Brussels,
26
November
2012
|
02:00
Europe/Amsterdam

Efficient full hybrid, petrol and diesel powertrains

• Projected sales mix of 1/3rd full hybrid, 1/3rd diesel and 1/3rd petrol

• Average CO2 emissions reduced by 13% to just 109 g/km overall

• Auris Hybrid delivers class-leading CO2 emissions of 87 g/km and almost no NOx and Particulate Matter emissions

• Revised 2.0 D-4D offers enhanced low speed torque, stop/start with extended idling technology and significantly lower emissions

• All engines feature new Charging Control System to lower alternator power generation load for improved fuel efficiency

• Optional MultiMode clutchless automated manual and Multidrive S continuously-variable transmissions

With the launch of the new Auris the average CO2 emissions level will drop to just 109 g/km, a further 13% reduction on average compared to the previous generation.

This has been achieved by taking a total vehicle approach to emissions reduction and fuel consumption improvement, whilst at the same time improving drivability and dynamic performance.

The new Auris' powertrain line-up plays a key role. It now features a choice of a class-leading full hybrid alongside two petrol and two diesel engines offering the performance- and economy-enhancing benefits of Toyota Optimal Drive.

The new Auris' anticipated pan-European sales mix will be approximately 1/3rd full hybrid, 1/3rd diesel and 1/3rd petrol. This not only demonstrates the wide range of customer choice the line up brings, but also that, far from a niche solution, full hybrid is a mainstream proposition, accessible to the largest possible audience.

Full Hybrid System Performance

The Auris full hybrid returns class-leading emissions figures of only 87 g/km in the European homologation combined cycle.

Capable of operating both independently and in combination, the HSD system's 1.8 litre VVT-i petrol engine and electric motor generate a maximum power output of 136 DIN hp, equipping the Auris Hybrid with a 0-100 km/h acceleration time of 10.9 seconds and a maximum speed of 180 km/h.

Thanks to the improved aerodynamic performance and lighter weight of this next generation model the Auris Hybrid's remarkably low, highly tax-efficient CO2 emissions have improved by 2 g/km to 87 g/km (with 15" wheels). In addition, the Auris Hybrid generates virtually no NOx and Particulate Matter emissions.

Moreover, when operating in the unique, switchable EV mode not available to mild hybrid vehicles, the Auris Hybrid generates zero CO2, NOx and particulate emissions, driving for up to two kilometres continuously at speeds of up to about 50 km/h, dependant on battery charge and driving conditions.

The Auris Hybrid's powertrain is designed to eliminate the need for the petrol engine as often as possible during city driving. Toyota's own data show that the cumulative effect of full hybrid operation leads to high proportions of zero-emissions driving.

Improved Hybrid Synergy Drive — An Even More Compelling Proposition

The control logic of the Hybrid Synergy Drive system's seamless, planetary gear transmission has been modified to give a smoother, more natural feeling to vehicle acceleration, with a closer relationship between vehicle speed and engine revs.

Advanced engine technologies include a cooled Exhaust Gas Recirculation (EGR) system, an electric water pump, the elimination of the auxiliary drive belt, a reduction in piston ring tensional force and the optimisation of oil pump capacity.

When used in combined with a cooled EGR system, the Atkinson cycle engine offers significant gains in fuel efficiency and the reduction of emissions.

In the Atkinson cycle, compression and expansion are asymmetrical, and the inlet valves close late, delaying compression. This creates a high expansion ratio for less compression, converting combustion energy to engine power more effectively. As a result, the exhaust temperature is lower than that of conventional engines. The cooled EGR system reintroduces cooled exhaust gas into the intake system, further reducing engine operating temperatures.

The adoption of an electric water pump both enhances engine warm-up performance and reduces cooling friction loss, improving fuel efficiency. The elimination of the auxiliary drive belt reduces friction, further improving fuel economy.

With the repackaging of the battery pack under the rear seat, the cooling air intake is relocated from the side of the seats to the seat undercover area. This relocation allows for a lower intake air temperature, enhancing battery cooling and, hence, efficiency.

Toyota Optimal Drive

Toyota Optimal Drive showcases a combination of wide-ranging advanced technologies and internal improvement programmes designed to optimise the balance of performance and driving enjoyment with fuel economy and low emissions.

These diverse core technologies focus on three key aspects of powertrain development:

Firstly, the reduction of powertrain weight through the use of super-lightweight and highly compact engine components and transmissions throughout the new Auris engine range.

Secondly, the minimisation of mechanical losses through the adoption of Valvematic -a further development of VVT-i -in the 1.6 petrol engine, new roller rocker technology and smaller, lighter pistons in both petrol engines, low viscosity oil and 6-speed manual transmissions throughout the new Auris engine range.

Thirdly, the maximisation of combustion efficiency. This has been achieved within the new Auris petrol engine range through the use of high, 11.5:1 compression ratios, Valvematic, the refinement of intake port and combustion chamber design, and piston cooling by oil jet. All new Auris diesel engines benefit from low compression ratios, optimised combustion chamber dimensions and enhanced Exhaust Gas Recirculation (EGR) cooler efficiency.

2.0l D-4D Diesel Engine

Mated to a six-speed manual transmission, the 91 kW / 124 DIN hp 2.0 litre D-4D turbodiesel engine has been extensively revised and now features Stop & Start technology as standard.

Enhancing low speed torque, the unit features a new, compact, variable nozzle turbocharger with a DC motor, a lower friction bearing system and an electric actuator.

CO2 emission-reducing lubrication and cooling circuit improvements include a 2-stage pressure oil pump with improved oil jet, an optimised water pump with a reduced flow rate, and a twin-chamber oil pan to improve engine warming speeds.

Exhaust emissions are further lowered through a new glow plug control strategy and improvements to the construction and coating of the DPF.

The use of a resin cylinder head cover, oil cooler bracket and water pipe reduce engine weight by 3 kg. The reduction of friction through the adoption of a low friction vacuum pump, a low friction timing chain and low viscosity oil further enhance fuel efficiency. And combustion improvement through a new piston bowl shape and the new glow strategy has perceptibly lowered engine NVH.

Significantly quieter, the revised 2.0 D-4D engine now delivers maximum torque of 310 Nm at 1,600 to 2,400 rpm, whilst low speed torque has increased to 300 Nm at only 1,400 rpm. This torque delivery enhancement has allowed the use of longer gear ratios to reduce both fuel consumption and noise. CO2 emissions have been lowered by 19% -from 138 to 112 g/km on the combined cycle. Fuel consumption has also fallen from 5.2 to 4.3 l/100km over the combined cycle.

1.4l D-4D Diesel Engine

Available with either a six-speed manual or six-speed MultiMode transmission, the Euro 5 compliant 1.4 litre D-4D engine develops 66 kW / 90 DIN hp and maximum torque of 205 Nm at only 1,800 to 2,800 rpm.

Equipped with Stop & Start technology for the first time in the new Auris, the 1.4 D-4D 90 turbodiesel unit also benefits from improved Toyota Optimal Drive technology, maximising performance and driveability whilst minimising fuel consumption, and CO2 and particulate emissions.

New generation piezoelectric injectors control the fuel volume and the timing of the injection more accurately. The high speed reaction time of Piezo injectors makes multi-phase high speed injection possible. This has the effect of both lowering the rate of combustion expansion and effecting a more thorough burn within the combustion chamber, thus further reducing particulate, NOx and CO2 emissions.

This, allied to higher common rail injection pressures of 160 Mpa, results in shorter injection times, combining a faster engine response with improved fuel economy and reduced CO2 emissions.

A new 2-step hydraulic control valve is installed in the timing chain cover. This has the benefit of reducing friction when hydraulic pressure is low by opening and closing the relief valve based on driving conditions.

Engine warm-up time is minimised through the installation of a new coolant by-pass system that helps to reduce heat losses in engine coolant during start-up.

When equipped with the manual transmission and Stop & Start technology, the improved 1.4 D-4D 90 unit returns a combined cycle fuel consumption of 3.8 l/100 km and generates CO2 emissions of only 99 g/km — a reduction of 0.6 l/100 km and 10 g/km.

1.33l Dual VVT-i Petrol Engine

Featuring innovative Stop & Start technology, the 1.33 litre petrol engine is equipped with Dual Variable Valve Timing-intelligent (VVT-i) and a high compression ratio of 11.5:1, which increases the thermal efficiency of the engine. It generates 73 kW/99 DIN hp and maximum torque of 128 Nm at 3,800 rpm.

This excellent dynamic performance is combined with fuel consumption from 5.4 l/100 km and CO2 emissions from 125 g/km, a reduction of 0.4 l/100 km and 11 g/km versus the outgoing model.

Profiting from Toyota's extensive motorsport experience, the small bore, long stroke unit is exceptionally lightweight and compact, improving the vehicle's power-to-weight ratio. It features a resin-type cylinder head cover and intake manifold, and the intake channel has been streamlined to optimise airflow for improved combustion efficiency.

Dual VVT-i helps boost response levels across the entire rev range by varying the air-fuel intake and exhaust valve timing to suit the conditions at any given time. In addition to improving torque at low and medium engine speeds, the system also reduces emissions and enhances fuel efficiency.

1.6l Valvematic Petrol Engine

Offering class-leading efficiency, power and torque, Valvematic is a further development of Toyota's highly successful Dual Variable Valve Timing-intelligent (Dual VVT-i) system.

Valvematic takes VVT-i technology a step forward by adding lift and duration control to the inlet valve variable timing. This improves intake airflow volume and speed management -and, subsequently, combustion process management- to deliver more power for less fuel consumption, with reduced CO2 emissions. The adoption of Valvematic further reduces friction and pumping losses under light engine loads, further lowering fuel consumption.

Valvematic efficiency is further improved through the adoption of a variable length inlet manifold. This acts as an accelerator at low to medium engine speeds, maximising inlet air speed for optimum combustion efficiency. At higher engine speeds the manifold is fully open. This allows air to travel via a shorter route, maximising the volume of air entering the combustion chamber and, hence, engine power output.

Available with either a six-speed manual or Multidrive S CVT, the 1.6-litre Valvematic engine develops 97 kW / 132 DIN hp and a maximum torque of 160 Nm at only 4,400 rpm.

When equipped with the manual transmission the unit returns a combined cycle fuel consumption of 5.9 l/100 km and generates CO2 emissions of only 138 g/km — reduction of 0.7 l/100 km and 12 g/km. Multidrive S transmission further reduces both fuel consumption and emissions, to 5.7 l/100 km and 134 g/km respectively.

New Charging Control System

Petrol and diesel engined Auris models are now fitted with a new Charging Control system designed to lower the alternator power generation load on the engine when driving, enhancing fuel efficiency.

The system controls the amount of power generated by the alternator according to driving conditions. Under deceleration, the system increases the power generation voltage to maximise battery charging, whilst decreasing the voltage at all other times. As a result, the overall engine load caused by power generation is reduced, improving fuel consumption.

MultiMode Transmission

Available on the 1.4 D-4D 90 diesel version of the new Auris, MultiMode is an automated manual transmission with a fully automatic shift mode and no clutch pedal. It offers the driver a choice of two, fully automatic gear change modes or a manual, sequential gear change with steering wheel-mounted shift paddles.

Selecting E (Economy), M (Manual) or R (Reverse) allows the car to 'creep' in the manner of a conventional automatic. In E mode, the car makes automatic gear shifts that will maximise fuel economy. Selecting ES (Sport) mode will delay changing up to a higher rpm, giving a more sporting style of drive.

Multidrive S Continuously-Variable Transmission

Newly available on the 1.6 Valvematic petrol version of the new Auris, Multidrive S is a continuously-variable transmission (CVT) with a fully automatic seamless shift mode or a sequential, stepped 7-speed Sport mode.

In Automatic mode, the system is optimised for quietness and fuel economy, precisely matching the transmission to the engine at all times by monitoring accelerator pedal angle, vehicle speed and braking force.

In Sport mode, the system is optimised for response and direct engine control, and the transmission step position can be selected by the gear lever, or by the shift paddle.

Sport mode also features precise cornering control. Upon detecting deceleration, the system downshifts and applies engine braking to assist the braking force. On corner exit, predictive downshift logic controls the system to ensure the optimal gear ratio is selected for required level of acceleration.

Stop & Start Technology

Now available with the 1.33 litre Dual VVT-i petrol engine and the 1.4 litre D-4D diesel engine, and fitted as standard on the 2.0 litre D-4D diesel engine, Toyota's Stop & Start system automatically switches off the engine when the vehicle is stopped.

Featuring an immediate restart with virtually no engine sound or vibration, the system delivers significant reductions in CO2 emissions during urban driving, and can lead to noticeably lower average fuel consumption, depending on driving conditions.

Stop & Start automatically stops the engine when the shift lever is moved to the neutral position and the clutch pedal is released, enhancing fuel economy. The engine will automatically restart, within less than half a second, when the clutch pedal is depressed.

Toyota Stop & Start technology allows for the continued operation of the air-conditioning system, and idling stop time when the air conditioning is in use has been expanded.

With the air-conditioning in use, the engine will not stop if the desired cabin temperature has not been reached. When that temperature is reached, the air-conditioner will switch to 'ECO-run loading', allowing the engine to automatically stop. The engine will automatically restart in the event of low battery charge, or if the vehicle begins to move, in the interest of safety.

In conjunction with the Stop & Start system, a 'Stop & Start' indicator will illuminate during every automatic stop. An ECO counter also displays the elapsed time of stops during each drive, and a re-settable ECO odo-counter displays the vehicle's total accumulated idling stop time.

Note: All fuel consumption and emissions data is subject to final homologation