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 is usually betting on the electrification of its future cars to improve real-world economy as well as 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 which goes beyond simple driving assistance.
This kind of shift towards ‘mild hybrid’ systems as well as 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 types, including the A1, A3 as well as also A4.
Moving to petrol hybrid engines will also allow Audi to exploit its brand-new ‘predictive efficiency assistant’ technology, which uses mapping information as well as 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 is usually the adoption of Integrated Starter Generators (ISG). These are large electric motors which act as the starter motor as well as also alternator yet can also assist the engine by sending torque through the drive belt to the engine’s crankshaft. The system is usually also fitted that has a tiny lithium ion battery.
Audi has developed an ISG which works on an ordinary 12V electrical system, so the idea could be fitted to today’s A1 as well as also A3 types. The company says the system allows the stop-start system to cut in below 9mph as well as also also allows the engine to coast at high speeds, both significant fuel saving measures. The first production product is usually expected in 2017.
Today’s A3 1.4 TSI Ultra incorporates a claimed economy figure of 60mpg, yet the 12V ISG system might push which up to 65mpg. However, the combination of coasting as well as 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 is usually 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 as well as also 48V set-up.
The 48V system allows for a much more powerful ISG (up through 1.5bhp to 16bhp) as well as also periods of engine coasting of up to 30 seconds.
However, the introduction of full-scale 48V electronics into future types through 2017 will also allow Audi to introduce electrically driven engine compressors, which will come in two forms. Firstly, otherwise conventional turbochargers which 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, is usually a separate electric compressor motor which forces air into the turbochargers at low engine speeds yet can also eliminate turbo lag during higher-speed driving.
This kind of 48V electrical system has also allowed Audi to develop three brand-new suspension concepts, which capitalise on the fact which 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 which uses planetary gears driven by tiny electric motors to couple as well as also uncouple the roll bars individually through the chassis.
Uncoupled, the anti-roll bars will allow a more comfortable ride, yet when active, Audi claims reduced understeer, less roll in corners as well as also increased lateral acceleration. However, the anti-roll bars’ twisting when locked allows the tiny electric motors to act as generators as well as 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 as well as also 15cm deep as well as 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, yet the rebound as well as 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, as well as also the rougher the road, the greater the amount of electricity generated.
Audi claims which 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 as well as also electrification is usually part of a big move towards autonomous powertrain management. ‘Predictive efficiency assistant’ is usually being launched on the Q7 e-tron, due from the UK next March.
The system uses 3D information through the satellite navigation as well as also live traffic information, which the idea picks up over the internet. Once the driver has entered the chosen destination from the sat-nav, the brand-new software takes over control of the hybrid powertrain.
the idea calculates when to use the internal combustion engine, when to deploy both the engine as well as also electric motor, when to run on the battery alone as well as also when the battery charge needs to be preserved for use later in the journey. the idea even advises the driver when to coast in order to save fuel.
Audi’s engineers believe which This kind of autonomous control of the hybrid powertrain will maximise economy as well as also allow future types to drive through towns as well as also villages in zero-emissions mode. Real-world fuel economy should also be markedly enhanced.
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