共查询到19条相似文献,搜索用时 156 毫秒
1.
液压挖掘机混合动力系统的参数匹配方法 总被引:4,自引:0,他引:4
为了提高液压挖掘机混合动力系统的效率,提出了一种对其动力系统进行优化的参数匹配方法.分析了液压挖掘机混合动力系统的结构、工况及其控制策略,从而确立基于优化目标函数和约束条件函数的参数匹配方法.利用该匹配方法对混合动力系统中发动机、电动机、发电机和电容器等主要元件进行了参数匹配,在所建立的混合动力液压挖掘机模型上对匹配结果进行了分析.结果表明:进行参数匹配后系统的效率有了显著提高,并且主要元件均满足工况的要求. 相似文献
2.
随着我国经济的不断发展和汽车工业技术水平的提高,人们对生活环境提出了更高层次要求,其中混合动力轿车就是一个很好地研究方向.本文介绍几种液压传动系统、燃油发动机控制系统以及电动助力转向系统等.通过对比分析国内外混合动力系统在节能方面应用现状及存在问题;最后针对该课题进行展望并总结出一些自己对于今后工作所做出的意见与建议:... 相似文献
3.
4.
5.
6.
7.
二、混合动力系统控制
混合动力系统的控制对象是驱动力控制、功率变换器(变频器)效能控制、再生制动与液压制动协调控制以及HV蓄电池(以下简称电池)状态管理。这些控制任务都是通过电子控制单元(ECU)来完成。图23为丰田第二代混合动力控制系统。 相似文献
8.
9.
10.
液压混合动力城市客车是以发动机动力与液压动力相混合的新型城市客车,具有节能效率高、减排能力强的优点.由于液压混合动力的结构特点与技术特点,其节能、减排性能的评价指标与评价方式也有其特殊性.本文针对液压混合动力城市客车的特点,探讨了液压混合动力城市客车的节能减排性能评价指标及评价方法. 相似文献
11.
12.
Hybrid vehicles of different configurations and utilizing different energy storage systems have existed in development for many decades and more recently in limited production. They can be grouped as parallel, series or complex hybrids. Another classification is micro, mild and full hybrids which makes the distinction on the basis of functionality. The common energy storage systems in hybrid vehicles are batteries, supercapacitors and high speed flywheels. This paper aims to review a specific type of hybrid vehicle which involves the internal combustion engine (ICE) as the prime mover and the high speed flywheel as an energy storage device. Such hybrids are now attracting considerable interest given their potential for low cost. It is hence timely to produce a review of research and development in this subject. The flywheel is coupled to the drive line with a continuous variable transmission (CVT). The CVT can be of various types such as electrical, hydraulic or mechanical but usually in this case it is a non-electrical one. Different configurations are possible and the paper provides a timeline of the development of such powertrains with various examples. These types of hybrid vehicles have existed as prototypes for many decades and the authors believe that their development has reached levels where they can be considered serious contenders for production vehicles. 相似文献
13.
Combined control of a regenerative braking and antilock braking system for hybrid electric vehicles 总被引:1,自引:0,他引:1
D. Peng Y. Zhang C. -L. Yin J. -W. Zhang 《International Journal of Automotive Technology》2008,9(6):749-757
Most parallel hybrid electric vehicles (HEV) employ both a hydraulic braking system and a regenerative braking system to provide
enhanced braking performance and energy regeneration. A new design of a combined braking control strategy (CBCS) is presented
in this paper. The design is based on a new method of HEV braking torque distribution that makes the hydraulic braking system
work together with the regenerative braking system. The control system meets the requirements of a vehicle longitudinal braking
performance and gets more regenerative energy charge back to the battery. In the described system, a logic threshold control
strategy (LTCS) is developed to adjust the hydraulic braking torque dynamically, and a fuzzy logic control strategy (FCS)
is applied to adjust the regenerative braking torque dynamically. With the control strategy, the hydraulic braking system
and the regenerative braking system work synchronously to assure high regenerative efficiency and good braking performance,
even on roads with a low adhesion coefficient when emergency braking is required. The proposed braking control strategy is
steady and effective, as demonstrated by the experiment and the simulation. 相似文献
14.
15.
Y. -L. Chen S. -A. Liu J. -H. Jiang T. Shang Y. -K. Zhang W. Wei 《International Journal of Automotive Technology》2013,14(1):101-112
A new configuration of hydraulic hybrid vehicle (HHV) was presented, which mainly consists of an engine, high-pressure accumulator, lower-pressure reservoir and hydraulic transformer (HT) connected to common pressure rail (CPR), and the working principle of hydraulic hybrid vehicle has been described to extend its energy-regenerated potential. Moreover, the mathematical models of the instantaneous pressure ratio of HT and the characteristic parameters of parallel and series accumulator (i.e. effective volume, specific energy, and charge-discharge efficiency) based on lumped parameters method were built, respectively. The simulation and experimental tests of dynamic characteristics of HT and accumulator were done, the result shows that the theoretical analysis was the same as the experimental results by comparing them in the curve trend, and the series accumulator was much superior to parallel accumulator in terms of pulsation damping of hydraulic transformer, that is the simulation results reasonably and appropriately. 相似文献
16.
Fengchun Sun Wei Liu Hongqiang Guo 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2016,54(8):1031-1052
For an electric vehicle with independently driven axles, an integrated braking control strategy was proposed to coordinate the regenerative braking and the hydraulic braking. The integrated strategy includes three modes, namely the hybrid composite mode, the parallel composite mode and the pure hydraulic mode. For the hybrid composite mode and the parallel composite mode, the coefficients of distributing the braking force between the hydraulic braking and the two motors' regenerative braking were optimised offline, and the response surfaces related to the driving state parameters were established. Meanwhile, the six-sigma method was applied to deal with the uncertainty problems for reliability. Additionally, the pure hydraulic mode is activated to ensure the braking safety and stability when the predictive failure of the response surfaces occurs. Experimental results under given braking conditions showed that the braking requirements could be well met with high braking stability and energy regeneration rate, and the reliability of the braking strategy was guaranteed on general braking conditions. 相似文献
17.
In this paper, an optimized control strategy is proposed for a split parallel hydraulic hybrid truck. The model of the vehicle was simulated in Simulink. According to a global optimization technique, a fuzzy control strategy is developed for the vehicle. This strategy shows flexibility for different drive cycles and a desirable fuel consumption reduction, especially for a low speed drive cycle, which is extracted according to an urban utility vehicle mission. 相似文献
18.
电子控制液压动力转向技术是通过对传统的液压动力转向器的控制阀进行改造,增加一套通过电子控制的电动旁通阀,根据车速和方向盘的转角,控制进入转向器工作缸的助力油,从而改善车辆在高速时转向器的助力特性。本文主要介绍了电子控制液压助力转向器的组成﹑原理及特点,及其在混合动力客车上应用。 相似文献