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At the Geneva Motor Show, Porsche returned to the car and the 919 Hybrid prototype completed its world premiere. It is a hybrid with a 2.0-liter V4 engine and the first model in the LMP1 racing vacancy in 16 years, and will participate in this year's WEC Endurance Championship. Porsche Chairman Matthias Muller commented on the car: “In 2014, even if he was not the fastest model of WEC and Le Mans, it was the most suitable match between energy consumption and speed. This car is Porsche. The most complicated car ever built."
WEC's latest rules based on efficiency have contributed to innovation in hybrid drives. Therefore, the 919 Hybrid can be considered a "white mouse" for future production car technology.
The 919 Hybrid's engine is one of the structural components on the chassis with a maximum speed of approximately 9000 rpm. With a direct fuel injection and a single turbocharged system, this engine with a small displacement can achieve a maximum output of 373 kW (500 hp).
The biggest highlight of the car is the use of two energy recovery systems in the car. The first system recovers thermal energy from the exhaust through a motor driven by engine exhaust; the second system is installed in the front axle motor to recover braking energy and convert it into electrical energy for storage in a liquid-cooled lithium battery pack. .
The V4 petrol engine and turbocharger are integrated into the chassis and are centered. Lithium battery pack in the center of the chassis is used to power the front axle motor
The in-vehicle lithium battery pack is supplied by A123. When the driver needs to use the stored energy, the motor at the front axle will be driven by a differential. Because it is the same as the 918Spyder, it can realize temporary four-wheel drive.
During the design of the 919 Hybrid, engineers focused on power management to achieve the fastest laps while reducing their number of pit stops. Drivers can choose from a variety of driving modes depending on track conditions and weather conditions. 919Hybrid developers have experienced various bad road conditions in the 911GT3 R Hybird during the development process.
The front axle motor distributes torque to the left and right front wheels through the differential
For a racing car, the function of relying on the recovery of braking energy and releasing it at a specific moment is called the Boost function. Generally divided into four levels, the surge energy rate ranges from 2-8 megajoules. The 919 Hybrid achieves a maximum level of 8 megajoules.
Due to the limitations of fuel usage, there is a challenge to how the hybrid system can be used to mix fuel and electrical energy. For example, in Le Mans, a turbocharged petrol engine is only allowed to use 1.23 gallons of fuel at 3/4 of a full load (8.48 miles per lap).
2.0-liter V4 gasoline engine
The minimum designated car weight in a racing race has now dropped from 1,984 pounds to 1,918 pounds. Porsche engineers spare no attention to any details and use the most suitable materials in different locations to take full advantage of the new standards.
The 919 Hybrid's single-body cross-body chassis is made of carbon fiber and has a strong torsional stiffness. The multi-link suspension and 14-inch Michelin wide tires guarantee performance in all conditions.
The car's body size is also strictly controlled, the length of the car can not exceed 183.1 inches, the height can not exceed 41.3 inches, and the width must be between 70.8-74.8 inches. Engineers have been testing the wind tunnel from February 2012 to optimize aerodynamic performance. The cumulative test time has exceeded 2,000 hours. For a car like the 919 Hybrid, aerodynamic performance must take into account factors such as cooling, air resistance, and downforce.
At the Porsche Research and Development Center in Weissach, Germany, a Porsche team of 200 researchers has been set up to further optimize the performance and design of the car.
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