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故障现象 一辆04款捷达轿车,配备01M自动变速器,由于某种原因车主将该车改装成手动变速器,自动变速器控制单元空置不用,但换上手动变速器后感觉发动机加速性能变差,车主又要求改装过来,但是将原车的自动变速器换上后自动变速器却一直处于锁挡状态,并且仪表盘上的挡位显示时有时无。 相似文献
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<正>故障现象一辆2006款别克陆尊车,行驶里程约为16.5万km,因自动变速器挡位显示异常而进厂检修。故障诊断接车后,试车验证故障。接通点火开关,发动机无法起动,挡位也锁定在1挡,无法正确显示(图1)。连接故障检测仪,对车辆进行检测,发现故障检测仪无法与自动变速器控制模块(TCM)进行通讯。根据上述检查结果分析可知,该车存在2个方面故障。一是自动变速器挡位显示异常;另一个是故障检测仪与TCM无法通讯。分析可知,造成自动变速器挡位显示异常的可能原因 相似文献
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故障现象一辆2007款福特福克斯1.8 L自动挡轿车,累计行驶里程为2.3万km,在行驶中自动变速器升降挡时均有冲击的现象。故障诊断维修人员首先进行路试,发现当车速达25 km/h~30 km/h时自动变速器1挡升2挡,此时自动变速器有冲击,车辆有抖动的现象;当车速下降到30 km/h时,车辆再次出现抖动的现象;仪表盘上的黄色故障灯点亮,指示自动变速器进入保护模式,自动变速器挡位锁在3挡,发动机转速为3 500 r/min时车速只能达到100 km/h左右。 相似文献
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案例一 故障现象 一辆2010年生产的雪铁龙C5轿车,发动机型号为EW10A,ECU型号为MM6LPB,自动变速器型号为AT8,行驶里程为58670km.该车在使用过程中,突然出现变速杆被锁止在P挡,车辆无法挂挡行驶的故障. 故障诊断与排除 根据C5轿车自动变速器控制原理(图1)可知,变速杆被锁止在P挡的主要原因有:①点火开关不能把点火信号传递到智能控制盒BSI;②1635中的多功能开关有故障,造成不能正确传递P挡信号;③双功能制动开关2120有故障,造成不能正确传递制动信号;④自动变速器ECU损坏,不能控制挡位锁止继电器1 642通电工作;⑤挡位锁止继电器损坏,不能控制P挡锁止电磁阀1603解锁;⑥1603中的P挡锁止电磁阀损坏,不能控制P挡解锁. 相似文献
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<正>2014款奔驰E350 BlueTEC车所搭载的9G-Tronic自动变速器,是一款由奔驰自主研发的纵置9速自动变速器(图1)。该款自动变速器拥有9个前进挡,按照奔驰的习惯,除了9个前进挡外还有2个倒挡,而9个前进挡位中有7 相似文献
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加速行驶车外噪声试验研究及我国载客汽车噪声水平分析 总被引:1,自引:0,他引:1
通过对加速行驶车外噪声源的分析,确定了发动机排气噪声和轮胎滚动噪声是目前汽车加速行驶的主要噪声源。在阐述了我国汽车加速行驶车外噪声的试验方法后,提出驾驶员操作是影响测量结果的最主要因素。结合大量试验测量数据,对比分析了GB1495-2002第二阶段噪声限值实施前后我国汽车加速噪声的变化,建议将加强M3类大型载客汽车的降噪研究工作作为今后我国大中型城市汽车噪声控制的重点。 相似文献
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Meng Li Michael Khonsari Ruzhou Yang 《International Journal of Automotive Technology》2018,19(3):473-488
The torsional vibration generated during clutch engagement directly affects the shifting quality of automatic transmissions, where the noise source stems from both the clutch and the gear set. To predict the dynamical response and driveline oscillation, a comprehensive mathematical model of the vehicle powertrain equipped with automatic transmission is developed with consideration of nonlinearities in the clutch and the planetary gear set. For the clutch, the dynamics of stickslip is described for the transition between the slipping to locked states. The gear backlash model is used to analyze the rattle noise of the planetary gear set. Based on extensive powertrain simulations for the clutch engagement process, the magnitude of vibration propagation in the driveline are predicted to identify the primary factors of noise generation. 相似文献
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Francesco Frendo Giordano Greco Massimo Guiggiani 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2006,44(6):431-447
The steady-state cornering behaviour of rear-wheel drive vehicles fitted with locked differential is critically analysed by means of simple, albeit carefully formulated, vehicle models, which allow for a rigorous theoretical analysis. Results obtained for some classical manoeuvres, with either constant forward speed, steer angle or turning radius, clearly show that, in the case of locked differential, the vehicle cornering behaviour is strongly affected by the manoeuvre. As an important consequence, the handling diagram is not unique and the understeer gradient is no longer dependent only upon the lateral acceleration, as in vehicles equipped with an open differential. Accordingly, this study shows that some typical tools and concepts of vehicle dynamics are indeed inadequate in the case of locked differential. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):405-428
A hybrid hydraulic vehicle (HHV) combines a hydraulic sub-system with the conventional drivetrain in order to improve fuel economy for heavy vehicles. The added hydraulic module manages the storage and release of fluid power necessary to assist the motion of the vehicle. The power collected by a pump/motor (P/M) from the regenerative braking phase is stored in a high-pressure accumulator and then released by the P/M to the driveshaft during the acceleration phase. This technology is effective in significantly improving fuel-economy for heavy-class vehicles with frequent stop-and-go drive schedules. Despite improved fuel economy and higher vehicle acceleration, noise and vibrations are one of the main problems of these vehicles. The dual function P/Ms are the main source of noise and vibration in a HHV. This study investigates the dynamics of a P/M and particularly the profile and frequency-dependence of the dynamic forces generated by a bent-axis P/M unit. To this end, the fluid dynamics side of the problem has been simplified for investigating the system from a dynamics perspective. A mathematical model of a bent axis P/M has been developed to investigate the cause of vibration and noise in HHVs. The forces are calculated in time and frequency domains. The results of this work can be used to study the vibration response of the chassis and to design effective vibration isolation systems for HHVs. 相似文献
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标准 ISO 362-1:2007提出了新的测试限值和方法,但其中试验的加速入线方法尚未明确,给测试机构带来了较高的测试难度。针对此问题,基于理论分析,通过试验建立 Simulink数学模型对 M1型汽车进行研究,考虑距离和起始速度的耦合,对车辆的预加速距离和加速起始车速进行了两种不同加速方法下的预测。经试验验证,符合率为 80%,平均准确度为0.612 km/h,最低误差可达到0.2%,具有较高的准确度。该模型对于标准的执行,降低了试验的准备难度和复杂程度,一定程度填补了标准中对于加速方法的空缺。 相似文献
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48VBSG混合动力系统控制策略开发及试验研究 总被引:5,自引:0,他引:5
传统内燃机结合48V BSG电机的弱混合动力系统是应对未来油耗法规的一种高性价比方案,其节油效果明显、成本低、开发难度小.为研究48V BSG混合动力系统对于现有车辆性能的改善效果,对一台量产SUV进行了改造,在原有的发动机上加装了48V BSG电机系统,实现了加速助力、能量回收、发动机高速起动等混合动力功能.在该车上,对上述混合动力功能的控制策略进行了研究与优化,并进行试验验证.改造前后的N EDC循环测试表明,该系统能够降低燃油消耗9.1%、THC排放34.3%、NMHC排放35.4%、NOx排放60.6%,并能大幅降低车辆起动的振动噪声水平,提升车辆动力性. 相似文献