Saturday, December 22, 2012

シトロエン ピュアテック 1.0Lエンジン (Citroen PureTech 1.0L EB0 engine)

The new engine is to be installed on Citroen's C3, DS3 and C4 Elysee. (I can imagine this engine going to be fitted on the  2014 "E3" modern 2CV).

The new engine is assembled at Trémery (France).

The 1.0 liter PureTech engine is a 3 cylinders type developing 68hp.
The engine fuel consumption is more efficient than 4 cylinders bigger engines due to the fact that there are less parts and less friction generated by only 3 pistons. (Consumption is 4.6L/100km).

The PureTech 1.0L engine is code named EB0 "VTi 68" engine.
It has a capacity of 999cc.
Maximum power is 50kW at  6,000 rpm is up by 6 kW compared to the 1.1 litre engine it will replace.

The engine feature a timing system with two overhead camshafts and four valves per cylinder, controlled directly by two mechanical push rods for enhanced fill-up and efficiency.

Continuous variable hydraulic timing for the intake and exhaust camshafts, for better performance at low and medium engine speeds and optimized fuel consumption.

Some 52 patents were filed in the development of the new engine family, 23 concerning engine architecture, 20 engine control and 9 special manufacturing processes and tools.

To get the engine up to temperature faster, the engine uses Split Cooling technology. 

When the car starts up, with the engine cold, the cooling circuits in the cylinder block and head are separated to optimize the warm-up process. This system has two advantages. One, it reduces CO2 emissions, which are higher when the engine is cold. And two, it helps to warm up the cabin faster.

Significant reduction in friction and the number of moving parts

The decisions made during the design phase of the PureTech engine family led to developments on a number of major parts aimed at reducing friction, which accounts for roughly 20% of the power consumed by an engine.

The main parts and components concerned were the crankshaft - and specifically its sizing - and the off-centered piston jackets.

The piston pins, segments and push rods in the timing system feature a low-friction coating (in diamond-like carbon) to keep friction down to a minimum
The regulated, variable-capacity oil pump continually provides optimal lubrication pressure.

The timing belt, wet and housed in a casing, has the same lifespan as the car itself. This technology also helps to reduce engine noise.

All these improvements make the PureTech engine the new benchmark on ultra-low friction, which has been reduced by 30% overall.
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