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US 8,616,186 B2Granted
Exhaust gas recirculation (EGR) system
AssigneeFord Global Technologies, LLC
InventorsGopichandra Surnilla, Daniel Joseph Styles, Mrdjan J. Jankovic, Julia Helen Buckland, Amey Y. Karnik
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Abstract
Various systems and methods are described for an exhaust gas recirculation (EGR) system coupled to an engine in a vehicle. One example method comprises, calculating an EGR mass flow from a difference between measurements of clean air mass flow and total mass flow, and correcting for a transient mass flow error.
Claims14
An engine control method, comprising:
- delivering low-pressure exhaust gas recirculation (EGR) to downstream of an intake throttle and upstream of a turbocharger compressor;
- and
- adjusting an operating parameter based on EGR mass flow identified from a difference between a measured clean air mass flow entering the intake throttle and a total mass flow measured and indicated by a mass air flow sensor positioned downstream from the turbocharger compressor and upstream of a charge air cooler, the turbocharger compressor being a first turbocharger compressor for a first cylinder bank, and the total mass flow being measured downstream from a junction of the first turbocharger compressor and a second turbocharger compressor for a second cylinder bank.
A system for an engine in a vehicle, comprising:
- a turbocharger including a first compressor and a turbine;
- a first throttle upstream of the compressor;
- a first mass flow sensor upstream of the first throttle;
- a low-pressure exhaust gas recirculation (LP-EGR) system, the LP-EGR system routing LP-EGR from downstream of the turbine to upstream of the compressor and downstream of the first throttle;
- a second throttle downstream of the compressor;
- a charge air cooler downstream of the compressor;
- and
- a second mass flow sensor positioned downstream of the compressor, upstream of the charge air cooler, upstream of the second throttle, and downstream from a junction of the first compressor and a second compressor of a second turbocharger.
5 more elements
Dependencies are inferred from the claim text.