共查询到17条相似文献,搜索用时 187 毫秒
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<正>在自动变速器的换挡控制中,电磁阀的动作对换挡品质的影响非常大。自动变速器控制单元对电磁阀的输出油压进行线性控制,使自动变速器执行元件柔性接合与释放,从而提高换挡舒适性。对于老款4速自动变速器,如4T65E、CD4E等,通常只有4个电磁阀,其中2个开关(ON/OFF)电磁阀负责换挡,1个PWM(脉冲宽度调节)电磁阀负责液力变矩器的锁止控制,1个PWM电磁阀负责主油 相似文献
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为了使喷油起始点合适和喷油量精确,共轨喷油系统使用了带液压伺服系统和电磁阀的喷油器(图34)。喷油过程开始时,以较高的吸动电流控制电磁阀迅速打开。当针阀达到其最大升程使喷油器全开时,控制电流立即降低到较小的保持电流。喷油量由开启时间和共轨压力决定。当控制电流终止时。电磁阀即关闭,喷油过程也就结束。[第一段] 相似文献
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正Q77E变速器控制电磁阀5是Q8控制电磁阀总成的一部分,没有可维修零件。变速器控制电磁阀5为变力电磁阀。变速器控制模块12V参考电压1电路向变速器控制电磁阀5提供12V电压。变速器控制模块中的低电平侧驱动器电路采用脉冲宽度调制,改变至电磁阀的电流。如果检测到过大电流,则高电平侧驱动器1会断开。当电路故障被修复时,高电平侧驱动器1将复位。有关更详细的操作说明,参见电子部件的说明。 相似文献
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提出了一种新型电控汽油喷油器开启延迟时间在线检测方法,该方法通过分析喷油器的驱动电流波形来检测喷油器开启延迟时间.由于喷油器电磁阀衔铁完全吸合时喷油器才会完全开启,驱动电流在电磁阀衔铁完全吸合时会产生明显的电流拐点.该方法构建一种硬件电路以及检测逻辑,能在驱动电流出现拐点的时刻触发可检测的脉冲.通过分析触发脉冲的延迟时间以及脉宽,可准确得到喷油器开启的延迟时间.该技术不仅可以用于喷油器的出厂检测和日常维修,还可以移植到ECU中,在线检测喷油器的延迟时间,为喷油正时策略提供补偿依据. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4-5):267-284
For the control of anti-lock brake system (ABS), a longitudinal four-wheel vehicle model with brake actuator is described and a sliding mode controller with pulse width modulation (PWM) method has been developed for passenger vehicles. In our research, we introduce actuator dynamics of solenoid-solenoid valve type in system equation and derive the sliding mode control input theoretically. We propose using PWM method to compensate for the discrete nature of actuator dynamics by duty control. The effectiveness of the proposed control algorithms was confirmed by vehicle test on an in-door test bench that was specially constructed for the purpose concerned. 相似文献
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Control of Wheel Slip Ratio Using Sliding Mode Controller with Pulse Width Modulation 总被引:3,自引:0,他引:3
Seongho Choi Dong-Woo Cho 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1999,32(4):267-284
For the control of anti-lock brake system (ABS), a longitudinal four-wheel vehicle model with brake actuator is described and a sliding mode controller with pulse width modulation (PWM) method has been developed for passenger vehicles. In our research, we introduce actuator dynamics of solenoid-solenoid valve type in system equation and derive the sliding mode control input theoretically. We propose using PWM method to compensate for the discrete nature of actuator dynamics by duty control. The effectiveness of the proposed control algorithms was confirmed by vehicle test on an in-door test bench that was specially constructed for the purpose concerned. 相似文献
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Seongho Choi Dong-Woo Cho 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2001,36(1):57-72
For the control of anti-lock brake system (ABS), a longitudinal four-wheel vehicle model with brake actuator is described and a sliding mode controller with pulse width modulation (PWM) method has been developed for passenger vehicles. In our research, we introduced actuator dynamics in the system equation and derived the equivalent control input theoretically. We propose using the PWM method to compensate for the discrete nature of actuator dynamics by duty control. Stability of the PWM controller for sliding mode control (SMC) was theoretically checked. The effectiveness of the proposed control algorithms was confirmed by vehicle tests on an In-door test bench that was specially constructed for the purpose concerned. 相似文献
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