1. Turbo-Discharging Overview
A Joint Development Between AltEnergis Plc & Loughborough University

2. Introduction Turbo-Discharging
Using turbine recovered exhaust gas energy to depressurise the exhaust system.
Directly contributes to improved engine efficiency and enables further efficiency benefits.
Added Value:
Widespread applicability
Complementary technology
Retrofittable
Cost effective
Improved turbocharger transient response
Higher torque
Improved knock margin
Further downsizing
Reduced EGR
Improved fuel economy

3. Turbo-Discharging
Experimentally demonstrated and studied only at Loughborough University
4-stroke gasoline NA automotive engine
Aftermarket turbocharger used as turbo-discharger
Fixed geometry and timing of cams
Demonstrated significant torque and fuel economy benefit (more than 7% and ~5% respectively)
4 stroke architecture:
Widely applicable:
Applicable to naturally aspirated or turbocharged engines
Thermodynamic concept can be applied to 2 or 4 stroke engines
Ideally suited to gas powered CHP and gasoline fuelled engines
Better suited to large diesel engines than small* (*Due diligence by Mott MacDonald)
Heat exchanger sized for key design points e.g. low-mid load
Split manifold isolates blowdown pulse

4. Summary and Outlook 2007: Invention 2010: Feasibility Study
Unique
Fundamental thermodynamic advantage
Best suited to low/no boost conditions
Best suited to low AFR conditions
Applicable across a range of architectures
2010: Feasibility Study
Experimental proof-of-concept
>7% torque increase
~5% (max) efficiency benefit
Extended knock margin
Benefits on both NA and TC engines
Complementary to charging and compounding, particularly for ‘off-design’ points
2013: Demonstrator Programme
Stationary power
Turbocharged
Gas fuelled
Gregory Day