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Added on the 12/09/2018 09:15:13 - Copyright : Auto Moto EN
The series development process of the BMW i7 in entering its final phase with the car undergoing a demanding test programme in extreme road and weather conditions. During so-called hot-region testing on tracks and public roads all over the world, the development engineers primarily verify the performance and reliability of the electric motors, the all-wheel drive and the high-voltage battery when being exposed to maximum stress from high temperatures, unpaved roads, dust and large differences in altitude. The road to series production takes the prototypes of the BMW i7 over gravel tracks into deserts, into the mountains and on a whole series of highly dynamic routes. The BMW i7, the world's only purely electrically powered luxury sedan, will be presented in the course of 2022 together with other model variants of the new BMW 7 Series.The endurance test in the hot regions of various countries and continents serves in particular to test and safeguard all components of the electric drive system. The components of the fifth-generation BMW eDrive technology developed for the BMW i7 demonstrate their unrestricted functionality even under the most adverse conditions when being used continuously in extremely high outside temperatures, permanent sunlight and dry conditions.
The series development process of the BMW i7 (power consumption combined: 22.5 – 19.5 kWh/100 km according to WLTP; CO2 emissions: 0 g/km; forecast based on the vehicle's development status to date) in entering its final phase with the car undergoing a demanding test programme in extreme road and weather conditions. During so-called hot-region testing on tracks and public roads all over the world, the development engineers primarily verify the performance and reliability of the electric motors, the all-wheel drive and the high-voltage battery when being exposed to maximum stress from high temperatures, unpaved roads, dust and large differences in altitude. The road to series production takes the prototypes of the BMW i7 over gravel tracks into deserts, into the mountains and on a whole series of highly dynamic routes. The BMW i7, the world's only purely electrically powered luxury sedan, will be presented in the course of 2022 together with other model variants of the new BMW 7 Series.The endurance test in the hot regions of various countries and continents serves in particular to test and safeguard all components of the electric drive system. The components of the fifth-generation BMW eDrive technology developed for the BMW i7 demonstrate their unrestricted functionality even under the most adverse conditions when being used continuously in extremely high outside temperatures, permanent sunlight and dry conditions.
With the consistent expansion of its range to further vehicle segments, the BMW Group is pushing ahead with the transformation to electric mobility. During the forthcoming year, the Munich-based premium automobile manufacturer will already present the world’s first all-electric luxury sedan – the BMW i7. Within the framework of its series development process, the BMW i7 is currently undergoing driving dynamics testing on the premises of the BMW Group winter test centre in Arjeplog, Sweden. There, just a few kilometres away from the Arctic Circle, test engineers find the frozen surfaces and snow-covered roads offering the ideal preconditions for the integrated application of all drive and suspension systems. With the test programme held in the biting cold, they pave the way to a new interpretation of luxury driving pleasure. For the first time, it will be possible to experience a maximum in characteristic BMW dynamics, comfort and supremacy in the luxury class with absolutely zero local emissions.The suspension components, steering and braking systems as well as driving dynamics and vehicle stability systems developed for the future generation of the BMW 7 Series are designed to raise the balance between sportiness and ride comfort so typical of the brand’s luxury sedans to the next level. This also includes performance-oriented tuning of the wheel suspension, springs, dampers and various regulating systems to match the various different drive types. They all undergo intensive testing in Arjeplog under extreme climate conditions.
Before it can go into series production, the new edition of the sports sedan must first complete a programme of testing whose breadth and intensity far exceed the stresses and strains of everyday driving. Welcome to Death Valley, in the US state of Nevada. Here, it is not only the automatic climate control system of the new BMW 3 Series Sedan that can expect a taxing work-out. The multi-day heat tests see the cars fried repeatedly in the sun for several hours, then cooled and thoroughly checked over. Everything has to work, there can be no squeaks or creaks – even when the temperature tops 50 degrees Celsius in the shade outside the car and 60 degrees inside, and the interior is then cooled again as quickly as possible. The heat certainly gives the electronics something to think about, but that’s not the whole story: the electromagnetic rays emitted by the hydroelectric plant at the Hoover Dam represent the ultimate test of strength for the functional reliability of the electronic systems on board the new 3 Series. This is why all the car’s functions – from the digital instrument cluster to the tyre pressure indicator – are tested extensively in the shadows of the huge forest of electricity pylons on the banks of Lake Mead. At the same time, another development team is putting engines, transmissions and brakes through their paces. They are even given police protection for their runs up and down the 4,000-metre-high Mount Whitney. While law enforcement secures the test route at the top and bottom of the climb, the testers hustle the prototypes time and again up the snaking roads and back down – accelerating hard and braking suddenly to a standstill with crushing frequency. The bone-dry desert roads of Death Valley and beyond also provide an ideal place to find out how effective the cars’ flaps, doors, bonnets and lids are at keeping out dust. In their test drives around the gambling hot-spot of Las Vegas, the engineers leave nothing to chance.
The purpose of this second round of testing in Sweden was to fine-tune all powertrain and chassis control systems. Thanks to their low-grip surfaces, the test areas sited on frozen lakes around Arjeplog were particularly well suited for delicately adjusting the drive torque control system in the BMW i5 under precisely reproducible conditions. In the new BMW i5, the DSC (Dynamic Stability Control) system, the near-actuator wheel slip limitation function and the drive torque control system are interlinked so that they can interact and complement each other flexibly in any driving situation. As a result, the all-electric sedan performs at least as proficiently as any conventionally powered model on ice and snow.The integrated application of all powertrain and chassis systems underpins the outstanding handling abilities displayed by the BMW i5 in winter testing. The more challenging the conditions, the more impressive were the speed and precision of the control systems in the fully electric version of the new BMW 5 Series Sedan. The BMW i5 serves up a harmonious blend of optimum traction when pulling away and supreme driving stability when cornering or braking, which is unique in the competitive environment.
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