System (EMS) was updated to a Siemens VDO torque-based unit and re-calibrated by Lotus Engineering.
Motor/Generator
Due to tight packaging constraints and to minimise any loss in overall vehicle performance, bespoke electric motor and power electronics were developed in conjunction with specialist suppliers ElektroMagnetix and Turbopower Systems. The motor/generator and power electronics are water-cooled and include an auxiliary power unit to support the vehicle's 12volt systems.
An additional clutch supplied by AP Racing is packaged inside the motor and connects the IC engine to the traction motor. This enables the engine to be switched off for electric drive only use.

Gearbox
A Punch Continuously Variable Transmission (CVT) has replaced the conventional transmission and a modified bell housing accommodates the electric traction motor.
Battery Pack
The EVE Hybrid uses a Cobasys Series 1000, NiMH, 30kW 144V module that incorporates an integrated cooling system. This traction battery pack is securely mounted on the boot floor, displacing approx 47 litres of luggage space.

Control System
A sophisticated bespoke Lotus Engineering control system was developed to implement the energy management function by monitoring and controlling all sub-control systems including the engine management, motor/generator, transmission, HVAC, additional clutch, starter/alternator and battery pack.

Brake System
To maintain the integrity of the braking circuit when the petrol engine is off, a Mes-Dea electric vacuum pump maintains the vacuum assist for the brakes.

Steering System
An off-the-shelf TRW electro-hydraulic power assisted steering pump has been fitted, which allowed the retention of the existing steering column and hydraulic steering gear. This pump also provides hydraulic pressure for the additional clutch that engages the hybrid motor.
Interior
The instrument panel incorporates an additional LCD display developed by Lotus Engineering to show battery charge, power split between engine and motor, fuel economy and charge/discharge rate, and incorporates associated warning indicators where appropriate. Also fitted to the dash are new switches to select the car's operating mode - micro hybrid, full hybrid or electric vehicle.



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