Supercharged turbocompound hybrid engine apparatus
AssigneeFpt Motorenforschung AG
InventorChristian Maier
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Abstract
The present invention is relative to a control method of a turbo-compound engine apparatus wherein said apparatus comprises a low pressure compressor connected to the high pressure turbine and a low pressure turbine connected to a high pressure compressor by means of a coupling unit. The apparatus also comprises first bypassing means of said high pressure compressor. The method according to the invention comprises the step of deactivating said first bypassing means when at least a specific condition occurs.
Claims13
Control method of a turbo-compound engine apparatus, said apparatus comprising;
- an internal combustion engine (1) having an air intake line (2) and a gases exhaust line (20)
- a low pressure compressor (11) and an high pressure compressor arranged (5) on said air intake line according to the flow direction of the air;
- a high pressure turbine (6) and a low pressure turbine (7) arranged on said exhaust line according to the flow directions the gases,
- wherein the high pressure turbine (6) is connected with a shaft to the said low pressure compressor (11) and said low pressure turbine (7) is connected to the high pressure compressor (5) and wherein said low pressure turbine (11) and said high pressure compressor (5) are connected to the engine crankshaft,
- first bypassing means (3,4) of said high pressure compressor (5),
- first detecting means for measuring an exhaust gas temperature;
- second detecting means for detecting the Lambda value;
- means for measuring the pressure downstream and upstream said low pressure compressor;
- engine brake means;
- engine revolution speed sensor;
- wherein said control method comprises the step of deactivating said first bypassing means when at least one of the following condition occurs;
- a) an exhaust temperature exceeds a predefined value,
- b) said Lambda value is below a predefined value;
- c) said pressure ratio at the intake line (2) exceeds at least a surge value of said low pressure supercharger (11),
- d) the engine brake means are activated,
- e) said engine speed is below a predefined value.
A turbo-compound engine apparatus comprising:
- an internal combustion engine (1) having an air intake line (2) and a gases exhaust line (20)
- a low pressure compressor (11) and an high pressure compressor arranged (5) on said air intake line according to the flow direction of the air;
- a high pressure turbine and a low pressure turbine (7) arranged on said exhaust line according to the flow directions the gases,
- first bypass means for bypassing said high pressure turbine,
- wherein said high pressure turbine (6) is connected with a shaft to the said low pressure compressor (11) and wherein said high pressure compressor (5) is operated by said low pressure turbine and/or by said engine, said first bypassing means being deactivated when at least one of said condition occurs:
- an exhaust temperature exceeds a predefined value,
- b) said Lambda value is out of a predefined range;
- c) said pressure ratio at the intake line (2) exceeds at least a surge value of said low pressure supercharger (11),
- d) the engine brake means are activated,
- e) said engine speed is below a predefined value.
Dependencies are inferred from the claim text.