Press Release
Page 1: In short
Page 2: Design
Page 3: Body and Chassis
Page 4: Engine
Page 5: Safety
Page 6: Running Costs
Page 7: Production and Specs
Performance, economy and sophistication
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Toyota-developed 1.0-litre VVT-i petrol engine
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Lightest internal combustion engine available today, weighing 67kg
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Class-leading power and torque for 1.0-litre unit - 67bhp and 93Nm
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Lowest fuel consumption and CO2 emissions for a petrol engine in its segment
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1.4-litre diesel engine
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Supplied by PSA Peugeot Citroen
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Introduced to range January 2006
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All-aluminium construction with 54bhp and 130Nm
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Clever engine mounting system reduces noise, vibration and harshness levels
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Toyota Multi-mode Manual Transmission available with 1.0-litre VVT-i engine
NEW TOYOTA 1.0-LITRE THREE-CYLINDER VVT-i
This all-new petrol engine uses the latest technologies to deliver class-beating performance, fuel economy and low emissions.
A key development target was to achieve a low weight. The engine has an all-aluminium construction and features extra-slim cylinder bores, spaced just 7mm apart a smaller margin than on any other Toyota engine. The air intake system and engine cover are integrated into a single unit, another design first for Toyota.
Further weight-saving gains are made by producing components such as the throttle body and fuel injection ramp in resin instead of metal.
As a result, the new engine tips the scales at 67kg, making it the lightest internal combustion engine currently available on the car market.
More than that, it is the most powerful 1.0-litre engine, producing 67bhp, and also develops class-leading torque, with a maximum 93Nm at 3,600rpm. Aygo will accelerate from 0-62mph in 14.2 seconds and has a top speed, where permitted, of 98mph.
The engine has been developed to provide performance well-suited to the stop-start driving that's common to urban areas, with higher levels of low to mid-range torque than on the 1.0-litre VVT-i engine used in the Toyota Yaris. Close attention was paid to setting the best length for the intake manifold and a smaller diameter for the intake ports. Using longer spark plugs gives better anti-knock performance, in conjunction with VVT-i, which constantly adjusts valve timing to produce both high torque at low engine speeds and more power at higher revs.
Reducing the number of cylinders from four to three also improves torque performance in the low to mid-range.
High fuel economy and low emissions were also prime considerations. The engineering team began by reducing friction losses: the pistons have a new resin coating and thin, low-tension piston rings; and the crankshaft is slightly offset, consequently reducing friction between the piston and bore. The three-cylinder configuration also contributes to reducing the overall amount of friction, as there are fewer moving parts than in a four-cylinder engine.
As a result Aygo achieves best-in-segment combined cycle fuel consumption and CO2 emissions, at 61.4mpg and 109g/km respectively.
1.4-LITRE DIESEL ENGINE
A 1.4-litre diesel engine, supplied by PSA Peugeot Citroen, joined the Aygo range from January 2006. This all-aluminium unit develops 53bhp and is derived from the 69bhp 1.4-litre engine currently featured in Peugeot and Citroen vehicles.
With maximum torque of 130Nm at 1,750 rpm, the 1.4-litre diesel engine offers plenty of low-down torque for city driving.
The high pressure, common-rail diesel technology of the unit is not only very fuel efficient, with a combined fuel consumption of 68.9 mpg, but also quiet and smooth.
NEW ENGINE MOUNTING SYSTEM
Both Aygo engines feature a new engine mounting system that substantially reduces the levels of noise, vibration and harshness. Instead of the conventional three-mount design, Aygo uses a mount on each side, positioned on a line passing through the engine's centre of gravity. The third mount at the bottom of the engine compartment is replaced by a torque rod that efficiently suppresses the engine's rotational movement, reducing vibration. This innovation further demonstrates the fundamental superior quality Aygo brings to the city car class.
MULTI-MODE MANUAL TRANSMISSION
Toyota's Multi-mode Manual Transmission (MMT) is a manual transmission driven directly by electric motors and is available on Aygo with the 1.0-litre VVT-i engine. It features an automatic clutch and can be operated in two modes: E for fully automatic gearshifts and M for sequential gear selection by the driver.
MMT makes Aygo more relaxed and easier to drive around town, where traffic demands frequent gear changes. There is no penalty in fuel consumption, however, as MMT matches the economy of Aygo's standard five-speed manual gearbox.
The responsiveness of the transmission is aided by Delta Throttle Acceleration (DTA). If you press the throttle pedal sharply, the MMT electronic control unit (ECU) responds with a downshift to enable sharper acceleration. Similarly, if you come off the throttle suddenly, the ECU will hold the correct gear to allow engine braking, rather than up-shifting. The use of this logic system gives MMT a more natural operation and makes driving more pleasurable.
The MMT ECU also has a special shift control for up and downhill driving. When climbing a gradient, it selects the appropriate gear automatically to avoid unnecessary up and downshifts. Travelling downhill, the transmission constantly monitors braking and deceleration, shifting down the range to provide additional engine braking when appropriate.
