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柴油机高压共轨电控单元的开发 总被引:8,自引:0,他引:8
根据柴油机高压共轨系统的控制要求,开发基于Motorola MPC55532位芯片的电控单元。采用模块化的设计方法开发电控单元硬件,包括电磁阀的驱动电路和电源电路;利用MPC555的TPU3模块功能实现输入和喷射控制,编制控制软件;采用PID模糊控制算法,实现了共轨压力的控制。台架试验结果表明:电控单元(ECU)能满足柴油机高压共轨系统的要求。 相似文献
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分析了峰值电流控制模式下移相全桥变换器的工作原理,设计了电动汽车充电单元的串联双闭环控制器。该控制器外环主回路实时获取负载电压与输入参考电压之间的偏差,通过输入PID电压环对输出电压进行调节,其内环副回路实时计算原边控制电流与PID电压环控制输出的偏差,通过输入PID电流环对控制电流进行调节。针对当控制输入信号占空比大于50%后峰值电流变换器系统出现不稳定的问题,设计了一种斜坡补偿方法,并以PIC16F887单片机为核心,开发了一套电动汽车充电控制单元。实验结果表明,所设计的充电控制单元可以满足电动汽车的充电要求,并具有可靠性高、动态响应快、补偿网络易实现以及带宽增益较高等优点。 相似文献
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以产品化为目标,采用了高性能的微控制器MC68376,运用模块化设计方法,设计了高压共轨柴油机的电控单元的硬件和底层软件。其中硬件包括:MCU、电源、输入输出、通信等模块。软件包括:初始化、采样处理和输出处理等模块。通过柴油机台架试验表明:该控制单元可以对柴油机高压共轨燃油系统进行精确可靠的控制。 相似文献
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基于发动机控制系统中涉及到大量数字逻辑电路的开发,进行了以32位微控制器MCF5233和CPLD为核心构架的共轨式ECU开发。其中,基于CPLD(复杂可编程逻辑器件)完成了数字升压模块的开发和针对喷油器实现了高、低压分时驱动控制;同时,借助于瞬时转速开发了燃油喷射时序和多次喷射控制算法。试验结果表明:新的可灵活调制喷油模式的ECU可以实现任意曲轴角度的喷油定时,在以1 200r/min运行、以3 000r/min/s加速时,最大算法定时误差角度不超过0.033°;同时,利用结构体数组对喷射参数进行定义,仅一次中断服务,即可实现多次喷射模式。其中,多次喷射模式可控制的脉冲数可达到6次以上,且支持不同喷油模式间的自由切换。 相似文献
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In this paper, a new topology of cascaded multilevel inverter using a reduced number of switches, insulated gate driver circuits and voltage standing on switches is proposed. The proposed topology results in reduction of installation area and cost and has simplicity of control system. This structure consists of series connected sub-multilevel inverters blocks. Three algorithms for determination of magnitudes of dc voltage sources have been presented, too. Validity of the analysis has been proved by simulation and experimental results. 相似文献
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From the viewpoint of high quality output voltage generation in a residential photovoltaic system, a multilevel inverter employing cascaded transformers can become a good substitute for the conventional pulse width modulated inverters and other multilevel counterparts. However, to obtain more sinusoidal output voltage waves, it should increase the number of switching devices and transformers resulting in a cost increase. To alleviate this problem, an efficient switching pattern is proposed and applied to a multilevel inverter equipped with two cascaded transformers, which have a series-connected secondary. Operational principle and analysis are illustrated focusing on a change of the switching pattern. High-performance of the proposed multilevel scheme embedded in a photovoltaic power conditioning system is verified by computer-aided simulations and experimental results. 相似文献
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滞环比较PWM跟踪控制分析 总被引:15,自引:0,他引:15
介绍了可再生能源用逆变器的基本要求和滞环比较方式PWM跟踪控制用于可再生能源利用中的两种控制方式。从滞环控制方式的特点入手,详细分析了单相滞环比较控制方式的原理并计算得出了实际的器件开关频率计算式。仿真结果表明,假设合理,分析确切,控制方式简单,动态性能好、谐波小,适于并网及独立运行。 相似文献
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Lately, it is required that the bandwidth of PWM (pulse width modulation) power amplifier is extended. For example, it is in application of the testing power supply of a low frequency immunity examination, or a class-D amplifier. In this paper, the authors show that the bandwidth of PWM power amplifier can be controller. This controller is implemented on a DSP (digital can be made wider with this controller. extended by using an approximate 2DOF (2-degree-of-freedom) digital signal processor). It is demonstrated from experiments that the bandwidth 相似文献
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A fuel cell powered system is regarded as a high current and low voltage source. To boost the output voltage of a fuel cell, a DC/DC converter is employed. Since these two systems show different dynamics, they need to be coordinated to meet the demand of a load. This paper proposes models for the two systems with associated controls, which take into account a PEM fuel cell stack with air supply and thermal systems, and a PWM DC/DC converter. The integrated simulation facilitates optimization of the power control strategy, and analyses of interrelated effects between the electric load and the temperature of cell components. In addition, the results show that the proposed power control can coordinate the two sources with improved dynamics and efficiency at a given dynamic load. 相似文献