The engineers at Peugeot used a conventional rod-crank mechanism. The use of a 2-stage turbochargers helps in improving the engine performance. With the combination of VCR and the turbocharger, the engine’s power is doubled and the torque is tripled compared to a conventional gasoline engine.
The MCE-5 engine’s compression ratio changes according to the driving conditions. This allows the fuel consumption to reduce significantly up to 35%. This makes the MCE-5 concept the most efficient VCR till date. The compression ratio can be varied from 7:1 to 18:1.
The MCE-5 VCR engine is a flexible engine allowing each cylinder to have an independent compression ratio.
The MCE-5 varies compression ratio with the help of a rod-crank mechanism, gears and actuators. As you can see in the figure, a common cylinder head is used for the combustion chamber and the control jack chamber. Control jack is provided for each combustion chamber. Control jack is also known as the secondary piston. The Vertical movement of the control jack is controlled hydraulically. Both the piston and control jack move parallel to each other in the cylinder head.
The control jack is provided with a rack at its lower end which engages with a gear wheel which is pivoted to the smaller end of the connecting rod. The opposite side of this gear wheel also has gear teeth which mesh with a rack on the lower end of the piston. The other side of the piston rack is provided with another rack with finer teeth that drives a small gear wheel. As the piston moves up and down, the motion from the piston is transferred to the crankshaft via the piston rack, larger gear wheel and the connecting rod.
The compression ratio can be varied by moving the control jack. As the control jack moves up, the larger gear wheel pivots about the small end of the connecting rod, thereby pulling the piston down in the combustion chamber. As a result, the compression ratio is lowered. On the contrary, as the control jack moves down, the piston moves up and raises the compression ratio.
MCE-5 is a 1.5 liter engine producing 220 hp and 420 Nm torque. The engine was first used in Peugeot 407 model, launched in 2009 at the Geneva Auto show.
To know more about VCR Engines, click on the following link:The MCE-5 engine’s compression ratio changes according to the driving conditions. This allows the fuel consumption to reduce significantly up to 35%. This makes the MCE-5 concept the most efficient VCR till date. The compression ratio can be varied from 7:1 to 18:1.
The MCE-5 VCR engine is a flexible engine allowing each cylinder to have an independent compression ratio.
The MCE-5 varies compression ratio with the help of a rod-crank mechanism, gears and actuators. As you can see in the figure, a common cylinder head is used for the combustion chamber and the control jack chamber. Control jack is provided for each combustion chamber. Control jack is also known as the secondary piston. The Vertical movement of the control jack is controlled hydraulically. Both the piston and control jack move parallel to each other in the cylinder head.
The control jack is provided with a rack at its lower end which engages with a gear wheel which is pivoted to the smaller end of the connecting rod. The opposite side of this gear wheel also has gear teeth which mesh with a rack on the lower end of the piston. The other side of the piston rack is provided with another rack with finer teeth that drives a small gear wheel. As the piston moves up and down, the motion from the piston is transferred to the crankshaft via the piston rack, larger gear wheel and the connecting rod.
The compression ratio can be varied by moving the control jack. As the control jack moves up, the larger gear wheel pivots about the small end of the connecting rod, thereby pulling the piston down in the combustion chamber. As a result, the compression ratio is lowered. On the contrary, as the control jack moves down, the piston moves up and raises the compression ratio.
MCE-5 is a 1.5 liter engine producing 220 hp and 420 Nm torque. The engine was first used in Peugeot 407 model, launched in 2009 at the Geneva Auto show.
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