Latest Technique to Improve Driving Surge in CVVT Engine Vehicle 2005-01-2301

This paper presents a series of experimental and analytical works to improve driving surge in a vehicle with CVVT (Continuous Variable Valve Timing) engine. To fully understand the surge mechanism, comprehensive vehicle tests were performed in relations to engine pressure variations, rotational dynamics of driveline, and rigid body dynamics of powertrain. Base on such experimental results, a simple yet reliable model was developed and simulated to optimize driveline. This study found that parameters, such as characteristics of the clutch in a torque converter, roll mode of powertrain, and timing of CVVT, were shown to have noticeable influence on performance of driving surge. A significant improvement in surge vibration was possible by optimizing each of these parameters both through simulations and experiments.