EXPERIMENTAL INVESTIGATION ENERGY BALANCE AND DISTRIBUTION OF A TURBOCHARGED GDI ENGINE FUELLED WITH ETHANOL AND GASOLINE BLEND UNDER TRANSIENT AND STEADY-STATE OPERATING CONDITIONS

Abstract

In this paper, the energy balance and distribution of a turbocharged gasoline direc injection engine fuelled with ethanol and gasoline blend and powered the passenger car under transient and steady-state conditions were independently investigated. Then, the energy balance under transient conditions was comprehensively compared with steady-state behaviors under the bench test. The results indicated that the exhaust gas energy was much higher than the brake power at the high speed and high load zone. In addition, the maximum percentage of exhaust gas energy in total energy was located at high speed and medium load area, and showed a very good potential exhaust heat recovery. The coolant energy surpassed brake power and exhaust gas energy on the low speed and low load area and its percentage in total energy exceeded 30%, and in some operation points, it reached up to 50%. Compared energy balance under the transient condition with the steady-state condition, all the operating points were located on the low to medium speed and low to medium load area. In addition, the effective efficiency was located below the isolines of 25% or lower at the urban driving cycle, while the effective efficiency was much higher at extra urban driving cycle.