本文对变推力液体火箭发动机的脉宽采样数字控制系统进行了理论分析和实验研究。文中提出了此类控制系统的时宽输入模型,讨论了系统的稳定边界和无波纹响应条件,指出了影响动静态响应的关键因素及其与一般比例反馈控制的区别,并分析了发动机试车时动态特性随工况大幅变化的原因。 In this paper, the theoretical analysis and experimental research on pulse width sampling digital control system of variable thrust liquid propellant rocket engine are carried out. The time-width input model of such control system is proposed in this paper. The stability boundary and non-ripple response conditions of the system are discussed. The key factors that affect the dynamic and static responses are pointed out. The differences between them and the general proportional feedback control are analyzed. Reason for the dramatic change of dynamic characteristics with working conditions.