Turbocharger is an important method to improve fuel economy of internal combustion engines. Traditional turbocharger matching methods show their limitations that only consider the matching between turbocharger and engine under the single designed operating point. This paper is to study the turbocharger matching based on vehicle performance requirements, in which performance requirements among vehicle, engine and turbocharger system are fully considered.
The study is based on a vehicle which is equipped with 1.5L Chinese produced engine. Vehicle powertrain and gasoline engine simulation models were built in one-dimensional simulation software and verified by experiments. According to the vehicle performance, to study the matching under multiple working conditions, new European drive cycle (NEDC), full-load condition and high altitude condition, the matching of four kinds of turbochargers with a gasoline engine were compared respectively. Turbocharger matching analysis was conducted according to the distribution of the working points of NEDC cycle. Due to the dispersion of the working points at NEDC cycle, to simplify the calibration, working area was divided into 10 parts and the frequency distribution at each area was calculated. Thus, turbocharger was matched with the engine based on the vehicle performance requirements.