机床与液压
機床與液壓
궤상여액압
MACHINE TOOL & HYDRAULICS
2014年
19期
131-135
,共5页
江浩斌%周泽磊%钱洋%刘海%徐玉琪
江浩斌%週澤磊%錢洋%劉海%徐玉琪
강호빈%주택뢰%전양%류해%서옥기
车辆电控液压转向系统%比例阀%开度控制%模糊PID
車輛電控液壓轉嚮繫統%比例閥%開度控製%模糊PID
차량전공액압전향계통%비례벌%개도공제%모호PID
ECHPS%Proportional valve%Opening control%Fuzzy PID
为了使车辆电控液压转向系统(ECHPS)具有良好的随车速可变的助力特性,研究了用于控制ECHPS旁通流量的比例电磁阀的开度控制策略。分析了旁通流量控制式ECHPS的基本原理和比例电磁阀的结构组成,建立了比例电磁阀的动力学模型和控制模型。针对动态多工况ECHPS旁通流量的精确稳定控制要求,提出了模糊PID控制策略,把模糊推理运用于PID参数的整定,以补偿控制系统因非线性和时变性所导致的误差。仿真结果表明:在低、中、高3种车速工况下ECHPS的旁通流量和比例电磁阀开度的响应符合随车速可变助力特性的要求;与常规PID控制相比,所设计的模糊PID控制具有响应速度快、稳态精度好、超调量小的优点,可实现比例电磁阀开度的精确稳定控制。
為瞭使車輛電控液壓轉嚮繫統(ECHPS)具有良好的隨車速可變的助力特性,研究瞭用于控製ECHPS徬通流量的比例電磁閥的開度控製策略。分析瞭徬通流量控製式ECHPS的基本原理和比例電磁閥的結構組成,建立瞭比例電磁閥的動力學模型和控製模型。針對動態多工況ECHPS徬通流量的精確穩定控製要求,提齣瞭模糊PID控製策略,把模糊推理運用于PID參數的整定,以補償控製繫統因非線性和時變性所導緻的誤差。倣真結果錶明:在低、中、高3種車速工況下ECHPS的徬通流量和比例電磁閥開度的響應符閤隨車速可變助力特性的要求;與常規PID控製相比,所設計的模糊PID控製具有響應速度快、穩態精度好、超調量小的優點,可實現比例電磁閥開度的精確穩定控製。
위료사차량전공액압전향계통(ECHPS)구유량호적수차속가변적조력특성,연구료용우공제ECHPS방통류량적비례전자벌적개도공제책략。분석료방통류량공제식ECHPS적기본원리화비례전자벌적결구조성,건립료비례전자벌적동역학모형화공제모형。침대동태다공황ECHPS방통류량적정학은정공제요구,제출료모호PID공제책략,파모호추리운용우PID삼수적정정,이보상공제계통인비선성화시변성소도치적오차。방진결과표명:재저、중、고3충차속공황하ECHPS적방통류량화비례전자벌개도적향응부합수차속가변조력특성적요구;여상규PID공제상비,소설계적모호PID공제구유향응속도쾌、은태정도호、초조량소적우점,가실현비례전자벌개도적정학은정공제。
In order to have good alterable assist characteristics with speed on vehicle electrical controlled hydraulic power steer-ing system (ECHPS),the opening control strategy for bypass flow proportional valve of ECHPS was studied. The basic principle and structural form of bypass flow controlled ECHPS were analyzed,and the dynamics and control models of proportional valve were estab-lished. Aimed at the requirements of control the bypass flow of ECHPS on dynamic multi-mode conditions accurately and stably,a fuzzy PID control strategy was proposed. The fuzzy reasoning was applied to self-tuning of the PID parameters to compensate the error caused by the nonlinearity and time-variation of the control system. The results of simulation show that,the bypass flow of ECHPS and the o-pening response of proportional valve at low,medium and high speed conditions were comply with the request for alterable assist char-acteristics with speed. As compared with the conventional PID control,the designed fuzzy PID control has advantages of less overshoot, higher steady-state accuracy and rapid response,which can realize the opening control of proportional valve accurately and stably.