Method of controlling vehicle emissions

Abstract

A method of controlling a vehicle engine comprises a) determining at least two engine operational parameters selected from the following parameters: i) CO2 output, ii) power output iii) NOx output; b) averaging the values of said two parameters during a driving window; c) providing a nominal reference curve relating said two of the following engine parameters; d) comparing the result from step b) with said reference curve to determine a measure of how far the parameter averages obtained from step b) are from the reference curve; e) adjusting control of one or more engine systems dependent on the result of step d).

Description

technical field [0001] The present application relates to a method of controlling vehicle emissions and applies to both gasoline and diesel engines. It applies particularly, but not exclusively, to engines with exhaust gas recirculation (EGR). Background technique [0002] With the introduction of Real Driving Emissions (RDE) to the Euro 6d regulation, passenger cars must meet certain emission limits under wider conditions than in the past. Under Euro 6b and earlier regulations, engine manufacturers were required to comply with emission limits for the mild pseudo-steady state NEDC cycle. Engine calibration mostly focuses on this. [0003] Thus, under random driving conditions (non-cycling) Euro 6d vehicles are cleaner than earlier versions of the regulation, especially with regard to NO for diesel vehicles x emission. [0004] Control NO of RDE x Emissions require extensive use of all available devices provided by engine H / W and aftertreatment systems. However, reducin...

AI Technical Summary

Problems solved by technology

Although this approach greatly limits the CO 2 penalty, but it also poses some legal risks as it does not cover all theoretical driving styles

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