Device and process for overfeeding compressed gas to an intake pipe of a turbocharged engine
Method and device ( 1 ) for boosting an intake pipe ( 4 ) of a turbocharged engine ( 5 ) with compressed gas. The method includes storing gases in a vessel ( 12 ) at a pressure greater than atmospheric pressure and, afterwards in injecting the gases into the intake pipe ( 4 ) in order to temporarily increase an inlet pressure during low-speed operation phases. The inventive device includes a connection for temporarily and alternately connecting the storing vessel ( 12 ) to an exhaust manifold ( 6 ) for recovering the gases during engine brake phases or to the intake pipe ( 4 ) during the temporary low-speed operation phases. The connection comprises a heat exchanger ( 10 ) mounted between the exhaust manifold ( 6 ) and the vessel ( 12 ).
1. A process for overfeeding of compressed gases at an intake pipe ( 4 ) of a turbocharged engine ( 5 ) in the low-speed operation phases, said process comprising:
storing gases inside a storage vessel ( 12 ) at a pressure greater than atmospheric pressure and injecting said gases in the intake pipe ( 4 ) and thereby boosting intake pressure of the turbocharged engine;
recovering the compressed gases at an exhaust pipe ( 6 ) of the engine ( 5 ) during engine brake phases;
cooling the compressed gases in a heat exchanger ( 10 );
conveying the compressed gases to the storage vessel ( 12 );
storing the compressed gases in the storage vessel ( 12 ); and
reinjecting the compressed gases into the intake pipe ( 4 ) during low-speed operation phases.
2. A device ( 1 ) for overfeeding compressed gases in an intake pipe ( 4 ) of a turbocharged engine ( 5 ) comprising:
said device ( 1 ) being configured to store the gases in a storage vessel ( 12 ) at a pressure greater than atmospheric pressure and then inject the gases in the intake pipe ( 4 ) to boost intake pressure in low-speed operation phases;
said device further comprising connection means for connecting the storage vessel ( 12 ) temporarily and alternatively either with the exhaust manifold ( 6 ) to recover gases during engine brake phases, or with the intake pipe ( 4 ) during low-speed operation phases; and
said connection means comprises a heat exchanger ( 10 ) arranged between the exhaust manifold ( 6 ) and the storage vessel ( 12 ).
3. The device as recited in claim 2 , wherein the heat exchanger ( 10 ) is of the gas/liquid type.
4. The device as recited in claim 1 , wherein the tube ( 7 , 8 ) supplying the exchanger ( 10 ) with hot gas is split.
5. The device as recited in claim 2 , wherein the tube ( 20 ) channeling cooled gas to the output of the exchanger ( 10 ) is single.
6. The device as recited in claim 2 , wherein the connection means comprise at least one pressure sensor ( 14 ) for measuring the pressure of the gases inside the intake pipe ( 4 ).
7. The device as recited in claim 6 , wherein the connection means comprises a control unit ( 13 ) for controlling the different electro-valves ( 3 , 7 , 8 , 11 , 16 ) as a function of the signal transmitted by the pressure sensor ( 14 ).
8. The device as recited in claim 2 , wherein the connection means comprises tubes ( 17 - 20 ) for conveying the gases from the exhaust manifold ( 6 ) to the storage vessel ( 12 ) and from the storage vessel ( 12 ) to the intake pipe ( 4 ).
9. The device as recited in claim 8 , wherein the connection means comprises tubes ( 17 - 20 ) and electro-valves ( 3 , 7 , 8 , 11 , 16 ) belonging to a recycling system of burnt gases pre-equipping the engine ( 5 ).
10. The device as recited in claim 8 , wherein the connection means comprises at least one electro-valve ( 3 , 7 , 8 , 11 , 16 ) for opening and closing portions of tubes ( 17 - 20 ) to effect, alternatively, storage of the gases in the storage vessel ( 12 ) then reinject the gases in the intake pipe ( 4 ).
11. The device as recited in claim 10 , wherein the connection means comprises a control unit ( 13 ) for controlling the different electro-valves ( 3 , 7 , 8 , 11 , 16 ) as a function of the signal transmitted by the pressure sensor ( 14 ).
12. The device as recited in claim 10 , wherein the connection means comprises tubes ( 17 - 20 ) and electro-valves ( 3 , 7 , 8 , 11 , 16 ) belonging to a recycling system of burnt gases pre-equipping the engine ( 5 ).