A Sequential Turbocharging Method for Highly-Rated Truck Diesel Engines

A sequential turbocharging method specifically developed for highly-turbocharged truck diesel engines is presented here together with the first experimental results. The key element of the method is the use of turbochargers of unequal size, with single entry turbines, in combination with a pulse converter. The first engine test showed a significant improvement of engine performance, especially of low-speed torque and response, without the usual compromise on high-speed performance. The main conclusion of the test was that with this sequential turbocharging method, engine performance is very competitive up to a bmep of 16 bar at rated power and 20 bar at peak torque.