Measurement and performance analysis of switch signal for automotive electrical acceleration pedal
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摘要: 设计了基于非接触式电子油门踏板角位移传感器的测试系统, 研究了踩踏速度与采样频率对怠速开关信号输出特性的影响。采用ADLink-PCI911DG数椐采集卡和PCI-DAQ虚拟仪器技术, 将油门踏板角位移传感器信号经A/D转换, 然后通过DAQ驱动程序, 结合LabVIEW软件开发平台, 编写了测试程序, 实现了全自动数据采样。同时进行了油门踏板的快踩快放、慢踩慢放、快踩慢放和慢踩快放等工况试验, 分析了影响电子油门踏板开关信号的关键因素。分析结果表明: 踩踏速度和采样频率是影响信号测量精度的主要因素, 为了保证测量精度, 系统的采样频率应不小于1 000 Hz; 快踩快放时怠速开关信号的误差值最大, 慢踩慢放的误差最小, 由此提出了误差产生原因及解决措施。Abstract: A test system of automotive electrical acceleration pedal was designed based on non-contact angle replacement sensor and the output characteristics of idle switch due to stampeding speeds and sampling frequencies. With ADLink-PCI911DG acquisition card, PCI-DAQ virtual instrument technology and LabVIEW software, the angle sensor signal was transferred by A/D, was driven by DAQ, and the data acquisition was realized automatically. The key factors that affected the switch signal of electrical acceleration pedal were analyzed under fast press and fast release, fast press and slow release, slow press and fast release, slow press and slow release.The result shows that the speeds and frequencies are main influence factors, and the sampling frequencies are not less than 1 000 Hz to ensure measuring precision. The measuring errors are minimal under slow press and slow release, and the errors are maximal under fast press and fast release. Based on the result, some error reasons and solving measures are proposed.
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表 1 高频采样试验开关点电压
Table 1. Switch voltages in high sampling frequency experiment
mV 工况 采样频率/Hz 8 000 5 000 2 000 1 000 开关点1 开关点2 开关点1 开关点2 开关点1 开关点2 开关点1 开关点2 快踩快放 714.4 711.8 721.7 711.5 716.7 715.4 723.6 721.9 慢踩快放 718.3 716.4 717.6 715.5 717.6 716.9 715.6 714.3 快踩慢放 719.4 717.2 717.6 712.9 717.3 713.5 716.1 715.4 慢踩慢放 717.6 716.6 717.8 712.8 713.2 714.6 718.6 716.2 
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表 2 低频采样试验开关点电压
Table 2. Switch voltages in low sampling frequency experiment
mV 工况 采样频率/Hz 900 800 500 300 开关点1 开关点2 开关点1 开关点2 开关点1 开关点2 开关点1 开关点2 快踩快放 726.4 732.6 720.7 743.1 721.4 739.3 704.1 780.1 732.5 713.4 714.3 723.6 764.6 712.9 727.0 879.2 725.9 746.1 732.1 722.6 782.2 772.4 722.8 841.2 慢踩快放 717.2 743.1 746.2 722.3 710.5 793.6 711.5 831.6 720.6 750.3 726.1 732.8 753.1 723.4 716.3 767.4 715.9 726.6 732.6 754.3 743.2 783.5 718.3 839.3 快踩慢放 738.7 724.9 747.1 721.3 782.7 746.3 724.1 720.7 704.8 726.1 735.1 722.1 746.3 735.8 724.1 721.3 717.9 738.5 733.2 715.3 763.4 730.8 719.8 721.4 慢踩慢放 716.2 721.7 736.8 738.7 736.9 743.3 711.6 725.8 718.6 713.8 732.3 748.1 713.4 746.7 716.5 716.8 725.4 721.7 715.3 736.6 719.4 722.1 712.4 729.8
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