● closing cylinders art EA211 model with 1.4 liter turbocharged direct injection engine
Based on the public tap MQB modular platform for the newly developed code is 1.4T EA211 different turbocharged engine, and is currently codenamed EA111 public generally used as the 1.4T engine is that it uses an aluminum cylinder block, so that the overall weight will be smaller, most importantly, on the basis of technical staff the addition of a set of active ACT cylinder management system, and only the two cylinders can be closed by the other two cylinders operating under certain conditions.
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relying Audi AVS system to achieve closing cylinder [ 123]
closing cylinder technology is actually not really a new technology, Chrysler, Honda has this technology on the car, but at present it is mainly used in the higher number of cylinders V6 and V8 engines, and this times which lowered onto a 4-cylinder engine is the first time a small displacement.
this has closed cylinder 1.4T engine technology should be said that a good reference of AVS Audi variable valve lift technology, this AVS system is achieved simply changing the valve lift and timing of different conditions by switching two different cam angles. Closing cylinder system only need to AVS system high cam angle of the cam can be replaced without lift, and in the Audi V8 4.0TFSI closing cylinder has been used for this technique.
◆ the cylinder running cause vibration and temperature maldistribution problems
When implanted in this art after a four-cylinder engine, a very difficult the issue will follow a mdash; mdash; vibration. When the load is low, the system will automatically close the intake and exhaust valves of the cylinders 2,3, cylinder 4 is only pushed crankshaft rotation. The work machine cylinder 1-3-4-2 sequence, in the case where only two work cylinders, acting angular interval of the engine reaches 360 degrees, plus work cylinder 4 is the same as above under, this will inevitably lead to engine productionStudents more substantial vibration, thus affecting comfort.
2,3 cylinder stopped in the middle of work, it will no longer generates heat, only the both ends of the case body 4 by a cylinder continue to work, which in turn leads to uneven distribution of the temperature of the cylinder, how to deal with a series of questions cylinder deformation problems arising therefrom is placed in front technician a problem.
this 1.4T maximum power of 140 horsepower engine, equipped with stop-start, energy recovery techniques. Mounted in the Audi A3 0 ~ 100 km / h acceleration time less than 8 seconds. Audi survey of many national road conditions to determine the optimal time of a closed cylinder, that is, the engine torque at 1250-4000rpm and 25 to 100 cattle middot; start under the conditions of this closed-meter cylinder system. When the driver depresses the accelerator pedal, the two cylinders will be closed quickly resume work within 13-36 milliseconds, the system can detect a vehicle in which the intelligent environment and traffic congestion, the smart function is disabled closed cylinder. The driver can be learned from the multi-function display on the dashboard of the car is currently running four-cylinder or two-cylinder operation.
◆ EA211 1.4TSI model variable cylinder engine works
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