Enhanced tractive power at low speeds
First Claim
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1. A method for operating an internal combustion engine, comprising:
- determining a coolant temperature of an engine coolant of the internal combustion engine;
comparing the coolant temperature with a predetermined threshold temperature;
reducing a thermal input into the engine coolant by increasing a charging pressure of the internal combustion engine via turbocharger compressor operation responsive to a coolant temperature higher than the predetermined threshold temperature, wherein increasing the charging pressure increases a charge air temperature;
determining the charge air temperature, where the charge air temperature is the charge air temperature of a charge air of the internal combustion engine,increasing the charging pressure of the internal combustion engine based on the charge air temperature;
determining a difference in charging pressure as a function of the charge air temperature; and
increasing the charging pressure of the internal combustion engine based on the difference in charging pressure.
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Abstract
A method is disclosed for operating an internal combustion engine in which a coolant temperature of an engine coolant of the internal combustion engine is determined and is compared with a predetermined threshold temperature. If the coolant temperature is higher than the predetermined threshold temperature, a thermal input into the engine coolant is reduced by changing at least one operating parameter of the internal combustion engine. This can be done, for example, by raising a charging pressure of the internal combustion engine.
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Citations
12 Claims
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1. A method for operating an internal combustion engine, comprising:
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determining a coolant temperature of an engine coolant of the internal combustion engine; comparing the coolant temperature with a predetermined threshold temperature; reducing a thermal input into the engine coolant by increasing a charging pressure of the internal combustion engine via turbocharger compressor operation responsive to a coolant temperature higher than the predetermined threshold temperature, wherein increasing the charging pressure increases a charge air temperature; determining the charge air temperature, where the charge air temperature is the charge air temperature of a charge air of the internal combustion engine, increasing the charging pressure of the internal combustion engine based on the charge air temperature; determining a difference in charging pressure as a function of the charge air temperature; and increasing the charging pressure of the internal combustion engine based on the difference in charging pressure. - View Dependent Claims (2, 3, 4)
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5. A motor vehicle with an engine and a controller that is configured to:
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determine a coolant temperature of an engine coolant of the engine; reduce a thermal input into the engine coolant by compressing charge air with a compressor of a turbocharger to increase a charging pressure of the engine responsive to a coolant temperature higher than a predetermined threshold temperature, where increasing the charging pressure increases a charge air temperature of the engine, where the charging pressure of the engine is increased based on the charge air temperature of the engine, where a difference in charging pressure is determined as a function of the charge air temperature, and where increasing the charging pressure of the engine is based on the difference in charging pressure as the function of the charge air temperature. - View Dependent Claims (6, 7, 8)
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9. A method for reducing a thermal input of an engine, comprising:
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increasing a charging pressure of the engine based on a charge air temperature relative to a maximum charge air temperature responsive to a coolant temperature above a predetermined threshold temperature, the coolant temperature determined based on a sensor, determining a difference in charging pressure as a function of the charge air temperature, and increasing the charging pressure based on the difference in charging pressure. - View Dependent Claims (10, 11, 12)
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Specification