Audi plots fresh petrol-electric hybrid powertrain for 2017
Source : Audi plots fresh petrol-electric hybrid powertrain for 2017
fresh 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 along with 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 of which goes beyond simple driving assistance.
This specific shift towards ‘mild hybrid’ systems along with more conventional plug-in hybrids should also result in Audi’s future line-up moving away by diesel engines, particularly across the company’s smaller types, including the A1, A3 along with A4.
Moving to petrol hybrid engines will also allow Audi to exploit its fresh ‘predictive efficiency assistant’ technology, which uses mapping information along with 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 of which act as the starter motor along with alternator although can also assist the engine by sending torque through the drive belt to the engine’s crankshaft. The system is usually also fitted which has a smaller lithium ion battery.
Audi has developed an ISG of which works on an ordinary 12V electrical system, so This specific could be fitted to today’s A1 along with A3 types. The company says the system allows the stop-start system to cut in below 9mph along with also allows the engine to coast at high speeds, both significant fuel saving measures. The first production type is usually expected in 2017.
Today’s A3 1.4 TSI Ultra incorporates a claimed economy figure of 60mpg, although the 12V ISG system would certainly push of which up to 65mpg. However, the combination of coasting along with 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 along with 48V set-up.
The 48V system allows for a much more powerful ISG (up by 1.5bhp to 16bhp) along with periods of engine coasting of up to 30 seconds.
However, the introduction of full-scale 48V electronics into future types by 2017 will also allow Audi to introduce electrically driven engine compressors, which will come in two forms. Firstly, otherwise conventional turbochargers of 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 of which forces air into the turbochargers at low engine speeds although can also eliminate turbo lag during higher-speed driving.
This specific 48V electrical system has also allowed Audi to develop three fresh suspension concepts, which capitalise on the fact of 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 of which uses planetary gears driven by smaller electric motors to couple along with uncouple the roll bars individually by the chassis.
Uncoupled, the anti-roll bars will allow a more comfortable ride, although when active, Audi claims reduced understeer, less roll in corners along with increased lateral acceleration. However, the anti-roll bars’ twisting when locked allows the smaller electric motors to act as generators along with create enough charge on a “moderate bumpy road” to power the whole system.
Further away by production are the eROT electromechanical dampers. These compact, barrel-shaped dampers are about 10cm across along with 15cm deep along with 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, although the rebound along with compression damping rates can also be set in very fine increments independently of each different. The agitation of the dampers creates an electrical charge, along with the rougher the road, the greater the amount of electricity generated.
Audi claims of 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 along with 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 within the UK next March.
The system uses 3D information by the satellite navigation along with live traffic information, which This specific picks up over the internet. Once the driver has entered the chosen destination within the sat-nav, the fresh software takes over control of the hybrid powertrain.
This specific calculates when to use the internal combustion engine, when to deploy both the engine along with electric motor, when to run on the battery alone along with 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 of which This specific autonomous control of the hybrid powertrain will maximise economy along with allow future types to drive through towns along with villages in zero-emissions mode. Real-world fuel economy should also be markedly enhanced.
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