During engine idle or part load operating conditions, fuel injected into the combustion cycle may not be sufficient to maintain gas temperatures. Generating engine back pressure is a method for increasing engine out temperature. Back pressure can be achieved by utilising a valve after the turbocharger.
The electric water pump powered by a motor pumps cooling water to the engine to keep it at an optimal temperature.
For hybrid vehicles, its EHRS are widely used to reduce engine warm-up times to improve fuel economy, reduce emissions and provide cabin heating.