共查询到18条相似文献,搜索用时 281 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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本文提出了一种电磁阀的精确控制方法。这种方法采用了磁平衡式霍尔电流传感器作为电流取样元件,并采用直接电流比较法用于一通用电磁阀测试系统。应用表明,基于以上方法的电磁阀驱动电流发生器具有电流控制精度高、动态响应快、性能稳定等优点,能准确产生各种电流波形,适用于各种快慢开关电磁阀和比例电磁阀的精确控制。 相似文献
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4T65-E自动变速器是横置前驱全电子控制带有超速挡的四前进挡自动变速器,由PCM控制2个换挡电磁阀来实现4个前进挡。PCM利用PC电磁阀来调节系统油压,利用PWM电磁阀来控制发动机与自动变速器之间的连接。 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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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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《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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Design of a hydraulic anti-lock braking modulator and an intelligent brake pressure controller for a light motorcycle 总被引:1,自引:0,他引:1
C-Y Lu M-C Shih 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2005,43(3):217-232
The object of this paper is to design a new hydraulic modulator and an intelligent sliding mode pulse width modulation (PWM) brake pressure controller for an anti-lock braking system, for application to light motorcycles. The paper presents a design principle and a mathematical analysis of the hydraulic anti-lock braking modulator. The intelligent sliding mode PWM brake pressure controller based on vehicle acceleration is designed and tested. A three-phase pavement experiment and a rear brake influence test are undertaken to verify the performance of the controller and the modulator. A light motorcycle is built for the real vehicle anti-lock braking experiments. The experimental results show that both the intelligent controller and the hydraulic modulator designed in the study perform well in the anti-lock braking operation. 相似文献
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利用混合燃料比例实时优化的燃料设计思想,提出了一种能够快速调节柴油-二甲醚混合比的在线混合方式,对该系统中的电控喷油器进行了PWM驱动方式试验和分析,试验表明,提高驱动电压可以提高该电控喷油器的响应速度,开启脉宽和PWM占空比决定了开启阶段和维持阶段电流的大小,并通过试验得到了适合该喷油器的理想驱动电流波形.应用该驱动... 相似文献