Idle Speed Control of Gasoline Engine for Hybrid Electric Vehicle

Hybrid Electric Vehicles use electric throttle instead of mechanical throttle as to distribute power and optimize performance of gasoline engine. At present, in order to keep oil pump and compressor working normally, idle speed control is still needed for some HEV gasoline engines. This article introduces the method we used in the development of idle speed control system based on electric throttle. Besides, the construction and working principle of idle speed control system are given in detail. The software function validation and the preliminary calibration, which are fulfilled in the bench test, indicate that electric throttle has the ability to control idle speed and the method developed by us could control idle speed with high stability and precision.