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Method and system for improving starting of a turbocharged engine

A technology of engine system and turbocharger, which is applied in the direction of combustion engine, engine control, engine components, etc., can solve the problems of increasing fuel consumption, increasing spark delay, and after-treatment devices cannot reach the working temperature fast enough, so as to reduce fuel consumption consumption, reducing the effect of unstable engine idling

Active Publication Date: 2014-03-26
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Even so, aftertreatment devices may not reach operating temperature quickly enough to comply with stringent vehicle emission levels
Also, increasing spark retard and engine air mass flow rate will increase fuel consumption and thus may be undesirable

Method used

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  • Method and system for improving starting of a turbocharged engine
  • Method and system for improving starting of a turbocharged engine
  • Method and system for improving starting of a turbocharged engine

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Embodiment Construction

[0023] The present invention relates to starting turbocharged engines. In one example, the turbocharged engine may be started in a manner that transfers additional exhaust energy to the emissions device. The method saves fuel and improves engine combustion stability during engine cold start idling. exist figure 1 An exemplary system is shown in . The engine and exhaust system can be Figure 7 The method runs to provide Figure 6 the sequence of. The method includes increasing a rotational resistance of a turbocharger turbine during engine start such that less exhaust energy is transferred to the turbocharger. Figure 2-5 Exemplary means for increasing turbine rotational resistance are shown.

[0024] refer to figure 1 , an internal combustion engine 10 comprising a plurality of cylinders— figure 1 One of the cylinders is shown - controlled by the electronic engine controller 12 . Engine 10 includes combustion chamber 30 and cylinder walls 32 with piston 36 positioned ...

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Abstract

A system and method for improving engine emissions is described. In one example, engine emissions may be improved via increasing rotational resistance of a turbocharger while a temperature of an exhaust after treatment device is less than a threshold temperature. The system and method may reduce an amount of time for the after treatment device to reach an operating temperature.

Description

technical field [0001] The present invention relates to a method and system for improving the starting of a turbocharged engine. Background technique [0002] Turbocharged engines offer the performance benefits of larger naturally aspirated engines. However, the cold start emissions of a turbocharged engine can be more than desired because the turbines within the turbocharger can extract heat energy from the engine exhaust before the exhaust reaches the exhaust aftertreatment device. As a result, less exhaust energy reaches the exhaust aftertreatment device and the amount of time for the exhaust aftertreatment device to reach operating temperature is increased. One way to increase the energy of exhaust gases reaching the aftertreatment device is to retard engine spark timing and increase engine air mass flow rate. Even so, aftertreatment devices may not reach operating temperature quickly enough to comply with stringent vehicle emission levels. Also, increasing spark reta...

Claims

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Application Information

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IPC IPC(8): F02B37/12
CPCF02B37/10F02B2039/168F02D41/0007F02D41/064F02D41/1497F02D2200/703Y02T10/12F02D23/00
Inventor K·D·伯德K·M·普拉根斯W·C·罗那
Owner FORD GLOBAL TECH LLC
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