城市道路工况下改进的发动机起停节油控制策略

Abstract

随着车辆油耗限值标准越来越严格，为了降低燃油消耗率、满足标准，很多车辆装有怠速起停系统。但实际城市运行工况下的分析表明，在早晚高峰时期车辆频繁地短时怠速停车，导致起停系统频繁起停，这不仅会影响驾驶舒适性更不能实现起停系统应有的节油效果。因此对实际工况的行驶情况进行分析，找到早晚高峰等频繁短时怠速停车的工况特点，提出了改进的起停控制策略。改进方法先根据工况的特点判断工况类别，再判断是否需要关闭发动机。所提出的改进的控制策略，能够有效地减少起停系统在早晚高峰时段的频繁起停，提升起停系统的节油效果。实际行驶工况的节油分析表明改进后的起停系统确实能够实现更好的节油效果。 With the vehicle fuel consumption limits becoming more and more strict, many vehicles are equipped with an idle start-stop system to reduce fuel consumption and meet standards. However, analysis of real urban running conditions shows that, vehicle frequently stop during early morning peak and evening peak hours and frequently start and stop engine, what resulting in not only bad driving comfort but also a loss of fuel economy. Therefore, according to the analysis of real urban driving cycle, the improved start-stop control strategy, which determines to shut down the engine or not based on cycle type determination, is proposed. The proposed improved start-stop control strategy could decrease frequent start-stop and achieve better fuel economy. Fuel saving analysis of the real urban driving condition showed that improved start-stop strategy can get better fuel economy.