Loughborough University
Leicestershire, UK
LE11 3TU
+44 (0)1509 222222
Loughborough University

Turbo Discharging

Technology

Engine testing

Delivering an effective engine air system is critical to the success of powertrain products.

Using a novel divided exhaust flow arrangement, the blow-down flow from the engine cylinders and the associated energy usually lost as part of the exhaust gas flow is recovered by a turbine. During the main displacement flow from the engine the turbine is by-passed and the crankshaft does not have to do any work exhausting the burnt gases through the turbine. The result is the recovery of the blowdown energy without negatively impacting the engine crankshaft torque. This energy is then used to depressurise the exhaust system which generates extra crankshaft torque during the exhaust stroke giving a primary torque increase and CO2 emission reduction.

Secondary benefits (not included in the above fuel economy estimates) include increased energy availability from the blowdown pulse and potentially improved low speed torque (through increased pressure drop across the turbine). There will be less hot exhaust gas residuals within the cylinder which will extend the knock limit of turbocharged spark ignition engines allowing further downsizing or increased compression ratio.

Importantly, the effect on the combustion system is small allowing the Turbo-Discharging approach to be used with all current and future IC engines without significant redesign. The technology requires the addition of:

  1. A turbocharger like turbo-machine (no VGT, possibly a wastegate – but not essential)
  2. A heat exchanger comparable to an EGR heat exchanger
  3. A more complex exhaust manifold with one connection to each exhaust port

The addition of a heat exchanger is not necessary when applying to a powertrain that includes exhaust thermal energy recover.

The technology is additive and can work directly with turbocharging systems. The addition of turbo-discharging increases the energy that can be extracted from the exhaust gases allowing fuel economy improvements and potential improvements in engine transient response.

Find out more about the research team and our collaborations to date.

 

Contact us

Dr Graham Carlin
Intellectual Property Commercialisation Manager

+44 (0) 1509 222452