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Hyundai Motor Co., Ltd. released a technical overview of the new car "IONIQ" on January 7, 2016.
IONIQ has three drive systems: pure electric vehicle (EV), plug-in hybrid vehicle (PHEV) and hybrid vehicle (HEV). This is a summary of the high-efficiency drive systems, lightweight measures, and environmentally friendly drive systems used in the HEV version.
Engine thermal efficiency reaches 40%
The hybrid system uses a combination of high-efficiency engines, high-efficiency motors, safety-enhanced high-efficiency secondary batteries, and specially developed DCT (Dual Clutch Transmission) four new technologies.
The 1.6-liter displacement “Kappa GDi†engine specially developed for hybrid vehicles employs a direct injection system with high-pressure fuel injection at 20 MPa, an Atkinson circulation system, high-capacity EGR (exhaust gas recirculation), and cylinder heads and cylinders. Separate body cooling methods.
By using the above techniques to minimize losses, this engine achieves 40% thermal efficiency. The maximum output power of the engine is 77kW and the maximum torque is 147N·m. A permanent magnet motor with a maximum output of 32 kW and a maximum torque of 170 N·m is used in combination.
In addition, a dedicated 6-speed DCT suitable for this combination of engine and motor has also been developed to optimize the hybrid drive distribution.
Lithium-ion battery with improved safety
Lithium-ion polymer secondary batteries optimize charge and discharge characteristics for motors driven at high voltages. In addition, in order to improve security, the coordinated control between controllers has been enhanced. If a high-voltage component fails, the fail-safe function is activated.
In addition, the voltage, current, and temperature are monitored in real time, and if there is a danger of overcharging, the current will be cut off. In order to enhance the heat dissipation function, the battery unit uses a high-strength separator.
Reduce body weight and improve fuel efficiency
In order to reduce fuel consumption, we also tried to reduce the body weight. Through the use of ultra-high-tensile steels and aluminum alloys in large quantities, rigidity is achieved while achieving light weight.
The hood, tailgate, front and rear bumper back beams, and front and rear suspension parts are made of aluminum alloy. Compared to the original steel, the weight of the hood is reduced by 6.5kg and the tailgate is reduced by 6.1kg. The use rate of ultra-high tensile steel is over 53%. The use of aluminum alloy structural parts optimizes the energy absorption during collisions.
In addition, structural adhesives have been used to improve joint strength in a total of 145m joints.
Predicting road conditions improves fuel efficiency
The Eco-Driving Assistant System (ECO-DAS) is linked to a navigation device equipped with a high-precision map. It is possible to read the situation in front of the road and increase the coasting distance to reduce fuel consumption.
For example, in the case of a turn around the intersection and a main line exiting the freeway, the driver is reminded to release the accelerator pedal in advance if deceleration in front is predicted. This minimizes the use of brakes and avoids unnecessary fuel consumption.
In addition, a mechanism for predictive management of battery charge and discharge using high-precision maps has also been developed. For example, charge the battery as much as possible before going uphill, and discharge it when uphill to increase the amount of motor assistance. The motor drive is actively used before the downhill slope, and regenerative braking is used to charge the downhill slope. (Reporter: Shibuya Shajiangzi)
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