共查询到19条相似文献,搜索用时 265 毫秒
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介绍了一种点火与燃油喷射相结合的电控汽油喷射系统及其点火子系统、喷油子系统、电控单元的结构及工作原理,并阐述了该系统的主要优点。论述了在冷起动工况、暖车工况、加速工况、全负荷工况以及怠速工况时,系统的点火控制功能和混合气匹配情况。 相似文献
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介绍了一种点火与燃油喷射相结合的电控汽油喷射系统及其点子系统,喷油子系统,电控单元的结构及工作原理,并阐述了该系统的主要优点,论述了在冷起动工况,暖车工况,加速工况,全负荷工况以及怠速工况时,系统的点火控制功能和混合气匹配情况。 相似文献
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中华1.8T轿车发动机采用电控多点顺序燃油喷射系统,发动机电控单元单元(ECU)除了对发动机的喷油、点火、进气及相应的机构进行精确地控制外,电子控制汽油喷射系统通过ECU中的控制程序,还能实现起动加浓、暖机加浓、加速加浓、全负荷加浓、减速调稀、强制怠速断油、自动怠速控制等功能,满足发动机特殊工况对混合气的要求,使发动机获得良好的燃料经济性和排放性。 相似文献
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怠速工况下,电控单元根据节气门位置传感器的怠速触点信号或节气门位置初始信号(三线式不带触点信号)来决定是否为怠速控制。若怠速信号成立,电控单元便依据发动机内存的标准数据进行对怠速执行器控制,调节怠速工况下的进气量,使发动机的实际转速控制在目标转速规定的范围内,即完成怠速稳速控制之目的。怠速工况的稳速控制实质上是怠速工况的进气量的调节控制。怠速转速偏高故障,从根本上讲是怠速工况进气量过大而且过大的进气量是经过空气计量的,从而喷油量也是随之增加的,也就是说,实际进入发动机的混合气空燃比没有变化,而混合气的量值在增大,故使汽缸内的燃烧动力增强,而导致怠速转速升高。按正常怠速控制理论来分析,由于有怠速执行器的控制是不应该有多余的气体进入,即使有某种原因有多余气体进入,怠速执行器根据目标转速要减小怠速通道的进气量来达到稳速目的。那么,为什么还会有怠速偏高故障呢?为什么会有多余的气体不被控制而流入呢?这些多余气体又是如何被测量的呢?对此,我们将从两个主要方面来分析。 相似文献
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东南菱绅轿车在更换蓄电池后,发动机要进行怠速自学习。因为发动机在断电后,其电控单元失去了对怠速电动机各工况下步数的记忆,再次起动发动机时其怠速转速会过低,甚至会熄火。 相似文献
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D. B. Jung S. W. Cho S. J. Park K. D. Min 《International Journal of Automotive Technology》2016,17(2):339-346
A modified thermostatic control strategy is applied to the powertrain control of a parallel mild hybrid electric vehicle (HEV) to improve fuel economy. This strategy can improve the fuel economy of a parallel mild HEV by operating internal combustion engine (ICE) in a high-efficiency region. Thus, in this study, experiments of a parallel mild HEV were conducted to analyze the characteristics of the hybrid electric powertrain and a numerical model is developed for the vehicle. Based on the results, the thermostatic control strategy was modified and applied to the vehicle model. Also, battery protection logic by using electrochemical battery model is applied because the active usage of battery by thermostatic control strategy can damage the battery. The simulation results of the vehicle under urban driving conditions show that the thermostatic control strategy can improve the vehicle’s fuel economy by 3.7 % compared with that of the conventional strategy. The results also suggest that the trade-off between the fuel economy improvement by efficient ICE operation and the battery life reduction by active battery usage should be carefully investigated when a thermostatic control strategy is applied to a parallel mild HEV. 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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Analysis of a regenerative braking system for Hybrid Electric Vehicles using an Electro-Mechanical Brake 总被引:3,自引:0,他引:3
J. K. Ahn K. H. Jung D. H. Kim H. B. Jin H. S. Kim S. H. Hwang 《International Journal of Automotive Technology》2009,10(2):229-234
The regenerative braking system of the Hybrid Electric Vehicle (HEV) is a key technology that can improve fuel efficiency
by 20∼50%, depending on motor size. In the regenerative braking system, the electronically controlled brake subsystem that
directs the braking forces into four wheels independently is indispensable. This technology is currently found in the Electronic
Stability Program (ESP) and in Vehicle Dynamic Control (VDC). As braking technologies progress toward brake-by-wire systems,
the development of Electro-Mechanical Brake (EMB) systems will be very important in the improvement of both fuel consumption
and vehicle safety. This paper investigates the modeling and simulation of EMB systems for HEVs. The HEV powertrain was modeled
to include the internal combustion engine, electric motor, battery and transmission. The performance simulation for the regenerative
braking system of the HEV was performed using MATLAB/Simulink. The control performance of the EMB system was evaluated via
the simulation of the regenerative braking of the HEV during various driving conditions. 相似文献
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J. S. Kim S. M. Kim J. H. Jeong S. C. Jeong J. W. Lee 《International Journal of Automotive Technology》2016,17(5):865-872
In recent years, a hybrid electric vehicle (HEV) has been considered a successful technology. Especially, in case of a full HEV, the motor can drive the vehicle by itself at low velocity or assist the engine at high load. To improve the hybrid electric vehicle’s efficiency, a regenerative braking system is also applied to recover from kinetic energy. In this study, an experimental control apparatus was set up with a parallel hybrid electric vehicle mounted on a chassis dynamometer to measure ECU (engine control unit) and MCU (motor control unit) signals, including the current and state of charge in the battery. In order to analyze regenerative braking characteristics, user define braking driving cycle was introduced and carried out using different initial velocities and braking times. The FTP 75 driving cycle was then adapted under different initial SOC (state of charge) levels. The experiment data was analyzed in accordance with the vehicle velocity, battery current, instant SOC level, motor RPM, engine RPM, and then vehicle driving mode was decided. In case of braking driving cycle, it was observed that SOC were increased up to 1.5 % when the braking time and the velocidy were 6 second and 60 km/h, respectively. In addition, using the FTP 75 driving cycle, mode 1 was most frequently operated at SOC 65 conditions in phase 1. In phase 2, due to frequent stop-go hills, percentage of mode 1 was increase by 22 %. Eventually, despite of identity, it was shown that the characteristics of phase 3 differed from phase 1 due to the evanishment of the effects of initial SOCs. 相似文献