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故障现象:一辆C A1121J型柴油汽车装配C A6110型柴油机。该机在怠速工况下,气缸内发出一种清脆的金属敲击声,且发动机排气管冒黑烟。但随着转速逐渐提高至中速,气缸内的敲击声消失,发动机工作正常。故障检查:在发动机怠速工况下做逐缸断油检查。当切断第5缸供油时,金属敲击声消失。在怠速工况下测量该机各缸供油量,发现第5缸的供油量比其它缸都大。于是对喷油泵进行检查,发现喷油泵的喷油量控制齿条拉动时,第1、2、3、4、6等缸的扇形齿轮、旋转套筒、柱塞均同步转动,唯有第5缸旋转套筒及柱塞不能转动。进一步检查,发现第5缸扇形齿轮在旋转… 相似文献
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柴油机发动机与汽油发动机相比,工作时声响和振动较大,这给判断发动机某缸是否工作正常增加了难度。根据教学实践笔者发现在发动机怠速运转时,可采用如下方法迅速查清故障缸。1.感温法:发动机在启动的最初阶段,用手指或测温器判断或测量各缸排气支管的温度,正常的情况下各缸的温度应基本一致。若发现某缸排气支管的温度明显高于其它缸,说明该缸供油量偏大;反之,若温 相似文献
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喷油泵是柴油机燃油供给系统的重要部件,一般在试验台上调整供油量后装机使用,即便这样有时也会出现功率不足、排气冒黑烟、转速不稳的异常情况。主要是由于喷油泵调试的供油量与实际进缸的油量不符或各缸供油量不均匀引起的,直接影响柴油机的动力性、经济性和可靠性。1喷油泵供油不均匀的原因1.1调试状态与使用条件的不同喷油泵在试验台上是在常温下进行调试的,而装机使用则是在汽缸压缩终了、缸内温度达500~700℃、压力3~5MPa条件下使用,两者差别较大。机车作业时,喷油泵与喷油器的温度均达90℃左右,也会造成柴油粘度下降,因而柱塞与针阀偶件的 相似文献
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简要介绍了车用柴油机 12HTД40C型喷油泵的结构和性能 ,并对该泵各缸供油间隔角、供油量、调速器、正负校正装置的检查和调整作了论述。 相似文献
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一、柴油发动机的临界转速就是当柴油发动机在高转速时.立即将喷油泵的操纵臂置于怠速位置(即操纵臂与怠速调螺钉相遇).当柴油机发动机转速降低到某一转速供给柴油时.柴油发动机能够恢复工作然而低于这个转速供油时.柴油发动机就不会恢复工作。此时的转速就是柴油发动机的临界转速。 相似文献
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简要介绍了车用柴油机12HTД40C型喷油泵的结构和性能,并对该泵各缸供油间隔角,供油量,调速器,正负校正装置的检修和调整作了论述。 相似文献
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郑训 《筑路机械与施工机械化》1989,(1)
目前,我国的汽车及工程机械制造与维修行业,对柴油机供油装置的循环供油量大小、各缸循环供油量均匀性、供油提前角大小、各缸供油提前角一致性的调试都非常重视。然而,却遗漏了柱塞预行程这一技术参数的调试与检验。众所周知:“正常供油”的含义,除油量多少、供油持续时间长短、油压高低等符合要求外,还包括供油提前角是否合适和供油规律 相似文献
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<正> 国营吉林柴油机厂于81年5月和汽车研究所合作,开始为缸径110毫米的六缸车用柴油机研制A型系列六缸柱塞式喷油泵。 81年末制成样泵提供给汽车研究所,与6110型柴油机配套试验。这批油泵由于调速器中飞块结构的毛病,在其向外张开时受阻,致使喷油泵出现了供油齿杆伸出量达不到设计要求和怠速油量调节不准等故障。 经过深入试验研究改进,于82年4月又装出一批油泵,经调试达到设计要求,其性能曲 相似文献
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丰田 皇冠3.0轿车装用2JZ-GE型发动机,采用的是多点电子控制燃油喷射系统。该系统主要由进气系统,供油系统、电子控制单元三部分组成。介绍了怠速的组成及工作原理;怠速转速的检查与调整及怠速混合气的调整。 相似文献
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P. V. Manivannan M. Singaperumal A. Ramesh 《International Journal of Automotive Technology》2011,12(1):11-20
An idle speed engine model has been proposed and applied for the development of an idle speed controller for a 125 cc two
wheeler spark ignition engine. The procedure uses the measured Indicated Mean Effective Pressure (IMEP) at different speeds
at a constant fuel rate and throttle position obtained by varying the spark timing. At idling conditions, IMEP corresponds
to the friction mean effective pressure. A retardation test was conducted to determine the moment of inertia of the engine.
Using these data, a model for simulating the idle speed fluctuations, when there are unknown torque disturbances, was developed.
This model was successfully applied to the development of a closed loop idle speed controller based on spark timing. The controller
was then implemented on a dSPACE Micro Autobox on the actual engine. The Proportional Derivative Integral (PID) controller
parameters obtained from the model were found to match fairly well with the experimental values, indicating the usefulness
of the developed idle speed model. Finally, the optimized idle speed control algorithm was embedded in and successfully demonstrated
with an in-house built, low cost engine management system (EMS) specifically designed for two-wheeler applications. 相似文献
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Bin Yang Wu Qiang Zhan Shun Kai Zhang Xiao Kun Nie Yu Han Li Wanhua Su 《International Journal of Automotive Technology》2018,19(4):623-633
Experiments and simulations were used to investigate the effect of a range of engine operating parameters and fuel characteristics on the particle size and particle number (PN) concentration at low speed and idle speed condition. The occurrence, size, and concentration of particles were tested against a range of parameters including start of injection (SOI), common rail pressure, exhaust gas recirculation (EGR) ratio and load. The results showed that the homogeneity of the mixture had the greatest impact on particle size and number concentration. The performance of particle is different at different levels of load. The particle were of nucleation mode at idle condition, and the cold idle particles had a slightly larger diameter than those produced at hot idle. By using the diesel and under high load, at EGR ratios of less than 20 %, most particles were of nucleation mode. At EGR ratios exceeding 20 %, nucleation-mode particles were gradually replaced by accumulation-mode particles. At EGR ratios above 30 %, most particles were of the accumulation mode. Under the same load, gasoline compression ignition produced particles of smaller size and reduced particulate mass (PM). The use of gasoline extended ignition delay, as the high volatility and octane number of the fuel improved the homogeneity of the mixture. Finally, a linear relationship was found between PM and PN. The relative contribution of the different factors to the formation of nucleationor accumulation-mode particles was investigated. 相似文献
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为了研究不同供油压力下单体泵的建压过程及单体泵性能呈现出的变化规律,在电控单体泵试验台上进行了油泵台架试验,获得了高转速工况下不同供油压力的单体泵油压特性曲线。分析了供油压力与单体泵喷油压力之间的关系,并研究了电控单体泵空转时供油压力对单体泵性能的影响。结果表明:高转速时,供油压力低,油压建立过程存在无规律波动;高转速时,一定范围内,供油压力越大,油压上升时刻越早;不同转速对应着不同的临界充油压力,当供油压力大于等于临界压力时,单体泵才能够稳定而有规律地建压;相同工况下,一定范围内,供油压力越大,单体泵喷油量越大。 相似文献