On www.911-magazine.porsche.com, three successive episodes will give viewers a comprehensive insight into the new cars’ special technical features, historical backgrounds and design. In response to the global ban on events due to the coronavirus, the sports car manufacturer will thereby be presenting its new models to journalists and fans in virtual format for the first time.
Using engineering expertise from its motorsport team, Honda is drawing knowledge from its Formula 1™ Hybrid Power Unit (PU) programme to improve the energy efficiency of the brand's e:HEV hybrid system.
The latest Honda Formula 1 Hybrid Power Unit, named RA620H, uses a highly efficient 1600cc six-cylinder internal combustion engine, combined with an Energy Recovery System. The advanced hybrid electrical systems ingeniously recycle energy produced by the brakes and exhaust gases to generate extra boost power for acceleration and to reduce turbo lag. Last season, Honda’s Hybrid Power Unit helped its partner teams, Aston Martin Red Bull Racing and Scuderia Toro Rosso (now known as Scuderia AlphaTauri), achieve a total of three race wins and six podium places.
During races, Honda Formula 1 engineers are constantly assessing and changing the ratio of energy recovered and deployed by the hybrid system to deliver optimum performance. The expertise they have developed in running hybrid power units at optimum efficiency and power output inspires Honda's range of advanced e:HEV powertrains in its passenger cars.
The latest road-going beneficiary of this technology is the all-new Jazz. Its e:HEV hybrid system recycles energy and harnesses it to charge the battery and support engine output, for strong performance, seamless switching between drive modes and maximum efficiency.
Yasuaki Asaki, Head of PU Development explains: "During a Formula 1 race weekend teams have to manage very carefully how much fuel they use to comply with the sport’s regulations. In a race we can divide the total fuel allowance over the number of laps, but there are going to be situations where a team might wish to use more fuel in order to get higher performance and in other parts of the race they will want to save fuel for later, while behind a safety car for example. In a race, the communication between the race engineer and the driver is key to achieving that best balance. However, in our road-going e:HEV hybrids we apply our expertise to ensure the Powertrain control units deliver the best possible power to efficiency ratio for the driver, in any required driving mode."
The e:HEV system is newly developed for Jazz and engineered to deliver optimum fuel efficiency and an enjoyable driving experience. It consists of two compact, powerful electric motors connected to a 1.5-litre DOHC i-VTEC petrol engine, a lithium-ion battery and an innovative fixed-gear transmission via an intelligent power control unit, which all work harmoniously together to provide a smooth and direct response.
To deliver such a highly-rewarding driving experience and exceptional efficiency, the advanced e:HEV hybrid set-up seamlessly selects from three interchangeable drive modes:
In most urban driving situations, optimum efficiency is achieved through seamless transitions between EV Drive and Hybrid Drive. For driving at highway speeds, Engine Drive is used, supplemented by an on-demand peak power ‘boost’ from the electric propulsion motor for fast acceleration. In Hybrid Drive, excess power from the petrol engine can also be diverted to recharge the battery via the generator motor. EV Drive is also engaged when the car is decelerating, harvesting energy through regenerative braking to recharge the battery.
Rather than using a conventional transmission, Jazz is equipped with a newly-developed Electronically Controlled Continuously Variable Transmission (eCVT) with a single fixed-gear ratio to create a direct connection between moving components. The result is a smooth and reassuring transfer of torque with a linear feel during acceleration across all drive modes.
Honda's racing heritage dates back to 1958 and in 1965 the brand saw its first Formula 1 win. Throughout its participation in Formula 1, Honda has won a total of 74 Grands Prix and six constructors titles. This participation in the highest level of motorsport has enabled Honda to maintain its highly advanced engineering capabilities and apply its on-track expertise to the road.
Unlike internal combustion engine vehicles that have holes in the front grill to let the air flow in, the front of an electric vehicle is completely blocked. Based on this fact, Hyundai Mobis creatively changed the way we think and used the cover itself as a component of the speakers, and developed a new system as a result.
“Hyundai Mobis succeeded in reducing the weight by 2/3 and the size by half,” said Kim Tae-woo, Head of IVI Product Design Team 2 of Hyundai Mobis. “We simplified the structure and lowered the price by reducing the number of components by more than half, and eliminated the bracket or housing, which fastens different devices, to easily secure space.”
Hyundai Mobis greatly improved the efficiency and performance of this new system compared to existing products, and added such functions as the turn signal sound and charging status alarm as well as the artificiall engine sound. In keeping with the age of future cars when autonomous driving becomes common, it is necessary to inform pedestrians of the direction in which the vehicle is going or whether it is operating so that they can be prepared in advance. Also, it can be used as speakers for playing music during outdoor activities, such as camping.
Acoustic Vehicle Alert Sound (AVAS) is a speaker system that produces a sound outside of the vehicle so that pedestrians can sense an oncoming environmentally-friendly car that emits almost no noise. It is differentiated from ASD which produces an artificial engine sound inside the vehicle for the fun of driving. Governments around the world are making the artificial engine sound system mandatory to prevent accidents involving pedestrians from becoming more common as environmentally-friendly cars are too quiet.
This system, developed by Hyundai Mobis, installs the existing product, which used to be installed inside the vehicle in the form of complete speakers, on the back of the grill cover located on the front of the vehicle, in the form of a half-finished product. A speaker consists of the actuator, which actually generates sound, and the diaphragm, which propagates the sound to the outside. Hyundai Mobis separated the actuator, attached it to the grill cover and used the grill cover as the diaphragm of the speakers. Unlike existing speakers installed inside the electric vehicle with a blocked front, the grill cover, exposed to the outside, produces sound in this system and there is no acoustic pressure loss. So it is very efficient.
In hybrid cars which have both the engine and motor, the actuator is installed on the back of the front bumper for the same effect. Hyundai Mobis achieved this result only a year after it began development at the end of 2018, and applied for two related patents.