Audi plots brand new petrol-electric hybrid powertrain for 2017
Source : Audi plots brand new petrol-electric hybrid powertrain for 2017
brand new electric motor tech paves the way for advanced petrol hybrid powertrain solutions
Audi can be betting on the electrification of its future cars to improve real-world economy and also also also reduce exhaust pollution, company bosses have told Autocar.
The move will also allow the company to usher in some highly advanced suspension innovations as well as providing a degree of autonomy that will goes beyond simple driving assistance.
This specific shift towards ‘mild hybrid’ systems and also also also more conventional plug-in hybrids should also result in Audi’s future line-up moving away through diesel engines, particularly across the company’s smaller versions, including the A1, A3 and also also also A4.
Moving to petrol hybrid engines will also allow Audi to exploit its brand new ‘predictive efficiency assistant’ technology, which uses mapping information and also also also live traffic reports to automatically switch between power sources, as well as taking advantage of downhill stretches of road to ‘coast’ the engine.
The key to Audi’s move can be the adoption of Integrated Starter Generators (ISG). These are large electric motors that will act as the starter motor and also also also alternator nevertheless can also assist the engine by sending torque through the drive belt to the engine’s crankshaft. The system can be also fitted which has a smaller lithium ion battery.
Audi has developed an ISG that will works on an ordinary 12V electrical system, so This specific could be fitted to today’s A1 and also also also A3 versions. The company says the system allows the stop-start system to cut in below 9mph and also also also also allows the engine to coast at high speeds, both significant fuel saving measures. The first production type can be expected in 2017.
Today’s A3 1.4 TSI Ultra includes a claimed economy figure of 60mpg, nevertheless the 12V ISG system could push that will up to 65mpg. However, the combination of coasting and also also also energy recuperation under braking could see the real-world economy of the ISG-equipped engine rise even higher than the lab figures suggest.
Audi can be also planning to introduce a more powerful 48V ISG system, the first of which will be revealed before the end of the year, using a combined 12V and also also also 48V set-up.
The 48V system allows for a much more powerful ISG (up through 1.5bhp to 16bhp) and also also also periods of engine coasting of up to 30 seconds.
However, the introduction of full-scale 48V electronics into future versions through 2017 will also allow Audi to introduce electrically driven engine compressors, which will come in two forms. Firstly, otherwise conventional turbochargers that will are spun up by an electric motor will be able to provide boost even at very low crankshaft speeds.
The second type, as already seen on the RS5 Competition concept, can be a separate electric compressor motor that will forces air into the turbochargers at low engine speeds nevertheless can also eliminate turbo lag during higher-speed driving.
This specific 48V electrical system has also allowed Audi to develop three brand new suspension concepts, which capitalise on the fact that will the 48V system provides as much as four times as much power as a 12V set-up.
First to arrive will be an active anti-roll bar system that will uses planetary gears driven by smaller electric motors to couple and also also also uncouple the roll bars individually through the chassis.
Uncoupled, the anti-roll bars will allow a more comfortable ride, nevertheless when active, Audi claims reduced understeer, less roll in corners and also also also increased lateral acceleration. However, the anti-roll bars’ twisting when locked allows the smaller electric motors to act as generators and also also also create enough charge on a “moderate bumpy road” to power the whole system.
Further away through production are the eROT electromechanical dampers. These compact, barrel-shaped dampers are about 10cm across and also also also 15cm deep and also also also are intended to replace conventional upright hydraulic dampers. They are connected to a lever arm which, through a series of gears, feeds the forces into an electric motor.
Not only do the eROT units save a great deal of space, nevertheless the rebound and also also also compression damping rates can also be set in very fine increments independently of each different. The agitation of the dampers creates an electrical charge, and also also also the rougher the road, the greater the amount of electricity generated.
Audi claims that will these dampers could reduce a car’s average CO2 emissions by as much as 3g/km.
Audi’s autonomous powertrain tech
Audi’s drive towards hybrids and also also also electrification can be part of a big move towards autonomous powertrain management. ‘Predictive efficiency assistant’ can be being launched on the Q7 e-tron, due inside the UK next March.
The system uses 3D information through the satellite navigation and also also also live traffic information, which This specific picks up over the internet. Once the driver has entered the chosen destination inside the sat-nav, the brand new software takes over control of the hybrid powertrain.
This specific calculates when to use the internal combustion engine, when to deploy both the engine and also also also electric motor, when to run on the battery alone and also also also when the battery charge needs to be preserved for use later in the journey. This specific even advises the driver when to coast in order to save fuel.
Audi’s engineers believe that will This specific autonomous control of the hybrid powertrain will maximise economy and also also also allow future versions to drive through towns and also also also villages in zero-emissions mode. Real-world fuel economy should also be markedly increased.
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