长城哈弗H7车发动机智能起停系统不工作

正故障现象一辆长城哈弗H7车,搭载型号为GW4C20A的发动机,累计行驶里程约为6万km。据驾驶人反映,车辆行驶过程中仪表盘上的发动机智能起停指示灯一直呈黄色点亮,无法转为正常工作状态下的绿色指示灯,且车辆在停车等待交通信号灯时,发动机智能起停系统不工作,发动机无法自动停机。     

广汽本田奥德赛车起停系统不工作

正故障现象一辆年产本田奥德赛车,搭载发动机,累计行驶里程约为4.5万km,因起停系统不工作而进店检修。故障诊断接车后首先试车验证故障现象。系上安全带,起动发动机,进行路试,在路况较好的城区路面上行驶约10 min,然后在交通红绿灯前将车辆停下,发现起停系     

2019款东风悦达起亚K2车怠速起停系统工作异常

<正>故障现象一辆2019款东风悦达起亚K2车,搭载G4FG发动机,累计行驶里程约为9 400 km。车主反映,行驶至路口停车等红灯时,怠速起停(ISG)系统自动使发动机熄火,接着组合仪表提示“怠速起停已解除请起动发动机”(图1),同时蓄电池警告灯和机油压力警告灯点亮;松开制动踏板,发动机无法自动起动,但可以使用车钥匙起动。     

2013款奥迪A4L车自动起停功能失效

<正>故障现象一辆2013款奥迪A4L车,搭载CDZ发动机,累计行驶里程约为10万km。车主反映,在路口停车等交通信号灯时,发现该车自动起停功能失效,发动机无法自动熄火。故障诊断接车后,首先确认自动起停功能为开启状态,然后进行路试,发现行驶中踩下制动踏板,当车辆停止后,发动机不会自动熄火,确认自动起停功能失效;观察     

插电式混合动力汽车变参数能量管理策略

为进一步提高新型插电式混合动力汽车(PHEV)的整车经济性,考虑到影响整车经济性的2个主要因素——行驶工况和行驶里程,提出了变参数能量管理策略。为减小车辆行驶工况的影响,应用模糊欧几里德贴近度方法,建立了基于典型循环工况的车辆行驶工况识别控制策略;为减小车辆行驶里程的影响,应用模糊识别的方法,建立了以车辆行驶里程和车辆启动时的动力电池荷电状态(SOC)为输入,行驶里程模式为输出的车辆里程模式识别控制策略;最后对整车能量管理策略进行了仿真分析。结果表明:在同等行驶里程的新欧洲行驶循环(NEDC)工况下,与定参数能量管理策略相比,变参数能量管理策略可以降低整车等效百公里油耗5%以上,从而提高了PHEV的整车经济性。     

动态跳跃点火(DSF)停缸技术节油效果

动态跳跃点火(DSF)为一项全可变停缸技术,发动机的每一个气缸都可以动态地执行停缸操作。其控制逻辑对停缸作出适当搭配,在兼顾NVH的同时,赋予了发动机更广泛的停缸范围,停缸缸数增加,节油能力优于传统停缸技术。基于车辆实测解析评估,一款1.4T轿车改装DSF在中国工况CLTC_P下的节油效果近于怠速起停的收益,例如7%左右。DSF在不同工况下节油效果有差别,数据显示NEDC循环下节油率略优于CLTC_P循环。DSF可以与48 V技术、智能控制技术、米勒循环发动机及均质稀燃发动机技术相配合,达成综合节油,这些组合为汽车厂家满足第五阶段油耗目标值提供了技术选项。     

奥德赛车发动机起停系统不工作

正故障现象一辆2016年产广汽本田奥德赛车,行驶里程约为1.5万km,因发动机起停系统不工作而进厂检修。此外,据驾驶人反映,仪表上的车外温度信息也无法显示。故障诊断接车后试车验证故障现象,接通点火开关,起动发动机,发动机顺利起动,仪表盘上发动机起停系统指示灯(琥珀色)常亮,仪表上的车外温度信息不显示(图1),发动机起停系统不能正常工作。对车辆进行常规检查,未发现存在加装和改装的情况。     

奥迪A6L间歇性无法起动

正一、故障现象有一辆2014款奥迪A6L轿车,配备2.0T发动机,0AW变速器,行驶里程2.9万km。客户反应车辆行驶中遇红灯停车踩住制动踏板,发动机起停功能起作用,车辆自动熄火。绿灯后,松开制动,正常发动机应立即起动,但只听到起动机连续的起动声,车辆无法着车。连续起动多次,有时能着车。二、故障诊断     

帕萨特B5发动机间歇性熄火

VIN:LSVBCGD22YC017037行驶里程:150807km故障现象:该车自发动机大修后一直行驶正常,但最近开始在低速行驶或怠速工况时发动机偶尔出现瞬间抖动并熄火的故障,近来该故障变得比较明显和频繁,而发动机中、高速工况正常,且在每次熄火后发动机均能立即启动,故障发生没有任何先兆和规律性。     

BJ5030型汽车起动困难故障排除

故障现象：一辆BJ5030ZXXYH1汽车，累计行驶里程7万km。该车发动机熄火一段时间后不易起动，通常需要连续起动5～8次才能成功，有时甚至需要更多次，但发动机起动后备工况均工作正常。     

驾驶循环对车辆能量经济性影响的研究

本文依据国内外具有代表性的不同驾驶循环对一实际的内燃机汽车和一构思的混合动力电动汽车的能量经济性进行了分析。研究了内燃机和电机的运行工况分布，并利用内燃机的万有特性图和电机及其控制系统的等效率曲线以及各驾驶循环的相关特性分析了产不同结果的原因。最后对内燃机汽车和混合动力电动汽车的能量经济性受驾驶循环的影响情况进行了比较和分析。     

点燃式发动机冷起动瞬态排放特性研究

使用瞬态测量仪研究点燃式发动机冷起动瞬态HC排放特性,高速采集系统同步记录发动机缸压、转速及稳态HC排放情况.通过分析可知:冷起动初始几个循环对于后续循环的燃烧稳定性有显著影响;瞬态HC排放可更直接指出有问题的燃烧循环,可为优化燃烧控制策略提供支持.     

P2混合动力汽车发动机起动过程驾驶性研究（英文）

Perfect performance of economy and emissions make hybrid powertrain used more widely, but frequent engine start may affect vehicle's driveability. In order to obtain how to improve hybrid vehicle's driveability, Audi A6 Hybrid which is equipped with a P2 powertrain with two engine start modes: conventional start with a 12 V starter and hybrid start with a high-voltage motor, is evaluated under several driving situations with frequently-used criteria. Test results show Audi A6 Hybrid can gain perfect driveability in all engine start situations. Avoiding to start engine frequently in some special situations, suitable choice of engine start modes, compensating driver's request torque by down-shifting gear or increasing the traction motor torque, and maneuver sequences of K0 clutch are all helpful to obtain perfect driveability for Audi A6 Hybrid.     

基于模糊逻辑控制策略的混合动力汽车仿真研究

以燃油经济性和排放性能为主要控制目标,提出一种基于模糊逻辑的能量分配控制策略,应用ADVISOR仿真软件,对制定的控制策略在不同的道路循环工况下进行仿真。仿真结果表明,所设计的模糊逻辑控制策略能够合理分配发动机和电机的转矩,可使发动机工作在效率较高、排放较低的中等负荷区,整车的燃油经济性较好、排放较低。     

柴油机高压共轨控制系统试验研究

介绍一种对电控高压共轨发动机进行试验研究的基本方法,通过对某高压共轨电控系统进行台架试验,测试发动机转速、扭矩以及凸轮信号、曲轴信号、喷油器电磁阀驱动信号、高压泵PCV阀驱动信号、轨压信号,掌握其主要控制参数。在此基础上自行完成电控单元的设计,并在发动机台架上进行了对比试验,起动、稳定性控制和标定点排放指标都达到原机电控单元控制水平。     

基于工况分析的混合动力系统设计

通过对上海典型城市工况循环的构建与分析得到了目标车型的基本行驶参数,并分析了加减速过程中整车能量消耗、功率消耗的分布情况。对该车混合动力系统控制策略进行了优化,并在ECE+EUDC联合工况下分别以混合动力模式和传统车模式进行了仿真对比。结果表明,以混合动力模式运行时,整车能够及时跟踪期望车速,并且能按预期目标实现发动机托动、怠速停机、加速助力和制动能量回收功能;该动力系统方案下混合动力运行模式比传统运行模式燃油经济性提高12%以上。     

Emission-robust operation of diesel HEV considering transient emissions

In this paper, we consider a method to create an engine emission simulation model for cycle and customer driving of a vehicle. The emission model results from an empiric approach, also taking into account the effects of engine dynamics on emissions. We analysed transient engine emissions in driving cycles and during representative customer driving profiles and created emission meta models. The analysis showed a significantly higher correlation in emissions when simulating realistic customer driving profiles using the created verified meta models (< 1 % model error) compared to static approaches, which are commonly used for vehicle simulation. Therefore, a transient modelling approach is conducted, which shows a great increase in accuracy in customer driving operation.     

Simulation of city bus performance based on actual urban driving cycle in China

This paper establishes the simulation model of a city bus on the basis of the EQ6110 bus prototype and its experimental data. According to the actual urban driving cycle, the fuel economy and the traction performance of the EQ6110 city bus have been simulated, and factors such as the driving cycle, the loss of power to engine accessories, the gear-shifting strategy, the fuel shut-off strategy of the engine, etc., which influence on the bus’s fuel economy, are also quantitatively analyzed. Some conclusions are drawn as follows: (1) driving cycles have a great influence on the fuel economy of a city bus; (2) under the typical urban driving cycle of the public bus in China, the engine fuel shut-off strategy can save about 1 to 1.5 percent of the fuel consumption; and (3) the optimized gear-shifting rules can save 6.7 percent of the fuel consumption. Experimental results verify that the fuel economy for the EQ6110 public bus is improved by 7.2 pecent over the actual Wuhan urban driving cycle of the current public bus in China.     

Examination of PN emissions and size distributions of a hybrid city bus under real world urban driving conditions

Engine load-speed frequency map of a hybrid city bus, which operates on the routes of Sakarya Municipality, was compared with that of European Transient Cycle (ETC) and World Harmonized Transient Cycle (WHTC), which are the certification test cycles. It was observed that the hybrid city bus engine operates mostly at three main regions, which are idling (30% load and 750 rpm), motoring (0% load and 1200 rpm) and high load (80% load and 1800 rpm) conditions under real world urban driving conditions. However, engine load-speed frequency maps of the certification test cycles are significantly different and cannot represent the real world urban driving conditions of the hybrid city bus. Therefore, the Particle Number (PN) emissions of the hybrid city bus were investigated under real world urban driving conditions. The aims of work were to examine the effects of city bus hybridization on the particle emissions and develop PN emission factors. The PN concentrations and size distributions together with engine operating conditions were measured with a Particle Measurement Program (PMP) compliant system, which involves a condensation particle counter (CPC) and a particle sizer (EEPS). The measurements under real world urban driving conditions indicated that the emission factors of the hybrid city bus for the PN and Total PN are 8.99E+12 and 2.51E+13 #/kW-h, respectively. The PN size distribution measurements indicated that the particles up to approximately 20 nm are not very sensitive to changes in engine power and they are exist even during motoring conditions. But, the particles in the size range from 20 to 200 nm are very sensitive to sudden changes of the engine power.     

老化循环对三效催化器的老化效果研究

为研究不同整车驾驶循环对车辆三效催化器热老化的效果差异,选取两辆配备同款发动机的满足国六排放标准的纯汽油车和油电混合动力车,分别进行AMA、SRC、WLTC和典型RDE循环,利用数据采集系统实时采集车辆运行参数和三效催化器床体温度。基于阿伦尼乌斯公式将不同循环16万km耐久性后的热老化程度量化为热损伤,并以RDE循环为参照基准,将不同测试循环行驶16万km换算成对应的实际道路等效行驶里程。研究结果表明:相同循环下,油电混合动力车三效催化器的16万km热老化程度低于纯汽油车;AMA和SRC循环对三效催化器造成的热老化程度明显高于相同行驶里程下的WLTC循环和RDE循环。纯汽油车以AMA循环或SRC循环进行16万km耐久老化,对三效催化器所造成的老化效果相当于在实际道路上行驶了51.84和60.30万km;油电混合动力车以AMA循环和SRC循环进行16万km耐久老化,对三效催化器造成的老化效果相当于在实际道路上行驶30.44和29.21万km。