可变凸轮正时系统的功能性测试

Functional testing on variable cam timing system

为了验证所设计的可变凸轮正时系统(Variable Cam Timing,VCT)是否与新开发的发动机相匹配,确保液压调相器的功能以及可靠性(包括液压调相器的响应速度、控制稳定性以及VCT系统对整个发动机系统的影响),基于发动机试验系统搭建了VCT系统的试验台架,并研究了可变凸轮正时系统如何与发动机匹配选择的测试方法,给出了液压调相器的调节速度测试方法。最后,通过实际VCT系统的功能性测试试验,分析了进、排气液压调相器的调节速度试验结果。

Toverify the matching between the variable cam timing(VCT)system and newly-designed engine,the functionality and reliability of hydraulic modulator,including response speed,control stability and impact of VCT system on engine system,are first ensured.Then,aVCT system testing bench is established based on engine testing system.Next,a testing method for matching selection is proposed to develop the governing and control precision methods for hydraulic modulator.Finally,through the practical functionality testing on VCT system,the governing and control precision testing results are analyzed on intake and exhaust hydraulic modulator.