Exhaust system and method for mitigating degradation of components of a turbocharged engine with exhaust gas recirculation
First Claim
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1. An engine system, comprising:
- an engine including intake and exhaust camshafts and at least one component other than an emissions after treatment device or emissions sensor;
an exhaust system coupled to the engine;
a particulate sensor positioned in an exhaust system; and
a controller including instructions stored in non-transitory memory for adjusting a position of the intake and exhaust camshafts to limit degradation of the at least one component in response to an output of the particulate sensor, and further instructions for adjusting an amount of reductant injected to the exhaust system in response to condensation of reductant indicated via the particulate sensor.
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Abstract
A system and method for controlling an engine is described. In one example, an actuator is adjusted to reduce the possibility of degradation of an engine component. The method may provide increase engine compon ent operational life so as to improve engine emissions during the life cycle of the engine.
79 Citations
20 Claims
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1. An engine system, comprising:
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an engine including intake and exhaust camshafts and at least one component other than an emissions after treatment device or emissions sensor; an exhaust system coupled to the engine; a particulate sensor positioned in an exhaust system; and a controller including instructions stored in non-transitory memory for adjusting a position of the intake and exhaust camshafts to limit degradation of the at least one component in response to an output of the particulate sensor, and further instructions for adjusting an amount of reductant injected to the exhaust system in response to condensation of reductant indicated via the particulate sensor. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An engine system, comprising:
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an engine including at least one component other than an emissions after treatment device; an exhaust system coupled to the engine and including a reductant injector; a particulate sensor positioned in an exhaust system; an actuator coupled to the engine; and a controller including instructions stored in non-transitory memory for adjusting a position of the actuator to limit physical degradation of the at least one component and an amount of reductant injected from the reductant injector in response to condensation of reductant indicated via the particulate sensor. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A method for operating an engine, comprising:
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adjusting an amount of EGR supplied to an engine via adjusting intake and exhaust valve timing in response to output of a particulate matter sensor indicating an amount of particulate matter in engine exhaust exceeding a level indicative of degradation of an engine turbocharger component; and adjusting an amount of reductant injected to an exhaust system coupled to the engine in response to condensation of reductant indicated via the particulate matter sensor. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification