Nissan two-liter engine for the establishment of new standards for fuel economy
Horsepower, good flexibility and low noise operation and more economical – diesel engines and gasoline engines of comparable power performance, but also, in terms of fuel economy, diesel engines than in spark-ignition engine fuel economy clear advantage.
By the Renault and Nissan to jointly develop the gR engine is a displacement of 1995cc 4-cylinder engine with 16 valves, bore 84 mm, stroke 90, the compression ratio up to 16:1. This engine has two models with different power of 110 kilowatts and 127 kilowatts. Two types of engines are equipped with 6-speed manual transmission, gear ratio varies with the model.
Installed in the Renault Megane compact car models on the 110 kW engine is the most efficient C-Class is one of several models. Speed is 2000: Pm, the maximum torque of 34ONm. Per 100 km fuel consumption of 54 liters of carbon dioxide emissions and only 144 g / km.
Of course, diesel engine, the nitrogen oxides and particulate matter is a major pollutant. To reduce these two pollutants on the air-fuel ratio and fuel injection needs a careful optimization. This engine used a set of technologies to ensure their emissions to meet the Euro 4 standards.
In order to reduce pollution at source on the nature of part of the exhaust from the combustion chamber immediately return, once again injected into the intake manifold. Electronic engine management system according to different parameters of the engine by controlling exhaust gas recirculation valve to change the volume. There is also a cooled exhaust gas recirculation device to control the temperature.
127 kilowatts of engine model comes with renewable particulate filter. It can remove particles from exhaust fumes. When the filters are overflowing, the engine will start recycling process. About every 500 to 1000 km on the need for a regeneration cycle, each lasts about 20 minutes. During this period, through the second after the injection to the exhaust heat. When the temperature reaches 570 ℃ above, the filter in the accumulation of smoke began to oxidation, and then be cleared. This filter on the restoration of clean up, soot particles can be filtered again.
127 kilowatts of engine models installed in the Laguna family car, it's power in the D-level car is the top. Maximum torque of 360Nm, achieved in 1750''300Orpm range.
Common Rail fuel system, variable geometry turbocharger and piezoelectric injector to ensure such high performance. But also to ensure appropriate levels of engine noise, which is technically a very serious challenge.
Common Rail Injector for fuel injection pressure of 1,600 atmospheres, through the four valves per cylinder, fuel injected, in order to get better air / fuel mixture. System provided by Bosch piezoelectric injectors. This injector is more accurate and faster than the solenoid valve injector 4 times.
Injector at a rate sufficient to cycle the ignition for 5 times injection. Slowly through two pre-injection combustion, to improve the sound characteristics and reduce the possibility of engine knocking cylinder. Main jet torque and power produced: the first part of post-injection can be burned fumes, and the second particulate filter is used to make renewable.
The cylinder head intake and exhaust port relative to each other, so that every root can control intake valve camshaft and exhaust valve. Because each side of the cylinder has inlet and into the combustion chamber from different angles, thus produce a double vortex. A result, inflatable air intake capacity and scavenging capacity were enhanced.
Control the noise level is the design process, priority consideration. Deep-skirt engine with cast iron block, aluminum alloy ladder bracket bearings absorb vibration.
127 kilowatts type of engine is also equipped with dual balance shafts, can balance the vibration when the engine rotation, which high-speed engine is particularly evident when the role.
Double mass damping flywheel can play the role of voice filters that can offset the normal operation of the engine speed when the small change. Flywheel between the engine and clutch with a spring mass. It can filter out low-speed movement when the crankshaft is not continuous.
Transmission can also play a role in reducing noise transmission. 6-speed transmission with 3-axis pressure casting of aluminum alloy to reduce weight. Off-axis surface of the gearbox casing and gear closer, thus reducing the resonance. Renault and Nissan invested 500 million euros (about 48.7 billion yuan) to develop this engine, of which 2 million euros (19.5 billion yuan) for product and process design. Industrial development accounted for 25 million euros (24.4 billion RMB). Suppliers of equipment accounted for 50 million euros (about 48.7 billion yuan).
Engine, such as n cl in France manufactured here powertrain production accounts for Renault and Nissan's 40%. Last year the plant produced 780,000 engines and 880,000 gear-boxes.
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