Methods and systems for removing moisture from engine exhaust system
First Claim
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1. A method comprising:
- estimating a moisture level in at least one of an exhaust system and an intake system based on input from one or more of on-board cameras and a humidity sensor, and, responsive to each of a run-time of an engine of a vehicle during a drive cycle being below a threshold duration and the moisture level in one of the exhaust system and the intake system being higher than a threshold level, at a key-off event following the drive cycle, activating, via an electronic controller, an electric air compressor in the intake system to expel moisture from at least the exhaust system.
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Abstract
Methods and systems are provided for removing moisture from an engine exhaust system. In one example, a method includes, during a vehicle key-off condition, in response to a higher than threshold exhaust moisture level and a lower than threshold engine run time during an immediately prior drive cycle, operating an electric air compressor to remove the moisture accumulated in the exhaust manifold.
12 Citations
20 Claims
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1. A method comprising:
estimating a moisture level in at least one of an exhaust system and an intake system based on input from one or more of on-board cameras and a humidity sensor, and, responsive to each of a run-time of an engine of a vehicle during a drive cycle being below a threshold duration and the moisture level in one of the exhaust system and the intake system being higher than a threshold level, at a key-off event following the drive cycle, activating, via an electronic controller, an electric air compressor in the intake system to expel moisture from at least the exhaust system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 20)
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12. A method, comprising:
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at an onset of a drive cycle of a vehicle, estimating a first moisture level in an exhaust system of an engine; at a completion of the drive cycle, estimating a second moisture level in the exhaust system based on the first moisture level; and during an immediately subsequent vehicle key-off condition, responsive to the second moisture level being higher than a threshold level, activating, via an electronic controller, an air compressor to route compressed air from an engine intake manifold through the exhaust system, wherein the first moisture level is estimated based on one or more of an amount of moisture accumulated on a windshield of the vehicle during an immediately previous vehicle key-off condition, a variation in ambient humidity during the immediately previous vehicle key-off condition, and a dew point temperature at a location of the vehicle during the immediately previous vehicle key-off condition. - View Dependent Claims (13, 14, 15, 16)
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17. A system, comprising:
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a vehicle, including an autonomous vehicle and/or a hybrid vehicle; an electric machine coupled to a battery for propelling the vehicle; an engine including one or more cylinders, an intake manifold, and an exhaust manifold; an intake passage including a compressor, a charge air cooler (CAC) downstream of the compressor, and an intake throttle downstream of the CAC; a conduit coupled to the intake passage downstream of the compressor and upstream of the CAC, the conduit including a motor-driven electric compressor; an electric compressor bypass valve coupled at a junction of the intake passage and the conduit; one or more sensors including each of an ambient humidity sensor coupled to the intake manifold and an exhaust temperature sensor coupled to the exhaust manifold; one or more cameras to capture images of a windshield; an exhaust gas recirculation (EGR) passage coupling the exhaust manifold to the intake manifold, downstream of the compressor, the EGR passage including an EGR valve; and a controller with computer readable instructions stored on non-transitory memory to; estimate a moisture level in the exhaust manifold at an end of a drive cycle based on one or more images of the windshield, an ambient humidity as estimated via the ambient humidity sensor, a duration of engine operation, and a variation in exhaust temperature during the drive cycle; and in response to a higher than threshold moisture level, during an immediately subsequent vehicle key-off condition, operate the electric compressor to route compressed air through the exhaust manifold to remove moisture from the exhaust manifold. - View Dependent Claims (18, 19)
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Specification