Patent application number | Description | Published |
20140060009 | SECONDARY AIR INTRODUCTION SYSTEM AND METHOD FOR SYSTEM OPERATION - A vehicle system operation method is provided. The method comprises, during a first operating condition, increasing back pressure in a first exhaust conduit positioned upstream of a turbine and downstream of a first emission control device and during a second operating condition, reducing back pressure in the first exhaust conduit and flowing boosted air from downstream of a compressor into a second exhaust conduit positioned upstream of a second emission control device and downstream of the turbine. | 03-06-2014 |
20140174074 | TWIN TURBOCHARGER WASTEGATE CONTROL - An engine system comprises a first turbocharger including a first wastegate, first wastegate actuator, and first turbocharger sensor, a second turbocharger including a second wastegate, second wastegate actuator, and second turbocharger sensor, and a controller configured to adjust the first wastegate actuator so that a parameter of the first turbocharger matches a parameter of the second turbocharger, based on output from the first and second turbocharger sensors. In this way, turbocharger output between the two turbochargers may be balanced. | 06-26-2014 |
20140260241 | METHODS AND SYSTEMS FOR BOOST CONTROL - Methods and systems are provided for improving boost response. A continuously variable compressor recirculation valve and a wastegate are adjusted in complementary frequency bands to move compressor operation away from a surge limit and reduce boost delivery errors. An intake throttle is also concurrently adjusted to offset manifold air-flow rate errors resulting from the wastegate or recirculation valve adjustments. | 09-18-2014 |
20140316675 | PRESERVING COMBUSTION STABILITY DURING COMPRESSOR-SURGE CONDITIONS - A method to avoid over-dilution of an intake-air charge of an engine includes, during a first condition, applying at least some feedback control to the opening and closure of a valve that adjustably admits exhaust to the intake-air charge. During a second condition predictive of compressor surge, no feedback control is applied to the opening or the closure of the valve. Rather, feedforward control is applied to the closure of the valve so that stability in the engine is maintained even during surge conditions. | 10-23-2014 |
20140352669 | METHODS AND SYSTEMS FOR PROVIDING TRANSIENT TORQUE RESPONSE - A method and system for providing a suitable engine torque response during a transient condition is presented. In one example, when a desired inlet manifold pressure is greater than a throttle inlet pressure of a first throttle, a second throttle positioned upstream from the first throttle is opened to increase the throttle inlet pressure. The method may provide an appropriate torque response while minimizing impact on fuel economy. | 12-04-2014 |
20140360179 | METHOD AND SYSTEM FOR BINARY FLOW TURBINE CONTROL - Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control. | 12-11-2014 |
20140360180 | METHOD AND SYSTEM FOR BINARY FLOW TURBINE CONTROL - Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control. | 12-11-2014 |
20140360181 | METHOD AND SYSTEM FOR BINARY FLOW TURBINE CONTROL - Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control. | 12-11-2014 |
20140360182 | METHOD AND SYSTEM FOR BINARY FLOW TURBINE CONTROL - Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control. | 12-11-2014 |
20140360183 | METHOD AND SYSTEM FOR BINARY FLOW TURBINE CONTROL - Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control. | 12-11-2014 |
20140360184 | METHOD AND SYSTEM FOR BINARY FLOW TURBINE CONTROL - Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control. | 12-11-2014 |
20140360185 | METHOD AND SYSTEM FOR BINARY FLOW TURBINE CONTROL - Methods and systems are provided for adjusting the opening of a scroll valve of a binary flow turbine. Scroll valve adjustments are used at different engine operating conditions to improve engine performance and boost response. Scroll valve adjustments are coordinated with wastegate and EGR valve adjustments for improved engine control. | 12-11-2014 |
20150047340 | METHODS AND SYSTEMS FOR CONDENSATION CONTROL - Methods and systems are provided for reducing condensate accumulation at a charge air cooler (CAC) during cold ambient conditions. A wastegate may be held closed while a compressor recirculation valve is held open during an engine cold start so as to use compressor heating and increased compressor recirculation to expedite CAC heating. EGR delivery is delayed until the CAC is sufficiently warm to reduce the propensity for condensation. | 02-19-2015 |
20150047341 | METHODS AND SYSTEMS FOR BOOST CONTROL - Methods and systems are provided for varying a proportion of compressed air recirculated to a compressor inlet from a location downstream of the compressor and upstream of a charge air cooler and a location downstream of the charge air cooler. A temperature-controlled compressor recirculation flow is used to reduce condensation from EGR being ingested into the compressor. The temperature-controlled compressor recirculation flow is also used to address compressor surge. | 02-19-2015 |
20150047342 | METHODS AND SYSTEMS FOR BOOST CONTROL - Methods and systems are provided for coordinating adjustments to a compressor recirculation valve with adjustments to a binary flow turbine scroll valve to reduce surge. The scroll valve is closed to increase turbine energy while the compressor recirculation valve is opened to increase compressor flow. Concurrent adjustments to a wastegate may be used to provide boost pressure control. | 02-19-2015 |
20150047343 | METHODS AND SYSTEMS FOR SURGE CONTROL - Methods and systems are provided for improving a margin to surge. A compressor recirculation valve is held at a semi-open position during steady-state boosted engine operation and operation in a soft surge region. The valve is fully opened to reduce hard surge, or fully closed to meet a transient increase in boost demand. | 02-19-2015 |
20150047346 | METHODS AND SYSTEMS FOR BOOST CONTROL - Methods and systems are provided for varying a proportion of compressed air recirculated to a compressor inlet from a location downstream of the compressor and upstream of a charge air cooler and a location downstream of the charge air cooler. A temperature-controlled compressor recirculation flow is used to reduce condensation from EGR being ingested into the compressor. The temperature-controlled compressor recirculation flow is also used to address compressor surge. | 02-19-2015 |
20150047347 | METHODS AND SYSTEMS FOR BOOST CONTROL - Methods and systems are provided for managing a compressor temperature using EGR to address surge and condensation. A variable mixture of cooled compressor recirculation flow and hot EGR is provided to a compressor inlet. A composition of the mixture is adjusted to maintain a compressor inlet temperature sufficiently warm so as to reduce ingestion of condensation, and a compressor outlet temperature sufficiently cold to be within component temperature limits with flow above the surge limit. | 02-19-2015 |
20150047605 | METHODS AND SYSTEMS FOR SURGE CONTROL - Methods and systems are provided for recirculating compressed air across a compressor through a high flow and a low flow compressor recirculation path. Flow through the recirculation paths is controlled via respective valves and valve opening is adjusted based on a throttle mass flow so as to maintain a compressor flow rate at or above a surge constrained flow rate. By maintaining a sufficiently high compressor flow rate during steady state and transient conditions, the compressor state can be maintained outside a surge region. | 02-19-2015 |
20150051762 | METHODS AND SYSTEMS FOR TORQUE CONTROL - Methods and systems are provided for improving surge control. When surge conditions are approached, a reference governor reduces engine airflow at a slower rate and to a higher level than the engine airflow required to meet the reduced torque demand. The excess torque resulting from the extra airflow is offset by applying a negative torque on the driveshaft via an electric machine coupled to the engine or via alternate engine actuator adjustments. | 02-19-2015 |
20150071759 | METHODS AND SYSTEMS FOR LOW-PRESSURE EXHAUST GAS RECIRCULATION - A method for controlling air flow through a compressor recirculation passage, comprising: during a first condition: reducing air flow through the compressor recirculation passage based on a margin, the margin based on a rate of air flow at a compressor inlet, a rate of air flow through the compressor recirculation passage, and a rate of EGR flow. In this way, the CRV recirculation flow may be controlled to be less than the amount that could potentially backflow into an air filter disposed in the air intake passage, thus preventing EGR contained in the CRV recirculation flow from fouling the air filter with soot, oil and water. | 03-12-2015 |