摘要
为提高高压共轨系统常用的转子式高压供油泵峰值扭矩的计算准确性,提出一种凸轮轴全周期扭矩计算方法。计算包含柱塞的液压力、摩擦力、弹簧力和惯性力,根据座圈所受的合力方向,在偏心轮坐标系中确定座圈与偏心轮接触点的位置,并通过坐标变换,得到凸轮轴坐标系下该接触点的坐标,进而计算出不同转角下的凸轮轴扭矩。当只考虑柱塞所受的液压力时,该方法与常用的流量倒推法计算结果相同。计算结果表明,高压供油泵的峰值扭矩可按流量倒推法结果的1.3倍计算;当理论排量和供油压力一定时,峰值扭矩随柱塞直径的增大小幅增大、随着柱塞个数的增多而降低,但柱塞数超过3时,数量增多对峰值扭矩降低的效果减弱。
In order to improve the peak torque computation accuracy of the rotary high-pressure fuel pump commonly used in a common rail system,a calculation method for whole cycle camshaft torque was proposed.The hydraulic pressure,friction force,spring force and inertia force effected on a plunger were calculated.According to the direction of resultant force on the triangular ring,the location of contact point between the triangular ring and the eccentric wheel was confirmed with the eccentric wheel coordinate system.Through coordinate transformation,the coordinates of contact points in the camshaft coordinate system were obtained,and then the camshaft torque at any rotation angle was worked out.When only the hydraulic pressure acted on the plunger is taken into account,the calculation result is the same as the backward flow induction as is the common case.The results show that the peak torque of the high-pressure fuel pump can be regarded as 1.3 times the flow backward induction.When the theoretical fuel delivery and the fuel pressure are constant,the peak torque increases slightly with the increase of the plunger diameter and decreases with the increase of the number of plungers.But the effect of the increased quantity of peak torque reduction is reduced when the number of plunge pistons exceeds 3.
作者
杨显锋
王敏
武文佳
姜伟
李汝宁
YANG Xianfeng;WANG Min;WU Wenjia;JIANG Wei;LI Runing(China North Engine Research Institute(Tianjin),Tianjin 300400,China;College of Automobile and Rail Transit,Tianjin Sino-German University of Applied Sciences,Tianjin 300350,China;College of Automobile and Transportation,Tianjin University of Technology and Education,Tianjin 300222,China)
出处
《机械科学与技术》
CSCD
北大核心
2021年第9期1378-1384,共7页
Mechanical Science and Technology for Aerospace Engineering
关键词
高压共轨
转子式高压供油泵
全周期扭矩
峰值扭矩
high-pressure common rail
rotary high-pressure fuel pump
whole cycle camshaft torque
peak torque
作者简介
杨显锋(1987−),助理研究员,硕士,研究方向为柴油机高压共轨系统,yang_xianfeng@163.com。
